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Hunter SJ, Abu Elella MH, Johnson EC, Taramova L, Brotherton EE, Armes SP, Khutoryanskiy VV, Smallridge MJ. Mucoadhesive pickering nanoemulsions via dynamic covalent chemistry. J Colloid Interface Sci 2023; 651:334-345. [PMID: 37544222 DOI: 10.1016/j.jcis.2023.07.162] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Revised: 06/29/2023] [Accepted: 07/26/2023] [Indexed: 08/08/2023]
Abstract
HYPOTHESIS Submicron oil droplets stabilized using aldehyde-functionalized nanoparticles should adhere to the primary amine groups present at the surface of sheep nasal mucosal tissue via Schiff base chemistry. EXPERIMENTS Well-defined sterically-stabilized diblock copolymer nanoparticles of 20 nm diameter were prepared in the form of concentrated aqueous dispersions via reversible addition-fragmentation chain transfer (RAFT) aqueous emulsion polymerization of 2,2,2-trifluoroethyl methacrylate (TFEMA) using a water-soluble methacrylic precursor bearing cis-diol groups. Some of these hydroxyl-functional nanoparticles were then selectively oxidized using an aqueous solution of sodium periodate to form a second batch of nanoparticles bearing pendent aldehyde groups within the steric stabilizer chains. Subjecting either hydroxyl- or aldehyde-functional nanoparticles to high-shear homogenization with a model oil (squalane) produced oil-in-water Pickering macroemulsions of 20-30 µm diameter. High-pressure microfluidization of such macroemulsions led to formation of the corresponding Pickering nanoemulsions with a mean droplet diameter of around 200 nm. Quartz crystal microbalance (QCM) experiments were used to examine adsorption of both nanoparticles and oil droplets onto a model planar substrate bearing primary amine groups, while a fluorescence microscopy-based mucoadhesion assay was developed to assess adsorption of the oil droplets onto sheep nasal mucosal tissue. FINDINGS Squalane droplets coated with aldehyde-functional nanoparticles adhered significantly more strongly to sheep nasal mucosal tissue than those coated with the corresponding hydroxyl-functional nanoparticles. This difference was attributed to the formation of surface imine bonds via Schiff base chemistry and was also observed for the two types of nanoparticles alone in QCM studies. Preliminary biocompatibility studies using planaria indicated only mild toxicity for these new mucoadhesive Pickering nanoemulsions, suggesting potential applications for the localized delivery of hydrophobic drugs.
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Affiliation(s)
- Saul J Hunter
- Dainton Building, Department of Chemistry, University of Sheffield, Brook Hill, Sheffield, South Yorkshire S3 7HF, UK
| | - Mahmoud H Abu Elella
- Reading School of Pharmacy, University of Reading, Whiteknights, Reading RG6 6AD, UK; Chemistry Department, Faculty of Science, Cairo University, Giza 12613, Egypt
| | - Edwin C Johnson
- Dainton Building, Department of Chemistry, University of Sheffield, Brook Hill, Sheffield, South Yorkshire S3 7HF, UK
| | - Laura Taramova
- Reading School of Pharmacy, University of Reading, Whiteknights, Reading RG6 6AD, UK
| | - Emma E Brotherton
- Dainton Building, Department of Chemistry, University of Sheffield, Brook Hill, Sheffield, South Yorkshire S3 7HF, UK
| | - Steven P Armes
- Dainton Building, Department of Chemistry, University of Sheffield, Brook Hill, Sheffield, South Yorkshire S3 7HF, UK.
