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Robbes AS, Jestin J, Meneau F, Dalmas F, Boué F, Cousin F. In Situ SAXS and SANS Monitoring of Both Nanofillers and Polymer Chain Microstructure under Uniaxial Stretching in a Nanocomposite with a Controlled Anisotropic Structure. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c00618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Anne-Sophie Robbes
- Laboratoire Léon Brillouin, CEA Saclay, 91191 Gif-sur-Yvette Cedex France
- Synchrotron SOLEIL, L’Orme des Merisiers,
P.O. Box 48, Saint-Aubin, 91192 Gif sur Yvette, France
| | - Jacques Jestin
- Laboratoire Léon Brillouin, CEA Saclay, 91191 Gif-sur-Yvette Cedex France
| | - Florian Meneau
- Synchrotron SOLEIL, L’Orme des Merisiers,
P.O. Box 48, Saint-Aubin, 91192 Gif sur Yvette, France
| | - Florent Dalmas
- Institut de Chimie et des Matériaux Paris-Est, CNRS UMR 7182, 2-8 rue Henri Dunant, 94320 Thiais France
| | - François Boué
- Laboratoire Léon Brillouin, CEA Saclay, 91191 Gif-sur-Yvette Cedex France
| | - Fabrice Cousin
- Laboratoire Léon Brillouin, CEA Saclay, 91191 Gif-sur-Yvette Cedex France
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2
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Lu RX, Huang JH, Luo MB. A simulation study on the subdiffusion of polymer chains in crowded environments containing nanoparticles. Phys Chem Chem Phys 2022; 24:3078-3085. [PMID: 35040462 DOI: 10.1039/d1cp03926a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Polymer chains in crowded environments often show subdiffusive behavior. We adopt molecular dynamics simulations to study the conditions for the subdiffusion of polymer chains in crowded environments containing randomly distributed, immobile, attractive nanoparticles (NPs). The attraction is strong enough to adsorb polymer chains on NPs. The results show that subdiffusion occurs at a low concentration of polymer chains (cp). A transition from subdiffusion to normal diffusion is observed when cp exceeds the transition concentration , which increases with increasing concentration of NPs while decreases with increasing size of NPs. The high concentration and small size of NPs exert a big effect on the subdiffusion of polymer chains. The subdiffusive behavior of polymer chains can be attributed to the strong adsorption of polymer chains on the attractive NPs. For the subdiffusion case, polymer chains are adsorbed strongly on multiple NPs, and they diffuse via the NP-exchange diffusion mechanism. However for the normal diffusion case, polymer chains are either free or weakly adsorbed on one or a few NPs, and they diffuse mainly via the adsorption-and-desorption diffusion mechanism.
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Affiliation(s)
- Rong-Xing Lu
- Department of Chemistry, Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou 310018, China.
| | - Jian-Hua Huang
- Department of Chemistry, Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou 310018, China.
| | - Meng-Bo Luo
- Department of Physics, Zhejiang University, Hangzhou 310027, China
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3
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Musino D, Oberdisse J, Farago B, Alegria A, Genix AC. Resolving Segmental Polymer Dynamics in Nanocomposites by Incoherent Neutron Spin-Echo Spectroscopy. ACS Macro Lett 2020; 9:910-916. [PMID: 35648525 DOI: 10.1021/acsmacrolett.0c00369] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The segmental dynamics of styrene-butadiene nanocomposites with embedded silica nanoparticles (NPs, ca. 20 vol. %) has been studied by broadband dielectric (BDS) and neutron spin-echo spectroscopy (NSE). It is shown by BDS that overlapping contributions only allow us to conclude on a range of distributions of relaxation times in simplified industrial nanocomposites formed with highly polydisperse NPs. For comparison, structurally similar but less aggregated colloidal nanocomposites have a well-defined distribution of relaxation times due to the reduced influence of interfacial polarization processes. This distribution is widened with respect to the neat polymer, without change in the position of the maximum and at most a small slowing down visible in the average time. We then demonstrate that incoherent NSE can be used to resolve small modifications of segmental dynamics of the industrial samples. By carefully choosing the q-vector of the measurement, experiments with fully hydrogenated polymer give access to the self-dynamics of the polymer in the presence of silica on the scale of approximately 1 nm. Our high-resolution measurements show that the segmental motion is slightly but systematically slowed also by the presence of the industrial filler NPs.
