Questions tagged [colloids]
A colloid is a substance in which microscopically dispersed insoluble particles are suspended throughout another substance.
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How can gelling agents "dissolve" in the liquid phase as a "colloid" mixture?
Gelling agents according to Wikipedia:
Some thickening agents are gelling agents (gellants), forming a gel, dissolving in the liquid phase as a colloid mixture...
But colloid according to Wikipedia:
...
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Weirdness From Boiling Gold Colloid Dry
I was doing an experiment in my chemistry class and found something odd.
We prepared a colloid of gold with the following procedure.
1: Measure out 20ml of Hydrogen Tetrachloroaurate (iii) in grad ...
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Temperature and zeta potential
What is the temperature effect on zeta potential?
My problem was assigned by my teacher for the final exam preparation: "When the temperature is increased, and given in this temperature range, ...
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Co(NO3)2 forming colloid in H2O, and Methanol
I was just trying to make a stock solution of some Co(NO3)2 . One in H2O, another in Methanol. Both don't completely dissolve. They're almost dissolved and appear near translucent but when shining a ...
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Why is micelle formation endothermic?
Most websites mention that it is endothermic and some mention that it is endothermic at low temp. and exothermic at high temp. Nor do I know the correct answer neither I can guess the reason for any ...
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Watercolor pigment conundrum - can a change in ionic profile induce flocculation?
A client of mine has installed an ion exchange water purifier to de-harden her tap water. After that, however, she noticed that it has negatively affected her watercolor painting. From what she ...
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Charge acquired by sols after their preparation
This table from my textbook (p. 20), shows nature of charge on particles of listed sols, in their original or natural form. What reasons can be attributed to oxides (sols) being positively charged? ...
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How do clay particles form a colloidal mixture?
I have been learning about water coagulation in my chemistry textbook. Apparently, before being treated, water has clay particles, primarily silicates and aluminosilicates, which apparently have a ...
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What kind of solution is formed when alkali metals are dissolved at high concentration in liquid ammonia?
When an alkali metal is dissolved in liquid ammonia, it results in the formation of a deep blue coloured solution. $$\ce{M + (x + y) NH3 -> M+(NH3)_x + e^-(NH3)_y}$$
The ammoniated electrons absorb ...
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Why can't there be a gas-dispersed-in-gas colloid? [closed]
Colloids, a special type of heterogeneous mixtures, typically have two components. One is the dispersed phase (DP), which is the "solute-like" part and another one is the dispersion medium (...
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Name of particles in a suspension
What is the proper name given to the particles in a suspension? Suspensae perhaps? When these particles are brought out of suspension, and precipitate down to the bottom of the mixture, what is that ...
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DLVO Theory of Colloid Stability
DLVO theory gives the curve of potential energy vs distance of two colloid particles. Potential energy curve is derived for colloids being only electrostatically stabilized and not sterically.
Looking ...
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Why do silver halide crystals in suspension, develop a surface charge
This is a question related to analog photography. Photographic films have a suspension of silver halide crystals in them, and these crystals have adsorptive properties which are used in this ...
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Bond-order parameter $g_6(r)$
I would like to know the explicit steps to compute the bond correlation function
$$g_6(r) = \langle\Psi_6^*(0) \cdot \Psi_6(r)\rangle$$
for colloids in my experiment (2D). I have the position of all ...
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Will a liquid-liquid emulsion and the separated emulsion have same volume?
Let's assume that there is no dispersed gas (bubbles). Not sure about dissolved gas; maybe you can tell me if that matters. Ordinary liquids (aqueous solution and biological oil). Surfactants are ...
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