1
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Shahrokhinia A, Scanga RA, Biswas P, Reuther JF. PhotoATRP-Induced Self-Assembly (PhotoATR-PISA) Enables Simplified Synthesis of Responsive Polymer Nanoparticles in One-Pot. Macromolecules 2021. [DOI: 10.1021/acs.macromol.0c02106] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Ali Shahrokhinia
- Department of Chemistry, University of Massachusetts Lowell, Lowell, Massachusetts 01854, United States
| | - Randall A. Scanga
- Department of Chemistry, University of Massachusetts Lowell, Lowell, Massachusetts 01854, United States
| | - Priyanka Biswas
- Department of Chemistry, University of Massachusetts Lowell, Lowell, Massachusetts 01854, United States
| | - James F. Reuther
- Department of Chemistry, University of Massachusetts Lowell, Lowell, Massachusetts 01854, United States
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2
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Boonsomwong K, Genix AC, Chauveau E, Fromental JM, Dieudonné-George P, Sirisinha C, Oberdisse J. Rejuvenating the structure and rheological properties of silica nanocomposites based on natural rubber. POLYMER 2020. [DOI: 10.1016/j.polymer.2020.122168] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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3
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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 APPLIED MATERIALS & 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] [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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4
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Wen X, Su Y, Shui Y, Zhao W, Müller AJ, Wang D. Correlation between Grafting Density and Confined Crystallization Behavior of Poly(ethylene glycol) Grafted to Silica. Macromolecules 2019. [DOI: 10.1021/acs.macromol.8b02007] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Xiangning Wen
- Key Laboratory of Engineering Plastics, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of
Chinese Academy of Sciences, Beijing 100049, China
| | - Yunlan Su
- Key Laboratory of Engineering Plastics, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of
Chinese Academy of Sciences, Beijing 100049, China
| | - Yudan Shui
- Key Laboratory of Engineering Plastics, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Weiwei Zhao
- Key Laboratory of Engineering Plastics, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Alejandro J. Müller
- POLYMAT and Polymer Science and Technology Department, Faculty of Chemistry, University of the Basque Country UPV/EHU, Paseo Manuel de Lardizabal 3, 20018 Donostia-San Sebastián, Spain
- IKERBASQUE, Basque
Foundation for Science, Bilbao, Spain
| | - Dujin Wang
- Key Laboratory of Engineering Plastics, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of
Chinese Academy of Sciences, Beijing 100049, China
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5
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Lee B, Bleuel M, Zhao A, Ott D, Hakem IF, Bockstaller MR. Kinetics and Energetics of Solute Segregation in Granular Block Copolymer Microstructures. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b02044] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Markus Bleuel
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20988-8562, United States
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742-2115, United States
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6
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Yun YH, Kim ES, Shim WG, Yoon SD. Physical properties of mungbean starch/PVA bionanocomposites added nano-ZnS particles and its photocatalytic activity. J IND ENG CHEM 2018. [DOI: 10.1016/j.jiec.2018.07.029] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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7
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Rodrigues P, Santos RM, Paiva MC, Covas JA. Development of Dispersion during Compounding and Extrusion of Polypropylene/Graphite Nanoplates Composites. INT POLYM PROC 2017. [DOI: 10.3139/217.3485] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
Carbon-based nanoparticles have unique electrical, thermal, barrier and mechanical properties. When incorporated into polymer matrices, the resulting nanocomposites are potentially suitable for a wide scope of advanced applications. In practice, the properties of the nanocomposites are strongly determined by the level of dispersion achieved and by the degree of polymer/particle interfacial bonding. Production and processing of nanocomposites are often carried out in successive thermo-mechanical cycles. These may change the state of nanoparticle dispersion. This work analyzes the evolution of the dispersion of graphite nanoplates (GnP) in a polypropylene matrix during compounding in a co-rotating twin screw extruder and subsequent processing in a single screw extruder, aiming at a better understanding of the kinetics and stability of dispersion. Dispersion was evaluated along the compounding and processing stages and correlated with the composite electrical conductivity, an important engineering property. Two commercial GnP were used as received and chemically modified to graft PP-g-MA (fGnP-PP). Compositions with 2 or 10 wt.% of GnP and fGnP-PP were studied.
