CN108318061B - Liquid crystal sensor and detection method thereof - Google Patents
Liquid crystal sensor and detection method thereof Download PDFInfo
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- CN108318061B CN108318061B CN201810012236.5A CN201810012236A CN108318061B CN 108318061 B CN108318061 B CN 108318061B CN 201810012236 A CN201810012236 A CN 201810012236A CN 108318061 B CN108318061 B CN 108318061B
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- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
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Abstract
The invention provides a liquid crystal sensor and a detection method thereof, and belongs to the technical field of sensors. Wherein, liquid crystal sensor includes: a solute liquid crystal layer; a hydrophilic-hydrophobic switching film covering the solute liquid crystal layer, the surface of the hydrophilic-hydrophobic switching film facing the solute liquid crystal layer being switchable between a hydrophilic state and a hydrophobic state under preset reaction conditions. The detection method of the liquid crystal sensor comprises the following steps: placing the liquid crystal sensor under a reaction condition to be detected; and emitting a detection light beam from one side of the liquid crystal sensor, detecting the emitted light beam from the other side of the liquid crystal sensor, and judging whether the liquid crystal sensor is placed under a preset reaction condition or not according to a detection result. The invention can reduce the thickness of the liquid crystal sensor, and the liquid crystal in the liquid crystal sensor can be reused, thereby reducing the cost of the liquid crystal sensor, and the liquid crystal sensor is suitable for various detection objects.
Description
Technical Field
The invention relates to the technical field of sensors, in particular to a liquid crystal sensor and a detection method thereof.
Background
The principle of the liquid crystal sensor is that various detection objects are utilized to influence the deflection of liquid crystal molecules, so that the light refracting capacity of the liquid crystal sensor is changed, and the detection of temperature, optics, biomolecules, proteins, harmful chemical substances, pH value, electric field and the like is realized by comparing light beams before passing through the liquid crystal sensor with light beams after passing through the liquid crystal sensor.
The existing liquid crystal sensor has the following defects: the liquid crystal quantity required by detection is large, and the thickness of the liquid crystal sensor is large; for contact detection, the liquid crystal is polluted after detection and cannot be reused; and for different detection objects, the liquid crystal detection modes are different, so that the detection equipment is different, different equipment needs to be replaced for detecting different objects, and the universality is poor.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a liquid crystal sensor and a detection method thereof, which can reduce the thickness of the liquid crystal sensor, and the liquid crystal in the liquid crystal sensor can be reused, thereby reducing the cost of the liquid crystal sensor, and the liquid crystal sensor is suitable for various detection objects.
To solve the above technical problem, embodiments of the present invention provide the following technical solutions:
in one aspect, there is provided a liquid crystal sensor including:
a solute liquid crystal layer;
a hydrophilic-hydrophobic switching film covering the solute liquid crystal layer, the surface of the hydrophilic-hydrophobic switching film facing the solute liquid crystal layer being switchable between a hydrophilic state and a hydrophobic state under preset reaction conditions.
Further, the preset reaction conditions include at least one of: receiving light, contacting with liquid with preset PH value, at preset temperature, contacting with preset biological molecules, contacting with preset chemical materials, and under the action of electric field.
Further, the liquid crystal sensor further includes:
hold the transparent holding tank of solute liquid crystal layer, the holding tank has an opening, hydrophilic hydrophobic switching film is located the opening part, with the solute liquid crystal layer contacts.
Further, the solute liquid crystal layer has a thickness of 0.5 to 1 micron.
Further, under the initial state, the hydrophilic-hydrophobic switching film and the surface that the solute liquid crystal layer contacts are in a hydrophobic state, the orientation direction of the solute liquid crystal layer is irregular, through the preset reaction condition, the hydrophilic-hydrophobic switching film and the surface that the solute liquid crystal layer contacts are in a hydrophilic state, and the orientation direction of the solute liquid crystal layer is regular.
The embodiment of the invention also provides a detection method of the liquid crystal sensor, which comprises the following steps:
placing the liquid crystal sensor under a reaction condition to be detected;
and emitting a detection light beam from one side of the liquid crystal sensor, detecting the emitted light beam from the other side of the liquid crystal sensor, and judging whether the liquid crystal sensor is placed under a preset reaction condition or not according to a detection result.
