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Yu M, Jiang C, Lai B, Zhang K. Exploring Novel Sensor Design Ideas through Concentration-Induced Conformational Changes in PEG Single Chains. SENSORS (BASEL, SWITZERLAND) 2024; 24:883. [PMID: 38339600 PMCID: PMC10856974 DOI: 10.3390/s24030883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Revised: 01/16/2024] [Accepted: 01/24/2024] [Indexed: 02/12/2024]
Abstract
Polyethylene glycol (PEG) is an artificial polymer with good biocompatibility and a low cost, which has a wide range of applications. In this study, the dynamic response of PEG single chains to different ion concentrations was investigated from a microscopic point of view based on single-molecule force spectroscopy, revealing unique interactions that go beyond the traditional sensor-design paradigm. Under low concentrations of potassium chloride, PEG single chains exhibit a gradual reduction in rigidity, while, conversely, high concentrations induce a progressive increase in rigidity. This dichotomy serves as the cornerstone for a profound understanding of PEG conformational dynamics under diverse ion environments. Capitalizing on the remarkable sensitivity of PEG single chains to ion concentration shifts, we introduce innovative sensor-design ideas. Rooted in the adaptive nature of PEG single chains, these sensor designs extend beyond the traditional applications, promising advancements in environmental monitoring, healthcare, and materials science.
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Affiliation(s)
- Miao Yu
- School of Mechanical Engineering, Sichuan University, Chengdu 610065, China; (M.Y.); (C.J.); (B.L.)
- Yibin Industrial Technology Research Institute, Sichuan University, Yibin 644000, China
| | - Chong Jiang
- School of Mechanical Engineering, Sichuan University, Chengdu 610065, China; (M.Y.); (C.J.); (B.L.)
- Yibin Industrial Technology Research Institute, Sichuan University, Yibin 644000, China
| | - Bing Lai
- School of Mechanical Engineering, Sichuan University, Chengdu 610065, China; (M.Y.); (C.J.); (B.L.)
- Yibin Industrial Technology Research Institute, Sichuan University, Yibin 644000, China
| | - Kai Zhang
- School of Mechanical Engineering, Sichuan University, Chengdu 610065, China; (M.Y.); (C.J.); (B.L.)
- Yibin Industrial Technology Research Institute, Sichuan University, Yibin 644000, China
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2
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Macias E, Travesset A. Hydrogen Bond Network Disruption by Hydration Layers in Water Solutions with Salt and Hydrogen-Bonding Polymers (PEO). J Phys Chem B 2023. [PMID: 37478338 DOI: 10.1021/acs.jpcb.3c02505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/23/2023]
Abstract
A mean field theory model describing the interaction of ion hydration layers with the network of hydrogen bonds of both water and the nonionic polymer poly(ethylene oxide) (PEO) is presented. The predictions of the model for types and statistics of hydrogen bonds, the number of water molecules bound to PEO, or their dependence on temperature are successfully verified from all-atom simulations at different NaCl and PEO concentrations. Furthermore, our simulations show that the binding of cations to PEO increases monotonically with salt concentration, in agreement with recent experimental results, through a mechanism in which the sum of the number of bound water and cations is independent of salt concentration. The model introduced is general and can describe any salt or hydrogen-bond-forming polymer.
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Affiliation(s)
- Elizabeth Macias
- Department of Physics and Astronomy, Iowa State University and Ames Lab, Ames, Iowa 50011, United States
| | - Alex Travesset
- Department of Physics and Astronomy, Iowa State University and Ames Lab, Ames, Iowa 50011, United States
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3
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Marcuccio F, Soulias D, Chau CCC, Radford SE, Hewitt E, Actis P, Edwards MA. Mechanistic Study of the Conductance and Enhanced Single-Molecule Detection in a Polymer-Electrolyte Nanopore. ACS NANOSCIENCE AU 2023; 3:172-181. [PMID: 37096230 PMCID: PMC10119975 DOI: 10.1021/acsnanoscienceau.2c00050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Revised: 12/13/2022] [Accepted: 12/14/2022] [Indexed: 04/26/2023]
Abstract
Solid-state nanopores have been widely employed in the detection of biomolecules, but low signal-to-noise ratios still represent a major obstacle in the discrimination of nucleic acid and protein sequences substantially smaller than the nanopore diameter. The addition of 50% poly(ethylene) glycol (PEG) to the external solution is a simple way to enhance the detection of such biomolecules. Here, we demonstrate with finite-element modeling and experiments that the addition of PEG to the external solution introduces a strong imbalance in the transport properties of cations and anions, drastically affecting the current response of the nanopore. We further show that the strong asymmetric current response is due to a polarity-dependent ion distribution and transport at the nanopipette tip region, leading to either ion depletion or enrichment for few tens of nanometers across its aperture. We provide evidence that a combination of the decreased/increased diffusion coefficients of cations/anions in the bath outside the nanopore and the interaction between a translocating molecule and the nanopore-bath interface is responsible for the increase in the translocation signals. We expect this new mechanism to contribute to further developments in nanopore sensing by suggesting that tuning the diffusion coefficients of ions could enhance the sensitivity of the system.
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Affiliation(s)
- Fabio Marcuccio
- School
of Electronic and Electrical Engineering, University of Leeds, LeedsLS2 9JT, U.K.
- Bragg
Centre for Materials Research, University
of Leeds, LeedsLS2 9JT, U.K.
| | - Dimitrios Soulias
- School
of Electronic and Electrical Engineering, University of Leeds, LeedsLS2 9JT, U.K.
- Bragg
Centre for Materials Research, University
of Leeds, LeedsLS2 9JT, U.K.
| | - Chalmers C. C. Chau
- School
of Electronic and Electrical Engineering, University of Leeds, LeedsLS2 9JT, U.K.
- Bragg
Centre for Materials Research, University
of Leeds, LeedsLS2 9JT, U.K.
