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[Sandia Lab News]

Vol. 55, Special Issue        February 2003
[Sandia National Laboratories]

Albuquerque, New Mexico 87185-0165    ||   Livermore, California 94550-0969
Tonopah, Nevada; Nevada Test Site; Amarillo, Texas

Back to Lab News Sandia Labs Accomplishments 2003 index

Materials, physics, and chemistry

Removable materials, (thermoset resins that can be "uncrosslinked," allowing rework of electronic parts) are being implemented as the base-line encapsulant materials (both foams and coatings) in the W76-1 AF&F refurbishment. These new materials are based upon a thermally reversible chemistry that has been explored over the past five years that allows for encapsulant removal at an elevated temperature -- above the STS temperature but below any component degradation temperatures. The resin synthesis, material formulation, and processing is being done in conjunction with Honeywell FM and T KCP. (1800, 1700, 6200, 8700) Jim Aubert, jhauber@sandia.gov

We have developed a hyperspectral imaging system for scanning DNA microarrays. Acquisition of the entire emission spectrum at each array location gives this instrument significant advantages over commercial scanners. Coupling the hyperspectral imager with multivariate data analysis provides an even greater advantage through quantitative modeling of all emission sources at each pixel. In collaboration with UNM researchers, we have demonstrated that this approach provides a more accurate estimation of the concentrations of fluorescent species and increases the reliability of gene expression data. (1800, 5700, 9200) Mike Sinclair, mbsincl@sandia.gov

We have developed a miniaturized protein concentrator capable of 1000-fold concentration of proteins and other biomolecules. The concentrator is voltage-addressable and provides a simple means of concentrating proteins such as biotoxins to allow detection of previously undetectable amounts. It is based on a recent discovery of trapping of proteins in nanoporous beds under an applied electric field. The concentrator can easily be integrated into a miniaturized analysis system and is being developed as a component of MicroProLab module under the Molecular Integrated Microsystems project. (8100) Anup Singh, aksingh@sandia.gov

We have developed a microfluidic device with an active self-assembled monolayer coating that can absorb proteins from solution, hold them with negligible denaturation, and release them on command. The success grew from studies on the use of tethered organic coatings to reversibly switch the surface chemistry of components in microanalytical systems. This device can form the basis for microfluidic systems with proteomic analysis functions and for compact, rapid, highly selective, reusable biosensors capable of detecting multiple agents. (1100, 1700, 1800) Paul Dressendorfer, dressepv@sandia.gov

Aging of weapons components is governed by chemical reaction rates determined by activation energies. Because rates depend exponentially on activation energies, small errors in calculated energy barriers can give orders-of-magnitude errors in rates. Modern first-principles techniques and increases in computing power now permit unprecedented accuracy in calculating these barriers. A stunning example is carbon impurity diffusion through a grain boundary commonly found in nickel LIGA materials. This is the first simulation of such a complex system, taking two weeks on C-plant, equivalent to five years of CPU time. (8700) Bob Hwang, rqhwang@sandia.gov

A Sandia-developed Gunshot Residue Test Kit has been licensed to Law Enforcement Technologies and is now helping to solve real crimes throughout the country. Each kit includes a round fiberglass swab that is rubbed on hands, arms, clothing, or vehicles belonging to someone suspected of firing a gun. The blue specks that appear on the swab seconds after adding a proprietary chemical provide important forensic information that helps law enforcement officials quickly solve the most difficult cases and jail the culprits. (2500, 1300) Pam Walker, pkwalke@sandia.gov

Friction and wear are major concerns in the performance and reliability of micromechanical (MEMS) devices. While many tribological coating materials are available, it is difficult to apply uniform coatings to the intricate three-dimensional structures typical of MEMS devices. We have developed a novel coating process called atomic layer deposition (ALD), which uniformly coats shadowed surfaces such as gear hubs and teeth with wear-resistant or lubricating films. Many different types of hard or lubricating materials are possible by ALD, as well as alloys and nanolaminates with enhanced mechanical and tribological properties. (14100, 1800, 1100) Thomas Mayer, 844-0770, 14171, tmmayer@sandia.gov

Last modified: March 14 , 2003


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