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Affiliation(s)
- Dafne Musino
- Laboratoire Charles Coulomb (L2C), Université de Montpellier, CNRS, F-34095 Montpellier, France
| | - Julian Oberdisse
- Laboratoire Charles Coulomb (L2C), Université de Montpellier, CNRS, F-34095 Montpellier, France
| | - Bela Farago
- Institut Max von Laue-Paul Langevin (ILL), 71 Avenue des Martyrs, CS 20156, F-38042 Cedex 9 Grenoble, France
| | - Angel Alegria
- Departamento de Fisica de Materiales (UPV/EHU), Materials Physics Center (CSIC-UPV/EHU), Paseo Manuel Lardizábal 5, San Sebastian 20018, Spain
| | - Anne-Caroline Genix
- Laboratoire Charles Coulomb (L2C), Université de Montpellier, CNRS, F-34095 Montpellier, France
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Genix AC, Bocharova V, Carroll B, Lehmann M, Saito T, Krueger S, He L, Dieudonné-George P, Sokolov AP, Oberdisse J. Understanding the Static Interfacial Polymer Layer by Exploring the Dispersion States of Nanocomposites. ACS Appl Mater Interfaces 2019; 11:17863-17872. [PMID: 31009193 PMCID: PMC6998785 DOI: 10.1021/acsami.9b04553] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The dynamic and static properties of the interfacial region between polymer and nanoparticles have wide-ranging consequences on performances of nanomaterials. The thickness and density of the static layer are particularly difficult to assess experimentally due to superimposing nanoparticle interactions. Here, we tune the dispersion of silica nanoparticles in nanocomposites by preadsorption of polymer layers in the precursor solutions, and by varying the molecular weight of the matrix chains. Nanocomposite structures ranging from ideal dispersion to repulsive order or various degrees of aggregation are generated and observed by small-angle scattering. Preadsorbed chains are found to promote ideal dispersion, before desorption in the late stages of nanocomposite formation. The microstructure of the interfacial polymer layer is characterized by detailed modeling of X-ray and neutron scattering. Only in ideally well-dispersed systems a static interfacial layer of reduced polymer density over a thickness of ca. 2 nm is evidenced based on the analysis with a form-free density profile optimized using numerical simulations. This interfacial gradient layer is found to be independent of the thickness of the initially adsorbed polymer, but appears to be generated by out-of-equilibrium packing and folding of the preadsorbed layer. The impact of annealing is investigated to study the approach of equilibrium, showing that initially ideally well-dispersed systems adopt a repulsive hard-sphere structure, while the static interfacial layer disappears. This study thus promotes the fundamental understanding of the interplay between effects which are decisive for macroscopic material properties: polymer-mediated interparticle interactions, and particle interfacial effects on the surrounding polymer.
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Affiliation(s)
- Anne-Caroline Genix
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
- Laboratoire Charles Coulomb (L2C), Université de Montpellier, CNRS, F-34095 Montpellier, France
| | - Vera Bocharova
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Bobby Carroll
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Michelle Lehmann
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
- The Bredesen Center for Interdisciplinary Research and Graduate Education, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Tomonori Saito
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
- The Bredesen Center for Interdisciplinary Research and Graduate Education, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Susan Krueger
- NIST Center for Neutron Research, NIST, Gaithersburg, Maryland 20899, United States
| | - Lilin He
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | | | - Alexei P. Sokolov
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Julian Oberdisse
- Laboratoire Charles Coulomb (L2C), Université de Montpellier, CNRS, F-34095 Montpellier, France
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5
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Abstract
In this study we have assessed, using dielectric relaxation spectroscopy (DRS), the confinement effects of the more mobile chain in partially miscible polymeric blends of PS/PVME (polystyrene/poly(vinyl methyl ether)) in the presence of anisotropically shaped MWCNTs (multiwalled carbon nanotubes). To understand if this confinement effect is very specific to MWCNTs, the characteristic dimensions of which are often close to the radius of gyration of the polymeric chains, a few other particles like spherical silver, stacked clay tactoids and platy graphene sheets at similar weight fractions were also incorporated and systematically studied. The DRS studies reveal that the more mobile chain (here PVME) experiences possibly two different environments in the presence of frozen PS and more importantly in the presence of MWCNTs at temperatures close to and not so far from the blend Tg. The presence of bimodal relaxations with a weak temperature independent faster relaxation in the blends is composition dependent (PS rich blends). Assuming that there are no chemical interactions of PVME with the particles, these confinement effects seem to be very specific to MWCNTs as the bimodal relaxations were completely absent in the case of other nanoparticles. In the case of polymer blends, when two different chains are brought together, a loss in the deformational entropy is expected due to the excluded volume interaction and chain connectivity effects. In the presence of nanoparticles, especially MWCNTs, the polymer coils are subjected to perturbation leading to entropic loss in the system, which determine the miscibility in the blends. The configurational entropy near glass transition was assessed to understand the improved miscibility due to MWCNTs in this particular blend. The length of cooperativity suggests a cooperative motion of PS and PVME over shorter length scales in the case of MWCNTs as compared to other particles. This also hints at perturbed PVME motion in the network of MWCNTs. Taken together, our study reveals that the kinetic PVME arrest results in two different environments and is dependent on the effective concentration of MWCNTs in the blends.
