Looking for Phase change material

[martinl]

Hi All,

I'm working on a project that requires a flexible membrane be heated and cooled about 2000 times.

During the cooling process, I require the material give off heat for as long a period of time as possible. I figure a phase change material will have the highest heat capacity and give off its latent heat, over an extended period of time, while cooling at it's melting point.

So, I'm looking for a phase change material that I can imbed in a thin layer of silicon rubber to form the heat sink part of my membrane.

I considered magnesium nitrate hexahydrate (melting point 87 C), but fear that it is too toxic and flammable. The final membrane will be handled extensively and twisted and bent many times over its lifetime.

Could someone please give me some more suggestions of what else to try?
As many as possible (I may want to mix them to even out the heat transfer over the temp range)

Thanks a lot.

 

[chemisttree]

Try the various esters of palmitic acid. Find some that are liquid at slightly higher than room temperature. Some other compounds you might consider are, in a general class, saturated fatty acid methyl or ethyl esters, cholesteryl esters, rigid rod aromatic esters.

 

[ravenprp]

Hello there,

Thank you for reaching out to the community for suggestions on phase change materials. It sounds like you are working on a very interesting project, and I would be happy to offer some suggestions.

One potential phase change material you could consider is paraffin wax. It has a high heat capacity and can release its latent heat over a longer period of time during the cooling process. It also has a relatively low melting point (around 60-70 degrees Celsius) which may make it suitable for your project.

Another option could be a mixture of water and salt, such as sodium acetate. This combination can have a higher heat capacity than paraffin wax and can also release its latent heat over a longer period of time. It also has a lower melting point (around 50 degrees Celsius), making it a potentially safer and more versatile option for your project.

You may also want to consider using a combination of different materials to achieve your desired heat transfer over the temperature range. For example, you could use a mixture of paraffin wax and water/salt to create a customized phase change material that meets your specific needs.

I hope these suggestions are helpful to you and I wish you the best of luck with your project. Let us know if you have any further questions or need additional assistance. Happy experimenting!