Molecular motor powered by the
hydrolysis of ATP to translate DNA. The motor, one of the strongest
molecular motors reported, appears to be novel mechanistically in
comparison to the two known rotary motors, flagella and F1-ATPase.
The structural components of the motor and their concerted function
are being dissected by integrated genetic, biochemical and biophysical
Synthesis, physical characterization, physical
properties and modeling of block copolymers and block copolymer based
blends. Characterization tools include small-angle x-ray and
neutron scattering, dynamic mechanical spectroscopy, electron and
optical microscopy, rheology, large strain mechanical testing, transport
(ionic, diffusion) measurements, and processing techniques.
Development of chemically selective
scanning tunneling microscopy (STM) as a new characterization tool
for nanosciences. Chemically selective imaging of individual molecules
by use of chemically modified STM tips. Chemistry of carbon nanotubes
and their application as STM tips. Characterization of self-assembled
monolayers at the molecular level.
Obtaining direct write electron beam lithography
system as a general usage tool for the microtechnology lab. Sytem
will be online in late 2001. Nanoparticle research: heterogeneous
systems by electrostatic localization of 5 to 50 nm inorganic structures
on predefined sites; nonvoilatile memories built by by embedding particles
in insulatoring films.
Characterization of structure
and defects at the nonoscale. Materials systems include metals, semiconductors,
ceramics and copmposites. All aspects of TEM, SEM and AFM. Thin films,
particulates, growth and properties.
Electronic, optical, and surface properties of
molecular materials on sub-micron length scales. We emphasize molecular
materials that have current or potential applications in electronics,
and rely heavily on nanofabrication techniques and scanning probe
microscopies to correlate properties of these materials with their
Plasma synthesis of nanoparticles. Plasma deposition
of superhard nanostructured films for friction and wear resistance.
Synthesis of amorphous silicon films with nanocrystalline inclusions,
for photovoltaic applications. Energetic properties of nanoparticles
for applications such as solid fuel propulsion. Gas-phase nucleation
of nanoparticles during semiconductor processing.
Physics of mesoscopic solids, electronic properties,
correlated electron tunneling, transport of interacting electrons,
ballistic conduction, collective excitations, quantum fluctuations.
Superconductivity: properties of layered and high-Tc materials, quantum
and thermal fluctuations in samples of reduced dimensionality and
Scanning Probe Lithography and Electric Microcontact Printing to pattern
charge, oxides, and resists with sub 100 nm resolution. 2. Self-Assembly
Based Manufacturing: The use of electrostatic forces to pattern nanoparticles
with sub 100 nm resolution (NanoXerography).
Nanoscale electronic device, circuit, and fabrication
technologies. Electronic logic, memories and sensors based on Coulomb
blockade. Molecular-based electronic logic and memory devices. Circuit
architectures for nanoscale electronics. Self-assembly of circuitry
by controlled precipitation in solids. Programmed assembly of electronic
circuits by DNA scaffolding. Electric-field driven assembly and manipulation
Primary research interests are
in nonequilibrium plasmas processes for advanced technological applications
as well as nanoparticle formation in plasmas. Formation and growth
of nanoparticles in low pressure plasmas, depositions of nanostructured
thin films, electron kinetics in low pressure plasmas, and stability
of atmospheric pressure glow plasmas.
Magnetic heterostructures and nanostructures. Thin
film multilayers and superlattices. Interface magnetism and magnetic
coupling phenomena. Large area magnetic nanodots fabricated by biological
templating. Reversal mechanisms and coercivity in dot arrays.
Measurement of micro/nano scale
mechanical properties of soft tissues using nanoindentation and microscratch
techniques. Measuring fracture toughness and stiffness of cartilage
in the mouse and other small animal models of cartilage disease and
injury. These properties are related to microstructural composition
and organization of the cartilage.
Jack L Dept. of Orthopaedic Surgery and
Block copolymer nanostructures. Polymer synthesis
and characterization. Diffusion, rheology, dynamics.
Two-dimensional DNA crystals
as a scaffolding for the self-assembly of arrays of metallic nanoparticles
for the development of new electronic devices. Experiments involve
(1) optimization of conjugation strategies for attachment of gold
nanoparticles to DNA hairpin oligonucleotides, (2) assembly into two-dimensional
DNA crystals, (3) analysis by scanning probe and electron beam microscopies.
Nanoparticle production and measurement, microcontamination
research, filtration and separation technology, aerosol instrumentation,
as well as aerosol charging, sampling, transport, and deposition mechanisms.
Surface chemistry of size-selected
nano-aerosol particles. Atmospheric processing involving nano-sized
cloud particles. Spectroscopy at nanoparticle surfaces. Molecular
origin of nano-, meso-, and microstructure in chemical vapor deposition.
Chemical routes to new, high technology materials.
Modeling of complex fluids by particle simulations.
Retention in chromatographic systems. Phase equilibria and thermophysical
properties. Structure of microheterogeneous fluids (e.g., nanoemulsions).
Nucleation of chain and/or associating fluids. Polymorphism and solvate
Interaction of biological molecules
with manmade nanometer-scale patterns and objects. Biomolecule templating
of nanoparticle shape and size; novel biosensor technologies from
nanoparticle probes; understanding protein-protein, protein-ligand
and protein-surface interactions over 10-500 nm lengthscales using
nanolithographically patterned models.
Studies on the microbial transformation
of biologically-rare elements: silicon, tin, germanium, boron, and
bismuth. These investigations contribute to the microbial genomics
effort and potentially new biochemical knowledge to be used in microbially-based
Nanoparticle synthesis from the
gas phase. Mass-spectrometric characterization and laser induced breakdown
spectroscopy. Atomistic simulation of nanoparticle properties. New
CVD methods for synthesis of nanocrystalline films.