1
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Guo J, Yang Y, Xiang Y, Zhang S, Guo X. Application of smart hydrogel materials in cartilage injury repair: A systematic review and meta-analysis. J Biomater Appl 2024; 39:96-116. [PMID: 38708775 DOI: 10.1177/08853282241248779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/07/2024]
Abstract
OBJECTIVE Cartilage injury is a common clinical condition, and treatment approaches have evolved over time from traditional conservative and surgical methods to regenerative repair. In this context, hydrogels, as widely used biomaterials in the field of cartilage repair, have garnered significant attention. Particularly, responsive hydrogels (also known as "smart hydrogels") have shown immense potential due to their ability to respond to various physicochemical properties and environmental changes. This paper aims to review the latest research developments of hydrogels in cartilage repair, utilizing a more systematic and comprehensive meta-analysis approach to evaluate the research status and application value of responsive hydrogels. The goal is to determine whether these materials demonstrate favorable therapeutic effects for subsequent clinical applications, thereby offering improved treatment methods for patients with cartilage injuries. METHOD This study employed a systematic literature search method to summarize the research progress of responsive hydrogels by retrieving literature on the subject and review studies. The search terms included "hydrogel" and "cartilage," covering data from database inception up to October 2023. The quality of the literature was independently evaluated using Review Manager v5.4 software. Quantifiable data was statistically analyzed using the R language. RESULTS A total of 7 articles were retrieved for further meta-analysis. In the quality assessment, the studies demonstrated reliability and accuracy. The results of the meta-analysis indicated that responsive hydrogels exhibit unique advantages and effective therapeutic outcomes in the field of cartilage repair. Subgroup analysis revealed potential influences of factors such as different types of hydrogels and animal models on treatment effects. CONCLUSION Responsive hydrogels show significant therapeutic effects and substantial application potential in the field of cartilage repair. This study provides strong scientific evidence for their further clinical applications and research, with the hope of promoting advancements in the treatment of cartilage injuries.
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Affiliation(s)
- Juncheng Guo
- Central Laboratory of Haikou People's Hospital, Haikou Affiliated Hospital of Xiangya Medical College, Central South University, Haikou, P. R. China
| | - Yijun Yang
- Haikou People's Hospital, Xiangya School of Medicine, Haikou Affiliated Hospital of Central South University, Haikou, P. R. China
| | - Yang Xiang
- Haikou People's Hospital, Xiangya School of Medicine, Haikou Affiliated Hospital of Central South University, Haikou, P. R. China
| | - Shufang Zhang
- Central Laboratory, Haikou People's Hospital, Xiangya School of Medicine, Haikou Affiliated Hospital of Central South University, Haikou, P. R. China
| | - Xueyi Guo
- Central South University, Changsha, P. R. China
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2
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Bibire T, Dănilă R, Yilmaz CN, Verestiuc L, Nacu I, Ursu RG, Ghiciuc CM. In Vitro Biological Evaluation of an Alginate-Based Hydrogel Loaded with Rifampicin for Wound Care. Pharmaceuticals (Basel) 2024; 17:943. [PMID: 39065793 PMCID: PMC11280071 DOI: 10.3390/ph17070943] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2024] [Revised: 07/10/2024] [Accepted: 07/11/2024] [Indexed: 07/28/2024] Open
Abstract
We report a biocompatible hydrogel dressing based on sodium alginate-grafted poly(N-vinylcaprolactam) prepared by encapsulation of Rifampicin as an antimicrobial drug and stabilizing the matrix through the repeated freeze-thawing method. The hydrogel structure and polymer-drug compatibility were confirmed by FTIR, and a series of hydrogen-bond-based interactions between alginate and Rifampicin were identified. A concentration of 0.69% Rifampicin was found in the polymeric matrix using HPLC analysis and spectrophotometric UV-Vis methods. The hydrogel's morphology was evaluated by scanning electron microscopy, and various sizes and shapes of pores, ranging from almost spherical geometries to irregular ones, with a smooth surface of the pore walls and high interconnectivity in the presence of the drug, were identified. The hydrogels are bioadhesive, and the adhesion strength increased after Rifampicin was encapsulated into the polymeric matrix, which suggests that these compositions are suitable for wound dressings. Antimicrobial activity against S. aureus and MRSA, with an increased effect in the presence of the drug, was also found in the newly prepared hydrogels. In vitro biological evaluation demonstrated the cytocompatibility of the hydrogels and their ability to stimulate cell multiplication and mutual cell communication. The in vitro scratch assay demonstrated the drug-loaded alginate-grafted poly(N-vinylcaprolactam) hydrogel's ability to stimulate cell migration and wound closure. All of these results suggest that the prepared hydrogels can be used as antimicrobial materials for wound healing and care applications.
