1
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Fang L, Hu Y, Lin Z, Ren Y, Liu X, Gong J. Instant mucus dressing of PEO reinforced by chitosan nanofiber scaffold for open wound healing. Int J Biol Macromol 2024; 263:130512. [PMID: 38423418 DOI: 10.1016/j.ijbiomac.2024.130512] [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] [Received: 11/01/2023] [Revised: 02/14/2024] [Accepted: 02/26/2024] [Indexed: 03/02/2024]
Abstract
Dressings seamlessly attached to the open wound bed are necessary for fully unleashing the dressing healing ability, as leaving the voids beneath the dressing poses infection hazards. The present study prepared an instant mucus dressing (IMD) of polyethylene oxide (PEO) reinforced by chitosan (CS) nanofiber scaffold, which formed by immersing PEO/CS nanofiber mat in water. The PEO/CS nanofiber mat were fabricated by the solution blow spinning (SBS) method using PEO and CS mixed solutions. Attenuated total reflection Fourier transform infrared spectroscopy (FTIR-ATR), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and differential scan calorimetry (DSC) analyses indicate that PEO macromolecules formed the most of nanofiber shell due to their lower surface tension while CS macromolecules stayed mainly inside the fiber as the core. When such a PEO/CS nanofiber mat was immersed in water, PEO swelled to form mucus dressing reinforced by CS inside the nanofiber, which was fluidic and able to fully fill the voids on the wound. In vivo rat experiment verified that the dressing significantly accelerated the open wound healing through seamlessly attaching of mucus to the open wound and providing moist environment. The dressings exhibit good platelets and whole blood cells adhesion properties, excellent hemostasis function and no cytotoxicity. This instant mucus dressing provided a new perspective for manufacturing high performance open wound dressings.
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Affiliation(s)
- Lei Fang
- School of Textile Science and Engineering, Tiangong University, 399 Binshui West Road, Tianjin 300387, China.
| | - Yanling Hu
- Traumatology Department, Affiliated Hospital of Qingdao University, 59 Haier Road, Qingdao 266071, China.
| | - Zhihao Lin
- Traumatology Department, Affiliated Hospital of Qingdao University, 59 Haier Road, Qingdao 266071, China
| | - Yanfei Ren
- College of Textiles & Clothing, Qingdao University, 308 Ningxia Road, Qingdao 266071, China
| | - Xiuming Liu
- School of Textile Science and Engineering, Tiangong University, 399 Binshui West Road, Tianjin 300387, China.
| | - Jixian Gong
- School of Textile Science and Engineering, Tiangong University, 399 Binshui West Road, Tianjin 300387, China.
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2
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Shandiz SA, Leuty GM, Guo H, Mokarizadeh AH, Maia JM, Tsige M. Structure and Thermodynamics of Linear, Ring, and Catenane Polymers in Solutions and at Liquid-Liquid Interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:7154-7166. [PMID: 37155243 DOI: 10.1021/acs.langmuir.3c00589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
In recent decades, advances in the syntheses of mechanically interlocked macromolecules, such as catenanes, have led to much greater interest in the applications of these complexes, from molecular motors and actuators to nanoscale computational memory and nanoswitches. Much remains to be understood, however, regarding how catenated ring compounds behave as a result of the effects of different solvents as well as the effects of solvent/solvent interfaces. In this work, we have investigated, using molecular dynamics simulations, the effects of solvation of poly(ethylene oxide) chains of different topologies─linear, ring, and [2]catenane─in two solvents both considered favorable toward PEO (water, toluene) and at the water/toluene interface. Compared to ring and [2]catenane molecules, the linear PEO chain showed the largest increase in size at the water/toluene interface compared to bulk water or bulk toluene. Perhaps surprisingly, observations indicate that the tendency of all three topologies to extend at the water/toluene interface may have more to do with screening the interaction between the two solvents than with optimizing specific solvent-polymer contacts.