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Affiliation(s)
- Priti Xavier
- Department of Materials Engineering, Indian Institute of Science, Bangalore-560012, India.
| | - Keerthi M Nair
- Indian Institute of Science Education and Research, Thiruvananthapuram-695016, India
| | - Lasitha K
- Department of Materials Engineering, Indian Institute of Science, Bangalore-560012, India.
| | - Suryasarathi Bose
- Department of Materials Engineering, Indian Institute of Science, Bangalore-560012, India.
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Poling-Skutvik R, Mongcopa KIS, Faraone A, Narayanan S, Conrad JC, Krishnamoorti R. Structure and Dynamics of Interacting Nanoparticles in Semidilute Polymer Solutions. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b01277] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
| | | | - Antonio Faraone
- National Institute
of Standards and Technology Center for Neutron Research, Gaithersburg, Maryland 20899, United States
| | - Suresh Narayanan
- Advanced
Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, United States
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7
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Weir MP, Johnson DW, Boothroyd SC, Savage RC, Thompson RL, King SM, Rogers SE, Coleman KS, Clarke N. Distortion of Chain Conformation and Reduced Entanglement in Polymer-Graphene Oxide Nanocomposites. ACS Macro Lett 2016; 5:430-434. [PMID: 35607237 DOI: 10.1021/acsmacrolett.6b00100] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We study the conformations of polymer chains in polymer-graphene oxide nanocomposites. We show that the chains have a reduced radius of gyration that is consistent with confinement at a solid interface in the melt, as is expected for well-dispersed, high aspect ratio nanoparticles that are much larger than the polymer coil size. We show that confinement of the polymer chains causes a corresponding reduction in interchain entanglements, and we calculate a contribution to the plateau modulus from the distorted polymer network via a simple scaling argument. Our results are a significant step forward in understanding how two-dimensional nanoparticles affect global material properties at low loadings.
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Affiliation(s)
- M. P. Weir
- Department
of Physics and Astronomy, The University of Sheffield, Hicks Building,
Hounsfield Road, Sheffield S3 7RH, United Kingdom
| | - D. W. Johnson
- Department
of Chemistry, University of Durham, Durham DH1 3LE, United Kingdom
| | - S. C. Boothroyd
- Department
of Chemistry, University of Durham, Durham DH1 3LE, United Kingdom
| | - R. C. Savage
- Department
of Physics and Astronomy, The University of Sheffield, Hicks Building,
Hounsfield Road, Sheffield S3 7RH, United Kingdom
| | - R. L. Thompson
- Department
of Chemistry, University of Durham, Durham DH1 3LE, United Kingdom
| | - S. M. King
- ISIS
Pulsed Neutron and Muon Source, Science and Technology Facilities
Council, Rutherford Appleton Laboratory, Harwell, Oxford, Didcot OX11 0QX, United Kingdom
| | - S. E. Rogers
- ISIS
Pulsed Neutron and Muon Source, Science and Technology Facilities
Council, Rutherford Appleton Laboratory, Harwell, Oxford, Didcot OX11 0QX, United Kingdom
| | - K. S. Coleman
- Department
of Chemistry, University of Durham, Durham DH1 3LE, United Kingdom
| | - N. Clarke
- Department
of Physics and Astronomy, The University of Sheffield, Hicks Building,
Hounsfield Road, Sheffield S3 7RH, United Kingdom
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Affiliation(s)
- Priti Xavier
- Department
of Materials Engineering, Indian Institute of Science, Bangalore 560012, India
| | - Suryasarathi Bose
- Department
of Materials Engineering, Indian Institute of Science, Bangalore 560012, India
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9
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Xavier P, Rao P, Bose S. Nanoparticle induced miscibility in LCST polymer blends: critically assessing the enthalpic and entropic effects. Phys Chem Chem Phys 2016; 18:47-64. [DOI: 10.1039/c5cp05852j] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The use of polymer blends widened the possibility of creating materials with multilayered architectures.
