The Department of Chemical and Biomolecular Engineering, one of the oldest programs in the country, is undergoing a phase of expansion to become one of the top chemical engineering research and education departments in the country.
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- Location:
- Columbus, OH, 43210
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Graduate Student Scavenger Hunt-Fall Quarter 2009Created about a week ago
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Events
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- Seminar: Oxidation & Reactivit...
Room 207 Koffolt Labs
Thursday, October 29 at 11:30am - Graduate & Professional School...
French Field House
Wednesday, October 21 at 11:00am - Graduate Program Information S...
Ohio State College of Engineering C...
Saturday, October 17 at 10:00am - Cookout for AIChE and/or Socie...
Koffolt Courtyard
Friday, October 16 at 12:00pm - Dow Chemical Information Session
2015 McPherson
Monday, October 12 at 6:30pm - New Graduate Student Orientation
Koffolt Lab Room 336
Friday, September 18 at 8:30am - Buckeye Reunion Under The Star...
The patio between Hitchcock and Kno...
Friday, September 11 at 5:30pm - Cryo-TEM: An Advanced Tool for...
105 Biomedical Research Tower
Wednesday, August 5 at 1:30pm - State-of-the-Science Electron ...
Koffolt Lab-Room 207
Tuesday, August 4 at 11:00am - Buddie Mullins Seminar-Surface...
McPherson-1015
Monday, July 20 at 11:00am
20 new photos
William G. Lowrie Dept. Of Chemical and Biomolecular Engineering
One Buckeye Win Already Tallied in Michigan this Week! Check out the article on our home page http://www.chbmeng.ohio-state.edu/ and the link below!
http://www.ourmidland.com/articles/2009/
www.chbmeng.ohio-state.edu
On Tuesday, November 10, Mrs. Bonnie Buddendeck and her AP Chemistry and Chemistry classes from Centerville High School in Centerville, Ohio visited the department...
William G. Lowrie Dept. Of Chemical and Biomolecular Engineering
Aravind Asthagiri
Dow Chemical Company Foundation
Assistant Professor
Department of Chemical Engineering
University of Florida
Abstract
Transition metals (TM) serve as catalysts under oxygen-rich conditions in applications such as natural gas combustion, exhaust gas remediation in lean-burn engines, and the selective oxidati...on of organic compounds. Under oxygen-rich conditions the metal surface can undergo several structural changes as it begins to oxidize, which in turn can dramatically modify the reactivity of the catalyst. Despite advances in our understanding of the oxidation of several catalytically important TM surfaces there is still disagreement in the exact surface phase that is associated with enhanced reactivity in systems such as CO oxidation on Pt. Therefore there is a need to better understand (1) the oxidation process and the structure of the oxygen phases that develop under various conditions (temperature, partial pressures) and (2) the resulting modifications in reactivity of the catalyst.
In this talk, I will first discuss work in our group examining the initial atomic-level steps in the oxidation of Pt and Pd(111) surfaces using Density Functional Theory (DFT), an accurate first-principles method. We have found a novel mechanism for the initiation of oxidation on Pt(111) that results in strongly buckled 1-D oxide chains on the Pt(111) surface. On Pd(111) this mechanism does not occur but instead subsurface oxygen becomes stable at lower oxygen concentration. I will discuss the differences in Pt and Pd that lead to these differences in oxidation mechanisms. I will also present some preliminary results in understanding the reactivity of CO and NO on the 1-D oxide chains on Pt(111). In the second part of my talk I will present examples from our DFT study of several small molecules (H2O, H2, CO, and CH4) on the major oxide surfaces that form on Pd(111). We have found dramatic differences in reactivity between the 2D oxide phase that initially forms on Pd(111) and the bulk oxide that develops at higher oxygen concentrations. These differences can be attributed to changes in both the geometric and electronic structure of the different oxide surfaces. Our work provides new insight into the kinetics of oxidation of TM surfaces and demonstrates the sensitive link between atomic-level structure of the oxide and the reactivity of the oxide phase.
Enjoy a reception before the seminar: Room 336 Koffolt Labs-11:00 am
Time:11:30AM Thursday, October 29th
Location:Room 207 Koffolt Labs
29 new photos
William G. Lowrie Dept. Of Chemical and Biomolecular Engineering
The American Institute of Chemical Engineers and the Society for Biological Engineers would like to invite you to a cookout with recruiters who are coming to the engineering career expo. The cookout will be Friday, October 16, from 12:00 to 1:30 in the Koffolt courtyard (behind Koffolt on West Woodruff Avenue). This... cookout will be an excellent opportunity to network with recruiters who will be hiring for career and co-op/internship jobs this autumn.