- School
of Molecular and Cellular Biology and Astbury Centre for Structural
Molecular Biology, University of Leeds, LeedsLS2 9JT, U.K.
| | - Sheena E. Radford
- School
of Molecular and Cellular Biology and Astbury Centre for Structural
Molecular Biology, University of Leeds, LeedsLS2 9JT, U.K.
| | - Eric Hewitt
- School
of Molecular and Cellular Biology and Astbury Centre for Structural
Molecular Biology, University of Leeds, LeedsLS2 9JT, U.K.
| | - Paolo Actis
- School
of Electronic and Electrical Engineering, University of Leeds, LeedsLS2 9JT, U.K.
- Bragg
Centre for Materials Research, University
of Leeds, LeedsLS2 9JT, U.K.
| | - Martin Andrew Edwards
- Department
of Chemistry and Biochemistry, University
of Arkansas, Fayetteville, Arkansas72701, United States
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4
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Bao J, Mao H, Li X, Zhou J, Dong X, Chen S, Zhang X, Chen W. Salt‐Induced Changes in Sol‐to‐Gel Transition and Structure of Stereocomplexable Poly(lactic acid)/Poly(ethylene glycol) Copolymers. MACROMOL CHEM PHYS 2021. [DOI: 10.1002/macp.202000354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Jianna Bao
- School of Materials Science and Engineering Zhejiang Sci‐Tech University Hangzhou 310018 China
| | - Hailiang Mao
- Zhejiang Hengyi Group Co. Ltd. Hangzhou 311215 China
| | - Xiang Li
- School of Materials Science and Engineering Zhejiang Sci‐Tech University Hangzhou 310018 China
| | - Jiale Zhou
- School of Materials Science and Engineering Zhejiang Sci‐Tech University Hangzhou 310018 China
| | - Xiaolei Dong
- School of Materials Science and Engineering Zhejiang Sci‐Tech University Hangzhou 310018 China
| | - Shichang Chen
- School of Materials Science and Engineering Zhejiang Sci‐Tech University Hangzhou 310018 China
| | - Xianming Zhang
- School of Materials Science and Engineering Zhejiang Sci‐Tech University Hangzhou 310018 China
| | - Wenxing Chen
- School of Materials Science and Engineering Zhejiang Sci‐Tech University Hangzhou 310018 China
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5
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Lu JE, Chen S. Organized assembling of poly(ethylene glycol)-functionalized Janus nanoparticles induced by select alkali metal ions. INORG CHEM COMMUN 2019. [DOI: 10.1016/j.inoche.2019.107586] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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6
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Chen S. Conformation and solubility of poly(ethylene oxide) in polymer-surfactant complex at high-temperature and high-salinity conditions. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.123811] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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7
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8
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Lehmkühler F, Schulz F, Schroer MA, Frenzel L, Lange H, Grübel G. Local orientational order in self-assembled nanoparticle films: the role of ligand composition and salt. J Appl Crystallogr 2019. [DOI: 10.1107/s1600576719007568] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
An X-ray cross-correlation study of the local orientational order in self-assembled films made from PEGylated gold nanoparticles is presented. The local structure of this model system is dominated by four- and sixfold order. Coadsorption of shorter ligands in the particle's ligand layer and variation of salt concentration in the suspension prior to self-assembly result in a change of local orientational order. The degree of sixfold order is reduced after salt addition. This decrease of order is less pronounced for the fourfold symmetry. The results presented here suggest complex symmetry-selective order formation upon ligand exchange and salt addition and demonstrate the versatility of X-ray cross-correlation methods for nanoparticle superlattices.
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9
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Zhao XJ, Gao ZF. A Theoretical Investigation on the pH Responses of Strong Polyelectrolyte Brushes. POLYMER SCIENCE SERIES A 2019. [DOI: 10.1134/s0965545x19030209] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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10
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Kolewe KW, Kalasin S, Shave M, Schiffman JD, Santore MM. Mechanical Properties and Concentrations of Poly(ethylene glycol) in Hydrogels and Brushes Direct the Surface Transport of Staphylococcus aureus. ACS APPLIED MATERIALS & INTERFACES 2019; 11:320-330. [PMID: 30595023 PMCID: PMC6771038 DOI: 10.1021/acsami.8b18302] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Surface-associated transport of flowing bacteria, including cell rolling, is a mechanism for otherwise immobile bacteria to migrate on surfaces and could be associated with biofilm formation or the spread of infection. This work demonstrates how the moduli and/or local polymer concentration play critical roles in sustaining contact, dynamic adhesion, and transport of bacterial cells along a hydrogel or hydrated brush surface. In particular, stiffer more concentrated hydrogels and brushes maintained the greatest dynamic contact, still allowing cells to travel along the surface in flow. This study addressed how the mechanical properties, molecular architectures, and thicknesses of minimally adhesive poly(ethylene glycol) (PEG)-based coatings influence the flow-driven surface motion of Staphylococcus aureus MS2 cells. Three protein-repellant PEG-dimethylacrylate hydrogel films (∼100 μm thick) and two protein-repellant PEG brushes (8-16 nm thick) were sufficiently fouling-resistant to prevent the accumulation of flowing bacteria. However, the rolling or hopping-like motions of gently flowing S. aureus cells along the surfaces were specific to the particular hydrogel or brush, distinguishing these coatings in terms of their mechanical properties (with moduli from 2 to 1300 kPa) or local PEG concentrations (in the range 10-50% PEG). On the stiffer hydrogel coatings having higher PEG concentrations, S. aureus exhibited long runs of surface rolling, 20-50 μm in length, an increased tendency of cells to repeatedly return to some surfaces after rolling and escaping, and relatively long integrated contact times. By contrast, on the softer more dilute hydrogels, bacteria tended to encounter the surface for brief periods before escaping without return. The dynamic adhesion and motion signatures of the cells on the two brushes were bracketed by those on the soft and stiff hydrogels, demonstrating that PEG coating thickness was not important in these studies where the vertically oriented surfaces minimized the impact of gravitational forces. Control studies with similarly sized poly(ethylene oxide)-coated rigid spherical microparticles, that also did not arrest on the PEG coatings, established that the bacterial skipping and rolling signatures were specific to the S. aureus cells and not simply diffusive. Dynamic adhesion of the S. aureus cells on the PEG hydrogel surfaces correlated well with quiescent 24 h adhesion studies in the literature, despite the orientation of the flow studies that eliminated the influence of gravity on bacteria-coating normal forces.
