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Related Concept Videos

Amyloid Fibrils03:03

Amyloid Fibrils

Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
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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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Origami Inspired Self-assembly of Patterned and Reconfigurable Particles
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Compression and aggregation-resistant particles of crumpled soft sheets.

Jiayan Luo1, Hee Dong Jang, Tao Sun

  • 1Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USA.

ACS Nano
|October 15, 2011
PubMed
Summary
This summary is machine-generated.

Researchers created crumpled graphene balls that resist aggregation and maintain high surface area. These stable graphene particles offer improved properties for energy storage and other applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Graphene sheets tend to aggregate and restack, limiting their properties and processability.
  • Achieving stable, high-surface-area graphene materials is crucial for applications.

Purpose of the Study:

  • To synthesize crumpled graphene balls with enhanced stability and surface area.
  • To demonstrate the superior performance of crumpled graphene in energy storage devices.

Main Methods:

  • Synthesis of crumpled graphene balls via capillary compression in evaporating aerosol droplets.
  • Characterization of particle stability, surface area, and dispersibility after various processing steps.
  • Testing performance in microbial fuel cell electrodes.

Main Results:

  • Crumpled graphene balls exhibit high free volume and compressive strength.
  • Particles are stabilized by folded, π-π stacked ridges and resist unfolding.
  • Crumpled graphene maintains 45% of its surface area after high-pressure compression, unlike flat sheets which lose 84%.
  • Crumpled graphene shows remarkable aggregation resistance in solution and solid states.
  • Crumpled graphene-based electrodes outperform flat graphene electrodes in microbial fuel cells.

Conclusions:

  • Crumpled graphene balls offer a pathway to standardized, stable graphene materials with high surface area and solution processability.
  • This approach overcomes processing history dependence and benefits bulk graphene applications.
  • The findings pave the way for improved graphene-based energy storage and conversion devices.