IPRIME presents a web series designed to inform our company members on a wide range of recent scientific and technological research developments. IPrime faculty from seven programs will discuss important insights to current research areas of industry interest. Webcasts are prerecorded.
To view a webcast
Available to IPRIME members only. To access, click “watch” and enter your company’s IPRIME ID and password for the series login.
September 25, 2012
Watch: Transferring Liquid from One Surface to Another: The Interfacial Engineering of Printing Processes
Professor Satish Kumar, Chemical Engineering and Materials Science
Coatings Process Fundamentals program co-leader
High-speed printing processes are a leading technology for the large-scale manufacture of a new generation of nanoscale and microscale devices. Central to all printing processes is the transfer of liquid from one surface to another, a seemingly simple unit operation that is still not well-understood. We will discuss how theory and experiment can be successfully employed to shed light on the mechanics of liquid transfer. The insights gained suggest strategies for engineering the interfacial behavior that lies at the heart of the liquid transfer operation.
October 29, 2012
Watch: New AFM Methods for Biomedical Coating Characterization: Fast Force-Curve Mapping
Drs. Greg Haugstad and Jake Warner, Characterization Facility
Nanostructural Materials and Processes program
In this webinar we introduce some newer and elucidating modalities in atomic force microscopy (AFM). The base method creates images via the distance dependence of tip-sample interaction, but does not resonantly excite the AFM tip/cantilever (unlike conventional “tapping mode”). Thus complex dynamic states are avoided and quasistatic tip-sample interaction force is measureable. The usual topographic imaging is enabled at a controlled maximum applied force per nanoscale touch, while property-sensitive images are simultaneously acquired. These latter images derive from the stiffness of tip-sample contact as well as the strength of interaction between tip and sample. Hysteretic/dissipative interactions can provide further contrast mechanisms. Thus (visco-) elastic and chemical contrast is better identified and separated than in traditional “tapping mode” and
its ancillary “phase imaging”.
We will perform live demonstrations of one variant of this new method, which goes by the trade name PeakForce Tapping/QNM (quantitative nano-mechanics). We investigate two complex soft-material systems from IPRIME collaborative research: the distribution of drug particles and silica in PDMS matrices, and a cross-sectional interface
between an angioplasty balloon and its polymeric coating. At the end of the prerecorded webinar, we will provide the viewers with a means to email in questions that will we individually address at a later time.
November 27, 2012
Watch: Anti-Contamination Coatings using Interface Active Enzymes
Professor Ping Wang, Bioproducts and Biosystems Engineering
Biocatalysis and Biotechnology program
Functional materials have been traditionally developed by constituting certain physical properties, such as hydrophobicity, for desired functionalities. Recent advances have shown an increasing interest in smart materials that are responsive to structural or environmental changes to initiate desired activities such as self-healing and self-cleaning. Our work is aimed at bioactive materials that can reactively prevent surface contamination in situ with high selectivity. We approach this by mimicking naturally occurring self-defense processes that rely on releasing peptides or enzymes to approaching contaminating biological matters as their first-time response. The results promise the design of a new array of smart organic materials possessing tunable and highly selective functionalities such as anti-microbial, self-reporting, self-sensing and self-healing, in addition to self-cleaning.
December 17, 2012
Watch: Plasma Synthesis, Surface Functionalization, and Applications of Silicon Nanocrystals
Professor and Head Uwe Kortshagen, Mechanical Engineering
Renewable Energy Materials program co-leader
Nonthermal plasmas present an ideal medium for the synthesis of covalently bonded semiconductor nanocrystals as these require relatively high synthesis temperatures. In the low pressure plasma environment, such high temperatures result from the combination of energetic surface reactions heating the nanoparticles and their slow convective cooling. Simultaneously, nanoparticles carry a unipolar negative charge which reduces particle agglomeration and diffusion loss to the reactor walls. This talk will describe the synthesis, functionalization, and device integration of silicon nanocrystals synthesized with nonthermal plasmas. The talk will discuss applications of silicon nanocrystal films in photovoltaic and light emitting devices.
This work was supported by the National Science Foundation under MRSEC award number DMR-0819885.
February 21, 2013
Watch: Engineering Exciton Formation and High Efficiency in Graded-Emissive Layer Organic Light-Emitting Devices
Professor Russ Holmes, Chemical Engineering and Materials Science
Organic Optoelectronic Interfaces program
Organic light-emitting devices (OLEDs) continue to receive significant attention for application in both displays and solid-state lighting sources. These devices are attractive for their compatibility with low-cost processing techniques and also exhibit exceptionally high electroluminescence efficiencies. Frequently, high efficiency is realized through the use of complex, multilayered device architectures. In this work, the focus is instead on realizing high efficiency in OLEDs comprising only a single active-layer whose composition is spatially engineered to realize effective charge and exciton confinement. In a graded-emissive layer (G-EML) OLED, the composition consists of nearly 100% hole-transporting material (HTM) at the anode and nearly 100% electron-transport material (ETM) at the cathode, with a continuously varying HTM:ETM composition across the active layer. Electroluminescence comes from a phosphorescent guest that is uniformly doped throughout the G-EML. In this work we demonstrate red-, green-, and blue-emitting G-EML OLEDs which show high efficiency comparable to more complex, multilayered structures. We also demonstrate how this structure leads to the natural confinement of both charge carriers and excitons, without the need for any additional blocking layers. Separate measurements of the exciton recombination zone indicate that the G-EML is characterized by a broad recombination zone in comparison to conventional heterostructure OLEDs. We will discuss the potential implication of the broad exciton recombination zone in the context of device efficiency, lifetime and eventual application.
March 20, 2013
Watch: Cardiovascular Tissue Engineering: Applying advances in stem cell biology and tissue engineering to develop engineered arteries, heart valves, and cardiac patches
Professor and Head Bob Tranquillo, Biomedical Engineering
Biomaterials and Pharmaceutical Materials program
Updating on the latest developments in cardiovascular tissue engineering and related stem cell technologies; Evaluating the benefits and limitations of engineered cardiovascular tissues to understand the implications for clinical therapy; Envisioning the application of cardiovascular regeneration to develop therapies for heart failure and tissue repair; Exploring the significance of cardiovascular regeneration in determining the biocompatibility of materials and future form and function of cardiovascular devices.
May 21, 2013
Watch: Theory and Simulations of Block Copolymer Liquids: Correlations and Corresponding States
Professor David Morse, Chemical Engineering and Materials Science
Microstructured Polymers program
Block copolymers can self-assemble into a wide variety of ordered structures. The primary tools for analyzing experiments on these systems has, for the last three decades, been based on comparison of experimental results to predictions of the so-called self-consistent field theory (SCFT). SCFT is generalization of the Flory-Huggins theory of polymer blends that is generalized so as to describe inhomogeneous structures by treating each polymer within the material as a random walk in an inhomogeneous chemical potential landscape. Recent advances in theory and in the analysis of coarse-grained simulations provide increasingly strong evidence for the existence of a universal equation of state that approaches that predicted by SCFT in the (hypothetical) limit of infinitely long chains, but that allow a much more consistent description of results of simulations carried out with experimentally relevant finite chain lengths.