What I did is the same idea but instead of blades stacked with thier edges facing you picture needles on a nano scale. Blades are effective on one axis. Needles on two axes.
J Kirk McLoren wrote: > Laser targets look like a stack of razor blades. Multiple reflections > and absorbance at each juncture. I once penciled a z fold with 20 degree > aperture and made of polished copper would look as good as a black > selective surface receiver. The polished copper has low emittance but > even though absorbance was around 60% It was quite high after multiple > reflections. As your aperture closes # of hits (or bounces if you > prefer) become higher and higher. > Kirk > > */Mike Redler <[EMAIL PROTECTED]>/* wrote: > > Hi Joe, > > Your research is a little outside of my range of expertise. So, I gave > your message to my finance. She has a PhD in Chemistry and runs a > chromatography lab. > > All she had to say was "Wow! He's got access to some nice > equipment.". I > think she's jealous. > > I may be way off but, your description reminds me of black anodize. > > Anyway, it looks promising. > > Good luck. > > -Redler > > > Joe Street wrote: > > Hi Mike; > > > > I don't have any references I can recommend but I'll tell you what I > > did. I dry etched silicon using flourine ions in a reactive ion > etcher. > > Making use of native polymer contamination of the surface and > carefully > > controling the presence of oxygen radicals I was able to form a > dense > > structure of columns roughly 100 nm wide and 400 nm tall that when > > viewed with an electron microscope look something like a forest. The > > nanoconvolution of the surface on a scale less than the > wavelength of > > visible light results in an extremely antireflective black surface > > similar to a moth's eye. (BTW this is why moths see so well in > the dark) > > The silicon material absorbs all the incoming radiation in the > visible > > and longer wavelengths and even most of the ultaviolet I'd guess > as low > > as 198 nm although I haven't tested it. Silicon is roughly > similar to > > iron in its heat conducting properties so this film would be very > good > > for a passive solar system. I think I could build a machine to > sputter > > silicon on pipes and etch it in situ if I had the resources. > > > > Joe > > > > Mike Redler wrote: > > > > > >> Hi everyone, > >> > >> I know of some descent resources for electronic circuits, software > >> development, and a bunch of other stuff. However, I've come up with > >> nuthin' for black bodies which contains both a practical guide for > >> passive solar collection and the analytical/mathematical tools for > >> theoretical modeling. Once I have that, I'm good to go, already > having > >> one pretty good general text on heat transfer (J.P. Holman, > seventh ed.). > >> > >> Joe, I know you mentioned some work you did with thin films (if my > >> memory serves me right). > >> > >> Can anyone point to a good on-line source? I'd even be happy with a > >> textbook recommendation. > >> > >> -Redler > > _______________________________________________ > Biofuel mailing list > Biofuel@sustainablelists.org > http://sustainablelists.org/mailman/listinfo/biofuel_sustainablelists.org > > Biofuel at Journey to Forever: > http://journeytoforever.org/biofuel.html > > Search the combined Biofuel and Biofuels-biz list archives (50,000 > messages): > http://www.mail-archive.com/biofuel@sustainablelists.org/ > > > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! Mail has the best spam protection around > http://mail.yahoo.com > > > ------------------------------------------------------------------------ > > _______________________________________________ > Biofuel mailing list > Biofuel@sustainablelists.org > http://sustainablelists.org/mailman/listinfo/biofuel_sustainablelists.org > > Biofuel at Journey to Forever: > http://journeytoforever.org/biofuel.html > > Search the combined Biofuel and Biofuels-biz list archives (50,000 messages): > http://www.mail-archive.com/biofuel@sustainablelists.org/ > _______________________________________________ Biofuel mailing list Biofuel@sustainablelists.org http://sustainablelists.org/mailman/listinfo/biofuel_sustainablelists.org Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html Search the combined Biofuel and Biofuels-biz list archives (50,000 messages): http://www.mail-archive.com/biofuel@sustainablelists.org/
