相关实验视频

Updated: Apr 6, 2026

Microbubble Fabrication of Concave-porosity PDMS Beads

Microbubble Fabrication of Concave-porosity PDMS Beads

Published on: December 15, 2015

皮克林的独特结晶特征高内部相乳液模板化的多孔构造

Meenal Agrawal¹, Bhanu Nandan¹, Rajiv K Srivastava¹

¹Department of Textile and Fibre Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, Delhi 110016, India.

Langmuir : the ACS journal of surfaces and colloids

|February 19, 2024

概括

这项研究研究了在多孔纳米复合材料中的聚-ε-烯酸盐 (PCL) 结晶. 孔隙性和交联性显著抑制了PCL链的移动性和改变了结晶行为,影响了潜在的储能应用.

科学领域:

材料科学材料科学材料科学
聚合物科学聚合物科学
纳米技术纳米技术

背景情况:

了解聚合物结晶对于材料性能至关重要.
孔隙性和纳米颗粒含量可以显著影响聚合物链动态.
聚乙 (PCL) 是一种多用途的可生物降解聚合物,在储能方面具有潜在的应用.

研究的目的:

在无孔和有孔的纳米复合材料结构中研究聚乙烯 (PCL) 的结晶行为.
阐明多孔性,交联和改性烟纳米颗粒 (mSiNP) 对PCL热特性和结晶动力学的影响.
探索这些PCL结构作为储能材料的潜力.

主要方法:

通过皮克林高内部相乳液 (HIPEs) 制造多孔交联PCL纳米复合材料结构,该乳液由mSiNP稳定.
差分扫描热量计 (DSC) 用于分析热性能和结晶行为.
用X射线衍射 (XRD) 来研究晶体结构的变化.
在非异热条件下使用Jeziorny,Ozawa和Mo理论评估结晶动力学.

主要成果:

交叉链接和mSiNP在无孔PCL结构中的包含降低了结晶温度和动力学,表明聚合物链的移动性受到了抑制.
孔隙的引入导致了显著的超冷却,结晶温度低至-24°C.
多孔结构表现出复杂的结晶机制,偏离理论模型,受链不动性和壁厚异质性的影响.

结论:

孔隙性和交叉连接显著影响PCL结晶行为,导致复杂的机制.
在这些PCL纳米复合材料中观察到的融化结晶现象表明了储能应用的潜力.
对类似高热容量系统的进一步研究可以扩大它们在热能存储中的实用性.

更多相关视频

Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes

Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes

Published on: August 16, 2018

Particle Templated Emulsification enables Microfluidic-Free Droplet Assays

Particle Templated Emulsification enables Microfluidic-Free Droplet Assays

Published on: March 9, 2021

相关概念视频

Recrystallization: Solid–Solution Equilibria

Recrystallization: Solid–Solution Equilibria

Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...

Crystal Growth: Principles of Crystallization

Crystal Growth: Principles of Crystallization

Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...