Curriculum Vitae

 

Winnie Wong-Ng

 

(download .doc version here)


Winnie Kwai-Wah Wong-Ng


ADDRESS: A256 MATLS, NIST, Gaithersburg, MD 20899; 301-975-5791; [email protected]


EDUCATION: 

B.Sc., 1969, Chinese University of Hong Kong. Chemistry/Physics. 

Ph.D., 1974, Louisiana State University at Baton Rouge, Louisiana.  Major: inorganic chemistry, Minor: physical chemistry.

 

PROFESSIONAL SOCIETIES: 

American Crystallographic Association (ACA), American Ceramic Society (ACerS), Materials Research Society (MRS), American Association for the Advancement of Science (AAAS), and International Center for Diffraction Data (ICDD)

  

PROFESSIONAL EXPERIENCE: 


1988-present: NIST, research chemist, project leader

•  Energy and Environmental related research 

The main goal of the energy-related research is to establish metrology for relating properties and performance of advanced materials to the specifics of their processing and manufacturing routes.  This is accomplished via analysis and understanding of phase relationships, bulk chemistry, surface chemistry, and microstructure. Our research addresses various near-term and long-term materials problems in the areas of energy conversion (thermoelectric materials), carbon mitigation, and phase relationships in high Tc superconductors. The three principal projects comprising this research are summarized as follows. 


(1) Standards, metrology, and data for energy conversion materials (2005- present) 

For this project, it was necessary for the project team to develop new approaches to thermoelectric metrology.  As a result, we have designed and completed the development of a new set of tools for screening the Seebeck coefficient, resistance, and thermal conductivity of thermoelectric thin films (Appl. Phys. Lett. 91, 132102, 2007; Appl. Surface Science, 254 765-767, 2007; Jap. J. Appl. Phys, 48 05EB02, 2009 ; Rev. Sci. Instrum, 84, 115110, 2013). The deposition and characterization of thin films provides an efficient alternative to the time-consuming and material-intensive fabrication of bulk materials for screening.  Efficiency of thermoelectric screening can be further improved by the use of combinatorial techniques, which we have successfully demonstrated. We continue to work on structure/property relationships of various material systems (Acta Materiala, 61, 7693-7704,2013; Adv. Functional Mater. 20, 755, 2010; Appl. Phys. Lett., 94, 022110, 2009; J. Appl. Phys. 107, 033508, 2010; J. Solid State Chem. 215, 128-134, 2014; J. Appl. Phy, 119, 055101 (2016).). We have completed the development of a low-temperature Seebeck coefficient standard reference material, (J. Mater. Res., 26 (15), 1983-1992, 2011; Appl. Phys. A, 96 511-514, 2009; J. Res. Nat'l Inst Stand. & Tech. 114 (1), 37-55, 2009) which have fulfilled a major need for the thermoelectric R&D community. Currently we are working on the development of a high temperature Seebeck coefficient standard (J. Electronic Materials 44, 1998, 2015). 


    (2) Carbon Mitigation Measurements (2009-present) 

    The main goal of this project is to develop metrologies and standards, and also structural, thermodynamic, and kinetic data for solid sorbent materials (including nano/mesoporous ceramics) to be used for CO2 capture/sequestration applications. As coal-burning power plants will be an important part of energy production for the foreseeable future, reduction of CO2 emissions from these plants using efficient and low cost sorbents is critical for global sustainability (Environmental Science and Technol. 47, 11960-11975, 2013). Sorbent materials of interest include zeolites, molecular sieves, and metal-organic-framework (MOFs) (CryEngComm., 15, 4684-4693, 2013; Microporous and Mesoporous Materials, 17295-104, 2013; Solid State Sciences, 52, 1-9 (2016)). Crucial factors for understanding the efficiency of porous sorbent materials are the pore structure, and the chemical and physical reactivity of CO2 with the pores. Neutron diffraction, synchrotron X-ray absorption spectroscopy, and small angle  X-ray and neutron scattering (SAXS and SANS) techniques enable in-situ, real-time measurements of  the structure of sorbents, pore interconnectivity and structure, CO2 distribution, and local adsorbent/CO bonding (Angew Chem. Int. Ed. 50, 10888-10892,2011; J  Alloys and Compounds, 647, 24-34, 2015). To study simultaneously and also in parallel the complicated material phenomena associated with CO2 capture, we are in the process of designing specialized hybrid instruments. National Energy Technology Laboratory (NETL) and Boise State University are two of our main collaborators.  


