The electrocaloric effect!

(currently listening to: Fleet Foxes)

Hey internet.

I have emerged out of my cave!

Armed with only a powerpoint presentation (a hefty powerpoint, mind you-- with fancy animations[1]), I jumped through the first non-course-related hoop required for my degree: my 502!

I chose a topic that was both pretty nifty in my opinion and really out of my normal field of study.[2] Known as... the electrocaloric effect!

The electrocaloric effect is a solid-state cooling process that uses ferroelectrity. It is really spiffy for cooling things like portable electronics (because not everyone enjoys frying eggs on their laptop), since it scales down really nicely to applications where conventional refrigeration can't.

The electrocaloric effect is pretty similar to the process that occurs in magnetic refrigeration, which was the first method for getting really, really low temperatures (like, 0.3 K cold. Brrr.). Electricity is cheaper and easier to control than magnetic fields, and so the electrocaloric effect could be really applicable to consumer goods.

Another advantage that the electrocaloric effect has is that the materials involved that show significant cooling are widely industrially available and dirt cheap. I would not be surprised if there was a commercial application of this technique in the next 5-10 years, which is kind of nifty in comparison with a lot of outer-space seminars.

So, anyway. It's cool! Har-har, pun intended. The most recent report in the field came from Penn. State University in July, and got lots of attention, including a highlight in Scientific American.

Looking back on the whole process of learning, preparing a presentation and practicing it, I would have to say it was hella stressful, but worth all of the hard work. The hardest part was realizing just how much background information I had to go over. Annnd, the nomenclature was super confusing; I will never look again at the variables P and E without thinking about Polarization and Electrical Field for a second (instead of the chemically-normal Pressure and Energy).

Here's some references if you're interested in reading more about this:
1. Neese et. al, "Large Electrocaloric Effect in Ferroelectric Polymers Near Room Temperature," Science, 2008.
2. Mischenko et. al, "Giant Electrocaloric Effect in Thin-Film PbZr0.95Ti0.05O3," Science, 2006.
3. Mischenko et. al, "Giant electrocaloric effect in the thin film relaxor ferroelectric 0.9 PbMg1/3Nb2/3O3–0.1 PbTiO3 near room temperature," Applied Physics Letters, 2006.

Holla!

[1] I actually used Keynote instead of Powerpoint, which made my slides all magic and pretty. To be honest, I found Keynote to be decidedly un-Apple-like in its unintuitive interface, but it did have fancy transitions and animations. And really, isn't that what really these things are all about?

502 seminars

Hey there Internet:

Mark your calendars: on November the 12th, 2008, I will stand in front of a jury of my peers (or worse, my professors) for my 502 seminar.

The seminar is a requirement for our department's PhD program (I think it's a quite common part of other schools, too); it's a 45 minute presentation on an area of research outside of your own, followed by 15 minutes of grilling from anyone who is interested enough to attend.

I am really excited to start preparing for it (and, um, just a titch nervous), but there's only one problem: I haven't picked my topic yet! I have to do some digging to see what sort of literature is out there that tickles my fancy, but here are some topics that I am curious about:

• New thermoelectric materials
• Green(ish) nanomaterials
• Self-healing materials

Anyone have any cool suggestions? Topics involving quantum dots probably won't fly as they're a little too close to home.

Talk to you later,
Joel Smelly Kelly