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Eberly College of Science Department of Chemistry
Ayusman Sen

Ayusman Sen

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  • Distinguished Professor of Chemistry
Office:
440 Chemistry Building
University Park, PA 16802
Email:
(814) 863-2460

Education:

  1. 1970: B.Sc. (Honours), University of Calcutta, India
  2. 1973: M. Sc., Indian Institute of Technology, Kanpur, India
  3. 1978: Ph. D., University of Chicago, USA

Honors and Awards:

  1. 1982 – 1984 Young Investigator Award, Chevron Research Company
  2. 1984 – 1988 Alfred P. Sloan Research Fellow
  3. 1987 – 1988 Paul J. Flory Sabbatical Award, IBM
  4. 1999 – 2000 Iberdrola Visiting Professor, University of Valladolid, Spain
  5. 2003 Faculty Scholar Medal, Penn State University
  6. 2005 Elected Fellow, American Association for the Advancement of Science
  7. 2009 Invited Distinguished Scientist, National Institute for Materials Science, Japan
  8. 2010 - Adjunct Professor, International Centre for Materials Science,
  9. Jawaharlal Nehru Centre for Advanced Scientific Research, India
  10. 2011 Medal, Chemical Research Society of India (CRSI)
  11. 2013 Member, Scientific Advisory Board, Max Planck Institute for
  12. Intelligent Systems, Germany

Selected Publications:

“Bmimetic Behavior of Synthetic Particles: From Microscopic Randomness to Macroscopic Control,” Yiying Hong, Darrell Velegol, Neetu Chaturvedi, and Ayusman Sen, Phys. Chem. Chem. Phys., 2010, 12, 1423.

“Emergent, Collective Oscillations of Self-Mobile Particles and Patterned Surfaces under Redox Conditions,’ Michael E. Ibele, Paul E. Lammert, Vincent H. Crespi, and Ayusman Sen, ACS Nano, 2010, 4, 4845.

“Light-Driven Titanium Dioxide-Based Reversible Micro Fireworks and Micro-motor/Micro-pump Systems,” Yiying Hong, Misael Diaz, Ubaldo M. Córdova-Figueroa, and Ayusman Sen, Adv. Func. Mater., 2010, 20, 1568.

“One-Step Catalytic Transformation of Carbohydrates and Cellulosic Biomass to 2,5-Dimethyltetrahydrofuran for Liquid Fuels,” Weiran Yang and Ayusman Sen, ChemSusChem, 2010, 3, 597.

“Synthesis of (N-O)-Ligated Palladium(II) Complexes and Their Use in Ethene Homopolymerization and Norbornene Copolymerizations,” Ying Chen, Sukhendu Mandal, and Ayusman Sen, Organometallics, 2010, 29, 3160.

“Cluster-Assembled Materials: Toward Nanomaterials with Precise Control over Properties,” Meichun Qian, Arthur C. Reber, Angel Ugrinov, Nirmalya K. Chaki, Sukhendu Mandal, Hector M. Saavedra, Shiv N. Khanna, Ayusman Sen, Paul S. Weiss, ACS Nano, 2010, 4, 235.

“Palladium-Catalyzed Nonalternating Copolymerization of Ethene and Carbon Monoxide: Scope and Mechanism,” Rong Luo, David K. Newsham, and Ayusman Sen, Organometallics, 2009, 28, 6994.

Information:

Catalytically-Driven Nanomotors

Nanoscale moving systems are currently the subject of intense interest due in part to their potential applications in nanomachinery, nanoscale assembly, robotics, tribology, fluidics, and chemical/biochemical sensing.  We have demonstrated that one can build nanomotors “from scratch” that mimic biological motors by using catalytic reactions to create forces based on chemical gradients. These motors are autonomous in that they do not require external electric, magnetic, or optical fields as energy sources. Instead, the input energy is supplied locally and chemically. Depending on the shape of the object and the placement of the catalyst, different kinds of motion can be achieved. The resulting nanomotors can, in principle, be tethered or coupled to other objects to act as the “engines” of nanoscale assemblies.  Additionally, an object that moves by generating a continuous surface force in a fluid can, in principle, be used to pump the fluid by the same catalytic mechanism. Thus, by immobilizing these nanomotors, we have developed micro/nanofluidic pumps that transduce energy catalytically.

Polymer Synthesis

One major goal of our ongoing research is the design of metal-catalyzed systems for the homo and copolymerization of functional polar vinyl monomers. Currently, both electron-rich (e. g., vinyl esters and ethers) and electron-deficient (e. g., acrylates, acrylonitrile, vinyl and vinylidene chlorides, and perfluoroalkenes) polar vinyl monomers are commercially produced by free-radical polymerization. As such, there is very little control over tacticity and molecular weight. Clearly, the discovery of general metal-catalyzed pathways for the homo and copolymerization of polar vinyl monomers would constitute a major breakthrough in polymer synthesis.

We have been the first to describe the controlled radical copolymerization of polar vinyl monomers with simple alkenes, fluoroalkenes, and norbornene derivatives. This has led to the synthesis of unique random and block copolymers. Additionally, some of the copolymers of fluoroalkenes with polar vinyl monomers form strong adherent, yet hydrophobic, coatings on a variety of surfaces.

Materials

Bottom-up Assembly of Ordered Metamaterials: In conventional solids nature does not typically allow for much tuning of the bonding and electronic structure. Considerable interest has arisen in ordered arrays of quantum structures, such as quantum dots, that are linked together by molecules that facilitate electronic, magnetic and thermal communication. With such a metamaterial approach there is much more flexibility in designing the electronic structure by varying the linker molecules, the terminating end groups and the semiconductor quantum structures than there is for conventional solids. Our focus is on synthesis of well-ordered and structurally well-characterized 2 and 3-dimensional nanocomposite metamaterials. We have begun with an investigation of the synthesis of smaller, soluble clusters of ordered metamaterials, followed by extension of these studies to extended crystalline arrays.

Novel Antimicrobial Polymers and Composites: Our research involves the design of polymers and polymer/inorganic nanoparticle composites with antimicrobial properties. In our work, we have sought to (a) develop new antimicrobial polymers and composites, (b) understand the structure-property relationships underlying their efficacy, and (c) bind the antimicrobials to surfaces to confer antiseptic properties to latter. Our synthesized materials have potent antibacterial activity towards both gram-positive and gram-negative bacteria. The materials form good coatings on surfaces and kill both airborne and waterborne bacteria. Furthermore, the coated surfaces resist biofilm formation. These materials are potentially useful as antimicrobial coatings in a wide variety of biomedical and general use applications.

Research Interests:

Analytical

Self-powered motors and pumps as sensors

Biological
Environmental

Catalytic Hydrocarbon Conversion and Waste Remediation

Inorganic

Nanocrystals and Solid State Materials

Materials and Nanoscience

Homogeneous and Heterogeneous Catalysis, Polymeric Materials, Nanomotors, Nanofluidics

Organic

Homogeneous Catalysis, Polymeric Materials

Polymer
Biomedical

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