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Thermally programmable pH buffers

ACS Applied Materials and Interfaces

Van Gough, Dara; Bunker, B.C.; Roberts, Mark E.; Huber, Dale L.; Zarick, Holly F.; Austin, Mariah J.; Wheeler, Jill S.; Moore, Diana; Spoerke, Erik D.

Many reactions in both chemistry and biology rely on the ability to precisely control and fix the solution concentrations of either protons or hydroxide ions. In this report, we describe the behavior of thermally programmable pH buffer systems based on the copolymerization of varying amounts of acrylic acid (AA) groups into N-isopropylacrylamide polymers. Because the copolymers undergo phase transitions upon heating and cooling, the local environment around the AA groups can be reversibly switched between hydrophobic and hydrophilic states affecting the ionization behavior of the acids. Results show that moderate temperature variations can be used to change the solution pH by two units. However, results also indicate that the nature of the transition and its impact on the pH values are highly dependent on the AA content and the degree of neutralization. © 2012 American Chemical Society.

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TYPE Conference YEAR 2012
ScopusOSTI

Aqueous synthesis and electrical properties of nano-crystalline PLZT capacitors

DiAntonio, Christopher D.; Monson, Todd M.; Chavez, Tom C.; Stevens, Tyler E.; Roesler, Alexander R.; Huber, Dale L.

Devices with nano-crystalline microstructures have been shown to possess improved electrical properties. Further advantages include lower processing temperatures; however, device fabrication from nano-particles poses several challenges. This presentation describes a novel aqueous synthesis technique to produce large batch sizes with minimal waste. The precipitate is readily converted at less than 550 C to a phase pure, nano-crystalline Pb{sub 0.88} La{sub 0.12}(Zr{sub 0.70} Ti{sub 0.30}){sub 0.97} O{sub 3} powder. Complications and solutions to sample fabrication from nano-powders are discussed, including the use of glass sintering aids to improve density and further lower sintering temperatures. Finally, electrical properties are presented to demonstrate the potential benefits of nano-crystalline capacitors.

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TYPE Conference YEAR 2010
OSTI
Results 76–100 of 126
Results 76–100 of 126