Further, when the liquid crystal display panel is at a preset temperature, the surface of the hydrophilic-hydrophobic switching film, which is in contact with the solute liquid crystal layer, is switched from a hydrophobic state to a hydrophilic state, and the detection method specifically includes:
emitting a detection light beam from one side of the liquid crystal sensor, detecting the emitted light beam from the other side of the liquid crystal sensor, and judging that the orientation direction of the solute liquid crystal layer is irregular according to a detection result;
placing the liquid crystal sensor under a reaction condition to be detected;
emitting a detection light beam from one side of the liquid crystal sensor, detecting the emitted light beam from the other side of the liquid crystal sensor, judging that the orientation direction of the solute liquid crystal layer is regular according to a detection result, and determining that the liquid crystal sensor is at a preset temperature.
Further, after receiving ultraviolet light irradiation, the surface of the hydrophilic-hydrophobic switching film, which is in contact with the solute liquid crystal layer, is switched from a hydrophobic state to a hydrophilic state, and the detection method specifically includes:
emitting a detection light beam from one side of the liquid crystal sensor, detecting the emitted light beam from the other side of the liquid crystal sensor, and judging that the orientation direction of the solute liquid crystal layer is irregular according to a detection result;
placing the liquid crystal sensor under a reaction condition to be detected;
emitting a detection light beam from one side of the liquid crystal sensor, detecting the emitted light beam from the other side of the liquid crystal sensor, judging that the orientation direction of the solute liquid crystal layer is regular according to the detection result, and determining that the liquid crystal sensor is under ultraviolet irradiation.
Further, after the liquid crystal display is subjected to an electric field, the surface of the hydrophilic-hydrophobic switching film, which is in contact with the solute liquid crystal layer, is switched from a hydrophobic state to a hydrophilic state, and the detection method specifically comprises the following steps:
emitting a detection light beam from one side of the liquid crystal sensor, detecting the emitted light beam from the other side of the liquid crystal sensor, and judging that the orientation direction of the solute liquid crystal layer is irregular according to a detection result;
placing the liquid crystal sensor under a reaction condition to be detected;
emitting a detection light beam from one side of the liquid crystal sensor, detecting the emitted light beam from the other side of the liquid crystal sensor, judging that the orientation direction of the solute liquid crystal layer is regular according to the detection result, and determining that the liquid crystal sensor is under the action of an electric field.
Further, after contacting with a liquid with a preset PH value, or contacting with a preset biomolecule, or contacting with a preset chemical material, the surface of the hydrophilic-hydrophobic switching film, which is in contact with the solute liquid crystal layer, is switched from a hydrophobic state to a hydrophilic state, and the detection method specifically comprises the following steps:
emitting a detection light beam from one side of the liquid crystal sensor, detecting the emitted light beam from the other side of the liquid crystal sensor, and judging that the orientation direction of the solute liquid crystal layer is irregular according to a detection result;
contacting the hydrophilic-hydrophobic conversion film with a substance to be detected;
emitting a detection light beam from one side of the liquid crystal sensor, detecting the transmitted light beam from the other side of the liquid crystal sensor, judging that the orientation direction of the solute liquid crystal layer is regular according to a detection result, and determining that the substance to be detected is liquid with a preset PH value or preset biological molecules or preset chemical materials.
The embodiment of the invention has the following beneficial effects:
in the above scheme, the liquid crystal sensor includes solute liquid crystal layer and hydrophilic-hydrophobic switching film, under the preset reaction condition, the surface of hydrophilic-hydrophobic switching film towards the solute liquid crystal layer can be switched between the hydrophilic state and the hydrophobic state, when the surface of hydrophilic-hydrophobic switching film towards the solute liquid crystal layer is in the hydrophilic state, because hydrophilic groups have a large amount of hydroxyl groups, and have strong anchoring energy between the liquid crystal, can make the orientation of the solute liquid crystal layer change, change the ability of liquid crystal sensor refraction light, thereby influence the light path through the solute liquid crystal layer, like this through emitting detection light beam on one side of the liquid crystal sensor, detect the transmitted light beam on the other side of the liquid crystal sensor, can judge whether the liquid crystal sensor is in the preset reaction condition, thereby accomplish the detection to the detection object. The liquid crystal sensor only needs a small amount of liquid crystal which is in contact with the hydrophilic-hydrophobic conversion film, so that the liquid crystal sensor can be made thinner. In addition, when the liquid crystal sensor is used for detection, the solute liquid crystal layer is not contacted with a detection object, so that the solute liquid crystal layer can be repeatedly used, and the cost of the liquid crystal sensor is reduced.