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Affiliation(s)
- P. Rodrigues
- Institute for Polymers and Composites/I3 N , University of Minho, Guimarães , Portugal
| | - R. M. Santos
- Institute for Polymers and Composites/I3 N , University of Minho, Guimarães , Portugal
| | - M. C. Paiva
- Institute for Polymers and Composites/I3 N , University of Minho, Guimarães , Portugal
| | - J. A. Covas
- Institute for Polymers and Composites/I3 N , University of Minho, Guimarães , Portugal
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8
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In-Situ Reduction of Au, Pd, and Pt Metal Precursors in Polyaniline: Electrochemistry of Variable Metal Content Polymer/Metal Composites in Alkaline Solution. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.08.120] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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9
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Entropy-driven segregation of polymer-grafted nanoparticles under confinement. Proc Natl Acad Sci U S A 2017; 114:2462-2467. [PMID: 28228522 DOI: 10.1073/pnas.1613828114] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The modification of nanoparticles with polymer ligands has emerged as a versatile approach to control the interactions and organization of nanoparticles in polymer nanocomposite materials. Besides their technological significance, polymer-grafted nanoparticle (PGNP) dispersions have attracted interest as model systems to understand the role of entropy as a driving force for microstructure formation. For instance, densely and sparsely grafted nanoparticles show distinct dispersion and assembly behaviors within polymer matrices due to the entropy variation associated with conformational changes in brush and matrix chains. Here we demonstrate how this entropy change can be harnessed to drive PGNPs into spatially organized domain structures on submicrometer scale within topographically patterned thin films. This selective segregation of PGNPs is induced by the conformational entropy penalty arising from local perturbations of grafted and matrix chains under confinement. The efficiency of this particle segregation process within patterned mesa-trench films can be tuned by changing the relative entropic confinement effects on grafted and matrix chains. The versatility of topographic patterning, combined with the compatibility with a wide range of nanoparticle and polymeric materials, renders SCPINS (soft-confinement pattern-induced nanoparticle segregation) an attractive method for fabricating nanostructured hybrid films with potential applications in nanomaterial-based technologies.
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10
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Wang G, Schmitt M, Wang Z, Lee B, Pan X, Fu L, Yan J, Li S, Xie G, Bockstaller MR, Matyjaszewski K. Polymerization-Induced Self-Assembly (PISA) Using ICAR ATRP at Low Catalyst Concentration. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b01966] [Citation(s) in RCA: 114] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Guowei Wang
- Department
of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
- State
Key Laboratory of Molecular Engineering of Polymers, Collaborative
Innovation Center of Polymers and Polymer Composite Materials, Department
of Macromolecular Science, Fudan University, Shanghai 200433, China
| | - Michael Schmitt
- Department of Materials Science & Engineering, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, Pennsylvania 15213, United States
| | - Zongyu Wang
- Department
of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
| | - Bongjoon Lee
- Department of Materials Science & Engineering, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, Pennsylvania 15213, United States
| | - Xiangcheng Pan
- Department
of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
| | - Liye Fu
- Department
of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
| | - Jiajun Yan
- Department
of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
| | - Sipei Li
- Department
of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
| | - Guojun Xie
- Department
of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
| | - Michael R. Bockstaller
- Department of Materials Science & Engineering, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, Pennsylvania 15213, United States
| | - Krzysztof Matyjaszewski
- Department
of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
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11
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Schmitt Pauly C, Genix AC, Alauzun JG, Jestin J, Sztucki M, Mutin PH, Oberdisse J. Structure of alumina-silica nanoparticles grafted with alkylphosphonic acids in poly(ethylacrylate) nanocomposites. POLYMER 2016. [DOI: 10.1016/j.polymer.2016.04.073] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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12
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Zhang R, Lee B, Bockstaller MR, Douglas JF, Stafford CM, Kumar SK, Raghavan D, Karim A. Confined Pattern-Directed Assembly of Polymer-Grafted Nanoparticles in a Phase Separating Blend with a Homopolymer Matrix. Macromolecules 2016; 49:3965-3974. [PMID: 27524836 PMCID: PMC4979748 DOI: 10.1021/acs.macromol.6b00228] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The controlled organization of nanoparticle (NP) constituents into superstructures of well-defined shape, composition and connectivity represents a continuing challenge in the development of novel hybrid materials for many technological applications. We show that the phase separation of polymer-tethered nanoparticles immersed in a chemically different polymer matrix provides an effective and scalable method for fabricating defined submicron-sized amorphous NP domains in melt polymer thin films. We investigate this phenomenon with a view towards understanding and controlling the phase separation process through directed nanoparticle assembly. In particular, we consider isothermally annealed thin films of polystyrene-grafted gold nanoparticles (AuPS) dispersed in a poly(methyl methacrylate) (PMMA) matrix. Classic binary polymer blend phase separation related morphology transitions, from discrete AuPS domains to bicontinuous to inverse domain structure with increasing nanoparticle composition is observed, yet the kinetics of the AuPS/PMMA polymer blends system exhibit unique features compared to the parent PS/PMMA homopolymer blend. We further illustrate how to pattern-align the phase-separated AuPS nanoparticle domain shape, size and location through the imposition of a simple and novel external symmetry-breaking perturbation via soft-lithography. Specifically, submicron-sized topographically patterned elastomer confinement is introduced to direct the nanoparticles into kinetically controlled long-range ordered domains, having a dense yet well-dispersed distribution of non-crystallizing nanoparticles. The simplicity, versatility and roll-to-roll adaptability of this novel method for controlled nanoparticle assembly should make it useful in creating desirable patterned nanoparticle domains for a variety of functional materials and applications.
