在线性剪切流下,自我避开的活性布朗聚合物的特征特征
Arindam Panda1, Roland G Winkler2, Sunil P Singh1
1Department of Physics, Indian Institute of Science Education and Research, Bhopal 462 066, Madhya Pradesh, India. arindam19@iiserb.ac.in.
Soft matter
|October 31, 2023
概括
活性噪声在切割流下显著改变了柔性聚合物的行为,改变了拉伸,对齐和粘度. 与被动聚合物相比,这些活性聚合物表现出不同的缩放规律,特别是在高活性和剪切速率下.
科学领域:
- 聚合物物理 聚合物物理
- 软物质物理学 软物质物理学
- 计算物理 计算物理
背景情况:
- 了解流动下的聚合物动态对于材料科学至关重要.
- 活动噪声引入了被动系统中不存在的非平衡效应.
- 排除体积相互作用在聚合物构成中起着关键作用.
研究的目的:
- 为了研究活性噪声对灵活的线性聚合物在剪切流下的行为的影响.
- 分析由于活动噪声而导致的形状和动态性质的变化.
- 将模拟结果与分析预测进行比较.
主要方法:
- 使用了布朗动力学模拟.
- 包括被排除的体积相互作用.
- 研究了不同活动和剪切速率的影响.
主要成果:
- 活动噪声减少了剪切引起的拉伸,并导致非单调的行为.
- 聚合物压缩在渐变方向的尺度为WiPe-3/4,不同于被动系统.
- 与被动聚合物相比,剪切诱导的对齐和粘度表现出不同的缩放规律.
- 观察到非单调的零剪切粘度行为随着活动的增加.
结论:
- 活性噪声从根本上改变了聚合物动力学和在剪切流下的构造.
- 这项研究揭示了剪切流中的活性聚合物新的缩放行为.
- 模拟结果与分析预测保持一致,验证了模型.
相关概念视频
Newtonian Fluid: Problem Solving
234
Newtonian fluids exhibit a constant viscosity, meaning their shear stress and shear strain rate are directly proportional. This property ensures a predictable and stable response to applied forces, maintaining a linear relationship between force and flow. Examples include water, air, and light oils, consistently demonstrating this proportional behavior regardless of external conditions.
A velocity gradient forms within the fluid when a Newtonian fluid is placed between two parallel plates, with...
A velocity gradient forms within the fluid when a Newtonian fluid is placed between two parallel plates, with...
234
Polymers: Molecular Weight Distribution
3.4K
For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
3.4K
Irrotational Flow
467
Irrotational flow is characterized by fluid motion where particles do not rotate around their axes, resulting in zero vorticity. For a flow to be irrotational, the curl of the velocity field must be zero. This imposes specific conditions on velocity gradients. For instance, to maintain zero rotation about the z-axis, the gradient condition:
467
Molecular Weight of Step-Growth Polymers
2.2K
Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
2.2K
Steady, Laminar Flow in Circular Tubes
224
Hagen-Poiseuille flow describes a viscous fluid's steady, incompressible flow through a cylindrical tube with a constant radius R. This flow profile is often applied to understand fluid transport in narrow channels, such as capillaries. It serves as a foundational example of laminar flow. In this model, cylindrical coordinates (r,θ,z) are used to describe the radial (r), angular (θ), and axial (z) dimensions within the tube. For Hagen-Poiseuille flow, the velocity profile is...
224
Viscosity
5.9K
When water is poured into a glass, it falls freely and quickly, whereas if honey or maple syrup is poured over a pancake, it flows slowly and sticks to the surface of the container. This difference in the flow of different kinds of liquids arises due to the fluid friction between the liquid layers and the liquid and the surrounding material. This property of fluids is called fluid viscosity. In this example, water has a lower viscosity than honey and maple syrup.
The SI unit of viscosity is...
The SI unit of viscosity is...
5.9K