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Affiliation(s)
- Tudor Bibire
- Doctoral School, Grigore T. Popa University of Medicine and Pharmacy, 16 Universitatii Street, 700116 Iasi, Romania;
- St. Spiridon County Clinical Emergency Hospital, 1 Independentei Blvd., 700111 Iasi, Romania;
| | - Radu Dănilă
- St. Spiridon County Clinical Emergency Hospital, 1 Independentei Blvd., 700111 Iasi, Romania;
- Department of Surgery, Faculty of Medicine, Grigore T. Popa University of Medicine and Pharmacy, 16 Universitatii Street, 700116 Iasi, Romania
| | - Cătălina Natalia Yilmaz
- Biochemistry Division, Department of Chemistry, Faculty of Science, Dokuz Eylül University, Kültür Mah. Cumhuriyet Bulv. No:144 Alsancak, 35210 Izmir, Turkey
| | - Liliana Verestiuc
- Department of Biomedical Sciences, Faculty of Medical Bioengineering, Grigore T. Popa University of Medicine and Pharmacy, 16 Universitatii Street, 700116 Iasi, Romania;
| | - Isabella Nacu
- Department of Biomedical Sciences, Faculty of Medical Bioengineering, Grigore T. Popa University of Medicine and Pharmacy, 16 Universitatii Street, 700116 Iasi, Romania;
- Petru Poni Institute of Macromolecular Chemistry, 41-A Grigore Ghica Voda Alley, 700487 Iasi, Romania
| | - Ramona Gabriela Ursu
- Department of Microbiology, Faculty of Medicine, Grigore T. Popa University of Medicine and Pharmacy, 16 Universitatii Street, 700116 Iasi, Romania;
| | - Cristina Mihaela Ghiciuc
- Department of Pharmacology, Faculty of Medicine, Clinical Pharmacology and Algeziology, Grigore T. Popa University of Medicine and Pharmacy, 16 Universitatii Street, 700116 Iasi, Romania;
- St. Maria Clinical Emergency Hospital for Children, 62 Vasile Lupu Street, 700309 Iasi, Romania
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3
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Zhang F, Wang W, Zhao Y, He X. Dynamics and Internal Structure Evolution during the Glass Transition of the Ethylene-Cyclic Olefin Copolymers: A Molecular Dynamics Simulation. J Phys Chem B 2024; 128:5135-5146. [PMID: 38728026 DOI: 10.1021/acs.jpcb.4c01286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/24/2024]
Abstract
Amorphous ethylene-cyclic olefin copolymers (COCs) which can be used in cell phone lenses and prefilled syringes have attracted increasing attention due to their excellent and tunable thermal properties. In order to better explain the influence of COC microstructure (cyclic olefin types and content) on the glass transition mechanism, we used molecular dynamics (MD) simulations to track the evolution of free volume, diffusion coefficients, atomic mobility, trans conformation probabilities, and characteristic parameters of α-relaxation kinetics during the quenching process. MD results show that for the classic COC E-co-NB (ethylene-norbornene copolymer), an increase in cyclic olefin content from 25 to 50 mol % reduces atomic mobility, limiting the molecular chain movement at higher temperatures and improving Tg. Compared to NB, the more rigid rings in tricyclopentadiene (TCPD) and exo-1,4,4a,9,9a,10-hexahydro-9,10(1',2')-bridged phenylidene-1,4-bridged methylideneanthracene (HBM) have the following effects: (1) reducing the thermal expansion coefficient and overall chain mobility; (2) enhancing the diffusion energy barrier; (3) promoting the formation of local ordered structures; (4) accelerating α-relaxation dynamics at high temperatures and improving the dynamic fragility m. These lead to an upward shift in the temperature region where chain movement is limited and thus improve Tg and high-temperature dimensional stability. In this simulation, the correlation equation between Tg, m, and the microstructural parameters of COCs is established, which is of great significance for the development of COCs with high performance.