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Affiliation(s)
- Ren Zhang
- Department of Polymer Engineering, the University of Akron, Akron, OH 44325
| | - Bongjoon Lee
- Department of Materials Science and Engineering, Carnegie Mellon University, 5000 Forbes Ave, Pittsburgh, PA 15213
| | - Michael R. Bockstaller
- Department of Materials Science and Engineering, Carnegie Mellon University, 5000 Forbes Ave, Pittsburgh, PA 15213
| | - Jack F. Douglas
- Materials Science and Engineering Division, NIST, Gaithersburg, MD 20889
| | | | - Sanat K. Kumar
- Department of Chemical Engineering, Columbia University, 116th St & Broadway, New York, NY 10027
| | | | - Alamgir Karim
- Department of Polymer Engineering, the University of Akron, Akron, OH 44325
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13
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Zhang R, Lee B, Bockstaller MR, Al-Enizi AM, Elzatahry A, Berry BC, Karim A. Soft-shear induced phase-separated nanoparticle string-structures in polymer thin films. Faraday Discuss 2016; 186:31-43. [PMID: 26814827 DOI: 10.1039/c5fd00141b] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Application of shear stress has been shown to unidirectionally orient the microstructures of block copolymers and polymer blends. In the present work, we study the phase separation of a novel nanoparticle (NP)-polymer blend thin film system under shear using a soft-shear dynamic zone annealing (DZA-SS) method. The nanoparticles are densely grafted with polymer chains of chemically dissimilar composition from the matrix polymer, which induces phase separation upon thermal annealing into concentrated nanoparticle domains. We systematically examine the influence of DZA-SS translation speed and thus the effective shear rate on nanoparticle domain elongation and compare this with the counterpart binary polymer blend behavior. Unidirectionally aligned nanoparticle string-domains are fabricated in the presence of soft-shear in confined thin film geometry. We expect this DZA-SS method to be applicable to various NP-polymer blends towards unidirectionally aligned nanoparticle structures, which are important to functional nanoparticle structure fabrication.
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Affiliation(s)
- Ren Zhang
- Department of Polymer Engineering, The University of Akron, 250 S Forge St, Akron, OH 44325, USA.
| | - Bongjoon Lee
- Department of Materials Science and Engineering, Carnegie Mellon University, 5000 Forbes Ave, Pittsburgh, PA 152133, USA
| | - Michael R Bockstaller
- Department of Materials Science and Engineering, Carnegie Mellon University, 5000 Forbes Ave, Pittsburgh, PA 152133, USA
| | - Abdullah M Al-Enizi
- Chemistry Department, Faculty of Science, King Saud University, PO Box 2455, Riyadh 11451, Saudi Arabia
| | - Ahmed Elzatahry
- Materials Science and Technology Program, College of Arts and Sciences, Qatar University, PO Box 2713, Doha, Qatar and Polymer Materials Research Department, Advanced Technology and New Materials Research Institute, City of Scientific Research and Technology Applications, New Borg El-Arab City, Alexandria 21934, Egypt
| | - Brian C Berry
- Department of Chemistry and Applied Science Program, University of Arkansas at Little Rock, College of Arts, Letters & Sciences, 2801 S University Avenue, Little Rock, AR 72204, USA
| | - Alamgir Karim
- Department of Polymer Engineering, The University of Akron, 250 S Forge St, Akron, OH 44325, USA.
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14
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Cheng D, Xie R, Jin L, Cao M, Jia X, Cai Q, Yang X. Enhancing the biological properties of carbon nanofibers by controlling the crystallization of incorporated bioactive glass via silicon content. RSC Adv 2016. [DOI: 10.1039/c6ra03229j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Mechanism and model of biomineralization behavior of CNF and CNF/BG hybrids containing BG with different silicon contents.
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Affiliation(s)
- Dan Cheng
- State Key Laboratory of Organic–Inorganic Composites
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
| | - Rongrong Xie
- State Key Laboratory of Organic–Inorganic Composites
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
| | - Le Jin
- State Key Laboratory of Organic–Inorganic Composites
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
| | - Man Cao
- State Key Laboratory of Organic–Inorganic Composites
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
| | - Xiaolong Jia
- State Key Laboratory of Organic–Inorganic Composites
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
| | - Qing Cai
- State Key Laboratory of Organic–Inorganic Composites
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
| | - Xiaoping Yang
- State Key Laboratory of Organic–Inorganic Composites
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
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15
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Jia X, Tang T, Cheng D, Zhang C, Zhang R, Cai Q, Yang X. Micro-structural evolution and biomineralization behavior of carbon nanofiber/bioactive glass composites induced by precursor aging time. Colloids Surf B Biointerfaces 2015; 136:585-93. [DOI: 10.1016/j.colsurfb.2015.09.062] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2015] [Revised: 08/17/2015] [Accepted: 09/28/2015] [Indexed: 10/23/2022]
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16
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Diop MF, Torkelson JM. Effects of process method and quiescent coarsening on dispersed-phase size distribution in polymer blends: comparison of solid-state shear pulverization with intensive batch melt mixing. Polym Bull (Berl) 2015. [DOI: 10.1007/s00289-014-1299-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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17
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Sarkar B, Alexandridis P. Block copolymer–nanoparticle composites: Structure, functional properties, and processing. Prog Polym Sci 2015. [DOI: 10.1016/j.progpolymsci.2014.10.009] [Citation(s) in RCA: 180] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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18
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Amarandei G, Clancy I, O'Dwyer C, Arshak A, Corcoran D. Stability of ultrathin nanocomposite polymer films controlled by the embedding of gold nanoparticles. ACS APPLIED MATERIALS & INTERFACES 2014; 6:20758-20767. [PMID: 25491070 DOI: 10.1021/am5049543] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Thin and ultrathin polymer films combined with nanoparticles (NPs) are of significant interest as they are used in a host of industrial applications. In this paper we describe the stability of such films (hpoly ≤ 30 nm) to dewetting, specifically, how the development of a spinodal instability in a composite NP-polymer layer is controlled by the embedding of Au NPs. At working temperatures (T = 170 °C) above the polymer glass transition temperature (Tg ≈ 100 °C) the absence of Au NPs leads to film rupture by nucleation dewetting, while their presence over a large surface area enhances the development of a spinodal instability without destroying the film continuity. When the NPs embed, the surface undulations are suppressed. The dynamics change from an unstable to a stable state, and the thin composite NP-polymer layer returns to a flat configuration, while the wavelength of the pattern remains constant. Moreover, we demonstrate from a thermodynamic perspective that NPs will remain on the surface or embed in the polymer film depending on their free energy, which is determined by the NP interactions with the underlying polymer, the native SiOx layer, and the Si substrate.
