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Transmission electron micrographs showing sublimation of a NP

Direct Measurements of Fundamental Sintering Parameters in Nanoparticles Desiderio Kovar , University of Texas at Austin, DMR 1006894. Transmission electron micrographs showing sublimation of a NP.

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Transmission electron micrographs showing sublimation of a NP

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  1. Direct Measurements of Fundamental Sintering Parameters in NanoparticlesDesiderioKovar, University of Texas at Austin, DMR 1006894 Transmission electron micrographs showing sublimation of a NP To make accurate measurements of sintering, it is important to precisely measure the temperature. We are using the sublimation of silver nanoparticles (NPs) as a very sensitive temperature calibration of the in situ heater. This is done by measuring the change of particle radius with time at a given temperature and comparing to the Kelvin equation. To measure sintering rates, we have utilized the LAMA process to deposit bare Ag NPs and produce lines. We have found that sintering of NPs occurs at temperatures several hundred degrees lower than for conventional micron-scale Ag particles. This process could enable patterned conducting lines to be deposited onto lower cost polymer substrates rather than glass or ceramic substrates that are currently used. Scanning electron micrographs showing sintering of NPs

  2. Direct Measurements of Fundamental Sintering Parameters in NanoparticlesDesiderioKovar, University of Texas at Austin, DMR 1006894 We have participated in a summer program where two high school students from the Texas School for the Deaf worked in our laboratory for several weeks during the summer. This program offers the opportunity for highly under-represented students to experience research at a hands-on level. The goal is to provide experience and motivation for these students to pursue careers in STEM areas. TSD and UT Austin students/staff at Austin Children’s Museum • Graduate students supported by this project have presented the results of our research at regional, national and international conferences including: • 1.“Sintering of Silver Nanoparticles using In-situ Transmission Electron Microscopy (TEM) Heating,” with M.A. Asoro*, and P.J. Ferreira, IMC 2010 - 17th International Microscopy Congress, September 19-24, 2010, Rio de Janeiro, Brazil. • “Sintering of Silver Nanoparticles using In-situ TEM Heating,” M.A. Asoro*, D. Kovar, P.J. Ferreira, Materials Research Society, Boston, MA, November 29 – December 3, 2010. • “In-situ TEM Observation of Solid to Vapor Phase Transitions in Silver Nanoparticles,” M.A. Asoro*, D. Kovar, P.J. Ferreira, The 2010 Meeting of The Texas Society for Microscopy, Mansfield, TX, April 15-17, 2011. • “In-situ TEM Study of Sintering of Capped Silver Nanoparticles,” M.A. Asoro*, D. Kovar, P.J. Ferreira, 2011 Microscopy and Microanalysis Meeting, Nashville, Tennessee, August 7-11, 2011. • “Pressureless Sintering of Nanoparticulate, Patterned Lines,” with M. Nahar*, M.F. Becker, and J.W. Keto, Pan-American Advanced Studies Institute (PASI 2011) in Scalable, Functional Nanomaterials, August 4-12, 2011, San Jose, Costa Rica.

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