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Affiliation(s)
- Fan Zhang
- Shanghai Key Laboratory of Multiphase Material Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Wenhui Wang
- Shanghai Key Laboratory of Multiphase Material Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Yangyang Zhao
- Shanghai Key Laboratory of Multiphase Material Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Xuelian He
- Shanghai Key Laboratory of Multiphase Material Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
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4
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Xu X, Sarhan RM, Mei S, Kochovski Z, Koopman W, Priestley RD, Lu Y. Photothermally Triggered Nanoreactors with a Tunable Catalyst Location and Catalytic Activity. ACS APPLIED MATERIALS & INTERFACES 2023; 15:48623-48631. [PMID: 37807243 DOI: 10.1021/acsami.3c09657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/10/2023]
Abstract
Thermosensitive microgels based on poly(N-isopropylacrylamide) (PNIPAm) have been widely used to create nanoreactors with controlled catalytic activity through the immobilization of metal nanoparticles (NPs). However, traditional approaches with metal NPs located only in the polymer network rely on electric heating to initiate the reaction. In this study, we developed a photothermal-responsive yolk-shell nanoreactor with a tunable location of metal NPs. The catalytic performance of these nanoreactors can be controlled by both light irradiation and conventional heating, that is, electric heating. Interestingly, the location of the catalysts had a significant impact on the reduction kinetics of the nanoreactors; catalysts in the shell exhibited higher catalytic activity compared with those in the core, under conventional heating. When subjected to light irradiation, nanoreactors with catalysts loaded in the core demonstrated improved catalytic performance compared to direct heating, while nanoreactors with catalysts in the shell exhibited relatively similar activity. We attribute this enhancement in catalytic activity to the spatial distribution of the catalysts and the localized heating within the polydopamine cores of the nanoreactors. This research presents exciting prospects for the design of innovative smart nanoreactors and efficient photothermal-assisted catalysis.
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Affiliation(s)
- Xiaohui Xu
- Institutue of Soft Matter and Functional Materials, Helmholtz-Zentrum Berlin fur Materialien und Energie, Hahn-Meitner-Platz 1, Berlin 14109, Germany
- Department of Chemical and Biological Engineering, Princeton University, Princeton, New Jersey 08544, United States
| | - Radwan M Sarhan
- Institutue of Soft Matter and Functional Materials, Helmholtz-Zentrum Berlin fur Materialien und Energie, Hahn-Meitner-Platz 1, Berlin 14109, Germany
| | - Shilin Mei
- Institutue of Soft Matter and Functional Materials, Helmholtz-Zentrum Berlin fur Materialien und Energie, Hahn-Meitner-Platz 1, Berlin 14109, Germany
| | - Zdravko Kochovski
- Institutue of Soft Matter and Functional Materials, Helmholtz-Zentrum Berlin fur Materialien und Energie, Hahn-Meitner-Platz 1, Berlin 14109, Germany
| | - Wouter Koopman
- Institute of Physics and Astronomy, University of Potsdam, Potsdam 14467, Germany
| | - Rodney D Priestley
- Department of Chemical and Biological Engineering, Princeton University, Princeton, New Jersey 08544, United States
| | - Yan Lu
- Institutue of Soft Matter and Functional Materials, Helmholtz-Zentrum Berlin fur Materialien und Energie, Hahn-Meitner-Platz 1, Berlin 14109, Germany
- Institute of Chemistry, University of Potsdam, Potsdam 14467, Germany
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5
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Terada E, Isono T, Satoh T, Yamamoto T, Kakuchi T, Sato S. All-Atom Molecular Dynamics Simulations of the Temperature Response of Poly(glycidyl ether)s with Oligooxyethylene Side Chains Terminated with Alkyl Groups. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:nano13101628. [PMID: 37242043 DOI: 10.3390/nano13101628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Revised: 05/09/2023] [Accepted: 05/10/2023] [Indexed: 05/28/2023]
Abstract