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Affiliation(s)
- George Amarandei
- Department of Physics and Energy, University of Limerick , Limerick, Ireland
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19
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Jia X, Tang T, Cheng D, Guo L, Zhang C, Cai Q, Yang X. Growth mechanism of bioglass nanoparticles in polyacrylonitrile-based carbon nanofibers. RSC Adv 2014. [DOI: 10.1039/c4ra12177e] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
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20
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Crespo O, Dı́az C, O’Dwyer C, Gimeno MC, Laguna A, Ospino I, Valenzuela ML. Luminescent Gold and Silver Complexes with the Monophosphane 1-(PPh2)-2-Me-C2B10H10 and Their Conversion to Gold Micro- and Superstructured Materials. Inorg Chem 2014; 53:7260-9. [DOI: 10.1021/ic5005424] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Olga Crespo
- Departamento de Quı́mica
Inorgánica, Universidad de Zaragoza-CSIC, Instituto de Sı́ntesis Quı́mica y Catálisis Homogénea (ISQCH), Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Carlos Dı́az
- Departamento de Quı́mica,
Facultad
de Ciencias, Universidad de Chile, Las Palmeras 3425 Nuñoa, Casilla 653, Santiago, Chile
| | - Colm O’Dwyer
- Department of Chemistry, University College Cork, College Road, Cork, Ireland
- Micro & Nanoelectronics Centre, Tyndall National Institute, Lee Maltings, Dyke Parade, Cork, Ireland
- Materials and Surface Science Institute, University of Limerick, Limerick, Ireland
| | - M. Concepción Gimeno
- Departamento de Quı́mica
Inorgánica, Universidad de Zaragoza-CSIC, Instituto de Sı́ntesis Quı́mica y Catálisis Homogénea (ISQCH), Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Antonio Laguna
- Departamento de Quı́mica
Inorgánica, Universidad de Zaragoza-CSIC, Instituto de Sı́ntesis Quı́mica y Catálisis Homogénea (ISQCH), Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Isaura Ospino
- Departamento de Quı́mica
Inorgánica, Universidad de Zaragoza-CSIC, Instituto de Sı́ntesis Quı́mica y Catálisis Homogénea (ISQCH), Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Maria Luisa Valenzuela
- Dirección
de Investigación y Postgrado, Universidad Autónoma de Chile, Av. Carlos Antúnez 1920, Santiago, Chile
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21
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Banc A, Genix AC, Chirat M, Dupas C, Caillol S, Sztucki M, Oberdisse J. Tuning Structure and Rheology of Silica–Latex Nanocomposites with the Molecular Weight of Matrix Chains: A Coupled SAXS–TEM–Simulation Approach. Macromolecules 2014. [DOI: 10.1021/ma500465n] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Amélie Banc
- Laboratoire
Charles Coulomb, UMR 5221, Université Montpellier 2, F-34 095, Montpellier, France
- Laboratoire
Charles Coulomb, UMR 5221, CNRS, F-34 095, Montpellier, France
| | - Anne-Caroline Genix
- Laboratoire
Charles Coulomb, UMR 5221, Université Montpellier 2, F-34 095, Montpellier, France
- Laboratoire
Charles Coulomb, UMR 5221, CNRS, F-34 095, Montpellier, France
| | - Mathieu Chirat
- Laboratoire
Charles Coulomb, UMR 5221, Université Montpellier 2, F-34 095, Montpellier, France
- Laboratoire
Charles Coulomb, UMR 5221, CNRS, F-34 095, Montpellier, France
| | - Christelle Dupas
- Laboratoire
Charles Coulomb, UMR 5221, Université Montpellier 2, F-34 095, Montpellier, France
- Laboratoire
Charles Coulomb, UMR 5221, CNRS, F-34 095, Montpellier, France
| | - Sylvain Caillol
- UMR
5253 CNRS-UM2-ENSCM-UM1, Equipe I.A.M., Institut Charles Gerhardt Montpellier, 8 rue de l’Ecole Normale, F-34 296 Montpellier Cedex 5, France
| | - Michael Sztucki
- European Synchrotron Radiation Facility, ESRF, 6 rue Jules Horowitz, BP 220, F-38
043, Grenoble, Cedex 9, France
| | - Julian Oberdisse
- Laboratoire
Charles Coulomb, UMR 5221, Université Montpellier 2, F-34 095, Montpellier, France
- Laboratoire
Charles Coulomb, UMR 5221, CNRS, F-34 095, Montpellier, France
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22
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Ryu HJ, Sun J, Avgeropoulos A, Bockstaller MR. Retardation of Grain Growth and Grain Boundary Pinning in Athermal Block Copolymer Blend Systems. Macromolecules 2014. [DOI: 10.1021/ma4021714] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hyung Ju Ryu
