Tapas Kar

Research Assistant Professor
Computational/Theoretical Chemistry

Email: tapas.kar@usu.edu

Tel: 1-435-797-7230

Fax: 1-435-797-3390

M. Sc, 1983, Indian Institute of Technology (IIT), Kharagpur, India

Ph. D, 1988, Indian Institute of Technology (IIT), Kharagpur, India

Visiting Scientist, 1990-91, Sevilla University, Spain

Alexander von Humboldt Fellow, 1991-93, Germany

Summer Faculty Fellow, 2003 & 2004, National Academics (USA)

Visiting Professor, 2004-05, Federal University of Santa Maria, Univ. of Sao Paulo

(Ribeirao Preto, San Carlos) and Univ. of Campinas, Brazil

Summer Faculty Fellow, 2005, American Society for Engineering Education (ASEE).

Visiting Professor (AvH), 2008, Ruhr University at Bochum, Germany.

Summer Faculty, 2009, US DoD High Performance Computing Modernization Program

(HPCMP)

Nanotechnology Initiative at Utah

Nanotech Companies at Utah:

http://www.nano-oxides.com/index.html

Nano Pet Health

Rocky Mountain Nano-Technology

Salt Lake City, Hilton City Center, Oct 13-13, 2011

Salt Lake City, Oct 15-16 2010

Salt Lake City, MARRIOTT CITY CENTER ·

Oct 15-16

USU nanoBio Symposium – March 17, 2008

October 16-17, 2008

Huntsman Cancer Institute Eccles Auditorium

University of Utah, Salt Lake City, UT

nanoUtah’07 Program Book

Keynote Lectures:

Dr Piotr Grodzinski(NIH/NCI)

Dr Chunfei Li - ONAMI Facilities

Technical Sessions:

15-min presentation list and abstracts

List of Posters and abstracts Sponsors & Exhibitors

nanoUtah 2006 – Technical Program

Conference Agenda & Schedule

List of 5-mins Presentation

Abstracts; List of Posters

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Nanotechnology Activities:

Ø Member, Nanotechnology Advisory Committee, State of Utah (2005-2008)

Ø Owner and Moderator – nanoUtah Weekly Newsgroup

Ø Member, Organizing committee, Nano and Giga Challenges in Electronics and Photonics.

Phoenix, Arizona, March 12-16, 2007

Ø Organizer: nanoUtah 2006 :Statewide NanoTech Conference, Salt Lake City, Utah, Oct 5, 2006

Ø Organizer: nanoUtah 2007 : Statewide NanoTech Conference, Salt Lake City, Utah, Oct 26, 2007

Ø Member, The NanoTechnology Group Inc. (Consortium for Global Education)

Ø http://www.thenanotechnologygroup.org/index.cfm

Ø Core team member, Physics “FLEXBOOK” ( Nanoscience Chapter), State Technology Department, Virginia, USA; 2008-09.

What is Nanotechnology?

A. Nanotechnology – Materials Today, PHYX2400 (Special topics course)

(Introductory course for Undergrad) (Spring)

B. NanoChemistry-I (PHYS-3500-003/Chem-3750-1) (Fall)

C. NanoChemistry-II (PHYS 5500) (Fall)

-:Presentation by Students:-

Fall-2005	Fall-2006
Use of Nano-Scale Materials for Water Purification.	Microscopy as a Means for Nano-Characterization
Space Elevators	Nano-bio-sensors
Nanomedicine and Cancer	Boron-Nitrogen Nanotubes
Molecular Gastronomy	Nanosolar
Nanotube Molecular Transporters	Nanotechnology and medicine
Quantum Dots: Science and Application	Nano-Risks
Quantum Dots

K-12 Nanoeducation:

Pilot project to integrate Nanotechnology at Utah’s High Schools.

Isolated stand-alone sections or Integrated part in appropriate places?

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Research Interests & Experience

Nanoscience and Nanotechnology: Doped Fullerenes and Nanotubes & Functionalized Nanotubes (SWCNTs)

Various Hydrogen (C-H---O/N, O/N-H---X) and Di-hydrogen Bonds in different media

ONIOM and SLDB methods & New Basis functions for Carbon Nanotubes

Proton transfer process at Ground and Excited states

Blue light emitting BCN and III-V nanomaterials

Li-nano-battery & Li-bonding

Nonlinear optical properties

Atmospheric chemistry

Chemical Bonding

The discovery of fullerenes (1985) and carbon-nanotubes (1991) opened a new field of research in science and technology and these exciting areas of research are well known as Nano-science and Nano-technology. My research interests lie mainly in the determination of structure and electrical, chemical and mechanical properties of hybrid BCN nano-materials using theoretical (ab initio and DFT) methods. We are also involved in understanding and improving the quality of Li-nano-batteries.

