Bulletin of the American Physical Society
APS March Meeting 2017
Volume 62, Number 4
Monday–Friday, March 13–17, 2017; New Orleans, Louisiana
Session E10: Polymer Nanocomposites Related to Optical and Plasmonic PropertiesFocus
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Sponsoring Units: DPOLY Chair: Gholiang Liu, Virginia Tech Room: 269 |
Tuesday, March 14, 2017 8:00AM - 8:12AM |
E10.00001: EMPTY SLOT |
Tuesday, March 14, 2017 8:12AM - 8:24AM |
E10.00002: EMPTY SLOT |
Tuesday, March 14, 2017 8:24AM - 8:36AM |
E10.00003: EMPTY SLOT |
Tuesday, March 14, 2017 8:36AM - 8:48AM |
E10.00004: Low Intensity Post Process Tuning of Optical Properties of Polymer-Plasmonic Nanoparticle Hybrids Clare Mahoney, Kyoungweon Park, Richard Vaia The ability to fabricate flat optics with graded refractive indices through patterned plasmonic properties is attractive for compact photonics devices. Because simultaneous self-assembly of different nanostructures within a singular film is challenging, recent efforts have shifted towards post processing methods. For example, lasers coupled to surface plasmon resonances (SPR) can induce reshaping, but often times require intense power densities that damage the matrix. Herein, we demonstrate a lower temperature approach to nanostructure reshaping based on photo-thermal triggered local redox chemistry. Xe-lamp is shown to provide volume-conserved reshaping of gold nanrods (AuNRs) dispersed within polyvinyl alcohol . Within seconds, the aspect ratio can be reduced from 5.5 to 1 ( \textgreater 500 nm shift in the LSPR) while maintaining particle dispersion and alignment. Using the irradiation profile and matrix thermal diffusivity, gradient resolutions of 3 nm LSPR shift per micron are seen both spatially and through thickness. Furthermore, the polarization sensitivity of the LSPR enables polarization control in reshaping. Such scalable and energy efficient plasmonic post processes will be crucial to optical-nanocomposites into future technologies. [Preview Abstract] |
Tuesday, March 14, 2017 8:48AM - 9:00AM |
E10.00005: Probing polymer heat transport and dynamics via photothermal heating from metal nanoparticles Laura Clarke, Gabriel Firestone, Jason Bochinski Metal nanoparticles strongly absorb specific wavelengths of visible/infrared light which is efficiently converted to local heat (a photothermal effect). Polymer films doped with a small concentration of metal nanoparticles can then be probed by applying internal heat at nano- and meso- length scales. When a constant light intensity is applied, and internal temperature is monitored, the transient response of the system as it approaches steady state reveals information about the heat losses present, and how heat transport changes with temperature. The steady state temperature versus position within photothermally-heated samples is not homogeneous. By measuring temperature via embedded fluorescent molecules, independent monitoring (due to polarization sensitivity) of molten and solid regions can be accomplished. Altering the nanoparticle concentration and light intensity can reveal information about both the temperature profile due to photothermal heating and the polymer's innate response to heat application at different length scales. [Preview Abstract] |
Tuesday, March 14, 2017 9:00AM - 9:12AM |
E10.00006: Precisely Size-Tunable Magnetic/Plasmonic Core/Shell Nanoparticles with Controlled Optical Properties. Zhiqun Lin, Beibei Jiang, Xinchang Pang, Bo Li Star-like amphiphilic triblock copolymers were rationally designed and synthesized by combining two sequential atom-transfer radical polymerization reactions with a click reaction. Subsequently, a family of uniform magnetic/plasmonic core/shell nanoparticles was crafted by capitalizing on these triblock copolymers as nanoreactors. The diameter of the magnetic core and the thickness of the plasmonic shell could be independently and accurately controlled by varying the molecular weights (i.e., the chain lengths) of the inner and intermediate blocks of the star-like triblock copolymers, respectively. The surface plasmonic absorption of core/shell nanoparticles with different core diameters and shell thicknesses was systematically studied and theoretically modeled. This robust strategy provides easy access to a large variety of multifunctional nanoparticles with large lattice mismatches for use in optics, optoelectronics, catalysis, or bioimaging. [Preview Abstract] |
Tuesday, March 14, 2017 9:12AM - 9:24AM |
E10.00007: Thermal and Photo Actuators Based on Temperature-Responsive Hydrogel and Nanocomposites Ying Zhou, Adam Hauser, Mark Kuzyk, Ryan Hayward Combining temperature-responsive hydrogels with plasmonic nanoparticles that transduce light into heat provides a simple and effective route to prepare photo-responsive materials. Using nanocomposites of poly(N-isopropyl acrylamide) (PNIPAm) hydrogels loaded with gold nanoparticles, we explore the fabrication and light-induced deformation of micro-scale actuators with different geometries: planar bilayers prepared by photo lithography and cylindrical actuators fabricated by depositing PNIPAm droplets on fibers of passive materials. We characterize the extent and kinetics of bending and unbending in response to temperature, flood illumination, and waveguided light. [Preview Abstract] |
Tuesday, March 14, 2017 9:24AM - 9:36AM |
E10.00008: Determining heat loss from the surface of polymer films via modeling of experimental fluorescence thermometry Gabriel Firestone, Jason Bochinski, Jeffrey Meth, Laura Clarke Understanding of the heat transfer characteristics of a polymer during processing is critical to predicting and controlling the resulting properties and has been studied extensively in injection molding. As new methodologies for polymer processing are developed, such as photothermal heating, it is important to build an understanding of how heat transfer properties change under these novel conditions. By combining theoretical and experimental approaches, the thermal properties of photothermally heated polymer films were measured. The key idea is that by measuring the steady state temperature profile of a spot heated polymer film via a fluorescence probe (the temperature versus distance from the heated region) and fitting to a theoretical model, heat transfer coefficients can be extracted. We apply this approach to three different polymer systems, crosslinked epoxy, poly(methyl methacrylate) and poly(ethylene oxide) thin films with a range of thicknesses, under different heating laser intensities and with different resultant temperatures. We will discuss the resultant trends and extension of the model beyond a simple spot heating configuration. [Preview Abstract] |