- Department
of Materials Science and Engineering, Carnegie Mellon University, 5000
Forbes Ave., Pittsburgh, Pennsylvania 15213, United States
| | - Jane Sun
- Department
of Materials Science and Engineering, Carnegie Mellon University, 5000
Forbes Ave., Pittsburgh, Pennsylvania 15213, United States
| | - Apostolos Avgeropoulos
- Department
of Materials Science and Engineering, University of Ioannina, University Campus - Dourouti, 45110 Ioannina, Greece
| | - Michael R. Bockstaller
- Department
of Materials Science and Engineering, Carnegie Mellon University, 5000
Forbes Ave., Pittsburgh, Pennsylvania 15213, United States
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23
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Pletsch H, Peng L, Mitschang F, Schaper A, Hellwig M, Nette D, Seubert A, Greiner A, Agarwal S. Ultrasound-mediated synthesis of high-molecular weight polystyrene-grafted silver nanoparticles by facile ligand exchange reactions in suspension. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2014; 10:201-208. [PMID: 24038884 DOI: 10.1002/smll.201300594] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2013] [Revised: 07/20/2013] [Indexed: 06/02/2023]
Abstract
Ultrasound mediated facile ligand exchange method in suspension for the formation of polystyrene-grafted silver nanoparticles is reported. Amazingly, this method allows even grafting of very high molecular weight polystyrenes (up to 217 200 g mol(-1) ) having a single terminal thiol group at the chain end. Detailed studies are carried out to gain insights in the role of molecular weight of the ligands and the mechanism of the ligand exchange reactions. Key factors are determined to be the droplet formation by ultrasonification and low silver content, which enhances the availability of the terminal thiol end group significantly. The extraordinary compatibility of the ligand exchange method in particular regarding high molecular weights is attributed to hydrophilic orientation of the terminal thiol groups at the liquid-liquid interphase. This is proved conclusively by using an in situ method as a reference approach in which agglomeration occurs at considerably lower molecular weights due to the absence of preferred end group orientation within the polymer coil. In homogeneous phase only the chain length is found to be the crucial factor in stabilization of silver nanoparticles.
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Affiliation(s)
- Holger Pletsch
- Universität Bayreuth, Macromolecular Chemistry II and Bayreuth, Center for Colloids and Interfaces, Universitätsstraße 30, 95440, Bayreuth, Germany
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24
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Heo K, Miesch C, Emrick T, Hayward RC. Thermally reversible aggregation of Gold nanoparticles in polymer nanocomposites through hydrogen bonding. NANO LETTERS 2013; 13:5297-5302. [PMID: 24164466 DOI: 10.1021/nl402813q] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The ability to tune the state of dispersion or aggregation of nanoparticles within polymer-based nanocomposites, through variations in the chemical and physical interactions with the polymer matrix, is desirable for the design of materials with switchable properties. In this study, we introduce a simple and effective means of reversibly controlling the association state of nanoparticles based on the thermal sensitivity of hydrogen bonds between the nanoparticle ligands and the matrix. Strong hydrogen bonding interactions provide excellent dispersion of gold nanoparticles functionalized with poly(styrene-r-2-vinylpyridine) [P(S-r-2VP)] ligands in a poly(styrene-r-4-vinyl phenol) [P(S-r-4VPh)] matrix. However, annealing at higher temperatures diminishes the strength of these hydrogen bonds, driving the nanoparticles to aggregate. This behavior is largely reversible upon annealing at reduced temperature with redispersion occurring on a time-scale of ~30 min for samples annealed 50 °C above the glass transition temperature of the matrix. Using ultraviolet-visible absorption spectroscopy (UV-vis) and transmission electron microscopy (TEM), we have established the reversibility of aggregation and redispersion through multiple cycles of heating and cooling.