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Affiliation(s)
- Saeed Akbari Shandiz
- Department of Macromolecular Science & Engineering, Case Western Reserve University, Cleveland Ohio 44106, United States
| | - Gary M Leuty
- LinQuest Corporation, Beavercreek, Ohio 45431, United States
| | - Hao Guo
- School of Polymer Science and Polymer Engineering, The University of Akron, Akron, Ohio 44325, United States
| | - Abdol Hadi Mokarizadeh
- School of Polymer Science and Polymer Engineering, The University of Akron, Akron, Ohio 44325, United States
| | - Joao M Maia
- Department of Macromolecular Science & Engineering, Case Western Reserve University, Cleveland Ohio 44106, United States
| | - Mesfin Tsige
- School of Polymer Science and Polymer Engineering, The University of Akron, Akron, Ohio 44325, United States
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3
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Kambar N, Leal C. Microfluidic synthesis of multilayered lipid-polymer hybrid nanoparticles for the formulation of low solubility drugs. SOFT MATTER 2023; 19:1596-1605. [PMID: 36752169 PMCID: PMC10080587 DOI: 10.1039/d2sm01443b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Hybrid phospholipid/block copolymer membranes where polymers and lipids are molecularly mixed or phase-separated into polymer-rich and lipid-rich domains are promising drug delivery materials. Harnessing the chemical diversity of polymers and the biocompatability of lipids is a compelling approach to design the next generation of drug carriers. Here, we report on the development of a microfluidics-based strategy analogous to produce lipid nanoparticles (LNPs) for the nanomanufacturing of multilayered hybrid nanoparticles (HNPs). Using X-ray scattering, Cryo-electron, and polarized microscopy we show that phosphatidylcholine (PC) and PBD-b-PEO (poly(butadiene-block-ethylene oxide)) hybrid membranes can be nanomanufactured by microfluidics into HNPs with dense and multilayered cores which are ideal carriers of low-solubility drugs of the Biopharmaceutical Classification System (BCS) II and IV such as antimalarial DSM265 and Paclitaxel, respectively.
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Affiliation(s)
- Nurila Kambar
- Department of Materials Science and Engineering, University of Illinois Urbana-Champaign, Urbana, Illinois, USA.
| | - Cecília Leal
- Department of Materials Science and Engineering, University of Illinois Urbana-Champaign, Urbana, Illinois, USA.
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4
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Khechine E, Noack S, Schlaad H, Xu J, Reiter G, Reiter R. Reversible Dehydration-Hydration of Poly(ethylene glycol) in Langmuir Monolayers of a Diblock Copolymer Inferred from Changes in Filament Curvature. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:2710-2718. [PMID: 36757479 DOI: 10.1021/acs.langmuir.2c03179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
We investigated changes in the hydration state of poly(ethylene glycol) (PEG) through morphological changes in Langmuir monolayers of a PEG-poly(l-lactide) (PlLA) (PEG-b-PlLA) diblock copolymer. When the PEG blocks were hydrated, we observed a remarkable morphology of bundles of ring-like filaments, arranged concentrically, yielding densely packed disk-like objects with a hollow center. We attribute the uniform curvature of these filaments to a strong mismatch between the molecular volumes occupied by PlLA blocks and hydrated PEG blocks. Under the constraint that each hydrated PEG block is attached to a hydrophobic PlLA block anchored to the air-water interface, this mismatch of molecular volumes caused strong repulsion within the PEG layer, in particular when the PlLA blocks packed tightly. Induced by a transition in the ordering of the PlLA blocks, the PEG blocks lost their hydration shell and packed into a dense polymer brush, accompanied by a reduction of the pressure within the PEG layer. During this packing process, the curvature of the filaments was eliminated and the ring-like filaments fractured into small linear pieces. Upon compression, the linear pieces coalesced and formed long filaments aligned in parallel. Importantly, upon expansion of the Langmuir film, these changes in morphology were reversible, and the PEG blocks could be rehydrated and bundles of concentrically arranged ring-like filaments were reformed. We conclude that the change in curvature of the filaments provides a means for distinguishing between the hydrated and dehydrated states of PEG.
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Affiliation(s)
- Emna Khechine
- Institute of Physics, University of Freiburg, Hermann-Herder Street 3, 79104 Freiburg, Germany
| | - Sebastian Noack
- Institute of Chemistry, University of Potsdam, Karl-Liebknecht Street 24-25, 14476 Potsdam, Germany
| | - Helmut Schlaad
- Institute of Chemistry, University of Potsdam, Karl-Liebknecht Street 24-25, 14476 Potsdam, Germany
| | - Jun Xu
- Advanced Materials Laboratory of Ministry of Education, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Günter Reiter
- Institute of Physics, University of Freiburg, Hermann-Herder Street 3, 79104 Freiburg, Germany
| | - Renate Reiter
- Institute of Physics, University of Freiburg, Hermann-Herder Street 3, 79104 Freiburg, Germany
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5
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Dahanayake R, Dormidontova EE. Molecular Structure and Co-solvent Distribution in PPO–PEO and Pluronic Micelles. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c01206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Rasika Dahanayake
- Polymer Program, Institute of Materials Science and Department of Physics, University of Connecticut, Storrs, Connecticut06269, United States
| | - Elena E. Dormidontova
- Polymer Program, Institute of Materials Science and Department of Physics, University of Connecticut, Storrs, Connecticut06269, United States
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6
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Bello UY, Kumar S, Singh PK, Kakroo S, Madkhli AY, Singh S, Faiz Norrahim MN, Singh A. Insight into the use of ionic liquid-based polymer electrolyte for super capacitor application (RAFM-2022). HIGH PERFORM POLYM 2022. [DOI: 10.1177/09540083221111030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
In this study, we are presenting the recent progress toward PEO-based polymer electrolytes doped with low viscosity ionic liquids with a strong emphasis on ionic liquid doped-in polymer electrolytes for energy storage applications, particularly towards electric double layer capacitors. The reliable transmission mechanism suggested by previous researchers to address the increasing trend in transport properties is ascertained with a sharp sense of the presence of different concentrations of interaction, i.e. polymer ionic liquid was also presented in detail.
