CN105923622B - A kind of polyacrylonitrile nanofiber/polyimide-based carbon aerogels adsorbent material and preparation method thereof - Google Patents
A kind of polyacrylonitrile nanofiber/polyimide-based carbon aerogels adsorbent material and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to carbon adsorbing material technical field, specially a kind of polyacrylonitrile nanofiber/polyimide-based carbon aerogels adsorbent material and preparation method thereof.Polyacrylonitrile nanofiber of the invention/polyimide-based carbon aerogels adsorbent material is using Static Spinning polyacrylonitrile nanofiber and water-soluble polyamic acid as raw material, its preparation process includes: to prepare polyacrylonitrile nanofiber first with electrostatic spinning technique, then the polyacrylonitrile nanofiber pre-oxidized by a step, and then it is by high-speed stirred that Static Spinning polyacrylonitrile nanofiber and water-soluble polyamic acid is evenly dispersed, compound carbon aerogels are prepared by Freeze Drying Technique, hot imidization and high temperature cabonization technology.Carbon aerogels adsorbent material pore-size distribution obtained by the present invention is uniform, large specific surface area, intensity is high, density is small, is a kind of adsorbent material haveing excellent performance, can be widely applied to the fields such as sewage treatment, air cleaning.
Description
Technical field
The invention belongs to carbon adsorbing material technical fields, and in particular to a kind of polyacrylonitrile nanofiber/polyimide-based
Carbon aerogels adsorbent material and preparation method thereof, the carbon aerogels adsorbent material pore-size distribution is uniform, large specific surface area, strong
Degree is high, density is small, is a kind of adsorbent material haveing excellent performance, can be widely applied to the fields such as sewage treatment, air cleaning.
Background technique
In recent years, air pollution, water pollution, the soil pollution to increasingly sharpen increases the environmental protection consciousness of people constantly
By force, especially after the universalness of PM2.5 concept, material development person puts into searching, preparation for environmental protection and improvement one after another
New material action in.Wherein, adsorbent material has many advantages, such as high-specific surface area, high porosity, structure-controllable, at sewage
There is very extensive application in the fields such as reason, air cleaning.Active carbon is one of current main commercially available adsorbent material, but due to
Its internal structure is fine and close, and adsorbance is relatively low.Therefore, the internal carbon material more loose porous, that porosity is bigger of exploitation is
The hot and difficult issue of current research.
Carbon aerogels are the carbon adsorbing materials for a kind of excellent combination property that developed recently gets up.The study found that carbon airsetting
The performance of glue and its internal porous structure are closely related, how to be rationally designed and be regulated and controled by the microstructure to material
It is the key that further promotion carbon aerogels comprehensive performance.However, the microstructure of most of carbon aerogels is still relatively more single at present
One, such as: the carbon fiber aeroge being made of one-dimensional carbon fiber merely, the graphene carbon aeroge being made of two-dimensional graphene.
Therefore, how the nano material (such as one-dimensional carbon fiber, two-dimensional sheet carbon) of different dimensions is carried out high efficiency composition is to prepare high property
One of the important development direction of energy carbon aerogels.
Therefore, the present invention is forerunner with Static Spinning polyacrylonitrile 1-dimention nano fiber and water-soluble polyamic acid macromolecule
Body is successfully prepared one kind by one-dimensional by technical process such as pre-oxidation, high-speed stirred, freeze-drying, hot imidization, carbonizations
The carbon aerogels material that carbon nano-fiber and two-dimensional sheet carbon are constituted.The polyacrylonitrile nanofiber/polyimide-based carbon gas
Gel adsorption material mainly has the advantage that primary solvent used in (1) the carbon aerogels adsorbent material preparation process is
Water, therefore the technique does not generate pollution to environment substantially；(2) the carbon aerogels adsorbent material is received by two-dimensional sheet carbon and one-dimensional carbon
Rice fiber is constituted, and carbon nano-fiber crosses between two-dimensional sheet carbon, plays the role of mutually supporting, this is not only significantly
Improve the mechanical property of material entirety, and the presence of this special construction also improve material entirety " siphonic effect ",
So that being greatly improved for the more most of one-component carbon aerogels materials of the absorption property of the carbon aerogels.
Summary of the invention
The polyacrylonitrile nanofiber that the purpose of the present invention is to provide a kind of preparation process is environmental-friendly, has excellent performance/
Polyimide-based carbon aerogels adsorbent material and preparation method thereof.