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Affiliation(s)
- Kristopher W. Kolewe
- Department of Chemical Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003-9303, United States
| | - Surachate Kalasin
- Department of Polymer Science and Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003-9303, United States
| | - Molly Shave
- Department of Polymer Science and Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003-9303, United States
| | - Jessica D. Schiffman
- Department of Chemical Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003-9303, United States
- Corresponding Authors: . Phone: (413) 545-6143 (J.D.S.)., . Phone: (413) 577-1417 (M.M.S.)
| | - Maria M. Santore
- Department of Polymer Science and Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003-9303, United States
- Corresponding Authors: . Phone: (413) 545-6143 (J.D.S.)., . Phone: (413) 577-1417 (M.M.S.)
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11
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Schroer MA, Lehmkühler F, Möller J, Lange H, Grübel G, Schulz F. Pressure-Stimulated Supercrystal Formation in Nanoparticle Suspensions. J Phys Chem Lett 2018; 9:4720-4724. [PMID: 30070842 DOI: 10.1021/acs.jpclett.8b02145] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Nanoparticles can self-organize into "supercrystals" with many potential applications. Different paths can lead to nanoparticle self-organization into such periodic arrangements. An essential step is the transition from an amorphous state to the crystalline one. We investigate how pressure can induce a phase transition of a nanoparticle model system in water from the disordered liquid state to highly ordered supercrystals. We observe reversible pressure-induced supercrystal formation in concentrated solutions of gold nanoparticles by means of small-angle X-ray scattering. The supercrystal formation occurs only at high salt concentrations in the aqueous solution. The pressure dependence of the structural parameters of the resulting crystal lattices is determined. The observed transition can be reasoned with the combined effect of salt and pressure on the solubility of the organic PEG shell that passivates the nanoparticles.
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Affiliation(s)
- Martin A Schroer
- European Molecular Biology Laboratory (EMBL) , Hamburg Outstation c/o DESY , 22607 Hamburg , Germany
| | - Felix Lehmkühler
- Deutsches Elektronen-Synchrotron (DESY) , 22607 Hamburg , Germany
- The Hamburg Centre for Ultrafast Imaging (CUI) , 22761 Hamburg , Germany
| | - Johannes Möller
- European X-Ray Free-Electron Laser Facility (XFEL) , 22869 Schenefeld , Germany
| | - Holger Lange
- The Hamburg Centre for Ultrafast Imaging (CUI) , 22761 Hamburg , Germany
- University of Hamburg, Institute of Physical Chemistry , 20146 Hamburg , Germany
| | - Gerhard Grübel
- Deutsches Elektronen-Synchrotron (DESY) , 22607 Hamburg , Germany
- The Hamburg Centre for Ultrafast Imaging (CUI) , 22761 Hamburg , Germany
| | - Florian Schulz
- The Hamburg Centre for Ultrafast Imaging (CUI) , 22761 Hamburg , Germany
- University of Hamburg, Institute of Physical Chemistry , 20146 Hamburg , Germany
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12
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Sousa SF, Peres J, Coelho M, Vieira TF. Analyzing PEGylation through Molecular Dynamics Simulations. ChemistrySelect 2018. [DOI: 10.1002/slct.201800855] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Sérgio F. Sousa
- UCIBIO@REQUIMTE; BioSIM; Departamento de Biomedicina; Faculdade de Medicina da Universidade do Porto, Alameda Professor Hernâni Monteiro; 4200-319, Porto Portugal
| | - Joana Peres
- LEPABE; Faculdade de Engenharia; Universidade do Porto, Porto; Portugal
| | - Manuel Coelho
- LEPABE; Faculdade de Engenharia; Universidade do Porto, Porto; Portugal
| | - Tatiana F. Vieira
- LEPABE; Faculdade de Engenharia; Universidade do Porto, Porto; Portugal
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13
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Micellar interaction of binary mixtures of alpha olefin sulfonate and nonylphenol polyethylene glycol ethers: Length effects of ethylene oxide. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2018.01.036] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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14
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Oba Y, Okuhata M, Osakai T, Mochida T. Solvate and protic ionic liquids from aza-crown ethers: synthesis, thermal properties, and LCST behavior. Phys Chem Chem Phys 2018; 20:3118-3127. [PMID: 28849817 DOI: 10.1039/c7cp02807e] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In recent years, solvate and protic ionic liquids (ILs) have attracted much attention. We synthesized both types of ILs from alkyl aza-crown ethers (L = N-propyl-1-aza-15-crown-5 (L1) and N-C6F13C2H4-1-aza-15-crown-5 (L2)). The solvate ILs [ML][Tf2N] (M = Na+, K+) were solids (Tm = 58-68 °C), whereas the solvate ILs [ML][Tf2N] (M = Li+, Ag+) and protic ILs [HL][Tf2N] were liquids with low glass transition temperatures. The ILs containing Na ions were more crystalline and exhibited higher melting points than the other ILs. The decomposition temperatures of the protic ILs were higher than those of the solvate ILs. A protic IL with a paramagnetic anion, [HL1][FeCl4] (Tm = 70.5 °C), was also synthesized and its crystal structure was determined. The solvate ILs [NaL2][X] (X = Cl-, CF3CO2-, TsO-, PhSO3-) exhibited a lower critical solution temperature (LCST)-type behavior in water. The effects of salt addition on the LCST of L2 were also investigated. The LCST of these ILs generally increased with increasing hydrophilicity or basicity of the counter anion. This tendency, which is nearly opposite to that of ILs with quaternary onium cations, is ascribed to the amphiphilic nature of the cation. The corresponding protic ILs did not exhibit LCST behavior.
