相关实验视频

Updated: Jan 14, 2026

Nanoscale Characterization of Liquid-Solid Interfaces by Coupling Cryo-Focused Ion Beam Milling with Scanning Electron Microscopy and Spectroscopy

Nanoscale Characterization of Liquid-Solid Interfaces by Coupling Cryo-Focused Ion Beam Milling with Scanning Electron Microscopy and Spectroscopy

Published on: July 14, 2022

双链冷凝:通过小角度中子散射探测结时的纳米结构进化

Rosangela Mastrangelo¹, Iris Belfiore¹, Davide Tocco¹

¹Department of Chemistry, University of Florence, Via della Lastruccia 3, Sesto Fiorentino, Florence 50019, Italy; Center for Colloid and Surface Science, CSGI, Via della Lastruccia 3, Sesto Fiorentino, Florence 50019, Italy.

Journal of colloid and interface science

|October 18, 2025

概括

由两个聚乙烯醇 (PVA) 制成的双链 (TC) 冰凝,在冷过程中形成独特的海绵状结构. 它们的凝动力学不同于单聚合物溶液,受度和分子量的影响.

科学领域:

聚合物科学聚合物科学
材料科学材料科学材料科学
生物材料工程生物材料工程

背景情况:

双链 (TC) 冰凝利用两个聚乙醇 (PVA) 和相分离以获得类似海绵的形态.
这种形态增强了粘附和流体运输,对于艺术保存,化品和药物输送中的应用至关重要.
之前的研究集中在单聚合物PVA溶液中的结效应上,使TC凝动力学未被探索.

研究的目的:

通过小角度中子散射 (SANS) 来研究TC溶液的凝动力学和冷结构.
了解在冷过程中纳米级域和网格大小的演变.
为了比较TC溶液的凝行为与同质的PVA溶液.

主要方法:

利用小角度中子散射 (SANS) 来监测在冷结构和凝过程中的TC溶液.
随着时间的推移获得的散射信号,以观察纳米级域的演变.
分析了PVA结晶体 (物理交叉链) 的形成和网格大小.

主要成果:

一般来说,TC凝比同质PVA溶液的凝速度慢.
与单聚合物系统相比,冷过程导致不同尺寸的纳米级域的形成.
凝动力学取决于聚合物度,分子量和链链相互作用.

结论:

与同质的PVA溶液相比,TC凝表现出不同的特征,主要是由于液-液相分离.
观察到的动力学和域形成的差异对于优化TC冷凝特性至关重要.
了解这些因素可以为特定应用量身定制TC冷凝的设计.

关键词:

与焦点相对应的激光扫描显微镜.化化化化.阶段分离的阶段分离.没有SANS,就没有SANS.双链凝是一种双链凝.

更多相关视频

Cryogenic Sample Loading into a Magic Angle Spinning Nuclear Magnetic Resonance Spectrometer that Preserves Cellular Viability

Cryogenic Sample Loading into a Magic Angle Spinning Nuclear Magnetic Resonance Spectrometer that Preserves Cellular Viability

Published on: September 1, 2020

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

相关概念视频

Cryo-electron Microscopy

Cryo-electron Microscopy

Conventional electron microscopy (EM) involves dehydration, fixation, and staining of biological samples, which distorts the native state of biological molecules and results in several artifacts. Also, the high-energy electron beam damages the sample and makes it difficult to obtain high-resolution images. These issues can be addressed using cryo-EM, which uses frozen samples and gentler electron beams. The technique was developed by Jacques Dubochet, Joachim Frank, and Richard Henderson, for...

Phase Transitions: Melting and Freezing

Phase Transitions: Melting and Freezing

Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...