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Related Concept Videos

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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The Colloidal State01:29

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The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called...
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Colloids03:22

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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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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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Immunogold Electron Microscopy

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Immunoelectron microscopy utilizes immunogold labeling of endogenous proteins with specific antibodies to detect and localize these proteins in cells and tissues. The procedure provides insights into the distribution and quantification of protein under different stimulation conditions offering clues about their functions. Conjugating highly electron-dense gold particles with primary or secondary antibodies allow antigen detection on and within cells, with high resolution and specificity.
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In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
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Does shining light on gold colloids influence aggregation?

Susmita Bhattacharya1, Suda Narasimha2, Anushree Roy1

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Light influences the structure of gold nanoparticle aggregates, a phenomenon not previously recognized. This effect is attributed to non-uniform electric fields within the aggregates when exposed to light.

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Area of Science:

  • Colloidal science
  • Materials science
  • Nanotechnology

Background:

  • Self-assembled aggregates of gold colloidal particles are extensively studied.
  • Existing models primarily consider electrostatic, van der Waals, and ligand interactions.
  • The role of external stimuli like light has been overlooked.

Purpose of the Study:

  • To investigate the influence of light on the structural characteristics of gold colloidal particle aggregates.
  • To identify factors beyond traditional interaction models that govern aggregate morphology.

Main Methods:

  • Light scattering experiments were employed to observe aggregate behavior.
  • Imaging techniques were utilized to visualize the growth structures.
  • Analysis focused on changes induced by light exposure.

Main Results:

  • Experimental evidence demonstrates a distinct effect of light on the growth structure of gold aggregates.
  • A novel mechanism involving light-induced non-uniform electric fields is proposed.
  • This finding challenges existing assumptions about aggregate formation.

Conclusions:

  • Light plays a significant, previously unrecognized role in the self-assembly of gold nanoparticles.
  • Non-uniform electric field distribution under illumination is the key factor.
  • Future research should incorporate optical effects in models of colloidal self-assembly.