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2
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György C, Kirkman PM, Neal TJ, Chan DHH, Williams M, Smith T, Growney DJ, Armes SP. Enhanced Adsorption of Epoxy-Functional Nanoparticles onto Stainless Steel Significantly Reduces Friction in Tribological Studies. Angew Chem Int Ed Engl 2023; 62:e202218397. [PMID: 36651475 PMCID: PMC10962596 DOI: 10.1002/anie.202218397] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Revised: 01/16/2023] [Accepted: 01/18/2023] [Indexed: 01/19/2023]
Abstract
Epoxy-functional sterically-stabilized diblock copolymer nanoparticles (ca. 27 nm) are prepared via RAFT dispersion polymerization in mineral oil. Nanoparticle adsorption onto stainless steel is examined using a quartz crystal microbalance. Incorporating epoxy groups within the steric stabilizer chains results in a two-fold increase in the adsorbed amount, Γ, at 20 °C (7.6 mg m-2 ) compared to epoxy-core functional nanoparticles (3.7 mg m-2 ) or non-functional nanoparticles (3.8 mg m-2 ). A larger difference in Γ is observed at 40 °C; this suggests chemical adsorption of the nanoparticles rather than merely physical adsorption. A remarkable near five-fold increase in Γ is observed for ca. 50 nm epoxy-functional nanoparticles compared to non-functional nanoparticles (31.3 vs. 6.4 mg m-2 , respectively). Tribological studies confirm that chemical adsorption of the latter epoxy-functional nanoparticles leads to a significant reduction in friction between 60 °C and 120 °C.
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Affiliation(s)
- Csilla György
- Dainton BuildingDepartment of ChemistryUniversity of SheffieldSheffieldSouth YorkshireS3 7HFUK
| | | | - Thomas J. Neal
- Dainton BuildingDepartment of ChemistryUniversity of SheffieldSheffieldSouth YorkshireS3 7HFUK
| | - Derek H. H. Chan
- Dainton BuildingDepartment of ChemistryUniversity of SheffieldSheffieldSouth YorkshireS3 7HFUK
| | | | | | | | - Steven P. Armes
- Dainton BuildingDepartment of ChemistryUniversity of SheffieldSheffieldSouth YorkshireS3 7HFUK
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3
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Patel V, Parekh P, Khimani M, Yusa SI, Bahadur P. Pluronics® based Penta Block Copolymer micelles as a precursor of smart aggregates for various applications: A review. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.121140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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4
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Han J, Xia Y, Cheng F, Peng L, He W. Mechanistic understanding of the discrete morphology formed by multi-cycle assembly of tannic acid with Poloxamer 188 on silicon using QMC-D. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.127302] [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]
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5
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Parekh P, Ohno S, Yusa S, Lv C, Du B, Ray D, Aswal VK, Bahadur P. Synthesis, aggregation and adsorption behaviour of a thermoresponsive pentablock copolymer. POLYM INT 2020. [DOI: 10.1002/pi.5967] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Paresh Parekh
- Chemistry Department Veer Narmad South Gujarat University Surat India
| | - Sayaka Ohno
- Graduate School of Engineering University of Hyogo Hyogo Japan
| | - Shin‐ichi Yusa
- Graduate School of Engineering University of Hyogo Hyogo Japan
| | - Chao Lv
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering Zhejiang University Hangzhou China
| | - Binyang Du
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering Zhejiang University Hangzhou China
| | - Debes Ray
- Solid State Physics Division Bhabha Atomic Research Centre Mumbai India
| | - Vinod Kumar Aswal
- Solid State Physics Division Bhabha Atomic Research Centre Mumbai India
| | - Pratap Bahadur
- Chemistry Department Veer Narmad South Gujarat University Surat India
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6
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Papadakis CM, Müller-Buschbaum P, Laschewsky A. Switch It Inside-Out: "Schizophrenic" Behavior of All Thermoresponsive UCST-LCST Diblock Copolymers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:9660-9676. [PMID: 31314540 DOI: 10.1021/acs.langmuir.9b01444] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
This feature article reviews our recent advancements on the synthesis, phase behavior, and micellar structures of diblock copolymers consisting of oppositely thermoresponsive blocks in aqueous environments. These copolymers combine a nonionic block, which shows lower critical solution temperature (LCST) behavior, with a zwitterionic block that exhibits an upper critical solution temperature (UCST). The transition temperature of the latter class of polymers is strongly controlled by its molar mass and by the salt concentration, in contrast to the rather invariant transition of nonionic polymers with type II LCST behavior such as poly(N-isopropylacrylamide) or poly(N-isopropyl methacrylamide). This allows for implementing the sequence of the UCST and LCST transitions of the polymers at will by adjusting either molecular or, alternatively, physical parameters. Depending on the location of the transition temperatures of both blocks, different switching scenarios are realized from micelles to inverse micelles, namely via the molecularly dissolved state, the aggregated state, or directly. In addition to studies of (semi)dilute aqueous solutions, highly concentrated systems have also been explored, namely water-swollen thin films. Concerning applications, we discuss the possible use of the diblock copolymers as "smart" nanocarriers.