Tuesday, March 14, 2017 9:36AM - 9:48AM |
E10.00009: Sensitivity of plasmonic metal nanoparticles and their potential in plasmonic polymer nanocomposites Assad Khan, Guoliang Liu Currently the synthesis of plasmonic nanoparticles for sensing mostly focuses on the shape because it is believed that nanoparticles with sharp tips provide higher sensitivities than those without. Herein, by measuring and analyzing the sensitivities of more than 74 types of nanoparticles of various shapes, sizes, and compositions, we found that, contrary to this common belief, the correlation between shape and sensitivity is much weaker than that between aspect ratio and sensitivity. Among all the parameters investigated here including size, shape, composition, aspect ratio, cross-sectional area, and initial plasmonic resonance frequency, the aspect ratio is the key parameter that controls the nanoparticle sensitivity. Other parameters have much less influence on the nanoparticle sensitivity to refractive index changes. This finding can provide insight into the design of plasmonic nanomaterials for polymer sensing and polymer nanocomposites with advanced optical and plasmonic properties. [Preview Abstract] |
Tuesday, March 14, 2017 9:48AM - 10:24AM |
E10.00010: Self-Assembly of Nanoparticles and Origin of Life Invited Speaker: Nicholas Kotov Inorganic nanoparticles (NPs) have the ability to self-organize into variety of extended and terminal structures, as do many molecular and nanoscale compounds, given a sufficient number of translational and rotational degrees of freedom. Analysis of experimental data for all NPs (metal, semiconductor, ceramic ..) indicate a general trend of self-assembly under a much wider range of conditions and having much broader structural variability than “building blocks” from organic matter. Remarkably, the internal organization of self-assembled structures spontaneously produced by NPs rival in complexity and functional sophistication to those found in biology. Multiscale collective effects make NP-NP interactions no less fascinating than those of naturally occurring proteins. In this talk, I will address the following questions:\\ \\$1.$ What are the differences and similarities of NP self-organization compared with similar phenomena involving organic and biological building blocks?\newline 2. What are the forces and related theoretical assumptions essential for NP interactions?\newline 3. What is the significance of NP self-assembly for understanding emergence of life?\\ \\ In this context, self-organization of chiral nanostructures will illustrate the importance of subtle anisotropic effects stemming from collective behavior of NPs and non-additivity of their interactions. Chirality transfer from circularly-polarized photons to NPs and its relationship to the origin of homochirality on Earth, spontaneous compartmentalization (protocells), and out-of-equilibrium chemical synthesis in nanoassemblies. \\ \textbf{REFERENCES}\newline 1. Kotov, N. A., Science 2010 330 188.\newline 2. Srivastava S.; et al. Science 2010 327 1355.\newline 3. Yeom, J.; et al., Nature Mater. 2015 14 66.\newline 4. Batista C.et al Science 2015 DOI:10.1126/science.1242477. \newline 5. Ming Yang, et al Nature Chem. 2016 DOI:10.1038/NCHEM.2641 [Preview Abstract] |
Tuesday, March 14, 2017 10:24AM - 10:36AM |
E10.00011: Plasmonic nanoparticles as sensors to probe the kinetics of polymer brush formation on two-dimensional nanoparticles Assad Khan, Guoliang Liu Plasmonic nanoparticles are sensitive to surroundings and can detect changes in refractive index. Based on our previous finding in plasmonic nanoparticle sensitivity, we have synthesized two-dimensional Ag nanodisks as sensors to probe the kinetics of polymer brush formation. Unitizing the unique plasmonic properties of Ag nanodisks, we demonstrated in situ the three-regime kinetics of polymer brush grafting process, and importantly, for the first time we experimentally revealed the cause of a latent regime in the process of polymer brush grafting onto a surface. The latent regime is a period of time that polymer molecules stop grafting onto the surface before molecule saturation, the cause of which has been a long-lasting puzzle in the field of polymer brush. The findings here can provide insight into the functionalization of plasmonic nanoparticles for their applications in polymer nanocomposites. [Preview Abstract] |
Tuesday, March 14, 2017 10:36AM - 10:48AM |
E10.00012: Polymer Single Crystal Directed Nanoparticle Assembly Shan Mei, Hao Qi, Tian Zhou, Christopher Li Gold nanoparticles (AuNPs) have raised great interests due to their special properties such as SPR phenomenon. In recent decade, huge amount of work has been done to the self or directed assembly of AuNPs into varies of ordered structures so that more unique properties could be discovered and can be magnified to larger scale. In this work we report a directed assembly method of AuNPs into well defined, free standing frame structure using poly(ethylene oxide) (PEO) lamellar single crystal as the template. Here, PEO/PEO-b-P4VP single crystals were employed as a template to guide the assembly of AuNP as well as a medium to crosslink the AuNPs. By controlling the single crystal size and PEO-b-P4VP pattern, we are able to tune the size and width of the AuNP frame. We consider this approach to be an efficient way to assemble AuNPs and this methodology could be applied to other metal or semiconductor NPs. [Preview Abstract] |
Tuesday, March 14, 2017 10:48AM - 11:00AM |
E10.00013: Abstract Withdrawn |
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