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Sharma A, Kruteva M, Zamponi M, Ehlert S, Richter DO, Förster S. Quasielastic neutron scattering reveals the temperature dependent rotational dynamics of densely grafted oleic acid.. J Chem Phys 2022; 156:164908. [DOI: 10.1063/5.0089874] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We study the dynamics of pure oleic acid as well as grafted oleic acid synthesized by decomposing iron oleate into oleic acid grafted iron oxide nanoparticles. Our quasielastic neutron scattering study shows that oleic acid dominantly performs translational diffusion at room temperature. On the other hand, in nanocomposites the constraints imposed by grafting and crowding of neighbouring chains restrict the grafted oleic acid to uniaxial rotation. Interestingly, it also manifests mobility in grafted oleic acid below the crystallization temperature of pure oleic acid. The data from grafted oleic acid could be effectively described using uniaxial rotational diffusion model with an additional elastic scattering contribution. This kind of elastic scattering arises due to the restricted bond mobility and increases with decreasing temperature. The radius of rotation obtained from the fitted data agrees very well with the geometry of the molecule and grafting density. These results open possibilities of research on the confined surfactant systems, which could be analysed using the approach described here.
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Affiliation(s)
- Aakash Sharma
- Forschungszentrum Julich GmbH Julich Centre for Neutron Science, Germany
| | | | | | - Sascha Ehlert
- Forschungszentrum Jülich GmbH Jülich Centre for Neutron Science, Germany
| | | | - Stephan Förster
- Forschungszentrum Julich GmbH Julich Centre for Neutron Science, Germany
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Bustamante-Torres M, Romero-Fierro D, Arcentales-Vera B, Pardo S, Bucio E. Interaction between Filler and Polymeric Matrix in Nanocomposites: Magnetic Approach and Applications. Polymers (Basel) 2021; 13:2998. [PMID: 34503038 PMCID: PMC8434030 DOI: 10.3390/polym13172998] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Revised: 08/30/2021] [Accepted: 09/03/2021] [Indexed: 01/09/2023] Open
Abstract
In recent years, polymer nanocomposites produced by combining nanofillers and a polymeric matrix are emerging as interesting materials. Polymeric composites have a wide range of applications due to the outstanding and enhanced properties that are obtained thanks to the introduction of nanoparticles. Therefore, understanding the filler-matrix relationship is an important factor in the continued growth of this scientific area and the development of new materials with desired properties and specific applications. Due to their performance in response to a magnetic field magnetic nanocomposites represent an important class of functional nanocomposites. Due to their properties, magnetic nanocomposites have found numerous applications in biomedical applications such as drug delivery, theranostics, etc. This article aims to provide an overview of the filler-polymeric matrix relationship, with a special focus on magnetic nanocomposites and their potential applications in the biomedical field.
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Affiliation(s)
- Moises Bustamante-Torres
- Departamento de Biología, Escuela de Ciencias Biológicas e Ingeniería, Universidad de Investigación de Tecnología Experimental Yachay, Urcuquí 100650, Ecuador
- Departamento de Química de Radiaciones y Radioquímica, Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Ciudad de Mexico 04510, Mexico;
| | - David Romero-Fierro
- Departamento de Química de Radiaciones y Radioquímica, Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Ciudad de Mexico 04510, Mexico;
- Departamento de Química, Escuela de Ciencias Química e Ingeniería, Universidad de Investigación de Tecnología Experimental Yachay, Urcuquí 100650, Ecuador;
| | - Belén Arcentales-Vera
- Departamento de Química, Escuela de Ciencias Química e Ingeniería, Universidad de Investigación de Tecnología Experimental Yachay, Urcuquí 100650, Ecuador;
| | - Samantha Pardo
- Facultad de Ciencias de la Vida, Universidad Politécnica Salesiana, Quito 170702, Ecuador;
| | - Emilio Bucio
- Facultad de Ciencias de la Vida, Universidad Politécnica Salesiana, Quito 170702, Ecuador;
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Ok S, Vayer M, Sinturel C. A decade of innovation and progress in understanding the morphology and structure of heterogeneous polymers in rigid confinement. SOFT MATTER 2021; 17:7430-7458. [PMID: 34341814 DOI: 10.1039/d1sm00522g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
When confined in nanoscale domains, polymers generally encounter changes in their structural, thermodynamics and dynamics properties compared to those in the bulk, due to the high amount of polymer/wall interfaces and limited amount of matter. The present review specifically deals with the confinement of heterogeneous polymers (i.e. polymer blends and block copolymers) in rigid nanoscale domains (i.e. bearing non-deformable solid walls) where the processes of phase separation and self-assembly can be deeply affected. This review focuses on the innovative contributions of the last decade (2010-2020), giving a summary of the new insights and understanding gained in this period. We conclude this review by giving our view on the most thriving directions for this topic.
