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Nanoscale Films: bounded by two transitions: drying and wetting

CAREER: Nanoscale Surficial Disordered Films: Multilayer Adsorbates in Oxide Ceramics, PI: Jian Luo, Clemson University, DMR-0448879.

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Nanoscale Films: bounded by two transitions: drying and wetting

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  1. CAREER: Nanoscale Surficial Disordered Films: Multilayer Adsorbates in Oxide Ceramics, PI: Jian Luo, Clemson University,DMR-0448879 • Pressure-balance and diffuse-interface models have been developed for surficial films on oxides, predicting the universal existence of three adsorption/wetting regimes with increasing T: • "Dry" = Langmuir submonolayer adsorption, • "Moist" or “prewetting” = stable nanoscale surficial films or multilayer adsorbates, and • "Wet" = perfect wetting liquid films with arbitrary thickness. • This CAREER project focuses on experimental and modeling studies of surficial films on oxide materials; meanwhile, our collaborators at MIT (Chiang, Carter, et al.), LBNL (Cannon) and other institutes have investigated analogous interfacial phenomena for two other configurations: native oxide films on Si and intergranular films in Si3N4. All together, a new and unified model is envisioned. • Additionally, recent hot-stage wetting experiments of Bi2O3 on ZnO {11-20} surfaces showed an interesting “cross-over” in contact angle versus temperature, suggesting a mechanistic change in the adsorption or spreading behaviors. Nanoscale Films: bounded by two transitions: drying and wetting Twetting:   0 h  + Tdrying: h  0 High-Resolution TEM Image

  2. Education and Outreach,PI: Jian Luo, Clemson university,DMR-0448879 • Two Websites have been developed and will be updated during the 5-year project period • Education Website: "A Series of Open Mini-Courses in Materials Science and Engineering" http://people.clemson.edu/~jianluo/education/ • Research Results Dissemination Website: "Digital Archive: Nanoscale Surficial Amorphous Films in Oxide Materials“ http://people.clemson.edu/~jianluo/Research/SF.html • Three (3) high school juniors/seniors and two (2) incoming Clemson freshmen participated in 2-5 weeks’ summer research on this CAREER project. These students were mentored by graduate students Qian and Arcot together with the PI. These activities have been conducted in conjunction with Clemson’s J. E. Sirrine and EUREKA! programs, which offered some logistic support. High school students presented their summer research results Education Website

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