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Related Concept Videos

Colloids03:22

Colloids

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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 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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The Sense of Self: Reflected Self-Appraisal and Social Comparison02:57

The Sense of Self: Reflected Self-Appraisal and Social Comparison

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According to Charles Cooley, we base our image on what we think other people see (Cooley 1902). We imagine how we must appear to others, then react to this speculation. We don certain clothes, prepare our hair in a particular manner, wear makeup, use cologne, and the like—all with the notion that our presentation of ourselves is going to affect how others perceive us. We expect a certain reaction, and, if lucky, we get the one we desire and feel good about it. But more than that, Cooley...
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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

5.9K
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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Reflection of Waves01:07

Reflection of Waves

4.5K
When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...
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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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Related Experiment Video

Updated: Jan 23, 2026

Tangential Flow Ultrafiltration: A “Green” Method for the Size Selection and Concentration of Colloidal Silver Nanoparticles
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Tangential Flow Ultrafiltration: A “Green” Method for the Size Selection and Concentration of Colloidal Silver Nanoparticles

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Robust Assembly of Colloidal Nanoparticles for Controlled-Reflectance Surface Construction.

Wenyu Jiang1,2, Yanhong Ma1, Jian Zhao3

  • 1CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience , National Center for Nanoscience and Technology , Beijing 100190 , P. R. China.

ACS Applied Materials & Interfaces
|June 13, 2019
PubMed
Summary

Researchers developed a method for precisely assembling nanoscale particles onto aluminum surfaces using porous anodic alumina templates. This technique enables large-area, high-density particle integration for tunable surface colors and reflectance.

Keywords:
colloidal nanoparticlesplasmonic couplingporous anodic aluminastructural colorstemplated assembly

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Creating Sub-50 Nm Nanofluidic Junctions in PDMS Microfluidic Chip via Self-Assembly Process of Colloidal Particles
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Creating Sub-50 Nm Nanofluidic Junctions in PDMS Microfluidic Chip via Self-Assembly Process of Colloidal Particles
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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Controlled assembly of nanoscale particles is crucial for developing advanced functional nanodevices.
  • Existing methods often lack precision, scalability, or efficiency for large-area applications.

Purpose of the Study:

  • To report a robust method for assembling colloidal nanoparticles onto nanostructured aluminum surfaces with high precision and yield.
  • To demonstrate the tunability of surface reflectance and color through nanoparticle assembly.

Main Methods:

  • Utilizing porous anodic alumina (PAA) membranes on textured aluminum substrates.
  • Employing capillary force and geometric confinement for rapid nanoparticle transfer into PAA templates.
  • Integrating top-down control with bottom-up assembly principles.

Main Results:

  • Achieved large-area (>1 cm²) integration of nanoparticles with high yield (>95%) and density (>10¹⁰ particles/cm²).
  • Observed tunable plasmonic coupling between gold nanoparticles and aluminum surfaces, and between adjacent nanoparticles.
  • Demonstrated facile shifting of reflectance minimum from visible to near-infrared, enabling broad manipulation of apparent surface colors.

Conclusions:

  • The developed method provides a straightforward platform for constructing surfaces with controlled reflectance.
  • This approach facilitates the creation of functional nanodevices and surfaces with tailored optical properties.
  • The high precision and scalability open avenues for novel photonic and optoelectronic applications.