Articles by Jeffrey A. Lawrence in JoVE
Standardized Method for Measuring Collection Efficiency from Wipe-sampling of Trace Explosives Jennifer R. Verkouteren1, Jeffrey A. Lawrence1, Matthew E. Staymates1, Edward Sisco1 1Materials Measurement Science Division, National Institute of Standards and Technology Optimized sampling protocols and the development of new wipe materials can be facilitated by standardized measurements of collection efficiency from wipe-sampling. Our approach for sampling trace explosives uses an automated device to control speed, force, and distance during wipe-sampling followed by extraction of collected explosives.
Other articles by Jeffrey A. Lawrence on PubMed
High-fidelity Chemical Patterning on Oxide-free Germanium Journal of Physics. Condensed Matter : an Institute of Physics Journal. Apr, 2012 | Pubmed ID: 22466616 Oxide-free germanium can be chemically patterned directly with self-assembled monolayers of n-alkanethiols via submerged microcontact printing. Native germanium dioxide is water soluble; immersion activates the germanium surface for self-assembly by stripping the oxide. Water additionally provides an effective diffusion barrier that prevents undesired ink transport. Patterns are stable with respect to molecular exchange by carboxyl-functionalized thiols.