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Affiliation(s)
- Kyuyoung Heo
- Department of Polymer Science and Engineering, University of Massachusetts , Amherst, Massachusetts 01003, United States
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25
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Zhang R, Singh G, Dang A, Dai L, Bockstaller MR, Akgun B, Satija S, Karim A. Nanoparticle-Driven Orientation Transition and Soft-Shear Alignment in Diblock Copolymer Films via Dynamic Thermal Gradient Field. Macromol Rapid Commun 2013; 34:1642-7. [DOI: 10.1002/marc.201300485] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2013] [Revised: 08/13/2013] [Indexed: 11/05/2022]
Affiliation(s)
- Ren Zhang
- Department of Polymer Engineering; The University of Akron Akron, OH 44325 USA
| | - Gurpreet Singh
- IBM Almaden Research Center; 650 Harry Road San Jose CA 95120
| | - Alei Dang
- Department of Materials Science and Engineering; Carnegie Mellon University, 5000, Forbes Ave Pittsburgh, PA 15213 USA
| | - Lu Dai
- Department of Materials Science and Engineering; Carnegie Mellon University, 5000, Forbes Ave Pittsburgh, PA 15213 USA
| | - Michael R. Bockstaller
- Department of Materials Science and Engineering; Carnegie Mellon University, 5000, Forbes Ave Pittsburgh, PA 15213 USA
| | - Bulent Akgun
- NIST Center for Neutron Research, NIST; Gaithersburg, MD 20889 USA
- Department of Materials Science and Engineering; University of Maryland, College Park 20742 USA
- Department of Chemistry; Bogazici University Bebek Istanbul 34342 Turkey
| | - Sushil Satija
- NIST Center for Neutron Research, NIST; Gaithersburg, MD 20889 USA
| | - Alamgir Karim
- Department of Polymer Engineering; The University of Akron Akron, OH 44325 USA
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26
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Amarandei G, O'Dwyer C, Arshak A, Corcoran D. Fractal patterning of nanoparticles on polymer films and their SERS capabilities. ACS APPLIED MATERIALS & INTERFACES 2013; 5:8655-8662. [PMID: 23980932 DOI: 10.1021/am402285e] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We demonstrate control, via electro-hydrodynamic (EHD) induced polymer instabilities and nanoparticle mobility, of hierarchical fractal arrangements of gold nanoparticles on patterned thin polymer films. The induced changes in the film curvature enhance fractal formation for high and not for low mobility nanoparticles. The high mobility nanoparticles cluster in circular fractal networks on the rims of a hexagonally ordered array of EHD-induced polymer peaks. These arrangements exhibit plasmonic properties for surface-enhanced Raman scattering (SERS) spectroscopy.
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Affiliation(s)
- George Amarandei
- Department of Physics and Energy and ⊥Materials and Surface Science Institute, University of Limerick , Ireland
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27
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Ojha S, Dang A, Hui CM, Mahoney C, Matyjaszewski K, Bockstaller MR. Strategies for the synthesis of thermoplastic polymer nanocomposite materials with high inorganic filling fraction. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:8989-8996. [PMID: 23786358 DOI: 10.1021/la401522v] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The governing parameters controlling the miscibility of particle additives within polymeric host media are analyzed for the particular case of silica particle fillers embedded within a poly(methyl methacrylate) (PMMA) matrix. For athermal polymer-graft modification of particles (corresponding to equal chemical composition of graft and matrix polymer), compatibility is found to be a sensitive function of the degree of polymerization of graft and host polymer chains as well as the particle radius. In agreement with theoretical predictions, uniform particle dispersion is observed if the degree of polymerization of grafted chains is comparable to (or exceeds) the corresponding value of the polymer matrix. The resulting restriction to high degree of polymerization limits the accessible inorganic fraction that is attainable in athermal particle/polymer blends. In contrast, favorable interaction between grafted polymer chains and the polymeric host (as realized in the case of poly(styrene-r-acrylonitrile)-grafted particles embedded within PMMA matrix) is shown to facilitate thermodynamically stable and uniform particle dispersion across the entire compositional range even in the limit of large particle size, short grafted chains, and high molecular matrix chains. The synthesis of thermoplastic composite materials with inorganic fraction exceeding 50 vol % combining quantitative optical limiting within the UV frequency range and polymer-like mechanical properties is demonstrated.
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Affiliation(s)
- Satyajeet Ojha
- Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
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28
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Ledo-Suárez A, Hoppe CE, Lazzari M, Lopez Quintela MA, Zucchi IA. Thermal annealing as an easy tool for the controlled arrangement of gold nanoparticles in block-copolymer thin films. NANOTECHNOLOGY 2013; 24:255304. [PMID: 23723175 DOI: 10.1088/0957-4484/24/25/255304] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Thermal annealing was used for the bottom-up fabrication of morphologically controlled gold-block-copolymer (Au-BC) nanocomposites. Three different blends formed by polystyrene (PS) homopolymer and PS-coated gold nanoparticles (PSSH@Au) were used as modifiers of asymmetric polystyrene-b-polymethylmethacrylate (PS-b-PMMA): PS26/PS26SH@Au, PS75/PS75SH@Au and PS167/PS167SH@Au (where the subscripts refer to the number of styrene monomeric units).The results indicated that all three blends used as modifiers (PSn/PSnSH@Au) were successfully located in the PS phase during thermally induced BC self-assembly for a composition range from 5 to 43 wt% without macro-phase separation. The PSnSH@Au moiety experienced molecular desorption, nanocrystal core coalescence and partial molecular re-encapsulation processes during thermal annealing, leading to sphere-like gold NPs with a larger average size (without exceeding an interdomain distance). Ligand chain length regulated the degree of coalescence and re-encapsulation, defining ultimate core size. Furthermore, proper combination of chain length and composition enabled tuning of NP partitioning and arrangement on different length scales through thermally activated cooperative assembly processes. These results have not only significant impact for establishing thermal processing as a useful tool for the precise control of NP size and distribution, but also much broader implications for many nanoparticle-based technologies.
