Nanotechnology: New Name, Old Science
Colloidal phenomena are encountered in everyday materials (polymers, plastics, and rubber, agrochemicals, pharmaceuticals and cosmeceuticals, paper, foodstuffs, fabrics, textiles, and detergents) and technologies (nucleation and precipitation, liquid crystals, chromatography and ion-exchange, flotation, and heterogeneous catalysis).
De Colloïden van Nanoparticle
Als de deeltjes groter zijn, wordt hun dynamisch gedrag binnen de opschorting geregeerd door krachten van ernst en sedimentatie. Voor kleinere deeltjes in colloïden, kan de onregelmatige motie in opschorting aan het collectieve bombardement van een horde thermaal geageerde molecules in het vloeibare het opschorten middel worden toegeschreven. Dit werd beschreven oorspronkelijk door Albert Einstein in zijn verhandeling.
Interaction between particles
There are many important criteria that must be considered when selecting gold colloid for us in any of these technologies. In all cases, a desirable material will have the following characteristics.
Because of their versatility and the numerous areas where they find application, metal nanoparticle suspensions are of great interest for industry. In particular, by virtue of their physicochemical characteristics, metal nanoparticles have important applications in various fields: biomedical, optical and electronic devices, and catalysts.
In the present study, biocompatible colloidal suspensions of magnetic iron oxide nanoparticles coated with oleic acid were prepared and characterized. There were investigated the effects of these nanoparticles both in vitro on normal cell lines —human keratinocytes (HaCat cells) and in vivo by evaluating the acute dermal toxicity after topical application of the colloidal suspensions.
What are the differences between solutions, suspensions, colloids, and pure substances in chemistry?
A solution is a homogenous mixture composed of two or more substances. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent. A suspension is a heterogeneous mixture in which the solute particles do not dissolve. A colloid is in which one substance of microscopically dispersed insoluble particles is suspended throughout another substance. Pure substances are defined as substances that are made of only one type of atom or only one type of molecule (a group of atoms bonded together).
Nanomaterials are of significant economic interest with a global market value of roughly 20 billion €, which is expected to rise to 2 trillion € by 2015 . For commercial use, the European Union provides the following recommended definition: "‘Nanomaterial’ means a natural, incidental or manufactured material containing particles, in an unbound state or as an aggregate or as an agglomerate and where, for 50% or more of the particles in the number size distribution, one or more external dimensions is in the size range 1 nm-100 nm" .
Colloidal Stabilization of Nanoparticles in Concentrated Suspensions
Abstract: Nanoparticles are defined as particles with size in the range of 1 to 100 nm at least in one of the three dimensions. Because of this very small size scale, they possess an immense surface area per unit volume, a high proportion of atoms in the surface…