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Nagy B, Ekblad T, Fragneto G, Ederth T. Structure of Self-Initiated Photopolymerized Films: A Comparison of Models. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:14004-14015. [PMID: 36377414 PMCID: PMC9671054 DOI: 10.1021/acs.langmuir.2c02396] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Revised: 10/18/2022] [Indexed: 06/16/2023]
Abstract
Self-initiated photografting and photopolymerization (SI-PGP) uses UV illumination to graft polymers to surfaces without additional photoinitiators using the monomers as initiators, "inimers". A wider use of this method is obstructed by a lack of understanding of the resulting, presumably heterogeneous, polymer structure and of the parallel degradation under continuous UV illumination. We have used neutron reflectometry to investigate the structure of hydrated SI-PGP-prepared poly(HEMA-co-PEG10MA) (poly(2-hydroxyethyl methacrylate-co-(ethylene glycol)10 methacrylate)) films and compared parabolic, sigmoidal, and Gaussian models for the polymer volume fraction distributions. Results from fitting these models to the data suggest that either model can be used to approximate the volume fraction profile to similar accuracy. In addition, a second layer of deuterated poly(methacrylic acid) (poly(dMAA)) was grafted over the existing poly(HEMA-co-PEG10MA) layer, and the resulting double-grafted films were also studied by neutron reflectometry to shed light on the UV-polymerization process and the inevitable UV-induced degradation which competes with the grafting.
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Affiliation(s)
- Béla Nagy
- Division
of Biophysics and Bioengineering, Department of Physics, Chemistry
and Biology, Linköping University, SE-581 83Linköping, Sweden
| | - Tobias Ekblad
- Division
of Biophysics and Bioengineering, Department of Physics, Chemistry
and Biology, Linköping University, SE-581 83Linköping, Sweden
| | - Giovanna Fragneto
- Institut
Laue-Langevin, 71 avenue des Martyrs, BP 156, 38042Grenoble, France
| | - Thomas Ederth
- Division
of Biophysics and Bioengineering, Department of Physics, Chemistry
and Biology, Linköping University, SE-581 83Linköping, Sweden
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2
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Liu X, Claesson PM. Bioinspired Bottlebrush Polymers for Aqueous Boundary Lubrication. Polymers (Basel) 2022; 14:2724. [PMID: 35808769 PMCID: PMC9269121 DOI: 10.3390/polym14132724] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Revised: 06/30/2022] [Accepted: 07/01/2022] [Indexed: 01/30/2023] Open
Abstract
An extremely efficient lubrication system is achieved in synovial joints by means of bio-lubricants and sophisticated nanostructured surfaces that work together. Molecular bottlebrush structures play crucial roles for this superior tribosystem. For example, lubricin is an important bio-lubricant, and aggrecan associated with hyaluronan is important for the mechanical response of cartilage. Inspired by nature, synthetic bottlebrush polymers have been developed and excellent aqueous boundary lubrication has been achieved. In this review, we summarize recent experimental investigations of the interfacial lubrication properties of surfaces coated with bottlebrush bio-lubricants and bioinspired bottlebrush polymers. We also discuss recent advances in understanding intermolecular synergy in aqueous lubrication including natural and synthetic polymers. Finally, opportunities and challenges in developing efficient aqueous boundary lubrication systems are outlined.
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Affiliation(s)
- Xiaoyan Liu
- School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi’an 710062, China
| | - Per M. Claesson
- Division of Surface and Corrosion Science, Department of Chemistry, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden;
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3
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Fabrication and Phase Behavior of Thermo- and/or pH-Responsive Polymer-Grafted SiO2 Nanoparticles. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12083799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Three series of thermo- and/or pH-responsive polymer-grafted SiO2 nanoparticles, SiO2-graft-poly(oligo(ethylene glycol) methacrylate) (SiO2-g-POEGMA), SiO2-graft-poly(acrylic acid) (SiO2-g-PAA) and SiO2-graft-poly(oligo(ethylene glycol) methacrylate-state-acrylic acid (SiO2-g-P(OEGMA-stat-AA)), were prepared by grafting POEGMA and/or PAA onto the surface of silica nanoparticles through the surface-initiated atom transfer radical polymerization (SI-ATRP). The lower critical solution temperature (LCST) of SiO2-g-POEGMA (MOEGMA = 300 g/mol) was found to be 64 °C. For SiO2-g-PAA nanoparticles, at the pH range from 8 to 12, the hydrodynamic diameter of the nanoparticles increases with increasing pH, and the zeta potential of SiO2-g-PAA nanoparticles is negatively charged and decreases with increasing pH. Owing to the thermo- and pH-responsive, the hydrodynamic diameters of SiO2-g-P(OEGMA-stat-AA) nanoparticles increase with the increasing pH, and the LCSTs of those nanoparticles increase with the increase of POEGMA content.