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Affiliation(s)
- Ana Ledo-Suárez
- Centre for Research in Biological Chemistry and Molecular Materials (CIQUS), c Jenaro de la Fuente-Campus Vida, University of Santiago de Compostela (USC), E-15782 Santiago de Compostela, Spain
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29
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Amarandei G, O'Dwyer C, Arshak A, Thiele U, Steiner U, Corcoran D. Effect of Au nanoparticle spatial distribution on the stability of thin polymer films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:6706-6714. [PMID: 23688358 DOI: 10.1021/la400659q] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The stability of thin poly(methyl-methacrylate) (PMMA) films of low molecular weight on a solid substrate is controlled by the areal coverage of gold nanoparticles (NPs) present at the air-polymer interface. As the polymer becomes liquid the Au NPs are free to diffuse, coalesce, and aggregate while the polymer film can change its morphology through viscous flow. These processes lead at the same time to the formation of a fractal network of Au NPs and to the development of spinodal instabilities of the free surface of the polymer films. For thinner films a single wavelength is observed, while for thicker films two wavelengths compete. With continued heating the aggregation process results in a decrease in coverage, the networks evolve into disordered particle assemblies, while the polymer films flatten again. The disordering occurs first on the smallest scales and coincides (in thicker films) with the disappearance of the smaller wavelength. The subsequent disordering on larger scales causes the films to flatten.
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Affiliation(s)
- George Amarandei
- Department of Physics and Energy, University of Limerick, Limerick, Ireland.
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30
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Kumar SK, Jouault N, Benicewicz B, Neely T. Nanocomposites with Polymer Grafted Nanoparticles. Macromolecules 2013. [DOI: 10.1021/ma4001385] [Citation(s) in RCA: 594] [Impact Index Per Article: 54.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Sanat K. Kumar
- Department of Chemical Engineering, Columbia University, New York, New York 10027, United
States
| | - Nicolas Jouault
- Department of Chemical Engineering, Columbia University, New York, New York 10027, United
States
| | - Brian Benicewicz
- Department
of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Tony Neely
- Department
of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
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31
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Khullar P, Singh V, Mahal A, Kumar H, Kaur G, Bakshi MS. Block Copolymer Micelles as Nanoreactors for Self-Assembled Morphologies of Gold Nanoparticles. J Phys Chem B 2013; 117:3028-39. [DOI: 10.1021/jp310507m] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Poonam Khullar
- Department of
Chemistry, B.B.K. D.A.V. College for Women, Amritsar 143005, Punjab,
India
| | - Vijender Singh
- Department of
Chemistry, B.B.K. D.A.V. College for Women, Amritsar 143005, Punjab,
India
| | - Aabroo Mahal
- Department of
Chemistry, B.B.K. D.A.V. College for Women, Amritsar 143005, Punjab,
India
- Department of Chemistry, Dr. B. R. Ambedkar National Institute of Technology, Jalandhar-144011, India
| | - Harsh Kumar
- Department of Chemistry, Dr. B. R. Ambedkar National Institute of Technology, Jalandhar-144011, India
| | - Gurinder Kaur
- Nanotechnology Research Laboratory, College of North Atlantic, Labrador City, NL A2 V
2K7 Canada
| | - Mandeep Singh Bakshi
- Department of Chemistry, Wilfrid Laurier University, Science Building, 75 University
Ave. W., Waterloo ON N2L 3C5, Canada
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32
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A modifier that enables the easy dispersion of alkyl-coated nanoparticles in an epoxy network. Colloid Polym Sci 2013. [DOI: 10.1007/s00396-013-2902-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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33
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Lee SJ, An HH, Han WB, Kim HS, Yoon CS. Effect of temperature and humidity on coarsening behavior of Au nanoparticles embedded in liquid crystalline lipid membrane. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:10980-10987. [PMID: 22708796 DOI: 10.1021/la301124d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Coarsening behavior of the Au nanoparticles produced by thermal evaporation of Au onto a liquid crystalline lipid (1,2-dioleoyl-3-trimethylammonium-propane, DOTAP) membrane was investigated by subjecting the nanoparticle-embedded DOTAP membrane to two different annealing conditions (at 100 °C under no humidity and at 20 °C and 80% relative humidity). Although the coarsening rate was relatively slow because of the low temperature (from 5.6 nm in the as-deposited state to ~7 nm after 30 h), it was identified that at 100 °C without humidity the Au nanoparticles resulted in shape refinement whereas the high humidity at 20 °C induced self-organization of the nanoparticles into a monolayer. It was also found that annealing in both cases tended to segregate the lipid molecules from the nanoparticle array and forced the nanoparticles into a tighter area. In the case of the high-humidity sample, the lipid segregation eventually led to extensive coalescence of the Au nanoparticles.
