2002年10月1日 · In precipitation processes a chemical reaction produces a sparingly soluble product which starts to precipitate as a solid via nucleation and growth. As a rule, the newly precipitated primary particles are in the nanometer size range. The behaviour of colloidal particles in this size range is governed by interfacial forces.

Condensation of small dissolved molecules into larger colloidal particles by precipitation, condensation, or redox reactions. Such processes are used in the preparation of colloidal silica or gold .

2021年11月20日 · We report results on the precipitation of FeCl 2 with Na 2 S, Na 2 CO 3, Na 2 HPO 4, and electroless reduction of HAuCl 4 with NaBH 4 to understand the interplay between precipitation and fluid dynamics at the solution-solution boundary of reactant streams in a microchannel. We find that colloids increase the effective viscosity of the solution ...

2017年12月27日 · The main difference between colloidal precipitate and crystalline precipitate is that colloidal precipitates do not form easily and are difficult to be obtained via filtering whereas crystalline precipitates are easily formed and are easily obtained via filtering.

2024年5月17日 · Periodic precipitation is an emblematic example of reaction–diffusion patterns, in which the process generates a spatial periodic structure in porous media. Here, we use the dormant reagent method to produce colloidal particles of Prussian blue (PB) and PB analogues at the liquid–gel interface.

2016年4月5日 · Surface precipitation increases the complexity of surface charging and can qualitatively change the behaviour of colloidal particles in electrolyte solutions. Models that allow for a quantification of surface precipitation are, e.g., discussed by Farley et al. and Kuan et al. .

The formation of a colloidal suspension can be minimized or prevented by carrying out the precipitation from a dilute solution of the analyte, at a temperature close to the boiling point of water and with constant stirring.

2019年6月3日 · As out-of-equilibrium materials, the structure and properties of colloidal gels are largely controlled by the history of their precipitation. However, the role played by the gel microstructure in controlling the kinetics of its precipitation remains unclear.

2022年12月20日 · Precipitation of colloid. The presence of charge on colloidal particles accounts for the lyophobic sols’ stability. If the charge is removed in some way, the particles will come closer together to form aggregates (or coagulate) and settle down. The process of settling colloidal particles is known as coagulation or sol precipitation.

2002年10月1日 · In precipitation processes a chemical reaction produces a sparingly soluble product which starts to precipitate as a solid via nucleation and growth. As a rule, the newly precipitated primary particles are in the nanometer size range. The behaviour of colloidal particles in this size range is governed by interfacial forces.