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Affiliation(s)
- Christine M Papadakis
- Fachgebiet Physik weicher Materie/Lehrstuhl für Funktionelle Materialien, Physik-Department , Technische Universität München , James-Franck-Straße 1 , 85748 Garching , Germany
| | - Peter Müller-Buschbaum
- Fachgebiet Physik weicher Materie/Lehrstuhl für Funktionelle Materialien, Physik-Department , Technische Universität München , James-Franck-Straße 1 , 85748 Garching , Germany
- Heinz Maier-Leibnitz Zentrum (MLZ) , Lichtenbergstraße 1 , 85748 Garching , Germany
| | - André Laschewsky
- Institut für Chemie , Universität Potsdam , Karl-Liebknecht straße 24-25 , 14476 Potsdam-Golm , Germany
- Fraunhofer Institute for Applied Polymer Research IAP , Geiselbergstraße 69 , 14476 Potsdam-Golm , Germany
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7
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Li L, Li NK, Tu Q, Im O, Mo CK, Han W, Fuss WH, Carroll NJ, Chilkoti A, Yingling YG, Zauscher S, López GP. Functional Modification of Silica through Enhanced Adsorption of Elastin-Like Polypeptide Block Copolymers. Biomacromolecules 2018; 19:298-306. [PMID: 29195275 PMCID: PMC5809277 DOI: 10.1021/acs.biomac.7b01307] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A powerful tool for controlling interfacial properties and molecular architecture relies on the tailored adsorption of stimuli-responsive block copolymers onto surfaces. Here, we use computational and experimental approaches to investigate the adsorption behavior of thermally responsive polypeptide block copolymers (elastin-like polypeptides, ELPs) onto silica surfaces, and to explore the effects of surface affinity and micellization on the adsorption kinetics and the resultant polypeptide layers. We demonstrate that genetic incorporation of a silica-binding peptide (silaffin R5) results in enhanced adsorption of these block copolymers onto silica surfaces as measured by quartz crystal microbalance and ellipsometry. We find that the silaffin peptide can also direct micelle adsorption, leading to close-packed micellar arrangements that are distinct from the sparse, patchy arrangements observed for ELP micelles lacking a silaffin tag, as evidenced by atomic force microscopy measurements. These experimental findings are consistent with results of dissipative particle dynamics simulations. Wettability measurements suggest that surface immobilization hampers the temperature-dependent conformational change of ELP micelles, while adsorbed ELP unimers (i.e., unmicellized block copolymers) retain their thermally responsive property at interfaces. These observations provide guidance on the use of ELP block copolymers as building blocks for fabricating smart surfaces and interfaces with programmable architecture and functionality.