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4
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Alipoormazandarani N, Fokkink R, Fatehi P. Deposition behavior of lignin on solid surfaces assessed by stagnation point adsorption reflectometry. RSC Adv 2021; 11:16980-16988. [PMID: 35479723 PMCID: PMC9032271 DOI: 10.1039/d1ra02248b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2021] [Accepted: 04/22/2021] [Indexed: 11/28/2022] Open
Abstract
The deposition behavior of lignin on a solid surface was studied using stagnation point adsorption reflectometry (SPAR) comprehensively. In this study, the light absorption coefficient of lignin (τ = 20 476 m-1) at 633 nm wavelength was considered to define a new imaginary refractive index (k) used in the SPAR technique for adsorption analysis. The inclusion of k in the adsorption model yielded an adsorbed amount (Γ) of 1.11 mg m-2, leading to the quality factor (Q f) of 31.71 mg m-2. At a lower concentration, the deposition of lignin on the surface was increased, and it generated a maximum sticking coefficient of β = 0.71 at 25 mg L-1 on the surface. At the concentration range of 35 and 45 mg L-1, lignin formed clusters and its deposition dropped. The use of Quartz crystal microbalance (QCM) and SPAR techniques also confirmed that the proportion of water in the deposited lignin adlayer was greater when a lower concentration (5-25 mg L-1) of lignin solution was used for adsorption. The findings of this study revealed the potential use of the SPAR technique for evaluating the deposition performance of lignin-based materials on varied surfaces, which would facilitate the development of coating and composite applications for lignin.
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Affiliation(s)
| | - Remco Fokkink
- Laboratory of Physical Chemistry and Soft Matter, Wageningen University & Research The Netherlands
| | - Pedram Fatehi
- Chemical Engineering Department, Lakehead University Thunder Bay Canada
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5
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6
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Liu X, Feilberg KL, Yan W, Stenby EH, Thormann E. Interactions between apolar, basic and acidic model oils and a calcite surface. J DISPER SCI TECHNOL 2018. [DOI: 10.1080/01932691.2018.1523012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Xiaoyan Liu
- Department of Chemistry, Technical University of Denmark, Kongens Lyngby, Denmark
- Centre for Olie og Gas - Technical University of Denmark, Kongens Lyngby, Denmark
- Key Laboratory of Applied Surface and Colloid Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi’an, China
| | - Karen L. Feilberg
- Centre for Olie og Gas - Technical University of Denmark, Kongens Lyngby, Denmark
| | - Wei Yan
- Department of Chemistry, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Erling H. Stenby
- Department of Chemistry, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Esben Thormann
- Department of Chemistry, Technical University of Denmark, Kongens Lyngby, Denmark
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7
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Huang J, Liu X, Thormann E. Surface Forces between Highly Charged Cationic Polyelectrolytes Adsorbed to Silica: How Control of pH and the Adsorbed Amount Determines the Net Surface Charge. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:7264-7271. [PMID: 29864283 DOI: 10.1021/acs.langmuir.8b00909] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Atomic force microscopy (AFM) and quartz crystal microbalance with dissipation (QCM-D) were employed to investigate the pH-dependent adsorption of poly(diallyldimethylammonium chloride) (polyDADMAC) to silica surfaces as well as the surface forces between these layers. It was found that polyDADMAC adopted a relatively flat conformation when adsorbed to a silica surface and that the adsorbed amount increased with increasing pH. From the surface force measurements it is evident that the surface undergoes a charge reversal upon saturation with polyDADMAC, at the three different investigated pH values, and that some degree of charge regulation of the silica surface takes place during the adsorption process. Finally, the overcharging phenomenon is discussed in terms of a geometrical mismatch due to the different average spacing between the surface charges on the silica surface and the size of the DADMAC monomer.
