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When a structural member undergoes plastic deformation due to bending, it is crucial to understand the position of the neutral axis and the stress distribution. This member, characterized by a single plane of symmetry, exhibits a uniform stress distribution, with negative stress above the neutral axis and positive stress below. Notably, the neutral axis does not align with the centroid of the cross-section. This misalignment is typical in cases where the cross-section is not rectangular or...
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Aggregate shape is classified based on the relative sharpness or roundness of the edges and corners. This classification includes categories like rounded, angular, elongated, and flaky, each with specific characteristics. Rounded aggregates, fully shaped by attrition, are typical of river or seashore gravel, while angular aggregates, such as crushed rock, have well-defined edges. Aggregates that are elongated and flaky are less desirable, as they can reduce the workability and strength of...
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Pappus and Guldinus's theorems are powerful mathematical principles that are used for finding the surface area and volume of composite shapes. For example, consider a cylindrical storage tank with a conical top. Finding the surface area or volume can be challenging for such complex shapes. These theorems are particularly useful in calculating the volume and surface area of such systems. Here, the cylindrical storage tank with a conical top can be broken down into two simple shapes: a...
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Mohr's circle is a crucial graphical method used to analyze plane strain by plotting strain on a set of cartesian coordinates, where the abscissa is normal strain ∈ and the ordinate is shear strain γ. Similarly to Mohr’s circle for plane stress, two points X and Y are plotted. Their coordinates are (∈x, -γXY) and (∈Y, γXY), respectively.
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Polyhedral Particles with Controlled Concavity by Indentation Templating.

Daniel W Weisgerber1, Makiko Hatori1, Xiangpeng Li1

  • 1Department of Bioengineering and Therapeutic Sciences University of California, San Francisco 1700 Fourth Street, San Francisco, California 94158, United States.

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We developed a microfluidic method to create precisely shaped microparticles with controllable concavity. These novel polyhedral microparticles enhance capture efficiency for particle-templated emulsification and improve functionality.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Biotechnology

Background:

  • Current microparticle fabrication methods lack precise control over particle geometry.
  • Tailoring microparticle shape is crucial for optimizing their performance in various applications.

Purpose of the Study:

  • To develop a microfluidic technique for fabricating polyhedral microparticles with tunable shapes and concavities.
  • To investigate the impact of particle shape on emulsification efficiency and overall functionality.

Main Methods:

  • Utilized droplet microfluidics to generate microparticles.
  • Manipulated Laplace pressure, buoyancy, and particle rheology to control shape and curvature.
  • Evaluated particle performance in particle-templated emulsification.

Main Results:

  • Successfully fabricated polyhedral microparticles with controlled diverse shapes and curvatures.
  • Demonstrated increased capture efficiency using the novel microparticles in emulsification processes.
  • Showcased potential for enhanced chemical and biological functionalities.

Conclusions:

  • The droplet microfluidic method offers unprecedented control over microparticle shape and concavity.
  • These precisely engineered microparticles significantly improve emulsification processes.
  • The developed microparticles hold promise for advanced applications in chemistry and biology.