Recently, experimental investigations of a class of temperature-responsive polymers tethered to oligooxyethylene side chains terminated with alkyl groups have been conducted. In this study, aqueous solutions of poly(glycidyl ether)s (PGE) with varying numbers of oxyethylene units, poly(methyl(oligooxyethylene)n glycidyl ether) (poly(Me(EO)nGE)), and poly(ethyl(oligooxyethylene)n glycidyl ether) (poly(Et(EO)nGE) (n = 0, 1, and 2) were investigated by all-atom molecular dynamics simulations, focusing on the thermal responses of their chain extensions, the recombination of intrapolymer and polymer-water hydrogen bonds, and water-solvation shells around the alkyl groups. No clear relationship was established between the phase-transition temperature and the polymer-chain extensions unlike the case for the coil-globule transition of poly(N-isopropylacrylamide). However, the temperature response of the first water-solvation shell around the alkyl group exhibited a notable correlation with the phase-transition temperature. In addition, the temperature at which the hydrophobic hydration shell strength around the terminal alkyl group equals the bulk water density (TCRP) was slightly lower than the cloud point temperature (TCLP) for the methyl-terminated poly(Me(EO)nGE) and slightly higher for the ethyl-terminated poly(Et(EO)nGE). It was concluded that the polymer-chain fluctuation affects the relationship between TCRP and TCLP.
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Affiliation(s)
- Erika Terada
- Graduate School of Chemical Science and Engineering, Hokkaido University, Sapporo 060-8628, Japan
| | - Takuya Isono
- Graduate School of Chemical Science and Engineering, Hokkaido University, Sapporo 060-8628, Japan
- Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan
| | - Toshifumi Satoh
- Graduate School of Chemical Science and Engineering, Hokkaido University, Sapporo 060-8628, Japan
- Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan
| | - Takuya Yamamoto
- Graduate School of Chemical Science and Engineering, Hokkaido University, Sapporo 060-8628, Japan
- Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan
| | - Toyoji Kakuchi
- Research Center for Polymer Materials, School of Materials Science and Engineering, Changchun University of Science and Technology, Weixing Road 7989, Changchun 130012, China
| | - Shinichiro Sato
- Graduate School of Chemical Science and Engineering, Hokkaido University, Sapporo 060-8628, Japan
- Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan
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6
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Synthesis and application of a temperature sensitive poly(N-vinylcaprolactam-co-N,N-diethyl acrylamide) for low-temperature rheology control of water-based drilling fluid. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.128855] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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7
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Yang Q, Li W, Stober ST, Burns AB, Gopinadhan M, Martini A. Effect of Aliphatic Chain Length on the Stress–Strain Response of Semiaromatic Polyamide Crystals. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c00081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Quanpeng Yang
- Department of Mechanical Engineering, University of California, Merced, 5200 N. Lake Road, Merced, California 95343, United States
| | - Wenjun Li
- Corporate Strategic Research, ExxonMobil Research and Engineering Company, 1545 Route 22 East, Annandale, New Jersey 08801, United States
| | - Spencer T. Stober
- Corporate Strategic Research, ExxonMobil Research and Engineering Company, 1545 Route 22 East, Annandale, New Jersey 08801, United States
| | - Adam B. Burns
- Corporate Strategic Research, ExxonMobil Research and Engineering Company, 1545 Route 22 East, Annandale, New Jersey 08801, United States
| | - Manesh Gopinadhan
- Corporate Strategic Research, ExxonMobil Research and Engineering Company, 1545 Route 22 East, Annandale, New Jersey 08801, United States
| | - Ashlie Martini
- Department of Mechanical Engineering, University of California, Merced, 5200 N. Lake Road, Merced, California 95343, United States
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8