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Affiliation(s)
| | - Sushant Kumar
- COE on Solar Cells and Renewable Energy, Department of Physics, Sharda University, India
| | - Pramod K Singh
- COE on Solar Cells and Renewable Energy, Department of Physics, Sharda University, India
| | - Sunanda Kakroo
- Faculty of Science,Department of Physics, Jazan University, Jazan, Saudi Arabia
| | - Aysh Y Madkhli
- Faculty of Science,Department of Physics, Jazan University, Jazan, Saudi Arabia
| | - Shruti Singh
- COE on Solar Cells and Renewable Energy, Department of Physics, Sharda University, India
| | - Mohd N Faiz Norrahim
- Research Centre for Chemical Defence, Universiti Pertahanan Nasional Malaysia, Kuala Lumpur, Malaysia
| | - Abhimanyu Singh
- Department of Applied Physics, Gautam Buddha University, Greater Noida, India
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7
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Bratasyuk NA, Ostanin SA, Mokeev MV, Zuev VV. Water transport in epoxy/polyurethane interpenetrating networks. POLYM ADVAN TECHNOL 2022. [DOI: 10.1002/pat.5769] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | | | - Maxim V. Mokeev
- Institute of Macromolecular Compounds of the Russian Academy of Sciences Saint Petersburg Russia
| | - Vjacheslav V. Zuev
- ITMO University Saint Petersburg Russia
- Institute of Macromolecular Compounds of the Russian Academy of Sciences Saint Petersburg Russia
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8
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Bessif B, Pfohl T, Heck B, Alshetwi Y, Khechine E, Xu J, Reiter G. In Situ Dissolution and Swelling of Confined Lamellar Polymer Crystals through Exposure to Humid Air. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c00496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Brahim Bessif
- Physikalisches Institut, Albert-Ludwigs-Universität, 79104 Freiburg, Germany
| | - Thomas Pfohl
- Physikalisches Institut, Albert-Ludwigs-Universität, 79104 Freiburg, Germany
| | - Barbara Heck
- Physikalisches Institut, Albert-Ludwigs-Universität, 79104 Freiburg, Germany
| | - Yaser Alshetwi
- Physikalisches Institut, Albert-Ludwigs-Universität, 79104 Freiburg, Germany
| | - Emna Khechine
- Physikalisches Institut, Albert-Ludwigs-Universität, 79104 Freiburg, Germany
| | - Jun Xu
- Institute of Polymer Science and Engineering, Department of Chemical Engineering, Tsinghua University, 100084 Beijing, China
| | - Günter Reiter
- Physikalisches Institut, Albert-Ludwigs-Universität, 79104 Freiburg, Germany
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9
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Co-solvent and temperature effect on conformation and hydration of polypropylene and polyethylene oxides in aqueous solutions. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119774] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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10
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Nyambura CW, Sampath J, Nance E, Pfaendtner J. Exploring structure and dynamics of the polylactic‐co‐glycolic acid–polyethylene glycol copolymer and its homopolymer constituents in various solvents using all‐atom molecular dynamics. J Appl Polym Sci 2022. [DOI: 10.1002/app.52732] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Chris W. Nyambura
- Department of Chemical Engineering University of Washington Seattle Washington USA
| | - Janani Sampath
- Department of Chemical Engineering University of Florida Gainesville Florida USA
| | - Elizabeth Nance
- Department of Chemical Engineering University of Washington Seattle Washington USA
| | - Jim Pfaendtner
- Department of Chemical Engineering University of Washington Seattle Washington USA
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11
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Chen G, Dormidontova E. PEO-Grafted Gold Nanopore: Grafting Density, Chain Length, and Curvature Effects. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c00323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Guang Chen
- Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Elena Dormidontova
- Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
- Department of Physics, University of Connecticut, Storrs, Connecticut 06269, United States
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12
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Li S, Cui R, Yu C, Zhou Y. Coarse-Grained Model of Thiol-Epoxy-Based Alternating Copolymers in Explicit Solvents. J Phys Chem B 2022; 126:1830-1841. [PMID: 35179028 DOI: 10.1021/acs.jpcb.1c09406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The cosolvent method has been widely used in the self-assembly of amphiphilic alternating copolymers (ACPs), but the role of good and selective solvents is rarely investigated. Here, we have developed a coarse-grained (CG) model for the widely studied thiol-epoxy-based amphiphilic ACPs and a three-bead CG model for tetrahydrofuran (THF) as the good solvent, which is compatible with the MARTINI water model. The accuracy of both the CG polymer and THF models was validated by reproducing the structural and thermodynamic properties obtained from experiments or atomistic simulation results. Density in bulk, the radius of gyration, and solvation free energy in water or THF showed a good agreement between CG and atomistic models. The CG models were further employed to explore the self-assembly of ACPs in THF/water mixtures with different compositions. Chain folding and liquid-liquid phase separation behaviors were found with increasing water fractions, which were the key steps of the self-assembly process. This work will provide a basic platform to explore the self-assembly of amphiphilic ACPs in solvent mixtures and to reveal the real role of different solvents in self-assembly.
