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- 저자 : S.A. Agnihotry (검색결과 3 건)
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M. Deepa,D.P. Singh,S.M. Shivaprasad,S.A. Agnihotry 한국물리학회 2007 Current Applied Physics Vol.7 No.2
A pristine acetylated peroxotungstate sol with and without 4 wt% of oxalic acid dihydrate (OAD) yielded nanocrystalline and amorphous tungsten oxide (WO3) films respectively by dip coating technique. Contrary to the expected trend, whereby, the nanostructured 4% OAD film with a triclinic modification should have shown superior electrochromic efficiency, its amorphous 0% OAD counterpart exhibits higher optical modulation and coloration efficiency at photopic wavelengths. This anomalous behavior of the amorphous 0% OAD film was correlated to a higher W5+ content in its colored state. The colored nanocrystalline 4% OAD film contained a lower proportion of the W5+ color centers. Under the same level of lithiation, while the 4% OAD film was also constituted by W4+ states, its 0% OAD counterpart did not contain any 4+ states of tungsten. X-ray photoelectron spectroscopic (XPS) investigations also confirmed that the single peak at 1.4 eV in the absorption coefficient–wavelength spectrum of the colored 0% OAD film arises from the small polaronic transitions between the W6+ and W5+ states of tungsten whereas the W6+–W5+ and the W5+–W4+ charge transitions produce two distinct peaks at 1.2 and 1.6 eV in the a–k spectrum of the colored 4% OAD film. The microstructure of the 4% OAD film, characterized by an interconnected network of nanocrystallites and pores promotes rapid ion insertion and extraction. Therefore, the larger magnitudes of NIR reflectance modulation, diffusion coefficient for lithium, electrochemical activity and faster color–bleach kinetics observed for the 4% OAD film, are a direct consequence of its structure. Band gap widening upon lithium insertion observed for both films, is a repercussion of Burstein–Moss effect and structural changes that occur upon coloration.
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Effect of nano -Al2O3 addition on ion dynamics in polymer electrolytes
Shahzada Ahmad,S.A. Agnihotry 한국물리학회 2009 Current Applied Physics Vol.9 No.1
Polymer electrolytes, which hold the key of successful operation of all solid state ionic devices, have been investigated. An amorphous polymer was used to facsimile fast ion transport in the gel polymer electrolytes (GPE) and room temperature conductivity >10-3 S/cm can be attained. Further, these electrolytes were transformed into composites by dispersing inorganic particles of -Al2O3 (11 nm in size) in varying wt.%. An enhancement in the conductivity for an optimum concentration using LiClO4 as a salt can be obtained and is described in terms of free charge carrier concentration, while the other family of Lithium salts viz. LiTf, LiIm, LiBETI decreases the conductivity marginally. FTIR spectroscopy supports the observed decrease in terms of more association between fillers and salts. It has been realized that the mechanical integrity of these composites increases manifold, without affecting the conductivity, significantly. Polymer electrolytes, which hold the key of successful operation of all solid state ionic devices, have been investigated. An amorphous polymer was used to facsimile fast ion transport in the gel polymer electrolytes (GPE) and room temperature conductivity >10-3 S/cm can be attained. Further, these electrolytes were transformed into composites by dispersing inorganic particles of -Al2O3 (11 nm in size) in varying wt.%. An enhancement in the conductivity for an optimum concentration using LiClO4 as a salt can be obtained and is described in terms of free charge carrier concentration, while the other family of Lithium salts viz. LiTf, LiIm, LiBETI decreases the conductivity marginally. FTIR spectroscopy supports the observed decrease in terms of more association between fillers and salts. It has been realized that the mechanical integrity of these composites increases manifold, without affecting the conductivity, significantly.
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Pharmacognostical Evaluation of Leucas aspera Link.
Vartika Rai,Manisha Agarwal,A.K. Agnihotri,S. Khatoon,A.K.S. Rawat,S. Mehrotra 한국생약학회 2005 Natural Product Sciences Vol.11 No.2
Leucas aspera Link. (Lamiaceae) is an important medicinal plant in indigenous systems of medicinecomunities find diverse medicinal properties. It is used as antipyretic, stimulant, expectorant and diaphoreticdrug. The present communication deals with the detailed pharmacognostical evaluation of whole plant of L.aspera collected from five different geographical zones of the country-Uttar Pradesh, Orissa, Karnataka, WestBengal and Gujarat. The botanical characters and TLC fingerprint profile of all the samples were quite similar butsome variations were observed in physicochemical parameters. However, some microscopical characters and TLCprofile can be used as diagnostic characters for identification of , for example amphistomachic leavesand two types of trichomes-abundant, non glandular, uniseriate, 1-3 celled and few glandular, 2-5 celled stalk withrounded tip. Presence of some components at Rfs-0.56, 0.65 and 0.76 under UV 366 and at Rfs-0.31, 0.43, 0.60,0.76 and 0.82 under visible light after derivetization in TLC profile may also be used as diagnostic character.
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