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Sharma K, Costa NL, Kim YA, Muramatsu H, Barbosa Neto NM, Martins LGP, Kong J, Paschoal AR, Araujo PT. Sharma et al. Reply. PHYSICAL REVIEW LETTERS 2022; 128:219602. [PMID: 35687441 DOI: 10.1103/physrevlett.128.219602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Accepted: 04/19/2022] [Indexed: 06/15/2023]
Affiliation(s)
- Keshav Sharma
- Department of Physics and Astronomy, University of Alabama, Tuscaloosa, 35487 Alabama, USA
| | - Nathalia L Costa
- Department of Physics, Federal University of Ceara, Fortaleza, 60455-760 Ceara, Brazil
| | - Yoong Ahm Kim
- Department of Polymer Engineering, School of Polymer Science and Engineering, and Alan G. MacDiarmid Energy Research Institute, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju, 61186, Republic of Korea
| | - Hiroyuki Muramatsu
- Research Institute for Supra-Materials, Shinshu University, 4-17-1 Wakasato, 380-8553 Nagano, Japan
| | - Newton M Barbosa Neto
- Institute of Natural Sciences, Graduate Program in Physics, Federal University of Para, Belem 66075-110, Brazil
| | - Luiz G P Martins
- Department of Physics, Massachusetts Institute of Technology, Cambridge 02139, Massachusetts, USA
| | - Jing Kong
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge 02139, Massachusetts, USA
| | | | - Paulo T Araujo
- Department of Physics and Astronomy, University of Alabama, Tuscaloosa, 35487 Alabama, USA
- Institute of Natural Sciences, Graduate Program in Physics, Federal University of Para, Belem 66075-110, Brazil
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2
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Lee JY, Lee C, Osawa E, Choi JW, Sur JC, Lee KH. Snapshots of the Fragmentation for C 70@Single-Walled Carbon Nanotube: Tight-Binding Molecular Dynamics Simulations. Int J Mol Sci 2021; 22:ijms22083929. [PMID: 33920291 PMCID: PMC8069131 DOI: 10.3390/ijms22083929] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Revised: 04/05/2021] [Accepted: 04/06/2021] [Indexed: 11/24/2022] Open
Abstract
In previously reported experimental studies, a yield of double-walled carbon nanotubes (DWCNTs) at C70@Single-walled carbon nanotubes (SWCNTs) is higher than C60@SWCNTs due to the higher sensitivity to photolysis of the former. From the perspective of pyrolysis dynamics, we would like to understand whether C70@SWCNT is more sensitive to thermal decomposition than C60@SWCNT, and the starting point of DWCNT formation, which can be obtained through the decomposition fragmentation of the nanopeapods, which appears in the early stages. We have studied the fragmentation of C70@SWCNT nanopeapods, using molecular dynamics simulations together with the empirical tight-binding total energy calculation method. We got the snapshots of the fragmentation structure of carbon nano-peapods (CNPs) composed of SWCNT and C70 fullerene molecules and the geometric spatial positioning structure of C70 within the SWCNT as a function of dynamics time (for 2 picoseconds) at the temperatures of 4000 K, 5000 K, and 6000 K. In conclusion, the scenario in which C70@SWCNT transforms to a DWCNT would be followed by the fragmentation of C70, after C70, and the SWCNT have been chemically bonding in the early stages. The relative stability of fullerenes in CNPs could be reversed, compared to the ranking of the relative stability of the encapsulated molecules themselves.