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Affiliation(s)
- Shanlong Li
- School of Chemistry & Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Rui Cui
- School of Chemistry & Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Chunyang Yu
- School of Chemistry & Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Yongfeng Zhou
- School of Chemistry & Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai 200240, China
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13
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Dahanayake R, Dormidontova EE. Hydrogen Bonding Sequence Directed Coil-Globule Transition in Water Soluble Thermoresponsive Polymers. PHYSICAL REVIEW LETTERS 2021; 127:167801. [PMID: 34723603 DOI: 10.1103/physrevlett.127.167801] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Accepted: 09/15/2021] [Indexed: 06/13/2023]
Abstract
The origin of the coil-globule transition for water-soluble thermoresponsive polymers frequently used in nanomaterials remains elusive. Using polypropylene oxide as an example we demonstrate by means of atomistic molecular dynamics simulations that temperature-induced increase in the sequence length of monomers that are not hydrogen bonded to water drives the coil-globule transition. Longer chains statistically exhibit longer sequences which serve as nucleation sites for hydrophobic cluster formation, facilitating chain collapse at lower temperature in agreement with experimental data.
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Affiliation(s)
- Rasika Dahanayake
- Polymer Program, Institute of Materials Science and Physics Department, University of Connecticut, Storrs, Connecticut 06269, USA
| | - Elena E Dormidontova
- Polymer Program, Institute of Materials Science and Physics Department, University of Connecticut, Storrs, Connecticut 06269, USA
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14
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Kangarlou B, Dahanayake R, Martin IJ, Ndaya D, Wu CM, Kasi RM, Dormidontova EE, Nieh MP. Flower-like Micelles of Polyethylene Oxide End-Capped with Cholesterol. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c00896] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Behrad Kangarlou
- Materials Science Program, Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Rasika Dahanayake
- Department of Physics, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Ian J. Martin
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Dennis Ndaya
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Chun-Ming Wu
- The Australian Nuclear Science and Technology Organisation, New Illawarra Road, Lucas Heights, New South Wales 2234, Australia
| | - Rajeswari M. Kasi
- Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Elena E. Dormidontova
- Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
- Department of Physics, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Mu-Ping Nieh
- Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
- Department of Chemical and Biomolecular Engineering, University of Connecticut, Storrs, Connecticut 06269, United States
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15
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Sherck N, Webber T, Brown DR, Keller T, Barry M, DeStefano A, Jiao S, Segalman RA, Fredrickson GH, Shell MS, Han S. End-to-End Distance Probability Distributions of Dilute Poly(ethylene oxide) in Aqueous Solution. J Am Chem Soc 2020; 142:19631-19641. [DOI: 10.1021/jacs.0c08709] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Nicholas Sherck
- Department of Chemical Engineering, University of California, Santa Barbara, California 93106, United States
| | - Thomas Webber
- Department of Chemical Engineering, University of California, Santa Barbara, California 93106, United States
| | - Dennis Robinson Brown
- Department of Chemical Engineering, University of California, Santa Barbara, California 93106, United States
| | - Timothy Keller
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
| | - Mikayla Barry
- Department of Materials, University of California, Santa Barbara, California 93106, United States
| | - Audra DeStefano
- Department of Chemical Engineering, University of California, Santa Barbara, California 93106, United States
| | - Sally Jiao
- Department of Chemical Engineering, University of California, Santa Barbara, California 93106, United States
| | - Rachel A. Segalman
- Department of Chemical Engineering, University of California, Santa Barbara, California 93106, United States
- Department of Materials, University of California, Santa Barbara, California 93106, United States
| | - Glenn H. Fredrickson
- Department of Chemical Engineering, University of California, Santa Barbara, California 93106, United States
- Department of Materials, University of California, Santa Barbara, California 93106, United States
- Materials Research Laboratory, University of California, Santa Barbara, California 93106, United States
