Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session E01: Polymer Physics Prize Symposium 2021Invited Live Prize/Award
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Sponsoring Units: DPOLY Chair: Shaoyi Jiang, Cornell University |
Tuesday, March 16, 2021 8:00AM - 8:36AM Live |
E01.00001: Magneto-optical Materials and Polymers: Determining Structure Property Relationships Invited Speaker: Timothy Swager An emerging application of high polarizability polymers and extended π-conjugated systems is the detection of magnetic fields using the Faraday Effect. New materials with improved performance can be used to measure trace magnetic fields using an optical based sensor. In pursuit of new high-performance materials, we have been engaged in a program measuring the Faraday rotations of both molecular and polymeric systems. The ultimate designs are still elusive, however I will present studies guided by general considerations. These include the ability to create non-birefringent films (at least along the direction of light propagation), with degenerate or near degenerate electronic transitions, and a perpendicular orientation of the electronic and magnetic transition dipoles/moments. Chirality plays a role in these processes and our investigations of chiral (helical) polymers will be detailed. |
Tuesday, March 16, 2021 8:36AM - 9:12AM Live |
E01.00002: High-Efficiency Organic Solar Cells Based on Polymer Donors: The Impact of Non-Fullerene Acceptors Invited Speaker: Jean-Luc Bredas With the emergence of efficient non-fullerene acceptors some five years ago, the power conversion efficiency of organic solar cells (OSCs) has increased remarkably, from some 12% to over 18%. In OSCs, the active layers consist of bulk-heterojunctions, that is blends of an electron donor component, usually a π-conjugated polymer, and an electron acceptor component. The inter-molecular charge-transfer (CT) electronic states that appear at the donor-acceptor interfaces play a crucial role in the exciton-dissociation, charge-separation, and charge-recombination processes [1]. |
Tuesday, March 16, 2021 9:12AM - 9:48AM Live |
E01.00003: Polymer Physics Prize (2021): Polymer-Based Photovoltaics Invited Speaker: Samson Jenekhe The journey from fullerene-based to non-fullerene acceptor (NFA)-based polymer solar cells has been long, challenging and rewarding for the field of organic photovoltaics (OPVs). Advances in NFA materials, donor polymers and blend devices have pushed the OPV device efficiency above 18 %. I will discuss select examples of our work in this area, including: (i) blends of a small-molecule non-fullerene acceptor (NFA) with a donor polymer; and (ii) all-polymer solar cells (all-PSCs) composed of both donor and acceptor polymers. We have found that binary blends of new random copolymer acceptors with a donor polymer can spontaneously self-organize into optimal bulk heterojunction morphologies and enable highly efficient all-PSCs with low energy loss and near unity internal quantum efficiency. Another finding is the different roles of charge transport, blend morphology, and blend photophysics in dictating the photovoltaic properties of NFA/polymer blends, highlighting the importance of fused-ring NFAs in suppressing geminate and bimolecular recombination and enabling improved photocurrent and fill factor. |
Tuesday, March 16, 2021 9:48AM - 10:24AM Live |
E01.00004: Programmable Biologic Drug Delivery using Electrostatic Polymer Assembly Invited Speaker: Paula Hammond By alternating positively and negatively charged molecules in sequence, it is possible to generate thin films one nano-layer at a time while controlling the composition of the film with great precision. This electrostatic layer-by-layer (LBL) process is a simple and elegant method of constructing highly tailored ultrathin polymer and organic-inorganic composite thin films. We have used this method to develop thin films that can encapsulate and release proteins and biologic drugs such as growth factors with highly preserved activity from the surfaces of biomedical implants or wound dressings with sustained release over periods of several days. We have engineered coatings that yield release of different drugs, DNA or protein, resulting in highly tunable multi-agent delivery nanolayered release systems for tissue engineering, biomedical devices, and wound healing applications. Finally, the manipulation of charge to target other tissues, in particular cartilage, is an important means of targeting the joint for osteoarthritis. We have generated unimolecular charged nanocarriers that can be precisely tuned to achieve deep penetration into avascular tissues such as cartilage to enable extended release treatments for cartilage regeneration. These and other uses of controlled polyelectrolytes and their complexes for delivery within tissues and across barriers will be addressed. |
Tuesday, March 16, 2021 10:24AM - 11:00AM Live |
E01.00005: Skin-inspired Organic Electronics Invited Speaker: Zhenan Bao Skin is the body’s largest organ, and is responsible for the transduction of a vast amount of information. This conformable, stretchable, self-healable and biodegradable material simultaneously collects signals from external stimuli that translate into information such as pressure, pain, and temperature. The development of electronic materials, inspired by the complexity of this organ is a tremendous, unrealized materials challenge. However, the advent of organic-based electronic materials may offer a potential solution to this longstanding problem. In this talk, I will describe the design of organic electronic materials to mimic skin functions. These new materials and new devices enabled arrange of new applications in medical devices, robotics and wearable electronics. |
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