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Related Concept Videos

Classifying Matter by Composition03:35

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Matter: Pure Substances and Mixtures
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A pure substance is a form of matter that has a constant composition throughout with uniform properties. For example, any sample of sucrose has the same composition and same physical properties, such as melting point, color, and sweetness, regardless of the source from which it is isolated. 
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Laminins are heterotrimeric proteins with high molecular mass found in the extracellular matrix. Each laminin molecule is composed of three chains, viz. alpha, beta, and gamma, coded by five, four, and three paralogous genes, respectively. Laminins are categories based on the compositions of the three chains.
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Related Experiment Video

Updated: May 1, 2026

Synthesis and Functionalization of 3D Nano-graphene Materials: Graphene Aerogels and Graphene Macro Assemblies
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Graphene-based composite materials.

Sasha Stankovich1, Dmitriy A Dikin, Geoffrey H B Dommett

  • 1Department of Mechanical Engineering, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3111, USA.

Nature
|July 21, 2006
PubMed
Summary
This summary is machine-generated.

Researchers developed a method to create graphene-polymer composites by exfoliating graphite. These materials show exceptional electrical conductivity at low graphene concentrations, paving the way for new graphene-based applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Polymer Science

Background:

  • Graphene, a single layer of sp2-bonded carbon atoms, exhibits remarkable thermal, mechanical, and electronic properties.
  • Harnessing graphene's properties for applications requires scalable production and homogeneous dispersion in composite materials.
  • Conventional graphite does not easily exfoliate into individual graphene sheets, hindering composite fabrication.

Purpose of the Study:

  • To present a general approach for preparing graphene-polymer composites.
  • To achieve complete exfoliation of graphite and molecular-level dispersion of graphene sheets.
  • To explore the potential of these composites for various applications.

Main Methods:

  • Complete exfoliation of graphite to yield individual graphene sheets.
  • Chemical modification of graphene sheets for improved dispersion.
  • Incorporation of modified graphene into polymer matrices (e.g., polystyrene).

Main Results:

  • A polystyrene-graphene composite demonstrated a percolation threshold as low as 0.1 volume percent for electrical conductivity.
  • At 1 volume percent graphene, the composite achieved a conductivity of 0.1 S m(-1), suitable for many electrical applications.
  • The developed method enables a broad range of graphene-based materials with tunable properties.

Conclusions:

  • A novel bottom-up chemical approach facilitates the creation of high-performance graphene-polymer composites.
  • The low percolation threshold highlights the efficiency of dispersed graphene in enhancing composite conductivity.
  • This work opens avenues for the widespread application of graphene in advanced materials.