The full extent of the intriguing properties and potential uses of fullerenes and carbon nanotubes are only beginning to be realized. An even greater range of properties can be attained by replacing one or more pairs of C atoms by isoelectronic BN pairs. Variability introduced by these substitutions is engendered not only by the number of such replacements, but also in a multitude of different locations, leading to an enormous list of systems to be synthesized and analyzed. Quantum chemical calculations are used to assist in this process.

Chemical Modification (side-wall and end functionalization) of Carbon Nanotubes (SWCNTs)

ONIOM (QM/MM) or SLDB (same level of theory with different basis function): Modeling carbon nanotubes (SWNTs) using QM/MM method including ONIOM breaks the pi-networks of SWCNT and may not an appropriate technique to study chemical modification of nanotubes. We have recently shown that SLDB is more appropriate for such investigations for both side-wall and end-functionalized carbon nanotubes. [References: Chem. Phys. Lett. 392, 2004, 176-180 and 423 2006 126-130]. Moreover, periodic boundary condition does not apply to end-modification of the Nanotubes.

Collaborators:

Air Force Research Laboratory, AFRL (Dayton): Functionalized Carbon Nanotubes and NanoComposites.

NIST: Optical properties of doped carbon-based Nano-materials.

Federal University of Santa Maria, Brazil: III-V Semiconducting nanotubes.

Sao Paulo University, Ribeirao Preto, Brazil: H-bonding

Bengal Science & Engineering University, India: Nonlinear Optics (NLO).

Kalyani University, India: Coordination Chemistry

Utah State University, H₂-Storage using LiNH₂/Li₂NH

Tuebingen University, Bochum, Germany: Carbon nanotubes

Research Publications

Research area and number of publications

1. Various hydrogen bonding and proton transfer process in biological systems: 23

2. Fullerenes and carbon nanotubes: 18

3. Li-battery and p-cation interaction, Li-bond: 7

4. III-V Semiconducting Nanotubes: 2

5. Porphyrins: 3

7. Atmoshpheric Chemistry: 1

8. Tunable optical materials: 3

9. Nonlinear optical properties (NLO): 6

10. Applications of DFT methods: 3

11. Excited state proton transfer: 3

12. Multi-center bonding and non-classical systems: 10

13. Hardness and Chemical potential: 3

14. Chemical bonding: 11

15. Different population schemes: 5

List of Journals and number of publication:

1. Bulletin of the Chemical Society of Japan – 1

2. Chemical Communication -1

3. Chemical Physics Letters - 16

4. Chemical Reviews - 1

5. European Physical Journal B: Condensed Matter Physics - 1

6. Handbook of Theoretical and Computational Nanotechnology - 1

7. Indian Journal of Chemistry, A - 5

8. Inorganic Chemistry - 1

9. International Journal of Quantum Chemistry - 4

10. Journal of Biological Chemistry - 1

11. Journal of Chemical Education - 1

12. Journal of Chemical Physics - 2

13. Journal of Chemical Theory and Computation - 1

14. Journal of Computational and Theoretical Nanoscience - 1

15. Journal of Molecular Structure - 3

16. Journal of Physical Chemistry - 1

17. Journal of Physical Chemistry A - 23

18. Journal of Physical Chemistry B - 2

19. Journal of Physical Chemistry C - 2

20. Journal of the American Chemical Society – 5

21. Journal of Scientific and Industrial Research - 1

22. Nanotechnology - 2

23. Physical Review B: Condensed Matter and Materials Physics - 2

24. Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy - 1

25. THEOCHEM – 19

26. Theoretical Chemistry Accounts - 1

27. Polyhedron – 1

Published Articles (2001-2011):

102. The influence of the stacking orientation of C and BN stripes in the structure, energetics, and electronic properties of BC2N nanotubes, M Machado, T Kar and P Piquini, Nanotechnology 22 2011 205706.

101. IR Characterization of Tip-Functionalized Single-Wall Carbon Nanotubes, Tapas Kar, Steve Scheiner, Soumya S. Patnaik, Holger F. Bettinger, and Ajit K. Roy, J. Phys. Chem C 114 2010 20955-20961|

100. Analysis of the Reactivities of Protein C-H Bonds to H Atom Abstraction by OH Radical, Steve Scheiner and Tapas Kar, J. Am. Chem. Soc., 132 2010 16450-16459.