| | - M. Scott Shell
- Department of Chemical Engineering, University of California, Santa Barbara, California 93106, United States
| | - Songi Han
- Department of Chemical Engineering, University of California, Santa Barbara, California 93106, United States
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
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16
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Donets S, Guskova O, Sommer JU. Flow-Induced Formation of Thin PEO Fibers in Water and Their Stability After the Strain Release. J Phys Chem B 2020; 124:9224-9229. [PMID: 32935989 DOI: 10.1021/acs.jpcb.0c05627] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Recently, we have shown that a tensile stress applied to chains of poly(ethylene oxide) (PEO) in water reduces the solubility and leads to phase separation of PEO chains from water with the formation of a two-phase region. In this work, we further elucidate the generic mechanism behind strain-induced phase transitions in aqueous PEO solutions with concentrations of 50-60 wt % by performing all-atom molecular dynamics simulations. In particular, we study the stability of oriented PEO fibers after removing stretching forces. We found that the size of the PEO bundle increased with time, which is associated with the dissolution of PEO chains on the fiber surface due to the reformation of hydrogen bonds between the outer PEO molecules and water. For precise characterization of the fibers, the scattering patterns (small- and wide-angle X-ray spectra) for configurations taken at different relaxation times are calculated. The tendency of the oligomer chains to be peeled off from the surface of the bundle eventually might lead to a complete dissolution of the PEO fiber. We conclude that either entanglement constraints or a quick drying process are necessary to conserve the fiber structure in a quiescent state. The scattering results show that external strain induced a liquid-liquid phase separation first. On long time scales, this can be a precursor for crystallization of the fiber.
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Affiliation(s)
- Sergii Donets
- Institute Theory of Polymers, Leibniz Institute of Polymer Research Dresden, Hohe Str. 6, 01069 Dresden, Germany
| | - Olga Guskova
- Institute Theory of Polymers, Leibniz Institute of Polymer Research Dresden, Hohe Str. 6, 01069 Dresden, Germany.,Dresden Center for Computational Materials Science (DCMS), Technische Universität Dresden, 01062 Dresden, Germany
| | - Jens-Uwe Sommer
- Institute Theory of Polymers, Leibniz Institute of Polymer Research Dresden, Hohe Str. 6, 01069 Dresden, Germany.,Institute of Theoretical Physics, Technische Universität Dresden, Zellescher Weg 17, 01069 Dresden, Germany
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17
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Dahal U, Dormidontova EE. Chain Conformation and Hydration of Polyethylene Oxide Grafted to Gold Nanoparticles: Curvature and Chain Length Effect. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c01499] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Udaya Dahal
- Polymer Program, Institute of Materials Science and Physics Department, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Elena E. Dormidontova
- Polymer Program, Institute of Materials Science and Physics Department, University of Connecticut, Storrs, Connecticut 06269, United States
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18
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Dunderdale GJ, Davidson SJ, Ryan AJ, Mykhaylyk OO. Flow-induced crystallisation of polymers from aqueous solution. Nat Commun 2020; 11:3372. [PMID: 32632091 PMCID: PMC7338548 DOI: 10.1038/s41467-020-17167-8] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2019] [Accepted: 06/16/2020] [Indexed: 11/21/2022] Open
Abstract
Synthetic polymers are thoroughly embedded in the modern society and their consumption grows annually. Efficient routes to their production and processing have never been more important. In this respect, silk protein fibrillation is superior to conventional polymer processing, not only by achieving outstanding physical properties of materials, such as high tensile strength and toughness, but also improved process energy efficiency. Natural silk solidifies in response to flow of the liquid using conformation-dependent intermolecular interactions to desolvate (denature) protein chains. This mechanism is reproduced here by an aqueous poly(ethylene oxide) (PEO) solution, which solidifies at ambient conditions when subjected to flow. The transition requires that an energy threshold is exceeded by the flow conditions, which disrupts a protective hydration shell around polymer molecules, releasing them from a metastable state into the thermodynamically favoured crystalline state. This mechanism requires vastly lower energy inputs and demonstrates an alternative route for polymer processing.
