Papers by Srimala Sreekantan
Journal of Nanomaterials, 2011
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2008 IEEE International RF and Microwave Conference, 2008
In this paper, small dielectric resonator antenna was design and developed by using high permitti... more In this paper, small dielectric resonator antenna was design and developed by using high permittivity dielectric material of 55. The dimensions of the dielectric resonator were 5.4 mm (width), 9.3 mm (length), and 3.14 mm (height). This DRA operate at a frequency around 5 GHz. It was excited with microstrip line where the position of the DR on the microstrip
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Advanced Materials Research, 2014
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International Journal of Materials, Mechanics and Manufacturing, 2013
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Advanced Materials Research, 2013
ABSTRACT
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Advanced Materials Research, 2014
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Progress In Electromagnetics Research C, 2009
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Materials Science Forum, 2013
ABSTRACT Calcium hydroxides (Ca(OH)2) nanostructures have been fabricated through simple facile s... more ABSTRACT Calcium hydroxides (Ca(OH)2) nanostructures have been fabricated through simple facile solution based synthesis at different temperatures 35,45 and 55°C repectively.Ethanol was utilized as a medium for reaction. The synthesized powder was characterized by Field Emission Scanning Electron Microscope (FESEM SUPRA 35VP ZEISS), Fourier transform infrared (FTIR Perkin Elmer Spectrum One Spectrophotometer) and X-raydiffraction (XRD). Based on XRD analysis, the synthesis samples exhibited crystal hexagonal phase of Ca(OH)2.The crystallite size for powders prepared was between 17 nm to 31 nm. Short nanorod like structures was successfully obtained in 80 ml ethanol solution for entire temperatures. However, the length and diameter decreased with increased the reaction temperatures. Short nanorod synthesized at 55°C has small diameters and length compared at 35°C. Carbon dioxide (CO2) adsorption for synthesized powders was studied by simultaneous thermal analyzer (STA). Ca(OH)2 prepared at 35°C and45°C in 80 ml ethanol showed CO2 adsorption capacity about 9.3 mmol/g and 9.7 mmol/g respectively.
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Advanced Materials Research, 2014
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2008 International Conference on Computer and Communication Engineering, 2008
Two segment rectangular dielectric resonator antenna of high permittivity (epsivr = 30) ceramic m... more Two segment rectangular dielectric resonator antenna of high permittivity (epsivr = 30) ceramic material was design and fabricated at C-band. The antenna was fed with 50Omega microstrip transmission line. In this design, both dielectric resonators (DRs) are separated with metal plate which acting as shorting post. The length of the two DRs is 7.7 mm and 2.2 mm respectively. The
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2008 IEEE International RF and Microwave Conference, 2008
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Materials Science Forum, 2013
ABSTRACT Bacterial are highly transmitted in our environment and have been identified as a primar... more ABSTRACT Bacterial are highly transmitted in our environment and have been identified as a primary contributor to the problem of indoor air quality and consequently lead to the illness of the occupants. Recently, nanotechnology represents an innovative approach to develop new formulations based on metallic nanoparticles with antimicrobial properties. TiO2 has great promise to diminish bacterial activity. Antimicrobial activity of TiO2and Ag-TiO2 nanoparticles against Escherichia coli was examined in this study. TiO2 nanoparticles with various silver contents were synthesized by sol gel method to produce uniform size, unagglomerated state and homogeneous nanoparticles. The nanoparticles were characterized by X-Ray diffraction (XRD) and transmittance electron microscopy (TEM). The effects of different silver concentration were studied using cotton diffusion test under fluorescence light irradiation. 0.06 mol % Ag-TiO2 revealed best antibacterial activity. 0.06 mol % Ag-TiO2 have antibacterial inhibition zone of 38 mm at the concentration of 2.0 M against E. coli. Swab test bacterial counts on left palm, tile, mouse pad and cotton have been tested before and after spraying with 0.06 mol % Ag-TiO2. It showed that the bacterial count decreased for entire samples. The significant enhancement in the antibacterial properties of Ag-TiO2 nanoparticles under visiblelight irradiation is related to the effect of noble metal Ag by acting as electron traps in TiO2 band gap. The phase structure, crystallite size and crystallinity of TiO2 also play an important role inantibacterial activity. The killing mechanism of Ag-TiO2 undervisible light irradiation antibacterial activity over Ag-TiO2nanoparticles was proposed based on our observations.
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Advanced Materials Research, 2012
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Progress In Electromagnetics Research, 2007
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Progress In Electromagnetics Research, 2011
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Journal of the Ceramic Society of Japan, 2012
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Journal of Materials Science: Materials in Electronics, 2011
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Journal of Materials Processing Technology, 2008
Barium titanate powder was processed at temperature 80 °C by reacting TiO 2 sol in aqueous soluti... more Barium titanate powder was processed at temperature 80 °C by reacting TiO 2 sol in aqueous solutions that contained BaCl 2 and NaOH at atmospheric pressure. Well-crystallized (cubic phase), spherical barium titanate powder with average size of 35 nm was formed by this ...
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Asian Journal of Applied …, 2010
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Papers by Srimala Sreekantan