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Affiliation(s)
- Yukiko Oba
- Department of Chemistry, Graduate School of Science, Kobe University, Rokkodai, Nada, Hyogo 657-8501, Japan.
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15
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Giesecke M, Hallberg F, Fang Y, Stilbs P, Furó I. Binding of Monovalent and Multivalent Metal Cations to Polyethylene Oxide in Methanol Probed by Electrophoretic and Diffusion NMR. J Phys Chem B 2016; 120:10358-10366. [PMID: 27622602 DOI: 10.1021/acs.jpcb.6b08923] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Complex formation in methanol between monodisperse polyethylene oxide (PEO) and a large set of cations was studied by measuring the effective charge acquired by PEO upon complexation. Quantitative data were obtained at a low ionic strength of 2 mM (for some salts, also between 0.5 and 6 mM) by a combination of diffusion nuclear magnetic resonance (NMR) and electrophoretic NMR experiments. For strongly complexing cations, the magnitude of the acquired effective charge was on the order of 1 cation per 100 monomer units. For monovalent cations, the relative strength of binding varies as Na+ < K+ ≈ Rb+ ≈ Cs+, whereas Li+ exhibited no significant binding. All polyvalent cations bind very weakly, except for Ba2+ that exhibited strong binding. Anions do not bind, as is shown by the lack of response to the chemical nature of anionic species (perchlorate, iodide, or acetate). Diffusion experiments directly show that the acetate anion with monovalent cations does not associate with PEO. Considering all cations, we find that the observed binding does not follow any Hofmeister order. Instead, binding occurs below a critical surface charge density, which indicates that the degree of complexation is defined by the solvation shell. A large solvation shell prevents the binding of most multivalent ions.
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Affiliation(s)
- Marianne Giesecke
- Division of Applied Physical Chemistry, Department of Chemistry, KTH Royal Institute of Technology , SE-10044 Stockholm, Sweden
| | - Fredrik Hallberg
- Division of Applied Physical Chemistry, Department of Chemistry, KTH Royal Institute of Technology , SE-10044 Stockholm, Sweden
| | - Yuan Fang
- Division of Applied Physical Chemistry, Department of Chemistry, KTH Royal Institute of Technology , SE-10044 Stockholm, Sweden
| | - Peter Stilbs
- Division of Applied Physical Chemistry, Department of Chemistry, KTH Royal Institute of Technology , SE-10044 Stockholm, Sweden
| | - István Furó
- Division of Applied Physical Chemistry, Department of Chemistry, KTH Royal Institute of Technology , SE-10044 Stockholm, Sweden
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16
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Foam stabilisation using surfactant exfoliated graphene. J Colloid Interface Sci 2016; 469:196-204. [DOI: 10.1016/j.jcis.2016.02.015] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2016] [Revised: 02/02/2016] [Accepted: 02/04/2016] [Indexed: 11/21/2022]
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17
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Ghoshal T, Ntaras C, O'Connell J, Shaw MT, Holmes JD, Avgeropoulos A, Morris MA. Fabrication of ultra-dense sub-10 nm in-plane Si nanowire arrays by using a novel block copolymer method: optical properties. NANOSCALE 2016; 8:2177-2187. [PMID: 26731306 DOI: 10.1039/c5nr07085f] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The use of a low-χ, symmetric block copolymer as an alternative to the high-χ systems currently being translated towards industrial silicon chip manufacture has been demonstrated. Here, the methodology for generating on-chip, etch resistant masks and subsequent pattern transfer to the substrate using ultra-small dimension, lamellar, microphase separated polystyrene-b-poly(ethylene oxide) (PS-b-PEO) block copolymer (BCP) is described. Well-controlled films of a perpendicularly oriented lamellar pattern with a domain size of ∼8 nm were achieved through amplification of an effective interaction parameter (χeff) of the BCP system. The self-assembled films were used as 'templates' for the generation of inorganic oxides nanowire arrays through selective metal ion inclusion and subsequent processing. Inclusion is a significant challenge because the lamellar systems have less chemical and mechanical robustness than the cylinder forming materials. The oxide nanowires of uniform diameter (∼8 nm) were isolated and their structure mimics the original BCP nanopatterns. We demonstrate that these lamellar phase iron oxide nanowire arrays could be used as a resist mask to fabricate densely packed, identical ordered, good fidelity silicon nanowire arrays on the substrate. Possible applications of the materials prepared are discussed, in particular, in the area of photonics and photoluminescence where the properties are found to be similar to those of surface-oxidized silicon nanocrystals and porous silicon.
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Affiliation(s)
- Tandra Ghoshal
- Materials research group, Department of Chemistry and Tyndall National Institute, University College Cork, Cork, Ireland. and AMBER (Advanced Materials and Biological Engineering Research Centre), Trinity College Dublin, Dublin, Ireland
| | - Christos Ntaras
- Department of Materials Science Engineering, University of Ioannina, Ioannina, Greece
| | - John O'Connell
- Materials research group, Department of Chemistry and Tyndall National Institute, University College Cork, Cork, Ireland.