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Affiliation(s)
- Gary J Dunderdale
- Department of Chemistry, The University of Sheffield, Sheffield, S3 7HF, UK
| | - Sarah J Davidson
- Department of Chemistry, The University of Sheffield, Sheffield, S3 7HF, UK
- Croda International Plc, Snaith, Goole, DN14 9AA, UK
| | - Anthony J Ryan
- Department of Chemistry, The University of Sheffield, Sheffield, S3 7HF, UK
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19
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Manilo MV, Lebovka NI, Barany S. Electrokinetic Behavior of Laponite RD in Aqueous Suspensions Containing Poly(ethylene oxide) and Cetyltrimethylammonium Bromide. J Phys Chem B 2020; 124:4372-4378. [PMID: 32364739 DOI: 10.1021/acs.jpcb.0c02782] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
The aqueous suspensions of Laponite RD (Lap) platelets demonstrate rich phase diagrams. Both poly(ethylene oxide) (PEO) and cetyltrimethylammonium bromide (CTAB) molecules competitively adsorb on the surface of Lap, and strong interactions between PEO and CTAB exist. The stability of ternary systems Lap + PEO + CTAB can be finely regulated by changing the balance of these interactions. The electrokinetic technique was used to study 0.065 and 2% wt Lap suspensions in the presence of different amounts of PEO of various molecular masses Mw (400-20,000 g/mol) and CTAB (0-1 mM). For 0.065% wt Lap suspension, the additives of PEO did not affect the position of the isoelectric point (IEP), but the impact of PEO in the regions below or above the IEP was significant, especially for a large Mw. The observed effects were explained, accounting the model for the adsorption of PEO in the form of loops and tails as well as for the changes in the packing balance of CTAB and PEO on the surface of Lap. For 2% wt suspension, the strong effects of Mw on the ζ-potential and aggregation of particles were explained by screening the repulsive double layers by PEO chains, by bridging the Lap particles via PEO molecules, and by the impact of CTAB molecules on the bridging between Lap aggregates.
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Affiliation(s)
- Maryna V Manilo
- Research Institute of Applied Earth Sciences and MTA-ME Materials Science Research Group, University of Miskolc 3515, Miskolc, Hungary.,F.D. Ovcharenko Institute of Biocolloidal Chemistry, NAS of Ukraine, 42, Vernadsky Avenue, Kyiv 03142, Ukraine
| | - Nikolai I Lebovka
- F.D. Ovcharenko Institute of Biocolloidal Chemistry, NAS of Ukraine, 42, Vernadsky Avenue, Kyiv 03142, Ukraine
| | - Sandor Barany
- Research Institute of Applied Earth Sciences and MTA-ME Materials Science Research Group, University of Miskolc 3515, Miskolc, Hungary
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20
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Qi H, Ma B, Tan H, Li C, Zhi Z, Wang H, Liu X, Yang Q. Effect of sodium gluconate on molecular conformation of polycarboxylate superplasticizer studied by the molecular dynamics simulation. J Mol Model 2020; 26:45. [PMID: 32009188 DOI: 10.1007/s00894-020-4309-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Accepted: 01/23/2020] [Indexed: 11/26/2022]
Abstract
Sodium gluconate (SG) has been accepted as one of the main additional components in polycarboxylate superplasticizer (PCE) system, due to its excellent retarding effect. While the negative effect on dispersion of PCE was reported in the literature, the reason was not completely revealed. In this study, molecular dynamics simulation was used to investigate the mutual influence between SG and PCE in calcium hydroxide (CH) solution. Radial distribution function (RDF) was used to analyze the effects of SG on the complexation of PCE with Ca2+. Radius of gyration (Rg) was adopted to characterize the conformations of the backbone and side chains of PCE in CH solution. Finally, several adsorption and dispersion models were proposed. The results showed that the presence of SG would perturb adsorption of PCE, which was one of the main reasons that affected the dispersion ability of PCE. SG could preferentially combine with Ca2+ so that less amount of Ca2+ is available for combination of PCE, and this could extend the main chain of PCE and show advantage for PCE adsorption. Besides, adding SG could squeeze the side chains of PCE, which would put a negative effect on the dispersion. These findings gave deeper insight into understanding the dispersion mechanism of PCE-SG system.