Polyacrylonitrile nanofiber proposed by the present invention/polyimide-based carbon aerogels adsorbent material preparation method, tool
Steps are as follows for body:
(1) under stiring, certain density polyacrylonitrile (PAN) spinning solution is prepared；
(2) by method of electrostatic spinning, PAN nanofiber is prepared；
(3) temperature programming under air conditions pre-oxidizes the PAN nanofiber of step (2) preparation, obtains surface
Hydrophily preoxidised polyacrylonitrile (being denoted as o-PAN) nanofiber with oxygen-containing functional group；
(4) the o-PAN nanofiber dispersion of step (3) is obtained in deionized water, after high-speed stirred evenly dispersed
Dispersion liquid；
(5) water-soluble polyamic acid (PAA) dissolution in deionized water, is obtained into polyamic acid solution after stirring；
(6) after mixing the solution of step (4) and step (5), further high-speed stirred obtains evenly dispersed o-PAN and receives
The blending dispersion liquid of rice fiber and PAA；
(7) step (6) resulting dispersion liquid is freezed in refrigerator or liquid nitrogen as solid, it is then cold in freeze drier
It is lyophilized dry, obtains polyacrylonitrile nanofiber/polyamic acid aeroge, be denoted as o-PAN/PAA；
(8) utilize Temperature Programmed Processes, by the resulting polyacrylonitrile nanofiber of step (7)/polyamic acid aeroge into
Row hot imidization and carbonization obtain polyacrylonitrile nanofiber/polyimide-based carbon aerogels, are denoted as oP.
In step (1) of the present invention, solvent used in polyacryl-nitrile spinning fluid isN,NDimethylformamide, concentration (quality
Score) it is 10% ~ 15%.
In step (2) of the present invention, the electrostatic spinning process parameter are as follows: voltage is 15 ~ 20 kV, spinning vessel used
For the 5 mL plastic injectors that pinhole diameter is 0.5 mm, flow velocity is 0.2 ~ 0.3 mm/min, and receiving distance is 10 ~ 20 cm.
In step (3) of the present invention, the programmed rate is 1 ~ 2 DEG C/min, after rising to 230 ~ 280 DEG C of platform temperature
1.5-2.5 h(is kept to preferably remain 2 h).
In step (4) of the present invention, to the high-speed stirred of the polyacrylonitrile nanofiber of pre-oxidation by model IKA T25
Refiner realize, 15000 ~ 21000 r/min of mixing speed, preferably mixing speed be 18000 r/min, mixing time 20
~ 40 min, preferably mixing time are 30 min.
In step (5) of the present invention, the preparation method of the water-soluble polyamic acid is the same as patent CN104355302A.
In step (5) of the present invention, the diamine monomer of the synthesis of polyimides includes p-phenylenediamine (PPDA), 4,4 '
Diaminodiphenyl ether (ODA), binary anhydride monomer include pyromellitic acid anhydride (PMDA), biphenyltetracarboxylic dianhydride (BPDA) or
Diphenyl ether tetracarboxylic dianhydride (ODPA).
In step (5) of the present invention, the polar solvent of the synthesis of polyimides includesN,NDimethyl acetamide,NFirst
Base pyrrolidones,N,NDimethylformamide.
In step (6) of the present invention, the dispersion liquid total solid content is 2 ~ 4%, and the mass fraction of PAA is 35 ~ 100%
(preferably 35 ~ 95%).
In step (8) of the present invention, the hot imidization process are as follows: the polyacrylonitrile nanofiber/polyamide that will be obtained
The temperature programming in nitrogen atmosphere of acid gas gel, design parameter are as follows: with the heating rate of 1.5-2.5 DEG C/min (preferably 2 DEG C/
The heating rate of min) from room temperature 300 DEG C are risen to, and respectively at 100 DEG C, 200 DEG C, 300 DEG C of holdings 0.5 h, 0.5 h,
It is down to room temperature naturally after 1 h.
In step (8) of the present invention, the carbonisation are as follows: by the polyacrylonitrile nanofiber after hot imidization/
The temperature programming in nitrogen atmosphere of polyamic acid aeroge, design parameter are as follows: with the heating rate (preferably 5 of 4-6 DEG C/min
DEG C/heating rate of min) and from room temperature to 800 ~ 1400 DEG C, 0.5 ~ 2h is kept, is then down to room temperature naturally.