| | - Matthew T Shaw
- Intel Ireland Ltd, Collinstown Industrial Estate, Co., Kildare, Ireland
| | - Justin D Holmes
- Materials research group, Department of Chemistry and Tyndall National Institute, University College Cork, Cork, Ireland. and AMBER (Advanced Materials and Biological Engineering Research Centre), Trinity College Dublin, Dublin, Ireland
| | | | - Michael A Morris
- Materials research group, Department of Chemistry and Tyndall National Institute, University College Cork, Cork, Ireland. and AMBER (Advanced Materials and Biological Engineering Research Centre), Trinity College Dublin, Dublin, Ireland
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18
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19
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Ren CL, Nakamura I, Wang ZG. Effects of Ion-Induced Cross-Linking on the Phase Behavior in Salt-Doped Polymer Blends. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b02229] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Chun-Lai Ren
- National
Laboratory of Solid State Microstructures and Department of Physics,
Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Issei Nakamura
- State
Key Laboratory of Polymer Physics and Chemistry, Changchun Institute
of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
| | - Zhen-Gang Wang
- Division
of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
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20
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Goldansaz H, Auhl D, Goderis B, Voleppe Q, Fustin CA, Gohy JF, Bailly C, van Ruymbeke E. Transient Metallosupramolecular Networks Built from Entangled Melts of Poly(ethylene oxide). Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b00703] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
| | - Dietmar Auhl
- Faculty
of Humanities and Sciences, Maastricht University, Maastricht, Netherlands
| | - Bart Goderis
- Polymer
Chemistry and Materials, Katholieke Universiteit Leuven, Celestijnenlaan
200f, 3001 Heverlee, Belgium
| | | | - Charles-André Fustin
- Bio and Soft Matter Division (BSMA), Institut de la Matière
Condensée et des Nanosciences (IMCN), Université catholique de Louvain, Place Pasteur 1, 1348 Louvain-la-Neuve, Belgium
| | - Jean-François Gohy
- Bio and Soft Matter Division (BSMA), Institut de la Matière
Condensée et des Nanosciences (IMCN), Université catholique de Louvain, Place Pasteur 1, 1348 Louvain-la-Neuve, Belgium
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21
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Šindelka K, Limpouchová Z, Lísal M, Procházka K. Dissipative Particle Dynamics Study of Electrostatic Self-Assembly in Aqueous Mixtures of Copolymers Containing One Neutral Water-Soluble Block and One Either Positively or Negatively Charged Polyelectrolyte Block. Macromolecules 2014. [DOI: 10.1021/ma501018x] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Karel Šindelka
- Department
of Physical and Macromolecular Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030, 128
40 Prague 2, Czech Republic
| | - Zuzana Limpouchová
- Department
of Physical and Macromolecular Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030, 128
40 Prague 2, Czech Republic
| | - Martin Lísal
- Laboratory
of Chemistry and Physics of Aerosols, Institute of Chemical Process Fundamentals of the ASCR, v. v. i., Rozvojová 135/1, 165 02 Prague 6-Suchdol, Czech Republic
- Department
of Physics, Faculty of Science, J. E. Purkinje University, České
Mládeže 8, 400 96 Ústí nad Labem, Czech Republic
| | - Karel Procházka
- Department
of Physical and Macromolecular Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030, 128
40 Prague 2, Czech Republic
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22
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Feng C, Ren CL, Ma YQ. The coexisting phase behavior of thermo-responsive copolymer solutions. SOFT MATTER 2014; 10:5523-5531. [PMID: 24954236 DOI: 10.1039/c4sm00607k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Using a molecular theory for dilute PEO-b-PNIPAm solutions, we first take the formation of hydrogen bonds between copolymer monomers and water molecules into account, which enables us to study the impact of temperature on PEO-b-PNIPAm self-assembly effectively by quantitatively describing the different changes in water affinities of two blocks. With the increase of temperature, hydrogen bonds between PNIPAm and water break down dramatically, resulting in the hydrophobic character of PNIPAm while PEO remains hydrophilic. Amphiphilic copolymers in the aqueous surrounding can aggregate into various structures: micelles and vesicles. According to the equilibrium criterion of the excess grand potential under the conditions of the grand canonical ensemble, we find that both structures are stable and can coexist. Theoretically calculated potentials of mean force of aggregates further verify the coexistence of micelles and vesicles, although the low critical solution temperatures of different aggregates are different under these conditions. A phase diagram as functions of temperature and the weight fraction of PEO (fPEO) is obtained, which shows different regions of micelles, vesicles and their coexistence. It implies the appearance of two types of micelle-vesicle transition: spontaneous and temperature-induced. Since PEO-b-PNIPAm as a thermoresponsive material has a broad range of applications, a systematic investigation of the phase behavior is very useful not only for the scientific interest but also for the practical applications.
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Affiliation(s)
- Chao Feng
- National Laboratory of Solid State Microstructures, Department of Physics, Nanjing University, Nanjing 210093, China.
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23
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Nap RJ, Tagliazucchi M, Szleifer I. Born energy, acid-base equilibrium, structure and interactions of end-grafted weak polyelectrolyte layers. J Chem Phys 2014; 140:024910. [DOI: 10.1063/1.4861048] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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24
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Tian WD, Chen K, Ma YQ. Interaction of fullerene chains and a lipid membrane via computer simulations. RSC Adv 2014. [DOI: 10.1039/c4ra04593a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Coarse-grained molecular dynamics simulations were employed to study the fullerene polymers with various functionalization degrees interacting with the DPPC membrane. Structure, dynamics, and thermodynamics of systems were analyzed.
