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A novel alkoxysilane-functionalized push-pull chromophore was synthesized through a coupling reaction between a benzaldehyde-based chromophore, 4-aldehyde-4'-(N-ethyl-N-2-hydroxyethyl)aminoazobenzene (BA) and 3-isocyanatopropyltriethoxysilane (ICTES). Followed by a hydrolysis and condensation process of the resultant alkoxysilane dye and tetraethoxysilane (TEOS), hybrid inorganic-organic materials...
Telops has developed the Hyper-Cam, a rugged and compact infrared hyperspectral imager. The Hyper-Cam is based on the Fourier-transform technology yielding high spectral resolution and enabling high accuracy radiometric calibration. The Hyper-Cam has been used on the ground in several field campaigns, including the demonstration of standoff chemical agent detection. More recently, the Hyper-Cam has...
Depending on the fact that most pillared clays show poor thermal stability, the study on the synthesis of novel Si-pillared montmorillonites (Si-MMT) with high thermal stability have been carried out. Furthermore, powder X-ray diffraction (XRD), Fourier transformation infra-red spectra (FTIR), nitrogen adsorption-desorption isotherms were applied in order to study the thermal stability and mechanisms...
A nonlinear optical (NLO) active alkoxysilane chromophore (SGDR1) was successfully synthesized. A fluorinated polyimide/SGDR1 composite was prepared to improve the poor temporal stability of nonlinearity at elevated temperature for the reported poled sol-gel film. The poled composite film was characterized by FTIR, DSC, TGA and UV-Vis. Results show that the composite displays good hydrophobic properties,...
A series of the polyimide-silica NLO nanohybrid materials were synthesized from 3,3', 4,4'- Bisphenyltetracarboxylic (BPDA), 2,2-Bis(3-amino-4-hydroxyphen-yl) hexafluoropropane (6FHP), nonlinear optical (NLO) molecule 4-(N-2-Hydroxyethyl-N-methylamino)-4'-[(6-nitroben-zothiazol-2-yl)-diazenyl] azobenzene (HNBDA), coupling agent APTES and hydrolysate of TEOS via sol-gel process. The TEOS contents in...
In the present paper, a kind of polyimide/silica/alumina hybrid films based on 4,4'-oxydianiline (ODA) and pyromellitic dianhydride (PMDA) was prepared through sol-gel reaction by the hydrolysis and condensation of methyltriethoxysilane (MTEOS) and heteropropyl aluminum in the polyamic acid (PAA) solution of N, N-dimethylacetamide (DMAc). The chemical structure of the films, characterized by FT-IR,...
A new class of polyimide hybrid films with various amounts of alumina has been synthesized by the sol-gel reaction and characterized. The hybrid films were obtained by the hydrolysis and polycondensation of heteropropyl-alumina in polyamic acid (PAA) solution of N,N'-dimethylacetamide (DMAc), followed by heating to 350degC. The chemical structure, surface morphology of the composites films were characterized...
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