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在多模晶体和粒子组合中进行包装,作为粒子自发和强制运动期间动态包装的模型:沉,粘度和弹性

Jarl B Rosenholm¹

¹Physical Chemistry, Laboratory of Molecular Science and Engineering, Aurum Åbo Akademi University, Henriksgatan 2, 20500, Åbo, Turku, Finland.

Advances in colloid and interface science

|July 4, 2024

概括

体颗粒模拟原子结晶过程. 它们的相互作用受到DLVO模型的控制,影响悬浮特性,如粘度和凝,揭示了结构形成的洞察力.

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
物理化学物理化学

背景情况:

体粒子 (CP) 作为原子尺度过程如结晶的实验可观测模型.
体颗粒的包装,特别是当颗粒大小不同时,由于电位决定的离子,会产生排斥体积 (斯特恩和扩散层).
这些现象对于理解粒子间相互作用和宏观悬浮行为至关重要.

研究的目的:

用合物颗粒作为模型系统来建模结晶和悬浮类风湿学.
阐明排除体积,表面电荷和离子相互作用在合体行为中的作用.
为了将微观相互作用与宏观性质 (如粘度,产量应力和凝结) 联系起来.

主要方法:

利用合物颗粒作为结晶和原子尺度过程的模型系统.
应用德贾古恩-兰道-维尔韦-奥弗比克 (DLVO) 模型来描述粒子间的力.
采用风学测量 (粘度,屈服应力,振荡性风学) 来描述悬浮的特性.
分析功率定律指数和碎形维度,以了解结构形成和聚合动力学.

主要成果:

排外体积的形成 (斯特恩和扩散层) 是由离子驱动的,并决定了界面电荷.
DLVO模型有效地平衡了吸引力和排斥力的能量,影响了悬挂动态.
诸如粘度和收益应力之类的风学性质与剪切速率和相互作用能量相关.
从索尔到凝的过渡以与透和碎形维度相关的功率定律指数为特征,确定扩散有限或反应有限的集群-集群聚合.

结论:

体粒子系统为结和聚合等基本过程提供了宝贵的见解.
接口电荷,排除体积和DLVO相互作用是悬浮体质和稳定性的关键决定因素.
风湿学分析,特别是振荡性风湿学,在表征状凝中的网络形成和结构演变方面是有效的.

关键词:

弹性和sol-gel过渡的表征悬浮稳定性的依赖于 (有效的) 表面潜力和电荷密度.离子分布在尾部和扩散层中的离子分布在晶体和颗粒组合中进行包装.沉和低剪切粘度度学之间的关系松散的花和密集的凝固粒子网络的粘性弹性.

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