在振荡流下缩的合物悬浮液的聚合动力学
Maxime Liard1, Didier Lootens1, Pascal Hébraud2
1Sika Technology AG, Tüffenwies 16, 8048, Zurich, Switzerland.
The European physical journal. E, Soft matter
|June 23, 2023
概括
合体二氧化悬浮在振荡流下表现出复杂的聚合行为. 粒子聚合和分解导致弹性模量最大,受剪切和离子强度的影响.
科学领域:
- 合体和表面科学科学
- 类风病学 类风病学 类风病学
- 材料科学 材料科学 材料科学
背景情况:
- 体悬浮剂在自然界和工业中无处不在.
- 了解它们在外部力量下的聚合行为对于预测材料性质至关重要.
- 振荡流体质学是一种强大的工具,用于探测软物质中的动态过程.
研究的目的:
- 为了研究有吸引力的合化悬浮物的聚合动态.
- 分析振荡流对粒子聚合和聚合物分解的影响.
- 确定影响弹性模量随时间变化的因素.
主要方法:
- 为了研究合体二氧化悬浮液,采用了风病学测量.
- 使用振荡流来诱导和监测聚合和断裂现象.
- 弹性模量被测量为时间,剪切幅度和离子强度的函数.
主要成果:
- 由于聚合和分解之间的竞争,观察到弹性模块的非单调演变.
- 在特定条件下,弹性模量表现为最大,而不是随着时间的推移而持续增加.
- 发现弹性模量最大值的大小取决于剪切幅度和离子强度.
结论:
- 这项研究揭示了在振荡流下合体二氧化悬浮中的复杂动态行为.
- 这些发现突出了粒子聚合,聚合稳定性和外部应力之间的关键相互作用.
- 拟议的缩放定律为理解弹性模量对关键实验参数的依赖提供了一个框架.
相关概念视频
Colloids and Suspensions
1.9K
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
1.9K
Colloidal precipitates
629
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
629
Coagulation
334
Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
334
Colloids
17.6K
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
17.6K
Rapidly Varying Flow
101
Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
101


