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35 results

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  • Atomic-Scale Phase Transformation of CrCl3 Elucidated by Cryo-STEM

  • Hsin-Yun Chao, Miaofang Chi
  • Journal: Microscopy and Microanalysis / Volume 28 / Issue S1 / August 2022
  • Published online by Cambridge University Press: 22 July 2022, pp. 1730-1731
  • Print publication: August 2022
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  • Microscopy Society of America Awards: 2021 Award Winners

  • Miaofang Chi
  • Journal: Microscopy Today / Volume 29 / Issue 6 / November 2021
  • Published online by Cambridge University Press: 02 December 2021, pp. 10-15
  • Print publication: November 2021
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  • Cryogenic Atomic Resolution and 4D STEM Imaging for Energy and Quantum Materials

  • Miaofang Chi, Andrew R. Lupini
  • Journal: Microscopy and Microanalysis / Volume 27 / Issue S1 / August 2021
  • Published online by Cambridge University Press: 30 July 2021, pp. 384-385
  • Print publication: August 2021
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  • Microscopy Society of America Awards: 2020 Award Winners

  • Bob Price, Miaofang Chi
  • Journal: Microscopy Today / Volume 29 / Issue 3 / May 2021
  • Published online by Cambridge University Press: 21 May 2021, pp. 10-13
  • Print publication: May 2021
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  • Each year, the Microscopy Society of America (MSA) provides several major awards for outstanding contributions to the fields of microscopy and microanalysis and for service to the Society. While recipients of these awards are listed under the tab Awards & Scholarships – Society Awards | Microscopy Society of America on the MSA homepage, little information as to why awards were bestowed is provided. In this initial installment of what will become an annual contribution to Microsocopy Today, Miaofang Chi, Chair of the MSA Awards Committee, and I provide a perspective on the important contributions of the 2020 Award winners. The information presented here represents a short summary of information provided in the awardees’ nomination packages. Guidelines, including deadlines for nominating individuals for these and other MSA awards, can be found by following the above link.

  • Facile synthesis of Pt–Ag octahedral and tetrahedral nanocrystals with enhanced activity and durability toward methanol oxidation

  • Ming Zhao, Xuan Yang, Zachary D. Hood, Miaofang Chi, Younan Xia
  • Journal: Journal of Materials Research / Volume 33 / Issue 23 / 14 December 2018
  • Published online by Cambridge University Press: 08 October 2018, pp. 3891-3897
  • Print publication: 14 December 2018

  • Engineering the surface structure, together with the incorporation of a second metal, is an effective strategy for boosting the catalytic activities of Pt-based catalysts toward various reactions. Here, we report a facile approach to the synthesis of Pt–Ag octahedral and tetrahedral nanocrystals covered by concave surfaces. The presence of the Ag(I) precursor not only facilitated the reduction of the Pt(IV) precursor but also led to the formation of concaved facets on the Pt–Ag nanocrystals. Besides, poly(vinylpyrrolidone) (PVP) was demonstrated to serve as a co-reductant, in addition to its role as a colloidal stabilizer. Using PVP with different molecular weights, we were able to tune the size of the Pt–Ag nanocrystals in the range of 9–25 and 14–32 nm for the octahedral and tetrahedral shapes, respectively. The Pt–Ag nanocrystals exhibited 4.6- and 2.0-fold enhancements in terms of specific and mass activities, respectively, toward methanol oxidation, when benchmarked against the commercial Pt/C catalyst. After 1000 cycles of the accelerated tests, the specific and mass activities of the Pt–Ag nanocrystals were still 3.6 and 1.6 times as high as those of the original commercial Pt/C.

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