Drawings
FIG. 1 is a schematic diagram of a conventional liquid crystal sensor;
FIG. 2 is a schematic view of a conventional liquid crystal sensor for detection;
FIG. 3 is a schematic diagram of the surface of the hydrophilic-hydrophobic transition thin film in contact with the solute liquid crystal layer in a hydrophobic state according to the embodiment of the present invention;
FIG. 4 is a schematic diagram of the hydrophilic-hydrophobic transition thin film in a hydrophilic state on a surface in contact with the solute liquid crystal layer according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a liquid crystal sensor according to an embodiment of the present invention;
fig. 6 is a schematic diagram of detection by using a liquid crystal sensor according to an embodiment of the present invention.
Reference numerals
1 liquid crystal molecule
2 substance to be detected
3 detecting the light beam
4 hydrophilic group
5 hydrophobic groups
6 hydrophilic-hydrophobic conversion film
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved by the embodiments of the present invention clearer, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, in the conventional liquid crystal sensor, the initial alignment direction of the liquid crystal molecules 1 is irregular, and at this time, the detection beam is emitted from one side of the liquid crystal sensor, and the transmitted beam is received from the other side of the liquid crystal sensor, and since the liquid crystal sensor changes the propagation direction of the detection beam, the beam transmitted through the liquid crystal sensor becomes divergent, and thus the intensity of the received beam is significantly weaker than that of the detection beam.
As shown in fig. 2, after the substance 2 to be detected is dropped into the liquid crystal sensor, the substance 2 to be detected affects the deflection of the liquid crystal molecules, so that the orientation direction of the liquid crystal molecules 1 becomes regular, at this time, the detection light beam 3 is emitted from one side of the liquid crystal sensor, and the emitted light beam is received from the other side of the liquid crystal sensor. Therefore, the detection of substances to be detected, such as biomolecules, proteins and harmful chemical substances, can be realized by comparing the light beams transmitted by the liquid crystal sensor, and the detection of temperature, optics, an electric field, the pH value of liquid and the like can also be realized in the same way.
However, the existing liquid crystal sensor has the following disadvantages: 1. the liquid crystal quantity required for detection is large, so that the thickness of the liquid crystal sensor is large; 2. when the liquid crystal sensor is used for contact detection, liquid crystal contacted with a substance to be detected is polluted and cannot be reused, so that the cost of the liquid crystal sensor is high; 3. different detection objects are detected by different liquid crystal sensors, and the method is lack of commonality.
In order to solve the above problems, embodiments of the present invention provide a liquid crystal sensor and a detection method thereof, which can reduce the thickness of the liquid crystal sensor, and the liquid crystal in the liquid crystal sensor can be reused, thereby reducing the cost of the liquid crystal sensor, and the liquid crystal sensor is suitable for various detection objects.
An embodiment of the present invention provides a liquid crystal sensor including:
a solute liquid crystal layer;
a hydrophilic-hydrophobic switching film covering the solute liquid crystal layer, the surface of the hydrophilic-hydrophobic switching film facing the solute liquid crystal layer being switchable between a hydrophilic state and a hydrophobic state under preset reaction conditions.
In this embodiment, the liquid crystal sensor includes solute liquid crystal layer and hydrophilic-hydrophobic switching film, under the reaction condition of predetermineeing, the surface of hydrophilic-hydrophobic switching film towards solute liquid crystal layer can be switched between hydrophilic state and hydrophobic state, when the surface of hydrophilic-hydrophobic switching film towards solute liquid crystal layer is in hydrophilic state, because hydrophilic group has a large amount of hydroxyls, and have stronger anchor energy between the liquid crystal, can make the orientation of solute liquid crystal layer produce the change, change the ability of liquid crystal sensor refraction light, thereby influence the light path through solute liquid crystal layer, like this through the measuring beam of launching on one side of the liquid crystal sensor, detect the transmitted light beam on the liquid crystal sensor opposite side, can judge whether the liquid crystal sensor is in under the reaction condition of predetermineeing, thereby accomplish the detection to the detected object. The liquid crystal sensor only needs a small amount of liquid crystal which is in contact with the hydrophilic-hydrophobic conversion film, so that the liquid crystal sensor can be made thinner. In addition, when the liquid crystal sensor is used for detection, the solute liquid crystal layer is not contacted with a detection object, so that the solute liquid crystal layer can be repeatedly used, and the cost of the liquid crystal sensor is reduced.