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Affiliation(s)
- Ji Young Lee
- Department of Chemistry, Nanoscale Sciences and Technology Institute, Wonkwang University, Iksan, Jeonbuk 54538, Korea;
| | - Changhoon Lee
- Max Planck POSTECH Center for Complex Phase of Materials, Pohang University of Science and Technology, Pohang 37673, Korea
- Correspondence: (C.L.); (J.W.C.); (J.C.S.); (K.H.L.)
| | - Eiji Osawa
- Nanocarbon Research Institute, Shinshu University, Ueda, Nagano 386-8567, Japan;
| | - Jong Woan Choi
- Department of Semiconductor and Display, Wonkwang University, Iksan 54538, Korea
- Correspondence: (C.L.); (J.W.C.); (J.C.S.); (K.H.L.)
| | - Jung Chul Sur
- Department of Semiconductor and Display, Wonkwang University, Iksan 54538, Korea
- Correspondence: (C.L.); (J.W.C.); (J.C.S.); (K.H.L.)
| | - Kee Hag Lee
- Department of Chemistry, Nanoscale Sciences and Technology Institute, Wonkwang University, Iksan, Jeonbuk 54538, Korea;
- Correspondence: (C.L.); (J.W.C.); (J.C.S.); (K.H.L.)
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3
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Costa NL, Sharma K, Kim YA, Choi GB, Endo M, Barbosa Neto NM, Paschoal AR, Araujo PT. Thermodynamics of Linear Carbon Chains. PHYSICAL REVIEW LETTERS 2021; 126:125901. [PMID: 33834836 DOI: 10.1103/physrevlett.126.125901] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Revised: 01/18/2021] [Accepted: 02/08/2021] [Indexed: 06/12/2023]
Abstract
Linear carbon chains (LCCs) are one-dimensional materials with unique properties, including high Debye temperatures and restricted selection rules for phonon interactions. Consequently, their Raman C-band frequency's temperature dependence is a probe to their thermal properties, which are well described within the Debye formalism even at room temperatures. Therefore, with the basis on a semiempirical approach we show how to use the C band to evaluate the LCCs' internal energy, heat capacity, coefficient of thermal expansion, thermal strain, and Grüneisen parameter, providing universal relations for these quantities in terms of the number of carbons atoms and the temperature.
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Affiliation(s)
- Nathalia L Costa
- Department of Physics, Federal University of Ceara, 60455-760 Fortaleza, Ceara, Brazil
| | - Keshav Sharma
- Department of Physics and Astronomy, University of Alabama, Tuscaloosa, Alabama 35487, USA
| | - Yoong Ahm Kim
- Department of Polymer Engineering, School of Polymer Science and Engineering, and Alan G. MacDiarmid Energy Research Institute, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea
| | - Go Bong Choi
- Department of Polymer Engineering, School of Polymer Science and Engineering, and Alan G. MacDiarmid Energy Research Institute, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea
| | - Morinobu Endo
- Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano-shi 380-8553, Japan
| | - Newton M Barbosa Neto
- Institute of Natural Sciences, Graduate Program in Physics, Federal University of Para, 66075-110 Belem, PA, Brazil
| | - Alexandre R Paschoal
- Department of Physics, Federal University of Ceara, 60455-760 Fortaleza, Ceara, Brazil
| | - Paulo T Araujo
- Department of Physics and Astronomy, University of Alabama, Tuscaloosa, Alabama 35487, USA
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4
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Sharma K, Costa NL, Kim YA, Muramatsu H, Barbosa Neto NM, Martins LGP, Kong J, Paschoal AR, Araujo PT. Anharmonicity and Universal Response of Linear Carbon Chain Mechanical Properties under Hydrostatic Pressure. PHYSICAL REVIEW LETTERS 2020; 125:105501. [PMID: 32955330 DOI: 10.1103/physrevlett.125.105501] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Accepted: 07/23/2020] [Indexed: 06/11/2023]
Abstract
Isolated linear carbon chains (LCCs) encapsulated by multiwalled carbon nanotubes are studied under hydrostatic pressure (P) via resonance Raman scattering. The LCCs' spectroscopic signature C band around 1850 cm^{-1} softens linearly with increasing P. A simple anharmonic force-constant model not only describes such softening but also shows that the LCCs' Young's modulus (E), Grüneisen parameter (γ), and strain (ϵ) follow universal P^{-1} and P^{2} laws, respectively. In particular, γ also presents a unified behavior for all LCCs. To the best of our knowledge, these are the first results reported on such isolated systems and the first work to explore universal P-dependent responses for LCCs' E, ϵ, and γ.
