[LA-SiGMA] LI-LA-SiGMA seminar Wednesday, June 1st

[Dentcho Genov]

Dear All,

 

Our next LI-LA-SiGMA seminar will be on Wednesday, June 1st at 2.30pm. The
seminar will be broadcasted from SC 2049 at UNO. Our speaker is Dr. Valeri
Petkov, Dept. Physics, CMU. Also, we need decide who will take over the
management of the seminar since my tenure has ended.

 

Title: Nanostructure by high-energy XRD and atomic pair distribution
functions.

 

Abstract:  Knowledge of the atomic-scale structure is an important
prerequisite to understanding, predicting and improving properties of
materials. With bulk materials it is easily obtained by traditional (Bragg)
x-ray diffraction. However, when the physical size of materials is reduced
to nanoscale dimensions Bragg x-ray diffraction is difficult to apply. The
reason is that the diffraction patterns of nanosized materials show a
limited number of Bragg peaks, if any, and a very pronounced diffuse
component. The problem may be solved by employing a non-traditional approach
involving high-energy x-ray diffraction and atomic pair distribution
function data analysis [1]. In the talk, the essentials of this approach
will be introduced and its great potential demonstrated with results from
several recent studies on nanostructured metallic (Au and PtPd [2]), oxidic
(BaTiO3, V2O5, TiO2, Fe2O3 [3]), semiconductor (CdTe, PbSe [4]) and organic
(PAMAM dendrimers [5]) materials.

 

[1] V. Petkov Materials Today 11 (2008) 28.  

[2] V. Petkov, N. Bedford, M. R. Knecht , Mi. G. Weir , R. M. Crooks ,
W.Tang ,G. Henkelman  and A. Frenkel  J. Phys. Chem.  C 112 (2008)  8907; V.
Petkov, T. Ohta, Y. Hou  and Y. Ren  J. Phys. Chem. C 111 (2007) 714.

[3] V. Petkov, V. Buscaglia, M. Buscaglia, Z. Zhao and Y. Ren  Phys. Rev. B
78 (2008)  054107; V. Petkov, P. Y. Zavalij, S. Lutta, M. S. Whittingham, V.
Parvanov and S. Shastri Phys. Rev. B 69. (2004) 085410;  S. K. Pradhan, Y.
Mao, S. S. Wong, P. Chupas and Valeri Petkov Chem. Mat. 19 (2007) 6180; V.
Petkov, P. D. Cozzoli, R. Buonsanti, R.Cingolani, and Y.Ren  JACS Comm. 131
(2009) 14264.

[4] S. K. Pradhan,  Z. T. Deng, F. Tang, C. Wang, Y. Ren , P. Moeck and V.
Petkov J. Appl. Phys. 102 (2007) 044304; V. Petkov, I. Moreels, Z. Hens and
Y. Ren  Phys. Rev. Lett (2010), submitted.

[5] V. Petkov, V. Parvanov,  D. Tomalia, D. Swanson, D. Bergstrom and  T.
Vogt, Solid State Comm. 134 (2005) 671

 

The access grid locations are as follow: 

 

Tulane: AG room: 403 Stanley Thomas Hall

University of Louisiana at Lafayette: AG room: Abdalla Hall

Southern University:  AG room: 218 Moore Hall

UNO: AG room:  SC 2002

LSU: AG room:  Johnston 338

LATECH: AG room: 234 Netken Hall

 

Please, distribute this email to your students and colleagues.

 

Kind Regards,

Dentcho

 

----

Dentcho A. Genov, PhD

The LONI Institute Fellow

Assistant Professor of Physics & Electrical Engineering

Louisiana Tech University, Engineering Annex, Room 220

599 W Arizona Ave, Ruston LA 71272

 

Phone: (318) 257-4190, Fax: (318) 257-2777

Webpage: http://www.phys.latech.edu/~dgenov/

 

 

 

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