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Affiliation(s)
- Seung Jae Lee
- Division of Materials Science and Engineering, Hanyang University, Seoul, Korea
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34
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Skrdla PJ. Roles of nucleation, denucleation, coarsening, and aggregation kinetics in nanoparticle preparations and neurological disease. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:4842-4857. [PMID: 22324463 DOI: 10.1021/la205034u] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Kinetic models for nucleation, denucleation, Ostwald ripening (OR), and nanoparticle (NP) aggregation are presented and discussed from a physicochemical standpoint, in terms of their role in current NP preparations. Each of the four solid-state mechanisms discussed predict a distinct time dependence for the evolution of the mean particle radius over time. Additionally, they each predict visually different particle size distributions (PSDs) under limiting steady-state (time-independent) conditions. While nucleation and denucleation represent phase transformation mechanisms, OR and NP aggregation do not. Thus, when modeling solid-state kinetics relevant to NP processing, either the time evolution of the mean particle radius or the fractional conversion data should be fit using appropriate models (discussed herein), without confusing/combining the two classes of models. Experimental data taken from the recent literature are used to demonstrate the usefulness of the models in real-world applications. Specifically, the following examples are discussed: the preparation of bismuth NPs, the synthesis of copper indium sulfide nanocrystals, and the aggregation of neurological proteins. Because the last process is found to obey reaction-limited colloid aggregation (RLCA) kinetics, potential connections between protein aggregation rates, the onset of neurological disease, and population lifespan dynamics are suggested by drawing a parallel between RLCA kinetics and Gompertz kinetics. The physical chemistry underpinning NP aggregation is investigated, and a detailed definition of the rate constant of aggregation, k(a), is put forth that provides insight into the origin of the activation energy barrier of aggregation. For the two nanocrystal preparations investigated, the initial kinetics are found to be well-described by the author's dispersive kinetic model for nucleation-and-growth, while the late-stage NP size evolution is dominated by OR. At intermediate times, it is thought that the two mechanisms both contribute to the NP growth, resulting in PSD focusing as discussed in a previous work [Skrdla, P. J. J. Phys. Chem. C2012, 116, 214-225]. On the basis of these two mechanisms, a synthetic procedure for obtaining monodisperse NP PSDs, of small and/or systematically targeted mean sizes, is proposed.
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35
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Liu J, Gao Y, Cao D, Zhang L, Guo Z. Nanoparticle dispersion and aggregation in polymer nanocomposites: insights from molecular dynamics simulation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:7926-33. [PMID: 21595451 DOI: 10.1021/la201073m] [Citation(s) in RCA: 177] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
It is a great challenge to fully understand the microscopic dispersion and aggregation of nanoparticles (NPs) in polymer nanocomposites (PNCs) through experimental techniques. Here, coarse-grained molecular dynamics is adopted to study the dispersion and aggregation mechanisms of spherical NPs in polymer melts. By tuning the polymer-filler interaction in a wide range at both low and high filler loadings, we qualitatively sketch the phase behavior of the PNCs and structural spatial organization of the fillers mediated by the polymers, which emphasize that a homogeneous filler dispersion exists just at the intermediate interfacial interaction, in contrast with traditional viewpoints. The conclusion is in good agreement with the theoretically predicted results from Schweizer et al. Besides, to mimick the experimental coarsening process of NPs in polymer matrixes (ACS Nano 2008, 2, 1305), by grafting polymer chains on the filler surface, we obtain a good filler dispersion with a large interparticle distance. Considering the PNC system without the presence of chemical bonding between the NPs and the grafted polymer chains, the resulting good dispersion state is further used to investigate the effects of the temperature, polymer-filler interaction, and filler size on the filler aggregation process. It is found that the coarsening or aggregation process of the NPs is sensitive to the temperature, and the aggregation extent reaches the minimum in the case of moderate polymer-filler interaction, because in this case a good dispersion is obtained. That is to say, once the filler achieves a good dispersion in a polymer matrix, the properties of the PNCs will be improved significantly, because the coarsening process of the NPs will be delayed and the aging of the PNCs will be slowed.
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Affiliation(s)
- Jun Liu
- Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China
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36
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Keul HA, Ryu HJ, Möller M, Bockstaller MR. Anion effect on the shape evolution of gold nanoparticles during seed-induced growth in imidazolium-based ionic liquids. Phys Chem Chem Phys 2011; 13:13572-8. [DOI: 10.1039/c1cp20518h] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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37
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Bockstaller MR, Ryu HJ, Ojha S, Choi J. 1D periodic bimetallic superstructures by co-assembly of ternary block copolymer/nanoparticle blends. ACTA ACUST UNITED AC 2010. [DOI: 10.1039/c0jm01810d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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