99. AlN, GaN, Al_xGa_1−xN nanotubes and GaN/Al_xGa_1−xN nanotube heterojunctions, James M. de Almeida, Tapas Kar and Paulo Piquini, Phys. Letters A 374 2010 877–881.

98. The Borazine and Benzene Homo- and Heterodimers, Holger. F. Bettinger and Tapas Kar, J. Phy. Chem A, 113 2009 3353.

97. The variants of hyperpolarizabilities in the SOS scheme: An application in the structure-property correlation study of Indigo-derivatives, Prasanta K. Nandi, Nabamita Panja, Tapan K. Ghanty and Tapas Kar, J. Phys. Chem. A. 113 2009 2623.

96. A novel approach for the design of a highly selective sulfate-ion-selective electrode Amarchand Sathyapalan, Anhong Zhou, Tapas Kar, Feng Zhou and Haibin Su, Chem. Commun., 2009 325.

95. Noncovalent p-p stacking and CH--p Interactions of Aromatics on the Surface of Single-Wall Carbon Nanotubes (SWNTs). Tapas Kar, Holger F. Bettinger, Steve Scheiner and Ajit K. Roy, J. Phys. Chem. C 112 2008 20070-20075.

94. Spectroscopic and Structural Signature of a CH--O H-bond, Steve Scheiner and Tapas Kar, J. Phys. Chem. A. 112 2008 11854-60.

93. An Attempt Towards Coordination Supramolecularity From Mn(II), Ni(II) And Cd(II) With A New Hexadentate [N4O2] Symmetrical Schiff Base Ligand: Syntheses, Crystal Structures, Electrical Conductivity And Optical Properties, Saikat Sarkar , Susobhan Biswas, Meng-Sheng Liao, Tapas Kar, Yildirim Aydogdu, Fethi Dagdelen, Golam Mostafa, Asoke Prasun Chattopadhyay, Glenn P. A. Yap, Rui-Hua Xie, Abu T. Khan, Kamalendu Dey, Polyhedron 27 2008 3370.

92. The Effect on Acidity of Size and Shape of Carboxylated Single-Wall Carbon Nanotubes. A DFT-SLDB Study, Tapas Kar, Steve Scheiner and Ajit K. Roy, Chem. Phys. Lett., 460 2008 255.

91. Theoretical Investigation on the Mechanism of Dehydriding Reaction LiH + NH₃ -> LiNH₂+ H₂, Tapas Kar, Steve Scheiner and Leijun Li, J. Mol. Struct. THEOCHEM. 857 2008 111-114.

90. Periodicity in Proton Conduction along a H-bonded Chain. Application to Biomolecules. Alexander Isaev, Tapas Kar and Steve Scheiner, Int. J. Quantum Chem. 108 2008 607-616.

89. Underlying Source of the Relation between Polypeptide Conformation and Strength of Hydrogen Bonds, Steve Scheiner and Tapas Kar, J. Mol. Structure, 844-845 2007 166-172.

88 Density functional theory calculations of ozone adsorption on sidewall single-wall carbon nanotubes with Stone-Wales defects, Brahim Akdim, Tapas Kar, Xiaofeng Duan, Ruth Pachter, Chem. Phys. Lett 445 2007 281-287.

87. Hyperpolarizabilities of hetero-cycle based chromophores: A semi-quantitative SOS scheme, Prasanta Kumar Nandi, Nabamita Panja and Tapas Kar, Chem. Phys. Lett , 444 2007 366.

86. Ultraviolet optical absorption spectra of water clusters: from molecular dimer to nanoscaled cage-like hexakaidecahedron, John R. H. Xie, Jijun Zhao, Tapas Kar, and Ralf Ludwig, Journal of Computational and Theoretical Nanoscience, 4, 2007 453-466.

85. Electronic Structure and Spectroscopic Properties of the Two Structural Isomers of Donor-Acceptor Substituted Sesquifulvalene in the Gas and Solution Phases – A Case Study of Sudden Polarization, Tapas Kar, Nabamita Panja and Prasanta Kumar Nandi, J. Phys. Chem A 110 2006 12684-12692.