Attached drawing 1 is polyacrylonitrile nanofiber/polyimide-based carbon aerogels preparation process schematic diagram.
Polyacrylonitrile nanofiber prepared by the present invention/polyimide-based carbon aerogels material, pore-size distribution is uniform, compares table
Area is big, intensity is high, density is small, is a kind of adsorbent material haveing excellent performance, can be widely applied to sewage treatment, air cleaning
Equal fields.
The present invention is characterized using scanning electron microscope (SEM), transmission electron microscope (TEM), electronic balance to be obtained
Polyacrylonitrile nanofiber/polyimide-based carbon aerogels adsorbent material structure and morphology and absorption property obtained, result is such as
Under:
(1) SEM test result shows: prepared polyacrylonitrile nanofiber/polyimide-based carbon airsetting in the present invention
Glue is made of one-dimensional carbon nano-fiber and two-dimensional sheet carbon, shows porous structure, and is interconnected between hole, is internal
There is carbon nano-fiber interspersed, to form specific ordered 3 D structure.Constructing for this special construction substantially increases carbon materials
The specific surface area of material provides more storage spaces for the absorption of organic pollutant, sub- to polyacrylonitrile nanofiber/polyamides
The raising of amido carbon aerogels performance plays a key effect, referring to attached drawing 2；
(2) TEM test result shows: prepared polyacrylonitrile nanofiber/polyimide-based carbon airsetting in the present invention
The internal structure of glue can more fully be embodied from TEM, it is found that one-dimensional carbon nano-fiber is worn inside two-dimensional sheet carbon
It inserts and mistake, polyacrylonitrile nanofiber/polyimide-based carbon aerogels of height hydridization has been obtained, referring to attached drawing 3；
(3) absorption test result shows prepared polyacrylonitrile nanofiber/polyimide-based carbon aerogels to common
Organic solvent and oily matter have preferable suction-operated.Result of study shows polyacrylonitrile nanofiber/polyimide-based
Carbon aerogels have reached 20-62 times of own wt to the adsorbance of different material, wherein showing most excellent suction to pump oil
Attached performance (62 times that reach own wt), referring to attached drawing 4.This can mainly be attributed to the fact that porous structure inside carbon aerogels and receive
" siphonic effect " of rice carbon fiber.In addition, being carried out to polyacrylonitrile nanofiber/polyimide-based carbon aerogels cycle performance
Detection, it is found that it shows excellent stable circulation performance to ethyl alcohol and acetone.After 5 circulation absorptions, adsorbance is equal
It is maintained at 90% or more of starting adsorbance；
(4) rate of adsorption test result shows that prepared polyacrylonitrile nanofiber/polyimide-based carbon aerogels are inhaled
Enclosure material has all shown the characteristic of quick adsorption to heptane and chloroform, it is found that it can be in 9 s by the heptane on bubbling through the water column
All absorption is clean, also demersal chloroform solution quickly can be dripped off full absorption in 1.5 s.This illustrates polyacrylonitrile
Nanofiber/excellent the absorption property of polyimide-based carbon aerogels adsorbent material, referring to attached drawing 5；
(5) polyacrylonitrile nanofiber/polyimide-based carbon aerogels adsorbent material prepared by is met after adsorbing alcohol
Fire can burn immediately, and as the consumption flame of alcohol constantly weakens until extinguishing.After fray-out of flame, polyacrylonitrile nano is fine
Dimension/polyimide-based carbon aerogels adsorbent material not by any destruction, this also illustrates the adsorbent material possess it is very excellent
Different stable circulation performance participates in attached drawing 6.
Compared with prior art, the present invention its remarkable advantage is as follows:
(1) presoma that carbon nano-fiber is prepared using electrostatic spinning technique, the scale for substantially increasing material preparation can
Control property；
(2) preparation process is simple, easily operated, and carries out under the conditions of water system, is a kind of Green Chemistry preparation method；
(3) entirety is not only increased by being connected with each other through structure between one-dimensional carbon nano-fiber and two-dimensional sheet carbon
Its mechanical property greatly improved in the stability of structure, and increases the specific surface area of material, shows it superior
Absorption property.
Detailed description of the invention
Fig. 1 is polyacrylonitrile nanofiber in the present invention/polyimide-based carbon aerogels preparation process schematic diagram.
