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Chen XZ, Niu D, Gao HT, Du M. Deswelling Mechanisms of PNIPAM Grafted in Nanochannels: A Molecular Dynamics Simulation Study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:7692-7700. [PMID: 38546150 DOI: 10.1021/acs.langmuir.4c00381] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/10/2024]
Abstract
Porous thermosensitive hydrogels exhibit a more flexible strategy for freshwater capture compared to conventional hydrogels. This study employs molecular dynamics (MD) simulation to investigate the deswelling behavior of poly(N-isopropylacrylamide) (PNIPAM) grafted within the nanochannel, aiming to elucidate the deswelling elimination process at various temperatures. Notably, a distinct phase separation is observed at specific temperatures above the lower solution temperature (LCST). Furthermore, this study takes the effect of heat flux into account, wherein distinct heat fluxes lead to varying levels of phase separation between water and the polymer. Specifically, the number of hydrogen bonds, volume of polymer chains, and density distribution of water molecules are statistically analyzed to reveal the mechanism of phase separation in a thermosensitive hydrogel. These findings provide insight into the accelerated deswelling kinetics of the PNIPAM polymer chain, which has guiding significance for the field of water harvesting by the enhancement of the water release capacity in thermosensitive hydrogels.
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Affiliation(s)
- Xian-Zhi Chen
- Institute of Refrigeration & Cryogenics Engineering, Dalian Maritime University, Dalian 116026, P. R. China
| | - Dong Niu
- Institute of Refrigeration & Cryogenics Engineering, Dalian Maritime University, Dalian 116026, P. R. China
| | - Hong-Tao Gao
- Institute of Refrigeration & Cryogenics Engineering, Dalian Maritime University, Dalian 116026, P. R. China
| | - Mu Du
- Institute for Advanced Technology, Shandong University, Jinan, Shandong 250061, P. R. China
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2
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Al-Jumaily AM, Grau-Bartual S, Weerasinghe NT. Biocompatible Polymer for Self-Humidification. Polymers (Basel) 2023; 15:4101. [PMID: 37896345 PMCID: PMC10611040 DOI: 10.3390/polym15204101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2023] [Revised: 10/12/2023] [Accepted: 10/13/2023] [Indexed: 10/29/2023] Open
Abstract
Lung supportive devices (LSDs) have been extensively utilized in treating patients diagnosed with various respiratory disorders. However, these devices can cause moisture depletion in the upper airway by interfering with the natural lubrication and air conditioning process. To remedy this, current technologies implement heated humidification processes, which are bulky, costly, and nonfriendly. However, it has been demonstrated that in a breath cycle, the amount of water vapor in the exhaled air is of a similar quantity to the amount needed to humidify the inhaled air. This research proposes to trap the moisture from exhaled air and reuse it during inhalation by developing a state-of-the-art hydrophilic/hydrophobic polymer tuned to deliver this purpose. Using the atom transfer radical polymerization (ATRP) method, a substrate was successfully created by incorporating poly (N-isopropyl acrylamide) (PNIPAM) onto cotton. The fabricated material exhibited a water vapor release rate of 24.2 ± 1.054%/min at 32 °C, indicating its ability to humidify the inhaled air effectively. These findings highlight the potential of the developed material as a promising solution for applications requiring rapid moisture recovery.
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Affiliation(s)
- Ahmed M. Al-Jumaily
- AUT—Institute of Biomedical Technologies, Auckland University of Technology, Auckland 1010, New Zealand
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3
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Huang Y, Morozova SM, Li T, Li S, Naguib HE, Kumacheva E. Stimulus-Responsive Transport Properties of Nanocolloidal Hydrogels. Biomacromolecules 2023; 24:1173-1183. [PMID: 36580573 DOI: 10.1021/acs.biomac.2c01222] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Applications of polymer hydrogels in separation technologies, environmental remediation, and drug delivery require control of hydrogel transport properties that are largely governed by the pore dimensions. Stimulus-responsive change in pore size offers the capability to change gel's transport properties "on demand". Here, we report a nanocolloidal hydrogel that exhibits temperature-controlled increase in pore size and, as a result, enhanced transport of encapsulated species from the gel. The hydrogel was formed by the covalent cross-linking of aldehyde-modified cellulose nanocrystals and chitosan carrying end-grafted poly(N-isopropylacrylamide) (pNIPAm) molecules. Owing to the temperature-mediated coil-to-globule transition of pNIPAm grafts, they acted as a temperature-responsive "gate" in the hydrogel. At elevated temperature, the size of the pores showed up to a 4-fold increase, with no significant changes in volume, in contrast with conventional pNIPAm-derived gels exhibiting a reduction in both pore size and volume in similar conditions. Temperature-mediated transport properties of the gel were explored by studying diffusion of nanoparticles with different dimensions from the gel, leading to the established correlation between the kinetics of diffusion-governed nanoparticle release and the ratio nanoparticle dimensions-to-pore size. The proposed approach to stimulus-responsive control of hydrogel transport properties has many applications, including their use in nanomedicine and tissue engineering.
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Affiliation(s)
- Yuhang Huang
- Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, Toronto, OntarioM5S 3E5, Canada
| | - Sofia M Morozova
- Department of Chemistry, University of Toronto, 80 Saint George Street, Toronto, OntarioM5S 3H6, Canada
- N.E. Bauman Moscow State Technical University, 5/1 Second Baumanskaya Street, Moscow105005, Russian Federation
| | - Terek Li
- Department of Materials Science and Engineering, University of Toronto, 184 College Street, Toronto, OntarioM5S 3E4, Canada
| | - Shangyu Li
- Department of Chemistry, University of Toronto, 80 Saint George Street, Toronto, OntarioM5S 3H6, Canada
| | - Hani E Naguib
- Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, Toronto, OntarioM5S 3E5, Canada
- Department of Materials Science and Engineering, University of Toronto, 184 College Street, Toronto, OntarioM5S 3E4, Canada
- Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, OntarioM5S 3G8, Canada
- Institute of Biomedical Engineering, University of Toronto, 4 Taddle Creek Road, Toronto, OntarioM5S 3G9, Canada
| | - Eugenia Kumacheva
- Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, Toronto, OntarioM5S 3E5, Canada
- Department of Chemistry, University of Toronto, 80 Saint George Street, Toronto, OntarioM5S 3H6, Canada
- Institute of Biomedical Engineering, University of Toronto, 4 Taddle Creek Road, Toronto, OntarioM5S 3G9, Canada
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4
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Temperature–regulated non-monotonic behavior of DNA immobilization on poly(N–isopropylacrylamide) (PNIPAm)–grafted surface. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.128507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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5
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Yang J, Fan H, Zhou Y, Liang H, Zeng L, Xie D, Guo T. Construction of waterborne superhydrophobic coatings with controlled water‐droplet adhesion. J Appl Polym Sci 2022. [DOI: 10.1002/app.51482] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Jixiang Yang
- Key Laboratory of Functional Polymer Materials, Ministry of Education, Institute of Polymer Chemistry, College of Chemistry Nankai University Tianjin China
| | - Haoyu Fan
- Key Laboratory of Functional Polymer Materials, Ministry of Education, Institute of Polymer Chemistry, College of Chemistry Nankai University Tianjin China
| | - Yuqian Zhou
- Key Laboratory of Functional Polymer Materials, Ministry of Education, Institute of Polymer Chemistry, College of Chemistry Nankai University Tianjin China
| | - Huiyun Liang
- Key Laboratory of Functional Polymer Materials, Ministry of Education, Institute of Polymer Chemistry, College of Chemistry Nankai University Tianjin China
| | - Liheng Zeng
- Key Laboratory of Functional Polymer Materials, Ministry of Education, Institute of Polymer Chemistry, College of Chemistry Nankai University Tianjin China
| | - Dong Xie
- Key Laboratory of Functional Polymer Materials, Ministry of Education, Institute of Polymer Chemistry, College of Chemistry Nankai University Tianjin China
| | - Tianying Guo
- Key Laboratory of Functional Polymer Materials, Ministry of Education, Institute of Polymer Chemistry, College of Chemistry Nankai University Tianjin China
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Stöbener DD, Weinhart M. On the foundation of thermal "Switching": The culture substrate governs the phase transition mechanism of thermoresponsive brushes and their performance in cell sheet fabrication. Acta Biomater 2021; 136:243-253. [PMID: 34530139 DOI: 10.1016/j.actbio.2021.09.012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Revised: 08/23/2021] [Accepted: 09/08/2021] [Indexed: 12/11/2022]
Abstract
Thermally "switchable" poly(glycidyl ether) (PGE) brushes constitute effective coatings for the temperature-triggered harvest of confluent cell sheets. Based on a simple "grafting-to" approach, such coatings can be tethered to various applied plastic culture substrate materials. Herein, we elucidate the self-assembly of PGE brushes with tunable grafting densities up to 0.12 and 0.22 chains nm-2 on polystyrene (PS) and tissue culture PS (TCPS), respectively. In terms of temperature-dependent wettability and protein adsorption, we found that brushes exhibit distinct grafting density-dependent properties which correlate with their cell sheet fabrication performance. In addition, temperature-ramped quartz-crystal microbalance with dissipation (QCM-D) measurements revealed marked substrate-specific PGE phase transitions which allowed us to deduce comprehensive switching mechanisms. Thus, we demonstrate that brushes tethered to hydrophilic TCPS (contact angle (CA) ∼ 60°) undergo a "cushioned" transition comprising a non-switchable, hydrated basal layer as well as a switchable top layer which regulates cell sheet detachment. In contrast, PGE brushes tethered to PS undergo a "grounded" transition which is substantially influenced by the dehydrating effect of the less hydrophilic PS substrate (CA ∼ 90°). These divergent phase transition mechanisms give rise to a broad scope in cell sheet fabrication performance, yielding staggered detachment times within a 30 min to 3 h range. Hence, we emphasize the importance of a detailed knowledge on the effect of applied culture substrates on the thermal switchability and phase transition characteristics of thermoresponsive brush coatings to accomplish an optimized design for functional cell culture dishes. STATEMENT OF SIGNIFICANCE: As the first comparative study of its kind, we elucidate the substrate-dependent thermal switchability of thermoresponsive brush coatings and evaluate their grafting density-dependent phase transition mechanism and its effect on cell sheet fabrication performance.