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Affiliation(s)
- Linying Li
- Department of Biomedical Engineering, Duke University, Durham NC 27708, U.S.A
- NSF Research Triangle Materials Research Science and Engineering Center, Durham NC 27708, U.S.A
| | - Nan K. Li
- Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695, U.S.A
- NSF Research Triangle Materials Research Science and Engineering Center, Durham NC 27708, U.S.A
| | - Qing Tu
- Department of Mechanical Engineering and Materials Science, Duke University, Durham NC 27708, U.S.A
| | - Owen Im
- Department of Biomedical Engineering, Duke University, Durham NC 27708, U.S.A
| | - Chia-Kuei Mo
- Department of Biomedical Engineering, Duke University, Durham NC 27708, U.S.A
| | - Wei Han
- Department of Biomedical Engineering, Duke University, Durham NC 27708, U.S.A
- NSF Research Triangle Materials Research Science and Engineering Center, Durham NC 27708, U.S.A
| | - William H. Fuss
- Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695, U.S.A
| | - Nick J. Carroll
- Department of Biomedical Engineering, Duke University, Durham NC 27708, U.S.A
- NSF Research Triangle Materials Research Science and Engineering Center, Durham NC 27708, U.S.A
| | - Ashutosh Chilkoti
- Department of Biomedical Engineering, Duke University, Durham NC 27708, U.S.A
- Department of Mechanical Engineering and Materials Science, Duke University, Durham NC 27708, U.S.A
- NSF Research Triangle Materials Research Science and Engineering Center, Durham NC 27708, U.S.A
| | - Yaroslava G. Yingling
- Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695, U.S.A
- NSF Research Triangle Materials Research Science and Engineering Center, Durham NC 27708, U.S.A
| | - Stefan Zauscher
- Department of Mechanical Engineering and Materials Science, Duke University, Durham NC 27708, U.S.A
- NSF Research Triangle Materials Research Science and Engineering Center, Durham NC 27708, U.S.A
| | - Gabriel P. López
- Department of Biomedical Engineering, Duke University, Durham NC 27708, U.S.A
- Department of Mechanical Engineering and Materials Science, Duke University, Durham NC 27708, U.S.A
- NSF Research Triangle Materials Research Science and Engineering Center, Durham NC 27708, U.S.A
- Center for Biomedical Engineering, Department of Chemical and Biological Engineering, University of New Mexico, Albuquerque, NM 87131, U.S.A
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8
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Yu Z, Lin S, Liu G, Hu J, Zhang P, Tu Y, Zou H, Wei Y, Gao Z. Highly dispersible silver nanowires via a diblock copolymer approach for potential application in transparent conductive composites. NEW J CHEM 2017. [DOI: 10.1039/c7nj00178a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A facile and reproducible strategy for fabricating highly dispersible silver nanowires (AgNWs) in nonalcoholic organic solvents using diblock copolymer micelles.
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Affiliation(s)
- Zhiwei Yu
- Guangzhou Institute of Chemistry
- Chinese Academy of Sciences
- Guangzhou
- P. R. China
- Key Laboratory of Cellulose and Lignocellulosics Chemistry, Chinese Academy of Sciences
| | - Shudong Lin
- Guangzhou Institute of Chemistry
- Chinese Academy of Sciences
- Guangzhou
- P. R. China
- Key Laboratory of Cellulose and Lignocellulosics Chemistry, Chinese Academy of Sciences
| | - Guojun Liu
- Guangzhou Institute of Chemistry
- Chinese Academy of Sciences
- Guangzhou
- P. R. China
- Key Laboratory of Cellulose and Lignocellulosics Chemistry, Chinese Academy of Sciences
| | - Jiwen Hu
- Guangzhou Institute of Chemistry
- Chinese Academy of Sciences
- Guangzhou
- P. R. China
- Key Laboratory of Cellulose and Lignocellulosics Chemistry, Chinese Academy of Sciences
| | - Pei Zhang
- Guangzhou Institute of Chemistry
- Chinese Academy of Sciences
- Guangzhou
- P. R. China
- Key Laboratory of Cellulose and Lignocellulosics Chemistry, Chinese Academy of Sciences
| | - Yuanyuan Tu
- Guangzhou Institute of Chemistry
- Chinese Academy of Sciences
- Guangzhou
- P. R. China
- Key Laboratory of Cellulose and Lignocellulosics Chemistry, Chinese Academy of Sciences
| | - Hailiang Zou
- Guangzhou Institute of Chemistry
- Chinese Academy of Sciences
- Guangzhou
- P. R. China
- Key Laboratory of Cellulose and Lignocellulosics Chemistry, Chinese Academy of Sciences
| | - Yanlong Wei
- Guangzhou Institute of Chemistry
- Chinese Academy of Sciences
- Guangzhou
- P. R. China
- Key Laboratory of Cellulose and Lignocellulosics Chemistry, Chinese Academy of Sciences
| | - Zhenzhong Gao
- College of Materials and Energy
- South China Agriculture University
- Guangzhou
- P. R. China
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9