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Affiliation(s)
- Keshav Sharma
- Department of Physics and Astronomy, University of Alabama, Tuscaloosa, Alabama 35487, USA
| | - Nathalia L Costa
- Department of Physics, Federal University of Ceara, 60455-760 Fortaleza, Ceara, Brazil
| | - Yoong Ahm Kim
- Department of Polymer Engineering, School of Polymer Science and Engineering, and Alan G. MacDiarmid Energy Research Institute, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea
| | - Hiroyuki Muramatsu
- Research Institute for Supra-Materials, Shinshu University 4-17-1 Wakasato, Nagano, Japan
| | - Newton M Barbosa Neto
- Institute of Natural Sciences, Graduate Program in Physics, Federal University of Para, 66075-110 Belem, PA, Brazil
| | - Luiz G P Martins
- Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Jing Kong
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | | | - Paulo T Araujo
- Department of Physics and Astronomy, University of Alabama, Tuscaloosa, Alabama 35487, USA
- Institute of Natural Sciences, Graduate Program in Physics, Federal University of Para, 66075-110 Belem, PA, Brazil
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5
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Sohrabi-Mahboub M, Farrokhpour H. The dependence of the size of confined water fluid molecules on the radius of carbon nanotube. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.07.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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6
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Djikaev YS, Ruckenstein E. Temperature dependence of the evaporation lengthscale for water confined between two hydrophobic plates. J Colloid Interface Sci 2015; 449:226-35. [PMID: 25708521 DOI: 10.1016/j.jcis.2015.01.052] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Accepted: 01/20/2015] [Indexed: 11/20/2022]
Abstract
Liquid water in a hydrophobic confinement is the object of high interest in physicochemical sciences. Confined between two macroscopic hydrophobic surfaces, liquid water transforms into vapor if the distance between surfaces is smaller than a critical separation, referred to as the evaporation lengthscale. To investigate the temperature dependence of the evaporation lengthscale of water confined between two hydrophobic parallel plates, we use the combination of the density functional theory (DFT) with the probabilistic hydrogen bond (PHB) model for water-water hydrogen bonding. The PHB model provides an analytic expression for the average number of hydrogen bonds per water molecule as a function of its distance to a hydrophobic surface and its curvature. Knowing this expression, one can implement the effect of hydrogen bonding between water molecules on their interaction with the hydrophobe into DFT, which is then employed to determine the distribution of water molecules between two macroscopic hydrophobic plates at various interplate distances and various temperatures. For water confined between hydrophobic plates, our results suggest the evaporation lengthscale to be of the order of several nanometers and a linearly increasing function of temperature from T=293 K to T=333 K, qualitatively consistent with previous results.
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Affiliation(s)
- Yuri S Djikaev
- Department of Chemical and Biological Engineering, SUNY at Buffalo, Buffalo, NY 14260, United States.
| | - Eli Ruckenstein
- Department of Chemical and Biological Engineering, SUNY at Buffalo, Buffalo, NY 14260, United States.