Fig. 2 is polyacrylonitrile nanofiber/polyimide-based carbon aerogels adsorbent material SEM prepared in the present invention
Photo.
Fig. 3 is polyacrylonitrile nanofiber/polyimide-based carbon aerogels adsorbent material TEM prepared in the present invention
Photo.
Fig. 4 is polyacrylonitrile nanofiber/polyimide-based carbon aerogels adsorbent material suction prepared in the present invention
Attached the performance test results: to the adsorbance of different solvents.
Fig. 5 is polyacrylonitrile nanofiber/polyimide-based carbon aerogels adsorbent material prepared in the present invention to not
With the test result of solvent adsorption rate.Wherein, (a) is polyacrylonitrile nanofiber/polyimide-based carbon aerogels adsorption material
Expect the rate of adsorption photo to heptane；It (b) is polyacrylonitrile nanofiber/polyimide-based carbon aerogels adsorbent material to chloroform
Rate of adsorption photo.
Fig. 6 is that polyacrylonitrile nanofiber/polyimide-based carbon aerogels adsorbent material prepared in the present invention is being inhaled
Combustion experiment photo after attached alcohol.
Specific embodiment
Below with reference to specific example, the present invention is further explained, it should be appreciated that these embodiments be merely to illustrate the present invention and
It is not used in and limits the scope of the invention.In addition, it should also be understood that, after reading the content taught by the present invention, those skilled in the art
Various changes or modification can be made to the present invention, such equivalent forms are equally fallen within defined by the application the appended claims
Range.
Embodiment 1, the present embodiment the following steps are included:
It weighs 3 g polyacrylonitrile (PAN) powder to be mixed into 30 mL DMF, stirring 6 h at room temperature, to obtain color micro-
Yellow polyacrylonitrile spinning solution.Above-mentioned solution is spun into nanofiber, design parameter by electrostatic spinning technique are as follows: voltage is
18 kV, spinning vessel used are the 5 mL plastic injectors that pinhole diameter is 0.5 mm, and flow velocity is 0.2 mm/min, receive away from
From for 15 cm, the spinning time is 1 h.By the polyacrylonitrile nanofiber film of deposition on the collector under temperature programming control
Carry out pre-oxidation treatment, the polyacrylonitrile nanofiber pre-oxidized (o-PAN), design parameter are as follows: heating rate be 2 DEG C/
Min keeps 2 h after rising to 250 DEG C of platform temperature.
By the above-mentioned o-PAN nanofiber dispersion of 1.95 g in 50 mL deionized waters, in the stirring speed of 18000 r/min
Lower 30 min of high-speed stirred is spent, evenly dispersed suspension (1) is obtained.1.05 g water-soluble polyamic acids are dissolved in 50 mL
In deionized water, polyamic acid solution is obtained under standard machinery stirring.It is then that suspension (1) and polyamic acid solution is mixed
It closes, 10 min of further high-speed stirred obtains polyacrylonitrile nanofiber and polyamide under the mixing speed of 18000 r/min
The mixing suspension of acid.The mixing suspension is freezed for solid in refrigerator or liquid nitrogen, is then freezed in freeze drier
Dry 48 h, obtain polyacrylonitrile nanofiber/polyamic acid aeroge, are denoted as o-PAN/PAA-35.
Then, above-mentioned polyacrylonitrile nanofiber/polyamic acid aeroge is subjected to hot imidization and carbonization, obtains poly- third
Alkene nitrile nanofibre/polyimide-based carbon aerogels adsorbent material, is denoted as oP-35.The specific procedure of hot imidization are as follows: with 2 DEG C/
The heating rate of min rises to 300 DEG C from room temperature, and respectively at 100 DEG C, 200 DEG C, 300 DEG C of holdings 0.5 h, 0.5 h, 1
Naturally room temperature is down to after h.The specific procedure of carbonization are as follows: with the heating rate of 5 DEG C/min from room temperature to 800 DEG C, keep 1h
It is down to room temperature naturally afterwards.
