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相关概念视频

Colloids03:22

Colloids

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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...
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¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
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Colloids and Suspensions01:17

Colloids and Suspensions

3.5K
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...
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Colloidal precipitates01:09

Colloidal precipitates

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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...
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Fast Decoupled and DC Powerflow01:24

Fast Decoupled and DC Powerflow

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The fast decoupled power flow method addresses contingencies in power system operations, such as generator outages or transmission line failures. This method provides quick power flow solutions, essential for real-time system adjustments. Fast decoupled power flow algorithms simplify the Jacobian matrix by neglecting certain elements, leading to two sets of decoupled equations:
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Elasticity01:12

Elasticity

5.0K
Elasticity is the ability of an object to withstand the effects of distortion and to return to its original size and shape once the forces causing deformation are removed. When an elastic material deforms under the action of an external force, it experiences internal resistance to the deformation. However, if no external force is applied, it returns to its original state.
The elasticity of an object can be described by a stress-strain curve, which represents the relationship between stress...
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相关实验视频

Updated: Feb 8, 2026

Fast and Sensitive Colloidal Coomassie G-250 Staining for Proteins in Polyacrylamide Gels
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Fast and Sensitive Colloidal Coomassie G-250 Staining for Proteins in Polyacrylamide Gels

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在同位素压缩下,体凝的脱结构和弹性.

M Milani1, E Cavalletti1, V Ruzzi1

  • 1Laboratoire Charles Coulomb (L2C), Université Montpellier, CNRS, Montpellier, France.

Physical review letters
|February 6, 2026
PubMed
概括

控制干燥的合体微分凝揭示机械性能仅取决于合体体积分数,而不是干燥史. 然而,微观结构保留了压缩的记忆,挑战了现有的材料科学范式.

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科学领域:

  • 软物质物理学 软物质物理学
  • 材料科学 材料科学 材料科学
  • 结合体科学 结合体科学

背景情况:

  • 体碎形凝表现出复杂的机械行为.
  • 了解微观结构和机械性能之间的关系对于软材料至关重要.
  • 干燥诱导的压缩是形成这些凝的常见方法.

研究的目的:

  • 为了研究用受控干燥方法对合式碎形凝的同源压缩.
  • 确定干燥应力如何影响凝力学和微观结构.
  • 探索机械反应和结构性记忆之间的关系.

主要方法:

  • 控制干燥的毫米大小的凝珠.
  • 动态光散射 (DLS) 用于测量机械性能.
  • 小角度X射线散射 (SAXS) 来探测微观结构.

主要成果:

  • 干燥引起的应力均传播,导致塑料重新排列.
  • 模和产量应力仅取决于合体体积分数 (φ),独立于干燥历史.
  • 凝微结构保留了初始状态和压缩路径的记忆,与机械性能不同.

结论:

  • 合式碎形凝的机械特性和微观结构被解.
  • 这些发现挑战了这些材料结构和弹性之间的直接联系.
  • 打开了软材料结构和机械特性独立控制的可能性.