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相关概念视频

Colloids03:22

Colloids

21.0K
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...
21.0K
Colloids and Suspensions01:17

Colloids and Suspensions

3.4K
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...
3.4K
Pulse amplitude and quality01:17

Pulse amplitude and quality

3.1K
Pulse amplitude is a crucial indicator of cardiac health because it provides valuable insights into the strength of left ventricular contractions and the overall uniformity of blood circulation within the vasculature. The strength of the pulse is directly related to the force with which the heart contracts and the volume of blood being pumped.
A weak or absent pulse may indicate reduced cardiac output or poor left ventricular contraction, which can be signs of cardiovascular dysfunction or...
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Colloidal precipitates01:09

Colloidal precipitates

6.5K
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...
6.5K
Dynamic Equilibrium02:20

Dynamic Equilibrium

62.4K
A reversible chemical reaction represents a chemical process that proceeds in both forward (left to right) and reverse (right to left) directions. When the rates of the forward and reverse reactions are equal, the concentrations of the reactant and product species remain constant over time and the system is at equilibrium. A special double arrow is used to emphasize the reversible nature of the reaction. The relative concentrations of reactants and products in equilibrium systems vary greatly;...
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Gene Flow02:39

Gene Flow

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Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.
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在大振幅振荡式延伸流下体杆动力学.

Steffen M Recktenwald1, Vincenzo Calabrese1,2, Amy Q Shen1

  • 1Micro/Bio/Nanofluidics Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan. simon.haward@oist.jp.

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概括
此摘要是机器生成的。

我们研究了纤维素纳米晶 (CNC) 棒如何在变化的流动中对齐. 非线性反应发生在高流速和快速变化的情况下,影响了诸如薄膜造等工业过程的预测.

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科学领域:

  • 合体和聚合物科学 聚合物科学
  • 流体动力学 流体动力学
  • 材料科学 材料科学 材料科学

背景情况:

  • 了解体棒动力学对于材料加工至关重要.
  • 短暂的流量显著影响粒子的方向.
  • 纤维素纳米晶体 (CNC) 是模拟棒状的合体.

研究的目的:

  • 为了研究时间依赖平面延伸流下的合棒的方向动力学.
  • 将实验结果与单分散和多分散系统的理论模型进行比较.
  • 为优化涉及棒状合物的工业流程提供见解.

主要方法:

  • 使用微流体装置将受控的,时间依赖的延伸流应用于CNC悬挂.
  • 采用定量流量诱导的双断率来测量CNC定向动态.
  • 执行了单分散和多分散系统的模拟,匹配旋转扩散系数.

主要成果:

  • 由于粒子对齐,在更高的Péclet数 (Pe0) 上观察到非线性双折响应.
  • 在较高的Deborah数 (De) 中鉴定了不对称的反应和残留效应,这是由于棒的响应时间有限.
  • 在实验和多分散模拟之间实现了半定量一致,特别是对于较长的CNC棒.

结论:

  • 这项研究阐明了模块化流量中的合棒的复杂定向行为.
  • 这些发现突显了Péclet和Deborah数在决定体动态学中的重要性.
  • 结果有助于预测和优化棒状材料在纤维线和薄膜造等短暂加工流程中的行为.