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7
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Mora-Sierra Z, Gopan G, Chang R, Leckband DE, Gruebele M. Stabilization and Kinetics of an Adsorbed Protein Depends on the Poly( N-isopropylacrylamide) Grafting Density. Biomacromolecules 2021; 22:4470-4478. [PMID: 34606244 DOI: 10.1021/acs.biomac.1c00417] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The solubility transition at the lower critical solution temperature (LCST, 32 °C) of poly(N-isopropylacrylamide) (PNIPAM) is widely used as a thermal switch to rapidly and reversibly capture and release proteins and cells. It is generally assumed that proteins adsorbed to PNIPAM above the LCST are unaffected by polymer interactions. Here we show that the folding stability of the enzyme phosphoglycerate kinase (PGK) is increased by interactions with end-grafted PNIPAM films above the LCST. We systematically compare two protein mutants with different stabilities. The stabilization mirrors the degree of protein adsorption under grafting conditions studied previously. Maximum stabilization occurs when proteins adsorb to low density, collapsed polymer "mushrooms". In the denser polymer "brush" regime, protein stabilization decreases back to a value indistinguishable from the bulk solution, consistent with low protein adsorption on dense, collapsed brushes. The temperature-dependent kinetics measured by Fast Relaxation Imaging reveals that PNIPAM does not affect the overall folding/unfolding mechanism. Based on the different stabilizations of two mutants and the relaxation kinetics, we hypothesize that the polymer acts mainly by increasing the conformational entropy of the folded protein by interacting with the protein surface and less by crowding the unfolded state of PGK.
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8
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Flemming P, Münch AS, Fery A, Uhlmann P. Constrained thermoresponsive polymers - new insights into fundamentals and applications. Beilstein J Org Chem 2021; 17:2123-2163. [PMID: 34476018 PMCID: PMC8381851 DOI: 10.3762/bjoc.17.138] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Accepted: 08/10/2021] [Indexed: 12/15/2022] Open
Abstract
In the last decades, numerous stimuli-responsive polymers have been developed and investigated regarding their switching properties. In particular, thermoresponsive polymers, which form a miscibility gap with the ambient solvent with a lower or upper critical demixing point depending on the temperature, have been intensively studied in solution. For the application of such polymers in novel sensors, drug delivery systems or as multifunctional coatings, they typically have to be transferred into specific arrangements, such as micelles, polymer films or grafted nanoparticles. However, it turns out that the thermodynamic concept for the phase transition of free polymer chains fails, when thermoresponsive polymers are assembled into such sterically confined architectures. Whereas many published studies focus on synthetic aspects as well as individual applications of thermoresponsive polymers, the underlying structure-property relationships governing the thermoresponse of sterically constrained assemblies, are still poorly understood. Furthermore, the clear majority of publications deals with polymers that exhibit a lower critical solution temperature (LCST) behavior, with PNIPAAM as their main representative. In contrast, for polymer arrangements with an upper critical solution temperature (UCST), there is only limited knowledge about preparation, application and precise physical understanding of the phase transition. This review article provides an overview about the current knowledge of thermoresponsive polymers with limited mobility focusing on UCST behavior and the possibilities for influencing their thermoresponsive switching characteristics. It comprises star polymers, micelles as well as polymer chains grafted to flat substrates and particulate inorganic surfaces. The elaboration of the physicochemical interplay between the architecture of the polymer assembly and the resulting thermoresponsive switching behavior will be in the foreground of this consideration.
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Affiliation(s)
- Patricia Flemming
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, 01069 Dresden, Germany
- Technische Universität Dresden, 01062 Dresden, Germany
| | - Alexander S Münch
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, 01069 Dresden, Germany
| | - Andreas Fery
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, 01069 Dresden, Germany
- Technische Universität Dresden, 01062 Dresden, Germany
| | - Petra Uhlmann
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, 01069 Dresden, Germany
- University of Nebraska-Lincoln, NE 68588, Lincoln, USA
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9
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Qu JB, Tan W, Meng W, Lin YY, Li J, Xi L, Liu J. Thermoresponsive Gigaporous Microspheres Facilitate the Efficient Refolding of Recombinant Nitrilase Inclusion Bodies. ACS OMEGA 2020; 5:17918-17925. [PMID: 32743163 PMCID: PMC7391251 DOI: 10.1021/acsomega.0c00432] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Accepted: 07/07/2020] [Indexed: 06/11/2023]
Abstract
In order to assist the refolding of recombinant nitrilase inclusion bodies, a series of thermoresponsive media were prepared by grafting poly(N-isopropylacrylamide-co-butyl-methacrylate) [P(NIPAM-co-BMA)] brushes onto PS microspheres with various particles and pore sizes via an atom transfer radical polymerization (ATRP) method. The effects of particle sizes, pore sizes, and brush grafting amounts of thermoresponsive microspheres on nitrilase refolding were investigated preliminarily. The results showed that the PS-P(NIPAM-co-BMA) microspheres with the medium particle size (74 μm), gigapore size (320 nm), and high grafting amount (35.6 mg/m2) were the most effective candidates. The final nitrilase activity yield could be up to 84.5% with a high initial protein concentration (1 mg/mL) at 30 °C, which was 52.5% higher than that of a simple dilution refolding method at the initial protein concentration (0.1 mg/mL). After the refolding process, the PS-P(NIPAM-co-BMA) microspheres can be easily separated by self-precipitation, and the activity yield of nitrilase still reached 74.5% after being reused for five batches. These results indicated that the thermoresponsive gigaporous medium was an ideal alternative as an artificial chaperone.
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10
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Wan L, Tan X, Sun T, Sun Y, Luo J, Zhang H. Lubrication and drug release behaviors of mesoporous silica nanoparticles grafted with sulfobetaine-based zwitterionic polymer. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 112:110886. [PMID: 32409044 DOI: 10.1016/j.msec.2020.110886] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Revised: 03/14/2020] [Accepted: 03/20/2020] [Indexed: 12/23/2022]
Abstract
Osteoarthritis, which is characterized by irreversible destruction of articular cartilage and severe inflammation of joint capsule, may be effectively treated via the synergistic therapy of lubrication restoration and local drug intervention. In this study, zwitterionic polymer-grafted mesoporous silica nanoparticles (MSNs@pSBMA) with the property of enhanced lubrication and sustained drug release were successfully synthesized via photopolymerization of 3-[dimethyl-[2-(2-methylprop-2-enoyloxy) ethyl] azaniumyl] propane-1-sulfonate polymer (pSBMA) on the surface of MSNs. The tribiological test showed that the lubrication performance of MSNs@pSBMA was remarkably improved, with a reduction of 80% in friction coefficient compared with MSNs. It was attributed to hydration lubrication mechanism by which a tenacious hydration layer was formed surrounding the N+(CH2)2(CH3)2 and SO3- headgroups in the pSBMA polyelectrolyte polymer. Additionally, the surface morphology analysis of the tribopairs demonstrated that MSNs@pSBMA were endowed with excellent anti-wear performance. Importantly, the drug release test illustrated that, compared with MSNs, MSNs@pSBMA achieved good sustained drug release behavior. In summary, the MSNs@pSBMA nanoparticles developed herein, as an injectable lubricant with enhanced lubrication and drug delivery, may represent a promising approach for the treatment of osteoarthritis.