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Yang YL, Tsao HK, Sheng YJ. Solid-supported polymer bilayers formed by coil-coil block copolymers. SOFT MATTER 2016; 12:6442-6450. [PMID: 27418114 DOI: 10.1039/c6sm00741d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The formation and physical properties of solid-supported polymer bilayers (SPBs) on an adhesive substrate have been explored by dissipative particle dynamics simulations. A SPB is developed by the adsorption of vesicles formed by diblock copolymers in a selective solvent. The adsorbed vesicle can remain intact or become ruptured into a SPB, depending on the interaction between solvophobic blocks and solvent and the interaction between solvophilic blocks and the substrate. The morphological phase diagram of adsorbed vesicles is acquired. The influence of polymer adhesion strength and solvophobicity on the geometrical and mechanical properties of a SPB is systematically studied as well. It is found that vesicular disruption is easily triggered for strong adhesion strength. Moreover, for strong adhesion strength and weak solvophobicity, the fluctuation of membrane height is impeded while the area of fluctuation is enhanced.
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Affiliation(s)
- Yan-Ling Yang
- Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan 106, Republic of China.
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10
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Li J, Zhang Z, Zhou X, Chen T, Nie J, Du B. PNIPAmx–PPO36–PNIPAmx thermo-sensitive triblock copolymers: chain conformation and adsorption behavior on a hydrophobic gold surface. Phys Chem Chem Phys 2016; 18:519-28. [DOI: 10.1039/c5cp06079f] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The presence of the PNIPAm block is not a sufficient condition for the complex adsorption behavior of PNIPAmx–PPO36–PNIPAmx triblock copolymers.
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Affiliation(s)
- Jianyuan Li
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization
- Department of Polymer Science & Engineering
- Zhejiang University
- Hangzhou 310027
- China
| | - Zhijun Zhang
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization
- Department of Polymer Science & Engineering
- Zhejiang University
- Hangzhou 310027
- China
| | - Xianjing Zhou
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization
- Department of Polymer Science & Engineering
- Zhejiang University
- Hangzhou 310027
- China
| | - Tongquan Chen
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization
- Department of Polymer Science & Engineering
- Zhejiang University
- Hangzhou 310027
- China
| | - Jingjing Nie
- Department of Chemistry
- Zhejiang University
- Hangzhou 310027
- China
| | - Binyang Du
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization
- Department of Polymer Science & Engineering
- Zhejiang University
- Hangzhou 310027
- China
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12
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Chen T, Lu Y, Chen T, Zhang X, Du B. Adsorption of PNIPAmx-PEO20-PPO70-PEO20-PNIPAmx pentablock terpolymer on gold surfaces: effects of concentration, temperature, block length, and surface properties. Phys Chem Chem Phys 2014; 16:5536-44. [DOI: 10.1039/c3cp54535k] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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13
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Holappa S, Kontturi KS, Salminen A, Seppälä J, Laine J. Adsorption of hydrophobically end-capped poly(ethylene glycol) on cellulose. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:13750-13759. [PMID: 24117230 DOI: 10.1021/la402494m] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Adsorption of poly(ethylene glycol), hydrophobically end-capped with octadecenylsuccinic anhydride (OSA-PEG-OSA), on an ultrathin film of cellulose has been studied by quartz crystal microbalance with dissipation monitoring (QCM-D) and atomic force microscopy (AFM). Normally, PEG does not adsorb on cellulosic surfaces, but the use of the telechelic hydrophobic modification was found to promote adsorption. The influence of the conformation of the polymer in solution prior to adsorption and the subsequent properties of the adsorbed layer were investigated. The adsorption experiments were done at concentrations below and above the critical association concentration. The adsorption of OSA-PEG-OSA on cellulose was observed to occur in four distinct stages. Because of the amphiphilic nature of cellulose, further adsorption experiments were performed on hydrophobic (polystyrene) and hydrophilic (silica) model substrates to illuminate the contribution of hydrophobic and hydrophilic factors in the adsorption phenomenon. As expected, the kinetics and the mechanism of adsorption were strongly dependent on the chemical composition of the substrate.