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Rasouli S, Hashemianzadeh SM, Moghbeli MR. Role of physicochemical characteristics of poly(N,N-diethylacrylamide) on the polymer thermal responsivity and interfacial properties in aqueous solution: All-atom simulation study. J Mol Graph Model 2022; 112:108140. [DOI: 10.1016/j.jmgm.2022.108140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 01/15/2022] [Accepted: 01/24/2022] [Indexed: 11/26/2022]
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9
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Buglakov AI, Larin DE, Vasilevskaya VV. Orientation- and cosolvent-induced self-assembly of amphiphilic homopolymers in selective solvents. POLYMER 2021. [DOI: 10.1016/j.polymer.2021.124160] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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10
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Kadaoluwa Pathirannahalage SP, Meftahi N, Elbourne A, Weiss ACG, McConville CF, Padua A, Winkler DA, Costa Gomes M, Greaves TL, Le TC, Besford QA, Christofferson AJ. Systematic Comparison of the Structural and Dynamic Properties of Commonly Used Water Models for Molecular Dynamics Simulations. J Chem Inf Model 2021; 61:4521-4536. [PMID: 34406000 DOI: 10.1021/acs.jcim.1c00794] [Citation(s) in RCA: 64] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Water is a unique solvent that is ubiquitous in biology and present in a variety of solutions, mixtures, and materials settings. It therefore forms the basis for all molecular dynamics simulations of biological phenomena, as well as for many chemical, industrial, and materials investigations. Over the years, many water models have been developed, and it remains a challenge to find a single water model that accurately reproduces all experimental properties of water simultaneously. Here, we report a comprehensive comparison of structural and dynamic properties of 30 commonly used 3-point, 4-point, 5-point, and polarizable water models simulated using consistent settings and analysis methods. For the properties of density, coordination number, surface tension, dielectric constant, self-diffusion coefficient, and solvation free energy of methane, models published within the past two decades consistently show better agreement with experimental values compared to models published earlier, albeit with some notable exceptions. However, no single model reproduced all experimental values exactly, highlighting the need to carefully choose a water model for a particular study, depending on the phenomena of interest. Finally, machine learning algorithms quantified the relationship between the water model force field parameters and the resulting bulk properties, providing insight into the parameter-property relationship and illustrating the challenges of developing a water model that can accurately reproduce all properties of water simultaneously.
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Affiliation(s)
- Sachini P Kadaoluwa Pathirannahalage
- School of Science, RMIT University, Melbourne, Victoria 3000, Australia.,Laboratoire de Chimie, Ecole Normale Supérieure de Lyon, CNRS, Lyon 69342, France
| | - Nastaran Meftahi
- ARC Centre of Excellence in Exciton Science, School of Science, RMIT University, Melbourne, Victoria 3000, Australia
| | - Aaron Elbourne
- School of Science, RMIT University, Melbourne, Victoria 3000, Australia
| | - Alessia C G Weiss
- Leibniz-Institut für Polymerforschung e.V., Hohe Straße 6, 01069 Dresden, Germany
| | - Chris F McConville
- School of Science, RMIT University, Melbourne, Victoria 3000, Australia.,Institute for Frontier Materials, Deakin University, Geelong, Victoria 3220, Australia
| | - Agilio Padua
- Laboratoire de Chimie, Ecole Normale Supérieure de Lyon, CNRS, Lyon 69342, France
| | - David A Winkler
- School of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Bundoora, Victoria 3086, Australia.,Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Victoria 3052, Australia.,School of Pharmacy, University of Nottingham, Nottingham NG7 2QL, U.K
| | | | - Tamar L Greaves
- School of Science, RMIT University, Melbourne, Victoria 3000, Australia
| | - Tu C Le
- School of Engineering, RMIT University, Melbourne, Victoria 3001, Australia
| | - Quinn A Besford
- Leibniz-Institut für Polymerforschung e.V., Hohe Straße 6, 01069 Dresden, Germany
| | - Andrew J Christofferson
- School of Science, RMIT University, Melbourne, Victoria 3000, Australia.,ARC Centre of Excellence in Exciton Science, School of Science, RMIT University, Melbourne, Victoria 3000, Australia