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Bommel S, Kleppmann N, Weber C, Spranger H, Schäfer P, Novak J, Roth S, Schreiber F, Klapp S, Kowarik S. Unravelling the multilayer growth of the fullerene C60 in real time. Nat Commun 2014; 5:5388. [PMID: 25369851 PMCID: PMC4272254 DOI: 10.1038/ncomms6388] [Citation(s) in RCA: 72] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2014] [Accepted: 09/26/2014] [Indexed: 11/18/2022] Open
Abstract
Molecular semiconductors are increasingly used in devices, but understanding of elementary nanoscopic processes in molecular film growth is in its infancy. Here we use real-time in situ specular and diffuse X-ray scattering in combination with kinetic Monte Carlo simulations to study C60 nucleation and multilayer growth. We determine a self-consistent set of energy parameters describing both intra- and interlayer diffusion processes in C60 growth. This approach yields an effective Ehrlich-Schwoebel barrier of EES=110 meV, diffusion barrier of ED=540 meV and binding energy of EB=130 meV. Analysing the particle-resolved dynamics, we find that the lateral diffusion is similar to colloids, but characterized by an atom-like Schwoebel barrier. Our results contribute to a fundamental understanding of molecular growth processes in a system, which forms an important intermediate case between atoms and colloids.
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Affiliation(s)
- S. Bommel
- Institut für Physik, Humboldt-Universität zu
Berlin, Newtonstrasse 15, 12489
Berlin, Germany
- Deutsches Elektronen-Synchrotron (DESY), Notkestrasse
85, 22607
Hamburg, Germany
| | - N. Kleppmann
- Institut für Theoretische Physik, Technische Universität
Berlin, Hardenbergstrasse 36, 10623
Berlin, Germany
| | - C. Weber
- Institut für Physik, Humboldt-Universität zu
Berlin, Newtonstrasse 15, 12489
Berlin, Germany
| | - H. Spranger
- Institut für Physik, Humboldt-Universität zu
Berlin, Newtonstrasse 15, 12489
Berlin, Germany
| | - P. Schäfer
- Institut für Physik, Humboldt-Universität zu
Berlin, Newtonstrasse 15, 12489
Berlin, Germany
| | - J. Novak
- Institut für Angewandte Physik, Universität
Tübingen, Auf der Morgenstelle 10, 72076
Tübingen, Germany
| | - S.V. Roth
- Deutsches Elektronen-Synchrotron (DESY), Notkestrasse
85, 22607
Hamburg, Germany
| | - F. Schreiber
- Institut für Angewandte Physik, Universität
Tübingen, Auf der Morgenstelle 10, 72076
Tübingen, Germany
| | - S.H.L. Klapp
- Institut für Theoretische Physik, Technische Universität
Berlin, Hardenbergstrasse 36, 10623
Berlin, Germany
| | - S. Kowarik
- Institut für Physik, Humboldt-Universität zu
Berlin, Newtonstrasse 15, 12489
Berlin, Germany
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8
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Electrons for single molecule diffraction and imaging. Ultramicroscopy 2012; 119:72-7. [PMID: 22244495 DOI: 10.1016/j.ultramic.2011.11.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2011] [Revised: 11/05/2011] [Accepted: 11/14/2011] [Indexed: 11/24/2022]
Abstract
We demonstrate the potential of electrons for single molecule diffraction and imaging using C₆₀ molecules confined inside single-walled carbon nanotubes (C₆₀s@SWCNT or peapod) as a model system. A 25 nm diameter electron beam from a field emission gun source is used to record diffraction patterns from individual peapods using imaging plates. The electron beam illuminates about 25 C₆₀ molecules. Experimentally, we found that the molecules diffract inside ∼15% of the host nanotubes. With the help of simulations, we explore the limits of electron molecular diffraction and its sensitivity to the molecular configurations. We show that the combination of electron diffraction and electron direct imaging provides the best approach to single molecule imaging.