In addition, for different detection objects, detection can be realized only by replacing the hydrophilic-hydrophobic conversion film which reacts to different conditions, so that the liquid crystal sensor can realize detection of various detection objects.
The thickness of the existing liquid crystal sensor is generally 2-5 microns, and after the technical scheme of the invention is adopted, the thickness of a solute liquid crystal layer can be reduced to 0.5-1 micron, so that the lightness and thinness of the liquid crystal sensor can be realized.
Further, the liquid crystal sensor further includes:
hold the transparent holding tank of solute liquid crystal layer, the holding tank has an opening, hydrophilic hydrophobic switching film is located the opening part, with the solute liquid crystal layer contacts.
Specifically, in an initial state, the surface of the hydrophilic-hydrophobic switching film in contact with the solute liquid crystal layer is in a hydrophobic state, the orientation direction of the solute liquid crystal layer is irregular, and through preset reaction conditions, the surface of the hydrophilic-hydrophobic switching film in contact with the solute liquid crystal layer is in a hydrophilic state, and the orientation direction of the solute liquid crystal layer is regular. Thus, whether the liquid crystal sensor is under the preset reaction condition can be judged by detecting the light beam penetrating through the liquid crystal sensor.
As shown in fig. 3, in an initial state, the hydrophobic groups 5 of the hydrophilic-hydrophobic transfer film are in contact with the solute liquid crystal layer, and the orientation direction of the liquid crystal molecules 1 in the solute liquid crystal layer is irregular; as shown in fig. 4, under preset reaction conditions, the hydrophilic-hydrophobic switching film is excited, one side of the hydrophilic-hydrophobic switching film facing the solute liquid crystal layer is changed into a hydrophilic group 4, the hydrophilic group 4 is in contact with the solute liquid crystal layer, and the hydrophilic group 4 has a large number of hydroxyl groups and has strong anchoring energy with the liquid crystal molecules 1, so that the orientation of the liquid crystal molecules 1 in the solute liquid crystal layer can be changed, and the orientation direction of the liquid crystal molecules 1 in the solute liquid crystal layer is changed to be regular.
In this embodiment, the liquid crystal sensor uses a solute liquid crystal layer. The liquid crystal is divided into two categories of thermotropic liquid crystal and solute liquid crystal, the solute liquid crystal is a liquid crystal system consisting of a compound and a solute which meet certain structural requirements, and the most common solvent of the solute liquid crystal is composed of water and hydrophilic groups, such as soapy water and the like. When the surface of the hydrophilic-hydrophobic conversion film facing the solute liquid crystal layer is in a hydrophobic state, the orientation direction of liquid crystal molecules is irregular; when the surface of the hydrophilic-hydrophobic conversion film facing the solute liquid crystal layer is in a hydrophilic state, the hydrophilic groups of the hydrophilic-hydrophobic conversion film interact with the hydrophilic groups in the solute liquid crystal layer, so that the orientation of liquid crystal molecules can be changed, and the orientation direction of the liquid crystal molecules is changed to be regular.
The hydrophilic-hydrophobic switching film is a functional film layer with a surface capable of being reversibly switched between a hydrophobic state and a hydrophilic state. The hydrophilic-hydrophobic conversion film has various types and various corresponding reaction conditions, and the preset reaction conditions comprise at least one of the following conditions: receiving light, contacting with liquid with preset PH value, at preset temperature, contacting with preset biological molecules, contacting with preset chemical materials, and under the action of electric field.
For example, the surface of a hydrophilic-hydrophobic conversion film is a dendritic bismuth coating, and after the hydrophilic-hydrophobic conversion film is modified by a stearic acid surface, the surface of the hydrophilic-hydrophobic conversion film shows excellent super-hydrophobic performance and self-cleaning performance, the static water contact angle is as high as 165 degrees, and the rolling angle is lower than 5 degrees. However, the hydrophilic-hydrophobic conversion film can be changed from a super-hydrophobic state to a super-hydrophilic state 50 minutes after receiving ultraviolet light illumination, and the static water contact angle is as low as 5 degrees; the illuminated hydrophilic surface can be modified again by stearic acid and can be restored to the super-hydrophobic state, so that the light-controlled reversible conversion of the surface of the hydrophilic-hydrophobic conversion film between the super-hydrophobic state and the super-hydrophilic state is realized.
