Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session PP05: V: Optical, Electronic, Ionic, and Piezoelectric Properties of Polymers and Composites |
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Sponsoring Units: DPOLY Chair: Bryan Boudouris, Purdue University Room: Virtual Room 5 |
Tuesday, March 21, 2023 9:00AM - 9:12AM |
PP05.00001: Carbon Fiber Reinforced Polymer (CFRP) coated with 2D TMDs - WSe2, and topological insulator, Bi2Se3, films for EMI shielding applications. Jyotsna Das, Alexander Samokhvalov, Mark Mirotznik, Shashi P Karna, Dereje Seifu Electromagnetic interference (EMI) pollution is significantly caused by the high density of electronic equipment in our proximity due to the ever-growing IT industry. Remediation of EMI pollution can be in the form of engineered shielding materials. TMDs show layer-dependent shielding efficiency (SE) at microwave frequencies. At the same time, carbon composites are excellent EMI shielding materials, so we designed heterostructures of TMD and CFRP to get the combined efficiency. TMD materials - WSe2, a p-type semiconductor, and Bi2Se3 - a topological insulator (TI) are used used for coating on the CFRP. Thin films of WSe2 and Bi2Se3 (thickness 1ML and 10ML) were deposited on CFRP by pulsed DC and RF sputtering, respectively. The films transport properties were characterized by PPMS and structural properties by TEM, SAED, EDS, RAMAN and XPS. The shielding efficiency (SE) is measured using the free space-focused beam method for 18- 40 GHz. The SE of specimens varies from ~-60 dB to ~-4.0 dB, as applied electric field direction changes from transverse to orthogonal w.r.t the directions of the fibers. The increased SE of CFRPs coated with 2D TMDs, involves both reflection and absorption mechanisms, and result in a multifunctional electromagnetic material. The films were further pattern-coated with carbon nanotubes (CNT) to study the effect of CNT deposited in different shapes to increase the SE of the samples prepared. |
Tuesday, March 21, 2023 9:12AM - 9:24AM |
PP05.00002: PAAMPSA/PANI/PA Composite with AgnW Fillers Demonstrates Unprecedented Mechanical Performance Colton L Duprey Wearable sensors, stretchable electronics, and many soft robotics materials must have a |
Tuesday, March 21, 2023 9:24AM - 9:36AM |
PP05.00003: Theory of Electroactive Carbon Nanothreads Bohan Xu Nanothreads are one-dimensional rigid sp3 carbon frameworks synthesized by pressure-induced polymerization of aromatic precursors such as benzene or furan. Here we present a family of nanothreads that exhibit potential ferroelectricity, high dielectric constant, and memory effect. For instance, one type of pyrrole-based nanothreads has a one-dimensional stack of –NH functional groups that are anchored by the rigid nanothread backbone. The orientations of the chain of lone pairs can be modeled by electric-dipole-based one-dimensional Ising model. To help realize the stacking geometry, a synthesis strategy is used to identify a family of pyrrole-based monomers such as 3-trifluoroumethyl-pyrrole that are energetically favored to polymerize into the threads of interest over other isomers. |
Tuesday, March 21, 2023 9:36AM - 9:48AM |
PP05.00004: A Method for Production of Binder-Free Graphite Thin Films on Polyimide for Flexible Electronics Gimhani C Wickramasinghe, Rangana M Manamendra, Darshana L Weerawarne, Dilushan R Jayasundara Polyimide (PI) is extensively used in flexible electronic devices. In general, conductive interconnects are made on these substrates using electrically conductive inks with different additives. In this study, we optimized the interaction between graphite and polyimide to develop an adhesive thin film of graphite on DuPont Kapton (PI). The ink was produced from highly purified Sri Lankan vein-type graphite mixed with deionized water to form a thick film paste. The graphite films were fabricated on the PI substrate using the blading method and cured gradually in an oven. The hardness and adhesion properties of the thin films were evaluated according to the ASTM D3363 pencil hardness test and the ASTM D3359-78 crosshatch adhesion test. The results obtained through these tests indicated HB hardness and 5B standard with superior adherent graphite thin film on PI, respectively. The developed binder-free thin graphite films show a low sheet resistance in comparison with the reported values for similar tests on thin films in the presence of binders. This low-cost and scalable method of coating graphite on the surface of Polyimide can be applied in the commercially viable production of flexible electronic devices. |
Tuesday, March 21, 2023 9:48AM - 10:00AM |
PP05.00005: Up-converted coherent light emission inside of polar nematic liquid crystalline media DAICHI OKADA, Fumito Araoka, Hiroya Nishikawa Polar nematic liquid crystals (PNLCs) are kind of new types of fluid materials co-possessing fluidity and ferroelectricity. Since its discovery in 2017, it has attracted a lot of attention to the potential for novel applications such as flexible optical/optoelectrical devices. One of the most fascinating physical properties of PNLCs is efficient generation of optical second harmonics. Additionally, due to its fluidity, we can dope FNLCs with other functional molecules, enabling modification of their physical properties. |
Tuesday, March 21, 2023 10:00AM - 10:12AM |
