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Wang Z, Kim H, Secchi M, Montagna M, Furst EM, Djafari-Rouhani B, Fytas G. Quantization of Acoustic Modes in Dumbbell Nanoparticles. PHYSICAL REVIEW LETTERS 2022; 128:048003. [PMID: 35148122 DOI: 10.1103/physrevlett.128.048003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Accepted: 01/05/2022] [Indexed: 06/14/2023]
Abstract
The vibrational eigenmodes of dumbbell-shaped polystyrene nanoparticles are recorded by Brillouin light spectroscopy (BLS), and the full experimental spectra are calculated theoretically. Different from spheres with a degeneracy of (2l+1), with l being the angular momentum quantum number, the eigenmodes of dumbbells are either singly or doubly degenerate owing to their axial symmetry. The BLS spectrum reveals a new, low-frequency peak, which is attributed to the out-of-phase vibration of the two lobes of the dumbbell. The quantization of acoustic modes in these molecule-shaped dumbbell particles evolves from the primary colloidal spheres as the separation between the two lobes increases.
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Affiliation(s)
- Zuyuan Wang
- Max Planck Institute for Polymer Research, Ackermannweg 10, Mainz 55128, Germany
- Institute for Measurement and Automation, Division of Sensor Technology and Measurement Systems, Bundeswehr University Munich, Werner Heisenberg Weg 39, 85579 Neubiberg, Germany
| | - Hojin Kim
- Department of Chemical & Biomolecular Engineering, Allan P. Colburn Laboratory, University of Delaware, Newark, Delaware 19716, USA
| | - Maria Secchi
- Department of Industrial Engineering, University of Trento, via Sommarive 9, I-38123 Trento, Italy
| | - Maurizio Montagna
- Dipartimento di Fisica, Universitá di Trento, via Sommarive 14, I-38123 Trento, Italy
| | - Eric M Furst
- Department of Chemical & Biomolecular Engineering, Allan P. Colburn Laboratory, University of Delaware, Newark, Delaware 19716, USA
| | - Bahram Djafari-Rouhani
- Institut d'Électronique, de Microélectronique et de Nanotechnologie (IEMN), UMRCNRS 8520, Department of Physics, University of Lille, Villeneuve d'Ascq 59655, France
| | - George Fytas
- Max Planck Institute for Polymer Research, Ackermannweg 10, Mainz 55128, Germany
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2
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Noual A, Kang E, Maji T, Gkikas M, Djafari-Rouhani B, Fytas G. Optomechanic Coupling in Ag Polymer Nanocomposite Films. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2021; 125:14854-14864. [PMID: 34295447 PMCID: PMC8287562 DOI: 10.1021/acs.jpcc.1c04549] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 06/15/2021] [Indexed: 05/08/2023]
Abstract
Particle vibrational spectroscopy has emerged as a new tool for the measurement of elasticity, glass transition, and interactions at a nanoscale. For colloid-based materials, however, the weakly localized particle resonances in a fluid or solid medium renders their detection difficult. The strong amplification of the inelastic light scattering near surface plasmon resonance of metallic nanoparticles (NPs) allowed not only the detection of single NP eigenvibrations but also the interparticle interaction effects on the acoustic vibrations of NPs mediated by strong optomechanical coupling. The "rattling" and quadrupolar modes of Ag/polymer and polymer-grafted Ag NPs with different diameters in their assemblies are probed by Brillouin light spectroscopy (BLS). We present thorough theoretical 3D calculations for anisotropic Ag elasticity to quantify the frequency and intensity of the "rattling" mode and hence its BLS activity for different interparticle separations and matrix rigidity. Theoretically, a liquidlike environment, e.g., poly(isobutylene) (PIB) does not support rattling vibration of Ag dimers but unexpectedly hardening of the extremely confined graft melt renders both activation of the former and a frequency blue shift of the fundamental quadrupolar mode in the grafted nanoparticle Ag@PIB film.