Still another hydrophilic-hydrophobic switching film is a PNIPAA (affinity temperature sensitive polymer) high molecular film which can be reversibly switched between a super-hydrophilic state and a super-hydrophobic state under the action of an electric field, heat treatment and/or solvent treatment.
And a hydrophilic-hydrophobic conversion film made of TiO2And SiO2The surface of the hydrophilic-hydrophobic conversion film has excellent super-hydrophilicity under illumination, but after the hydrophilic-hydrophobic conversion film is placed in the dark for a period of time, the super-hydrophilicity on the surface of the hydrophilic-hydrophobic conversion film disappears.
In this embodiment, combine solute liquid crystal layer and hydrophilic hydrophobic conversion film, cover hydrophilic hydrophobic conversion film on solute liquid crystal layer, different hydrophilic hydrophobic conversion films all can react to temperature, illumination, pH value, electric field and chemical material etc. take place its surface by the conversion of hydrophilicity to hydrophobicity, the deflection of liquid crystal molecule is influenced in this kind of conversion, and then change solute liquid crystal layer refraction light's ability to the realization is to the detection of temperature, optics, biomolecule, protein, harmful chemical substance, pH value, electric field etc.. For different detection objects, only the hydrophilic-hydrophobic conversion film on the surface of the liquid crystal sensor needs to be replaced, and the hydrophilic-hydrophobic conversion film capable of reacting with the corresponding detection object is replaced, so that the detection method is convenient and fast.
The embodiment of the invention also provides a detection method of the liquid crystal sensor, which comprises the following steps:
placing the liquid crystal sensor under a reaction condition to be detected;
and emitting a detection light beam from one side of the liquid crystal sensor, detecting the emitted light beam from the other side of the liquid crystal sensor, and judging whether the liquid crystal sensor is placed under a preset reaction condition or not according to a detection result.
In this embodiment, the liquid crystal sensor includes solute liquid crystal layer and hydrophilic-hydrophobic switching film, under the reaction condition of predetermineeing, the surface of hydrophilic-hydrophobic switching film towards solute liquid crystal layer can be switched between hydrophilic state and hydrophobic state, when the surface of hydrophilic-hydrophobic switching film towards solute liquid crystal layer is in hydrophilic state, because hydrophilic group has a large amount of hydroxyls, and have stronger anchor energy between the liquid crystal, can make the orientation of solute liquid crystal layer produce the change, change the ability of liquid crystal sensor refraction light, thereby influence the light path through solute liquid crystal layer, like this through the measuring beam of launching on one side of the liquid crystal sensor, detect the transmitted light beam on the liquid crystal sensor opposite side, can judge whether the liquid crystal sensor is in under the reaction condition of predetermineeing, thereby accomplish the detection to the detected object. The liquid crystal sensor only needs a small amount of liquid crystal which is in contact with the hydrophilic-hydrophobic conversion film, so that the liquid crystal sensor can be made thinner. In addition, when the liquid crystal sensor is used for detection, the solute liquid crystal layer is not contacted with a detection object, so that the solute liquid crystal layer can be repeatedly used, and the cost of the liquid crystal sensor is reduced.
Fig. 5 is a schematic diagram of a liquid crystal sensor according to an embodiment of the present invention, as shown in fig. 5, in an initial state, a surface of the hydrophilic-hydrophobic conversion film 6 facing the solute liquid crystal layer is in a hydrophobic state, and an initial alignment direction of the liquid crystal molecules 1 is irregular, in which if a detection beam is emitted from one side of the liquid crystal sensor and the transmitted beam is received from the other side of the liquid crystal sensor, since the liquid crystal sensor changes a propagation direction of the detection beam, an intensity of the received beam is significantly weaker than an intensity of the detection beam.
Fig. 6 is a schematic diagram of detection by using a liquid crystal sensor according to an embodiment of the present invention, as shown in fig. 6, after a substance 2 to be detected is in contact with a hydrophilic-hydrophobic conversion film 6, the surface of the hydrophilic-hydrophobic conversion film facing a solute liquid crystal layer is converted from a hydrophobic state to a hydrophilic state, when the surface of the hydrophilic-hydrophobic conversion film 6 facing the solute liquid crystal layer is in the hydrophilic state, due to a large number of hydroxyl groups existing in the hydrophilic groups and strong anchoring energy between the hydrophilic groups and liquid crystal, the orientation of liquid crystal molecules 1 in the solute liquid crystal layer can be changed, and the orientation direction of the liquid crystal molecules 1 becomes regular, at this time, a detection beam 3 is emitted from one side of the liquid crystal sensor, and the transmitted beam is received from the other side of the liquid crystal sensor. Therefore, the detection of substances to be detected, such as biomolecules, proteins and harmful chemical substances, can be realized by comparing the light beams transmitted by the liquid crystal sensor, and the detection of temperature, optics, an electric field, the pH value of liquid and the like can also be realized in the same way.
