Research Group 4
CREST student wins prestigious national award PDF Print E-mail
Written by Marcelo Suarez   
Wednesday, 17 November 2010 01:16

On November 8th, Sonia L. Aviles-Barreto won second place in the Poster Competition of the Materials Science and Engineering Division (MESD) of the 2010 Annual Meeting of the American Institute of Chemical Engineers (AIChE) in Salt Lake City, Utah. Sonia is a member of CREST IRG4 completing her Ph.D. at the Department of Chemical Engineering under the supervision of Dr. David Suleiman. The overall goal of the research is to develop new low-cost, durable proton exchange membranes (PEM) with higher selectivity and proton conductivities to develop and enhance the performance of energy efficient devices as fuel cells and hydrogen gas sensors. Their specific objective is to be able to functionalize ionomers with sulfonic groups, cation substitution and additives to produce selective membranes for these applications.

 

Sonia Aviles AIChe 2010, poster: Effect of Sulfonation Level and Counter Ion Substitution on the Proton Conductivity of Poly(styrene-isobutylene-styrene) Membranes
Last Updated on Sunday, 25 September 2011 13:56
 
NSF CAREER Award to support CREST research PDF Print E-mail
Monday, 09 August 2010 13:03

Our group recently discovered that VO2 coated silicon cantilevers show an abrupt and large bending during the VO2’s insulator-to-metal transition (IMT). This CAREER award will use this discovery for the development of a new technology in infra-red (IR) sensing. This new technology for IR sensing offers resolutions and sensitivities unachievable at the current state-of-the-art.


The advances that will derive from these developed technologies are unprecedented and hard to overestimate, since they are expected to find use in a broad spectrum of applications. One example of these applications is on the development of VO2-based tunable resonators, which is one of the research goals of IRG4 of the CREST center at UPRM. In addition to the large bending observed on the VO2-coated cantilevers, we have observed a large shift in the resonant frequency of VO2-coated bridges of ~ 20%; which is caused by the large compressive stress that these structure experiences during the same region -these resonant frequency changes are not observed on cantilever structures-. Furthermore, this tuning range has been observed in non-optimized devices. Current state-of-the-art technologies in tunable MEMS resonators show a frequency tuning range smaller than 10%, and their operation principle (applied dc-bias) has many limitations in terms of insertion losses and matching impedance.


The proposed technology, which is based on phase-transition materials, will overcome these problems and offer far superior performance with a much simpler design, fabrication and testing process.

Last Updated on Monday, 09 August 2010 13:17
 
CREST Researcher selected to receive NSF CAREER PDF Print E-mail
Written by Jaquelina Alvarez   
Monday, 09 August 2010 12:22

Dr. Nelson Sepúlveda <!--[endif]-->

Dr. Nelson Sepúlveda, has received a Faculty Early Career Development Award (CAREER) from the National Science Foundation (NSF), which is NFS’s most prestigious awards in support of junior faculty who exemplify the role of teacher-scholars through outstanding research, excellent education and the integration of education and research within the context of the mission of their institution.

Dr. Sepulveda will use the five-year, $400,000 award to further his research into Vanadium Dioxide-based Focal Planar Arrays.

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Last Updated on Friday, 03 September 2010 21:10
 
IRG4: Nanoengineered Composites for Energy-Efficient Devices and Applications PDF Print E-mail
Written by Administrator   
Friday, 06 October 2006 19:29

O. Marcelo Suárez (PI), Nelson Sepúlveda, Agnes Padovani, David Suleiman, Guillermo Serrano and Paul Kohl

This IRG will focus on the engineering principles and fundamental science involved in the development of nanomaterials for energy-efficient devices and applications, including research on the functionalization and application-oriented characterization of various types of materials whose macroscale properties and applications depend on an intrinsic nanoscale structure. The program combines the following research areas: metal-based nanocomposites, polymer-based nanocomposites, and materials characterization and processing for device development.

Last Updated on Sunday, 16 November 2008 18:33
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NCBEDSA is a National Science Foundation (NSF) Center for Research Excellence in Science and Technology (CREST) at the University of Puerto Rico at Mayagüez
University of Puerto Rico-Mayagüez