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Cardozo de Oliveira E, Xiang C, Esmann M, Lopez Abdala N, Fuertes M, Bruchhausen A, Pastoriza H, Perrin B, Soler-Illia G, Lanzillotti-Kimura N. Probing gigahertz coherent acoustic phonons in TiO 2 mesoporous thin films. PHOTOACOUSTICS 2023; 30:100472. [PMID: 36950519 PMCID: PMC10026033 DOI: 10.1016/j.pacs.2023.100472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Revised: 02/28/2023] [Accepted: 03/01/2023] [Indexed: 06/18/2023]
Abstract
Ultrahigh-frequency acoustic-phonon resonators usually require atomically flat interfaces to avoid phonon scattering and dephasing, leading to expensive fabrication processes, such as molecular beam epitaxy. Mesoporous thin films are based on inexpensive wet chemical fabrication techniques that lead to relatively flat interfaces regardless the presence of nanopores. Here, we report mesoporous titanium dioxide-based acoustic resonators with resonances up to 90 GHz, and quality factors from 3 to 7. Numerical simulations show a good agreement with the picosecond ultrasonics experiments. We also numerically study the effect of changes in the speed of sound on the performance of the resonator. This change could be induced by liquid infiltration into the mesopores. Our findings constitute the first step towards the engineering of building blocks based on mesoporous thin films for reconfigurable optoacoustic sensors.
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Affiliation(s)
- E.R. Cardozo de Oliveira
- Université Paris-Saclay, CNRS, Centre de Nanosciences et de Nanotechnologies, 91120 Palaiseau, France
| | - C. Xiang
- Université Paris-Saclay, CNRS, Centre de Nanosciences et de Nanotechnologies, 91120 Palaiseau, France
| | - M. Esmann
- Université Paris-Saclay, CNRS, Centre de Nanosciences et de Nanotechnologies, 91120 Palaiseau, France
- Institute for Physics, Carl von Ossietzky University of Oldenburg, 26129 Oldenburg, Germany
| | - N. Lopez Abdala
- Instituto de Nanosistemas, Escuela de Bio y Nanotecnologías, Universidad Nacional de San Martín-CONICET, Buenos Aires, Argentina
| | - M.C. Fuertes
- Gerencia Química, Inst. de Nanociencia y Nanotecnología, CNEA-CONICET, Buenos Aires, Argentina
| | - A. Bruchhausen
- Centro Atómico Bariloche, Inst. de Nanociencia y Nanotecnología, CNEA-CONICET, Rio Negro, Argentina
| | - H. Pastoriza
- Centro Atómico Bariloche, Inst. de Nanociencia y Nanotecnología, CNEA-CONICET, Rio Negro, Argentina
| | - B. Perrin
- Sorbonne Université, CNRS, Institut des NanoSciences de Paris, INSP, F-75005 Paris, France
| | - G.J.A.A. Soler-Illia
- Instituto de Nanosistemas, Escuela de Bio y Nanotecnologías, Universidad Nacional de San Martín-CONICET, Buenos Aires, Argentina
| | - N.D. Lanzillotti-Kimura
- Université Paris-Saclay, CNRS, Centre de Nanosciences et de Nanotechnologies, 91120 Palaiseau, France
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2
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Tao J, Khosravi H, Deshpande V, Li S. Engineering by Cuts: How Kirigami Principle Enables Unique Mechanical Properties and Functionalities. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 10:e2204733. [PMID: 36310142 PMCID: PMC9811446 DOI: 10.1002/advs.202204733] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Revised: 09/23/2022] [Indexed: 06/16/2023]
Abstract
Kirigami, the ancient art of paper cutting, has evolved into a design and fabrication framework to engineer multi-functional materials and structures at vastly different scales. By slit cutting with carefully designed geometries, desirable mechanical behaviors-such as accurate shape morphing, tunable auxetics, super-stretchability, buckling, and multistability-can be imparted to otherwise inflexible sheet materials. In addition, the kirigami sheet provides a versatile platform for embedding different electronic and responsive components, opening up avenues for building the next generations of metamaterials, sensors, and soft robotics. These promising potentials of kirigami-based engineering have inspired vigorous research activities over the past few years, generating many academic publications. Therefore, this review aims to provide insights into the recent advance in this vibrant field. In particular, this paper offers the first comprehensive survey of unique mechanical properties induced by kirigami cutting, their underlying physical principles, and their corresponding applications. The synergies between design methodologies, mechanics modeling, advanced fabrication, and material science will continue to mature this promising discipline.
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Affiliation(s)
- Jiayue Tao
- Department of Mechanical EngineeringClemson University224 Fluor Daniel Building, 216 South Palmetto BoulevardClemsonSC29631USA
| | - Hesameddin Khosravi
- Department of Mechanical EngineeringClemson University224 Fluor Daniel Building, 216 South Palmetto BoulevardClemsonSC29631USA
| | - Vishrut Deshpande
- Department of Mechanical EngineeringVirginia Tech153 Durham Hall, 1145 Perry StreetBlacksburgVA24060USA
| | - Suyi Li
- Department of Mechanical EngineeringVirginia Tech153 Durham Hall, 1145 Perry StreetBlacksburgVA24060USA
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3
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Cang Y, Sainidou R, Rembert P, Magnabosco G, Still T, Vogel N, Graczykowski B, Fytas G. Origin of the Acoustic Bandgaps in Hypersonic Colloidal Phononics: The Role of the Elastic Impedance. J Phys Chem B 2022; 126:6575-6584. [PMID: 35997523 PMCID: PMC9442645 DOI: 10.1021/acs.jpcb.2c03923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Revised: 08/11/2022] [Indexed: 11/30/2022]
Abstract
How phonons propagate in nanostructures determines the flow of elastic and thermal energy in dielectric materials. However, a reliable theoretical prediction of the phonon dispersion relation requires experimental verification both near to and far from the Brillouin zone of the nanostructure. We report on the experimental hypersonic phonon dispersion of hard (SiO2) and soft (polymer) fcc colloidal crystals infiltrated in liquid polydimethylsiloxane with different elastic impedance contrast using Brillouin light spectroscopy. We discuss the distinct differences with first-principles full elastodynamic calculations involving a multiple-scattering theory. Interparticle contacts strongly impact the long-wavelength speed of sound and the nature of the particle vibration resonance-induced hybridization hypersonic bandgap. The absence of the order-induced Bragg bandgap in SiO2 and its presence in soft opals cannot be fully accounted for by the theory, limiting its predictive power. Bridging the elasticity of the two colloidal crystals with suitable SiO2 core-shell (polymer) particles reveals an unprecedented crossover behavior in the dispersion relation. In view of many conversational parameters, the control tuning of phonon propagation in soft matter-based hypersonic phononics remains challenging.