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Affiliation(s)
- Adnane Noual
- Faculté
Pluridisciplinaire Nador, LPMR, Université
Mohammed Premier, Oujda BP 717-60 000, Morocco
| | - Eunsoo Kang
- Max
Planck Institute for Polymer Research, Ackermannweg 10, Mainz 55128, Germany
| | - Tanmoy Maji
- Department
of Chemistry, University of Massachusetts
Lowell, Lowell, Massachusetts 01854, United States
| | - Manos Gkikas
- Department
of Chemistry, University of Massachusetts
Lowell, Lowell, Massachusetts 01854, United States
| | - Bahram Djafari-Rouhani
- Institut
d’Électronique, de Microélectronique et de Nanotechnologie
(IEMN), UMR-CNRS 8520, Department of Physics, University of Lille, Villeneuve d’Ascq 59655, France
| | - George Fytas
- Max
Planck Institute for Polymer Research, Ackermannweg 10, Mainz 55128, Germany
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3
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Cang Y, Liu B, Das S, Xu X, Xie J, Deng X, Fytas G. Surface contacts strongly influence the elasticity and thermal conductivity of silica nanoparticle fibers. Phys Chem Chem Phys 2021; 23:3707-3715. [PMID: 33398320 DOI: 10.1039/d0cp05377e] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Granular materials are often encountered in science and engineering disciplines, in which controlling the particle contacts is one of the critical issues for the design, engineering, and utilization of their desired properties. The achievable rapid fabrication of nanoparticles with tunable physical and chemical properties facilitates tailoring the macroscopic properties of particle assemblies through contacts at the nanoscale. Models have been developed to predict the mechanical properties of macroscopic granular materials; however, their predicted power in the case of nanoparticle assemblies is still uncertain. Here, we investigate the influence of nanocontacts on the elasticity and thermal conductivity of a granular fiber comprised of close-packed silica nanoparticles. A complete elastic moduli characterization was realized by non-contact and non-destructive Brillouin light spectroscopy, which also allowed resolving the stiffness of the constituent particles in situ. In the framework of effective medium models, the strong enhancement of the elastic moduli is attributed to the formation of adhesive nanocontacts with physical and/or chemical bondings. The nanoparticle contacts are also responsible for the increase in the fiber thermal conductivity that emphasizes the role of interface thermal resistance, which tends to be ignored in most porosity models. This insight into the fundamental understanding of structure-property relationships advances knowledge on the manipulation of granular systems at the nanoscale.
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Affiliation(s)
- Yu Cang
- School of Aerospace Engineering and Applied Mechanics, Tongji University, 100 Zhangwu Road, 200092, Shanghai, China and Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany.
| | - Bohai Liu
- Center for Phononics and Thermal Energy Science, School of Physical Science and Engineering, Tongji University, Shanghai, 200092, China
| | - Sudatta Das
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany.
| | - Xiangfan Xu
- Center for Phononics and Thermal Energy Science, School of Physical Science and Engineering, Tongji University, Shanghai, 200092, China
| | - Jingli Xie
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 610054, China
| | - Xu Deng
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 610054, China
| | - George Fytas
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany.
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4
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Abi Ghanem M, Khanolkar A, Wallen SP, Helwig M, Hiraiwa M, Maznev AA, Vogel N, Boechler N. Longitudinal eigenvibration of multilayer colloidal crystals and the effect of nanoscale contact bridges. NANOSCALE 2019; 11:5655-5665. [PMID: 30865190 DOI: 10.1039/c8nr08453j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Longitudinal contact-based vibrations of colloidal crystals with a controlled layer thickness are studied. These crystals consist of 390 nm diameter polystyrene spheres arranged into close packed, ordered lattices with a thickness of one to twelve layers. Using laser ultrasonics, eigenmodes of the crystals that have out-of-plane motion are excited. The particle-substrate and effective interlayer contact stiffnesses in the colloidal crystals are extracted using a discrete, coupled oscillator model. Extracted stiffnesses are correlated with scanning electron microscope images of the contacts and atomic force microscope characterization of the substrate surface topography after removal of the spheres. Solid bridges of nanometric thickness are found to drastically alter the stiffness of the contacts, and their presence is found to be dependent on the self-assembly process. Measurements of the eigenmode quality factors suggest that energy leakage into the substrate plays a role for low frequency modes but is overcome by disorder- or material-induced losses at higher frequencies. These findings help further the understanding of the contact mechanics, and the effects of disorder in three-dimensional micro- and nano-particulate systems, and open new avenues to engineer new types of micro- and nanostructured materials with wave tailoring functionalities via control of the adhesive contact properties.
