Dr. Bhanu P. S. Chauhan
Professor And Chairperson
Education and Training
Post-doctoral fellow, North Dakota State Univ, 97-2000
Post-doctoral fellow, National Institute of Materials and Chemical Research, Japan, 95-97
Ph.D., Chemistry, Montpellier University II, Montpellier, France, 1995
M. Sc. Kanpur University, India, 1988
My research interests bridge traditional disciplines covering several aspects of synthetic inorganic, materials and polymer chemistry. Research in my group is inherently interdisciplinary in nature and accommodates students with interests in all areas of chemistry. The research provides a broad training in small molecule, polymer, and materials synthesis and characterization techniques and prepares students for work in either industry or academia. A very concise description of my research program is outlined below:
1. New Strategies to Nanosized Functional Materials
Most nanosynthetic studies in our group are inspired by our hypothesis that stabilization of highly active metal nanoparticles can be achieved by the “meatball-spaghetti” analogy. In this model, preparation of functional metallic nanoparticles is viewed as the preparation of “meatball-spaghetti” dish. This analogy is based on our hypothesis that the aggregation of the meatballs (metal nanoclusters) can be prevented if enough spaghetti (flexible polymeric structures) is present to physically wrap the meatballs during the formation process. Due to very weak surface passivation imparted by stabilizing agent, such type of nanoclusters are expected to show superior activity and selectivity as reactive intermediates (or catalysts) over the nanoparticles passivated by strong coordinating ligands.
The most important and fundamental difference of this strategy from other polymer-stabilized systems is that, in this hypothesis the polymer does not contain the coordinating ligands, which can strongly passivate the nanoclusters. Moreover, the substituents of the polymer are used to induce the reduction of metal salts avoiding utilization of any external reducing agent.
2. Catalysis and Transition metal-heteroatom Chemistry
Our interests in this area cover all aspects of selective catalysis, and especially in the design, discovery and study of systems that mediate fundamentally interesting and useful reactions. Our research in this area is driven by the need to discover catalytic systems, which combine the advantages of both homogeneous and heterogeneous catalysis. This research has led us to “soluble” analogues of heterogeneous catalysts in the form of active metal nanoclusters.
3. Polymer and Material Chemistry of Silicon
Our research in this area targets novel materials with specific structural, electronic, optical and/or catalytic properties. The synthetic strategy to build these materials involves low temperature, chemically directed catalytic transformations. Research in this area can be divided in following major categories:
(i) Synthesis and Study of New “Si” Based Functional Polymers
We are heavily involved with the synthesis, property profile study, and application of new silicon based hybrid inorganic/organic polymers. At present our efforts are focused on the new class of functional
polysiloxane/polycarbosilane polymers. Our goal is to achieve the polymers having various types of substituents on the backbone Si-atoms in one to two step synthetic routes.
(ii) Vehicles for Controlled and Targeted Drug Delivery
Our group in this area targets to develop new materials which can provide control over the drug delivery in cases where, traditional oral or injectable drug formulations cannot be used. As an example, we are trying to devise drug conjugates which may address situations requiring the slow release of water-soluble drugs, the fast release of low-solubility drugs etc. We are also trying to generate new nano-particulate systems, based on carriers that can dissolve or degrade and be readily eliminated. Long term goal of this research is to synthesize drug conjugates , which are inert, biocompatible, mecha-nically strong, and safe from accidental release.
“Pd-Nanoparticle Catalyzed Poly(hydro)siloxane Grafting: A Selective and Efficient Approach to Organic/Inorganic Hybrid Polymers” Bhanu P. S. Chauhan, Jitendra S. Rathore, and Moni Chauhan “Hybrid Nanomaterials: Synthesis, Characterization, and Applications” Chapter 3, Page 65-95, 2011; (Editor: Bhanu P. S. Chauhan; Pub: John Wiley & Sons, Inc)
“Long-chain silanes as reducing agents part 1: a facile, efficient and selective route to amine and phosphine-stabilized active pd- nanoparticles“ Bhanu P. S. Chauhan*; Ramani, Leon, P. K.; Manik Mandal, and Kenrick Lewis Appl. Organometal. Chem. 2010, 24, 222-228.
"New Avenues, New Outcomes: Nanoparticle Catalysis for Polymer Makeovers" Bhanu P. S. Chauhan , Bharathi Balagam, Jitendra S. Rathore and Alok Sarkar Invited Book Chapter, "Silicon Polymers", Page 3-18, 2008, ( Publisher: Springer)
"Silyl Functionalization of Polyolefines" Bhanu P. S. Chauhan and Bharthi Balagam. Macromolecules 2006, 39, 2010 (Top 15 Most Assessed, Jan-Mar)
"Nanoengineering of Metallic Solutions through silicones" Bhanu P. S. Chauhan, Rajesh Sardar, Umar Latif , Moni Chauhan and William Lamoreaux. Acta. Chim. Slov. 2005, 52, 361-370 (Cover Article)
"Regioselective Synthesis of Multifunctional Hybrid Polysiloxanes Achieved By Pt-Nanocluster Catalysis" Bhanu P. S. Chauhan and Jitendra S. Rathore J. Am. Chem. Soc. 2005, 127, 5790-91 (Science Highlight Editor’s Choice)
"Self-Assembled Stable Silver Nanoclusters and Nanonecklace Formation: Poly(methylhydrosiloxane)-Mediated One-Pot Route to Organosols” Bhanu P. S. Chauhan and Rajesh Sardar Macromolecules 2004, 37, 5136-5139 (Cover Article, 01/2005-03/2005)
"Dehydrogenative Coupling as an Efficient Route to Ferrocene Functionalized Siloxanes"Philip Boudjouk, Zoha Al-Badri and Bhanu P. S. Chauhan J. Organometallic Chem. 2004, 689, 3468-3471.
"Theoretical Study of the Effects of Templated Materials on Aggregate Formation"
"Synthesis of Polysiloxane Stabilized Palladium Colloids and Evidence of their Participation in Silaesterification Reactions" Bhanu P. S. Chauhan, Jitendra S. Rathore, Moni Chauhan and Alexandra Krawichz J. Am. Chem. Soc. 2003, 125, 2876-2878
Department of Chemistry