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Affiliation(s)
- Yu Cang
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- School
of Aerospace Engineering and Applied Mechanics, Tongji University, Zhangwu
Road 100, Shanghai 200092, China
| | - Rebecca Sainidou
- Laboratoire
Ondes et Milieux Complexes UMR CNRS 6294, UNIHAVRE, Normandie University, 75 rue Bellot, F-76600 Le Havre, France
| | - Pascal Rembert
- Laboratoire
Ondes et Milieux Complexes UMR CNRS 6294, UNIHAVRE, Normandie University, 75 rue Bellot, F-76600 Le Havre, France
| | - Giulia Magnabosco
- Institute
of Particle Technology, Friedrich-Alexander
University Erlangen-Nürnberg, 91058 Erlangen, Germany
| | - Tim Still
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Nicolas Vogel
- Institute
of Particle Technology, Friedrich-Alexander
University Erlangen-Nürnberg, 91058 Erlangen, Germany
| | - Bartlomiej Graczykowski
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Faculty
of Physics, Adam Mickiewicz University, Uniwersytetu Poznanskiego 2, Poznan 61-614, Poland
| | - George Fytas
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Institute
of Electronic Structure and Laser, FO.R.T.H, N. Plastira 100, /0013, Heraklion 71110, Greece
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4
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Dörres T, Bartkiewicz M, Herrmann K, Schöttle M, Wagner D, Wang Z, Ikkala O, Retsch M, Fytas G, Breu J. Nanoscale-Structured Hybrid Bragg Stacks with Orientation- and Composition-Dependent Mechanical and Thermal Transport Properties: Implications for Nacre Mimetics and Heat Management Applications. ACS APPLIED NANO MATERIALS 2022; 5:4119-4129. [PMID: 35372797 PMCID: PMC8961742 DOI: 10.1021/acsanm.2c00061] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Accepted: 02/18/2022] [Indexed: 05/10/2023]
Abstract
Layered nanomaterials fascinate researchers for their mechanical, barrier, optical, and transport properties. Nacre is a biological example thereof, combining excellent mechanical properties by aligned submicron inorganic platelets and nanoscale proteinic interlayers. Mimicking nacre with advanced nanosheets requires ultraconfined organic layers aimed at nacre-like high reinforcement fractions. We describe inorganic/polymer hybrid Bragg stacks with one or two fluorohectorite clay layers alternating with one or two poly(ethylene glycol) layers. As indicated by X-ray diffraction, perfect one-dimensional crystallinity allows for homogeneous single-phase materials with up to a 84% clay volume fraction. Brillouin light spectroscopy allows the exploration of ultimate mechanical moduli without disturbance by flaws, suggesting an unprecedentedly high Young's modulus of 162 GPa along the aligned clays, indicating almost ideal reinforcement under these conditions. Importantly, low heat conductivity is observed across films, κ⊥ = 0.11-0.15 W m-1 K-1, with a high anisotropy of κ∥/κ⊥ = 28-33. The macroscopic mechanical properties show ductile-to-brittle change with an increase in the clay volume fraction from 54% to 70%. Conceptually, this work reveals the ultimate elastic and thermal properties of aligned layered clay nanocomposites in flaw-tolerant conditions.
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Affiliation(s)
- Theresa Dörres
- Bavarian
Polymer Institute (BPI) and Department of Chemistry, University of Bayreuth, Universitätsstrasse 30, Bayreuth 95440, Germany
| | | | - Kai Herrmann
- Bavarian
Polymer Institute (BPI) and Department of Chemistry, University of Bayreuth, Universitätsstrasse 30, Bayreuth 95440, Germany
| | - Marius Schöttle
- Bavarian
Polymer Institute (BPI) and Department of Chemistry, University of Bayreuth, Universitätsstrasse 30, Bayreuth 95440, Germany
| | - Daniel Wagner
- Bavarian
Polymer Institute (BPI) and Department of Chemistry, University of Bayreuth, Universitätsstrasse 30, Bayreuth 95440, Germany
| | - Zuyuan Wang
- School of
Mechanical and Electrical Engineering, University
of Electronic Science and Technology of China, Chengdu, Sichuan 611731, China
| | - Olli Ikkala
- Department
of Applied Physics, Aalto University, P.O. Box 15100, Espoo FI-00076, Finland
| | - Markus Retsch
- Bavarian
Polymer Institute (BPI) and Department of Chemistry, University of Bayreuth, Universitätsstrasse 30, Bayreuth 95440, Germany
| | - George Fytas
- Max
Planck Institute for Polymer Research, Ackermannweg 10, Mainz 55128, Germany
| | - Josef Breu
- Bavarian
Polymer Institute (BPI) and Department of Chemistry, University of Bayreuth, Universitätsstrasse 30, Bayreuth 95440, Germany
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5
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Graphene-Based One-Dimensional Terahertz Phononic Crystal: Band Structures and Surface Modes. NANOMATERIALS 2020; 10:nano10112205. [PMID: 33167353 PMCID: PMC7694383 DOI: 10.3390/nano10112205] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Revised: 11/01/2020] [Accepted: 11/02/2020] [Indexed: 11/17/2022]
Abstract
In this paper, we provide a theoretical and numerical study of the acoustic properties of infinite and semi-infinite superlattices made out of graphene-semiconductor bilayers. In addition to the band structure, we emphasize the existence and behavior of localized and resonant acoustic modes associated with the free surface of such structures. These modes are polarized in the sagittal plane, defined by the incident wavevector and the normal to the layers. The surface modes are obtained from the peaks of the density of states, either inside the bulk bands or inside the minigaps of the superlattice. In these structures, the two directions of vibrations (longitudinal and transverse) are coupled giving rise to two bulk bands associated with the two polarizations of the waves. The creation of the free surface of the superlattice induces true surface localized modes inside the terahertz acoustic forbidden gaps, but also pseudo-surface modes which appear as well-defined resonances inside the allowed bands of the superlattice. Despite the low thickness of the graphene layer, and though graphene is a gapless material, when it is inserted periodically in a semiconductor, it allows the opening of wide gaps for all values of the wave vector k// (parallel to the interfaces). Numerical illustrations of the band structures and surface modes are given for graphene-Si superlattices, and the surface layer can be either Si or graphene. These surface acoustic modes can be used to realize liquid or bio-sensors graphene-based phononic crystal operating in the THz frequency domain.
