相关实验视频
Updated: Jun 30, 2025

12:04
Microfluidic Preparation of Liquid Crystalline Elastomer Actuators
Published on: May 20, 2018
9.0K
异构液晶弹性体的弹性热量反应
Jeremy A Herman1, Jonathan D Hoang2, Timothy J White1,2
1Department of Chemical and Biological Engineering, University of Colorado, Jennie Smoly Caruthers Biotechnology Building, 3415 Colorado Ave, Boulder, CO, 80303, USA.
Small (Weinheim an der Bergstrasse, Germany)
|March 20, 2024
概括
新的液晶弹性体 (LCE) 显示出显著的弹性热效应,以最小的力达到超过±3°C的温度变化. 这一突破为先进的固态冷却应用提供了潜力.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物化学 聚合物化学
- 热力学是一种热力学.
背景情况:
- 液晶弹性体 (LCEs) 将材料秩序与变形联系起来.
- 弹性热效应,即由于机械应力的温度变化,是固态制冷剂的关键.
- 之前的LCE研究报告说,在高压力下,温度变化很小 (≈2°C).
研究的目的:
- 为了研究新型LCEs的弹性热量反应,与下环境的阴性到异性热的过渡温度.
- 开发具有增强弹性回收和减少歇斯底里作用的LCE,以提高制冷剂性能.
- 探索这些专门的LCE中变形,秩序和温度变化之间的关系.
主要方法:
- 合成LCEs使用两步的醇-迈克尔/醇-反应,以获得卓越的网络特性.
- 通过测量变形和恢复周期期间的温度变化来表征弹性热量效应.
- 量化变形所需的力,并计算响应力.
主要成果:
- 合成的LCE显示了超过±3°C的显著弹性热量温度变化 (总 ΔT为6°C).
- 用非常低的力 (<<1 MPa) 实现了变形.
- 记录了14°CMPa-1的高反应率,比天然大七倍.
结论:
- 开发的 开发的 开发的
- 是同位素型的同位素.
- 在低施加力的情况下,LCE 具有显著的弹性热量效应.
- 增强的网络化学提供了卓越的弹性恢复和减少的歇斯底里.
- 这些LCE代表了高效固态冷却技术的有希望的进步.
相关概念视频
Members Made of Elastoplastic Material
97
The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
As the bending moment...
As the bending moment...
97
Polymer Classification: Crystallinity
2.8K
Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
2.8K
Elastic Strain Energy for Shearing Stresses
185
As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
185
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity
265
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
265
Elastic Strain Energy for Normal Stresses
158
Strain energy quantifies the energy stored within a material due to deformation under loading conditions, a fundamental concept in materials science and engineering. The strain energy can be modeled when a material is subjected to axial loading with uniformly distributed stress. In this scenario, the stress experienced by the material is the internal force divided by the cross-sectional area, and the strain induced is directly proportional to this stress through the modulus of elasticity.
If...
If...
158
Circular Shafts - Elastoplastic Materials
102
The study of solid circular shafts under stress shows that within the elastic limit, stress increases directly to the distance from the shaft's center. This relationship holds until the shaft reaches a critical point of stress, beyond which it begins to yield, marking the transition from elastic to plastic deformation. At this crucial juncture, the maximum torque the shaft can endure without permanent deformation is determined, signifying the limit of its elastic behavior.
As torque on the...
As torque on the...
102

