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Are there any material that contact with water and expand?

by kevin_tee
Tags: contact, expand, material, water
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kevin_tee
#1
Jan28-14, 02:50 AM
P: 57
Are there any material that contact with water and expand? I can think of sodium polyacrylate, but I can't use it. Thanks.
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Dadface
#2
Jan28-14, 03:16 AM
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Anything that's been dehydrated comes to mind such as dried peas. Just thought of something else but I dont know what its called. It comes in powder form and when water is added it expands to a soggy jelly. You can add it to the soil in plant pots to maintain the moisture level.Try your local plant nursery. I guess there are loads of other things.
kevin_tee
#3
Jan28-14, 05:17 AM
P: 57
Quote Quote by Dadface View Post
Anything that's been dehydrated comes to mind such as dried peas. Just thought of something else but I dont know what its called. It comes in powder form and when water is added it expands to a soggy jelly. You can add it to the soil in plant pots to maintain the moisture level.Try your local plant nursery. I guess there are loads of other things.
I think the soggy jelly that you mention is SAP(Super absorbent polymer) which is sodium polyacrylate that I mention, but I can't use it. Basically I need a material that significantly increase in volume when hydrate or being stimulate. Thanks.

Dadface
#4
Jan28-14, 05:28 AM
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Are there any material that contact with water and expand?

I'm guessing there are safety issues with SAP. How about dehydrated foodstuffs? If powdered these can probably rehydrate in a short time.
Borek
#5
Jan28-14, 05:41 AM
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Starch.
epenguin
#6
Jan28-14, 06:39 AM
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There are these polysaccharide powders used for gel permeation chromatography (separation on a molar mass basis) sold under the name Sephadex, they swell 10 or more times in volume on adding water.
kevin_tee
#7
Jan28-14, 07:00 PM
P: 57
Thanks for every answers.
DrDu
#8
Jan29-14, 01:04 AM
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Gypsum
mesa
#9
Jan29-14, 10:54 AM
P: 553
Polyacrylamide and bentonite clays (sodium bentonite in particular). They are pretty swell :)


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