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6
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Dahod NS, France-Lanord A, Paritmongkol W, Grossman JC, Tisdale WA. Low-frequency Raman spectrum of 2D layered perovskites: Local atomistic motion or superlattice modes? J Chem Phys 2020; 153:044710. [PMID: 32752687 DOI: 10.1063/5.0012763] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
We report the low-frequency Raman spectrum (ω = 10 cm-1-150 cm-1) of a wide variety of alkylammonium iodide based 2D lead halide perovskites (2D LHPs) as a function of A-site cation (MA = methylammonium and FA = formamidinium), octahedral layer thickness (n = 2-4), organic spacer chain length (butyl-, pentyl-, hexyl-), and sample temperature (T = 77 K-293 K). Using density functional theory calculations under the harmonic approximation for n = 2 BA:MAPbI, we assign several longitudinal/transverse optical phonon modes between 30 cm-1 and 100 cm-1, the eigendisplacements of which are analogous to that observed previously for octahedral twists/distortions in bulk MAPbI. Additionally, we propose an alternative assignment for low-frequency modes below this band (<30 cm-1) as zone-folded longitudinal acoustic phonons corresponding to the periodicity of the entire layered structure. We compare measured spectra to predictions of the Rytov elastic continuum model for zone-folded dispersion in layered structures. Our results are consistent across the various 2D LHPs studied herein, with energetic shifts of optical phonons corresponding to microscopic structural differences between materials and energetic shifts of acoustic phonons according to changes in the periodicity and elastic properties of the perovskite/organic subphases. This study highlights the importance of both the local atomic order and the superlattice structure on the vibrational properties of layered 2D materials.
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Affiliation(s)
- Nabeel S Dahod
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Arthur France-Lanord
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Watcharaphol Paritmongkol
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Jeffrey C Grossman
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - William A Tisdale
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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7
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Hesami M, Gueddida A, Gomopoulos N, Dehsari HS, Asadi K, Rudykh S, Butt HJ, Djafari-Rouhani B, Fytas G. Elastic wave propagation in smooth and wrinkled stratified polymer films. NANOTECHNOLOGY 2019; 30:045709. [PMID: 30485250 DOI: 10.1088/1361-6528/aaee9b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Periodic materials with sub-micrometer characteristic length scale can provide means for control of propagation of hypersonic phonons. In addition to propagation stopbands for the acoustic phonons, distinct dispersive modes can reveal specific thermal and mechanical behavior under confinement. Here, we employ both experimental and theoretical methods to characterize the phonon dispersion relation (frequency versus wave vector). We employed Brillouin light scattering (BLS) spectroscopy to record the phonon dispersion in stratified multilayer polymer films. These films consist of 4-128 alternate polycarbonate (PC) and poly (methyl methacrylate) (PMMA) layers along and normal to the periodicity direction. The distinct direction-dependent phonon propagation was theoretically accounted for, by considering the polarization, frequency and intensity of the observed modes in the BLS spectra. Layer-guiding was also supported by the glass transition temperatures of the PC and PMMA layers. The number of phonon dispersion branches increased with the number of layers but only a few branches were observable by BLS. Introduction of an additional in-plane periodicity, through a permanent wrinkling of the smooth PC/PMMA films, had only subtle consequences in the phonon propagation. Using the frequencies of the periodicity induced modes and momentum conservation equation we were able to precisely back calculate the wrinkle periodicity. However, a wrinkling-induced acoustic stopband utilizing flexible layered materials is still a challenge.
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Affiliation(s)
- M Hesami
- Max Planck Institute for Polymer Research, Ackermannweg 10, D-55128, Mainz, Germany
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8
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Bolmatov D, Soloviov D, Zav'yalov D, Sharpnack L, Agra-Kooijman DM, Kumar S, Zhang J, Liu M, Katsaras J. Anomalous Nanoscale Optoacoustic Phonon Mixing in Nematic Mesogens. J Phys Chem Lett 2018; 9:2546-2553. [PMID: 29706065 DOI: 10.1021/acs.jpclett.8b00926] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Recent inelastic X-ray scattering (IXS) experiments on mesogens have revealed entirely new capabilities with regards to their nanoscale phonon-assisted heat management. Mesogens such as nematic liquid crystals (LCs) are appealing systems for study because their structure and morphology can easily be tuned. We report on Q-resolved ultra-high-resolution IXS, X-ray diffraction, and THz time-domain spectroscopy experiments combined with large-scale all-atom molecular dynamics simulations on the dynamic properties of 5CB LCs. For the first time, we observe a strong mixing of phonon excitations originating from independent in-phase and out-of-phase van-der-Waals-mediated displacement patterns. The coexistence of transverse acoustic and optical modes of 5CB LCs at near room temperature is revealed through the emergent transverse phonon gap and THz light-phonon coupling taking place within the same energy range. Furthermore, our experimental observations are supported by analysis showing correlations of spontaneous fluctuations of LCs on picosecond time scales. These findings are significant for the design of a new generation of soft molecular vibration-sensitive nanoacoustic and optomechanical applications.