Embodiment 2, the present embodiment the following steps are included:
It weighs 3 g polyacrylonitrile (PAN) powder to be mixed into 30 mL DMF, stirring 6 h at room temperature, to obtain color micro-
Yellow polyacrylonitrile spinning solution.Above-mentioned solution is spun into nanofiber by electrostatic spinning technique, design parameter is as follows: voltage
For 18 kV, spinning vessel used is the 5 mL plastic injectors that pinhole diameter is 0.5 mm, and flow velocity is 0.2 mm/min, is received
Distance is 15 cm, and the spinning time is 1 h.The polyacrylonitrile nanofiber film of deposition on the collector is controlled in temperature programming
Under to above-mentioned tunica fibrosa carry out pre-oxidation treatment, the polyacrylonitrile nanofiber pre-oxidized (o-PAN), design parameter are as follows:
Heating rate is 2 DEG C/min, keeps 2 h after rising to 250 DEG C of platform temperature.
By the above-mentioned o-PAN nanofiber dispersion of 1.5 g in 50 mL deionized waters, in the mixing speed of 18000 r/min
Lower 30 min of high-speed stirred, obtains evenly dispersed suspension (1).By 1.5 g water-soluble polyamic acids be dissolved in 50 mL go from
In sub- water, polyamic acid solution is obtained under standard machinery stirring.Then suspension (1) is mixed with polyamic acid solution,
10 min of further high-speed stirred obtains the mixed of polyacrylonitrile nanofiber and polyamic acid under the mixing speed of 18000 r/min
Close suspension.The mixing suspension is freezed for solid in refrigerator or liquid nitrogen, 48 are then freeze-dried in freeze drier
H obtains polyacrylonitrile nanofiber/polyamic acid aeroge, is denoted as o-PAN/PAA-50.
Then, above-mentioned polyacrylonitrile nanofiber/polyamic acid aeroge is subjected to hot imidization and carbonization, obtains poly- third
Alkene nitrile nanofibre/polyimide-based carbon aerogels adsorbent material, is denoted as oP-50.The specific procedure of hot imidization are as follows: with 2 DEG C/
The heating rate of min rises to 300 DEG C from room temperature, and respectively at 100 DEG C, 200 DEG C, 300 DEG C of holdings 0.5 h, 0.5 h, 1
Naturally room temperature is down to after h.The specific procedure of carbonization are as follows: with the heating rate of 5 DEG C/min from room temperature to 800 DEG C, keep 1h
It is down to room temperature naturally afterwards.
Embodiment 3, the present embodiment the following steps are included:
3 g water-soluble polyamic acids are dissolved in 100 mL deionized waters, obtain polyamide under standard machinery stirring
Acid solution.Polyamic acid solution is freezed for solid in refrigerator or liquid nitrogen, 48 h is then freeze-dried in freeze drier,
Polyamic acid aeroge is obtained, PAA is denoted as.
Then, above-mentioned polyamic acid aeroge is subjected to hot imidization and carbonization, obtains polyimide-based carbon aerogels and inhales
Enclosure material is denoted as oP-100.The specific procedure of hot imidization are as follows: 300 DEG C are risen to from room temperature with the heating rate of 2 DEG C/min, and
It is down to room temperature naturally after 100 DEG C, 200 DEG C, 300 DEG C of holdings 0.5 h, 0.5 h, 1 h respectively.The specific procedure of carbonization
Are as follows: with the heating rate of 5 DEG C/min from room temperature to 800 DEG C, it is down to room temperature naturally after keeping 1h.