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Affiliation(s)
- Maroun Abi Ghanem
- Department of Mechanical and Aerospace Engineering, University of California San Diego, La Jolla, CA, 92093 USA.
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5
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Singaraju AB, Bahl D, Stevens LL. Brillouin Light Scattering: Development of a Near Century-Old Technique for Characterizing the Mechanical Properties of Materials. AAPS PharmSciTech 2019; 20:109. [PMID: 30746575 DOI: 10.1208/s12249-019-1311-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Accepted: 01/15/2019] [Indexed: 11/30/2022] Open
Abstract
Brillouin light scattering (BLS), a technique theoretically described nearly a century back by the French physicist Léon Brillouin in 1922, is a light-scattering method for determining the mechanical properties of materials. This inelastic scattering method is described by the Bragg diffraction of light from a propagating fluctuation in the local dielectric. These fluctuations arise spontaneously from thermally populated sound waves intrinsic to all materials, and thus BLS may be broadly applied to transparent samples of any phase. This review begins with a brief historical overview of the development of BLS, from its theoretical prediction to the current state of the art, and notes specific technological advancements that enabled the development of BLS. Despite the broad utility of BLS, no commercial spectrometer is currently available for purchase, but rather individual components are assembled to suit a specific application. Central to any BLS spectrometer is the interferometer, and its performance characteristics-scanning or non-scanning, multi-passing, and stabilization-are critical considerations for spectrometer design. Consistent with any light-scattering method, the frequency shift is a key observable in BLS, and we summarize the connection of this measurement to evaluate the mechanical properties of materials. With emphasis toward pharmaceutical materials analysis, we introduce the traditional BLS approach for single-crystal elasticity, and this is followed by a discussion of more recent developments in powder BLS. We conclude our review with a perspective on future developments in BLS that may enable BLS as a novel addition to the current catalog of process analytical technologies.
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Kim H, Cang Y, Kang E, Graczykowski B, Secchi M, Montagna M, Priestley RD, Furst EM, Fytas G. Direct observation of polymer surface mobility via nanoparticle vibrations. Nat Commun 2018; 9:2918. [PMID: 30046038 PMCID: PMC6060150 DOI: 10.1038/s41467-018-04854-w] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Accepted: 05/24/2018] [Indexed: 11/08/2022] Open
Abstract
Measuring polymer surface dynamics remains a formidable challenge of critical importance to applications ranging from pressure-sensitive adhesives to nanopatterning, where interfacial mobility is key to performance. Here, we introduce a methodology of Brillouin light spectroscopy to reveal polymer surface mobility via nanoparticle vibrations. By measuring the temperature-dependent vibrational modes of polystyrene nanoparticles, we identify the glass-transition temperature and calculate the elastic modulus of individual nanoparticles as a function of particle size and chemistry. Evidence of surface mobility is inferred from the first observation of a softening temperature, where the temperature dependence of the fundamental vibrational frequency of the nanoparticles reverses slope below the glass-transition temperature. Beyond the fundamental vibrational modes given by the shape and elasticity of the nanoparticles, another mode, termed the interaction-induced mode, was found to be related to the active particle-particle adhesion and dependent on the thermal behavior of nanoparticles.
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Affiliation(s)
- Hojin Kim
- Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, DE, 19716, USA
| | - Yu Cang
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Eunsoo Kang
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Bartlomiej Graczykowski
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
- NanoBioMedical Centre, Adam Mickiewicz University, ul. Umultowska 85, Poznan, 61-614, Poland
| | - Maria Secchi
- Department of Industrial Engineering, University of Trento, 38123, Trento, Italy
| | | | - Rodney D Priestley
- Department of Chemical and Biological Engineering, Princeton University, Princeton, NJ, 08544, USA
| | - Eric M Furst
- Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, DE, 19716, USA.
| | - George Fytas
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany.
- IESL-FORTH, N. Plastira 100, 70013, Heraklion, Crete, Greece.
