Making Silica Xerogell From Bagasse Ash : Part 1
The Process Of Making Silica Xerogell
Silica gel is a form of silica produced by the coagulation of sol sodium silicate (NaSiO2). This gel-like solvent can be dehydrated so that it turns into a non-elastic glass-like solid or granular. This property makes silica gel used as absorbent, drying, and catalyst support. Cobalt salts can be adsorbed by this gel. Silica gel prevents the formation of excessive moisture before it occurs. The sol-gel process has been widely developed primarily for the manufacture of hybrids, the combination of inorganic oxides (especially silica) with alkoxysilane.
This process is based on molecular precursors that can undergo hydrolysis, mostly metal or semi-metal alkoxides. Especially for the manufacture of hybrids, combinations of inorganic oxides (especially silica) with alkoxysilane. This process is based on molecular precursors that can undergo hydrolysis, mostly metal or semi-metal alkoxides.
The sol-gel process can be described as forming an oxide web through progressive polycondensation reactions of a precursor molecule in a liquid medium or is a process for forming the material through a sol, gelation of the sol and ultimately forming a gel.
Step by Step Making Silica Xerogell1
Ash of Bagasse
Provide less then 100 gram of Bagasse
Smooth with 80 mesh sieve
Provide NaOH (Sodium Hydroxide)
Mix both Bagasse and NaOH electric heating until boil away till solvent vicous.
Take it and get it warm, then squeeze to get Sol Sodium Silicate ( Yellow Liquid)
Pour into beaker glass
Dry in open until all water is boil away
After water boiled away.
Now its time to mix it with acid
after 24 hour
Pour in pocelain cup
You have made a Silica Gell, Then Next step we continue how to make silica xerogell. i will continue in part 2.
What is your goal for the final product? Has your lab any experience with other gel drying techniques?
Xerogels are interesting. But by drying in a way that preserves the gel's solid structure (so not just boiling in an oven) you get something even cooler. Aerogels.
Final is silica powder, no, we dont find any technique yet about drying,, is there any idea.
Nice. To make other silica structures from gel, you have to remove the liquid phase while keeping the solid phase in place. When you make a xerogel the material shrinks and sometimes cracks as the liquid phase evaporates and the solid phase collapses. To make the Aerogel pictured, you need to use a supercritical technique to dry the hydrogel.
Cool, what is supercritical technique mean ?
Very high pressure - liquid phase that fills container like a gas. Can escape the gel
Thanks @kyle.anderson,
Silica is great for the skin! Followed :)
Exactly for absorber
also how to useful bagasse