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11
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Dittrich J, Kather M, Holzberger A, Pich A, Gohlke H. Cumulative Submillisecond All-Atom Simulations of the Temperature-Induced Coil-to-Globule Transition of Poly(N-vinylcaprolactam) in Aqueous Solution. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c01896] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Jonas Dittrich
- Institute for Pharmaceutical and Medicinal Chemistry, Heinrich Heine University Düsseldorf, 40225 Düsseldorf, Germany
- Bioeconomy Science Center (BioSC), Forschungszentrum Jülich, 52425 Jülich, Germany
| | - Michael Kather
- DWI-Leibniz-Institute for Interactive Materials, RWTH Aachen University, 52056 Aachen, Germany
- Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, 52074 Aachen, Germany
| | - Anna Holzberger
- DWI-Leibniz-Institute for Interactive Materials, RWTH Aachen University, 52056 Aachen, Germany
- Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, 52074 Aachen, Germany
| | - Andrij Pich
- Bioeconomy Science Center (BioSC), Forschungszentrum Jülich, 52425 Jülich, Germany
- DWI-Leibniz-Institute for Interactive Materials, RWTH Aachen University, 52056 Aachen, Germany
- Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, 52074 Aachen, Germany
| | - Holger Gohlke
- Institute for Pharmaceutical and Medicinal Chemistry, Heinrich Heine University Düsseldorf, 40225 Düsseldorf, Germany
- Bioeconomy Science Center (BioSC), Forschungszentrum Jülich, 52425 Jülich, Germany
- John von Neumann Institute for Computing (NIC), Jülich Supercomputing Centre (JSC), Institute of Biological Information Processing (IBI-7: Structural Biochemistry), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
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12
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Monitoring phase transition behavior of Poly(N-vinylcaprolactam) via nanostructure-based functionalized carbon nanotubes. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.114062] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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13
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Quoika PK, Podewitz M, Wang Y, Kamenik AS, Loeffler JR, Liedl KR. Thermosensitive Hydration of Four Acrylamide-Based Polymers in Coil and Globule Conformations. J Phys Chem B 2020; 124:9745-9756. [PMID: 33054215 PMCID: PMC7604866 DOI: 10.1021/acs.jpcb.0c07232] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
![]()
To
characterize the thermosensitive coil–globule transition in
atomistic detail, the conformational dynamics of linear polymer chains
of acrylamide-based polymers have been investigated at multiple temperatures.
Therefore, molecular dynamic simulations of 30mers of polyacrylamide
(AAm), poly-N-methylacrylamide (NMAAm), poly-N-ethylacrylamide (NEAAm), and poly-N-isopropylacrylamide
(NIPAAm) have been performed at temperatures ranging from 250 to 360
K for 2 μs. While two of the polymers are known to exhibit thermosensitivity
(NEAAm, NIPAAm), no thermosensitivity is observed for AAm and NMAAm
in aqueous solution. Our computer simulations consistently reproduce
these properties. To understand the thermosensitivity of the respective
polymers, the conformational ensembles at different temperatures have
been separated according to the coil–globule transition. The
coil and globule conformational ensembles were exhaustively analyzed
in terms of hydrogen bonding with the solvent, the change of the solvent
accessible surface, and enthalpic contributions. Surprisingly, independent
of different thermosensitive properties of the four polymers, the
surface affinity to water of coil conformations is higher than for
globule conformations. Therefore, polymer–solvent interactions
stabilize coil conformations at all temperatures. Nevertheless, the
enthalpic contributions alone cannot explain the differences in thermosensitivity.
This clearly implies that entropy is the distinctive factor for thermosensitivity.
With increasing side chain length, the lifetime of the hydrogen bonds
between the polymer surface and water is extended. Thus, we surmise
that a longer side chain induces a larger entropic penalty due to
immobilization of water molecules.