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Affiliation(s)
- Dima Bolmatov
- Neutron Scattering Directorate , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States
- Department of Physics and Astronomy , University of Tennessee , Knoxville , Tennessee 37996 , United States
| | - Dmytro Soloviov
- Frank Laboratory of Neutron Physics , Joint Institute for Nuclear Research , Dubna 141980 , Russia
- Taras Shevchenko National University of Kyiv , Kyiv 01033 , Ukraine
- Moscow Institute of Physics and Technology , Dolgoprudny 141701 , Russia
| | - Dmitry Zav'yalov
- Volgograd State Technical University , Volgograd 400005 , Russia
| | - Lewis Sharpnack
- European Synchrotron Radiation Facility , Grenoble 38043 , France
| | - Deña M Agra-Kooijman
- Liquid Crystal Institute , Kent State University , Kent , Ohio 44242 , United States
| | - Satyendra Kumar
- Division of Research and Department of Physics , University at Albany , Albany , New York 12222 , United States
| | - Jiawei Zhang
- Department of Physics and Astronomy , Stony Brook University , Stony Brook , New York 11794 , United States
| | - Mengkun Liu
- Department of Physics and Astronomy , Stony Brook University , Stony Brook , New York 11794 , United States
| | - John Katsaras
- Neutron Scattering Directorate , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States
- Department of Physics and Astronomy , University of Tennessee , Knoxville , Tennessee 37996 , United States
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9
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Schechtel E, Yan Y, Xu X, Cang Y, Tremel W, Wang Z, Li B, Fytas G. Elastic Modulus and Thermal Conductivity of Thiolene/TiO 2 Nanocomposites. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2017; 121:25568-25575. [PMID: 29755637 PMCID: PMC5941249 DOI: 10.1021/acs.jpcc.7b08425] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2017] [Revised: 10/04/2017] [Indexed: 05/11/2023]
Abstract
Metal oxide based polymer nanocomposites find diverse applications as functional materials, and in particular thiol-ene/TiO2 nanocomposites are promising candidates for dental restorative materials. The important mechanical and thermal properties of the nanocomposites, however, are still not well understood. In this study, the elastic modulus and thermal conductivity of thiol-ene/TiO2 nanocomposite thin films with varying weight fractions of TiO2 nanoparticles are investigated by using Brillouin light scattering spectroscopy and 3ω measurements, respectively. As the TiO2 weight fraction increases from 0 to 90%, the effective elastic longitudinal modulus of the films increases from 6.2 to 37.5 GPa, and the effective thermal conductivity from 0.04 to 0.76 W/m K. The former increase could be attributed to the covalent cross-linking of the nanocomposite constituents. The latter one could be ascribed to the addition of high thermal conductivity TiO2 nanoparticles and the formation of possible conductive channels at high TiO2 weight fractions. The linear dependence of the thermal conductivity on the sound velocity, reported for amorphous polymers, is not observed in the present nanocomposite system.
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Affiliation(s)
- Eugen Schechtel
- Johannes
Gutenberg University, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Yaping Yan
- Center
for Phononics and Thermal Energy Science, School of Physics and Engineering
and Institute of Advanced Study, Tongji
University, Shanghai 200092, China
| | - Xiangfan Xu
- Center
for Phononics and Thermal Energy Science, School of Physics and Engineering
and Institute of Advanced Study, Tongji
University, Shanghai 200092, China
| | - Yu Cang
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Wolfgang Tremel
- Johannes
Gutenberg University, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Zuyuan Wang
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Baowen Li
- Department
of Mechanical Engineering, University of
Colorado, Boulder 80309, United States
| | - George Fytas
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
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10
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Alonso-Redondo E, Gueddida A, Huesmann H, El Abouti O, Tremel W, El Boudouti EH, Djafari-Rouhani B, Fytas G. Direction-dependent elastic properties and phononic behavior of PMMA/BaTiO3 nanocomposite thin films. J Chem Phys 2017; 146:203325. [PMID: 28571385 DOI: 10.1063/1.4978675] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Affiliation(s)
- E. Alonso-Redondo
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - A. Gueddida
- Institut d’Electronique, de Microélectronique et de Nanotechnologie (IEMN), UMR-CNRS 8520, UFR de Physique, Université de Lille 1, 59655 Villeneuve d’Ascq, France
- LPMR, Département de Physique, Faculté des Sciences, Université Mohamed I, 60000 Oujda, Morocco
| | - H. Huesmann
- Department of Inorganic Chemistry, Johannes Gutenberg University, Duesbergweg 10-14, 55128 Mainz, Germany
| | - O. El Abouti
- LPMR, Département de Physique, Faculté des Sciences, Université Mohamed I, 60000 Oujda, Morocco
| | - W. Tremel
- Department of Inorganic Chemistry, Johannes Gutenberg University, Duesbergweg 10-14, 55128 Mainz, Germany
| | - E. H. El Boudouti
- LPMR, Département de Physique, Faculté des Sciences, Université Mohamed I, 60000 Oujda, Morocco
| | - B. Djafari-Rouhani
- Institut d’Electronique, de Microélectronique et de Nanotechnologie (IEMN), UMR-CNRS 8520, UFR de Physique, Université de Lille 1, 59655 Villeneuve d’Ascq, France
| | - G. Fytas
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
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11
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Liu J, Zhao H, Wu M, Van der Schueren B, Li Y, Deparis O, Ye J, Ozin GA, Hasan T, Su BL. Slow Photons for Photocatalysis and Photovoltaics. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29:1605349. [PMID: 28165167 DOI: 10.1002/adma.201605349] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Revised: 11/17/2016] [Indexed: 05/25/2023]
Abstract
Solar light is widely recognized as one of the most valuable renewable energy sources for the future. However, the development of solar-energy technologies is severely hindered by poor energy-conversion efficiencies due to low optical-absorption coefficients and low quantum-conversion yield of current-generation materials. Huge efforts have been devoted to investigating new strategies to improve the utilization of solar energy. Different chemical and physical strategies have been used to extend the spectral range or increase the conversion efficiency of materials, leading to very promising results. However, these methods have now begun to reach their limits. What is therefore the next big concept that could efficiently be used to enhance light harvesting? Despite its discovery many years ago, with the potential for becoming a powerful tool for enhanced light harvesting, the slow-photon effect, a manifestation of light-propagation control due to photonic structures, has largely been overlooked. This review presents theoretical as well as experimental progress on this effect, revealing that the photoreactivity of materials can be dramatically enhanced by exploiting slow photons. It is predicted that successful implementation of this strategy may open a very promising avenue for a broad spectrum of light-energy-conversion technologies.
