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A kind of form-stable phase change material (PCM) based on capric-lauric acid eutectic acting as the heat-absorbing material and nano silicon dioxide serving as the supportive material was prepared by sol-gel method. The optimal proportion of the capric-lauric acid eutectic in the composite was determined as 60 wt.%. By the effect of capillarity and hydrogen bonding, fatty acid eutectic can be immobilized...
Fine and ultra-fine powders are actively studied in a broad and interdisciplinary area of nanotechnology. This paper presents the complex of well-grounded solutions for direct production of nanopowders by the exploding wire method. The influence of initial conditions on the properties of powders is discussed. The basic factors are as follows: the level and the uniformity of heating, the heating rate,...
An intercalation nonlinear-optical (NLO) polyimide was synthesized by the ring-opening polyaddition of 4,4'-(Hexafluoroisopropylidene) diphthalic Anhydride (6FDA) and [(6-nitrobenzothiazol-2- yl)diazenyl]phenyl-1,3-diamine. Then, sol-gel technique was adopted, utilizing 3- aminopropyltriethoxysi- lane (APTES) and tetraethoxysilane (TEOS). The polyimide/silica hybrid material was obtained. The polyimide...
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...
This paper presents the results of the thermal, mechanical and dielectric measurements conducted on polymer nanocomposites consisting of epoxy and polyhedral oligomeric silsesquioxane (POSS). The material composites were analyzed with a scanning electron microscope (SEM), an atomic force microscope (AFM) and a transmission electron microscope (TEM). Glass transition temperatures of the composites...
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