 |
Sheryl
H. Ehrman 1223C Building 090 (office) 2113 Building 090 (mailing address) Department of Chemical and Biomolecular Engineering University of Maryland College Park, MD 20742 Ph:
(301) 405-1917 |
Chemical
Engineering Faculty
|
Background Information
| PhD 1997 Chemical Engineering, University of California, Los
Angeles |
| BS 1991 Chemical Engineering, University of California, Santa
Barbara |
Appointments |
| 2006-2007 Visiting Associate Professor, Chemical Engineering, Indian Institute of Technology, Bombay, Mumbai, India |
| 2004-present Associate Professor, Chemical and Biomolecular Engineering, University of Maryland |
| 2003-present Participating Faculty, Bioengineering Program |
| 2000-present Participating Faculty, Chemical Physics Program |
| 1998-2004 Assistant Professor, Chemical Engineering, University of Maryland |
| 1997-8 NSF International Research Fellow, Paul Scherrer Institute, Villigen, Switzerland |
| 1997 Guest Scientist, National Institute of Standards and Technology, Gaithersburg, MD |
| Keystone: The Clark School Academy of Distinguished
Professors, 2007 |
| A. James Clark School of Engineering, University of Maryland, E. Robert Kent Outstanding Teaching Award for Junior Faculty, 2006 |
| Fulbright Research Fellowship, Indian Institute of Technology, Bombay, Mumbai, India, 2006-2007 |
| National Science Foundation (NSF) CAREER award, 2001 |
| Ralph E. Powe Junior Faculty Enhancement Award, Oak Ridge Associated Universities, 1999 |
| National Science Foundation (NSF) International Research Fellow, 1997-1998 |
Research
Interests
Some of the most
exciting
advances in science are occurring at the smallest length scales.
My current research interests concern fine particles (micron or
less).
The field of fine particle research can be roughly subdivided into the
wet and the dry, and the good and the bad. Wet or dry describes
how
the particles are formed, either in solution or by gas-to-particle
conversion,
respectively. “Good” particles are those which are desired
products,
with applications including materials manufacturing and aerosol drug
delivery.
The “bad” particles are formed as unwanted byproducts of processes such
as incineration, combustion of diesel fuel, or in semiconductor
processing
equipment.
Synthesis,
Characterization and Applications of Nanoscale Materials
Recent advances in
high temperature aerosol synthesis have resulted in the production of
many
new materials with applications in areas including biotechnology,
electrical and optical devices, and energy utilization. For many
of these
materials, particle size and morphology have significant effects on the
material property of interest. Current research is focused on
developing
a fundamental understanding of the relationships between process
conditions,
nanoparticle structure, and the material properties of nanoparticles,
which
may differ significantly from those of bulk materials. This
understanding
is applied towards developing processes for making materials with
optimal properties, as well as towards controlling the formation of
unwanted particulate contamination.
Chemical
Characterization of Ambient Aerosol
New regulations
controlling
emissions of fine particulate matter (diameter less than 2.5 microns)
have
served to focus attention on these alleged “killer particles”.
This
standard was developed in response to many epidemiological studies, the
results of which suggest that there is a link between high
concentrations
of fine particulate matter and increased mortality. The nature of
this link is not well understood, however. Efforts in this area
are
concerned with understanding the formation behavior of high-surface
area
particulate in high temperature processes, and in developing new
electron
microscopy techniques for chemical characterization of ambient
particulate
matter.
For more information about our research, please see our group web page.
Selected Publications
Kim S. and Ehrman S.H. “Capillary condensation onto titania (TiO2) nanoparticle agglomerates,” Langmuir, 23, 2497-2504 (2007).
Huang K.C. and Ehrman S.H.” Synthesis of Iron Nanoparticles via
Chemical Reduction with Palladium Ion Seeds,” Langmuir, 23, 1419-1426 (2007).
Williams, D.N., Ehrman S.H., Pulliam Holoman, T.R., “Evaluation of
microbial cellular response to inorganic nanoparticles”, Journal of
Nanobiotechnology, 4:3
doi: 10.1186/1477-3155-4-3 (2006).
Nguyen, Q.T., Kidder J.N. Jr., and Ehrman S.H., “Hybrid Gas-to-Particle Conversion and Chemical Vapor Deposition for the Production of Porous Alumina Films,” Thin Solid Films, 410, 42-52 (2002).
Singh Y., Javier J.R.N., Ehrman S.H., Deppert K., and
Magnusson M.,
"Approaches to Increasing Yield in
Evaporation/Condensation
Nanoparticle Generation,“ Journal of
Aerosol Science, 33,
1309-1325
(2002).
Teaching
Interests
Courses Taught:
ENCH 400 Chemical Engineering
Thermodynamics
ENCH 437 Chemical Engineering
Laboratory
ENCH 471 Introduction
to
Particle Technology
ENCH 648I Advances in
Particle Technology
ENCH 630 Advanced Transport Phenomena
ENES 100 Introduction to Engineering
Design