Use app×
Join Bloom Tuition
One on One Online Tuition
JEE MAIN 2025 Foundation Course
NEET 2025 Foundation Course
CLASS 12 FOUNDATION COURSE
CLASS 10 FOUNDATION COURSE
CLASS 9 FOUNDATION COURSE
CLASS 8 FOUNDATION COURSE
0 votes
3.6k views
in Chemistry by (33.5k points)
closed by

What do you mean by sol and gel? Describe the sol-gel method of preparation for nanoparticles.

1 Answer

+1 vote
by (34.1k points)
selected by
 
Best answer

(1) Sol : Sols are dispersions of colloidal particles in a liquid. Colloids are solid particles with diameter of 1-100 nm.

(2) Gel : A gel is interconnected rigid network with pores of submicrometer dimensions and polymeric chains whose average length is greater than a micrometer.

(3) Sol-gel Process : A sol-gel process is an inorganic polymerisation reaction. It is generally carried out at room temperature, it includes four steps : Hydrolysis, polycondensation, drying and thermal decomposition. This method is widely used to prepare oxide materials.

The reactions involved in the sol-gel process are as follows :

MOR + H2O → MOH + ROH (hydrolysis) metal alkoxide

MOH + ROM → M-O-M + ROH (condensation)

  • Formation of different stable solution of the alkoxide or solvated metal precursor.
  • Gelation involves the formation of an oxide or alcohol-bridged network (gel) by a polycondensation reaction.
  • Aging of the gel means during that period gel transforms into a solid mass.
  • Drying of the gel involves removal of water and other volatile liquids from the gel network.
  • Dehydration is achieved when the material is heated at temperatures up to 800°C.

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...