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Affiliation(s)
- Salim Ok
- Petroleum Research Center, Kuwait Institute for Scientific Research, P.O. Box 24885, Safat, 13109, Kuwait.
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Kuttich B, Hoffmann I, Stühn B. Disentangling of complex polymer dynamics under soft nanoscopic confinement. SOFT MATTER 2020; 16:10377-10385. [PMID: 33057543 DOI: 10.1039/d0sm01058h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We discuss the complex interplay between host and guest dynamics for a polymer in soft confinement by a droplet-phase microemulsion. Intermediate scattering functions obtained by neutron spin echo spectroscopy are first analysed by means of an effective diffusion coefficient. From its dependence on the absolute of the scattering vector q we concluded a sophisticated model for the systems dynamics taking both polymer and microemulsion contributions into account. Global fitting of this model to the intermediate scattering functions at all measured q-values and all investigated confinement sizes eventually allows for a precise disentangling of the pure polymer dynamics in confinement from the overlaying microemulsion dynamics. Validity of our approach is further supported by numerical random walk calculations.
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Affiliation(s)
- Björn Kuttich
- Experimental Condensed Matter Physics, TU Darmstadt, Germany
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Kinsey T, Mapesa E, Cosby T, He Y, Hong K, Wang Y, Iacob C, Sangoro J. Elucidating the impact of extreme nanoscale confinement on segmental and chain dynamics of unentangled poly(cis-1,4-isoprene). THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2019; 42:137. [PMID: 31650417 DOI: 10.1140/epje/i2019-11907-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Accepted: 10/11/2019] [Indexed: 06/10/2023]
Abstract
Broadband dielectric spectroscopy is employed to probe dynamics in low molecular weight poly(cis-1,4-isoprene) (PI) confined in unidirectional silica nanopores with mean pore diameter, D, of 6.5 nm. Three molecular weights of PI (3, 7 and 10 kg/mol) were chosen such that the ratio of D to the polymer radius of gyration, Rg, is varied from 3.4, 2.3 to 1.9, respectively. It is found that the mean segmental relaxation rate remains bulk-like but an additional process arises at lower frequencies with increasing molecular weight (decreasing D/Rg. In contrast, the mean relaxation rates of the end-to-end dipole vector corresponding to chain dynamics are found to be slightly slower than that in the bulk for the systems approaching D/Rg ∼ 2, but faster than the bulk for the polymer with the largest molecular weight. The analysis of the spectral shapes of the chain relaxation suggests that the resulting dynamics of the 10kg/mol PI confined at length-scales close to that of the Rg are due to non-ideal chain conformations under confinement decreasing the chain relaxation times. The understanding of these faster chain dynamics of polymers under extreme geometrical confinement is necessary in designing nanodevices that contain polymeric materials within substrates approaching the molecular scale.
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Affiliation(s)
- Thomas Kinsey
- Department of Chemical and Biomolecular Engineering, University of Tennessee, 37996, Knoxville, TN, USA
| | - Emmanuel Mapesa
- Department of Chemical and Biomolecular Engineering, University of Tennessee, 37996, Knoxville, TN, USA
| | - Tyler Cosby
- Department of Chemical and Biomolecular Engineering, University of Tennessee, 37996, Knoxville, TN, USA
| | - Youjun He
- Center for Nanophase Materials Science, Oak Ridge National Laboratory, 37831, Oak Ridge, TN, USA
| | - Kunlun Hong
- Center for Nanophase Materials Science, Oak Ridge National Laboratory, 37831, Oak Ridge, TN, USA
| | - Yangyang Wang
- Center for Nanophase Materials Science, Oak Ridge National Laboratory, 37831, Oak Ridge, TN, USA
| | - Ciprian Iacob
- National Research and Development Institute for Cryogenic and Isotopic Technologies, ICSI Rm. Valcea, Rm. Valcea, Romania
- Karlsruhe Institute of Technology (KIT), Institute for Chemical Technology and Polymer Chemistry, 76128, Karlsruhe, Germany
| | - Joshua Sangoro
- Department of Chemical and Biomolecular Engineering, University of Tennessee, 37996, Knoxville, TN, USA.