Claims (4)
1. a kind of polyacrylonitrile nanofiber/polyimide-based carbon aerogels adsorbent material preparation method, it is characterised in that tool
Steps are as follows for body:
(1) under stiring, polyacrylonitrile (PAN) spinning solution is prepared；
(2) by method of electrostatic spinning, PAN nanofiber is prepared；
(3) the PAN nanofiber of step (2) preparation is pre-oxidized, surface is obtained by temperature programming under air conditions
Hydrophily preoxidised polyacrylonitrile with oxygen-containing functional group, is denoted as o-PAN, nanofiber；The programmed rate is 1
~ 2 DEG C/min, 1.5-2.5 h is kept after rising to 230 ~ 280 DEG C of platform temperature；
(4) the o-PAN nanofiber dispersion of step (3) is obtained into evenly dispersed dispersion in deionized water, after high-speed stirred
Liquid；Mixing speed is 15000 ~ 21000 r/min, and mixing time is 20 ~ 40 min；
(5) in deionized water by water-soluble polyamic acid PAA dissolution, polyamic acid solution is obtained after stirring；
(6) solution of step (4) and step (5) is mixed, then further high-speed stirred obtains evenly dispersed o-PAN nanometer
The blending dispersion liquid of fiber and PAA；Dispersion liquid total solid content is 2 ~ 4%, and the mass fraction of PAA is 35 ~ 100%；
(7) the resulting blending dispersion liquid of step (6) is freezed in refrigerator or liquid nitrogen as solid, it is then cold in freeze drier
It is lyophilized dry, obtains polyacrylonitrile nanofiber/polyamic acid aeroge, be denoted as o-PAN/PAA；
(8) Temperature Programmed Processes are utilized, the resulting polyacrylonitrile nanofiber of step (7)/polyamic acid aeroge is subjected to heat
Imidization and carbonization obtain polyacrylonitrile nanofiber/polyimide-based carbon aerogels, are denoted as oP；The hot imidization mistake
Journey are as follows: by obtained polyacrylonitrile nanofiber/polyamic acid aeroge temperature programming in nitrogen atmosphere, design parameter is such as
Under: 300 DEG C are risen to from room temperature with the heating rate of 1.5-2.5 DEG C/min, and respectively at 100 DEG C, 200 DEG C, 300 DEG C keep 0.5
Then h, 0.5 h, 1 h are down to room temperature naturally；
The carbonisation are as follows: by the polyacrylonitrile nanofiber after hot imidization/polyamic acid aeroge in nitrogen
Temperature programming in atmosphere, design parameter are as follows: with the heating rate of 4-6 DEG C/min from room temperature to 800 ~ 1400 DEG C, keeping
Then 0.5 ~ 2h is down to room temperature naturally.
2. polyacrylonitrile nanofiber/polyimide-based carbon aerogels adsorbent material preparation method according to claim 1,
It is characterized in that solvent used in polyacryl-nitrile spinning fluid described in step (1) isN,NDimethylformamide, polyacrylonitrile are spun
The mass concentration of silk liquid is 10% ~ 15%.
3. the preparation of polyacrylonitrile nanofiber according to claim 1 or claim 2/polyimide-based carbon aerogels adsorbent material
Method, it is characterised in that in step (2), electrostatic spinning process parameter are as follows: voltage is 15 ~ 20 kV, and spinning vessel used is pin hole
Diameter is the 5 mL plastic injectors of 0.5 mm, and flow velocity is 0.2 ~ 0.3 mm/min, and receiving distance is 10 ~ 20 cm.
4. a kind of polyacrylonitrile nanofiber that the preparation method as described in one of claim 1-3 obtains/polyimide-based carbon gas
Gel adsorption material, pore-size distribution is uniform, large specific surface area, intensity is high, density is small.
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| CN107715572B (en) * | 2017-11-22 | 2020-11-27 | 湖州达立智能设备制造有限公司 | Filtering material for indoor air purification and preparation method thereof |
| CN109736092B (en) * | 2018-12-29 | 2021-12-10 | 东华大学 | Conductive polyaniline coated polyimide-based porous organic nano composite fiber membrane |
| CN110115886A (en) * | 2019-04-30 | 2019-08-13 | 苏州大学 | A kind of New Hydrogen fuel battery air filter core |
| CN110628217B (en) * | 2019-09-29 | 2021-03-02 | 江南大学 | Nanofiber modified polyimide aerogel material and preparation method thereof |
| CN113353926B (en) * | 2021-05-25 | 2024-04-12 | 安徽国风新材料股份有限公司 | Polyimide film for preparing graphite film, high-heat-conductivity graphite film prepared from polyimide film and preparation method of high-heat-conductivity graphite film |
| CN114632433B (en) * | 2022-04-18 | 2023-05-09 | 南昌大学共青城光氢储技术研究院 | Preparation method of flexible three-dimensional self-supporting noble metal-carbon fiber network material |
| CN115895159B (en) * | 2022-09-09 | 2023-09-15 | 湖北大学 | Polyacrylonitrile-polyimide macroporous oriented nanofiber composite aerogel and preparation method and application thereof |
| CN115818616B (en) * | 2022-11-28 | 2024-06-14 | 四川大学 | Polyimide-based carbon aerogel and preparation method and application thereof |
| CN116199931B (en) * | 2023-03-10 | 2023-12-29 | 湖北大学 | Nanofiber composite aerogel and preparation method and application thereof |
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