Skip to main content

Questions tagged [colloids]

A colloid is a substance in which microscopically dispersed insoluble particles are suspended throughout another substance.

Filter by
Sorted by
Tagged with
10 votes
0 answers
879 views

What is the chemistry behind black colour of platinum black? [duplicate]

Platinum is a silvery white metal and is highly unreactive then why it's powdered form "platinum black" is platinum metal but is black in colour. why would a metal such as platinum become black as a ...
JM97's user avatar
  • 3,477
5 votes
2 answers
810 views

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 ...
hotmeatballsoup's user avatar
4 votes
1 answer
523 views

Movement of solid particles in colloids

A liquid is made up of tiny vibrating particles of matter, such as atoms, held together by intermolecular forces. Where a solid is the same, but the atoms have much less freedom of movement. Even if ...
Renier's user avatar
  • 151
4 votes
1 answer
2k views

Why don't particles of a colloid settle?

Why don't particles of a colloid settle but those of a suspension do? - Is it because they are really small and so remain in constant motion which overcomes the force of gravity and prevents them ...
Arpita Karkare's user avatar
3 votes
1 answer
286 views

What is the molecular mechanism behind oncotic pressure?

I can't wrap my head around the idea of oncotic pressure and osmolarity, logically. I imagine a blood vessel. It is filled with proteins, like a ton of proteins and solutes. So this means, according ...
Paze's user avatar
  • 703
3 votes
1 answer
1k views

Light scattering in sulfur colloids

Recently I did a reaction in the lab (the reaction itself is not important) whose product was colloidal sulfur. As I watched the sulfur particles form I noticed something strange: At first the sulfur ...
Ignacio's user avatar
  • 966
2 votes
2 answers
788 views

How does adding HCl convert AgCl into a sol?

According to the text I follow, in peptization the ions of the added electrolyte (peptizing agent) get adsorbed by the particles of the precipitate and turn the precipitate into a sol. An example of ...
Arnab Chowdhury's user avatar
2 votes
0 answers
220 views

Estimating maximum size of magnetite particles in this Nile Red ferrofluid video?

In the Nile Red video Making ferrofluid from scratch a suspension of small magnetite ($\ce{Fe^{2+}Fe_2^{3+}O_4^{2−}}$) particles is produced from a combination of ferrous chloride and ferric chloride. ...
uhoh's user avatar
  • 5,898
0 votes
2 answers
543 views

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 (...
user avatar
0 votes
1 answer
130 views

What is the modern hardware/supermarket term for 'laundry bluing'?

I want to make this amazing paper Crystal Tree with my kids. One of the ingredients is laundry bluing. It is described thus: The magic crystals that are left behind are a combination of the Mrs. ...
hawkeye's user avatar
  • 833