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Affiliation(s)
- Wen-de Tian
- Center for Soft Condensed Matter Physics and Interdisciplinary Research
- Soochow University
- Suzhou 215006, China
| | - Kang Chen
- National Laboratory of Solid State Microstructures and Department of Physics
- Nanjing University
- Nanjing 210093, China
| | - Yu-qiang Ma
- Center for Soft Condensed Matter Physics and Interdisciplinary Research
- Soochow University
- Suzhou 215006, China
- National Laboratory of Solid State Microstructures and Department of Physics
- Nanjing University
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25
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Li T, Ci T, Chen L, Yu L, Ding J. Salt-induced reentrant hydrogel of poly(ethylene glycol)–poly(lactide-co-glycolide) block copolymers. Polym Chem 2014. [DOI: 10.1039/c3py01107k] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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26
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Deng Q, Li H, Li Y, Cao X, Yang Y, Song X. Rheological Properties and Salt Resistance of a Hydrophobically Associating Polyacrylamide. Aust J Chem 2014. [DOI: 10.1071/ch14204] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The rheological properties of electrolyte solution of a hydrophobically associating acrylamide-based copolymer (HA-PAM) containing hydrophobically modified monomer and sodium 2-acrylamido-2-methylpropanesulfonic sulfonate were investigated in this paper. The study mainly focussed on effects of electrolyte concentration, temperature, and shear rate on the solution rheological properties. HA-PAM exhibited much stronger salt tolerance and shearing resistance than the commonly used partially hydrolyzed polyacrylamide, and has great potential for application in tertiary oil recovery of oilfields with high salinity. The salt resistance mechanism of HA-PAM in solution was investigated by combining molecular simulation and experimental methods. The structure–performance relationship of the salt-resisting polymer may provide useful guidance for design and synthesis of novel water-soluble polymers with high salt resistance.
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27
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Choi E, Mondal J, Yethiraj A. Coarse-grained models for aqueous polyethylene glycol solutions. J Phys Chem B 2013; 118:323-9. [PMID: 24350686 DOI: 10.1021/jp408392b] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new coarse-grained force field is developed for polyethylene glycol (PEG) in water. The force field is based on the MARTINI model but with the big multipole water (BMW) model for the solvent. The polymer force field is reparameterized using the MARTINI protocol. The new force field removes the ring-like conformations seen in simulations of short chains with the MARTINI force field; these conformations are not observed in atomistic simulations. We also investigate the effect of using parameters for the end-group that are different from those for the repeat units, with the MARTINI and BMW/MARTINI models. We find that the new BMW/MARTINI force field removes the ring-like conformations seen in the MARTINI models and has more accurate predictions for the density of neat PEG. However, solvent-separated-pairs between chain ends and slow dynamics of the PEG reflect its own artifacts. We also carry out fine-grained simulations of PEG with bundled water clusters and show that the water bundling can lead to ring-like conformations of the polymer molecules. The simulations emphasize the pitfalls of coarse-graining several molecules into one site and suggest that polymer-solvent systems might be a stringent test for coarse-grained force fields.
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Affiliation(s)
- Eunsong Choi
- Department of Physics, and ‡Department of Chemistry, University of Wisconsin , Madison, Wisconsin 53706, United States
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28
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Mondal J, Choi E, Yethiraj A. Atomistic Simulations of Poly(ethylene oxide) in Water and an Ionic Liquid at Room Temperature. Macromolecules 2013. [DOI: 10.1021/ma4016714] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jagannath Mondal
- Department
of Chemistry, Columbia University, 3000 Broadway, New York, New York 10027, United States
| | - Eunsong Choi
- Department
of Physics, University of Wisconsin, Madison, Wisconsin 53706, United States
| | - Arun Yethiraj
- Department
of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, United States
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29
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Nap RJ, Park Y, Wong JY, Szleifer I. Adsorption of acid and polymer coated nanoparticles: a statistical thermodynamics approach. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:14482-14493. [PMID: 24143965 DOI: 10.1021/la403143a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A molecular theoretical description is developed to describe the adsorption of nanoparticles (NPs) that are coated with polymers and functionalized with (surface) acid groups. Results are presented for the adsorption onto both negatively and positively charged surfaces as a function of pH and salt concentration, polymer coating, and NP size. An important finding is that nanoparticles that are coated with weak charge regulating acid molecules such as citric acid develop an asymmetric charge distribution close to a charged surface, due to their finite size. Depending on the sign of the surface charge of the adsorbing surface, a nanoparticle close to the surface either gains more charge or loses charge compared to its "bulk" degree of charge. This in turn influences the amount of NPs that adsorb. The effect of adsorption of negatively charged NPs onto a positively charged surface shows a nonmonotonical variation with pH. The described charging mechanism reveals that details such as size of the NP and acid distribution on the NP need to be considered to provide an accurate understanding of the adsorption process.
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Affiliation(s)
- Rikkert J Nap
- Department of Biomedical Engineering, Department of Chemistry, and Chemistry of Life Processes Institute, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208-3100, United States
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30
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Inal S, Chiappisi L, Kölsch JD, Kraft M, Appavou MS, Scherf U, Wagner M, Hansen MR, Gradzielski M, Laschewsky A, Neher D. Temperature-Regulated Fluorescence and Association of an Oligo(ethyleneglycol)methacrylate-Based Copolymer with a Conjugated Polyelectrolyte—The Effect of Solution Ionic Strength. J Phys Chem B 2013; 117:14576-87. [DOI: 10.1021/jp408864s] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Sahika Inal
- Institute
of Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Str.
24-25, 14476 Potsdam, Germany
| | - Leonardo Chiappisi
- Stranski-Laboratory
for Physical and Theoretical Chemistry, Institute of Chemistry, Technische Universität Berlin, TC7, Str. des 17. Juni 124, 10623 Berlin, Germany
| | - Jonas D. Kölsch
- Institute
of Chemistry, University of Potsdam, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany
| | - Mario Kraft
- Macromolecular
Chemistry Group and Institute for Polymer Technology, Bergische Universität Wuppertal, Gauss-Str. 20, 42097 Wuppertal, Germany
| | - Marie-Sousai Appavou
- Jülich
Centre for Neutron Science (JCNS), Forschungszentrum Jülich
GmbH, Outstation at MLZ, Lichtenbergstr.
1, 85747 Garching, Germany
| | - Ullrich Scherf
- Macromolecular
Chemistry Group and Institute for Polymer Technology, Bergische Universität Wuppertal, Gauss-Str. 20, 42097 Wuppertal, Germany
| | - Manfred Wagner
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Michael Ryan Hansen
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Michael Gradzielski
- Stranski-Laboratory
for Physical and Theoretical Chemistry, Institute of Chemistry, Technische Universität Berlin, TC7, Str. des 17. Juni 124, 10623 Berlin, Germany
| | - André Laschewsky
- Institute
of Chemistry, University of Potsdam, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany
| | - Dieter Neher
- Institute
of Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Str.