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Affiliation(s)
- Jing Liu
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, 430070, Wuhan, Hubei, China
| | - Heng Zhao
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, 430070, Wuhan, Hubei, China
| | - Min Wu
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, 430070, Wuhan, Hubei, China
| | - Benoit Van der Schueren
- Laboratory of Inorganic Materials Chemistry (CMI), University of Namur, 61 rue de Bruxelles, B-5000, Namur, Belgium
| | - Yu Li
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, 430070, Wuhan, Hubei, China
| | - Olivier Deparis
- Solid State Physics Laboratory, University of Namur, 61 rue de Bruxelles, B-5000, Namur, Belgium
| | - Jinhua Ye
- Research Unit for Environmental Remediation Materials, National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki, 305-0047, Japan
| | - Geoffrey A Ozin
- University of Toronto, Lash Miller Building Room 326 80 St. George Street, Toronto, Ontario, M5S3H6, Canada
| | - Tawfique Hasan
- Cambridge Graphene Centre, University of Cambridge, Cambridge, CB3 0FA, UK
| | - Bao-Lian Su
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, 430070, Wuhan, Hubei, China
- Clare Hall, University of Cambridge, Herschel Road, Cambridge, CB3 9AL, UK
- Laboratory of Inorganic Materials Chemistry (CMI), University of Namur, 61 rue de Bruxelles, B-5000, Namur, Belgium
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12
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Alonso-Redondo E, Gueddida A, Li J, Graczykowski B, Sotomayor Torres CM, Pennec Y, Yang S, Djafari-Rouhani B, Fytas G. Directional elastic wave propagation in high-aspect-ratio photoresist gratings: liquid infiltration and aging. NANOSCALE 2017; 9:2739-2747. [PMID: 28045161 DOI: 10.1039/c6nr08312a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Determination of the mechanical properties of nanostructured soft materials and their composites in a quantitative manner is of great importance to improve the fidelity in their fabrication and to enable the subsequent reliable utility. Here, we report on the characterization of the elastic and photoelastic parameters of a periodic array of nanowalls (grating) by the non-invasive Brillouin light scattering technique and finite element calculations. The resolved elastic vibrational modes in high and low aspect ratio nanowalls reveal quantitative and qualitative differences related to the two-beam interference lithography fabrication and subsequent aging under ambient conditions. The phononic properties, namely the dispersion relations, can be drastically altered by changing the surrounding material of the nanowalls. Here we demonstrate that liquid infiltration turns the phononic function from a single-direction phonon-guiding to an anisotropic propagation along the two orthogonal directions. The susceptibility of the phononic behavior to the infiltrating liquid can be of unusual benefits, such as sensing and alteration of the materials under confinement.
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Affiliation(s)
- E Alonso-Redondo
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
| | - A Gueddida
- Institut d'Electronique, de Microélectronique et de Nanotechnologie (IEMN), UMR-CNRS 8520, UFR de Physique, Université de Lille 1, 59655 Villeneuve d'Ascq, France and LPMR, Département de Physique, Faculté des Sciences, Université Mohamed I, 60000 Oujda, Morocco
| | - J Li
- Department of Materials Science and Engineering, University of Pennsylvania, 3231 Walnut Street, Philadelphia, PA 19104, USA
| | - B Graczykowski
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and the Barcelona Institute of Science and Technology, Campus UAB, 08193 Bellaterra, Spain
| | - C M Sotomayor Torres
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and the Barcelona Institute of Science and Technology, Campus UAB, 08193 Bellaterra, Spain and ICREA, Pg. Lluís Companys 23, 08010 Barcelona, Spain
| | - Y Pennec
- Institut d'Electronique, de Microélectronique et de Nanotechnologie (IEMN), UMR-CNRS 8520, UFR de Physique, Université de Lille 1, 59655 Villeneuve d'Ascq, France
| | - S Yang
- Department of Materials Science and Engineering, University of Pennsylvania, 3231 Walnut Street, Philadelphia, PA 19104, USA
| | - B Djafari-Rouhani
- Institut d'Electronique, de Microélectronique et de Nanotechnologie (IEMN), UMR-CNRS 8520, UFR de Physique, Université de Lille 1, 59655 Villeneuve d'Ascq, France
| | - G Fytas
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany. and Department of Materials Science, University of Crete and IESL/FORTH, 71110 Heraklion, Greece
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13
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Wagner MR, Graczykowski B, Reparaz JS, El Sachat A, Sledzinska M, Alzina F, Sotomayor Torres CM. Two-Dimensional Phononic Crystals: Disorder Matters. NANO LETTERS 2016; 16:5661-5668. [PMID: 27580163 DOI: 10.1021/acs.nanolett.6b02305] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The design and fabrication of phononic crystals (PnCs) hold the key to control the propagation of heat and sound at the nanoscale. However, there is a lack of experimental studies addressing the impact of order/disorder on the phononic properties of PnCs. Here, we present a comparative investigation of the influence of disorder on the hypersonic and thermal properties of two-dimensional PnCs. PnCs of ordered and disordered lattices are fabricated of circular holes with equal filling fractions in free-standing Si membranes. Ultrafast pump and probe spectroscopy (asynchronous optical sampling) and Raman thermometry based on a novel two-laser approach are used to study the phononic properties in the gigahertz (GHz) and terahertz (THz) regime, respectively. Finite element method simulations of the phonon dispersion relation and three-dimensional displacement fields furthermore enable the unique identification of the different hypersonic vibrations. The increase of surface roughness and the introduction of short-range disorder are shown to modify the phonon dispersion and phonon coherence in the hypersonic (GHz) range without affecting the room-temperature thermal conductivity. On the basis of these findings, we suggest a criteria for predicting phonon coherence as a function of roughness and disorder.