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8
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Mansour OT, Cattoz B, Beaube M, Montagnon M, Heenan RK, Schweins R, Appavou MS, Griffiths PC. Assembly of small molecule surfactants at highly dynamic air-water interfaces. SOFT MATTER 2017; 13:8807-8815. [PMID: 29139528 DOI: 10.1039/c7sm01914a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Small-angle neutron scattering has been used to probe the interfacial structure of foams stabilised by small molecule surfactants at concentrations well below their critical micelle concentration. The data for wet foams showed a pronounced Q-4 dependence at low Q and noticeable inflexions over the mid Q range. These features were found to be dependent on the surfactant structure (mainly the alkyl chain length) with various inflexions across the measured Q range as a function of the chain length but independent of factors such as concentration and foam age/height. By contrast, foam stability (for C < CMC) was significantly different at this experimental range. Drained foams showed different yet equally characteristic features, including additional peaks attributed to the formation of classical micellar structures. Together, these features suggest the dynamic air-water interface is not as simple as often depicted, indeed the data have been successfully described by a model consisting paracrystalline stacks (multilayer) of adsorbed surfactant layers; a structure that we believe is induced by the dynamic nature of the air-water interface in a foam.
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Affiliation(s)
- Omar T Mansour
- Faculty of Engineering and Science, University of Greenwich, Medway Campus, Central Avenue, Chatham Maritime, Kent, ME4 4TB, UK.
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9
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Liu X, Feilberg KL, Yan W, Stenby EH, Thormann E. Electrical Double-Layer and Ion Bridging Forces between Symmetric and Asymmetric Charged Surfaces in the Presence of Mono- and Divalent Ions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:4426-4434. [PMID: 28430450 DOI: 10.1021/acs.langmuir.7b00450] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
An atomic force microscope, employing the colloidal probe technique, was used to study the interactions between six different combinations of silane-functionalized silica surfaces in NaCl and CaCl2 solutions. The surfaces consisted of monolayers of the apolar trimethoxy(octyl)silane, the positively charged (3-aminopropyl)trimethoxysilane, and the negatively charged (3-mercaptopropyl)trimethoxysilane. The interactions between the three symmetric systems, as well as between the three asymmetric combinations of surfaces, were measured and compared to calculated electrical double-layer forces. The results demonstrated that the long-range interactions between the surfaces in all cases were dominated by double-layer forces, while short-range interactions, including adhesion, were dominated by ion bridging forces in the cases where both interaction surfaces favored adsorption of calcium ions. The study thus also demonstrates how surface force studies in mono- and divalent salt solutions can be used as an analytical tool for probing specific functional groups on heterogeneous surfaces.