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9
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Kyakuno H, Matsuda K, Yahiro H, Inami Y, Fukuoka T, Miyata Y, Yanagi K, Maniwa Y, Kataura H, Saito T, Yumura M, Iijima S. Confined water inside single-walled carbon nanotubes: Global phase diagram and effect of finite length. J Chem Phys 2011; 134:244501. [DOI: 10.1063/1.3593064] [Citation(s) in RCA: 117] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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10
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Verberck B. Symmetry-adapted rotator functions for molecules in cylindrical confinement. Int J Mol Sci 2011; 12:317-33. [PMID: 21339988 PMCID: PMC3039954 DOI: 10.3390/ijms12010317] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2010] [Revised: 01/07/2011] [Accepted: 01/12/2011] [Indexed: 11/17/2022] Open
Abstract
We present a general description of the formalism of symmetry-adapted rotator functions (SARFs) for molecules in cylindrical confinement. Molecules are considered as clusters of interaction centers (ICs), can have any symmetry, and can display different types of ICs. Cylindrical confinement can be realized by encapsulation in a carbon nanotube (CNT). The potential energy of a molecule surrounded by a CNT can be calculated by evaluating a limited number of terms of an expansion into SARFs, which offers a significant reduction of the computation time. Optimal molecular orientations can be deduced from the resulting potential energy landscape. Examples, including the case of a molecule with cubic symmetry inside a CNT, are discussed.
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Affiliation(s)
- Bart Verberck
- Departement Fysica, Universiteit Antwerpen, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium; E-Mail:
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11
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Zou Y, Liu B, Wang L, Liu D, Yu S, Wang P, Wang T, Yao M, Li Q, Zou B, Cui T, Zou G, Wågberg T, Sundqvist B, Mao HK. Rotational dynamics of confined C60 from near-infrared Raman studies under high pressure. Proc Natl Acad Sci U S A 2009; 106:22135-8. [PMID: 20018752 PMCID: PMC2799708 DOI: 10.1073/pnas.0911963106] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2009] [Indexed: 11/18/2022] Open
Abstract
Peapods present a model system for studying the properties of dimensionally constrained crystal structures, whose dynamical properties are very important. We have recently studied the rotational dynamics of C(60) molecules confined inside single walled carbon nanotube (SWNT) by analyzing the intermediate frequency mode lattice vibrations using near-infrared Raman spectroscopy. The rotation of C(60) was tuned to a known state by applying high pressure, at which condition C(60) first forms dimers at low pressure and then forms a single-chain, nonrotating, polymer structure at high pressure. In the latter state the molecules form chains with a 2-fold symmetry. We propose that the C(60) molecules in SWNT exhibit an unusual type of ratcheted rotation due to the interaction between C(60) and SWNT in the "hexagon orientation," and the characteristic vibrations of ratcheted rotation becomes more obvious with decreasing temperature.
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Affiliation(s)
- Yonggang Zou
- State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
| | - Bingbing Liu
- State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
| | - Liancheng Wang
- State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
| | - Dedi Liu
- State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
| | - Shidan Yu
- State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
| | - Peng Wang
- State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
| | - Tianyi Wang
- State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
| | - Mingguang Yao
- State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
| | - Quanjun Li
- State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
| | - Bo Zou
- State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
| | - Tian Cui
- State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
| | - Guangtian Zou
- State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
| | - Thomas Wågberg
- Department of Physics, Umeå University, S-90187 Umeå, Sweden; and
| | - Bertil Sundqvist
- Department of Physics, Umeå University, S-90187 Umeå, Sweden; and
| | - Ho-Kwang Mao
- State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
- Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015
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12
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Abou-Hamad E, Kim Y, Wågberg T, Boesch D, Aloni S, Zettl A, Rubio A, Luzzi DE, Goze-Bac C. Molecular dynamics and phase transition in one-dimensional crystal of C(60) encapsulated inside single wall carbon nanotubes. ACS NANO 2009; 3:3878-3883. [PMID: 19911833 DOI: 10.1021/nn901128t] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Affiliation(s)
- E Abou-Hamad
- Laboratoire Colloides, Verres et Nanomateriaux, CNRS Universite Montpellier 2, France
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13
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Neusius T, Sokolov IM, Smith JC. Subdiffusion in time-averaged, confined random walks. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2009; 80:011109. [PMID: 19658655 DOI: 10.1103/physreve.80.011109] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2008] [Revised: 05/20/2009] [Indexed: 05/28/2023]
Abstract
Certain techniques characterizing diffusive processes, such as single-particle tracking or molecular dynamics simulation, provide time averages rather than ensemble averages. Whereas the ensemble-averaged mean-squared displacement (MSD) of an unbounded continuous time random walk (CTRW) with a broad distribution of waiting times exhibits subdiffusion, the time-averaged MSD, delta2, does not. We demonstrate that, in contrast to the unbounded CTRW, in which delta2 is linear in the lag time Delta, the time-averaged MSD of the CTRW of a walker confined to a finite volume is sublinear in Delta, i.e., for long lag times delta2 approximately Delta1-alpha. The present results permit the application of CTRW to interpret time-averaged experimental quantities.