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Affiliation(s)
- Markus R Wagner
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology , Campus UAB, Bellaterra, 08193 Barcelona, Spain
| | - Bartlomiej Graczykowski
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology , Campus UAB, Bellaterra, 08193 Barcelona, Spain
| | - Juan Sebastian Reparaz
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology , Campus UAB, Bellaterra, 08193 Barcelona, Spain
| | - Alexandros El Sachat
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology , Campus UAB, Bellaterra, 08193 Barcelona, Spain
| | - Marianna Sledzinska
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology , Campus UAB, Bellaterra, 08193 Barcelona, Spain
| | - Francesc Alzina
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology , Campus UAB, Bellaterra, 08193 Barcelona, Spain
| | - Clivia M Sotomayor Torres
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology , Campus UAB, Bellaterra, 08193 Barcelona, Spain
- ICREA - Catalan Institute for Research and Advanced Studies , 08010 Barcelona, Spain
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14
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Wright OB, Matsuda O. Watching surface waves in phononic crystals. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2015. [PMID: 26217053 DOI: 10.1098/rsta.2014.0364] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
In this paper, we review results obtained by ultrafast imaging of gigahertz surface acoustic waves in surface phononic crystals with one- and two-dimensional periodicities. By use of quasi-point-source optical excitation, we show how, from a series of images that form a movie of the travelling waves, the dispersion relation of the acoustic modes, their corresponding mode patterns and the position and widths of phonon stop bands can be obtained by temporal and spatio-temporal Fourier analysis. We further demonstrate how one can follow the temporal evolution of phononic eigenstates in k-space using data from phononic-crystal waveguides as an example.
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Affiliation(s)
- Oliver B Wright
- Division of Applied Physics, Faculty of Engineering, Hokkaido University, 060-8628 Sapporo, Japan
| | - Osamu Matsuda
- Division of Applied Physics, Faculty of Engineering, Hokkaido University, 060-8628 Sapporo, Japan
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15
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Alonso-Redondo E, Huesmann H, El Boudouti EH, Tremel W, Djafari-Rouhani B, Butt HJ, Fytas G. Phoxonic Hybrid Superlattice. ACS APPLIED MATERIALS & INTERFACES 2015; 7:12488-95. [PMID: 25855860 DOI: 10.1021/acsami.5b01247] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
We studied experimentally and theoretically the direction-dependent elastic and electromagnetic wave propagation in a supported film of hybrid PMMA (poly[methyl-methacrylate])-TiO2 superlattice (SL). In the direction normal to the layers, this one-dimensional periodic structure opens propagation band gaps for both hypersonic (GHz) phonons and near-UV photons. The high mismatch of elastic and optical impedance results in a large dual phoxonic band gap. The presence of defects inherent to the spin-coating fabrication technique is sensitively manifested in the band gap region. Utilizing Brillouin light scattering, phonon propagation along the layers was observed to be distinctly different from propagation normal to them and can, under certain conditions (SL thickness and substrate elasticity), reveal the nanomechanical properties of the constituent layers. Besides the first realization of unidirectional phoxonic behavior, hybrid (soft-hard) periodic materials are a promising simple platform for opto-acoustic interactions and applications such as filters and Bragg mirrors.
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Affiliation(s)
- Elena Alonso-Redondo
- ‡Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Hannah Huesmann
- §Department of Inorganic Chemistry, Johannes Gutenberg University, Duesbergweg 10-14, 55128 Mainz, Germany
| | - El-Houssaine El Boudouti
- ⊥LDOM, Département de Physique, Faculté des Sciences, Université Mohamed I, 60000 Oujda, Morocco
- #Institut d'Électronique, de Microélectronique et de Nanotechnologie (IEMN), UMR-CNRS 8520, UFR de Physique, Université de Lille 1, 59655 Villeneuve d'Ascq, France
| | - Wolfgang Tremel
- §Department of Inorganic Chemistry, Johannes Gutenberg University, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Bahram Djafari-Rouhani
- #Institut d'Électronique, de Microélectronique et de Nanotechnologie (IEMN), UMR-CNRS 8520, UFR de Physique, Université de Lille 1, 59655 Villeneuve d'Ascq, France
| | - Hans-Juergen Butt
- ‡Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - George Fytas
- ‡Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- ||Department of Materials Science, University of Crete and IESL/FORTH, 71110 Heraklion, Greece
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16
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Aluculesei A, Pipertzis A, Piunova VA, Miyake GM, Floudas G, Fytas G, Grubbs RH. Thermomechanical Behavior and Local Dynamics of Dendronized Block Copolymers and Constituent Homopolymers. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b00779] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- A. Aluculesei
- Department
of Materials Science, FORTH-IESL, P.O. Box 1527, 71110 Heraklion, Greece
| | - A. Pipertzis
- Department
of Physics, University of Ioannina, 45110 Ioannina, Greece
| | - V. A. Piunova
- Arnold
and Mabel Beckmam Laboratories for Chemical Synthesis, Division of
Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - G. M. Miyake
- Arnold
and Mabel Beckmam Laboratories for Chemical Synthesis, Division of
Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - G. Floudas
- Department
of Physics, University of Ioannina, 45110 Ioannina, Greece
| | - G. Fytas
- Department
of Materials Science, FORTH-IESL, P.O. Box 1527, 71110 Heraklion, Greece
- Max Planck Institute
for Polymer Research, D-55128 Mainz, Germany
| | - R. H. Grubbs
- Arnold
and Mabel Beckmam Laboratories for Chemical Synthesis, Division of
Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
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17
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Zhang JS, Bass JD, Zhu G. Single-crystal Brillouin spectroscopy with CO2 laser heating and variable q. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2015; 86:063905. [PMID: 26133848 DOI: 10.1063/1.4922634] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Accepted: 06/05/2015] [Indexed: 06/04/2023]
Abstract
We describe a Brillouin spectroscopy system integrated with CO2 laser-heating and Raman spectroscopic capabilities. Temperature is determined by measurements of the grey-body thermal radiation emitted by the hot sample, with the system response calibrated relative to a standard tungsten ribbon lamp. High-pressure laser-heating Brillouin scattering measurements of acoustic velocities on liquid water and ice compressed in a diamond-anvil cell were performed at temperatures up to 2500 ± 150 K at high pressure. Single-crystal laser-heating Brillouin measurements were made on the (111) plane of San Carlos olivine at ∼13 GPa, 1300 ± 200 K. The pressure as measured by ruby fluorescence is shown to be within ±0.5 GPa of the pressure on the olivine sample during laser heating when KCl and KBr are used as pressure-transmitting media. In addition, the system is designed for continuously variable scattering angles from forward scattering (near 0° scattering angle) up to near back scattering (∼141°). This novel setup allows us to probe a wide range of wave vectors q for investigation of phonon dispersion on, for example, crystals with large unit cells (on the scale of hundreds of nm).
