Comments on: This Message Will Self-Heal in 3, 2, 1… http://www.chemistry-blog.com/2010/02/12/this-message-will-self-anneal-in-3-2-1/ We have technical difficulties, it will take a day or two to get back to normal. Thu, 09 Sep 2010 18:24:06 -0700 hourly 1 http://wordpress.org/?v=3.0.1 By: Alan Wertsching http://www.chemistry-blog.com/2010/02/12/this-message-will-self-anneal-in-3-2-1/comment-page-1/#comment-10192 Alan Wertsching Thu, 25 Feb 2010 16:08:03 +0000 http://www.chemistry-blog.com/?p=3703#comment-10192 A better application would be a pressure sensitive coating. One could potentially apply this to an aircraft model and observe accumulive air pressure points. Also when incorporated into composite materials it could detect stress before failure. A better application would be a pressure sensitive coating. One could potentially apply this to an aircraft model and observe accumulive air pressure points. Also when incorporated into composite materials it could detect stress before failure.

]]> By: Two Chemistry Related Stories « Loose Morels http://www.chemistry-blog.com/2010/02/12/this-message-will-self-anneal-in-3-2-1/comment-page-1/#comment-10086 Two Chemistry Related Stories « Loose Morels Sun, 14 Feb 2010 01:38:12 +0000 http://www.chemistry-blog.com/?p=3703#comment-10086 [...] Mitch posted about an interesting reversibly triboluminescent compound (the pictures are quite impressive) from [...] [...] Mitch posted about an interesting reversibly triboluminescent compound (the pictures are quite impressive) from [...]

]]> By: Cassandra Fraser & Guoqing Zhang http://www.chemistry-blog.com/2010/02/12/this-message-will-self-anneal-in-3-2-1/comment-page-1/#comment-10080 Cassandra Fraser & Guoqing Zhang Fri, 12 Feb 2010 23:47:39 +0000 http://www.chemistry-blog.com/?p=3703#comment-10080 Dear Mitch, Thank you for showcasing our "scratch the surface ink"TM on your blog. We are very honored for our work to be highlighted in this way. We can't help but correct the record however, pertaining to this statement: "....(T)he material doesn’t seem to be completely reversible at room temperature without annealing." In fact the material IS entirely reversible at room temperature without annealing! That is what makes it quite unique compared to previous reports of this phenomenon, as far as we can tell. As we state and you quote: "The yellow emission gradually reverted back to green again at room temperature, with much faster recovery at elevated temperature." It is spontaneously self erasing or self healing at room temperature (minutes), but the process is just faster upon heating (seconds). Then you can write again many times. You say: "The field has, in short order, gotten tantalizingly close to a 100% reversible mechanochromic luminescent material at room temperature." In fact it is already there! It's time to celebrate! So maybe the CIA wonks, not to mention artists, toy makers and rewritable paper enthusiasts should be interested after all! Thanks again. Cassandra Fraser and Guoqing Zhang University of Virginia Chemistry Department Dear Mitch,

Thank you for showcasing our “scratch the surface ink”TM on your blog. We are very honored for our work to be highlighted in this way.

We can’t help but correct the record however, pertaining to this statement: “….(T)he material doesn’t seem to be completely reversible at room temperature without annealing.” In fact the material IS entirely reversible at room temperature without annealing! That is what makes it quite unique compared to previous reports of this phenomenon, as far as we can tell.

As we state and you quote: “The yellow emission gradually reverted back to green again at room temperature, with much faster recovery at elevated temperature.” It is spontaneously self erasing or self healing at room temperature (minutes), but the process is just faster upon heating (seconds). Then you can write again many times.

You say: “The field has, in short order, gotten tantalizingly close to a 100% reversible mechanochromic luminescent material at room temperature.” In fact it is already there! It’s time to celebrate!

So maybe the CIA wonks, not to mention artists, toy makers and rewritable paper enthusiasts should be interested after all!

Thanks again.

Cassandra Fraser and Guoqing Zhang
University of Virginia Chemistry Department

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