84. Effects of O3 Adsorption on the Emission Properties of Single-Wall Carbon Nanotubes: A Density Functional Theory Study, B. Akdim, T. Kar, D.A. Shiffler, X. Duan and R. Pachter, Lecture Notes in Computer Science, Volume 3991 / 2006, pp. 373

83. Open-ended modified single-wall carbon nanotubes: A theoretical study of the effects of purification, Tapas Kar, Brahim Akdim, Xiaofeng Duan, and Ruth Pachter, Chem. Phys. Lett. 423 2006 126-130.

82. Spectroscopy, crystal structure, valance molecular orbital energy level diagram and DFT study of cis-[Cr(2,2^/-bipy)₂Cl₂](Cl)_0.38(PF₆)_0.62.Tapas Kar, Meng-Sheng Liao, Susobhan Biswas, Saikat Sarkar, Kamalendu Dey, Glenn P. A. Yapand Kevin Kreisel Spectrochimica Acta Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy 65 2006 882.

81. Theoretical investigation on the stability and properties of III-nitride nanotubes: BN-AlN junction, L. A. Thesing, P. Piquini and T. Kar, Nanotechnology, 17 2006 1637

80. Theoretical study of static second-order nonlinear optical properties of push-pull heteroquinonoid dimers, P. K. Nandi, K. Mandal and T. Kar, J. Mol. Struct. (THEOCHEM) 760 2006 235-244.

79. Cooperativity of Conventional and Unconventional Hydrogen Bonds involving Imidazole, Tapas Kar and Steve Scheiner, Int. J. Quantum Chem. 106(4) 2006 843-851

78.Effects of Peripheral Substituents on the Electronic Structure and Properties of Unligated and Ligated Metal Phthalocyanines, Metal = Fe, Co, Zn, Meng-Sheng Liao, John D. Watts, Ming-Ju Huang, Sergiu M. Gorun, Tapas Kar, Steve Scheiner; J Chem Theory Comput. 1 2005 1201.

77.Tunable optical properties of icosahedral, dodecahedral and tetrahedral clusters; Rui-Hua Xie, Garnett W. Bryant, Hijun Zhao, Tapas Kar and Vedene H. Smith, Jr.; Phys. Reb. B. 71 2005 125422.

76. Effect of Solvent upon CH--O Hydrogen Bonds with Implications for Protein Folding, Steve Scheiner and Tapas Kar, J. Phys. Chem B 109 2005 3681

75. Ab initio SCRF study of solvent effect on the nonlinear polarizabilities of different intramolecular charge-transfer (ICT) molecules, P.K. Nandi, K. Mandaland T. Kar, Theo. Chim. Acta., 114 2005 200.

74. Effects of Peripheral Substituents and Axial Ligands on the Electronic Structure and Properties of Iron Phthalocyanine. Meng-Sheng Liao, Tapas Kar, Sergiu M. Gorun and Steve Scheiner, Inorg. Chem. 43 2004 7151-7161.

73. Comparison of Cooperativity in C-H---O and OH---O hydrogen bonds. Tapas Kar and Steve Scheiner, J. Phys. Chem. A 108 2004 9161-9168.

72. Substitution Patterns in Mono BN-fullerenes: C_n ( n=20,24,28,32,36 and 40), Jayasree Pattanayak, Tapas Kar and Steve Scheiner, J. Phys. Chem., A 108 2004 7681-7685.

71. Functionalization of Single-Wall Carbon Nanotubes: An Assessment of Computational Methods, B. Akdim, T. Kar, X. Duan and R. Pachter, Lecture Notes in Computer Science, Volume 3037 / 2004, pp. 260 – 267.

70. A theoretical study of functionalized single-wall carbon nanotubes: ONIOM calculations, Tapas Kar, Brahim Akdim, Xiaofeng Duan and Ruth Pachter, Chem. Phys. Lett. 392, 2004, 176-180.

69. Tunable optical properties, excitations and absorption spectra of heterofullerenes: Theory and experiments. Rui-Xie, Garnett W. Bryant, Guangyu Sun, Tapas Kar, Zhongfang Chen, Vedene H. Smith, Jr., Yasuyuki Araki, Nikos Tagmatarchis, Hisanori Shinohara and Osamu Ito, Physical Review B, Rapid Communication , 69(20), 2004, 201403

68. Ab initio study of Si doped BN nanotubes, Silvete Guerini Tapas Kar and Paulo Piquini, Euro. Phys. J. B 38 2004 515.

67. Actinyls in expanded porphyrin. A relativistic density functional study; Meng-Sheng Liao, Tapas Kar and Steve Scheiner, J. Phys. Chem.A 108 2004 3056-3063.