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Affiliation(s)
- Jin S Zhang
- Department of Geology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
| | - Jay D Bass
- Department of Geology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
| | - Gaohua Zhu
- Materials Research Department, Toyota Research Institute of North America, Ann Arbor, Michigan 48105, USA
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18
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Liaqat F, Tahir MN, Schechtel E, Kappl M, Auernhammer GK, Char K, Zentel R, Butt HJ, Tremel W. High-performance TiO2 nanoparticle/DOPA-polymer composites. Macromol Rapid Commun 2015; 36:1129-37. [PMID: 25929974 DOI: 10.1002/marc.201400706] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2014] [Revised: 04/07/2015] [Indexed: 12/31/2022]
Abstract
Many natural materials are complex composites whose mechanical properties are often outstanding considering the weak constituents from which they are assembled. Nacre, made of inorganic (CaCO3 ) and organic constituents, is a textbook example because of its strength and toughness, which are related to its hierarchical structure and its well-defined organic-inorganic interface. Emulating the construction principles of nacre using simple inorganic materials and polymers is essential for understanding how chemical composition and structure determine biomaterial functions. A hard multilayered nanocomposite is assembled based on alternating layers of TiO2 nanoparticles and a 3-hydroxy-tyramine (DOPA) substituted polymer (DOPA-polymer), strongly cemented together by chelation through infiltration of the polymer into the TiO2 mesocrystal. With a Young's modulus of 17.5 ± 2.5 GPa and a hardness of 1.1 ± 0.3 GPa the resulting material exhibits high resistance against elastic as well as plastic deformation. A key feature leading to the high strength is the strong adhesion of the DOPA-polymer to the TiO2 nanoparticles.
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Affiliation(s)
- Faroha Liaqat
- Institute for Inorganic and Analytical Chemistry; Johannes Gutenberg-University; Duesbergweg 10-14 55099 Mainz Germany
| | - Muhammad Nawaz Tahir
- Institute for Inorganic and Analytical Chemistry; Johannes Gutenberg-University; Duesbergweg 10-14 55099 Mainz Germany
| | - Eugen Schechtel
- Institute for Inorganic and Analytical Chemistry; Johannes Gutenberg-University; Duesbergweg 10-14 55099 Mainz Germany
| | - Michael Kappl
- Max Planck Institute for Polymer Research; Ackermannweg 10 55128 Mainz Germany
| | | | - Kookheon Char
- School of Chemical and Biological Engineering; The National Creative Research Initiative Center for Intelligent Hybrids; The WCU Program of Chemical Convergence for Energy and Environment; Seoul National University; 1 Gwanak-ro Gwanak-gu Seoul 151-744 South Korea
| | - Rudolf Zentel
- Institute for Organic Chemistry; Johannes Gutenberg-University; Duesbergweg 10-14 55099 Mainz Germany
| | - Hans-Jürgen Butt
- Max Planck Institute for Polymer Research; Ackermannweg 10 55128 Mainz Germany
| | - Wolfgang Tremel
- Institute for Inorganic and Analytical Chemistry; Johannes Gutenberg-University; Duesbergweg 10-14 55099 Mainz Germany
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19
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Beltramo PJ, Schneider D, Fytas G, Furst EM. Anisotropic hypersonic phonon propagation in films of aligned ellipsoids. PHYSICAL REVIEW LETTERS 2014; 113:205503. [PMID: 25432048 DOI: 10.1103/physrevlett.113.205503] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2014] [Indexed: 05/24/2023]
Abstract
A material with anisotropic elastic mechanical properties and a direction-dependent hypersonic band gap is fabricated using ac electric field-directed convective self-assembly of colloidal ellipsoids. The frequency of the gap, which is detected in the direction perpendicular to particle alignment and entirely absent parallel to alignment, and the effective sound velocities can be tuned by the particle aspect ratio. We hypothesize that the band gap originates from the primary eigenmode peak, the m-splitted (s,1,2) mode, of the particle resonating with the effective medium. These results reveal the potential for powerful control of the hypersonic phononic band diagram by combining anisotropic particles and self-assembly.