(3) Phase relations in High Tc Superconductors  (1986-2007)

As an integral part of a DOE R&D program, we determined phase equilibria, crystal structures and  phase  diagrams for the three generations of superconductor materials:  1st generation, the (Bi,Pb)-Sr-Ca- Cu-O systems (J. Mater. Res.,15 (2) 296-305, 2000; J. Am. Ceram. Soc. 81(7), 1829,1998); 2nd generation, Ba-R-Cu-O systems (R=lanthanides and yttrium) (Physica C, 439(2) 93-100,  2006);  and 3rd generation, MgB2  systems (e.g. IEEE Trans. Appl.  Superconductivity, 15 [2], 3227-3229, 2005). During the course of this work, we developed extensive collaborations with several DOE laboratories. Our studies involved bulk materials, single crystals (e.g. Phys. Rev. B 41, 4220, 1990) and thin films (the BaF2 process for coated conductor applications, e.g. Appl. Phys. Lett, 88 102507, 2006; Appl. Phys. Lett.  90, 102508, 2007 ). In addition, we also studied the interactions (phase equilibria and kinetics) of superconductor phases with buffer layers and substrates of the coated conductors (e.g. J. Solid State Chem., 470(5-6) 345-351, 2010). Various experimental challenges were successfully dealt with, including atmospheric contamination, substrate reaction, gas- phase interactions, and the complexity of multiphase products. Our results were used to guide materials processing for optimal onset Tc, critical current density, high-field behavior, mechanical properties, and cost/performance ratio, including the development of novel flux-pinning techniques.  This work resulted in a number of awards and more than 100 publications. In the course of the project we were awarded the highest rating three times during the required annual DOE peer reviews.


•  Crystallographic studies of technologically important high temperature oxides, including microwave ferroelectric, magnetic, thermoelectric materials and related materials using single crystal X-ray diffraction, and powder X-ray and neutron Rietveld refinement methods. In order to  provide industrial, academic and government laboratories with an SRM for the alignment of single crystal X-ray diffractometers, an international project was completed around FY2000 which involved two major undertakings: (1) an  international round-robin (working with ACA) to demonstrate the viability of the selected possible standard, and (2) the certification of a SRM. Both projects were concluded successfully. The SRM1990 is a set of Cr-doped Al2O3 ruby spheres. The certification process used 4 well-aligned diffractometers at Lucent Technologies and at NRC of Canada, confirmed by a Guinier-Hägg camera at the US Geological Survey. These standards are available through the NIST SRM office (http://www.nist.gov/srm).  (J. Res. Nat'l Institute Stand. Technol., 106 (6), 1071, 2002)


•   Ab initio molecular orbital calculations to understand the environmentally enhanced crack-growth phenomena in silica (1988-1991) (J. Am. Ceram. Soc., 75 (11) 3097, 1992). Mechanical failure of brittle materials is a severe problem which limits the use of ceramics in a variety of potential structural applications. The magnitude of this problem increases in the presence of active environmental molecules which enhance crack growth; for example, it has long been recognized that water assists the fracture of silica glass, without a good understanding of the process. We have applied MO calculations to obtain insight into the atomistic and electronic behaviors of water interactions with SiO2. As an H2O molecule approaches the silica crack-tip, the distorted initial state of the crack-tip (due to strain) reduces steric hindrance to the approach of water, enhances the attraction of the water molecule through increased polarization of the Si-O bond, and reduces the reaction energy barrier (Fracture Mechanics of Ceramics, Vol. 12, 219, 1996). The success of these studies has significantly increased our understanding of crack propagation. 


•   Standard X-ray powder diffraction patterns of electronic materials and materials for CO2 capture applications (to be included in the X-ray Powder Diffraction File (PDF), 1988-present.


1985-1988: University of Maryland, National Bureau of Standards (NBS), research scientist.

• X-ray diffraction standard reference patterns for ceramic materials. 

• X-ray diffraction characterization of high Tc superconductor materials.

• Certification of d-spacing Standard Reference Material for X-ray diffraction (Silicon, SRM 640b).


1981-1985: International Centre for Diffraction Data (ICDD). X-ray Crystallographer and Critical Review Scientist, at National Bureau of Standards (1983-85), at ICDD Headquarters, Swarthmore, Pennsylvania (1981-83).  

• Comprehensive review of reference patterns in the Powder Diffraction File; computerized database.  

