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Related Concept Videos

Plastic Deformations01:19

Plastic Deformations

465
Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
465
Plastic Deformations01:14

Plastic Deformations

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It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
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Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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Temperature Dependent Deformation01:12

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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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Deformations in a Symmetric Member in Bending01:18

Deformations in a Symmetric Member in Bending

521
When analyzing the deformation of a symmetric prismatic member subjected to bending by equal and opposite couples, it becomes clear that as the member bends, the originally straight lines on its wider faces curve into circular arcs, with a constant radius centered at a point known as Point C. This phenomenon helps to understand the stress and strain distribution within the member more clearly.
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Shape-Selective Assembly of Anisotropic, Deformable Microcomponents Using Bottom-Up Micromanufacturing.

Gunjan Agarwal1, Carol Livermore2

  • 1Department of Mechanical Engineering, École Polytechnique Fédérale De Lausanne (Swiss Federal Institute of Technology), 1003 Lausanne, Switzerland. agarwalg@alum.mit.edu.

Micromachines
|November 9, 2018
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Summary
This summary is machine-generated.

This study demonstrates shape-selective directed assembly of non-spherical microcomponents using patterned templates. The method precisely places and aligns anisotropic microcomponents, advancing microfabrication techniques.

Keywords:
anisotropicdeformablehydrogelmicromanufacturingself-assemblysortingstop flow lithography

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Area of Science:

  • Microfluidics and Nanotechnology
  • Materials Science and Engineering
  • Biomaterials Assembly

Background:

  • Directed assembly of microcomponents is crucial for microfabrication.
  • Current methods often rely on size differences for isotropic components.
  • Anisotropic component assembly requires methods accounting for shape and size.

Purpose of the Study:

  • To model and demonstrate a shape-selective directed assembly technique for anisotropic microcomponents.
  • To control selective placement and alignment of microcomponents onto patterned templates.
  • To enable assembly based on both shape and size differences.

Main Methods:

  • Utilized shape-matching to microfabricated templates for selectivity.
  • Employed uniform chemical surface functionalization to promote assembly.
  • Applied megasonic excitation to prevent misaligned assembly.
  • Developed a theoretical framework to quantify assembly selectivity.

Main Results:

  • Successfully demonstrated directed assembly of cylindrical hydrogel microcomponents into hemicylindrical sites.
  • Showcased exclusion of tapered microcomponents from assembly sites, confirming shape selectivity.
  • Achieved high local yields consistent with theoretical predictions.
  • Validated the technique for hydrogels and biocompatible polymers.

Conclusions:

  • The developed technique enables precise, shape-selective directed assembly of anisotropic microcomponents.
  • This method overcomes limitations of isotropic component assembly by utilizing shape and size discrimination.
  • The findings represent a significant advancement in microcomponent assembly for various material combinations.