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Direct-write, chemically-prepared temperature insensitive dielectrics

Hernandez-Sanchez, Bernadette A.; Lu, Ping L.; Garino, Terry J.; Sipola, Diana L.; Bell, Nelson S.; Wheeler, Jill S.

Development of high energy density dielectrics with low temperature coefficients of capacitance that are systems integrable are needed for extreme environment, defense and automotive applications. The synthesis of high purity chemically prepared Ca(Zr,Ti)O3 powders is described and has resulted in the lowering of conventional firing temperatures by over 100 C. Direct write aerosol spray deposition techniques have been used to fabricate high quality single layer and multilayer capacitors from these powders. The dielectric constants of the direct write capacitors are equivalent to those of fired bulk ceramics. Our presentation emphasizes the synthesis, phase evolution and microstructure development that has resulted in dielectrics with energy densities in excess of 3 J/cm3 with less than 1% change in dielectric constant over a 200 C temperature range.

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TYPE Conference YEAR 2010
OSTI

CSI: Dognapping workshop : an outreach experiment designed to produce students that are hooked on science

Hernandez-Sanchez, Bernadette A.; Boyle, Timothy J.; Steele, Leigh A.; Lambert, Timothy N.; Pratt, Harry P.

The CSI: Dognapping Workshop is a culmination of the more than 65 Sandian staff and intern volunteers dedication to exciting and encouraging the next generation of scientific leaders. This 2 hour workshop used a 'theatrical play' and 'hands on' activities that was fun, exciting and challenging for 3rd-5th graders while meeting science curriculum standards. In addition, new pedagogical methods were developed in order to introduce nanotechnology to the public. Survey analysis indicated that the workshop had an overall improvement and positive impact on helping the students to understand concepts from materials science and chemistry as well as increased our interaction with the K-5 community. Anecdotal analyses showed that this simple exercise will have far reaching impact with the results necessary to maintain the United States as the scientific leader in the world. This experience led to the initiation of over 100 Official Junior Scientists.

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TYPE SAND Report YEAR 2008
OSTIDOI

Synthesizing biofunctionalized nanoparticles to image cell signaling pathways

IEEE Transactions on Nanobioscience

Hernandez-Sanchez, Bernadette A.; Boyle, Timothy J.; Lambert, Timothy N.; Daniel-Taylor, Sherrika D.; Oliver, Janet M.; Wilson, Bridget S.; Lidke, Diane S.; Andrews, Nicholas L.

This minireview outlines the synthetic efforts, from our research group, to produce nanomaterials for use as imaging agents to study cell signaling pathways. An overview of our approach to the synthesis and biofunctionalization of metal, semiconductor, and ceramic nanomaterials is presented. The probes investigated include coinage metals, Cd-based, Geo, naturally occurring fluorescent (NOF) minerals, and Ln-based nanoparticles which were synthesized from novel metal alkoxide, amide, and alkyl precursors. We illustrate the applications of some of these materials as imaging probes to detect signaling pathway components and cellular responses to signals (apoptosis and degranulation) in inflammatory and cancer cells. © 2006 IEEE.

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TYPE Journal Article YEAR 2006
ScopusOSTI
Results 101–117 of 117
Results 101–117 of 117