Interaction between particles
A suspension is a heterogeneous mixture of solid particle in carrier liquid. It is not dissolved it is suspended. The emulsion is the mixture of two or more immiscible liquids. E.g. Water and oil, soap and water. A colloidal solution is the mixture of sub micronic particles in carrier liquid.The particles are kept in suspension through brownian motion.
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The particles in suspensions are larger than those found in solutions. Components of a suspension can be evenly distributed by a mechanical means, like by shaking the contents, but the components will settle out.
Colloid chemistry at the coffee shop
Tired after your walk, you head for a coffee and doughnut. This introduces us to colloids, tiny particles of one substance (gas, liquid or solid – the disperse phase) suspended (or floating) in another (the continuous phase – gas, liquid or solid). All combinations are possible, except gas in gas, eight in all. Colloids account for a surprisingly high proportion of the substances we come across in everyday life, as a visit to a coffee shop demonstrates.
Emulsion vs. Dispersion – What is the Difference?
In addition to providing sanitary pumps, valves and custom products to the high purity industries, Holland have also offers offer a line of dispersion equipment. Under various brand names, the technologies Holland offers include sanitary shear pumps, colloid mills, mixers, and high pressure homogenizers. These technologies, as the name would imply, are used for processing of emulsions and dispersions. While these terms are often used interchangeably, this post will focus on what emulsions and dispersion are and how they are different.
A hydrophilic colloid, or hydrocolloid, is defined as a colloid system in which the colloid particles are hydrophilic polymers dispersed in water. Hydrocolloids can be either reversible or irreversible (single-state). For example, agar is a reversible hydrocolloid of seaweed extract; it can exist in a gel or liquid state and can alternate between states with either heating or cooling.
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CH: Chitosan; SA: Sodium alginate; 5-FU: 5-Fluorouracil; PLGA: Poly (lactide-co-glycolide); IOP: Intraocular pressure; AUC: Area under the curve; BT: Brimonidine tartrate; DS: Diclofenac sodium.
Stabilization serves to protect colloids from aggregation and-or phase separation. The two main mechanisms for colloid stabilization involve steric and electrostatic modifications. Electrostatic stabilization is based on the mutual repulsion of like electrical charges. By altering the surface chemistry to induce a charge on the surface of particles it is possible to enhance the stability of the colloidal dispersion.
Electrostatics at the oil–water interface, stability, and order in emulsions and colloids
Confocal micrographs of PMMA spheres (radius 1.08 μm) suspended in CHB-decalin, in contact with water. (A) Part of a (110) plane of the body-centered-cubic colloidal crystal in the bulk oil phase. (B) Particle monolayer, followed by a large zone depleted of particles near the water-suspension interface. (C) With 1.6 μM NaOH in the water phase the depleted zone in the oil phase shrinks considerably.