高性能甲基氧气凝:水解机制和最大化压缩性能
Guihua Zhang1,2, Chengdong Li1,2, Yuxiang Wang1,2
1Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China.
Gels (Basel, Switzerland)
|September 27, 2023
概括
研究人员通过控制甲基trimethoxysilane (MTMS) 水解来优化使用环境压力干燥的甲基silsesquioxane气凝. 最佳条件产生了增强的机械强度和压缩应变,这对于工业应用至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
- 化学工程是化学工程的重要组成部分.
背景情况:
- 环境压力干燥是用于气凝合成的超临界干燥的经济有效替代方案.
- 通过环境压力干燥合成的甲基酸气凝往往具有不良的机械性能.
- 了解sol-gel动力学是提高气凝性能的关键.
研究的目的:
- 为了阐明甲基氧化气凝骨的微观形成机制.
- 为了研究水解条件对气凝特性的影响.
- 优化环境压力干燥合成,以提高机械性能.
主要方法:
- 甲基trimethoxysilane (MTMS) 前体水解和sol-gel反应的动态分析.
- 氧酸度 (c_OA) 和水解时间 (t_h) 的系统变化.
- 凝时间的表征,形态,微观结构,化学结构和压缩特性.
主要成果:
- 确定了最佳的氧酸度 (38.4 mmol/L) 和水解时间 (120 分钟).
- 实现了0.170 MPa的压缩强度和61.2%的最大压缩应变.
- 证明了受控的水解会导致分支的粒子对粒子网络.
结论:
- 对MTMS水解条件的精确控制对于增强甲基氧气凝机械性能至关重要.
- 优化的合成参数允许通过环境压力干燥生产强大的气凝.
- 这些发现与工业规模生产高性能气凝有关.
相关概念视频
Aldehydes and Ketones with Water: Hydrate Formation
An oxygen-based nucleophile, like water, can undergo addition reactions with aldehydes and ketones. The reaction leads to the formation of hydrates, also referred to as 1,1-diols or geminal diols.
The formation of hydrates is a reversible reaction. Hydrate formation is influenced by steric and electronic factors accompanying the alkyl substituents on the carbonyl group: The rate of hydrate formation increases with a decrease in the number of alkyl groups attached to the carbonyl carbon. Hence,...
The formation of hydrates is a reversible reaction. Hydrate formation is influenced by steric and electronic factors accompanying the alkyl substituents on the carbonyl group: The rate of hydrate formation increases with a decrease in the number of alkyl groups attached to the carbonyl carbon. Hence,...
Production of Alcohol
Continuous fermentation is a key strategy in industrial ethanol production, particularly when efficiency, scalability, and high yields are essential. This approach allows for uninterrupted operation and optimized resource utilization. The primary feedstock, corn starch, undergoes enzymatic hydrolysis facilitated by α-amylase and glucoamylase. These enzymes break down the starch into fermentable sugars such as glucose, which are readily assimilated by fermentative microorganisms.Fermentation...