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7
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Mohapatra H, Kruger TM, Lansakara TI, Tivanski AV, Stevens LL. Core and surface microgel mechanics are differentially sensitive to alternative crosslinking concentrations. SOFT MATTER 2017; 13:5684-5695. [PMID: 28744535 PMCID: PMC6207079 DOI: 10.1039/c7sm00727b] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Microgel mechanics are central to the swelling of stimuli-responsive materials and furthermore have recently emerged as a novel design space for tuning the uptake of nanotherapeutics. Despite this importance, the techniques available to assess mechanics, at the sub-micron scale, remain limited. In this report, all mechanical moduli for a series of air-dried, polystyrene-co-poly(N-isopropylacrylamide) (pS-co-NIPAM) microgels of varying composition in monomer and crosslinker (N,N'-methylene-bisacrylamide (BIS)) mol% have been determined using Brillouin light scattering (BLS) and AFM nanoindentation. These techniques sample the material through distinct means and provide complementary nanomechanical data. An initial demonstration of this combined approach is used to evaluate size-dependent nanomechanics in pS particles of varying diameter. For the pS-co-NIPAM series, our BLS results demonstrate an increase in Young's (E) and shear moduli with increasing NIPAM and/or BIS mol%, while the Poisson's ratio decreased. The same rank order in E was observed from AFM and the two techniques correlate well. However, at low BIS crosslinking, an inverted particle structure persists and small increases in BIS yield a higher increase in E from AFM relative to BLS, consistent with a higher density at the particle surface. At higher BIS incorporation, the microgel reverts to a typical, dense-core structure and further increasing BIS yields changes to core-particle mechanics reflected in BLS. Lastly, at 75 mol% NIPAM, the microgels displayed a broad volume phase transition and increased crosslinking resulted in a minor, yet unexpected, increase in swelling ratio. This complementary approach offers new insight into nanomechanics critical for microgel design and application.
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Affiliation(s)
- Himansu Mohapatra
- Division of Pharmaceutics and Translational Therapeutics, College of Pharmacy, The University of Iowa, Iowa City, IA 52242, USA.
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8
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Schneider D, Schmitt M, Hui CM, Sainidou R, Rembert P, Matyjaszewski K, Bockstaller MR, Fytas G. Role of Polymer Graft Architecture on the Acoustic Eigenmode Formation in Densely Polymer-Tethered Colloidal Particles. ACS Macro Lett 2014; 3:1059-1063. [PMID: 35610792 DOI: 10.1021/mz500433h] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The concurrent evaluation of the vibration eigenfrequencies in densely polymer-tethered particle systems ("particle brushes") by Brillouin light scattering and elastodynamic theory reveals a distinctive change of acoustic eigenmode formation associated with polymer graft modification of colloidal particles. The eigenfrequencies of particle brushes reveal a characteristic red-shift compared to uniform core-shell particles that can only be rationalized by assuming imperfect boundary conditions and anisotropic elastic properties of the graft layer. The distinct characteristics of vibration modes in particle brush materials provide direct evidence for the implications of chain confinement on the nanomechanical properties of tethered chains. The results highlight a rich and hitherto unexplored parameter-space for controlling properties and interactions in particle-brush based systems that could spur the development of hybrid materials with novel functionalities.
