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Distributed Loads01:19

Distributed Loads

Distributed loads are a common type of load that engineers and scientists encounter in various practical situations. Distributed loads often refer to a type of load spread over a surface or a structure and can be modeled as continuous force per unit area.
For example, consider a bookshelf filled with books stacked vertically adjacent to each other. The weight of the books is evenly distributed over the length of the shelf. As a result, the pressure at different locations on the surface of the...
Work and Energy for Variable Forces01:10

Work and Energy for Variable Forces

When an object is acted upon by a variable force, the amount of work done and the change in energy of the object can be more complex to calculate compared to when a constant force is applied. Work is the product of force and displacement, while energy is the capacity of a system to do work. When a constant force is applied to an object, the work done can be calculated as the product of the force and the distance moved in the direction of the force. However, when a variable force is applied, the...
Transformation of Plane Stress01:18

Transformation of Plane Stress

Studying stress transformation is essential in understanding how stress components within a material, like a cube under plane stress, change with rotation. This change is analyzed by considering a prismatic element within the cube. As the element rotates, the stress components acting on it—both normal and shearing stresses—change in magnitude and orientation. This change is quantified using trigonometric functions of the rotation angle, relating the forces acting on the rotated element's faces...
Elastic Strain Energy for Normal Stresses01:22

Elastic Strain Energy for Normal Stresses

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...
Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

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...
Fast Decoupled and DC Powerflow01:24

Fast Decoupled and DC Powerflow

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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Related Experiment Video

Updated: Jun 24, 2026

A Simple and Scalable Fabrication Method for Organic Electronic Devices on Textiles
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A Simple and Scalable Fabrication Method for Organic Electronic Devices on Textiles

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Damage-free dry transfer method using stress engineering for high-performance flexible two- and three-dimensional

Yoonsoo Shin1,2, Seungki Hong1,2, Yong Chan Hur3

  • 1Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul, Republic of Korea.

Nature Materials
|June 21, 2024
PubMed
Summary
This summary is machine-generated.

A novel dry transfer printing method uses stress-controlled metal films to enable damage-free fabrication of flexible and stretchable electronic devices. This technique overcomes limitations of current methods, paving the way for commercialization.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electronics Engineering

Background:

  • Advanced transfer printing is crucial for high-performance flexible and stretchable devices in fields like soft electronics and bioelectronics.
  • Current methods face challenges including toxic chemicals, high costs, film damage, and difficulty with high-temperature processing.
  • A new, safer, and more efficient transfer printing process is essential for commercializing soft electronic devices.

Purpose of the Study:

  • To develop a damage-free dry transfer printing strategy for fabricating high-performance flexible and stretchable electronic devices.
  • To address the limitations of existing transfer printing technologies, such as safety concerns and film damage.
  • To enable the integration of various thin films, including high-temperature-treated oxides, onto flexible substrates.

Main Methods:

  • Deposition of stress-controlled metal bilayer films using direct current magnetron sputtering.
  • Application of mechanical bending to induce film release by increasing overall stress.
  • Utilizing experimental and simulation studies to understand stress evolution during the transfer process.

Main Results:

  • Successful damage-free transfer of metal thin films onto flexible and stretchable substrates.
  • Successful transfer of high-temperature-treated oxide thin films using the developed method.
  • Demonstrated fabrication of both two-dimensional flexible electronic devices and three-dimensional multifunctional devices.

Conclusions:

  • The proposed stress-controlled dry transfer printing strategy offers a damage-free and efficient alternative to existing methods.
  • This technique overcomes key challenges, facilitating the commercialization of advanced soft electronic devices.
  • The method's versatility in transferring various thin films enables the creation of complex flexible and 3D electronic systems.