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Related Concept Videos

Colloidal precipitates01:09

Colloidal precipitates

4.8K
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...
4.8K
Colloids and Suspensions01:17

Colloids and Suspensions

3.0K
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...
3.0K
Colloids03:22

Colloids

20.6K
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...
20.6K
Coagulation01:06

Coagulation

1.2K
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...
1.2K
Precipitation Titration Curve: Analysis01:21

Precipitation Titration Curve: Analysis

1.7K
The precipitation titration curve demonstrates the change in concentration of one reactant with the volume of titrant added. During the titration of chloride ions with silver nitrate, the precipitation titration curve is divided into three regions: before, at, and after the equivalence point. Before the equivalence point, low redissolution of the sparingly soluble silver chloride precipitate gives a low silver ion concentration. However, in the second region, representing the equivalence point,...
1.7K
Formation of Complex Ions03:45

Formation of Complex Ions

25.6K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Related Experiment Videos

[Comparative study on SERS and stability of negative silver colloids].

Qing-yu Li1, Shi-rong Li, Min-zhen Si

  • 1Department of Basic Courses, Southwest Forestry College, Kunming 650224, China.

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|May 23, 2007
PubMed
Summary
This summary is machine-generated.

Negatively charged nano-silver colloids were synthesized and characterized for stability. Older nano-silver colloids showed red-shifted absorption spectra and altered SERS activity compared to newly prepared ones.

Related Experiment Videos

Area of Science:

  • Colloidal chemistry
  • Nanomaterials science
  • Spectroscopy

Context:

  • Negatively charged colloidal nano-silver particles were prepared using a colloidal chemical method.
  • The synthesis involved silver nitrate, tannic acid, and potassium carbonate, resulting in a stable silver sol.
  • Electrophoresis confirmed the negative charge of the colloidal silver particles.

Purpose:

  • To investigate the stability and surface-enhanced Raman scattering (SERS) properties of negatively charged nano-silver colloids over time.
  • To compare the characteristics of aged (2-year-old) nano-silver colloids (old NCS) with newly prepared ones (new NCS).
  • To determine particle size, absorption spectra, and SERS activity for different molecules.

Summary:

  • Particle size analysis revealed larger mean diameters for old NCS compared to new NCS.
  • Absorption spectra showed a 12 nm red shift for old NCS (431 nm) versus new NCS (418 nm), with a red-shift rate of approximately 0.5 nm/month.
  • SERS activity was observed for cationic (fuchsine basic, alcidine orange) and neutral (methylene blue) molecules, with variations in intensity between old and new NCS. No SERS was detected for anionic benzoic acid.

Impact:

  • The study provides insights into the aging effects on nano-silver colloid properties, particularly absorption spectra and SERS performance.
  • Findings are relevant for applications requiring stable nano-silver colloids, such as in sensing and diagnostics.
  • Understanding the stability and SERS behavior is crucial for optimizing the use of nano-silver colloids in various scientific and technological fields.