Date of publication: 2017-08-23 21:14
A new home and office alarm system detects disturbances in WiFi to warn residents of potential burglars. The Aura , as it’s known, picks up “ disruptions in the invisible radio waves that make up your home’s Wi-Fi network ” to determine if someone—or perhaps some thing —is sneaking around inside, uninvited.
I 8767 d be happy to review any designs you might be thinking about in advance post them to the web some place and then post another comment here you can embed the URL to your images by clicking the 8775 You can add images to your comment by clicking here 8776 link below the comment box.
submersed in any liquid, Aerogels will change their dimension. If you 8767 re talking about silica aerogels, they might not last long in water as their backbone will break (AFAIR).
In an open porous network like aerogels you should clarify, what you mean by 8775 bulk 8776 in bulk density. Using a 8775 theoretical 8776 liquid that does not affect the network of the backbone material (ie. zero surface tension) and with a visosity that allows to fill the entire network, you should end up with the density of the backbone material (. Silica).
We are thrilled to announce that The Ronald O. Perelman Performing Arts Center at the World trade Center has been honored with a 7567 P/A Award.
Hello I 8767 m a Cornell student part of a senior research group on aerogels and we need to make basic bulk density measurements. We plan on doing this via Archimedes method and have seen literature examples which use Kerosene as the liquid. What are the advantages to this over water?
I’m biased, but my wife, Nicola Twilley, had a great feature in The New Yorker ’s “Innovation” issue earlier this month, about an emerging type of device known as “sensory-substitution technology.”
I want to second the Kalyan 8767 s question. I 8767 m planning to supercritically dry 8 pieces of silica gel which are in size of about 9mm x 5mm x 5mm. What kind of container sohould I put them into before putting everything into the chamber of my manuclave?
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Not a silly question and actually a good idea! The question is whether or not you can get a gel to setup without the solvent drying. Might happen on its own, might need a crosslinker. Give it a shot! If you can get a gel, you 8767 ll probably be able to purify it and do supercritical drying.
I am so glad you are back! I think the difference is the TEOS/ethanol/water ratio. I tried from 6:9:7 to 6:9: 67 and used a small amount of acetate acid to hydrolyze the sol and after 6h I added a little ammonia, the sol can change to gel immediately. So I think the reason I couldn‚Äôt get the aerogel is that the water content is too low and I shouldn‚Äôt put these three solutions together. Hope it will help others.
Firstly, thank you for your responses to my questions
I have another question!
If an aerogel sample (for example RF aerogel) be immersed in water or other solvents (eg. acetone, ), will it shrink due to capillary forces after evaporate drying?
or would aerogel structure be collapsed in moist air (during a long time) because of Moisture absorption?
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I‚Äôve been in the process of fabricating silica aerogels for the past few months now, and have been somewhat successful. I wish I found your site earlier it would have saved me several weeks of trial and error!
This Spring we will be posting a podcast with Prof. Jeff Brinker who developed this technique. He will talk in more detail about subcritical drying of aerogels, which is the same method Cabot Corp. uses to make Nanogel.