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Affiliation(s)
- Xiaoyan Liu
- Department of Chemistry and ‡Centre for Oil and Gas, Technical University of Denmark , 2800 Kongens Lyngby, Denmark
| | - Karen L Feilberg
- Department of Chemistry and ‡Centre for Oil and Gas, Technical University of Denmark , 2800 Kongens Lyngby, Denmark
| | - Wei Yan
- Department of Chemistry and ‡Centre for Oil and Gas, Technical University of Denmark , 2800 Kongens Lyngby, Denmark
| | - Erling H Stenby
- Department of Chemistry and ‡Centre for Oil and Gas, Technical University of Denmark , 2800 Kongens Lyngby, Denmark
| | - Esben Thormann
- Department of Chemistry and ‡Centre for Oil and Gas, Technical University of Denmark , 2800 Kongens Lyngby, Denmark
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10
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Adsorption of polyelectrolyte-like proteins to silica surfaces and the impact of pH on the response to ionic strength. A Monte Carlo simulation and ellipsometry study. J Colloid Interface Sci 2017; 494:266-273. [DOI: 10.1016/j.jcis.2017.01.087] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Revised: 01/18/2017] [Accepted: 01/19/2017] [Indexed: 11/17/2022]
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11
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Nylander T, Soltwedel O, Ganeva M, Hirst C, Holdaway J, Arteta MY, Wadsäter M, Barauskas J, Frielinghaus H, Holderer O. Relationship between Structure and Fluctuations of Lipid Nonlamellar Phases Deposited at the Solid-Liquid Interface. J Phys Chem B 2017; 121:2705-2711. [PMID: 28266854 DOI: 10.1021/acs.jpcb.6b11038] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The structure and dynamics of nanostructure films formed by mixtures of soy phosphatidylcholine and glycerol dioleate at the silicon-aqueous interface were studied by grazing incidence neutron spin echo spectroscopy (GINSES), specular and off-specular neutron reflectometry, and small-angle X-ray diffraction. Reverse hexagonal (HII) and micellar cubic phase (Fd3m) layers at the solid-liquid interface have been identified with neutron reflectometry measurements. A preferred orientation of the liquid crystalline (LC) domains was observed only for the anisotropic HII phase. The size of the LC domains was found to be about 1 micrometer as estimated from the width of the diffraction peaks. GINSES revealed that the cubic phase forms rather rigid films. In comparison, the HII film was more flexible, appearing as a modified undulation spectrum of the cylinders due to the interaction with the substrate.
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Affiliation(s)
- Tommy Nylander
- Physical Chemistry, Department of Chemistry, Lund University , P.O. Box 124, SE-22100 Lund, Sweden.,NanoLund, Lund University , P.O. Box 118, SE-22100 Lund, Sweden
| | - Olaf Soltwedel
- Max-Planck-Institute for Solid State Research, Outstation at MLZ , Lichtenbergstr. 1, 85747 Garching, Germany.,Technical University of Munich , Lichtenbergstr. 1, 85747 Garching, Germany
| | - Marina Ganeva
- Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz-Zentrum (MLZ), Forschungszentrum Jülich GmbH , Lichtenbergstr. 1, 85747 Garching, Germany
| | - Christopher Hirst
- Physical Chemistry, Department of Chemistry, Lund University , P.O. Box 124, SE-22100 Lund, Sweden
| | - James Holdaway
- Physical Chemistry, Department of Chemistry, Lund University , P.O. Box 124, SE-22100 Lund, Sweden
| | - Marianna Yanez Arteta
- Physical Chemistry, Department of Chemistry, Lund University , P.O. Box 124, SE-22100 Lund, Sweden
| | - Maria Wadsäter
- Physical Chemistry, Department of Chemistry, Lund University , P.O. Box 124, SE-22100 Lund, Sweden.,Camurus AB , Ideon Science Park, Gamma Building, Sölvegatan 41, SE-22379 Lund, Sweden
| | - Justas Barauskas
- Camurus AB , Ideon Science Park, Gamma Building, Sölvegatan 41, SE-22379 Lund, Sweden.,Biomedical Science, Faculty of Health and Society, Malmö University , SE-20506 Malmö, Sweden
| | - Henrich Frielinghaus
- Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz-Zentrum (MLZ), Forschungszentrum Jülich GmbH , Lichtenbergstr. 1, 85747 Garching, Germany
| | - Olaf Holderer
- Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz-Zentrum (MLZ), Forschungszentrum Jülich GmbH , Lichtenbergstr. 1, 85747 Garching, Germany
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12
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Ferhan AR, Jackman JA, Cho NJ. Integration of Quartz Crystal Microbalance-Dissipation and Reflection-Mode Localized Surface Plasmon Resonance Sensors for Biomacromolecular Interaction Analysis. Anal Chem 2016; 88:12524-12531. [DOI: 10.1021/acs.analchem.6b04303] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Abdul Rahim Ferhan
- School
