What are the major factors of colloidal dispersion, Biology

Assignment Help:

What are the major factors of colloidal dispersion

The adsorption of ions by colloidal particles is a major factor in stabilizing a colloidal dispersion, since the colloidal particles in a given system have the same charge they repel each other and hence the tendency to coalesce is reduced. Addition of salts to a sol causes precipitation. Charged particles have strong attraction for the polar water molecules and therefore are hydrated, probably having a complete envelop of water molecules. 

Addition of salt helps in the withdrawal  of water from the hydrated surfaces of the particles and this helps precipitation. Sols, unlike solutions, have low osmotic pressure.  Thus, they cannot pass through animal membranes or through cellulose walls in plants.  In lyophobic sols, there is little interaction between the dispersed phase and the dispersion medium. Consequently, properties  like viscosity and surface tension of such sols are the same as these of the dispersion medium at the same temperature. In the lyophilic sols, owing to the salvation of the dispersed phase, there is difference in properties. The viscosity of lyophilic sols is greater than that of  the dispersion medium and is increased marked by a decrease in  temperature or an increase in particle concentration. At particle concentration greater than 20 percent, sols may exhibit elasticity.

 


Related Discussions:- What are the major factors of colloidal dispersion

Zoo flagellates, #question names of 10 zoo flagellates

#question names of 10 zoo flagellates

Type of membrane is the cell membrane, Q. Concerning permeability what type...

Q. Concerning permeability what type of membrane is the cell membrane? The cell membrane is a selectively permeable membrane that is it allows the passage of water and some sel

Define pipette - nutritional biochemistry, Define Pipette - Nutritional Bio...

Define Pipette - Nutritional Biochemistry? Pipettes are used to deliver a known volume of liquid from one container to another. They are precision instruments of measurement an

What are the benefits of plant-incorporated protectants, What are the benef...

What are the benefits of plant-incorporated protectants? Plant-incorporated protectants can be a promising pest management alternative where traditional pesticides may not be a

What should we focus on during pregnancy, What should we focus on During pr...

What should we focus on During pregnancy? Our focus should be strongly on the preventive aspects of nutrition, identify women at-risk, recognize special needs for counseling, a

Homo sapiens fossilis (cro-magnon man), Hom o sapiens fossilis (CRO-M...

Hom o sapiens fossilis (CRO-MAGNO N MAN) - Fossils found from Cro-Magnon, France by Mac Gregor (1868) Replaced Neanderthal man about 35.000 years ago Sharp nose

Explain recovery or anabolic phase of stress response, Explain Recovery or ...

Explain Recovery or Anabolic Phase of Stress Response? When wounds are closed and infection has resolved, repletion of lean tissue and fat stores along with restoration of stre

Patterns & Mechanisms of Evolution, What types of individuals in a populati...

What types of individuals in a population are represented by the two ends of a bell curve?

Cell interactions and ooplasmic determinants, Cell Interactions and Ooplasm...

Cell Interactions and Ooplasmic Determinants Microscopic observations of egg cytoplasm suggests that it is not homogenous in appearance. The observable variations in the cytop

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