66. Effect of structural changes in sesquifulvalene on the intramolecular charge transfer and nonlinear polarizations – a theoretical study, P. K. Nandi, K. Mondal and T. Kar, Chem. Phys. Lett. 381, 2003, 230-238.

65.Rules of BN substitution in BCN fullerenes. Separate BN and C zones, Tapas Kar, J. Pattanayak and Steve Scheiner, J. Phys. Chem 107, 2003, 8630-8637.

64. Theoretical study of the nonlinear polarizabilities in H₂N and NO₂substituted chromophores containing two hetero aromatic rings , K. Mandal, T. Kar, P.K. Nandiand S.P. Bhattacharyya, Chem. Phys. Lett. 376, 2003, 116-124.

63. Comparison between hydrogen and dihydrogen bonds among H₃BNH₃, H₂BNH₂ and NH₃, Tapas Kar and Steve Scheiner, J.Chem. Phys., 119, 2003 1473-1482.

62. Comparison of BN and AlN substitution on the structure and properties of C₆₀ fillerene, J. Pattanayak, Tapas Kar and Steve Scheiner, J. Phys. Chem. A 107, 2003, 4056-4065.

61. Comparison of Various Types of Hydrogen Bonds Involving Aromatic Amino Acids, S. Scheiner, Tapas Kar and J. Pattanayak, J. Am. Chem. Soc. 124, 2002, 13257-13264.

60. BN-substitution of Fullerenes: C₆₀ to C₁₂B₂₄N₂₄ CBN-ball, J. Pattanayak, Tapas Kar and Steve Scheiner, J. Phys. Chem. A 106, 2002, 2970-2978.

59. Red versus Blue-Shifting Hydrogen Bonds: Are There Fundamental Distinctions? Steve Scheiner and Tapas Kar, J. Phys. Chem. A 106, 2002, 1784-1789 .

58. Substituent effects upon protonation-induced red shift of phenyl-pyridine copolymers, Steve Scheiner and Tapas Kar, J. Phys. Chem. B 106, 2002 534-539.

57. Influence of Hybridization and Substitution upon the Properties of the CH··O Hydrogen Bond, Steve Scheiner, Slawomir J. Grabowski and Tapas Kar, J. Phys. Chem. A 105, 2001, 10607-10612.

56. Insertion of Lithium ions into carbon nanotubes: an ab initio and DFT study. Tapas Kar, Jayasree Pattanayak and Steve Scheiner, J. Phys. Chem. A 105 2001 10397-10403.

55. Electronic Structure, Stability and Nature of Bonding of the Complexes of C₂H₂ and C₂H₄ with H⁺, Li⁺ and Na⁺ Ions. Extensive Ab Initio and Density Functional Study. Tapas Kar, R. Ponec and A. B. Sannigrahi, J. Phys. Chem. A 105, 2001, 7737-7744.

54. Boron-Nitrogen (BN) Substitution Patterns in C/BN hybrid Fullerenes: C_60-2x(BN)_x (x = 1-7) - A Semi-empirical and density functional study. J. Pattanayak, T. Kar and S. Scheiner, J. Phys. Chem. A 105 (2001) 8376-8384.

53. Strenth of the C^aH---O Hydrogen bond of amino acid residues, S. Scheiner, T. Kar and Y. Gu, J. Bio/. Chem. 276 (2001) 9832-9837.

52. A study of the mechanism of the reaction between ozone and the chlorine atom using density functional theory, J. Tyrrell, T. Kar and L. J. Bartolotti, J. Phys. Chem. A 105 2001 4065-4070.

51. Comparison of ab Initio Hartree-Fock and Kohn-Sham Orbitals in the Calculation of Atomic Charge, Bond Index, and Valence, Tapas Kar, Janos G. Angyan and A. B. Sannigrahi, J. Phys. Chem A 104 (2000) 9953-9963; 105 (2001) 660.

Full List of Publications

BOOK Chapter:

R. H. Xie, T. Kar and Z. Li, Nonlinear Optical Properties of Carbon Nanostructures" contributing to "Handbook of Theoretical and Computational Nanotechnology" edited by Michael Rieth and Wolfram Schommers (American Scientific Publisher, 2006).