of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798
| | - Joshua A. Jackman
- School
of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798
| | - Nam-Joon Cho
- School
of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798
- School
of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459
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13
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Zhu PW, Chen L. Synergistic Effects of Bound Micelles and Temperature on the Flexibility of Thermoresponsive Polymer Brushes. J Phys Chem B 2016; 120:11595-11606. [PMID: 27750008 DOI: 10.1021/acs.jpcb.6b08696] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The persistence length is a key parameter for the quantitative interpretation of the flexibility of polymers. We have studied complexes composed of a spherical poly(N-isopropylacrylamide) (PNIPAM) brush and a sodium dodecyl sulfate micelle in an effort to characterize the flexibility of tethered PNIPAM below the lower critical solution temperature TLCST. An analytical mean-field model is used to describe the persistence length Lp in a broad range of ψ, the number of bound micelles per chain. The persistence length of micelle-constrained PNIPAM is quantitatively correlated with the thermal energy kBT, electrostatic repulsion fC, and effective excluded-volume parameter νeff. The persistence length per ψ, which depends on T and fC, is found to scale with a synergistic effect fC/(ψkBT). The results reveal that the bound-micelle charges affecting the persistence length are analogous to the fixed charges of polyelectrolytes, though the bound micelles are separated by a large number of neutral monomers. The extension ⟨L⟩ of micelle-constrained PNIPAM decreases as ⟨L⟩ ∼ fC-βF with fC, where βF ≈ 0.58-0.8 depending on ψ, but as the universal power law ⟨L⟩ ∼ (fC/kBT)-0.6 with the synergistic effect fC/(kBT), irrespective of ψ. In spite of the intricate interplay among the multiple components in the system, the extension scales as a function of νeff as ⟨L⟩ ∼ (νeff/ψLp)-βV, where βV ≈ 0.35 for the significant monomer interaction and βV ≈ 0.2 for the weak or negligible monomer interaction.
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Affiliation(s)
- Peng-Wei Zhu
- Department of Materials Science and Engineering and ‡Department of Chemical Engineering, Monash University , Clayton, VIC 3800, Australia
| | - Luguang Chen
- Department of Materials Science and Engineering and ‡Department of Chemical Engineering, Monash University , Clayton, VIC 3800, Australia
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14
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Heydari G, Tyrode E, Visnevskij C, Makuska R, Claesson PM. Temperature-Dependent Deicing Properties of Electrostatically Anchored Branched Brush Layers of Poly(ethylene oxide). LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:4194-4202. [PMID: 27064661 DOI: 10.1021/acs.langmuir.6b00671] [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 hydration water of hydrophilic polymers freezes at subzero temperatures. The adsorption of such polymers will result in a hydrophilic surface layer that strongly binds water. Provided this interfacial hydration water remains liquidlike at subzero temperatures, its presence could possibly reduce ice adhesion, in particular, if the liquidlike layer is thicker than or comparable to the surface roughness. To explore this idea, a diblock copolymer, having one branched bottle-brush block of poly(ethylene oxide) and one linear cationic block, was electrostatically anchored on flat silica surfaces. The shear ice adhesion strength on such polymer-coated surfaces was investigated down to -25 °C using a homebuilt device. In addition, the temperature dependence of the ice adhesion on surfaces coated with only the cationic block, only the branched bottle-brush block, and with linear poly(ethylene oxide) was investigated. Significant ice adhesion reduction, in particular, at temperatures above -15 °C, was observed on silica surfaces coated with the electrostatically anchored diblock copolymer. Differential scanning calorimetry measurements on bulk polymer solutions demonstrate different thermal transitions of water interacting with branched and linear poly(ethylene oxide) (with hydration water melting points of about -18 and -10 °C, respectively). This difference is consistent with the low shear ice adhesion strength measured on surfaces carrying branched bottle-brush structured poly(ethylene oxide) at -10 °C, whereas no significant adhesion reduction was obtained with linear poly(ethylene oxide) at this temperature. We propose a lubrication effect of the hydration water bound to the branched bottle-brush structured poly(ethylene oxide), which, in the bulk, does not freeze until -18 °C.
