G. Mike BancroftG. Mike Bancroft
Professor
B.Sc. (Manitoba), M.Sc. (Manitoba)
Ph.D. (Cambridge), Sc.D. (Cambridge)
FRSC
O.C.
D.Sc. (Hon) Western Ontario
D.Sc. (Hon) Manitoba
D.Cl. (Hon) St. John’s College, Manitoba
Office: Chemistry 070
Phone: (519) 661-4117
Fax: (519) 661-3022

gmbancro@uwo.ca

Synchrotron Radiation Studies, High Resolution Photoelectron Spectroscopy, Geochemical Surface Studies, Tribochemical Studies



Awards:

    FRSC
    Bucke Award
    CIC Medal
    Morley Award
    Steacie Fellow
    Guggenheim Fellow
    Meldola Medal
    Alcan Award
    Herzberg Award
    Harrison Prize
    Rutherford Medal
    Montreal Medal
    Officer of the Order of Canada

Current Research Programs:

My research is divided into three areas: first, spectroscopic studies (photoelectron, Auger, resonance Auger, photoabsorption) in the UV-soft X-ray region (20 eV-4,000 eV) on inorganic and organometallic molecules, minerals, and thin films using monochromatized synchrotron radiation at the Canadian Light Source (CLS) in Saskatoon; second, tribochemical studies of antiwear films from engine oil additives; and third, photoelectron studies of non-conductor minerals and glasses.

NEXAFS spectra (at the P and S L-edge and K-edge, B and O K-edge, Zn L-edge) have been extremely useful for characterizing the thickness and the chemical state of elements in antiwear films obtained by decomposition of Zn dithiophosphates (ZDDP) and other novel antiwear compounds in engine oil. The mechanism of this decomposition, often with dispersants and detergents (and in commercial engine oils), is being elucidated with the aim of improving the antiwear performance of these films , and in developing new antiwear additives. This work is being performed in collaboration with Chevron Oil Co. in Richmond, California.

The new Kratos XPS in Surface Science Western is being used to obtain high resolution spectra of non-conductors at optimal resolutions. The resolution is now greatly enhanced so that we can quantify the ratio of “bonding” to “non-bonding” oxygens in silicate and germinate glasses using the O 1s spectra, and determine the initial surface dissolution mechanisms of silicate minerals. Fundamental linewidth studies (using high resolution synchrotron radiation at the CLS at very low temperatures) are being undertaken to determine the controlling factors on the magnitude of non-conductor linewidths.

Selected Publications:

H.W. Nesbitt, G.M. Bancroft, G.S. Henderson, R.Ho, K. Dalby, Y Huang and Z. Yan, 2011, Bridging and Non-bridging Oxygen in  Na2O-SiO2  glasses: Comparison of X-ray Photoelectron Spectroscopy (XPS) with Nuclear Magnetic Resonance Results, Journal of Non-Crystalline Solids, 357, 170-180.

L.G. Yu, E.S. Yamaguchi, M. Kasrai, and G.M. Bancroft, 2011, Study of Si-based additives:Wear and Chemistry, Tribology International, 44 , 692-701.

J.G. Zhou, J. Thompson, J. Cutler, R. Blyth, M. Kasrai, G.M. Bancroft, and E. Yamaguchi, 2010, Resolving the Chemical Variation in Thin ZDDP Tribolfilms by X-Ray Photoelectron Spectroscopy using Synchrotron Radiation: Evidence for Ultraphosphates and Organic P and S Compounds. Tribology Letters, 39, 101-107.     

G.M. Bancroft, H.W. Nesbitt, R.Ho, D.M. Shaw, J.S. Tse and M.C. Biesinger, 2009, Towards a Comprehensive Understanding od Solid State Core-Level XPS Linewidths: Experimental and Theoretical Studies on the Si 2p and O 1s Linewidths in Silicates, Phys. Rev. B,  80, 075405 (1-13).

R. Puttner , Y.F.Hu , G.M. Bancroft, A. Kivimaki, H. Aksela, and S.  Aksela, 2008, Detailed  Analysis of the Br 3d-1nl ( n=6-9 ) resonant Auger Spectra of HBr, Physical ReviewA, 77, 032705 (1-8).     

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