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Parmentier A, Maccarini M, De Francesco A, Scaccia L, Rogati G, Czakkel O, De Luca F. Neutron spin echo monitoring of segmental-like diffusion of water confined in the cores of carbon nanotubes. Phys Chem Chem Phys 2019; 21:21456-21463. [PMID: 31535109 DOI: 10.1039/c9cp04248b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Following the stream of increasing scientific interest in condensed-matter systems under ultra-hydrophobic confinement, the present work reports the first incoherent neutron spin echo assessment of the dynamics of water axially confined inside single-wall carbon nanotubes of diameter d∼ 1.4 nm. At the time scale of nanoseconds, two water populations are retrieved, whose relative proportion matches the one expected for a concentric shell + chain arrangement with cylindrical symmetry. The time dependence of the mean square displacement related to the external component is found to be subdiffusive, with peculiar resemblance to segmental diffusion typical of entangled polymeric systems.
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Affiliation(s)
| | - Marco Maccarini
- Universitè Grenoble Alpes, Lab. TIMC/IMAG CNRS UMR 5525, La Tronche, 38700, France.
| | - Alessio De Francesco
- Consiglio Nazionale delle Ricerche, Istituto Officina dei Materiali, Operative Group in Grenoble (OGG), c/o Institut Laue Langevin, Grenoble, France
| | - Luisa Scaccia
- University of Macerata, Dept. of Economics and Law, 62100 Macerata, Italy
| | - Giovanna Rogati
- Sapienza University of Rome, Dept. of Physics, Rome, 00185, Italy
| | - Orsolya Czakkel
- Institut Laue-Langevin, CS 20156, 38042 Grenoble cedex 9, France
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Abstract
We review recent neutron scattering work and related results from simulation and complementary techniques focusing on the microscopic dynamics of polymers under confinement. Confinement is either realized in model porous materials or in polymer nanocomposites (PNC). The dynamics of such confined polymers is affected on the local segmental level, the level of entanglements as well as on global levels: (i) at the segmental level the interaction with the surface is of key importance. At locally repulsive surfaces compared to the bulk the segmental dynamics is not altered. Attractive surfaces slow down the segmental dynamics in their neighborhood but do not give rise to dead, glassy layers. (ii) Confinement generally has little effect on the inter-chain entanglements: both for weakly as well as for marginally confined polymers the reptation tube size is not changed. Only for strongly confined polymers disentanglement takes place. Similarly, in PNC at higher NP loading disentanglement phenomena are observed; in addition, at very high loading a transition from polymer caused topological constraints to purely geometrical constraints is observed. (iii) On the more global scale NSE experiments revealed important information on the nature of the interphase between adsorbed layer and bulk polymer. (iv) Polymer grafts at NP mutually confine each other, an effect that is most pronounced for one component NP. (v) Global diffusion of entangled polymers both in weakly and strongly attractive PNC is governed by the ratio of bottle-neck to chain size that characterizes the 'entropic barrier' for global diffusion.
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Affiliation(s)
- Dieter Richter
- Jülich Centre for Neutron Science (JCNS-1) and Institute of Complex Systems (ICS-1), Forschungszentrum Jülich GmbH, Jülich, Germany.
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Krutyeva M, Pasini S, Monkenbusch M, Allgaier J, Maiz J, Mijangos C, Hartmann-Azanza B, Steinhart M, Jalarvo N, Ivanova O, Holderer O, Radulescu A, Ohl M, Falus P, Unruh T, Richter D. Erratum: “Polymer dynamics under cylindrical confinement featuring a locally repulsive surface: A quasielastic neutron scattering study” [J. Chem. Phys. 146, 203306 (2017)]. J Chem Phys 2017; 146:209901. [DOI: 10.1063/1.4979809] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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