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Affiliation(s)
- Dirk Schneider
- Max Planck Institute
for Polymer Research, Ackermannweg
10, 55128 Mainz, Germany
| | - Michael Schmitt
- Department
of Materials Science and Engineering, Carnegie Mellon University, 5000
Forbes Ave., Pittsburgh, Pennsylvania 15213, United States
| | - Chin Ming Hui
- Chemistry
Department, Carnegie Mellon University, 4400 Fifth Ave., Pittsburgh, Pennsylvania 15213, United States
| | - Rebecca Sainidou
- Laboratoire
Ondes et Milieux Complexes (LOMC), UMR CNRS 6294, University of Le Havre, 75 Rue Bellot, 76058 Le Havre Cedex, France
| | - Pascal Rembert
- Laboratoire
Ondes et Milieux Complexes (LOMC), UMR CNRS 6294, University of Le Havre, 75 Rue Bellot, 76058 Le Havre Cedex, France
| | - Krzysztof Matyjaszewski
- Chemistry
Department, Carnegie Mellon University, 4400 Fifth Ave., Pittsburgh, Pennsylvania 15213, United States
| | - Michael R. Bockstaller
- Department
of Materials Science and Engineering, Carnegie Mellon University, 5000
Forbes Ave., Pittsburgh, Pennsylvania 15213, United States
| | - George Fytas
- Max Planck Institute
for Polymer Research, Ackermannweg
10, 55128 Mainz, Germany
- Department of
Materials Science and FORTH-IESL P.O. Box 1527, 71110 Heraklion, Greece
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9
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Sirotkin S, Mermet A, Bergoin M, Ward V, Van Etten JL. Viruses as nanoparticles: structure versus collective dynamics. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2014; 90:022718. [PMID: 25215769 DOI: 10.1103/physreve.90.022718] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2014] [Indexed: 06/03/2023]
Abstract
In order to test the application of the "nanoparticle" concept to viruses in terms of low-frequency dynamics, large viruses (140-190 nm) were compared to similar-sized polymer colloids using ultra-small-angle x-ray scattering and very-low-frequency Raman or Brillouin scattering. While both viruses and polymer colloids show comparable highly defined morphologies, with comparable abilities of forming self-assembled structures, their respective abilities to confine detectable acoustic vibrations, as expected for such monodisperse systems, differed. Possible reasons for these different behaviors are discussed.
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Affiliation(s)
- S Sirotkin
- Institut Lumière Matière, Université de Lyon, Université Claude Bernard Lyon 1, UMR CNRS 5306, 69622 Villeurbanne, France
| | - A Mermet
- Institut Lumière Matière, Université de Lyon, Université Claude Bernard Lyon 1, UMR CNRS 5306, 69622 Villeurbanne, France
| | - M Bergoin
- Laboratoire de Virologie Comparé des Invertébrés, E.P.H.E., Université Montpellier 2, France
| | - V Ward
- University of Otago, Department of Microbology and Immunology, New Zealand
| | - J L Van Etten
- Department of Plant Pathology and the Nebraska Center for Virology, University of Nebraska-Lincoln, Lincoln, Nebraska USA
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10
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Mattarelli M, Secchi M, Montagna M. Phononic crystals of spherical particles: A tight binding approach. J Chem Phys 2013; 139:174710. [DOI: 10.1063/1.4828436] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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11
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Comment on ‘Selection rules for Brillouin light scattering from eigenvibrations of a sphere’ [Chem. Phys. Lett. 461 (2008) 111]. Chem Phys Lett 2012. [DOI: 10.1016/j.cplett.2011.12.027] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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12
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Sun JY, Wang ZK, Lim HS, Ng SC, Kuok MH, Tran TT, Lu X. Hypersonic vibrations of Ag@SiO2 (cubic core)-shell nanospheres. ACS NANO 2010; 4:7692-7698. [PMID: 21087022 DOI: 10.1021/nn102581g] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The intriguing optical and catalytic properties of metal-silica core-shell nanoparticles, inherited from their plasmonic metallic cores together with the rich surface chemistry and increased stability offered by their silica shells, have enabled a wide variety of applications. In this work, we investigate the confined vibrational modes of a series of monodisperse Ag@SiO(2) (cubic core)-shell nanospheres synthesized using a modified Stöber sol-gel method. The particle-size dependence of their mode frequencies has been mapped by Brillouin light scattering, a powerful tool for probing hypersonic vibrations. Unlike the larger particles, the observed spheroidal-like mode frequencies of the smaller ones do not scale with inverse diameter. Interestingly, the onset of the deviation from this linearity occurs at a smaller particle size for higher-energy modes than for lower-energy ones. Finite element simulations show that the mode displacement profiles of the Ag@SiO(2) core-shells closely resemble those of a homogeneous SiO(2) sphere. Simulations have also been performed to ascertain the effects that the core shape and the relative hardness of the core and shell materials have on the vibrations of the core-shell as a whole. As the vibrational modes of a particle have a bearing on its thermal and mechanical properties, the findings would be of value in designing core-shell nanostructures with customized thermal and mechanical characteristics.