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Affiliation(s)
- Susanna Holappa
- Department of Forest Products Technology, Aalto University School of Chemical Technology , P.O. Box 16300, FI-00076 Aalto, Finland
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14
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Peng B, Chu X, Li Y, Li D, Chen Y, Zhao J. Adsorption kinetics and stability of poly(ethylene oxide)-block-polystyrene micelles on polystyrene surface. POLYMER 2013. [DOI: 10.1016/j.polymer.2013.08.064] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Lu Y, Zhang X, Fan Z, Du B. Adsorption of PNIPAm110-PEO100-PPO65-PEO100-PNIPAm110 pentablock terpolymer on hydrophobic gold. POLYMER 2012. [DOI: 10.1016/j.polymer.2012.06.022] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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16
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Becker B, Cooper MA. A survey of the 2006-2009 quartz crystal microbalance biosensor literature. J Mol Recognit 2011; 24:754-87. [DOI: 10.1002/jmr.1117] [Citation(s) in RCA: 138] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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17
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Ye X, Fei J, Xu K, Bai R. Effect of polystyrene-b-poly(ethylene oxide) on self-assembly of polystyrene-b-poly(N-isopropylacrylamide) in aqueous solution. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/polb.22006] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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18
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Lu D, Tao K, Wang Y, Bai R. Synthesis, characterization, and self‐assembly of ion‐bonded A
2
B rod‐coil copolymer with oligo(
para
‐phenyleneethynylene) as rod segment. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/pola.23067] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Dairen Lu
- CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, People's Republic of China
| | - Kang Tao
- CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, People's Republic of China
| | - Yun Wang
- CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, People's Republic of China
| | - Ruke Bai
- CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, People's Republic of China
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Palmqvist L, Holmberg K. Dispersant adsorption and viscoelasticity of alumina suspensions measured by quartz crystal microbalance with dissipation monitoring and in situ dynamic rheology. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:9989-9996. [PMID: 18707142 DOI: 10.1021/la800719u] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Adsorption behavior and water content of adsorbed layers of four dispersants for aqueous ceramic processing were studied by quartz crystal microbalance with dissipation monitoring (QCM-D) on alumina surfaces. The dispersants were a poly(acrylic acid), a lignosulfonate, and two hydrophilic comb copolymers with nonionic polyoxyethylene chains of different molecular weights. A Voigt model was applied to analyze the viscoelastic behavior of the adsorbed dispersant layers. The results from QCM-D were compared with viscoelastic properties determined by in situ dynamic rheology measurements of highly concentrated alumina suspensions during slip casting. The QCM-D results showed that both the poly(acrylic acid) and the lignosulfonate adsorbed in low amounts and in a flat conformation, which generated thin, highly rigid layers less than 1 nm thick. The water content of these layers was found to be around 30% for the lignosulfonate and 35% for the poly(acrylic acid). High casting rate and strength in terms of storage modulus were observed in the final consolidate of the suspensions with the two polyelectrolytes. In contrast, the high molecular weight comb copolymer adsorbed in a less elastic layer with a thickness of about 6 nm, which is enough to provide steric stabilization. The viscous behavior of this layer was attributed to high water content, which was calculated to be around 90%. Such a water-rich layer gives a lubrication effect, which allows for reorientation of particles during the consolidation process, resulting in a high final strength of the ceramic material. During consolidation, the suspension showed a slow casting rate, most likely due to rearrangement facilitated by the lubricating layer. The short-chain comb copolymer adsorbed in a 1.5 nm thick, rigid layer and gave low final strength to the consolidated suspension. It is likely that the poor consolidation behavior is caused by flocculation due to insufficient stabilization of the dispersion.