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Affiliation(s)
- Li Wan
- State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China; College of Mining, Guizhou University, Guiyang 550025, China
| | - Xiaolong Tan
- State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
| | - Tao Sun
- State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
| | - Yulong Sun
- State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
| | - Jing Luo
- Beijing Research Institute of Automation for Machinery Industry Co., Ltd, Beijing 100120, China
| | - Hongyu Zhang
- State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China.
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11
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Thermoresponsive poly(N-isopropylacrylamide) copolymer networks for galantamine hydrobromide delivery. Colloid Polym Sci 2020. [DOI: 10.1007/s00396-020-04621-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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12
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Sudre G, Siband E, Gallas B, Cousin F, Hourdet D, Tran Y. Responsive Adsorption of N-Isopropylacrylamide Based Copolymers on Polymer Brushes. Polymers (Basel) 2020; 12:polym12010153. [PMID: 31936092 PMCID: PMC7022643 DOI: 10.3390/polym12010153] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Revised: 01/01/2020] [Accepted: 01/02/2020] [Indexed: 01/12/2023] Open
Abstract
We investigate the adsorption of pH- or temperature-responsive polymer systems by ellipsometry and neutron reflectivity. To this end, temperature-responsive poly (N-isopropylacrylamide) (PNIPAM) brushes and pH-responsive poly (acrylic acid) (PAA) brushes have been prepared using the "grafting onto" method to investigate the adsorption process of polymers and its reversibility under controlled environment. To that purpose, macromolecular brushes were designed with various chain lengths and a wide range of grafting density. Below the transition temperature (LCST), the characterization of PNIPAM brushes by neutron reflectivity shows that the swelling behavior of brushes is in good agreement with the scaling models before they collapse above the LCST. The reversible adsorption on PNIPAM brushes was carried out with linear copolymers of N-isopropylacrylamide and acrylic acid, P(NIPAM-co-AA). While these copolymers remain fully soluble in water over the whole range of temperature investigated, a quantitative adsorption driven by solvophobic interactions was shown to proceed only above the LCST of the brush and to be totally reversible upon cooling. Similarly, the pH-responsive adsorption driven by electrostatic interactions on PAA brushes was studied with copolymers of NIPAM and N,N-dimethylaminopropylmethacrylamide, P(NIPAM-co-MADAP). In this case, the adsorption of weak polycations was shown to increase with the ionization of the PAA brush with interactions mainly located in the upper part of the brush at pH 7 and more deeply adsorbed within the brush at pH 9.
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Affiliation(s)
- Guillaume Sudre
- Ingénierie des Matériaux Polymères, Université Claude Bernard Lyon 1, Université de Lyon, CNRS UMR 5223, 69100 Villeurbanne, France
- Correspondence: (G.S.); (Y.T.)
| | - Elodie Siband
- Soft Matter Sciences and Engineering, ESPCI Paris, PSL Université, Sorbonne Université, CNRS, 10 rue Vauquelin, F-75005 Paris, France; (E.S.); (D.H.)
| | - Bruno Gallas
- Sorbonne Université, CNRS-UMR 7588, Institut des NanoSciences de Paris, INSP, 4 place Jussieu, F-75005 Paris, France;
| | - Fabrice Cousin
- Laboratoire Léon Brillouin, Université Paris-Saclay, CEA-CNRS, Saclay, 91191 Gif-sur-Yvette CEDEX, France;
| | - Dominique Hourdet
- Soft Matter Sciences and Engineering, ESPCI Paris, PSL Université, Sorbonne Université, CNRS, 10 rue Vauquelin, F-75005 Paris, France; (E.S.); (D.H.)
| | - Yvette Tran
- Soft Matter Sciences and Engineering, ESPCI Paris, PSL Université, Sorbonne Université, CNRS, 10 rue Vauquelin, F-75005 Paris, France; (E.S.); (D.H.)
- Correspondence: (G.S.); (Y.T.)
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13
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Wang G, Raju R, Cho K, Wong S, Prusty BG, Stenzel MH. 3D printed nanocomposites using polymer grafted graphene oxide prepared by multicomponent Passerini reaction. Polym Chem 2020. [DOI: 10.1039/d0py01286f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The surface of commercial graphene oxide was modified with polymers using Passerini reaction, which enhances the compatibility between nanoparticles and 3D printing resin.
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Affiliation(s)
- Guannan Wang
- School of Chemistry
- University of New South Wales
- Sydney
- Australia
| | - Raju Raju
- School of Mechanical and Manufacturing Engineering
- University of New South Wales
- Sydney
- Australia
| | - Kiho Cho
- School of Mechanical and Manufacturing Engineering
- University of New South Wales
- Sydney
- Australia
| | - Sandy Wong
- School of Chemistry
- University of New South Wales
- Sydney
- Australia
| | - B. Gangadhara Prusty
- School of Mechanical and Manufacturing Engineering
- University of New South Wales
- Sydney
- Australia
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14
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Efe-Sanden G, Gallant N, Alcantar N, Toomey R. Adhesion and Particle Removal from Surface-Tethered Poly( N-Isopropylacrylamide) Coatings Using Hydrodynamic Shear Forces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:15751-15758. [PMID: 31656077 DOI: 10.1021/acs.langmuir.9b02625] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Thermally responsive coatings of poly(N-isopropylacrylamide), or poly(NIPAAm), have a volume phase transition temperature (VPTT) near 32 °C. Below this temperature, the coating imbibes water and swells. Above this temperature, the coating rejects water and collapses. Herein, a spinning disk method is used to determine the hydrodynamic shear stress necessary to remove 10 μm polystyrene (PS) microspheres capped with either carboxylic acid (COOH) functionality or immunoglobulin (IgG) proteins from the coatings as a function of coating thickness and temperature. In the case of the PS-COOH, the hydrodynamic shear stress necessary to remove the microspheres was consistently larger below the VPTT than above the VPTT of the poly(NIPAAm) coating. In the case of PS-IgG, the trend was reversed, in which the hydrodynamic shear stress necessary to remove the microspheres was consistently smaller below the VPTT than above the VPTT. Simple scaling relationships were developed to explain the findings within the Johnson-Kendall-Roberts (JKR) model of contact mechanics, which illustrates the delicate interplay between the pull-off force and contact radius (as determined by the coating shear modulus) in governing particle removal from soft surfaces with hydrodynamic forces.
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Affiliation(s)
- Gulnur Efe-Sanden
- Department of Chemical and Biomedical Engineering , University of South Florida , Tampa , Florida 33620 , United States
| | - Nathan Gallant
- Department of Mechanical Engineering , University of South Florida , Tampa , Florida 33620 , United States
| | - Norma Alcantar
- Department of Chemical and Biomedical Engineering , University of South Florida , Tampa , Florida 33620 , United States
| | - Ryan Toomey
- Department of Chemical and Biomedical Engineering , University of South Florida , Tampa , Florida 33620 , United States
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Humphreys BA, Johnson EC, Wanless EJ, Webber GB. Poly( N-isopropylacrylamide) Response to Salt Concentration and Anion Identity: A Brush-on-Brush Study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:10818-10830. [PMID: 31339320 DOI: 10.1021/acs.langmuir.9b00695] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
The stability of poly(N-isopropylacrylamide) (PNIPAM) brush-modified colloidal silica particles was compared to asymmetric and symmetric PNIPAM brush direct force measurements in the presence of 1, 10, and 500 mM aqueous salt solution of KCl, KNO3, and KSCN between 10 and 45 °C. Dynamic light scattering measurements highlighted subtle variations in the salt-mediated thermoresponse, while atomic force microscopy (AFM) force curves between a bare silica or PNIPAM brush-modified colloid probe and a planar PNIPAM brush elucidated differences in brush interactions. The AFM force curves in the presence of KCl primarily revealed steric interactions between the surfaces, while KNO3 and KSCN solutions exhibited electrosteric interactions on approach as a function of the chaotropic nature of the ion and the solution concentration. The symmetric PNIPAM brush interaction highlighted significant variations between KCl and KSCN at 1 and 500 mM concentrations, while the approach and retraction force curves were relatively similar at 10 mM concentration. The combination of these techniques enabled the stability of PNIPAM brush-modified colloidal dispersions in the presence of electrolyte to be better understood with specific ion binding and the solution Debye length playing a significant role.
