Colloids Definition and 18 Threads

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 at the image below which shows potential energy curve, we can see two local minima and one...

If it occurs spontaneously then it must increase entropy but the possible micro states reduce so what else is occurring to increase entropy

Hi, I was studying soft matter physics when a question arose between a friend and me. Namely if red blood cells can be considered to be a colloid. Colloids as it was presented to us had 3 criteria: high diffusion so the particles wouldn't form a sediment, a small reynolds number and a surface...

What are the methods for quantifying the amount of colloidal particles in sol mixtures?

I understand that colloids (at least those less than 0.7 um in diameter) are not filterable using conventional filters. But are there other physical separation methods that can separate them from solution, apart from using membranes? Centrifugation perhaps? I just want some confirmation. Thank you!

Hello, I read about the colloidal solutions in my chemistry book, and came across this sentence: "Emulsoids (a type of colloidal solutions) are difficult to be precipitated, e.g. by concentrated solution of NaCl (removes H2O film by its osmotic power then it neutralize the charges)." I don't...

Hello everyone This is sort of a geometry problem. I'm sure it has an easy answer but it just won't come to me. Here's my problem A close packed colloidal aggregate of smaller spherical colloidal particles can be thought of as small spheres within a sphere. I have the relationship...

Hello in class we recently were asked to find a test that distinguishes between a colloidal gel and a true solution. The gel we made in lab was sterno. I thought coagulation or Tyndall effect but not confident in either. Any help is appreciated greatly.

Hello guys, I'm bit confused here, hope you guys can help me out. 1. Crystalloid- Ok they contain water soluble molecules. So eg is Saline (NaCl). Now book says if I infuse crystalloids then only 1/3 of of my infusion would remain in the intravascular compartment. Now my question is why...

Hello everybody :smile: I'm not sure if this topic exists but I'm really confused about this thing :shy: I have to write some work about electrostatic stabilisation in nanomaterials and I read a lot but couldn't find anything directly related to nanoparticles. I found only electrostatic...

A dispersion of spherical polymer particles contains Np = 4•1013 particles/dm3. The total surface of the particles in 1 dm3 is Asp = 820 m2. a) What kind of average diameter can we calculate. Calculate this average diameter. b) If we know that the dispersion contains 60 vol% water, we...

How does one evaluate the drag force on a particle moving through a colloid? And how does this depend on the size of the particle compared to the constituents making up the collloid? For particles much larger than the constituents I can imagine one can just do the same as for a normal fluid...

I've been reading a little about this rather new subject (to me), and I'm quite confused. I understand that a colliod is broadly dfined as a substance consisting of a dispersive phase, ie very finely ground gold dust, in a continuous phase, ie water. I'm informed that colliods are...

Can anyone point me towards some background reading on how to go about using voltammetry to determine energy levels in semiconductor nanoparticles that are held in colloidal suspension by an alkyl (probably undecyl) monolayer - will this hydrophobic envelope pose problems in terms of getting...

are they solid/ liquid? bulk modulus or shear modulus to be used?

I have a question on finding elasticity of colloids. I am using Ultrasonics testing on testing the different elasticity of gelatine with different concentrations of additives, ie, salt, sugar. From the ultrasonics data, I calculated the attenuation coefficient and the velocity (speed of...

I have a question on finding elasticity of colloids. I am using Ultrasonics testing on testing the different elasticity of gelatine with different concentrations of additives, ie, salt, sugar. From the ultrasonics data, I calculated the attenuation coefficient and the velocity (speed of...

I have a question on finding elasticity of colloids. I am using Ultrasonics testing on testing the different elasticity of gelatine with different concentrations of additives, ie, salt, sugar. From the ultrasonics data, I calculated the attenuation coefficient and the velocity (speed of...