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通过X射线相对应光子谱学探测纤维素纳米晶体的自组装动力学

Jiajun Tian¹, Ahmad Reza Motezakker², Ruifu Wang¹

¹Department of Chemistry, Stony Brook University, Stony Brook, NY 11794-3400, United States.

Journal of colloid and interface science

|January 8, 2025

概括

纤维素纳米晶体 (CNCs) 自组装成液晶相,在过渡过程中表现出不同的动态. 射线光子相关谱 (XPCS) 直接测量了这些动态,揭示了粒子运动的显著减速.

科学领域:

合体和表面科学科学
材料科学材料科学材料科学
生物材料是一种生物材料.

背景情况:

纤维素纳米晶体 (CNCs) 是从生物质中衍生出来的,并表现出独特的自我组装特性.
电荷稳定型CNC可以根据度形成奇拉性阴性液晶相.
了解CNC自组装的动态对于材料设计至关重要.

研究的目的:

为了研究纤维素纳米晶体 (CNCs) 在自组装成合性内马特结构时的动态行为.
通过X射线光子相关谱学 (XPCS) 阐明相位过渡.
为了将实验动态与合棒模拟进行比较.

主要方法:

在甘醇 (PG) 和水中以各种体积分数分散阳离子CNC.
使用X射线光子相关谱学 (XPCS) 来监测相位动态.
将实验XPCS数据与合棒模型的模拟结果进行比较.

主要成果:

数控机的粒子动力学表明,在PG的自组装过程中,在PG中发生了三阶段的渐进衰变.
阶段过渡与布朗扩散速率下降的四个数量级相关.
动力学对于理想的排斥布朗杆来说比预测要慢得多.

结论:

该研究提供了液晶相转换期间CNC动态的直接XPCS测量.
在PG中观察到的动态行为表明,在其他极性溶剂 (如水) 中也有类似的行为.
XPCS是一种可行的技术,用于研究棒状体悬浮物的动力学.

关键词:

纤维素纳米晶纤维素纳米晶动力学动力学动力学阶段过渡阶段过渡阶段过渡自动组装自动组装射线相对应光子光谱X射线相对应光谱

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