24-25, 14476 Potsdam, Germany
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31
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Quan G, Zhu Y, Tong C. The numerical study of the adsorption of bi-disperse flexible polyelectrolytes onto the surface of two charged objects. POLYMER 2013. [DOI: 10.1016/j.polymer.2013.10.017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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32
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Tian WD, Ma YQ. Theoretical and computational studies of dendrimers as delivery vectors. Chem Soc Rev 2013; 42:705-27. [PMID: 23114420 DOI: 10.1039/c2cs35306g] [Citation(s) in RCA: 179] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
It is a great challenge for nanomedicine to develop novel dendrimers with maximum therapeutic potential and minimum side-effects for drug and gene delivery. As delivery vectors, dendrimers must overcome lots of barriers before delivering the bio-agents to the target in the cell. Extensive experimental investigations have been carried out to elucidate the physical and chemical properties of dendrimers and explore their behaviors when interacting with biomolecules, such as gene materials, proteins, and lipid membranes. As a supplement of the experimental techniques, it has been proved that computer simulations could facilitate the progress in understanding the delivery process of bioactive molecules. The structures of dendrimers in dilute solutions have been intensively investigated by monomer-resolved simulations, coarse-grained simulations, and atom-resolved simulations. Atomistic simulations have manifested that the hydrophobic interactions, hydrogen-bond interactions, and electrostatic attraction play critical roles in the formation of dendrimer-drug complexes. Multiscale simulations and statistical field theories have uncovered some physical mechanisms involved in the dendrimer-based gene delivery systems. This review will focus on the current status and perspective of theoretical and computational contributions in this field in recent years. (275 references).
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Affiliation(s)
- Wen-de Tian
- Center for Soft Condensed Matter Physics and Interdisciplinary Research, Soochow University, Suzhou 215006, China
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33
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Llamas S, Mendoza AJ, Guzmán E, Ortega F, Rubio RG. Salt effects on the air/solution interfacial properties of PEO-containing copolymers: equilibrium, adsorption kinetics and surface rheological behavior. J Colloid Interface Sci 2013; 400:49-58. [PMID: 23582902 DOI: 10.1016/j.jcis.2013.03.015] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2013] [Revised: 03/05/2013] [Accepted: 03/06/2013] [Indexed: 10/27/2022]
Abstract
Lithium cations are known to form complexes with the oxygen atoms of poly(oxyethylene) chains. The effect of Li(+) on the surface properties of three block-copolymers containing poly(oxyethylene) (PEO) have been studied. Two types of copolymers have been studied, a water soluble one of the pluronic family, PEO-b-PPO-b-PEO, PPO being poly(propyleneoxyde), and two water insoluble ones: PEO-b-PS and PEO-b-PS-b-PEO, PS being polystyrene. In the case of the pluronic the adsorption kinetics, the equilibrium surface tension isotherm and the aqueous/air surface rheology have been measured, while for the two insoluble copolymers only the surface pressure and the surface rheology have been studied. In all the cases two different Li(+) concentrations have been used. As in the absence of lithium ions, the adsorption kinetics of pluronic solutions shows two processes, and becomes faster as [Li(+)] increases. The kinetics is not diffusion controlled. For a given pluronic concentration the equilibrium surface pressure increases with [Li(+)], and the isotherms show two surface phase transitions, though less marked than for [Li(+)]=0. A similar behavior was found for the equilibrium isotherms of PEO-b-PS and PEO-b-PS-b-PEO. The surface elasticity of these two copolymers was found to increase with [Li(+)] over the whole surface concentration and frequency ranges studied. A smaller effect was found in the case of the pluronic solutions. The results of the pluronic solutions were modeled using a recent theory that takes into account that the molecules can be adsorbed at the surface in two different states. The theory gives a good fit for the adsorption kinetics and a reasonably good prediction of the equilibrium isotherms for low and intermediate concentrations of pluronic. However, the theory is not able to reproduce the isotherm for [Li(+)]=0. Only a semi-quantitative prediction of the surface elasticity is obtained for [pluronic]≤1×10(-3) mM.
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Affiliation(s)
- Sara Llamas
- Departamento de Química Física I, Facultad de Química, Universidad Complutense de Madrid, 28040 Madrid, Spain
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34
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Tong C. The interplay of the polyelectrolyte-surface electrostatic and non-electrostatic interactions in the polyelectrolytes adsorption onto two charged objects – A self-consistent field study. J Chem Phys 2012; 137:104904. [DOI: 10.1063/1.4748815] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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35
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Carlton RJ, Ma CD, Gupta JK, Abbott NL. Influence of specific anions on the orientational ordering of thermotropic liquid crystals at aqueous interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:12796-12805. [PMID: 22866677 PMCID: PMC3448957 DOI: 10.1021/la3024293] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We report that specific anions (of sodium salts) added to aqueous phases at molar concentrations can trigger rapid, orientational ordering transitions in water-immiscible, thermotropic liquid crystals (LCs; e.g., nematic phase of 4'-pentyl-4-cyanobiphenyl, 5CB) contacting the aqueous phases. Anions classified as chaotropic, specifically iodide, perchlorate, and thiocyanate, cause 5CB to undergo continuous, concentration-dependent transitions from planar to homeotropic (perpendicular) orientations at LC-aqueous interfaces within 20 s of addition of the anions. In contrast, anions classified as relatively more kosmotropic in nature (fluoride, sulfate, phosphate, acetate, chloride, nitrate, bromide, and chlorate) do not perturb the LC orientation from that observed without added salts (i.e., planar orientation). Surface pressure-area isotherms of Langmuir films of 5CB supported on aqueous salt solutions reveal ion-specific effects ranking in a manner similar to the LC ordering transitions. Specifically, chaotropic salts stabilized monolayers of 5CB to higher surface pressures and areal densities (12.6 mN/m at 27 Å(2)/molecule for NaClO(4)) and thus smaller molecular tilt angles (30° from the surface normal for NaClO(4)) than kosmotropic salts (5.0 mN/m at 38 Å(2)/molecule with a corresponding tilt angle of 53° for NaCl). These results and others reported herein suggest that anion-specific interactions with 5CB monolayers lead to bulk LC ordering transitions. Support for the proposition that these ion-specific interactions involve the nitrile group was obtained by using a second LC with nitrile groups (E7; ion-specific effects similar to 5CB were observed) and a third LC with fluorine-substituted aromatic groups (TL205; weak dipole and no ion-specific effects were measured). Finally, we also establish that anion-induced orientational transitions in micrometer-thick LC films involve a change in the easy axis of the LC. Overall, these results provide new insights into ionic phenomena occurring at LC-aqueous interfaces, and reveal that the long-range ordering of LC oils can amplify ion-specific interactions at these interfaces into macroscopic ordering transitions.
