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纤维素纳米纤维与纳米晶:悬浮剂和水凝的风学
Alexander S Ospennikov1, Alexander L Kwiatkowski1, Olga E Philippova1
1Physics Department, Lomonosov Moscow State University, 119991 Moscow, Russia.
Gels (Basel, Switzerland)
|November 26, 2025
概括
纤维素纳米纤维 (CNFs) 和纤维素纳米晶体 (CNCs) 呈现出不同的质行为. 在相同重量度下,CNF表现出更高的粘度,而在相同纳米粒子度下,CNC表现出更高的粘度,突出了它们对材料应用的独特特性.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物科学 聚合物科学
- 类风病学 类风病学 类风病学
背景情况:
- 植物衍生的纳米纤维素颗粒,包括纤维素纳米纤维素 (CNF) 和纤维素纳米晶体 (CNC),在各种应用中越来越突出.
- 选择CNF和CNC作为质修饰剂或填充剂可能是具有挑战性的,因为它们的特性不同.
研究的目的:
- 为了比较分析具有相同表面化学和电荷密度的碳氧甲基化CNF和CNC的质特性.
- 为了研究这些纳米纤维素悬浮物的凝点和交叉连接行为.
主要方法:
- 在不同度下测量CNF和CNC悬浮液和凝的风学测量.
- 对于未交叉连接的悬浮液的凝点的确定.
- 异热定位热量计用于研究离子交联的热力学.
- 在剪切引起的破坏后,水凝回收的分析.
主要成果:
- 由于纤维纠较长,CNF悬浮物在相同重量度下表现出更高的粘度和储存模量.
- 在相对于C*的等纳米粒子度下,CNC悬浮显示出更高的粘度和储存模量,这是由于其刚性.
- CNF悬浮液的凝点发生在明显低于CNC悬浮液的度.
- 离子交联对于CNF和CNC都是内热和驱动的.
- 与CNF相比,CNC水凝在添加CaCl2时显示出储存模块的大幅增加.
- 在剪切中断后,CNF和CNC水凝都表现出快速,可逆的粘度恢复,CNF网络的恢复速度更快.
结论:
- 在CNF和CNC之间做出选择,关键取决于应用的度基础 (重量与纳米颗粒度).
- 纳米纤维素水凝表现出有希望的自我愈合特性,具有快速的粘度恢复,有利于涉及高剪力加工应用.
- CNF和CNC之间的热力学和热学差异为量身定制的材料设计提供了明显的优势.
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