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Affiliation(s)
- Golrokh Heydari
- Department of Chemistry, Surface and Corrosion Science, School of Chemical Science and Engineering, KTH Royal Institute of Technology , Drottning Kristinas väg 51, SE-100 44 Stockholm, Sweden
| | - Eric Tyrode
- Department of Chemistry, Surface and Corrosion Science, School of Chemical Science and Engineering, KTH Royal Institute of Technology , Drottning Kristinas väg 51, SE-100 44 Stockholm, Sweden
| | - Ceslav Visnevskij
- Department of Polymer Chemistry, Vilnius University , Naugarduko 24, LT-03225 Vilnius, Lithuania
| | - Ricardas Makuska
- Department of Polymer Chemistry, Vilnius University , Naugarduko 24, LT-03225 Vilnius, Lithuania
| | - Per M Claesson
- Department of Chemistry, Surface and Corrosion Science, School of Chemical Science and Engineering, KTH Royal Institute of Technology , Drottning Kristinas väg 51, SE-100 44 Stockholm, Sweden
- Chemistry, Materials and Surfaces, SP Technical Research Institute of Sweden , Box 5607, SE-114 86 Stockholm, Sweden
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15
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Riley JK, An J, Tilton RD. Ionic Surfactant Binding to pH-Responsive Polyelectrolyte Brush-Grafted Nanoparticles in Suspension and on Charged Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:13680-13689. [PMID: 26649483 DOI: 10.1021/acs.langmuir.5b03757] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The interactions between silica nanoparticles grafted with a brush of cationic poly(2-(dimethylamino) ethyl methacrylate) (SiO2-g-PDMAEMA) and anionic surfactant sodium dodecyl sulfate (SDS) is investigated by dynamic light scattering, electrophoretic mobility, quartz crystal microbalance with dissipation, ellipsometry, and atomic force microscopy. SiO2-g-PDMAEMA exhibits pH-dependent charge and size properties which enable the SDS binding to be probed over a range of electrostatic conditions and brush conformations. SDS monomers bind irreversibly to SiO2-g-PDMAEMA at low surfactant concentrations (∼10(-4) M) while exhibiting a pH-dependent threshold above which cooperative, partially reversible SDS binding occurs. At pH 5, SDS binding induces collapse of the highly charged and swollen brush as observed in the bulk by DLS and on surfaces by QCM-D. Similar experiments at pH 9 suggest that SDS binds to the periphery of the weakly charged and deswollen brush and produces SiO2-g-PDMAEMA/SDS complexes with a net negative charge. SiO2-g-PDMAEMA brush collapse and charge neutralization is further confirmed by colloidal probe AFM measurements, where reduced electrosteric repulsions and bridging adhesion are attributed to effects of the bound SDS. Additionally, sequential adsorption schemes with SDS and SiO2-g-PDMAEMA are used to enhance deposition relative to SiO2-g-PDMAEMA direct adsorption on silica. This work shows that the polyelectrolyte brush configuration responds in a more dramatic fashion to SDS than to pH-induced changes in ionization, and this can be exploited to manipulate the structure of adsorbed layers and the corresponding forces of compression and friction between opposing surfaces.
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Affiliation(s)
| | - Junxue An
- KTH Royal Institute of Technology , School of Chemical Science and Engineering, Department of Chemistry, Surface and Corrosion Science, Stockholm SE-100 44, Sweden
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16
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Wang H, Alfredsson V, Tropsch J, Ettl R, Nylander T. Effect of Polyelectrolyte and Fatty Acid Soap on the Formation of CaCO3 in the Bulk and the Deposit on Hard Surfaces. ACS APPLIED MATERIALS & INTERFACES 2015; 7:21115-21129. [PMID: 26353982 DOI: 10.1021/acsami.5b04679] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The effects of sodium polyacrylate (NaPAA) as well as potassium oleate on the nucleation and calcium carbonate crystal growth on hard surfaces, i.e., stainless steel and silica, have been investigated at different temperatures. The relation between the surface deposition and the corresponding bulk processes has been revealed by combining dynamic light scattering (DLS), scanning electron microscopy (SEM), X-ray diffraction (XRD), and ellipsometry. The aim was to further our understanding of the crystal deposition/growth mechanism and how it can be controlled by the presence of polyelectrolytes (NaPAA) or soap (potassium oleate). The addition of polyelectrolytes (NaPAA) or soap (potassium oleate) decreases the size of CaCO3 particles in bulk solution and affects both crystal structure and morphology in the bulk as well as on hard surfaces. The amount of particles on hard surfaces decreases significantly in the presence of both potassium oleate and NaPAA. This was found to be a consequence of potassium oleate or NaPAA adsorption on the hard surface as well as on the CaCO3 crystal surfaces. Here, the polymer NaPAA exhibited a stronger inhibition effect on the formation and growth of CaCO3 particles than potassium oleate.
