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Related Concept Videos

Colloids03:22

Colloids

21.7K
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...
21.7K
The Colloidal State01:29

The Colloidal State

27
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...
27
Colloidal precipitates01:09

Colloidal precipitates

6.6K
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...
6.6K
Colloids and Suspensions01:17

Colloids and Suspensions

3.7K
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...
3.7K
Coagulation01:06

Coagulation

1.5K
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...
1.5K
Pharmaceutical Alternatives: Polymorphic Form-Related and Particle Size-Related Therapeutic Nonequivalence01:27

Pharmaceutical Alternatives: Polymorphic Form-Related and Particle Size-Related Therapeutic Nonequivalence

209
Changes in polymorphic forms can significantly influence the bioavailability of poorly soluble drugs. Although the FDA defines pharmaceutical equivalence based on having the same active ingredient, dosage form, and route of administration, it does not automatically disqualify products with different polymorphic forms. This means two products with different polymorphs can still be deemed pharmaceutically equivalent. However, polymorphic differences can affect properties like wettability,...
209

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Author Spotlight: Advancing Therapeutics with Biocompatible Sodium Alginate Hydrogel Microspheres
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Colloid particle formulations for antimicrobial applications.

Ahmed F Halbus1, Tommy S Horozov1, Vesselin N Paunov1

  • 1School of Mathematics and Physical Sciences (Chemistry), University of Hull, Hull HU6 7RX, UK.

Advances in Colloid and Interface Science
|May 23, 2017
PubMed
Summary
This summary is machine-generated.

Colloidal nanoparticles offer broad-spectrum antimicrobial action against bacteria, fungi, and viruses. This review explores their preparation, mechanisms, and applications as alternatives to conventional antibiotics, addressing antimicrobial resistance.

Keywords:
Antimicrobial resistanceAntimicrobialsColloid antibodiesEnvironmentally benign nanoparticlesMetal oxide nanoparticlesNanoparticles

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Microbiology

Background:

  • Colloidal particles are extensively studied for antimicrobial applications.
  • Their small size-to-volume ratio enables a wide spectrum of action.
  • Nanoparticles (NPs) offer potential alternatives to conventional antibiotics.

Purpose of the Study:

  • To review various nanoparticles (NPs) for antimicrobial applications.
  • To discuss NP preparation methods and antimicrobial action mechanisms.
  • To highlight advances in NP functionalization and targeted delivery.

Main Methods:

  • Review of inorganic, organic, and hybrid NPs.
  • Analysis of metal oxide, metal, metal hydroxide, and hybrid NPs.
  • Discussion of targeted delivery using colloid antibodies and NP functionalization.

Main Results:

  • Various NPs (metal oxides, metals, hydroxides, hybrids) show antimicrobial activity.
  • Functionalization and targeted delivery enhance antimicrobial efficacy.
  • Environmentally benign NPs (EbNPs) offer safer alternatives.

Conclusions:

  • Nanoparticles present a viable alternative to combat antimicrobial resistance.
  • Functionalized and targeted NPs improve antimicrobial outcomes.
  • Environmentally benign NPs provide sustainable solutions for antimicrobial nanomaterials.