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3. Bubble Nucleation on Nano- to Micro-size Cavities and Posts: An Experimental Validation of Classical Theory

Author

Witharana, S., Phillips, B., Strobel, S., Kim, H. D., McKrell, T., Chang, J. -B., Buongiorno, J., Berggren, K. K., Chen, L., and Ding, Y.

Subjects
Physics - Fluid Dynamics
Abstract

Recently-reported data suggest that bubble nucleation on surfaces with nano-sized features (cavities and posts) may occur close to the thermodynamic saturation temperature. However, according to the traditional theory of heterogeneous bubble nucleation, such low nucleation temperatures are possible only for surfaces with micro-scale cavities. Motivated by this apparent contradiction, we have used infrared thermometry to measure the nucleation temperature of water on custom-fabricated nano- to micro-scale cavities (from 90 nm to 4.5 um in diameter) and posts (from 60 nm to 5 um in diameter), machined on ultra-smooth and clean silicon wafers using electron beam lithography. Our cavity data are in agreement with the predictions of the Young-Laplace equation, thus re-affirming the correctness of the classic view of heterogeneous bubble nucleation, at least for the water-silicon system investigated here. The data also suggest that individual posts of any size have an insignificant effect on bubble nucleation, as expected from theory. Keywords: Bubble nucleation, superheat, artificial cavities and posts, nanosize, Young-Laplace, Comment: 13 pages, 5 figures. Accepted by Journal of Applied Physics

Published
2012
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4. Science education. Changing the culture of science education at research universities.

Author

Anderson, W A, Banerjee, U, Drennan, C L, Elgin, S C R, Epstein, I R, Handelsman, J, Hatfull, G F, Losick, R, O'Dowd, D K, Olivera, B M, Strobel, S A, Walker, G C, and Warner, I M

Subjects
Academies and Institutes, Faculty, Interdisciplinary Communication, Research, Research Support as Topic, Science: education, Teaching, Universities, cultural change, educational development, student, theoretical study, article, college student, education, education program, learning, medical research, priority journal, science, scientific literature, scientist, teaching, university, education, financial management, interdisciplinary communication, organization, research, teaching, university, Academies and Institutes, Faculty, Interdisciplinary Communication, Research, Research Support as Topic, Science, Teaching, Universities
Published
2011

31. Fabrication of regularly arranged nanocolumns on diamond (100) using micellar masks

Author

Koslowski, B., Heinz, B., Boyen, H. G., Notz, R., Moller, M., Strobel, S., Herzog, Th., Ziemann, P., and Spatz, J. P.

Subjects
Gold -- Chemical properties, Diamond crystals -- Structure, Diamonds -- Structure, Physics
Abstract

Cylindrical diamond columns of 15 nm height and 10 nm diameter are prepared on a diamond (100) substrate by exploiting the self-organization of metal-loaded diblock copolymers. The study shows that after burning off the blockcopolymer in an oxygen-plasma the resulting Au nanoparticles act as a mask during further etching the diamond substrate in this plasma and Au-capped diamond columns are formed with an approximate size of the former gold particles.

Published
2000

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