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Join Date: Dec 2007
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LIQUID-GEL-LIQUID PROBLEM

09/16/2008 6:27 PM

I am seeking the answer to a liquid-gel that can solidify at 37 deg C and return to liquid at sub 35 deg,the liquid gel would be contained in a thin silicon capsule. The use of this capsule is to be inserted into the auditory canal of the ear so as to act as a universal hearing aid.A thin tube would be inserted through the centre of the capsule.The volume of a liquid gel would be proportional as to its use, and to the perplexity of this problem.As a solid gel it is hoped that the silicone capsule would expand to the contour of the auditory canal.When removed the gel is to react at a lower temperature turning to liquid.As i have a limited time to resolve this problem and many liquid gels react in a reversal of temperatures.I hope i have been clear and concise,and welcome all possibilities.

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#1

Re: LIQUID-GEL-LIQUID PROBLEM

09/16/2008 9:37 PM

dear fab 4440, perhaps you could use a polymer that when exposed to the salt present in the ear would cut and thus liquify, like many of todays shampoos work. (believe it or not it is salt from our perspiration that cuts the polymers in the shampoos that then help them "suds up.") Check out the labels of some shampoos and then find a consulting chemist.

Just a thought.

In keeping with my long standing "protect the customer" principle, you are aware of the FDA requirements and testing and approval protocalls for materials contacting humans tissues???

milo

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#2

Re: LIQUID-GEL-LIQUID PROBLEM

09/17/2008 11:27 PM

I can understand what you are trying to accomplish but, I can't think of a single liquid that would gel on temperature rise and re-liquefy on temperature drop that is also suitable for your intent. The only thing that crossed my mind would be to mould a standard "plug" from closed cell silicone foam having a density soft enough to be comfortable to the wearer.

BTW, are you meaning "universal" as 'one size fits all' or as in multiple users of a single device?

Good luck with your project.

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Active Contributor

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#3
In reply to #2

Re: LIQUID-GEL-LIQUID PROBLEM

09/18/2008 3:25 PM

FKIA

Thanks for your advice i have stipulated "universal" for the reason of fit to size.This effectively cuts out the middle man who performs the task of taking a mould and then creating the silicon ear piece.

FAB4440

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#4

Re: LIQUID-GEL-LIQUID PROBLEM

10/09/2008 12:43 PM

Fab4440

I think I can come close. I sorry I don't know the name of the material, but I think it just might push you in the right direction to solve your problem.

There is a hand warmer on the market, (look into outdoor stores that sell to hikers, campers, fishermen and hunters). The hand warmer is a liquid in a plastic sack with a metal disk in the liquid. When you bend the disk in the liquid it 'snaps' and then the liquid starts to give off a lot of heat and turns solid. While it's giving off heat, you can sort of shape the plastic sack to fit your hand or pocket.

To get the hand warmer back to liquid, you boil it until you don't see any crystals in the liquid, then you can remove it from the boiling water and allow to cool. You can reuse this hand warmer over and over again.

I was thinking if that liquid in the bag is diluted, then maybe your idea would work if the mix was slightly different.

I suggest you find out what they are using for this hand warmer as you may be able to alter the chemistry just a bit to get what you need.

Or, it may not work at all. Just a suggestion.

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#5
In reply to #4

Re: LIQUID-GEL-LIQUID PROBLEM

10/19/2008 7:06 AM

I think the hand warmer uses a supersaturated solution of Sodium Acetate, hence once dissolved, any disturbance causes crystallization.

I'm only going on memory for this so I may be wrong.

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fab4440 (1); FKIA (1); Labyguy (1); Milo (1); sceptic (1)

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