• High quality X-ray diffraction reference patterns from experimental measurements.   

• Computer software development to assist pattern analysis and data review.   

 

1974-1981: Chemistry Department, University of Toronto. Research associate and lecturer

• Taught inorganic, physical chemistry and general chemistry courses.

• Research in areas of theoretical and experimental crystallography. Theoretical studies involved investigation of intermolecular forces in solid dihalogens in order to explain their structures (Proc. Royal Soc. London Ser A 367, 29, 1979). Experimental X-ray crystallography research included a wide scope of compounds: organic, inorganic, organometallic and alloy, with emphasis on finding solutions to difficult problems of disordered, and twinned structures (Acta. Cryst. B 40, 151, 1984). 

• Computer software development in support of experimental and theoretical crystallographic research activities.


1969-1974:  Chemistry Department, Louisiana State University at Baton Rouge, LA. 

• Laboratory instructor, tutor, and research assistant 

• Research work included X-ray crystallography, computer software development, and molecular orbital calculations. 


AWARDS/HONORS/RECOGNITIONS:

•Fellow of the American Crystallographic Association (2014)

•ICDD Leadership Award, 2012, 2014

•US Department of Commerce Bronze Medal Award  (for exceptional leadership in the provision of phase equilibrium data for high-temperature superconducting ceramic materials), 2008.

•Richard and Patricia Spriggs Phase Equilibria Award, from American Ceramic Society, 2007

•Howard McMurdie Award (for seminal contribution to the Powder Diffraction File), from ICDD, 2004

•US Department of Commerce Bronze Medal Award (for high Tc superconductor research), 2002

•PDF-4 Consulting Editor Award from ICDD, 2002 

•Fellow of American Ceramic Society, 2002

•Fellow of International Centre for Diffraction Data, 2000

•Best poster award, ICDD annual technical meeting, 2013, 2015

•Recognitions from ACerS for serving as the Chair of the Electronics Division, 2005-2006

•Recognitions from MRS for organizing symposia in 2005, 1999 and a short course in 1992

•Recognitions from ACerS for organizing symposia in 1989, 1999, 2001-2009 continuously

•Recognitions from US Department of Energy (DOE) for receiving the highest scores in DOE Program Peer Review - Wire/Tape Development Session of the Superconductivity Program for Electric System,  2001, 1999, and 1997 (plaque, certificate, or letter)

•Recognitions from DOE for significant accomplishments in DOE Strategic Research Session of the Superconductivity Program for Electric System, 2005 

•Recognitions from Association of NIST Asian Pacific Americans for serving as President, 2000-2003

•ICDD citations for outstanding contribution to the Powder Diffraction File (1996, 1998, 2002-2006).


PUBLICATIONS:  >300

PRESENTATIONS (as presenter): > 250 (invited talks > 60) 

SYMPOSIA/WORKSHOPS ORGANIZED:  > 40


PROFESSIONAL ACTIVITIES:

• American Crystallographic Association (ACA)

•Chair, (Data, Standards and Computing) Committee, 2007-2010

•Chair, Warren Award Committee, 2004-2005

•Member, Continuing Education Committee, 2001-2003

•Chair, Nominating Committee, 2003

•Local chair, ACA annual meeting, Arlington, VA, July 19-23, 1998

• US National Committee for Crystallography (USNC/Cr)

•Member-at-large, 1999

•Secretary and Treasurer, 2000-2003

• International Centre for Diffraction Data (ICDD)

•Board of Directors, Member-at-large, 2010-2014

•Editor, Journal Powder Diffraction, International Reports section, 1999-present

•Chair, Ceramics Subcommittee, 1992-1999, 2005-presenet 

•Chair, Howard McMurdie Award Committee, 2006

•Member, Scholarship Committees, 2004-present

•Chair, Membership Committee, 1999-2004 

•Consulting editor, Powder X-ray Diffraction File (PDF), 1993-pesent

• American Ceramic Society (ACerS)

•Electronic Division Trustee, 2013-2016

•Associate Editor, Journal of American Ceramic Society, 2012-present

•Chair, Electronics Division, 2005-2006

•Member, Publication Committee, 2013-2015

•Member, Nominating Committee, 2008-2010

•Program Chair, Electronics Division, 2003-2004

•Chair, Awards Committee, Electronics Division, 2000-2002

•Chair, Membership Committee, Electronics Division, 1997-2000

• Applied Superconductivity Conference (ASC) Board

    •Member, Board of Directors (2006-2012)