The only requirement to attend is being a member of either organization. To become a member of AIChE, simply send an e-mail to AIChE.OSU@gmail.com expressing your interest. Registering with AIChE nationally is highly encouraged as well. To become an official member, register as a student member for free at aiche.org. Just click on "Join AIChE" on the student tab. We look forward to seeing you there!
Time:12:00PM Friday, October 16th
Location:Koffolt Courtyard
William G. Lowrie Dept. Of Chemical and Biomolecular Engineering Come and learn about career opportunities for PhD Chemists AND Chemical Engineers at Dow Chemical!
Time:6:30PM Monday, October 12th
Location:2015 McPherson
William G. Lowrie Dept. Of Chemical and Biomolecular Engineering
Join us October 17 to learn about graduate school, the various graduate disciplines we offer, how to apply, financial aid opportunities and more! Breakfast and lunch will be served.
Please register online through October 16th at:
http://engineering.osu.edu/events/regist
Open to all!
Time:10:00AM Saturday, October 17th
Location:Ohio State College of Engineering Columbus Campus
William G. Lowrie Dept. Of Chemical and Biomolecular Engineering
Cryogenic-temperature transmission electron microscopy (cryo-TEM) is now accepted as an almost standard tool in the study of complex liquids, i.e., liquid systems with aggregates on the nanometric scale. Methodologies have been developed to help capture the nanostructure of liquid system, while preserving their origin...al state at a given and concentration and temperature. Cryo-TEM is now widely used to study synthetic, biological and medical systems. Originally developed for aqueous systems, it t has been also used very successfully in the study of non-aqueous systems.
Recent developments in high-resolution scanning electron microscopy (HR-SEM) have made it an ideal tool for the study of Nanoparticles and colloids in viscous systems or in systems containing large objects (hundreds of nanometers and larger) in which small (nanometric) features are to be imaged. Improved field-emission electron guns, electron optics and detectors have made it possible to image Nanoparticles down to a few nanometers. Liquid nanostructured systems can now be studied by cryo-SEM, using much improved specimen preparation equipment and cryogenic specimen holders.
In my talk I will describe briefly the latest in these methodologies, and give examples of their application in nano- and biotechnology.
Seminar by Y. (Ishi) Talmon
Time:11:00AM Tuesday, August 4th
Location:Koffolt Lab-Room 207
William G. Lowrie Dept. Of Chemical and Biomolecular Engineering
Cryogenic-temperature transmission electron microscopy (cryo-TEM), namely TEM imaging of liquids ultrafast cooled to cryogenic temperatures has become an indispensable tool to acquire high-resolution direct-images of self-aggregating liquids, containing features on the nanoscopic scale. The methodology that has been de...veloped over the years allows us to capture the nanostructure in its native state of fixed concentration and temperature. A wide range of systems of low- and high-molecular weight solutes, synthetic and biological, has been studied by the technique. While most cryo-TEM work has been done on aqueous systems, more recently the technique has been extended to non-aqueous solvents as well.
The term ‘cryo-TEM’ actually refers to two techniques: direct-imaging cryo-TEM, by which a thin vitrified sample is examined by the TEM at cryogenic temperatures, and freeze-fracture-replication cryo-TEM (FFR), by which a carbon-metal replica of the fractured fast-cooled specimen is examined at room temperature by the TEM. The two techniques are complementary, as I will demonstrate in my talk.
In my presentation I will describe the methodology, and a number of examples that demonstrate the strength and potential applications of the technique.
Seminar by Y. (Ishi) Talmon
Time:1:30PM Wednesday, August 5th
Location:105 Biomedical Research Tower
William G. Lowrie Dept. Of Chemical and Biomolecular Engineering A departmental orientation for all new graduate students has been scheduled for Friday, September 18, 2009; beginning at 8:30 a.m. Orientation will cover all you need to know about being a graduate student in The Department of Chemical and Biomolecular Engineering. You will be introduced to our faculty and staff membe...rs, and learn some aspects of campus life, department research, campus facilities, and lots more. So, please plan to arrive early and attend the fun filled day of Department Orientation on September 18th. For your questions about housing, textbooks, parking, social activities, etc. we will set you up with a current graduate student mentor.
Time:8:30AM Friday, September 18th
Location:Koffolt Lab Room 336