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36
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Specific thermoresponsiveness of PMMA-block-PDMAEMA to selected ions and other factors in aqueous solution. Colloid Polym Sci 2012. [DOI: 10.1007/s00396-012-2651-9] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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37
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Meyer F, Raquez JM, Verge P, Martínez de Arenaza I, Coto B, Van Der Voort P, Meaurio E, Dervaux B, Sarasua JR, Du Prez F, Dubois P. Poly(ethylene oxide)-b-poly(l-lactide) Diblock Copolymer/Carbon Nanotube-Based Nanocomposites: LiCl as Supramolecular Structure-Directing Agent. Biomacromolecules 2011; 12:4086-94. [DOI: 10.1021/bm201149g] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Franck Meyer
- Laboratory of Polymeric and
Composite Materials, Center of Innovation and Research in Materials
and Polymers (CIRMAP), University of Mons (UMONS), Place du Parc 20, 7000 Mons, Belgium
| | - Jean-Marie Raquez
- Laboratory of Polymeric and
Composite Materials, Center of Innovation and Research in Materials
and Polymers (CIRMAP), University of Mons (UMONS), Place du Parc 20, 7000 Mons, Belgium
| | - Pierre Verge
- Laboratory of Polymeric and
Composite Materials, Center of Innovation and Research in Materials
and Polymers (CIRMAP), University of Mons (UMONS), Place du Parc 20, 7000 Mons, Belgium
| | - Inger Martínez de Arenaza
- Department of Mining-Metallurgy
and Materials Science School of Engineering, University of the Basque Country (EHU-UPV), Alameda de Urquijo
s/n. 48013 Bilbao, Spain
| | - Borja Coto
- Fundacion Tekniker, Avda Otaola 20, 20600
Eibar, Spain
| | - Pascal Van Der Voort
- Centre for
Ordered Materials,
Organometallics and Catalysis (COMOC), Department of Inorganic and
Physical Chemistry, Ghent University, Krijgslaan
281 S3, 9000 Gent, Belgium
| | - Emilio Meaurio
- Department of Mining-Metallurgy
and Materials Science School of Engineering, University of the Basque Country (EHU-UPV), Alameda de Urquijo
s/n. 48013 Bilbao, Spain
| | - Bart Dervaux
- Laboratory of Polymeric and
Composite Materials, Center of Innovation and Research in Materials
and Polymers (CIRMAP), University of Mons (UMONS), Place du Parc 20, 7000 Mons, Belgium
- Polymer Chemistry Research Group,
Department of Organic Chemistry, Ghent University, Krijgslaan 281 S4 bis, 9000 Gent, Belgium
| | - Jose-Ramon Sarasua
- Department of Mining-Metallurgy
and Materials Science School of Engineering, University of the Basque Country (EHU-UPV), Alameda de Urquijo
s/n. 48013 Bilbao, Spain
| | - Filip Du Prez
- Polymer Chemistry Research Group,
Department of Organic Chemistry, Ghent University, Krijgslaan 281 S4 bis, 9000 Gent, Belgium
| | - Philippe Dubois
- Laboratory of Polymeric and
Composite Materials, Center of Innovation and Research in Materials
and Polymers (CIRMAP), University of Mons (UMONS), Place du Parc 20, 7000 Mons, Belgium
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38
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Tong C, Zhu Y, Zhang H, Qiu F, Tang P, Yang Y. The Self-Consistent Field Study of the Adsorption of Flexible Polyelectrolytes onto Two Charged Nano-objects. J Phys Chem B 2011; 115:11307-17. [DOI: 10.1021/jp204904b] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Chaohui Tong
- Department of Physics, Ningbo University, Ningbo, 315211, China
- The Key Laboratory of Molecular Engineering of Polymers, Ministry of Education of China, Fudan University, Shanghai, 200433, China
| | - Yuejin Zhu
- Department of Physics, Ningbo University, Ningbo, 315211, China
- The Key Laboratory of Molecular Engineering of Polymers, Ministry of Education of China, Fudan University, Shanghai, 200433, China
| | - Hongdong Zhang
- Department of Macromolecular Science, Fudan University and the Key Laboratory of Molecular Engineering of Polymers, Ministry of Education of China, Shanghai, 200433, China
| | - Feng Qiu
- Department of Macromolecular Science, Fudan University and the Key Laboratory of Molecular Engineering of Polymers, Ministry of Education of China, Shanghai, 200433, China
| | - Ping Tang
- Department of Macromolecular Science, Fudan University and the Key Laboratory of Molecular Engineering of Polymers, Ministry of Education of China, Shanghai, 200433, China
| | - Yuliang Yang
- Department of Macromolecular Science, Fudan University and the Key Laboratory of Molecular Engineering of Polymers, Ministry of Education of China, Shanghai, 200433, China
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