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Affiliation(s)
- Ben A Humphreys
- Priority Research Centre for Advanced Particle Processing and Transport , University of Newcastle , Callaghan , NSW 2308 , Australia
| | - Edwin C Johnson
- Priority Research Centre for Advanced Particle Processing and Transport , University of Newcastle , Callaghan , NSW 2308 , Australia
| | - Erica J Wanless
- Priority Research Centre for Advanced Particle Processing and Transport , University of Newcastle , Callaghan , NSW 2308 , Australia
| | - Grant B Webber
- Priority Research Centre for Advanced Particle Processing and Transport , University of Newcastle , Callaghan , NSW 2308 , Australia
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16
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Schillén K, Galantini L, Du G, Del Giudice A, Alfredsson V, Carnerup AM, Pavel NV, Masci G, Nyström B. Block copolymers as bile salt sequestrants: intriguing structures formed in a mixture of an oppositely charged amphiphilic block copolymer and bile salt. Phys Chem Chem Phys 2019; 21:12518-12529. [PMID: 31145393 DOI: 10.1039/c9cp01744e] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
To study the formation and characterize the structure of mixed complexes of oppositely charged block copolymers and surfactants are of great significance for practical applications, e.g., in drug carrier formulations that are based on electrostatically assisted assembly. In this context, biocompatible block copolymers and biosurfactants (like bile salts) are particularly interesting. In this work, we report on the co-assembly in dilute aqueous solution between a cationic poly(N-isopropyl acryl amide) (PNIPAM) diblock copolymer and the oppositely charged bile salt surfactant sodium deoxycholate at ambient temperature. The cryogenic transmission electron microscopy (cryo-TEM) experiments revealed the co-existence of two types of co-assembled complexes of radically different morphology and inner structure. They are formed mainly as a result of the electrostatic attraction between the positively charged copolymer blocks and bile salt anions and highlight the potential of using linear amphiphilic block copolymers as bile salt sequestrants in the treatment of bile acid malabsorption and hypercholesterolemia. The first complex of globular morphology has a coacervate core of deoxycholate anions and charged copolymer blocks surrounded by a PNIPAM corona. The second complex has an intriguing tape-like supramolecular morphology of several micrometer in length that is striped in the direction of the long axis. A model is presented in which the stretched cationic blocks of several block copolymers interact electrostatically with the bile salt molecules that are associated to form a zipper-like structure. The tape is covered on both sides by the PNIPAM chains that stabilize the overall complex in solution. In addition to cryo-TEM, the mixed system was investigated in a range of molar charge fractions at a constant copolymer concentration by static light scattering, small angle X-ray scattering, and electrophoretic mobility measurements.
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Affiliation(s)
- Karin Schillén
- Division of Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden.
| | - Luciano Galantini
- Department of Chemistry, Sapienza University of Rome, P.O. Box 34-Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy.
| | - Guanqun Du
- Division of Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden.
| | - Alessandra Del Giudice
- Department of Chemistry, Sapienza University of Rome, P.O. Box 34-Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy.
| | - Viveka Alfredsson
- Division of Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden.
| | - Anna M Carnerup
- Division of Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden.
| | - Nicolae V Pavel
- Department of Chemistry, Sapienza University of Rome, P.O. Box 34-Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy.
| | - Giancarlo Masci
- Department of Chemistry, Sapienza University of Rome, P.O. Box 34-Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy.
| | - Bo Nyström
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern N-0315, Oslo, Norway
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17
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Korde JM, Kandasubramanian B. Fundamentals and Effects of Biomimicking Stimuli-Responsive Polymers for Engineering Functions. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b00683] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Jay M. Korde
- Biocomposite Laboratory, Department of Metallurgical & Materials Engineering, DIAT (DU), Ministry of Defence, Girinagar, Pune-411025, India
| | - Balasubramanian Kandasubramanian
- Biocomposite Laboratory, Department of Metallurgical & Materials Engineering, DIAT (DU), Ministry of Defence, Girinagar, Pune-411025, India
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18
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Highly-branched poly(N-isopropyl acrylamide) functionalised with pendant Nile red and chain end vancomycin for the detection of Gram-positive bacteria. Acta Biomater 2019; 87:197-206. [PMID: 30711663 PMCID: PMC6401204 DOI: 10.1016/j.actbio.2019.01.066] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2018] [Revised: 01/27/2019] [Accepted: 01/30/2019] [Indexed: 12/02/2022]
Abstract
This study shows how highly branched poly(N-isopropyl acrylamide) (HB-PNIPAM) with a chain pendant solvatochromic dye (Nile red) could provide a fluorescence signal, as end groups bind to bacteria and chain segments become desolvated, indicating the presence of bacteria. Vancomycin was attached to chain ends of HB-PNIPAM or as pendant groups on linear polymers each containing Nile red. Location of the dye was varied between placement in the core of the branched polymer coil or the outer domains. Both calorimetric and fluorescence data showed that branched polymers responded to binding of both the peptide target (D-Ala-D-Aa) and bacteria in a different manner than analogous linear polymers; binding and response was more extensive in the branched variant. The fluorescence data showed that only segments located in the outer domains of branched polymers responded to binding of Gram-positive bacteria with little response when linear analogous polymer or branched polymer with the dye in the inner core was exposed to Staphylococcus aureus.
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20
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Al-Baradi AM, Rimmer S, Carter SR, de Silva JP, King SM, Maccarini M, Farago B, Noirez L, Geoghegan M. Temperature-dependent structure and dynamics of highly-branched poly(N-isopropylacrylamide) in aqueous solution. SOFT MATTER 2018; 14:1482-1491. [PMID: 29400392 DOI: 10.1039/c7sm02330h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Small-angle neutron scattering (SANS) and neutron spin-echo (NSE) have been used to investigate the temperature-dependent solution behaviour of highly-branched poly(N-isopropylacrylamide) (HB-PNIPAM). SANS experiments have shown that water is a good solvent for both HB-PNIPAM and a linear PNIPAM control at low temperatures where the small angle scattering is described by a single correlation length model. Increasing the temperature leads to a gradual collapse of HB-PNIPAM until above the lower critical solution temperature (LCST), at which point aggregation occurs, forming disperse spherical particles of up to 60 nm in diameter, independent of the degree of branching. However, SANS from linear PNIPAM above the LCST is described by a model that combines particulate structure and a contribution from solvated chains. NSE was used to study the internal and translational solution dynamics of HB-PNIPAM chains below the LCST. Internal HB-PNIPAM dynamics is described well by the Rouse model for non-entangled chains.
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Affiliation(s)
- Ateyyah M Al-Baradi
- Department of Physics and Astronomy, University of Sheffield, Hounsfield Road, Sheffield S3 7RH, UK.
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21
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Zhuang Y, Cui M, Huang Z, Zou G, Zhang Q. Resilient collapse of thermal sensitive polymer on the surface of the optical fiber taper. ACTA ACUST UNITED AC 2018. [DOI: 10.1002/polb.24590] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Yiwei Zhuang
- CAS Key Laboratory of Soft Matter Chemistry, Key Laboratory of Optoelectronic Science and Technology, Innovation Centre of Chemistry for Energy Materials, Department of Polymer Science and Engineering; University of Science and Technology of China; Hefei Anhui 230026 People's Republic of China
| | - Minxin Cui
- CAS Key Laboratory of Soft Matter Chemistry, Key Laboratory of Optoelectronic Science and Technology, Innovation Centre of Chemistry for Energy Materials, Department of Polymer Science and Engineering; University of Science and Technology of China; Hefei Anhui 230026 People's Republic of China
| | - Zichao Huang
- CAS Key Laboratory of Soft Matter Chemistry, Key Laboratory of Optoelectronic Science and Technology, Innovation Centre of Chemistry for Energy Materials, Department of Polymer Science and Engineering; University of Science and Technology of China; Hefei Anhui 230026 People's Republic of China
| | - Gang Zou
- CAS Key Laboratory of Soft Matter Chemistry, Key Laboratory of Optoelectronic Science and Technology, Innovation Centre of Chemistry for Energy Materials, Department of Polymer Science and Engineering; University of Science and Technology of China; Hefei Anhui 230026 People's Republic of China
| | - Qijin Zhang
- CAS Key Laboratory of Soft Matter Chemistry, Key Laboratory of Optoelectronic Science and Technology, Innovation Centre of Chemistry for Energy Materials, Department of Polymer Science and Engineering; University of Science and Technology of China; Hefei Anhui 230026 People's Republic of China
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22
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Frysali MA, Anastasiadis SH. Temperature- and/or pH-Responsive Surfaces with Controllable Wettability: From Parahydrophobicity to Superhydrophilicity. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:9106-9114. [PMID: 28793185 DOI: 10.1021/acs.langmuir.7b02098] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Multifunctional surfaces with reversible wetting characteristics are fabricated utilizing end-anchored polymer chains on hierarchically roughened surfaces. Temperature- and/or pH-responsive surfaces are developed that exhibit reversible and controllable wettability, from the "parahydrophobic" behavior of natural plant leaves all the way to superhydrophilic properties in response to the external stimuli. For this purpose, dual scale micro/nanoroughened surfaces were prepared by laser irradiation of inorganic surfaces (Si wafers) utilizing ultrafast (femtosecond) laser pulses under a reactive gas atmosphere. End-functionalized polymer chains were anchored onto those surfaces utilizing the "grafting to" method; poly(N-isopropylacrylamide), PNIPAM, and poly(2-vinylpyridine), P2VP, were used for the formation of monofunctional as well as mixed brushes. The surfaces exhibit "parahydrophobic" behavior in the hydrophobic state (high temperature and/or high pH), with high static contact angles (∼120°) and high water adhesion (∼30° contact angle hysteresis), whereas they show superhydrophilic behavior in the hydrophilic state (low temperature and/or low pH). The surfaces were tested for their wettability under repetitive cycles and found to be stable and reproducible.
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Affiliation(s)
- Melani A Frysali
- Institute of Electronic Structure and Laser, Foundation for Research and Technology - Hellas , P.O. Box 1385, 711 10 Heraklion, Crete, Greece
- Department of Chemistry, University of Crete , P.O. Box 2208, 710 03 Heraklion, Crete, Greece
| | - Spiros H Anastasiadis
- Institute of Electronic Structure and Laser, Foundation for Research and Technology - Hellas , P.O. Box 1385, 711 10 Heraklion, Crete, Greece
- Department of Chemistry, University of Crete , P.O. Box 2208, 710 03 Heraklion, Crete, Greece
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Heinen S, Cuéllar-Camacho JL, Weinhart M. Thermoresponsive poly(glycidyl ether) brushes on gold: Surface engineering parameters and their implication for cell sheet fabrication. Acta Biomater 2017. [PMID: 28647625 DOI: 10.1016/j.actbio.2017.06.029] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Thermoresponsive polymer coatings, optimized for cell adhesion and thermally-triggered cell detachment, allow the fabrication of confluent cell sheets with intact extracellular matrix. However, rational design guidelines for such coatings are rare, since temperature-triggered cell adhesion and detachment from thermoresponsive surfaces are mechanistically not well understood. Herein, we investigated the impact of molecular weight (2, 9, 24kDa), grafting density (0.04-1.4 chains nm-2), morphology, and roughness of well-characterized thermoresponsive poly(glycidyl ether) brushes on the cell response at 37 and 20°C. NIH 3T3 mouse fibroblasts served as a model cell line for adhesion, proliferation, and cell sheet detachment. The cell response was correlated with serum protein adsorption from cell culture medium containing 10% fetal bovine serum. Intact cell sheets could be harvested from all the studied poly(glycidyl ether) coated surfaces, irrespective of the molecular weight, provided that the morphology of the coating was homogenous and the surface was fully shielded by the hydrated brush. The degree of chain overlap was estimated by the ratio of twice the polymer's Flory radius in a theta solvent to its interchain distance, which should be located in the strongly overlapping brush regime (2 Rf/l>1.4). In contrast, dense PNIPAM (2.5kDa) control monolayers did not induce protein adsorption from cell culture medium at 37°C and, as a result, did not allow a significant cell adhesion. These structural design parameters of functional poly(glycidyl ether) coatings on gold will contribute to future engineering of these thermoresponsive coatings on more common, cell culture relevant substrates. STATEMENT OF SIGNIFICANCE Cell sheet engineering as a scaffold-free approach towards tissue engineering resembles a milestone in regenerative medicine. The fabrication of confluent cell sheets maintains the extracellular matrix of cells which serves as the physiological cell scaffold. Thermoresponsive poly(glycidyl ether)s are highly cell-compatible and brushes thereof promote cell adhesion and growth without modification with additional cell adhesive ligands. Thus, a direct correlation of temperature-dependent serum protein adsorption and cell response with surface design parameters such as grafting density and molecular weight became accessible. Hence, surface engineering parameters of well-defined poly(glycidyl ether) monolayers for reproducible cell sheet fabrication have been identified. These design guidelines may also prove beneficial in the development of other brush-like thermoresponsive coatings for cell sheet engineering.
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24
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Gao Y, Wei M, Li X, Xu W, Ahiabu A, Perdiz J, Liu Z, Serpe MJ. Stimuli-responsive polymers: Fundamental considerations and applications. Macromol Res 2017. [DOI: 10.1007/s13233-017-5088-7] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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25
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Zeng J, Dong Z, Zhang Z, Liu Y. Preparation of a surface-grafted imprinted ceramic membrane for selective separation of molybdate anion from water solutions. JOURNAL OF HAZARDOUS MATERIALS 2017; 333:128-136. [PMID: 28342353 DOI: 10.1016/j.jhazmat.2017.03.016] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2016] [Revised: 03/03/2017] [Accepted: 03/07/2017] [Indexed: 06/06/2023]
Abstract
A surface-grafted imprinted ceramic membrane (IIP-PVI/CM) for recognizing molybdate (Mo(VI)) anion was prepared by surface-initiated graft-polymerization. Firstly, raw alumina ceramic membrane (CM) was deposited with SiO2 active layer by situ hydrolysis deposition method. Subsequently, γ-methacryloxy propyl trimethoxyl silane (MPS) was used as a coupling agent to introduce double bonds onto the SiO2 layer (MPS-CM). Then, 1-vinylimidazole (VI) was employed as a functional monomer to graft-polymerization onto the MPS-CM (PVI-CM). During the graft-polymerization, the influence factors of grafting degree of PVI were investigated in detail. Under optimum conditions (monomer concentration 20wt%, temperature 70°C, initiator amount 1.1wt% and reaction time 8h), the grafting degree of 20.39g/100g was obtained. Further, Mo(VI) anion was used as a template to imprint in the PVI-CM by employing 1,6-dibromohexane as a cross-linking agent, and then Mo(VI) was removed, obtaining the IIP-PVI/CM with many imprinted cavities for Mo(VI). Thereafter, static adsorption and dynamic separation properties of IIP-PVI/CM for Mo(VI) were studied. Results indicate that IIP-PVI/CM shows a specific selectivity for Mo(VI) with the adsorption capacity of 0.69mmol/100g, and the selectivity coefficient of IIP-PVI/CM is 7.48 for molybdate to tungstate anions. During the dynamic separation, IIP-PVI/CM has also good selectivity for separation of Mo(VI) and W(VI) anions.
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Affiliation(s)
- Jianxian Zeng
- School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China.
| | - Zhihui Dong
- School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China
| | - Zhe Zhang
- School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China
| | - Yuan Liu
- School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China
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26
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Li H, Liu P, Yuan J, Si J, Liu Y, Li H, Gao Y. Thermo-Responsive Brush Copolymers by “Grafting Through” Strategy Implemented on the Surface of the Macromonomer Micelles and Their High Emulsifying Performance. MACROMOL CHEM PHYS 2017. [DOI: 10.1002/macp.201700131] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Heng Li
- College of Chemistry and Key Laboratory of Polymeric Materials and Application Technology of Hunan Province, and; Key Laboratory of Advanced Functional Polymeric Materials of College of Hunan Province; Xiangtan University; 411105 Hunan Province China
| | - Pin Liu
- College of Chemistry and Key Laboratory of Polymeric Materials and Application Technology of Hunan Province, and; Key Laboratory of Advanced Functional Polymeric Materials of College of Hunan Province; Xiangtan University; 411105 Hunan Province China
| | - Jun Yuan
- College of Chemistry and Key Laboratory of Polymeric Materials and Application Technology of Hunan Province, and; Key Laboratory of Advanced Functional Polymeric Materials of College of Hunan Province; Xiangtan University; 411105 Hunan Province China
| | - Jiaqing Si
- College of Chemistry and Key Laboratory of Polymeric Materials and Application Technology of Hunan Province, and; Key Laboratory of Advanced Functional Polymeric Materials of College of Hunan Province; Xiangtan University; 411105 Hunan Province China
| | - Yijiang Liu
- College of Chemistry and Key Laboratory of Polymeric Materials and Application Technology of Hunan Province, and; Key Laboratory of Advanced Functional Polymeric Materials of College of Hunan Province; Xiangtan University; 411105 Hunan Province China
| | - Huaming Li
- College of Chemistry and Key Laboratory of Polymeric Materials and Application Technology of Hunan Province, and; Key Laboratory of Advanced Functional Polymeric Materials of College of Hunan Province; Xiangtan University; 411105 Hunan Province China
| | - Yong Gao
- College of Chemistry and Key Laboratory of Polymeric Materials and Application Technology of Hunan Province, and; Key Laboratory of Advanced Functional Polymeric Materials of College of Hunan Province; Xiangtan University; 411105 Hunan Province China
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27
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Vancaeyzeele C, Olivier F, Petroffe G, Peralta S, Vidal F. Nanostructured Thermal Responsive Materials Synthesized by Soft Templating. ACS APPLIED MATERIALS & INTERFACES 2017; 9:12706-12718. [PMID: 28304154 DOI: 10.1021/acsami.7b00028] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We capitalized herein the inherent tortuosity of bicontinuous microemulsion to conceive nanostructured drug-delivery devices. First, we show that it is possible to synthesize bicontinuous materials with continuous hydrophilic domains of the poly(N-isopropylacrylamide) (PNIPAM) network entangled with continuous hydrophobic polymer domains, with dual-phase continuity being imposed by the bicontinuous microemulsions used as a soft template. Particular attention is paid to the microemulsion formulations using a surfmer to preserve the one-to-one replication of the bicontinuous nanostructure after polymerization. These materials keep a volume phase transition with temperature that allows considering them as drug carriers for controlled release. PNIPAM, which plays the role of the active ingredient reservoir, is confined in the bicontinuous structure. As expected, the PNIPAM enclosure limits the surface area in contact with the releasing aqueous solution and thus slows down the desorption of aspirin, which is used as a model drug. The hydrophobic polymers play the role of in situ-created transport barriers without hindering it as all the loaded aspirin in this bicontinuous structure still remains available.
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Affiliation(s)
- Cedric Vancaeyzeele
- Laboratoire de Physicochimie des Polymères et des Interfaces (LPPI - EA 2528), I-Mat, Université de Cergy-Pontoise , 5 mail Gay-Lussac, 95031 Cergy-Pontoise, France
| | - Florian Olivier
- Laboratoire de Physicochimie des Polymères et des Interfaces (LPPI - EA 2528), I-Mat, Université de Cergy-Pontoise , 5 mail Gay-Lussac, 95031 Cergy-Pontoise, France
| | - Gwendoline Petroffe
- Laboratoire de Physicochimie des Polymères et des Interfaces (LPPI - EA 2528), I-Mat, Université de Cergy-Pontoise , 5 mail Gay-Lussac, 95031 Cergy-Pontoise, France
| | - Sebastien Peralta
- Laboratoire de Physicochimie des Polymères et des Interfaces (LPPI - EA 2528), I-Mat, Université de Cergy-Pontoise , 5 mail Gay-Lussac, 95031 Cergy-Pontoise, France
| | - Frederic Vidal
- Laboratoire de Physicochimie des Polymères et des Interfaces (LPPI - EA 2528), I-Mat, Université de Cergy-Pontoise , 5 mail Gay-Lussac, 95031 Cergy-Pontoise, France
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Lazzara G, Campbell RA, Bayati S, Zhu K, Nyström B, Nylander T, Schillén K. On the formation of inclusion complexes at the solid/liquid interface of anchored temperature-responsive PNIPAAM diblock copolymers with γ-cyclodextrin. Colloid Polym Sci 2017; 295:1327-1341. [PMID: 28794578 PMCID: PMC5519650 DOI: 10.1007/s00396-017-4052-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2017] [Revised: 02/08/2017] [Accepted: 02/14/2017] [Indexed: 11/08/2022]
Abstract
The thermal responsive behavior of adsorbed layers of diblock copolymers of poly(N-isopropylacrylamide) (PNIPAAM) and poly((3-acrylamidopropyl)trimethylammonium chloride) (PAMPTMA(+)) with γ-cyclodextrin (γ-CD) at the solid/liquid interface has been investigated using three in situ techniques: null ellipsometry, quartz-crystal microbalance with dissipation monitoring, and neutron reflectometry. The measurements provided information about the adsorbed amounts, the layer thickness, hydration and viscoelastic properties, and the interfacial structure and composition. The copolymers adsorb to silica with the cationic PAMPTMA(+) blocks sitting as anchors in a flat conformation and the PNIPAAM chains extending into the solution. The copolymer system alone exhibits reversible collapse above the lower critical solution temperature of PNIPAAM. The addition of γ-CD to pre-adsorbed copolymer layers results in a highly extended conformation as well as some loss of copolymer from the surface, which we discuss in terms of the formation of surface-invoked lateral steric repulsion of formed inclusion complexes.
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Affiliation(s)
- Giuseppe Lazzara
- Division of Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
- Department of Physics and Chemistry, University of Palermo, Viale delle Scienze, 90128 Palermo, IT Italy
| | | | - Solmaz Bayati
- Division of Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
- Akzo Nobel Surface Chemistry AB, Stenunge Allé 3, SE-444 85 Stenungsund, Sweden
| | - Kaizheng Zhu
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, 0315 Oslo, Norway
| | - Bo Nyström
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, 0315 Oslo, Norway
| | - Tommy Nylander
- Division of Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
| | - Karin Schillén
- Division of Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
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29
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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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30
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Mahalik JP, Sumpter BG, Kumar R. Vertical Phase Segregation Induced by Dipolar Interactions in Planar Polymer Brushes. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b01138] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Jyoti P. Mahalik
- Computer
Science and Mathematics
Division and Center for Nanophase Materials
Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Bobby G. Sumpter
- Computer
Science and Mathematics
Division and Center for Nanophase Materials
Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Rajeev Kumar
- Computer
Science and Mathematics
Division and Center for Nanophase Materials
Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
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31
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32
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Dalier F, Eghiaian F, Scheuring S, Marie E, Tribet C. Temperature-Switchable Control of Ligand Display on Adlayers of Mixed Poly(lysine)-g-(PEO) and Poly(lysine)-g-(ligand-modified poly-N-isopropylacrylamide). Biomacromolecules 2016; 17:1727-36. [DOI: 10.1021/acs.biomac.6b00136] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- F. Dalier
- Ecole Normale
Supérieure-PSL Research University, Dpt Chimie, Sorbonne Universités
- UPMC Univ. Paris 06, CNRS UMR 8640, 24 rue Lhomond, 75005 Paris, France
| | - F. Eghiaian
- U1006 INSERM,
Aix-Marseille Université, Parc Scientifique et Technologique
de Luminy, 163 av. de Luminy, 13009 Marseille, France
| | - S. Scheuring
- U1006 INSERM,
Aix-Marseille Université, Parc Scientifique et Technologique
de Luminy, 163 av. de Luminy, 13009 Marseille, France
| | - E. Marie
- Ecole Normale
Supérieure-PSL Research University, Dpt Chimie, Sorbonne Universités
- UPMC Univ. Paris 06, CNRS UMR 8640, 24 rue Lhomond, 75005 Paris, France
| | - C. Tribet
- Ecole Normale
Supérieure-PSL Research University, Dpt Chimie, Sorbonne Universités
- UPMC Univ. Paris 06, CNRS UMR 8640, 24 rue Lhomond, 75005 Paris, France
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33
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Ohashi H, Chi X, Kuroki H, Yamaguchi T. Response Sensitivity of a Gating Membrane Related to Grafted Polymer Characteristics. Ind Eng Chem Res 2016. [DOI: 10.1021/acs.iecr.5b04332] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hidenori Ohashi
- Chemical
Resources Laboratory, Tokyo Institute of Technology, R1-17, 4259
Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8503, Japan
| | - Xueqin Chi
- Chemical
Resources Laboratory, Tokyo Institute of Technology, R1-17, 4259
Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8503, Japan
| | - Hidenori Kuroki
- Chemical
Resources Laboratory, Tokyo Institute of Technology, R1-17, 4259
Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8503, Japan
- Kanagawa Academy of Science and Technology, R1-17, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8503, Japan
| | - Takeo Yamaguchi
- Chemical
Resources Laboratory, Tokyo Institute of Technology, R1-17, 4259
Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8503, Japan
- Kanagawa Academy of Science and Technology, R1-17, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8503, Japan
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34
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Bixner O, Kurzhals S, Virk M, Reimhult E. Triggered Release from Thermoresponsive Polymersomes with Superparamagnetic Membranes. MATERIALS (BASEL, SWITZERLAND) 2016; 9:E29. [PMID: 28787829 PMCID: PMC5456531 DOI: 10.3390/ma9010029] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Revised: 12/14/2015] [Accepted: 12/28/2015] [Indexed: 12/03/2022]
Abstract
Magnetic polymersomes were prepared by self-assembly of the amphiphilic block copolymer poly(isoprene-b-N-isopropylacrylamide) with monodisperse hydrophobic superparamagnetic iron oxide nanoparticles (SPION). The specifically designed thermoresponsive block copolymer allowed for efficient incorporation of the hydrophobic nanoparticles in the membrane core and encapsulation of the water soluble dye calcein in the lumen of the vesicles. Magnetic heating of the embedded SPIONs led to increased bilayer permeability through dehydration of the thermoresponsive PNIPAM block. The entrapped calcein could therefore be released in controlled doses solely through exposure to pulses of an alternating magnetic field. This hybrid SPION-polymersome system demonstrates a possible direction for release applications that merges rational polymersome design with addressed external magnetic field-triggered release through embedded nanomaterials.
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Affiliation(s)
- Oliver Bixner
- Institute for Biologically Inspired Materials, Department of Nanobiotechnology, University of Natural Resources and Life Sciences, Vienna, Muthgasse 11, Vienna 1190, Austria.
- School of Materials Science and Engineering, Centre for Biomimetic Sensor Science, Nanyang Technological University, 50 Nanyang Drive, 637553 Singapore.
| | - Steffen Kurzhals
- Institute for Biologically Inspired Materials, Department of Nanobiotechnology, University of Natural Resources and Life Sciences, Vienna, Muthgasse 11, Vienna 1190, Austria.
| | - Mudassar Virk
- Institute for Biologically Inspired Materials, Department of Nanobiotechnology, University of Natural Resources and Life Sciences, Vienna, Muthgasse 11, Vienna 1190, Austria.
| | - Erik Reimhult
- Institute for Biologically Inspired Materials, Department of Nanobiotechnology, University of Natural Resources and Life Sciences, Vienna, Muthgasse 11, Vienna 1190, Austria.
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35
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Philipp M, Körstgens V, Magerl D, Heller C, Yao Y, Wang W, Santoro G, Roth SV, Müller-Buschbaum P. Sorption of Water and Initial Stages of Swelling of Thin PNIPAM Films Using in Situ GISAXS Microfluidics. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:9619-9627. [PMID: 26280809 DOI: 10.1021/acs.langmuir.5b01978] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The sorption of low-molecular penetrants by thin polymer films, as well as structural changes provoked therein, is of high relevance for many fields of application. Complex permeation, diffusion, swelling, and dissolution processes are often induced within films by solvents or gases. Here, we use a novel in situ microfluidics-grazing incidence small-angle X-ray scattering (GISAXS) setup to examine changes in film thickness and in the surface structure of a thin polymer film that sorbs a good solvent. Thus, this technique is highly complementary to the established techniques on the field of diffusion in polymers. The initial stages of water uptake and swelling are resolved for a 50 nm thin, hydrophilic poly(N-isopropylacrylamide) (PNIPAM) film, before its dissolution sets in. The initial stages of swelling are tentatively described by anomalous swelling induced by a time- and space-dependent diffusion coefficient.
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Affiliation(s)
- Martine Philipp
- Lehrstuhl für Funktionelle Materialien, Physik-Department, Technische Universität München , James-Franck-Strasse 1, D-85748 Garching, Germany
| | - Volker Körstgens
- Lehrstuhl für Funktionelle Materialien, Physik-Department, Technische Universität München , James-Franck-Strasse 1, D-85748 Garching, Germany
| | - David Magerl
- Lehrstuhl für Funktionelle Materialien, Physik-Department, Technische Universität München , James-Franck-Strasse 1, D-85748 Garching, Germany
| | - Christoph Heller
- Lehrstuhl für Funktionelle Materialien, Physik-Department, Technische Universität München , James-Franck-Strasse 1, D-85748 Garching, Germany
| | - Yuan Yao
- Lehrstuhl für Funktionelle Materialien, Physik-Department, Technische Universität München , James-Franck-Strasse 1, D-85748 Garching, Germany
| | - Weijia Wang
- Lehrstuhl für Funktionelle Materialien, Physik-Department, Technische Universität München , James-Franck-Strasse 1, D-85748 Garching, Germany
| | - Gonzalo Santoro
- Photon Science, Deutsches Elektronen-Synchrotron (DESY) , Notkestrasse 85, D-22607 Hamburg, Germany
| | - Stephan V Roth
- Photon Science, Deutsches Elektronen-Synchrotron (DESY) , Notkestrasse 85, D-22607 Hamburg, Germany
| | - Peter Müller-Buschbaum
- Lehrstuhl für Funktionelle Materialien, Physik-Department, Technische Universität München , James-Franck-Strasse 1, D-85748 Garching, Germany
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36
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Yenice Z, Schön S, Bildirir H, Genzer J, von Klitzing R. Thermoresponsive PDMAEMA Brushes: Effect of Gold Nanoparticle Deposition. J Phys Chem B 2015; 119:10348-58. [DOI: 10.1021/acs.jpcb.5b04757] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | | | - Jan Genzer
- Department
of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695-7905, United States
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37
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Chin HY, Wang D, Schwartz DK. Dynamic Molecular Behavior on Thermoresponsive Polymer Brushes. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b00729] [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)
- Huai-Ying Chin
- Department of Chemical and
Biological Engineering, University of Colorado Boulder, Boulder, Colorado 80309, United States
| | - Dapeng Wang
- Department of Chemical and
Biological Engineering, University of Colorado Boulder, Boulder, Colorado 80309, United States
| | - Daniel K. Schwartz
- Department of Chemical and
Biological Engineering, University of Colorado Boulder, Boulder, Colorado 80309, United States
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38
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Léonforte F, Müller M. Poly(N-isopropylacrylamide)-Based Mixed Brushes: A Computer Simulation Study. ACS APPLIED MATERIALS & INTERFACES 2015; 7:12450-12462. [PMID: 25634688 DOI: 10.1021/am5076309] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Temperature-sensitive poly(N-isopropylacrylamide) (PNIPAM) polymer brushes of fixed molecular weight and grafting density are modeled in the framework of a coarse-grained model with soft, nonbonded interactions and an implicit solvent. This model has been developed to address experimentally relevant, large invariant degrees of polymerization, and nonbonded interactions are expressed via a third-order (virial) expansion of the equation of state. The choice of interaction parameters is intended to mimic the swelling behavior of PNIPAM in water as the temperature increases toward the lower critical solution temperature (T(LCST)). Results of molecular dynamics simulations for one component brushes are compared to experimental data. Mixed brushes incorporating small and large amounts of grafted poly(ethylene glycol) polymers are then considered. The effects of mixing polymer components on the response of the mixed brushes to temperature changes are monitored, and the results are compared to experimental data. In the end, two design principles for biomolecule triggering using temperature-sensitive mixed polymer brushes with functional and switchable end-groups are proposed and studied. This work is in favor of establishing qualitative rules for the design, optimization, and comprehension of binary polymer brushes for bioengineering purposes.
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Affiliation(s)
- Fabien Léonforte
- Institut für Theoretische Physik, Georg-August-Universität, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
| | - Marcus Müller
- Institut für Theoretische Physik, Georg-August-Universität, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
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39
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Pippa N, Meristoudi A, Pispas S, Demetzos C. Temperature-dependent drug release from DPPC:C12H25-PNIPAM-COOH liposomes: control of the drug loading/release by modulation of the nanocarriers' components. Int J Pharm 2015; 485:374-82. [PMID: 25776453 DOI: 10.1016/j.ijpharm.2015.03.014] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2015] [Revised: 03/05/2015] [Accepted: 03/09/2015] [Indexed: 01/20/2023]
Abstract
Novel polymer-modified thermosensitive liposomes were developed for the delivery of indomethacin in order to control its release profile. When attached to 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) liposomes, the end functionalized C12H25-poly(N-isopropylacrylamide)-COOH (C12H25-PNIPAM-COOH) polymer was membrane-disruptive in a temperature-dependent manner. The interest for this polymer is driven by its famous lower critical solution temperature (LCST) behavior, where heating an aqueous solution of PNIPAM above 32°C induces nanophase separation and polymer chain aggregation. The physicochemical/structural behavior of these polymer-modified thermosensitive liposomes was found to depend on the PNIPAM:lipid molar ratio and the composition of the polymeric guest. The incorporation of PNIPAM has caused alterations in the thermotropic behavior of DPPC liposomes, as the differential scanning calorimetry (DSC) experiments revealed. The drug loading and the release were found to be strongly dependent on the thermotropic characteristics of the PNIPAM grafted DPPC liposomes. Namely, the in vitro release is immediate at 37°C (>LCST) ("burst" effect), while the prepared mixed nanocarriers did not release the encapsulated bioactive substance at <32°C (<LCST). Thus, the thermosensitivity and the drug loading/release properties of the prepared formulations can be modulated by varying the ratio of DPPC/PNIPAM components, as well as the molecular characteristics of the polymeric guest.
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Affiliation(s)
- Natassa Pippa
- Department of Pharmaceutical Technology, Faculty of Pharmacy, National and Kapodistrian University of Athens, Panepistimioupolis Zografou 15771, Athens, Greece; Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, Athens 11635, Greece
| | - Anastasia Meristoudi
- Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, Athens 11635, Greece
| | - Stergios Pispas
- Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, Athens 11635, Greece
| | - Costas Demetzos
- Department of Pharmaceutical Technology, Faculty of Pharmacy, National and Kapodistrian University of Athens, Panepistimioupolis Zografou 15771, Athens, Greece.
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40
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Thermo- and pH-responsive fluorescence behaviors of sulfur-functionalized detonation nanodiamond-poly(N-isopropylacrylamide). Colloid Polym Sci 2015. [DOI: 10.1007/s00396-015-3531-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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41
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Gao S, Ge W, Zhao C, Cheng C, Jiang H, Wang X. Novel conjugated Ag@PNIPAM nanocomposites for an effective antibacterial wound dressing. RSC Adv 2015. [DOI: 10.1039/c5ra01199j] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
It is well known that nanosilver or silver ions could act as an effective antibacterial agent without the development of bacterial resistance but long term exposure may induce in vivo toxicity.