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Affiliation(s)
- Patrick K Quoika
- Institute of General, Inorganic and Theoretical Chemistry, and Centre of Molecular Biosciences University of Innsbruck, Innsbruck, A-6020 Austria
| | - Maren Podewitz
- Institute of General, Inorganic and Theoretical Chemistry, and Centre of Molecular Biosciences University of Innsbruck, Innsbruck, A-6020 Austria
| | - Yin Wang
- Institute of General, Inorganic and Theoretical Chemistry, and Centre of Molecular Biosciences University of Innsbruck, Innsbruck, A-6020 Austria
| | - Anna S Kamenik
- Institute of General, Inorganic and Theoretical Chemistry, and Centre of Molecular Biosciences University of Innsbruck, Innsbruck, A-6020 Austria
| | - Johannes R Loeffler
- Institute of General, Inorganic and Theoretical Chemistry, and Centre of Molecular Biosciences University of Innsbruck, Innsbruck, A-6020 Austria
| | - Klaus R Liedl
- Institute of General, Inorganic and Theoretical Chemistry, and Centre of Molecular Biosciences University of Innsbruck, Innsbruck, A-6020 Austria
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14
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Rasouli S, Moghbeli MR, Nikkhah SJ. Molecular dynamics simulation of polystyrene copolymer with octyl short-chain branches in toluene. J Mol Model 2020; 26:80. [PMID: 32180007 DOI: 10.1007/s00894-020-4339-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Accepted: 03/04/2020] [Indexed: 11/28/2022]
Abstract
In this study, dimensional, conformational and dynamic behaviors of a short-chain branched styrene/1-octene copolymer chain with different 1-octene percentages, i.e., 0, 2, 4 and 6%, in toluene are investigated at the temperature of 298.15 K via molecular dynamics simulation. The chain dimensions and flexibility in the solvent are evaluated by calculating the radius of gyration (Rg), end-to-end distance (<r0>), surface area (Ach), and volume (Vch) of the copolymer chain. The mean square displacement (MSD) and diffusivity coefficient for each copolymer chain are measured to determine its dynamic behavior and mobility in aromatic media. To consider the effect of increasing the 1-octene co-monomer percentage on the copolymer chain affinity to the solvent molecules, the interaction energy (Eint) and Flory-Huggins (FH) interaction parameter are calculated for each equilibrated solution model. The simulation results indicate that the co-monomer level increment in the copolymer structure reduces the chain Rg amount and its interaction with the solvent. The <r0> of the chain increases up to 4% co-monomer content, while further co-monomer content decreases the <r0> value. Additionally, the viscosity of the equilibrated dilute solutions is calculated via non-equilibrium molecular dynamics simulation (NEMD). Moreover, the steric hindrance of the copolymers and the solvent molecules capturing in the dilute solution is determined via radial distribution function (RDF) analysis. Helmholtz free energy and the system entropy changes are calculated to evaluate the tendency of the copolymer to the solvent molecules and its dilute solution irregularity, respectively. Graphical abstract The figure shows the variations trend of the poly(styrene-co-1-octene) chain dimensions in toluene aromatic solvent by increasing the 1-octene content (x), after the equilibration state. Red and blue colors represent the carbon atoms of the copolymer chain backbone and 1-octene side chains, respectively. The styrene rings and the hydrogen atoms of the chains were removed for better view.
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Affiliation(s)
- Sajad Rasouli
- Smart Polymers and Nanocomposites Research Group, School of Chemical Engineering, Iran University of Science and Technology, Tehran, 16846-13114, Iran
| | - Mohammad Reza Moghbeli
- Smart Polymers and Nanocomposites Research Group, School of Chemical Engineering, Iran University of Science and Technology, Tehran, 16846-13114, Iran.
| | - Sousa Javan Nikkhah
- Smart Polymers and Nanocomposites Research Group, School of Chemical Engineering, Iran University of Science and Technology, Tehran, 16846-13114, Iran
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Mochizuki K. Reduction of water-mediated repulsion drives poly(N-vinylcaprolactam) collapse upon heating. Phys Chem Chem Phys 2020; 22:1053-1060. [PMID: 31867584 DOI: 10.1039/c9cp05491j] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Thermo-sensitive aqueous polymers undergo a coil-to-globule transition on heating, with drastic chemical and structural changes. We performed molecular dynamics simulations for PVCL in water to study the driving forces for the polymer's collapse.
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Affiliation(s)
- Kenji Mochizuki
- Department of Chemistry and Materials
- Faculty of Textile Science and Technology
- Shinshu University
- Nagano 386-8567
- Japan
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