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Affiliation(s)
- Thomas Neusius
- Computational Molecular Biophysics, Universität Heidelberg, Im Neuenheimer Feld 368, D-69120 Heidelberg, Germany
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14
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Mikami F, Matsuda K, Kataura H, Maniwa Y. Dielectric properties of water inside single-walled carbon nanotubes. ACS NANO 2009; 3:1279-1287. [PMID: 19385604 DOI: 10.1021/nn900221t] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
In this paper, we report novel ferroelectric properties of a new form of ice inside single-walled carbon nanotubes (SWCNTs). These are called "ice nanotubes" (ice NTs) and they consist of polygonal water rings stacked one-dimensionally along the SWCNT axis. We performed molecular dynamics (MD) calculations for the ice NTs under an external electric field and in a temperature range between 100 and 350 K. It is revealed that ice NTs show stepwise polarization with a significant hysteresis loop as a function of the external field strength. In particular, pentagonal and heptagonal ice NTs are found to be the world's smallest ferroelectrics with spontaneous polarization of around 1 microC/cm(2). The n-gonal ice NT, where n = 5, 6, or 7, has (n + 1)-polarized structures with different polarizations. These findings suggest potential applications of SWCNTs encapsulating dielectric materials for the fabrication of the smallest ferroelectric devices. Experimental evidence for the presence of ice NTs inside SWCNTs is also discussed in great detail.
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Affiliation(s)
- Fuminori Mikami
- Department of Physics, Faculty of Science, Tokyo Metropolitan University, 1-1 Minami-osawa, Hachioji, Tokyo 192-0397, Japan
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15
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Larese JZ, Arnold T, Barbour A, Frazier LR. Neutron investigations of rotational motions in monolayer and multilayer films at the interface of MgO and graphite surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:4078-4083. [PMID: 19714830 DOI: 10.1021/la802929b] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Recent experimental investigations of the rotational motion of methane and molecular hydrogen using inelastic neutron scattering (INS) measurements in combination with thermodynamic techniques have provided a unique view of the evolution of the interaction of these two molecules with the MgO (100) surface and graphite basal plane. Despite significant differences in the chemical and physical properties and surface symmetry of these two adsorbents, the dynamical behavior of the adsorbed films is remarkably similar. The interaction of a CH4 monolayer solid with MgO and graphite, as monitored by the behavior of the J = 0 --> J = 1 free rotor transition, is so strong that there is no evidence for unhindered rotation of the molecule below 20 K. Using this same transition as a probe, H2 monolayer solids exhibit nearly free or significantly hindered motion on graphite and MgO (100) surfaces, respectively. Investigations of CH4 and H2 multilayer films on MgO find that once the film thickness exceeds approximately 3 layers, the molecule-molecule interactions predominantly determine the dynamical properties of the molecular film furthest from the surface. INS signals indicate that the dynamical motion in thicker films is closely related to that observed in the bulk system. The results of these studies serve as a valuable pathway for developing a qualitatively accurate description of the potential energy surfaces that govern the microscopic properties of these systems.
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Affiliation(s)
- J Z Larese
- Chemistry Department, University of Tennessee, Knoxville, Tennessee 37996, USA.
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