In a specific embodiment, the preset reaction condition is at a preset temperature, and at the preset temperature, the surface of the hydrophilic-hydrophobic switching film, which is in contact with the solute liquid crystal layer, is switched from a hydrophobic state to a hydrophilic state, and the detection method specifically includes:
emitting a detection light beam from one side of the liquid crystal sensor, detecting the emitted light beam from the other side of the liquid crystal sensor, and judging that the orientation direction of the solute liquid crystal layer is irregular according to a detection result;
placing the liquid crystal sensor under a reaction condition to be detected;
emitting a detection light beam from one side of the liquid crystal sensor, detecting the emitted light beam from the other side of the liquid crystal sensor, judging that the orientation direction of the solute liquid crystal layer is regular according to a detection result, and determining that the liquid crystal sensor is at a preset temperature.
In another specific embodiment, the preset reaction condition is that ultraviolet light is received, and after the ultraviolet light is received, the surface of the hydrophilic-hydrophobic conversion film, which is in contact with the solute liquid crystal layer, is converted from a hydrophobic state to a hydrophilic state, and the detection method specifically includes:
emitting a detection light beam from one side of the liquid crystal sensor, detecting the emitted light beam from the other side of the liquid crystal sensor, and judging that the orientation direction of the solute liquid crystal layer is irregular according to a detection result;
placing the liquid crystal sensor under a reaction condition to be detected;
emitting a detection light beam from one side of the liquid crystal sensor, detecting the emitted light beam from the other side of the liquid crystal sensor, judging that the orientation direction of the solute liquid crystal layer is regular according to the detection result, and determining that the liquid crystal sensor is under ultraviolet irradiation.
In another specific embodiment, the preset reaction condition is that the liquid crystal layer is subjected to an electric field, and after the liquid crystal layer is subjected to the electric field, the surface of the hydrophilic-hydrophobic switching film, which is in contact with the solute liquid crystal layer, is switched from a hydrophobic state to a hydrophilic state, and the detection method specifically includes:
emitting a detection light beam from one side of the liquid crystal sensor, detecting the emitted light beam from the other side of the liquid crystal sensor, and judging that the orientation direction of the solute liquid crystal layer is irregular according to a detection result;
placing the liquid crystal sensor under a reaction condition to be detected;
emitting a detection light beam from one side of the liquid crystal sensor, detecting the emitted light beam from the other side of the liquid crystal sensor, judging that the orientation direction of the solute liquid crystal layer is regular according to the detection result, and determining that the liquid crystal sensor is under the action of an electric field.
In another specific embodiment, the preset reaction condition is that the surface of the hydrophilic-hydrophobic switching film, which is in contact with the solute liquid crystal layer, is switched from a hydrophobic state to a hydrophilic state after the surface of the hydrophilic-hydrophobic switching film, which is in contact with the liquid with the preset PH value, or the surface of the hydrophilic-hydrophobic switching film, which is in contact with the solute liquid crystal layer, is in contact with the preset biomolecule:
emitting a detection light beam from one side of the liquid crystal sensor, detecting the emitted light beam from the other side of the liquid crystal sensor, and judging that the orientation direction of the solute liquid crystal layer is irregular according to a detection result;
contacting the hydrophilic-hydrophobic conversion film with a substance to be detected;
emitting a detection light beam from one side of the liquid crystal sensor, detecting the transmitted light beam from the other side of the liquid crystal sensor, judging that the orientation direction of the solute liquid crystal layer is regular according to a detection result, and determining that the substance to be detected is liquid with a preset PH value or preset biological molecules or preset chemical materials.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "under" another element, it can be "directly on" or "under" the other element or intervening elements may be present.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. A liquid crystal sensor, comprising:
a solute liquid crystal layer;
and the hydrophilic-hydrophobic switching film covers the solute liquid crystal layer, and the surface of the hydrophilic-hydrophobic switching film facing the solute liquid crystal layer can be reversibly switched between a hydrophilic state and a hydrophobic state under preset reaction conditions.
