Can you explain gels, Chemistry

Assignment Help:

Q. Can you explain Gels ?

Gels may be formed by the proteins of egg or flour in products like souffles, puddings, custards, batters and doughs. When the protein particles are dispersed in water, the solution like mixture results in the formation of a sol. When a sol assumes a rigid form, it is referred to as a gel.

The change of sol to gel form may be brought about by a change of concentration of the dispersed phase, a change in temperature, or a change in the hydrogen-ion concentration or electrolyte content.

Gel formation takes place when the dispersed phase develops into a network structure that holds the liquid phase in its meshes. In some gels, the framework can be broken by agitation or heat. When this happens, the gel structure reverts back to the sol form. However gels formed as in case of baked custards are of non-reversible types.

When only a part of sol changes to the gel form, the process is known as flocculation. An example of this process can be seen in heated milk when a precipitate coats the bottom of the pan.

Syneresis is the process when the gel on shrinkage results in the loss of liquid. This process was first observed in 1861 by T. Graham, who described the process as an exudation of small amounts of liquid on standing because of a slight contraction of the gel. Although no net volume change occurs in the gel, syneresis cannot be described as a reversible process.


Related Discussions:- Can you explain gels

Zakir, how to calculate the Fluoride ion concentration by ion meter?

how to calculate the Fluoride ion concentration by ion meter?

Oxidation & reduction, theory of oxidation & reduction titration with examp...

theory of oxidation & reduction titration with examples

, calculate the ratio of the fundamental frequency of HI and D

calculate the ratio of the fundamental frequency of HI and DI

Formula of a metallic oxide is mo, Formula of a metallic oxide is MO.The  f...

Formula of a metallic oxide is MO.The  formula of its phosphate will be: (1) M 2 (PO 4 ) 2                      (2) M (PO 4 )         (3) M 2 (PO 4 )       (4) M 3 (P

Composition of individual phase in phase diagram – two phase, Explain Compo...

Explain Composition of individual phase in phase diagram – two phase? If the system point is in a two-phase area of the phase diagram, we draw a horizontal tie line of constant

Quantitative chemistry, A student wishes to prepare 250ml of a 0.20mol/L so...

A student wishes to prepare 250ml of a 0.20mol/L solution of oxalic acid (COOH)2.2H2O. a) Calculate the amount (no.of moles) of oxalic acid required. b) Calculate the mass of oxali

Limitations of hybrid orbitals, Q. Limitations of Hybrid orbitals? ...

Q. Limitations of Hybrid orbitals? It gives no idea whether a particular metal ion would prefer to have any particular geometry say, an octahedral or tetrahedral with a giv

Determine uncertainty in momentum of an electron, The uncertainty in moment...

The uncertainty in momentum of an electron is 1 x 10 -5 kgm/ s  . The uncertainity in its position will be( h= 6.63 x 10 -34 Js) : (1)  5.28 x 10 -30 m

Stability of gem diols lies, Stability of gem diols lies on the following f...

Stability of gem diols lies on the following factors: (a) Steric hindrance by +I group around α-carbon decreases the stability of gem diols. +I group decreases stability of gem

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd