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Synthesis of Ni Doped Iron Oxide Colloidal Nanocrystal Clusters using Poly(N-isopropylacrylamide) templates for efficient recovery of cefixime and methylene blue. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129616] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Jana S, Uchman M. Poly(2-oxazoline)-based stimulus-responsive (Co)polymers: An overview of their design, solution properties, surface-chemistries and applications. Prog Polym Sci 2020. [DOI: 10.1016/j.progpolymsci.2020.101252] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Pooch F, Sliepen M, Knudsen KD, Nyström B, Tenhu H, Winnik FM. Poly(2-isopropyl-2-oxazoline)- b-poly(lactide) (PiPOx- b-PLA) Nanoparticles in Water: Interblock van der Waals Attraction Opposes Amphiphilic Phase Separation. Macromolecules 2019; 52:1317-1326. [PMID: 31496543 PMCID: PMC6727592 DOI: 10.1021/acs.macromol.8b02558] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Revised: 01/16/2019] [Indexed: 12/17/2022]
Abstract
Poly(2-isopropyl-2-oxazoline)-b-poly(lactide) (PiPOx-b-PLA) diblock copolymers comprise two miscible blocks: the hydrophilic and thermosensitive PiPOx and the hydrophobic PLA, a biocompatible and biodegradable polyester. They self-assemble in water, forming stable dispersions of nanoparticles with hydrodynamic radii (R h) ranging from ∼18 to 60 nm, depending on their molar mass, the relative size of the two blocks, and the configuration of the lactide unit. Evidence from 1H nuclear magnetic resonance spectroscopy, light scattering, small-angle neutron scattering, and cryo-transmission electron microscopy indicates that the nanoparticles do not adopt the typical core-shell morphology. Aqueous nanoparticle dispersions heated from 20 to 80 °C were monitored by turbidimetry and microcalorimetry. Nanoparticles of copolymers containing a poly(dl-lactide) block coagulated irreversibly upon heating to 50 °C, forming particles of various shapes (R h ∼ 200-500 nm). Dispersions of PiPOx-b-poly(l-lactide) coagulated to a lesser extent or remained stable upon heating. From the entire experimental evidence, we conclude that PiPOx-b-PLA nanoparticles consist of a core of PLA/PiPOx chains associated via dipole-dipole interactions of the PLA and PiPOx carbonyl groups. The core is surrounded by tethered PiPOx loops and tails responsible for the colloidal stability of the nanoparticles in water. While the core of all nanoparticles studied contains associated PiPOx and PLA blocks, fine details of the nanoparticles morphology vary predictably with the size and composition of the copolymers, yielding particles of distinctive thermosensitivity in aqueous dispersions.
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Affiliation(s)
- Fabian Pooch
- Department
of Chemistry, University of Helsinki, P.O. Box 55, Helsinki 00014, Finland
| | - Marjolein Sliepen
- Department
of Chemistry, University of Helsinki, P.O. Box 55, Helsinki 00014, Finland
| | - Kenneth D. Knudsen
- Department
of Physics, Institute for Energy Technology, P.O. Box 40, N-2027 Kjeller, Norway
| | - Bo Nyström
- Department
of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
| | - Heikki Tenhu
- Department
of Chemistry, University of Helsinki, P.O. Box 55, Helsinki 00014, Finland
| | - Françoise M. Winnik
- Department
of Chemistry, University of Helsinki, P.O. Box 55, Helsinki 00014, Finland
- International
Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
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Dobryden I, Cortes Ruiz M, Zhang X, Dėdinaitė A, Wieland DCF, Winnik FM, Claesson PM. Thermoresponsive Pentablock Copolymer on Silica: Temperature Effects on Adsorption, Surface Forces, and Friction. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:653-661. [PMID: 30605339 DOI: 10.1021/acs.langmuir.8b03729] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The adsorption of hydrophilic or amphiphilic multiblock copolymers provides a powerful means to produce well-defined "smart" surfaces, especially if one or several blocks are sensitive to external stimuli. We focus here on an A-B-A-B-A copolymer, where A is a cationic poly((3-acrylamido-propyl)-trimethylammonium chloride) (PAMPTMA) block containing 15 (end blocks) or 30 (middle block) repeat units and B is a neutral thermosensitive water-soluble poly(2-isopropyl-2-oxazoline) (PIPOZ) block with 50 repeat units. X-ray reflectivity and quartz crystal microbalance with dissipation monitoring were employed to study the adsorption of PAMPTMA15-PIPOZ50-PAMPTMA30-PIPOZ50-PAMPTMA15 on silica surfaces. The latter technique was employed at different temperatures up to 50 °C. Surface forces and friction between the two silica surfaces across aqueous pentablock copolymer solutions at different temperatures were determined with the atomic force microscopy colloidal probe force and friction measurements. The cationic pentablock copolymer was found to have a high affinity to the negatively charged silica surface, leading to a thin (2 nm) and rigid adsorbed layer. A steric force was encountered at a separation of around 3 nm from hard wall contact. A capillary condensation of a polymer-rich phase was observed at the cloud point of the solution. The friction forces were evaluated using Amontons' rule modified with an adhesion term.
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Affiliation(s)
- Illia Dobryden
- School of Engineering Sciences in Chemistry, Biotechnology and Health, Department of Chemistry, Division of Surface and Corrosion Science , KTH Royal Institute of Technology , SE-10044 Stockholm , Sweden
| | - Maria Cortes Ruiz
- Department of Chemical Engineering , Grove School of Engineering, the City College of New York , New York , New York 10031 , United States
| | - Xuwei Zhang
- Department of Chemistry , University of Montreal , CP 6128 Succursale Centre Ville , Montreal , Québec H3C3 J7 , Canada
| | - Andra Dėdinaitė
- School of Engineering Sciences in Chemistry, Biotechnology and Health, Department of Chemistry, Division of Surface and Corrosion Science , KTH Royal Institute of Technology , SE-10044 Stockholm , Sweden
- Division of Bioscience and Materials , RISE Research Institutes of Sweden , SE-114 86 Stockholm , Sweden
| | - D C Florian Wieland
- Helmholtz Zentrum Geesthacht, Institute for Materials Research , Max-Planck Straße 1 , 21502 Geesthacht , Germany
| | - Françoise M Winnik
- Department of Chemistry , University of Helsinki , P.O. Box 55, Helsinki FI00014 , Finland
- International Center for Materials Nanoarchitectonics (MANA) , National Institute for Materials Science (NIMS) , 1-1 Namiki , Tsukuba 305-0044 , Japan
| | - Per M Claesson
- School of Engineering Sciences in Chemistry, Biotechnology and Health, Department of Chemistry, Division of Surface and Corrosion Science , KTH Royal Institute of Technology , SE-10044 Stockholm , Sweden
- Division of Bioscience and Materials , RISE Research Institutes of Sweden , SE-114 86 Stockholm , Sweden
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Lorson T, Lübtow MM, Wegener E, Haider MS, Borova S, Nahm D, Jordan R, Sokolski-Papkov M, Kabanov AV, Luxenhofer R. Poly(2-oxazoline)s based biomaterials: A comprehensive and critical update. Biomaterials 2018; 178:204-280. [DOI: 10.1016/j.biomaterials.2018.05.022] [Citation(s) in RCA: 204] [Impact Index Per Article: 34.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Revised: 05/11/2018] [Accepted: 05/14/2018] [Indexed: 02/06/2023]
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Zhou Y, Wu P. Block length-dependent phase transition of poly(N-isopropylacrylamide)-b-poly(2-isopropyl-2-oxazoline) diblock copolymer in water. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.08.027] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Murdoch TJ, Humphreys BA, Johnson EC, Webber GB, Wanless EJ. Specific ion effects on thermoresponsive polymer brushes: Comparison to other architectures. J Colloid Interface Sci 2018; 526:429-450. [DOI: 10.1016/j.jcis.2018.04.086] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Revised: 04/20/2018] [Accepted: 04/23/2018] [Indexed: 02/06/2023]
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Zajforoushan Moghaddam S, Zhu K, Nyström B, Thormann E. Thermo-responsive diblock and triblock cationic copolymers at the silica/aqueous interface: A QCM-D and AFM study. J Colloid Interface Sci 2017. [DOI: 10.1016/j.jcis.2017.06.044] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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An J, Liu X, Dedinaite A, Korchagina E, Winnik FM, Claesson PM. Effect of solvent quality and chain density on normal and frictional forces between electrostatically anchored thermoresponsive diblock copolymer layers. J Colloid Interface Sci 2017; 487:88-96. [DOI: 10.1016/j.jcis.2016.10.021] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2016] [Revised: 10/10/2016] [Accepted: 10/11/2016] [Indexed: 11/16/2022]
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Abstract
Recent advances in thermoresponsive poly(2-oxazoline)s, polypeptoids, and polypeptides, with a specific focus on structure–property relationships, self-assembly, and applications, are reviewed.
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Affiliation(s)
- Richard Hoogenboom
- Supramolecular Chemistry Group
- Department of Organic and Macromolecular Chemistry
- Ghent University
- B-9000 Ghent
- Belgium
| | - Helmut Schlaad
- Institute of Chemistry
- University of Potsdam
- 14476 Potsdam
- Germany
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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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