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Temperature Dependent Deformation

Temperature Dependent Deformation

In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...

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Related Experiment Video

Updated: Sep 22, 2025

Shape Memory Polymers for Active Cell Culture

Shape Memory Polymers for Active Cell Culture

Published on: July 4, 2011

Light-Controlled Complex Deformation and Motion of Shape-Memory Polymers Using a Temperature Gradient.

Hongji Zhang^1,2, Hesheng Xia³, Yue Zhao¹

¹Département de Chimie, Université de Sherbrooke, Sherbrooke, Québec J1K 2R1, Canada.

ACS Macro Letters

|May 21, 2022

Summary

This summary is machine-generated.

Researchers developed a novel shape-memory polymer (SMP) using poly(ethylene oxide) and gold nanoparticles. This material utilizes a laser-induced temperature gradient for precise control over complex deformations and mechanical work.

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Last Updated: Sep 22, 2025

Shape Memory Polymers for Active Cell Culture

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Published on: October 23, 2015

Area of Science:

Materials Science
Polymer Chemistry
Nanotechnology

Background:

Shape-memory polymers (SMPs) can recover their original shape when triggered.
Photothermal effects offer a non-contact method for triggering material transformations.
Controlling localized heating in polymers is crucial for advanced applications.

Purpose of the Study:

To demonstrate a unique photothermal effect in shape-memory polymers.
To utilize gold nanoparticles (AuNPs) for controlled laser-induced heating.
To achieve precise control over polymer deformation and motion.

Main Methods:

Incorporating a small amount (0.5 wt %) of gold nanoparticles (AuNPs) into a chemically cross-linked poly(ethylene oxide) (PEO) matrix.
Utilizing the surface plasmon resonance absorption of AuNPs upon laser irradiation.
Analyzing the formation of a temperature gradient within the polymer's temporary shape.

Main Results:

Controlled absorption by AuNPs created a localized temperature gradient in the PEO.
This gradient induced anisotropic polymer chain relaxation and strain energy release.
The photoinduced temperature gradient enabled laser control over diverse deformations and mechanical work.

Conclusions:

A novel photothermal effect in SMPs was demonstrated using AuNP-loaded PEO.
Laser-induced temperature gradients offer unprecedented control over SMP shape recovery and motion.
This approach unlocks new possibilities for sophisticated actuators and programmable materials.