2. The liquid crystal sensor of claim 1, wherein the predetermined reaction conditions include at least one of: receiving illumination, and placing the lamp at a preset temperature and under the action of an electric field.
3. The liquid crystal sensor of claim 1, further comprising:
hold the transparent holding tank of solute liquid crystal layer, the holding tank has an opening, hydrophilic hydrophobic switching film is located the opening part, with the solute liquid crystal layer contacts.
4. The liquid crystal sensor of claim 1, wherein the solute liquid crystal layer has a thickness of 0.5-1 micron.
5. The liquid crystal sensor according to any one of claims 1 to 4, wherein in an initial state, a surface of the hydrophilic-hydrophobic switching film in contact with the solute liquid crystal layer is in a hydrophobic state, an alignment direction of the solute liquid crystal layer is irregular, and under a preset reaction condition, the surface of the hydrophilic-hydrophobic switching film in contact with the solute liquid crystal layer is in a hydrophilic state, and the alignment direction of the solute liquid crystal layer is regular.
6. A detection method of a liquid crystal sensor according to any one of claims 1 to 5, comprising:
placing the liquid crystal sensor under a reaction condition to be detected;
and emitting a detection light beam from one side of the liquid crystal sensor, detecting the emitted light beam from the other side of the liquid crystal sensor, and judging whether the liquid crystal sensor is placed under a preset reaction condition or not according to a detection result.
7. The detection method of the liquid crystal sensor according to claim 6, wherein the detection method is applied to the liquid crystal sensor according to claim 5, and the surface of the hydrophilic-hydrophobic switching film, which is in contact with the solute liquid crystal layer, is switched from a hydrophobic state to a hydrophilic state at a preset temperature, and the detection method specifically comprises:
emitting a detection light beam from one side of the liquid crystal sensor, detecting the emitted light beam from the other side of the liquid crystal sensor, and judging that the orientation direction of the solute liquid crystal layer is irregular according to a detection result;
placing the liquid crystal sensor under a reaction condition to be detected;
emitting a detection light beam from one side of the liquid crystal sensor, detecting the emitted light beam from the other side of the liquid crystal sensor, judging that the orientation direction of the solute liquid crystal layer is regular according to a detection result, and determining that the liquid crystal sensor is at a preset temperature.
8. The detection method of the liquid crystal sensor according to claim 6, wherein the detection method is applied to the liquid crystal sensor according to claim 5, and after receiving ultraviolet light irradiation, the surface of the hydrophilic-hydrophobic switching film, which is in contact with the solute liquid crystal layer, is switched from a hydrophobic state to a hydrophilic state, and the detection method specifically comprises:
emitting a detection light beam from one side of the liquid crystal sensor, detecting the emitted light beam from the other side of the liquid crystal sensor, and judging that the orientation direction of the solute liquid crystal layer is irregular according to a detection result;
placing the liquid crystal sensor under a reaction condition to be detected;
emitting a detection light beam from one side of the liquid crystal sensor, detecting the emitted light beam from the other side of the liquid crystal sensor, judging that the orientation direction of the solute liquid crystal layer is regular according to the detection result, and determining that the liquid crystal sensor is under ultraviolet irradiation.
9. The detection method of the liquid crystal sensor according to claim 6, wherein the surface of the hydrophilic-hydrophobic switching film in contact with the solute liquid crystal layer is switched from a hydrophobic state to a hydrophilic state after being subjected to the electric field, and the detection method specifically comprises:
emitting a detection light beam from one side of the liquid crystal sensor, detecting the emitted light beam from the other side of the liquid crystal sensor, and judging that the orientation direction of the solute liquid crystal layer is irregular according to a detection result;
placing the liquid crystal sensor under a reaction condition to be detected;
emitting a detection light beam from one side of the liquid crystal sensor, detecting the emitted light beam from the other side of the liquid crystal sensor, judging that the orientation direction of the solute liquid crystal layer is regular according to the detection result, and determining that the liquid crystal sensor is under the action of an electric field.
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| WO2012052147A1 (en) * | 2010-10-19 | 2012-04-26 | MAX-PLANCK-Gesellschaft zur Förderung der Wissenschaften e.V. | Process for the modification of polymers, in particular polymer nanoparticles |
| US20130344577A1 (en) * | 2012-06-20 | 2013-12-26 | Sony Corporation | Liquid crystal based sensor devices for detecting toxins, bacteria and their activities |
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