PRESENTATIONS AT PROFESSIONAL MEETINGS

1. International Workshop on the Science and Application of Nanotubes, East Lansing, Michigan, USA, July 24-27, 1999, Tapas Kar, Jayasree Pattanayak and Steve Scheiner, Theoretical investigation on the filling of carbon nanotube by H⁺, Li⁺ and H₂.

2. The World Association of Theoretically Oriented Chemist, WATOC-99, London, 1999, Tapas Kar, M. Cuma and Steve Scheiner, BN-substituted carbon compounds, BxCyNz: An Abinitio Study.

3. Technologies for the future, Texas, Aug, 2000. Tapas Kar, Jayasree Pattanayak and Steve Scheiner, Li-ion nano battery – A theoretical Study.

4. 2^ndInternational Workshop on the Science and Application of Nanotubes, NT01, Potsdam, Germany, July 22-25, 2001, Tapas Kar, Jayasree Pattanayak and Steve Scheiner

a. BN substituted carbon compounds: A theoretical study,

b. Theoretical investigation on the Li⁺ intercalation in carbon nanotubes.

5. 223rd ACS National Meeting, Orlando, FL, United States, April 7-11, 2002, Tapas Kar, and Steve Scheiner, Substituent effects upon protonation-induced red shift of phenyl-pyridine copolymers.

6. International Conference on the Science and Application of Nanotubes, NT02, Boston College, Boston, USA, July 6-12, 2002. Tapas Kar, Jayasree Pattanayak and Steve Scheiner, Boron and Nitrogen Rich BCN Fullerenes: A Theoretical Study.

7. 2004 Hawaii International conference on Sciences, Honolulu. Jan 15-18, 2004.

A) Effect of Solvents on C-H^…O Hydrogen Bond: A Theoretical Study, Tapas Kar and Steve Scheiner.

B) Gas-phase acidity of Carboxylated Single-wall Carbon Nanotubes, Tapas Kar, Brahim Akdim, Xiaofeng F. Duan and Ruth Pachter

C) Theoretical investigation of mono BN-substituted lower fullerenes C_n, where n = 20, 24, 28, 32, 36 and 40. Jayasree Pattanayak, Tapas Kar and Steve Scheiner.

8. Horizons 2004, Technology Conference at Salt Lake City, Oct 11-13, 2004.; Panelist of Advanced Materials, “Pilot Program for Nanotechnology Initiative at Utah”

9. APS March’2005 Meeting, Los Angeles, CA, Theoretical Study of Side Wall Ozonation of Single-Wall Carbon Nanotubes Brahim Akdim , Xiaofeng Duan , Tapas Kar , Ruth Pachter

10. APS March 2006 Meeting, Baltimore, MD, Effects of the Modification of Single- and Double-Wall Carbon Nanotubes: A Theoretical Study of Field Emission Properties Brahim Akdim , Tapas Kar , Xiaofeng Duan , Ruth Pachter

11. Optics and Photonics 2006, 13 - 17 August 2006 San Diego, CA. “Pilot program to integrate nanotechnology at Utah’s high schools” Annie Kurtz, Melissa Anderson and Tapas Kar.

INVITED SEMINAR SPEAKER

Sevilla University, Spain, February, 1991

Hannover University, Germany, 1992

University of Erlangen, Germany, Auh-1993

Southern Illinois University, Carbondale, 1995

Utah State University, Logan, Oct 2000

Caesar Lab, Bonn, Germany, Aug-2001

University of Bonn, Germany, Sept-2001

Wright-Patterson Air Force Base, OH, Sep-2002

Federal University of Santa Maria, Brazil, Dec-2004

University of Campinas, Brazil, Jan-2005

University of Sao Paulo, San Carlos, Jan-2005

University of Sao Paulo, Ribeirao Preto, Feb-05

Utah State Univ, Phys Dept, Nov 05

Bengal Science and Engineering University, Kolkata, India, April-06

Indian Institute of Technology (IIT), Delhi, India, April-06

National Physical Laboratory (NPL), New Delhi, India, April-06

Optics and Photonics, Nanomodeling II, S.P.I.E Conference, San Diego, Aug 14, 2006

Computer Society of India, Kolkata Chapter – May 05, 2007 – Kolkata, India

InTech High School, Logan, UT – Aug 31, 2007

“NanoTech in India” – Utah State Gov – International Events, June 2009.

Department of Chemistry and Biochemistry

Utah State University

Logan, UT 84322-0300

Tel. (435) 797-7230; FAX (435) 797-3390

E-mail: tapas.kar@usu.edu

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