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20
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The collapse transition of poly(styrene-b-(N-isopropyl acrylamide)) diblock copolymers in aqueous solution and in thin films. Colloid Polym Sci 2008. [DOI: 10.1007/s00396-008-1871-5] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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21
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Wang W, Troll K, Kaune G, Metwalli E, Ruderer M, Skrabania K, Laschewsky A, Roth SV, Papadakis CM, Müller-Buschbaum P. Thin Films of Poly(N-isopropylacrylamide) End-Capped with n-Butyltrithiocarbonate. Macromolecules 2008. [DOI: 10.1021/ma7027775] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- W. Wang
- Physik-Department LS E13, TU München, James-Franck-Str. 1, 85747 Garching, Germany; Inst. Chemie, Potsdam Universität, Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm, Germany; and HASYLAB at DESY, Notkestr. 85, 22603 Hamburg, Germany
| | - K. Troll
- Physik-Department LS E13, TU München, James-Franck-Str. 1, 85747 Garching, Germany; Inst. Chemie, Potsdam Universität, Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm, Germany; and HASYLAB at DESY, Notkestr. 85, 22603 Hamburg, Germany
| | - G. Kaune
- Physik-Department LS E13, TU München, James-Franck-Str. 1, 85747 Garching, Germany; Inst. Chemie, Potsdam Universität, Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm, Germany; and HASYLAB at DESY, Notkestr. 85, 22603 Hamburg, Germany
| | - E. Metwalli
- Physik-Department LS E13, TU München, James-Franck-Str. 1, 85747 Garching, Germany; Inst. Chemie, Potsdam Universität, Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm, Germany; and HASYLAB at DESY, Notkestr. 85, 22603 Hamburg, Germany
| | - M. Ruderer
- Physik-Department LS E13, TU München, James-Franck-Str. 1, 85747 Garching, Germany; Inst. Chemie, Potsdam Universität, Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm, Germany; and HASYLAB at DESY, Notkestr. 85, 22603 Hamburg, Germany
| | - K. Skrabania
- Physik-Department LS E13, TU München, James-Franck-Str. 1, 85747 Garching, Germany; Inst. Chemie, Potsdam Universität, Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm, Germany; and HASYLAB at DESY, Notkestr. 85, 22603 Hamburg, Germany
| | - A. Laschewsky
- Physik-Department LS E13, TU München, James-Franck-Str. 1, 85747 Garching, Germany; Inst. Chemie, Potsdam Universität, Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm, Germany; and HASYLAB at DESY, Notkestr. 85, 22603 Hamburg, Germany
| | - S. V. Roth
- Physik-Department LS E13, TU München, James-Franck-Str. 1, 85747 Garching, Germany; Inst. Chemie, Potsdam Universität, Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm, Germany; and HASYLAB at DESY, Notkestr. 85, 22603 Hamburg, Germany
| | - C. M. Papadakis
- Physik-Department LS E13, TU München, James-Franck-Str. 1, 85747 Garching, Germany; Inst. Chemie, Potsdam Universität, Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm, Germany; and HASYLAB at DESY, Notkestr. 85, 22603 Hamburg, Germany
| | - P. Müller-Buschbaum
- Physik-Department LS E13, TU München, James-Franck-Str. 1, 85747 Garching, Germany; Inst. Chemie, Potsdam Universität, Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm, Germany; and HASYLAB at DESY, Notkestr. 85, 22603 Hamburg, Germany
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Shen W, Wang H, Peng H, Nie L, Chen D, Jiang M. Facile preparation of stabilized polymeric nanotubes using sacrificial yttrium hydroxide nanotubes as template and block copolymer micelles as precursor. Chem Commun (Camb) 2007:2360-2. [PMID: 17844746 DOI: 10.1039/b701256j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report here facile preparation of stabilized polymeric nanotubes with a hair-like shell using yttrium hydroxide nanotubes as the sacrificial template and block copolymer micelles as the precursor, and orientation of the polymeric nanotubes encapsulating magnetic particles under magnetic field.
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Affiliation(s)
- Wenming Shen
- Department of Macromolecular Science, Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai 200433, China
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