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Affiliation(s)
- Priti Xavier
- Department of Materials Engineering
- Indian Institute of Science
- Bangalore-560012
- India
| | - Praveen Rao
- Department of Materials Engineering
- Indian Institute of Science
- Bangalore-560012
- India
| | - Suryasarathi Bose
- Department of Materials Engineering
- Indian Institute of Science
- Bangalore-560012
- India
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10
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Jiang N, Endoh MK, Koga T, Masui T, Kishimoto H, Nagao M, Satija SK, Taniguchi T. Nanostructures and Dynamics of Macromolecules Bound to Attractive Filler Surfaces. ACS Macro Lett 2015; 4:838-842. [PMID: 35596506 DOI: 10.1021/acsmacrolett.5b00368] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report in situ nanostructures and dynamics of polybutadiene (PB) chains bound to carbon black (CB) fillers (the so-called "bound polymer layer (BPL)") in a good solvent. The BPL on the CB fillers was extracted by solvent leaching of a CB-filled PB compound and subsequently dispersed in deuterated toluene to label the BPL for small-angle neutron scattering and neutron spin echo techniques. The results demonstrate that the BPL is composed of two regions regardless of molecular weights of PB: the inner unswollen region of ≈ 0.5 nm thick and outer swollen region where the polymer chains display a parabolic profile with a diffuse tail. In addition, the results show that the dynamics of the swollen bound chains can be explained by the so-called "breathing mode" and is generalized with the thickness of the swollen BPL.
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Affiliation(s)
| | | | | | - Tomomi Masui
- Sumitomo
Rubber
Industries Ltd., 1-1, 2-chome, Tsutsui-cho, Chuo-ku, Kobe, 671-0027, Japan
| | - Hiroyuki Kishimoto
- Sumitomo
Rubber
Industries Ltd., 1-1, 2-chome, Tsutsui-cho, Chuo-ku, Kobe, 671-0027, Japan
| | - Michihiro Nagao
- NIST
Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, United States
- Center for
Exploration of Energy and Matter, Indiana University, Bloomington, Indiana 47408, United States
| | - Sushil K. Satija
- NIST
Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, United States
| | - Takashi Taniguchi
- Graduate
School of Engineering, Department of Chemical Engineering, Kyoto University, Katsura-Campus, Nishikyo-ku, Kyoto, 615-8510, Japan
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Genix A, Oberdisse J. Structure and dynamics of polymer nanocomposites studied by X-ray and neutron scattering techniques. Curr Opin Colloid Interface Sci 2015; 20:293-303. [DOI: 10.1016/j.cocis.2015.10.002] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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12
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Xavier P, Bose S. Mapping the intriguing transient morphologies and the demixing behavior in PS/PVME blends in the presence of rod-like nanoparticles. Phys Chem Chem Phys 2015; 17:14972-85. [PMID: 25982342 DOI: 10.1039/c5cp01865j] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The demixing behavior, transient morphologies and mechanism of phase separation in PS/PVME blends were greatly altered in the presence of a very low concentration of rod-like particles (multiwall carbon nanotubes, MWNTs). This phenomenon is due to the specific interaction of one of the phases (PVME) with the anisotropic MWNTs, which creates a heterogeneous environment in the blend. This specific interaction alters the chain dynamics in the interfacial region as against the bulk. A comprehensive analysis using isochronal temperature sweep was performed to understand the demixing temperature in the blends. The evolution of phase morphology as a function of time and temperature was assessed by polarizing optical microscopy (POM), atomic force microscopy (AFM) and scanning electron microscopy (SEM). The addition of MWNTs increased the rheological demixing temperature and the spinodal temperature in almost all the compositions. The intriguing transient morphologies were mapped, which varied from nucleation and growth to coalescence-induced viscoelastic phase separation (C-VPS) in PVME-rich blends, to spinodal decomposition in the near-critical compositions, to transient gel-induced VPS (T-VPS) in the PS-rich compositions. Mapping of the morphology development displayed two types of fracture mechanisms: ductile fracture for near-critical compositions and brittle fracture for off-critical composition. The change in the phase separation mechanism in the presence of MWNTs was due to the variation in dynamic asymmetry brought about by these anisotropic particles. All these observations were correlated by POM, SEM and AFM studies. The length of the cooperatively rearranging region (CRR), as evaluated using modulated differential scanning calorimetry (MDSC) measurements, was found to be composition-independent. The observed variation of effective glass transition of PVME (low Tg component) on blending with PS (high Tg component) and by the addition of MWNTs accounts for the dynamic heterogeneity introduced by MWNTs in the system.
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Affiliation(s)
- Priti Xavier
- Department of Materials Engineering, Indian Institute of Science, Bangalore-560012, India.
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13
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Jiang H, Liu JK, Wang JD, Lu Y, Yang XH. Thermal perturbation nucleation and growth of silver molybdate nanoclusters by a dynamic template route. CrystEngComm 2015. [DOI: 10.1039/c5ce00039d] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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