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Related Concept Videos

Colloids03:22

Colloids

20.9K
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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Colloids and Suspensions01:17

Colloids and Suspensions

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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
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Colloidal precipitates01:09

Colloidal precipitates

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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Protein Complex Assembly02:41

Protein Complex Assembly

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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.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
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Protein Complex Assembly02:41

Protein Complex Assembly

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Spindle Assembly02:50

Spindle Assembly

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Spindle assembly occurs through three, often coexisting, pathways – the centrosome-mediated pathway, the chromatin-mediated pathway, and the microtubule-mediated pathway – collectively contributing to form a robust spindle apparatus.
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Large-Area 3D Hierarchical Superstructures Assembled from Colloidal Nanoparticles.

Guofen Song1, Jinghan Li1, Yang Yuan1

  • 1State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.

Small (Weinheim an Der Bergstrasse, Germany)
|April 3, 2019
PubMed
Summary
This summary is machine-generated.

Researchers assembled diverse nanosized building blocks into centimeter-sized 3D superstructures using butterfly wings as templates. This novel method enhances surface-enhanced Raman scattering (SERS) performance, offering a versatile route for advanced nanomaterial construction.

Keywords:
3D assemblyhierarchical structuresnanosized particlessteric hindrancesurface-enhanced Raman scattering

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Assembling nanoscale building blocks into large-scale 3D structures is a significant challenge in materials science.
  • Controlling nanoparticle assembly is crucial for developing functional nanomaterials with tailored properties.

Purpose of the Study:

  • To develop a versatile method for assembling various nanosized building blocks into centimeter-sized 3D hierarchical structures.
  • To investigate the impact of steric hindrance on nanoparticle assembly and its effect on surface-enhanced Raman scattering (SERS) performance.

Main Methods:

  • Utilized butterfly wings as templates for directed self-assembly of nanosized metal and semiconductor building blocks (spheres, stars, rods).
  • Introduced steric hindrance during assembly to control nanoparticle interactions and prevent aggregation.
  • Fabricated hierarchical assemblies ranging from nanometer to micrometer scales.

Main Results:

  • Successfully assembled diverse nanosized building blocks into centimeter-sized 3D functional material assemblies.
  • Demonstrated that Au nanostar assemblies exhibit significantly enhanced SERS performance compared to Au nanosphere assemblies and commercial substrates across multiple excitation wavelengths.
  • Achieved SERS enhancements of 3.1-4.4, 3.6-3.9, and 2.9-47.3 folds for Au nanostars over Au nanospheres and commercial SERS substrates, respectively.

Conclusions:

  • The butterfly wing-templated assembly method with steric hindrance offers a versatile route for creating complex 3D nanomaterial superstructures.
  • This approach facilitates the construction of hybrid nanomaterials and nanocomposites with superior SERS capabilities.
  • The findings open new avenues for fabricating advanced functional materials for sensing and other applications.