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Affiliation(s)
- Shengping Gao
- State Key Lab of Bioelectronics (Chien-Shiung WU Laboratory)
- Southeast University
- Nanjing 210096
- P. R. China
| | - Wei Ge
- State Key Lab of Bioelectronics (Chien-Shiung WU Laboratory)
- Southeast University
- Nanjing 210096
- P. R. China
| | - Chunqiu Zhao
- State Key Lab of Bioelectronics (Chien-Shiung WU Laboratory)
- Southeast University
- Nanjing 210096
- P. R. China
| | - Chuansheng Cheng
- State Key Lab of Bioelectronics (Chien-Shiung WU Laboratory)
- Southeast University
- Nanjing 210096
- P. R. China
- School of Chemistry and Chemical Engineering
| | - Hui Jiang
- State Key Lab of Bioelectronics (Chien-Shiung WU Laboratory)
- Southeast University
- Nanjing 210096
- P. R. China
| | - Xuemei Wang
- State Key Lab of Bioelectronics (Chien-Shiung WU Laboratory)
- Southeast University
- Nanjing 210096
- P. R. China
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42
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Hiruta Y, Nagumo Y, Miki A, Okano T, Kanazawa H. Effects of terminal group and chain length on temperature-responsive chromatography utilizing poly(N-isopropylacrylamide) synthesized via RAFT polymerization. RSC Adv 2015. [DOI: 10.1039/c5ra15906g] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Even using the same homo poly(N-isopropylacrylamide) immobilized silica beads as stationary phases, terminal functional group and chain length significantly affected temperature-dependent elution behavior of steroids.
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Affiliation(s)
- Yuki Hiruta
- Faculty of Pharmacy
- Keio University
- Tokyo 105-8512
- Japan
| | - Yuhei Nagumo
- Faculty of Pharmacy
- Keio University
- Tokyo 105-8512
- Japan
| | - Atsushi Miki
- Faculty of Pharmacy
- Keio University
- Tokyo 105-8512
- Japan
| | - Teruo Okano
- Institute of Advanced Biomedical Engineering and Science
- Tokyo Women's Medical University
- TWIns
- Tokyo 162-8666
- Japan
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43
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Zhu PW. Effects of Sodium Dodecyl Sulfate on Structures of Poly(N-isopropylacrylamide) at the Particle Surface. J Phys Chem B 2014; 119:359-71. [DOI: 10.1021/jp510350w] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Peng Wei Zhu
- Department of Materials Engineering, Monash University, Clayton, VIC 3800, Australia
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44
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Li JJ, Zhou YN, Luo ZH. Thermo-responsive brush copolymers with structure-tunable LCST and switchable surface wettability. POLYMER 2014. [DOI: 10.1016/j.polymer.2014.10.025] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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45
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Bastakoti BP, Guragain S, Nakashima K, Yamauchi Y. Stimuli-Induced Core-Corona Inversion of Micelle of Poly(acrylic acid)-block-Poly(N-isopropylacrylamide) and Its Application in Drug Delivery. MACROMOL CHEM PHYS 2014. [DOI: 10.1002/macp.201400440] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Bishnu Prasad Bastakoti
- World Premier International (WPI) Research Center for Materials; Nanoarchitectonics; National Institute for Materials Science (NIMS); 1-1 Namiki Tsukuba Ibaraki 305-0044 Japan
| | - Sudhina Guragain
- Department of Chemistry; Faculty of Science and Engineering; Saga University; 1 Honjo-machi Saga 840-8502 Japan
| | - Kenichi Nakashima
- Department of Chemistry; Faculty of Science and Engineering; Saga University; 1 Honjo-machi Saga 840-8502 Japan
| | - Yusuke Yamauchi
- World Premier International (WPI) Research Center for Materials; Nanoarchitectonics; National Institute for Materials Science (NIMS); 1-1 Namiki Tsukuba Ibaraki 305-0044 Japan
- Faculty of Science and Engineering; Waseda University; 3-4-1 Okubo Shinjuku Tokyo 169-8555 Japan
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46
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Aleksandrova R, Philipp M, Müller U, Riobóo RJ, Ostermeyer M, Sanctuary R, Müller-Buschbaum P, Krüger JK. phase instability and molecular kinetics provoked by repeated crossing of the demixing transition of PNIPAM solutions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:11792-11801. [PMID: 25215653 DOI: 10.1021/la5026763] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The demixing process of aqueous poly(N-isopropylacrylamide) (PNIPAM) solutions can occur either via a nucleation and growth process or via spinodal decomposition. The ensuing self-assembly, leading to heterogeneous morphologies within the PNIPAM solution, is codetermined by kinetic processes caused by molecular transport. By subjecting PNIPAM solutions to cyclic changes in temperature leading to repeated crossing of the demixing transition, we are able to assess the importance of kinetics as well as of overheating and supercooling of the phase transition within the metastable range delimited by the binodal and spinodal lines. First indications about the location of these stability limits for the low- and high-temperature phases, separated by about 1.6 K, could be gained by detailed kinetic studies of the refractive index. These investigations are made possible due to the novel technique of temperature-modulated optical refractometry.
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Affiliation(s)
- Ralitsa Aleksandrova
- Laboratoire de Physique des Matériaux, Université du Luxembourg , Campus Limpertsberg, 162A, avenue de la faïencerie, L-1511 Luxembourg, Luxembourg
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47
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Bojko A, Andreatta G, Montagne F, Renaud P, Pugin R. Fabrication of thermo-responsive nano-valve by grafting-to in melt of poly(N-isopropylacrylamide) onto nanoporous silicon nitride membranes. J Memb Sci 2014. [DOI: 10.1016/j.memsci.2014.05.048] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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48
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Ghosh Roy S, De P. Facile RAFT synthesis of side-chain amino acids containing pH-responsive hyperbranched and star architectures. Polym Chem 2014. [DOI: 10.1039/c4py00766b] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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49
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Chen L, Peng Z, Zeng Z, She Y, Wei J, Chen Y. Hairy polymeric nanocapsules with ph-responsive shell and thermoresponsive brushes: Tunable permeability for controlled release of water-soluble drugs. ACTA ACUST UNITED AC 2014. [DOI: 10.1002/pola.27233] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Lei Chen
- Institute of Polymers, Nanchang University; 999 Xuefu Avenue Nanchang 330031 China
| | - Zhiping Peng
- Institute of Polymers, Nanchang University; 999 Xuefu Avenue Nanchang 330031 China
| | - Zhipeng Zeng
- Institute of Polymers, Nanchang University; 999 Xuefu Avenue Nanchang 330031 China
| | - Yingqi She
- Institute of Polymers, Nanchang University; 999 Xuefu Avenue Nanchang 330031 China
| | - Junchao Wei
- Institute of Polymers, Nanchang University; 999 Xuefu Avenue Nanchang 330031 China
| | - Yiwang Chen
- Institute of Polymers, Nanchang University; 999 Xuefu Avenue Nanchang 330031 China
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50
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Chen Q, Kooij ES, Sui X, Padberg CJ, Hempenius MA, Schön PM, Vancso GJ. Collapse from the top: brushes of poly(N-isopropylacrylamide) in co-nonsolvent mixtures. SOFT MATTER 2014; 10:3134-42. [PMID: 24695793 DOI: 10.1039/c4sm00195h] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Using a combination of ellipsometry and friction force microscopy, we study the reversible swelling, collapse and variation in friction properties of covalently bound poly(N-isopropylacrylamide) (PNIPAM) layers on silicon with different grafting densities in response to exposure to good solvents and co-nonsolvent mixtures. Changes in the thickness and segment density distribution of grafted films are investigated by in situ ellipsometry. Based on quantitative modelling of the ellipsometry spectra, we postulate a structural model, which assumes that collapse takes place in the contacting layer between the brush and the co-nonsolvent and the top-collapsed brushes remain hydrated in the film interior. Using the structural model derived from ellipsometry spectra, we analyse the AFM based friction force microscopy data, which were obtained by silica colloidal probes. Results show a large increase of the friction coefficient of PNIPAM grafts when the grafts swollen by water are brought in contact with co-nonsolvents. For instance, the value of the friction coefficient for a medium density brush in water is four times lower than the value observed in a water-methanol (50% v/v) mixture. This increase of friction is accompanied by an increase in adherence between the PNIPAM chains and the silica colloidal probes, and is a result of chain collapse in the graft when contacted by a co-nonsolvent mixture in agreement with the model postulated on the basis of ellipsometric characterisation. The kinetic behaviour of the collapse is assessed by measuring the temporal variation of friction in situ as a function of elapsed time following contact with the co-nonsolvent as a function of graft density. In conclusion, the effect of co-nonsolvency influenced both the thickness of the PNIPAM brushes and the tribological behavior of the brush surfaces.
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Affiliation(s)
- Qi Chen
- Department of Materials Science and Technology of Polymers, University of Twente, MESA+ Institute for Nanotechnology, P.O. Box 217, 7500 AE Enschede, The Netherland.
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