Open Access. Powered by Scholars. Published by Universities.®

Nanoscience and Nanotechnology Commons

Open Access. Powered by Scholars. Published by Universities.®

Articles 1 - 4 of 4

Full-Text Articles in Nanoscience and Nanotechnology

Breast On-A-Chip: Mimicry Of The Channeling System Of The Breast For Development Of Theranostics, Meggie Grafton, Lei Wang, Pierre-Alexandre Vidi, James Leary, Sophie Lelievre Dec 2012

Breast On-A-Chip: Mimicry Of The Channeling System Of The Breast For Development Of Theranostics, Meggie Grafton, Lei Wang, Pierre-Alexandre Vidi, James Leary, Sophie Lelievre

Dr Lei Wang

Improved detection and therapy of breast neoplasia might benefit from nanodevices traveling inside mammary ducts. However, the decreasing size of branched mammary ducts prevents access to remote areas of the ductal system using a pressure-driven fluid-based approach. Magnetic field guidance of superparamagnetic submicron particles (SMPs) in a stationary fluid might provide a possible alternative but it is critical to first reproduce the breast ductal system to assess the use of such devices for future therapeutic & diagnostic ("theranostic'') purposes. Here we describe the engineering of a portion of a breast ductal system using polydimethylsiloxane (PDMS) microfluidic channels with a total volume ...


Possible Room-Temperature Ferromagnetism In Hydrogenated Carbon Nanotubes, Adam Friedman, Hyunkyung Chun, Yung Joon Jung, Don Heiman, Evan Glaser, Latika Menon Oct 2012

Possible Room-Temperature Ferromagnetism In Hydrogenated Carbon Nanotubes, Adam Friedman, Hyunkyung Chun, Yung Joon Jung, Don Heiman, Evan Glaser, Latika Menon

Latika Menon

We find that ferromagnetism can be induced in carbon nanotubes (CNTs) by introducing hydrogen. Multiwalled CNTs grown inside porous alumina templates contain a large density of defects resulting in significant hydrogen uptake when annealed at high temperatures. This hydrogen incorporation produces H-complex and adatom magnetism which generates a sizable ferromagnetic moment and a Curie temperature near TC=1000  K. We studied the conditions for the incorporation of hydrogen, the temperature-dependent magnetic behavior, and the dependence of the ferromagnetism on the size of the nanotubes.


Assembly Of Dithiocarbamate-Anchored Monolayers On Gold Surfaces In Aqueous Solutions, Heng Zhu, Donna Coleman, Christopher Dehen, Iris Geisler, Dmitry Zemlyanov, Jean Chmielewski, Garth Simpson, Alexander Wei Mar 2012

Assembly Of Dithiocarbamate-Anchored Monolayers On Gold Surfaces In Aqueous Solutions, Heng Zhu, Donna Coleman, Christopher Dehen, Iris Geisler, Dmitry Zemlyanov, Jean Chmielewski, Garth Simpson, Alexander Wei

Dmitry Yurievich Zemlyanov

Dithiocarbamates (DTCs) can be formed by the in situ condensation of polar alkylamines with CS2, and assembled into dithiocarbamate-anchored monolayers (DAMs) on Au substrates in aqueous solutions. Primary and secondary amines can both be used to prepare DTCs, but have significant differences in their reactivities and product stabilities. Ultraviolet absorption spectroscopy provides a convenient method for monitoring in situ DTC formation as well as the formation of potential byproducts. The kinetics of DAM assembly on An substrates as measured by second harmonic generation (SHG) indicated first-order rate processes and saturation coverages similar to those of alkanethiols on Au. However, the ...


Adsorption Of Amino Acids On Indium Arsenide (100) Surfaces: Assessment Of Passivation Capabilities, John Slavin, Dmitry Zemlyanov, Albena Ivanisevic Mar 2012

Adsorption Of Amino Acids On Indium Arsenide (100) Surfaces: Assessment Of Passivation Capabilities, John Slavin, Dmitry Zemlyanov, Albena Ivanisevic

Dmitry Yurievich Zemlyanov

Angle-Resolved X-ray Photoelectron Spectroscopy (ARXPS) was used to examine amino acid bonding and oxide removal on InAs(100) surfaces. Five amino acids were studied, including cysteine, lysine, aspartic acid, glutamic acid and arginine. Observations on the ability of specific functional groups to prevent oxide formation were made by examining the thickness of oxide films on the functionalize surfaces. Amino acids that possessed more than one functional group having resonance were shown to most effectively affect oxide formation. The influence of these groups on the electronic structure of InAs(100) provides insight into how multifunctional passivation strategies could be beneficial, as ...