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Affiliation(s)
- Hao Wang
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences , Taiyuan, Shanxi 030001, People's Republic of China
- Physical Chemistry, Department of Chemistry, Lund University , PO Box 124, SE-221 00 Lund, Sweden
| | - Viveka Alfredsson
- Physical Chemistry, Department of Chemistry, Lund University , PO Box 124, SE-221 00 Lund, Sweden
| | | | | | - Tommy Nylander
- Physical Chemistry, Department of Chemistry, Lund University , PO Box 124, SE-221 00 Lund, Sweden
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17
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An J, Liu X, Linse P, Dėdinaitė A, Winnik FM, Claesson PM. Tethered poly(2-isopropyl-2-oxazoline) chains: temperature effects on layer structure and interactions probed by AFM experiments and modeling. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:3039-3048. [PMID: 25686020 DOI: 10.1021/la504653w] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Thermoresponsive polymer layers on silica surfaces have been obtained by utilizing electrostatically driven adsorption of a cationic-nonionic diblock copolymer. The cationic block provides strong anchoring to the surface for the nonionic block of poly(2-isopropyl-2-oxazoline), referred to as PIPOZ. The PIPOZ chain interacts favorably with water at low temperatures, but above 46 °C aqueous solutions of PIPOZ phase separate as water becomes a poor solvent for the polymer. We explore how a change in solvent condition affects interactions between such adsorbed layers and report temperature effects on both normal forces and friction forces. To gain further insight, we utilize self-consistent lattice mean-field theory to follow how changes in temperature affect the polymer segment density distributions and to calculate surface force curves. We find that with worsening of the solvent condition an attraction develops between the adsorbed PIPOZ layers, and this observation is in good agreement with predictions of the mean-field theory. The modeling also demonstrates that the segment density profile and the degree of chain interpenetration under a given load between two PIPOZ-coated surfaces rise significantly with increasing temperature.
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Affiliation(s)
- Junxue An
- †School of Chemical Science and Engineering, Department of Chemistry, Division of Surface and Corrosion Science, KTH Royal Institute of Technology, Drottning Kristinas väg 51, SE-100 44 Stockholm, Sweden
| | - Xiaoyan Liu
- †School of Chemical Science and Engineering, Department of Chemistry, Division of Surface and Corrosion Science, KTH Royal Institute of Technology, Drottning Kristinas väg 51, SE-100 44 Stockholm, Sweden
| | - Per Linse
- ‡Physical Chemistry, Department of Chemistry, Lund University, Box 124, SE-221 00 Lund, Sweden
| | - Andra Dėdinaitė
- †School of Chemical Science and Engineering, Department of Chemistry, Division of Surface and Corrosion Science, KTH Royal Institute of Technology, Drottning Kristinas väg 51, SE-100 44 Stockholm, Sweden
- §Chemistry, Materials and Surfaces, SP Technical Research Institute of Sweden, Box 5607, SE-114 86 Stockholm, Sweden
| | - Françoise M Winnik
- ∥Department of Chemistry and Faculty of Pharmacy, University of Montreal, CP 6128 Succursale Centre Ville, Montreal, QC H3C 3J7, Canada
- ⊥National Institute for Materials Science, WPI International Center for Materials Nanoarchitectonics (MANA), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Per M Claesson
- †School of Chemical Science and Engineering, Department of Chemistry, Division of Surface and Corrosion Science, KTH Royal Institute of Technology, Drottning Kristinas väg 51, SE-100 44 Stockholm, Sweden
- §Chemistry, Materials and Surfaces, SP Technical Research Institute of Sweden, Box 5607, SE-114 86 Stockholm, Sweden
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