September 2014 - Msepostdoc-list

FW: Seminar Notice: S. Peng PhD Prelim I Exam Sept. 10, 2014
by Stacey, Lisa A 08 Sep '14

08 Sep '14

Please note location in HAMP 2108 MATERIALS SCIENCE AND ENGINEERING SEMINAR MSE PhD Examination Part I Polymer Based Drug Delivery Carriers for Cancer Therapy- Cellulose Nanocrystal as a Potential Candidate by: Shane Xiufeng Peng Co-Advisors: Prof. J. Youngblood and Prof. R. Moon ABSTRACT Most of the traditional cancer chemotherapeutic agents lack good water solubility, potent blood circulation time, and biodistribution specificity. Nanoparticle based drug delivery carriers can overcome these obstacles by taking advantage of the size and surface properties of engineered nanoparticles. Among the different classes of drug delivery carriers, polymer based drug delivery carriers have the most diverse structures and properties. Through structure control and surface functionalization, polymer based drug delivery carriers are designed to have enhanced in-vivo stability, tumor targeting ability, and controlled drug release profile. Emerging new nanomaterials such as carbon nanotube and cellulose nanocrystals have been utilized in various biomedical applications. Cellulose nanocrystals can be chemically modified to become polymer-drug conjugate type drug delivery carriers. They have the potential to create a new class of low-cost and sustainable nanoparticle based cancer therapeutic agent. Date: Wednesday, September 10, 2014 Time: 9:30 AM Place: HAMP 2108 Lisa Stacey Secretary/Development Assistant Purdue University School of Materials Engineering 765/494-4100

1 0

Fwd: MSE Mixer Friday, 9/19/14
by Donna Bystrom 07 Sep '14

07 Sep '14

If you have not already sent your RSVP for "tent event", please do so by Wednesday, September 10th. We need a head count to be sure we have enough food to feed everyone. Thanks----Donna *Hi Everyone:* *You are cordially invited to attend the------** ** **What: MSE Alumni, Faculty, Staff and Student Mixer** ** **When: Friday, September 19, 2014, 5:30PM - 7:00PM** ** **Where: Outside Neil Armstrong Hall of Engineering (look for the tent set up near Neil's statue)** ** **Please_RSVP by September 10th _through the survey link below* *https://purdue.qualtrics.com/SE/?SID=SV_55r7JDPSdg2lU2x or find the link on the MSE web site main page----look to the right, under "News & Events", then scroll down to the announcement and click on the title (MSE Alumni and Current Student Mixer) There will be food for everyone including vegetarian and gluten free. Hope to see you there. *

1 0

Fwd: REMINDER - PPDA Fall Call out
by Donna Bystrom 04 Sep '14

04 Sep '14

1 0

REMINDER: Seminar Notice: S. Leach PhD Final Exam Sept. 4 2014
by Stacey, Lisa A 04 Sep '14

04 Sep '14

MATERIALS SCIENCE AND ENGINEERING SEMINAR MSE PhD Final Examination Size and Texture Effects on Ferroelectrics by: Sarah E. Leach Advisor: Prof. R. E. Garcia ABSTRACT Thin film ferroelectric materials have generated a great deal of interest for use as low-voltage non-volatile memory, sensors, and actuators. The commercial market for non-volatile memory alone is projected to exceed 20 billion dollars in 2014. Ferroelectric materials are characterized by a reorientable spontaneous electric dipole moment, or polarization domain. A detailed understanding of the underlying domain switching processes in a ferroelectric material is of critical importance for the engineering of memories, where the total switching time affects the write/read time of the device, and the polarization values affect the difference between memory states. An imposed temperature or stress field alters the material’s crystallographic symmetry, which controls the electrostrictive, ferroelectric, or piezoelectric behavior. This study presents analytical and numerical theories to describe the polarization hysteresis behavior for three different configurations: regions within grains of a polycrystalline thin film, a single crystal, and individual grains in a polycrystalline thin film. First, the polarization hysteresis behavior for regions within individual PZT (PbTiO3) grains as a function of epitaxial strain and crystallographic orientation is modeled. In agreement with published experimental results, enhanced or inhibited hysteresis behavior is described, depending on proximity to the grain boundaries, the orientation of the grain to adjacent grains, and the orientation of the grain with respect to the geometry of the thin film. Grain boundaries with different misorientation angles create different local strain fields that couple to the local electric field via the piezoelectric effect, and change the switching behavior of adjacent regions. For 100 nm diameter grains, the coercive field required for polarization switching can vary approximately ±10% between a region near a grain boundary and one near the grain center. Secondly, for single-crystal thin-film devices formed into discrete mesas, the film stresses and average remnant polarization are shown to be controlled by the aspect ratio of the mesa. Calculations demonstrate that the stresses at the edges are relaxed for film height, hf , to width, w, ratios hf /w ≤ 1 x 10-4. For hf /w ≥ 1 x 10-2, the effective in-plane stress is relaxed throughout the deposited film. Moreover, the effective stresses at the center of the mesa are 15% of the stresses of an infinitely wide film, hf /w → 0. Finally, the overall texture, or orientation distribution, of the grains in a polycrystalline film is shown to influence the polarization hysteresis behavior through coupling of the mechanical and electrical fields. For films with hf /w = 0.0011, the remnant polarization decreases from 0.69 C/m2 to 0.66 C/m2 as the orientation distribution becomes more random. Results show that as hf /w → 1, the average value of remnant polarization decreases to approximately 0.64 C/m2 which means that small devices will have a reduced value of remnant polarization compared with infinitely wide films, but the remnant polarization does not decrease to zero. These modeling results are useful for optimizing the performance of PZT devices, but can also be applied to other ferroelectric materials, including lead-free formulations such as Ba(Zr0.2Ti0.8)O3-(Ba0.7Ca0.3)TiO3. Date: Thursday, September 4, 2014 Time: 1:30 PM Place: ARMS 3115 Lisa Stacey Secretary/Development Assistant Purdue University School of Materials Engineering 765/494-4100

1 0

Tablet found in XRD
by Stacey, Lisa A 04 Sep '14

04 Sep '14

MSE Dept., A tablet was found this morning in XRD near the D8. If you are the owner, you'll need to come to ARMS 2300 to identify and unlock the screen. Please see Donna or I for more information. Thank you, Lisa Stacey Secretary/Development Assistant Purdue University School of Materials Engineering 765/494-4100

1 0

Fwd: Welcome Back BBQ
by Donna Bystrom 03 Sep '14

03 Sep '14

1 0

FW: Welcome Back BBQ
by Stacey, Lisa A 03 Sep '14

03 Sep '14

Hello! To kick off the new semester, MSEGSA will be hosting a BBQ on Tuesday, September 9th at Professor Kvam's house beginning at 5:30pm. Patti Finney will be making her delicious pulled pork once again, so please thank both her and Professor Kvam when you see them! Also, seating is limited so please bring lawn chairs if you have any. What: Welcome Back BBQ Where: Professor Kvam's house - 306 Sylvia St. in West Lafayette When: Tuesday, September 9th at 5:30pm Have a great day! Thanks, Kara Luitjohan

1 0