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Affiliation(s)
- Peter J Beltramo
- Department of Chemical & Biomolecular Engineering, Center for Molecular and Engineering Thermodynamics, University of Delaware, Newark, Delaware 19716, USA
| | - Dirk Schneider
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - George Fytas
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany and Department of Materials Science, University of Crete and IESL-FORTH, 71110 Heraklion, Greece
| | - Eric M Furst
- Department of Chemical & Biomolecular Engineering, Center for Molecular and Engineering Thermodynamics, University of Delaware, Newark, Delaware 19716, USA
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20
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Zhao D, Schneider D, Fytas G, Kumar SK. Controlling the thermomechanical behavior of nanoparticle/polymer films. ACS NANO 2014; 8:8163-73. [PMID: 25072707 DOI: 10.1021/nn503486e] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
We show that the mesoscale (∼200 nm) thermomechanical properties of polymer nanocomposites formed from silica nanoparticles (NPs) and poly(2-vinylpyridine) (P2VP) critically depend on their interfacial structure, which can be controlled by the casting solvent. The composite films are solvent cast from either pyridine (PYR) or methylethylketone (MEK), with uniform NP spatial distribution obtained in both cases. In the films cast from MEK, our previous work has shown that a bound layer of P2VP is formed at the NP surfaces, while no such bound layer is formed when PYR is used as the casting solvent. In PYR as-cast films, Brillouin light scattering reveals a single acoustic phonon with its longitudinal sound velocity increasing with NP loading. This implies a homogeneous mixture of the NP and the polymer on the mesoscopic scales for all compositions examined. However, in the MEK as-cast films, two longitudinal and two transverse acoustic phonons are observed at NP loadings above ∼20 wt % (or ∼11 vol %), reminiscent of two metastable microscopic phases. The dense microphase is attributed to the bridging of NPs by P2VP chains, whereas for the softer medium, we conjecture that there exists an interfacial lower density P2VP layer whose longitudinal sound velocity barely changes with NP loading. These solvent-induced differences in the (elastic) mechanical behavior disappear upon thermal annealing, suggesting that these nanocomposite interfacial structures in the as-cast state (far from equilibrium) locally approach equilibrium (i.e., near equilibrium after annealing). Consistent with these conclusions, the abrupt decrease of the longitudinal sound velocity with temperature occurs at a single glass transition temperature for the annealed nanocomposites irrespective of the casting solvent used, which assumes only a slightly higher (∼5 K at 45 wt % or ∼29 vol %) value than that in bulk P2VP. The results emphasize the important role of solvent in determining the interfacial structure of nanocomposites, which can be used to tailor their thermomechanical behavior.
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Affiliation(s)
- Dan Zhao
- Department of Chemical Engineering, Columbia University , 500 West 120th Street, New York, New York 10027, United States
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21
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Wu S, Zhu G, Zhang JS, Banerjee D, Bass JD, Ling C, Yano K. Anisotropic lattice expansion of three-dimensional colloidal crystals and its impact on hypersonic phonon band gaps. Phys Chem Chem Phys 2014; 16:8921-6. [PMID: 24691556 DOI: 10.1039/c4cp00498a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report anisotropic expansion of self-assembled colloidal polystyrene-poly(dimethylsiloxane) crystals and its impact on the phonon band structure at hypersonic frequencies. The structural expansion was achieved by a multistep infiltration-polymerization process. Such a process expands the interplanar lattice distance 17% after 8 cycles whereas the in-plane distance remains unaffected. The variation of hypersonic phonon band structure induced by the anisotropic lattice expansion was recorded by Brillouin measurements. In the sample before expansion, a phononic band gap between 3.7 and 4.4 GHz is observed; after 17% structural expansion, the gap is shifted to a lower frequency between 3.5 and 4.0 GHz. This study offers a facile approach to control the macroscopic structure of colloidal crystals with great potential in designing tunable phononic devices.
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Affiliation(s)
- Songtao Wu
- Toyota Research Institute of North America, Toyota Motor Engineering and Manufacturing North America, Inc., Ann Arbor, Michigan 48105, USA.
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22
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Lee JH, Koh CY, Singer JP, Jeon SJ, Maldovan M, Stein O, Thomas EL. 25th anniversary article: ordered polymer structures for the engineering of photons and phonons. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2014; 26:532-69. [PMID: 24338738 PMCID: PMC4227607 DOI: 10.1002/adma.201303456] [Citation(s) in RCA: 85] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2013] [Indexed: 05/21/2023]
Abstract
The engineering of optical and acoustic material functionalities via construction of ordered local and global architectures on various length scales commensurate with and well below the characteristic length scales of photons and phonons in the material is an indispensable and powerful means to develop novel materials. In the current mature status of photonics, polymers hold a pivotal role in various application areas such as light-emission, sensing, energy, and displays, with exclusive advantages despite their relatively low dielectric constants. Moreover, in the nascent field of phononics, polymers are expected to be a superior material platform due to the ability for readily fabricated complex polymer structures possessing a wide range of mechanical behaviors, complete phononic bandgaps, and resonant architectures. In this review, polymer-centric photonic and phononic crystals and metamaterials are highlighted, and basic concepts, fabrication techniques, selected functional polymers, applications, and emerging ideas are introduced.
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Affiliation(s)
- Jae-Hwang Lee
- Department of Materials Science and Nanoengineering Rice UniversityHouston, TX, 77005, USA E-mail: ;
| | | | - Jonathan P Singer
- Department of Materials Science and Engineering, MITCambridge, MA, 02139, USA
| | - Seog-Jin Jeon
- Department of Materials Science and Nanoengineering Rice UniversityHouston, TX, 77005, USA E-mail: ;
| | - Martin Maldovan
- Department of Materials Science and Engineering, MITCambridge, MA, 02139, USA
| | - Ori Stein
- Department of Materials Science and Nanoengineering Rice UniversityHouston, TX, 77005, USA E-mail: ;
| | - Edwin L Thomas
- Department of Materials Science and Nanoengineering Rice UniversityHouston, TX, 77005, USA E-mail: ;
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23
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Schneider D, Liaqat F, El Boudouti EH, El Abouti O, Tremel W, Butt HJ, Djafari-Rouhani B, Fytas G. Defect-controlled hypersound propagation in hybrid superlattices. PHYSICAL REVIEW LETTERS 2013; 111:164301. [PMID: 24182268 DOI: 10.1103/physrevlett.111.164301] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2013] [Revised: 09/17/2013] [Indexed: 06/02/2023]
Abstract
We employ spontaneous Brillouin light scattering spectroscopy and detailed theoretical calculations to reveal and identify elastic excitations inside the band gap of hypersonic hybrid superlattices. Surface and cavity modes, their strength and anticrossing are unambiguously documented and fully controlled by layer thickness, elasticity, and sequence design. This new soft matter based superlattice platform allows facile engineering of the density of states and opens new pathways to tunable phoxonic crystals.
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Affiliation(s)
- Dirk Schneider
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
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