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Affiliation(s)
- Huahui Qi
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, Hubei, China
| | - Baoguo Ma
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, Hubei, China
| | - Hongbo Tan
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, Hubei, China.
| | - Chunbao Li
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, Hubei, China
| | - Zhenzhen Zhi
- School of materials science and engineering, Luoyang Institute of Science and Technology, Luoyang, 471023, Henan, China
| | - Hui Wang
- Faculty of Architectural, Civil Engineering and Environment, Ningbo University, Ningbo, 315000, China
| | - Xiaohai Liu
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, Hubei, China
| | - Qi Yang
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, Hubei, China
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21
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Kataria S, Verma YL, Gupta H, Singh SK, Srivastava N, Dhar R, Singh RK. Ionic liquid mediated nano-composite polymer gel electrolyte for rechargeable battery application. POLYM-PLAST TECH MAT 2020. [DOI: 10.1080/25740881.2019.1708102] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Shalu Kataria
- Centre of Material Sciences, IIDS, University of Allahabad, Allahabad, India
| | - Yogendra L. Verma
- Centre of Material Sciences, IIDS, University of Allahabad, Allahabad, India
| | - Himani Gupta
- Department of Physics, Ionic Liquid and Solid State Ionics Laboratory, Institute of Science, Banaras Hindu University, Varansi, India
| | - Shishir K. Singh
- Department of Physics, Ionic Liquid and Solid State Ionics Laboratory, Institute of Science, Banaras Hindu University, Varansi, India
| | - Nitin Srivastava
- Department of Physics, Ionic Liquid and Solid State Ionics Laboratory, Institute of Science, Banaras Hindu University, Varansi, India
| | - Ravindra Dhar
- Centre of Material Sciences, IIDS, University of Allahabad, Allahabad, India
| | - Rajendra Kumar Singh
- Department of Physics, Ionic Liquid and Solid State Ionics Laboratory, Institute of Science, Banaras Hindu University, Varansi, India
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22
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Selli D, Motta S, Di Valentin C. Impact of surface curvature, grafting density and solvent type on the PEGylation of titanium dioxide nanoparticles. J Colloid Interface Sci 2019; 555:519-531. [DOI: 10.1016/j.jcis.2019.07.106] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Revised: 07/16/2019] [Accepted: 07/31/2019] [Indexed: 01/24/2023]
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23
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Ensing B, Tiwari A, Tros M, Hunger J, Domingos SR, Pérez C, Smits G, Bonn M, Bonn D, Woutersen S. On the origin of the extremely different solubilities of polyethers in water. Nat Commun 2019; 10:2893. [PMID: 31253797 PMCID: PMC6599002 DOI: 10.1038/s41467-019-10783-z] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Accepted: 05/21/2019] [Indexed: 11/09/2022] Open
Abstract
The solubilities of polyethers are surprisingly counter-intuitive. The best-known example is the difference between polyethylene glycol ([-CH2-CH2-O-]n) which is infinitely soluble, and polyoxymethylene ([-CH2-O-]n) which is completely insoluble in water, exactly the opposite of what one expects from the C/O ratios of these molecules. Similar anomalies exist for oligomeric and cyclic polyethers. To solve this apparent mystery, we use femtosecond vibrational and GHz dielectric spectroscopy with complementary ab initio calculations and molecular dynamics simulations. We find that the dynamics of water molecules solvating polyethers is fundamentally different depending on their C/O composition. The ab initio calculations and simulations show that this is not because of steric effects (as is commonly believed), but because the partial charge on the O atoms depends on the number of C atoms by which they are separated. Our results thus show that inductive effects can have a major impact on aqueous solubilities.
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Affiliation(s)
- Bernd Ensing
- Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098XH, Amsterdam, The Netherlands.
| | - Ambuj Tiwari
- Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098XH, Amsterdam, The Netherlands
| | - Martijn Tros
- Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098XH, Amsterdam, The Netherlands
| | - Johannes Hunger
- Max Planck Institute for Polymer Research, Department of Molecular spectroscopy, Ackermannweg 10, 55128, Mainz, Germany.
| | - Sérgio R Domingos
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607, Hamburg, Germany
| | - Cristóbal Pérez
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607, Hamburg, Germany
| | - Gertien Smits
- Swammerdam Institute for Life Sciences, University of Amsterdam, Science Park 904, 1098XH, Amsterdam, The Netherlands
| | - Mischa Bonn
- Max Planck Institute for Polymer Research, Department of Molecular spectroscopy, Ackermannweg 10, 55128, Mainz, Germany.
| | - Daniel Bonn
- Institute of Physics, University of Amsterdam, Science Park 904, 1098XH, Amsterdam, The Netherlands
| | - Sander Woutersen
- Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098XH, Amsterdam, The Netherlands.