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Affiliation(s)
- Jing Ya Sun
- Department of Physics, National University of Singapore, Singapore 117542, Singapore
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13
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Still T, Retsch M, Jonas U, Sainidou R, Rembert P, Mpoukouvalas K, Fytas G. Vibrational Eigenfrequencies and Mechanical Properties of Mesoscopic Copolymer Latex Particles. Macromolecules 2010. [DOI: 10.1021/ma1001589] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tim Still
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Markus Retsch
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Ulrich Jonas
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Department of Materials Science and Technology, University of Crete and FORTH, 71110 Heraklion, Greece
| | - Rebecca Sainidou
- Laboratoire Ondes et Milieux Complexes LOMC FRE CNRS 3102, Université du Havre, Pl. R. Schuman, 76610 Le Havre, France
| | - Pascal Rembert
- Laboratoire Ondes et Milieux Complexes LOMC FRE CNRS 3102, Université du Havre, Pl. R. Schuman, 76610 Le Havre, France
| | | | - George Fytas
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Department of Materials Science and Technology, University of Crete and FORTH, 71110 Heraklion, Greece
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14
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Still T, D’Acunzi M, Vollmer D, Fytas G. Mesospheres in nano-armor: Probing the shape-persistence of molten polymer colloids. J Colloid Interface Sci 2009; 340:42-5. [DOI: 10.1016/j.jcis.2009.08.022] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2009] [Revised: 08/03/2009] [Accepted: 08/13/2009] [Indexed: 10/20/2022]
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15
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Still T, Sainidou R, Retsch M, Jonas U, Spahn P, Hellmann GP, Fytas G. The "music" of core-shell spheres and hollow capsules: influence of the architecture on the mechanical properties at the nanoscale. NANO LETTERS 2008; 8:3194-9. [PMID: 18767884 DOI: 10.1021/nl801500n] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
We report on the first measurement of elastic vibrational modes in core-shell spheres (silica-poly(methyl methacrylate), SiO2-PMMA) and corresponding spherical hollow capsules (PMMA) with different particle size and shell thickness using Brillouin light scattering, supported by numerical calculations. These localized modes allow access to the mechanical moduli down to a few tens of nanometers. We observe reduced mechanical strength of the porous silica core, and for the core-shell spheres a striking increase of the moduli in both the SiO2 core and the PMMA shell. The peculiar behavior of the vibrational modes in the hollow capsules is attributed to antagonistic dependence on overall size and layer thickness in agreement with theoretical predictions.
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Affiliation(s)
- T Still
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
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16
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Li Y, Lim H, Ng S, Wang Z, Kuok M. Selection rules for Brillouin light scattering from eigenvibrations of a sphere. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.07.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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17
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Akimov AV, Tanaka Y, Pevtsov AB, Kaplan SF, Golubev VG, Tamura S, Yakovlev DR, Bayer M. Hypersonic modulation of light in three-dimensional photonic and phononic band-gap materials. PHYSICAL REVIEW LETTERS 2008; 101:033902. [PMID: 18764257 DOI: 10.1103/physrevlett.101.033902] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2007] [Revised: 05/13/2008] [Indexed: 05/09/2023]
Abstract
The elastic coupling between the a-SiO2 spheres composing opal films brings forth three-dimensional periodic structures which besides a photonic stop band are predicted to also exhibit complete phononic band gaps. The influence of elastic crystal vibrations on the photonic band structure has been studied by injection of coherent hypersonic wave packets generated in a metal transducer by subpicosecond laser pulses. These studies show that light with energies close to the photonic band gap can be efficiently modulated by hypersonic waves.