PP05.00006: 1D structures of δ-PVDF for Self-powered Nanogenerator and Machine Learning Applications Varun Gupta Polyvinylidene fluoride (PVDF) and its copolymers are one of the potential material due their piezo-, pyro- and ferro-electric properties. [1, 2] In presence of external stimuli such as pressure, temperature and electric fields, it is possible utilize this semi-crystalline polymer for memory, sensors, actuators and energy harvesters' applications. PVDF has been prominently explored with electroactive β/γ-phase but the δ-phase of PVDF has not explored much due to higher electric field requirements to induce this phase. However, recently our group has made this possible through electrospray technique, to achieve the δ-phase at the lowest possible electric field, in the form of nanoparticles. [3] The major work δ-phase is performed on thick films only, which restricts the advanced application of this phase. So, to achieve the δ-phase nucleation in different morphologies, we have demonstrated the fabrication of predominant δ-phase based nanofibers. The nanofibers have shown better electroactive response as of the β/γ-phase, due to 1D nanoconfinement effect. Further, we have tried to explore the molecular configuration of polymer chain within these fibers and we have also fabricated the nanogenerator and demonstrated it as flexible mechanical [3] and thermal energy harvester. Further, to distinguish the various of features of the device response towards different external stimuli, we have demonstrated the machine learning classification for the sensor dataset. |
Tuesday, March 21, 2023 10:12AM - 10:24AM |
PP05.00007: Enhanced Nanoscale Piezoresponse and Ferroelectricity in Polymer Nanofiber Through Interfacial Interaction Controlled Molecular Dipole Orientation Using Perovskite Dopant Zinnia Mallick Amidst the worldwide growing energy demand, mechanical to electrical energy conversion through piezo- and ferroelectric effect can be a feasible solution. In this quest, piezoelectric polymer poly(vinylidene fluoride-hexafluoroproylene) (P(VDF-HFP)) has gained interest due to good mechano-sensitivity, flexibility and easy fabrication.1 Noteworthy that P(VDF-HFP) has different crystalline polymorphs including non-electroactive phase, α and electroactive β and γ.2,3 Here, inorganic halide perovskite (IHP) CsPbI3 was used as a dopant to nucleate the highest electroactive ferroelectric β-phase and explicit control of molecular dipole orientation responsible for the electroactive functionality of P(VDF-HFP). CsPbI3 aids in favourable molecular dipole orientation in electrospun P(VDF-HFP)-CsPbI3 composite nanofiber leading to enhanced nanoscale piezoresponse and ferroelectric switching. The composite nanofiber features a higher piezoelectric d33 coefficient of ∼30 pm/V and longer ferroelectric polarization retention. It was used for mechanical energy harvesting and achieved highest power density of ∼2 mW/m2. The nanofiber can monitor several human physiological motions which could be utilized in humanoid and surgical robotics in healthcare. |
Tuesday, March 21, 2023 10:24AM - 10:36AM |
PP05.00008: Single-ion Polymer Electrolytes via Macromolecular Engineering Emmanouil Glynos, Georgia Nikolakakou, Christos Pantazidis, Georgios Sakellariou Single-ion solid polymer electrolytes (SI-SPEs) represent the ultimate solution to the safety issues associated with the use of flammable and toxic liquid electrolytes in commercial Li-ion batteries and for the realization of high energy-density Li-metal batteries. In spite of the considerable research effort in SI-SPEs, the realization of their potential has been hindered by the inability to design materials that possess simultaneously, cation transference number close to unity (i.e. single-ion solid polymer electrolytes, r+ = 1), good mechanical properties, and high ionic conductivity. In this talk, we introduce the use of novel, stiff/glassy nanostructured polyanion particles, composed of polyanion miktoarm star copolymers of poly(styrene-4-sulfonyltrifluoromethylsulfonyl) imide lithium, PSTFSILi, arms that are complement to longer ion conducting poly(ethylene oxide), PEO, arms, (PSTFSILi)n(PEO)n, where n ≈ 22, attached to a poly(divinylbenzene), PDVB, crosslinked core as additives to liquid, oligomeric poly(ethylene oxide), PEO, electrolytes for the synthesis of SI-SPEs that are single-ion by design while exhibit an unparalleled combination of high shear modulus and Li-ion conductivity. Key to their performance is the morphology that stems from the ability of the (PSTFSILi)n(PEO)n nanoparticles to homogenously disperse within the liquid PEO electrolyte, allowing the development of a highly interconnected network of pure liquid PEO and the profounds effect of mikto arm architecture on the degree of ion dissociations that promotes high ionic conductivity. |
Tuesday, March 21, 2023 10:36AM - 10:48AM Author not Attending |
PP05.00009: Influence of Polymer Architecture on Phase Diagram, Ionic Conductivity, Free Volume, and Rheology in Poly (ethylene oxide) (PEO) Based Liquid Polymer Electrolytes Recep Bakar, Saeid Darvishi, Erkan Senses This study deals with the application of various architectures (linear, stars, and hyper-branched) of PEO and lithium contents to explore the effects of polymer architecture and salt content on the glass transition (Tg), crystallization, mechanical properties, and ionic conductivity of PEO based electrolytes. The phase diagrams showed strong dependence on the PEO topology such that PEOs with higher branching and salt ratios show lower crystallinity and melting temperature (Tm) in both their neat form and its electrolytes. Moreover, the addition of salt increasingly resulted in higher Tg values with decreasing Tm in all electrolytes. Additionally, the salt concentration-dependent Li-ion conductivities, which maximized at the molar ratio of [Li/EO = 0.085] for all architectures, showed that non-linear architectures with higher functionality had as much as 3x higher ionic conductivity than the linear analogue, which could be attributed to higher free volume probed by Positron Annihilation Spectroscopy and lower bulk viscosity in branched architectures with increasing functionality. Eventually, increasing the salt concentration further than [Li/EO = 0.085] always led a decrease in ion transportation due to formation of ion accumulation and clusters. |
Tuesday, March 21, 2023 10:48AM - 11:00AM |
PP05.00010: Lifetime of Metastable Knots in Polyampholyte Chains masoumeh ozmaeian, Dmitrii E Makarov
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