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Dahal UR, Prhashanna A, Dormidontova EE. Hydration of diblock copolymer micelles: Effects of hydrophobicity and co-solvent. J Chem Phys 2019; 150:184908. [PMID: 31091932 DOI: 10.1063/1.5089251] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Diblock polymer micelles dispersed in an aqueous environment are being actively investigated for various applications, but there is only a qualitative understanding of the effect of the chemical structure on the micelle hydration and water dynamics as these properties are difficult to assess experimentally. Using all-atom molecular dynamics simulations, we investigate aqueous solutions of three comparable in size diblock copolymer micelles with core-forming blocks of different hydrophobicity: polybutadiene (PB), polycaprolactone (PCL), and polytetrahydrofuran (pTHF) with the same hydrophilic block, polyethylene oxide (PEO). We found that core-block hydrophobicity and ability to form hydrogen bonds with water strongly affect the water dynamics near the core: water molecules spend considerably less time in contact with the PB block than with PCL and pTHF blocks. We obtained polymer and solvent volume fraction profiles and determined that the interfacial width systematically increases with a decrease of core block hydrophobicity with water penetration into the core being negligible for PB-PEO and PCL-PEO micelles, while for pTHF-PEO micelles the interface is more diffuse and there is a noticeable penetration of water (17% by volume). For PCL-PEO micelles, which are commonly used in biomedical applications, we also investigated tetrahydrofuran (THF) penetration into the micelles from mixed THF:water solution at early stages of micelle dissolution. We found an inhomogeneous solvent distribution with a maximum of THF volume fraction in the interfacial core-corona region and partial exclusion from the PEO corona, which slows down micelle dissolution. These results can have important implications for micelle stability and use in biomedical applications.
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Affiliation(s)
- Udaya R Dahal
- Polymer Program, Institute of Materials Science and Physics Department, University of Connecticut, Storrs, Connecticut 06269, USA
| | - Ammu Prhashanna
- Polymer Program, Institute of Materials Science and Physics Department, University of Connecticut, Storrs, Connecticut 06269, USA
| | - Elena E Dormidontova
- Polymer Program, Institute of Materials Science and Physics Department, University of Connecticut, Storrs, Connecticut 06269, USA
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25
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Dahal U, Wang Z, Dormidontova EE. Hydration of Spherical PEO-Grafted Gold Nanoparticles: Curvature and Grafting Density Effect. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b01114] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Udaya Dahal
- Polymer Program, Institute of Materials Science and Physics Department, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Zilu Wang
- Polymer Program, Institute of Materials Science and Physics Department, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Elena E. Dormidontova
- Polymer Program, Institute of Materials Science and Physics Department, University of Connecticut, Storrs, Connecticut 06269, United States
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26
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Donets S, Sommer JU. Molecular Dynamics Simulations of Strain-Induced Phase Transition of Poly(ethylene oxide) in Water. J Phys Chem B 2018; 122:392-397. [PMID: 29260568 DOI: 10.1021/acs.jpcb.7b10793] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
We study the dilute aqueous solutions of poly(ethylene oxide) (PEO) oligomers that are subject to an elongating force dipole acting on both chain ends using atomistic molecular dynamics. By increasing the force, liquid-liquid demixing can be observed at room temperature far below the lower critical solution temperature. For forces above 35 pN, fibrillar nanostructures are spontaneously formed related to a decrease in hydrogen bonding between PEO and water. Most notable is a rapid decrease in the bifurcated hydrogen bonds during stretching, which can also be observed for isolated single chains. The phase-segregated structures display signs of chain ordering, but a clear signature of the crystalline order is not obtained during the simulation time, indicating a liquid-liquid phase transition induced by chain stretching. Our results indicate that the solvent quality of the aqueous solution of PEO depends on the conformational state of the chains, which is most likely related to the specific hydrogen-bond-induced solvation of PEO in water. The strain-induced demixing of PEO opens the possibility to obtain polymer fibers with low energy costs because crystallization starts via the strain-induced demixing in the extended state only.
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Affiliation(s)
- Sergii Donets
- Institute Theory of Polymers, Leibniz-Institute of Polymer Research , 01069 Dresden, Germany
| | - Jens-Uwe Sommer
- Institute Theory of Polymers, Leibniz-Institute of Polymer Research , 01069 Dresden, Germany.,Institute for Theoretical Physics, Technische Universität Dresden , 01069 Dresden, Germany
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27
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Schoch RL, Emilsson G, Dahlin AB, Lim RY. Protein exclusion is preserved by temperature sensitive PEG brushes. POLYMER 2017. [DOI: 10.1016/j.polymer.2017.10.063] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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28
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Affiliation(s)
- Udaya R. Dahal
- Polymer Program,
Institute of Materials Science and Physics Department, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Zilu Wang
- Polymer Program,
Institute of Materials Science and Physics Department, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Elena E. Dormidontova
- Polymer Program,
Institute of Materials Science and Physics Department, University of Connecticut, Storrs, Connecticut 06269, United States
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