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Affiliation(s)
- A V Akimov
- A. F. Ioffe Physical-Technical Institute, St. Petersburg, 194021 Russia
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18
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Tommaseo G, Petekidis G, Steffen W, Fytas G, Schofield AB, Stefanou N. Hypersonic acoustic excitations in binary colloidal crystals: big versus small hard sphere control. J Chem Phys 2007; 126:014707. [PMID: 17212511 DOI: 10.1063/1.2429067] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The phononic band structure of two binary colloidal crystals, at hypersonic frequencies, is studied by means of Brillouin light scattering and analyzed in conjunction with corresponding dispersion diagrams of the single colloidal crystals of the constituent particles. Besides the acoustic band of the average medium, the authors' results show the existence of narrow bands originating from resonant multipole modes of the individual particles as well as Bragg-type modes due to the (short-range) periodicity. Strong interaction, leading to the occurrence of hybridization gaps, is observed between the acoustic band and the band of quadrupole modes of the particles that occupy the largest fractional volume of the mixed crystal; the effective radius is either that of the large (in the symmetric NaCl-type crystalline phase) or the small (in the asymmetric NaZn(13)-type crystalline phase) particles. The possibility to reveal a universal behavior of the phononic band structure for different single and binary colloidal crystalline suspensions, by representing in the dispersion diagrams reduced quantities using an appropriate length scale, is discussed.
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Affiliation(s)
- G Tommaseo
- Max Planck Institute for Polymer Research, P.O. Box 3148, 55021 Mainz, Germany
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Cheng W, Gorishnyy T, Krikorian V, Fytas G, Thomas EL. In-Plane Elastic Excitations in 1D Polymeric Photonic Structures. Macromolecules 2006. [DOI: 10.1021/ma062109i] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- W. Cheng
- Max Planck Institute for Polymer Research, P.O. 3148, 55128 Mainz, Germany; Department of Materials Science and Technology, University of Crete, and FORTH, P.O. 1527, 71110 Heraklion, Greece; Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139; and Institute for Soldier Nanotechnologies, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
| | - T. Gorishnyy
- Max Planck Institute for Polymer Research, P.O. 3148, 55128 Mainz, Germany; Department of Materials Science and Technology, University of Crete, and FORTH, P.O. 1527, 71110 Heraklion, Greece; Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139; and Institute for Soldier Nanotechnologies, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
| | - V. Krikorian
- Max Planck Institute for Polymer Research, P.O. 3148, 55128 Mainz, Germany; Department of Materials Science and Technology, University of Crete, and FORTH, P.O. 1527, 71110 Heraklion, Greece; Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139; and Institute for Soldier Nanotechnologies, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
| | - G. Fytas
- Max Planck Institute for Polymer Research, P.O. 3148, 55128 Mainz, Germany; Department of Materials Science and Technology, University of Crete, and FORTH, P.O. 1527, 71110 Heraklion, Greece; Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139; and Institute for Soldier Nanotechnologies, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
| | - E. L. Thomas
- Max Planck Institute for Polymer Research, P.O. 3148, 55128 Mainz, Germany; Department of Materials Science and Technology, University of Crete, and FORTH, P.O. 1527, 71110 Heraklion, Greece; Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139; and Institute for Soldier Nanotechnologies, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
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Cheng W, Wang J, Jonas U, Fytas G, Stefanou N. Observation and tuning of hypersonic bandgaps in colloidal crystals. NATURE MATERIALS 2006; 5:830-6. [PMID: 16951677 DOI: 10.1038/nmat1727] [Citation(s) in RCA: 118] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2006] [Accepted: 08/02/2006] [Indexed: 05/09/2023]
Abstract
Composite materials with periodic variations of density and/or sound velocities, so-called phononic crystals, can exhibit bandgaps where propagation of acoustic waves is forbidden. Phononic crystals are the elastic analogue of the well-established photonic crystals and show potential for manipulating the flow of elastic energy. So far, the experimental realization of phononic crystals has been restricted to macroscopic systems with sonic or ultrasonic bandgaps in the sub-MHz frequency range. In this work, using high-resolution Brillouin spectroscopy we report the first observation of a hypersonic bandgap in face-centred-cubic colloidal crystals formed by self-assembly of polystyrene nanoparticles with subsequent fluid infiltration. Depending on the particle size and the sound velocity in the infiltrated fluid, the frequency and the width of the gap can be tuned. Promising technological applications of hypersonic crystals, ranging from tunable filters and heat management to acousto-optical devices, are anticipated.
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Affiliation(s)
- Wei Cheng
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
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