本文研究了明胶胶凝过程中的流变力学性质,发现粘滞系数η与切速 r 有幂律关系;在胶凝发展过程中,指数 n 从0逐渐变化到胶凝点 x=-1/2.还发现η按∈^(-k)发散,在 f=0.005Hz 条件下,实验测得 k=1.48,而幂律发散范围为0.1—0.2≤∈≤0.6—...本文研究了明胶胶凝过程中的流变力学性质,发现粘滞系数η与切速 r 有幂律关系;在胶凝发展过程中,指数 n 从0逐渐变化到胶凝点 x=-1/2.还发现η按∈^(-k)发散,在 f=0.005Hz 条件下,实验测得 k=1.48,而幂律发散范围为0.1—0.2≤∈≤0.6—0.7,随着浓度增加,幂律发散范围减小。展开更多
An improved bulk sol-gel process was found to prepare transparent, non-cracking, highly pure and mono-component monolithic silica gels with a low volume shrinkage. HSi（OC2H5）3 was used as a gel acceleration to short...An improved bulk sol-gel process was found to prepare transparent, non-cracking, highly pure and mono-component monolithic silica gels with a low volume shrinkage. HSi（OC2H5）3 was used as a gel acceleration to shorten the whole sol-gel processing time in the place of the carbonate powders in bulk sol-gel process. The mono-component silica gel monoliths prepared via the improved bulk sol-gel process possess a microporous structure and a good transmittance in the UV-Vis region, and the mass fraction of silica is 89%, the mass fraction of small molecules is 11%.展开更多
文摘本文研究了明胶胶凝过程中的流变力学性质,发现粘滞系数η与切速 r 有幂律关系;在胶凝发展过程中,指数 n 从0逐渐变化到胶凝点 x=-1/2.还发现η按∈^(-k)发散,在 f=0.005Hz 条件下,实验测得 k=1.48,而幂律发散范围为0.1—0.2≤∈≤0.6—0.7,随着浓度增加,幂律发散范围减小。
文摘An improved bulk sol-gel process was found to prepare transparent, non-cracking, highly pure and mono-component monolithic silica gels with a low volume shrinkage. HSi（OC2H5）3 was used as a gel acceleration to shorten the whole sol-gel processing time in the place of the carbonate powders in bulk sol-gel process. The mono-component silica gel monoliths prepared via the improved bulk sol-gel process possess a microporous structure and a good transmittance in the UV-Vis region, and the mass fraction of silica is 89%, the mass fraction of small molecules is 11%.
