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Niu H, Yang DL, Sun Q, Pu Y, Gao T, Wang JX. A new method for predicting the maximum filler loading of dental resin composites based on DEM simulations and experiments. Dent Mater 2020; 36:e375-e385. [PMID: 32980130 DOI: 10.1016/j.dental.2020.09.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Revised: 07/19/2020] [Accepted: 09/04/2020] [Indexed: 11/17/2022]
Abstract
OBJECTIVE The inorganic fillers in dental resin composites can enhance their mechanical properties and reduce polymerization shrinkage. When the usage amount of inorganic fillers is closed to maximum filler loading (MFL), the composites will usually achieve optimal performances. This study aims to develop a method that can predict the MFL of dental resin composites for the optimization of filler formulations. METHODS A method based on discrete element method (DEM) simulations and experiments was firstly developed to predict the MFL of spherical silica particles for single-level and multi-level filling. RESULTS The results indicate that the presence of modifier can increase the MFL, and the MFL increment can be exponentially changed with the content of the modifier. Compared with the single-level filling, the addition of secondary fillers is beneficial to increase the MFL, and the increment can be affected by the particle size and size ratio. The prediction results show a good agreement with the experiment results. SIGNIFICANCE The accuracy of prediction results indicates a great potential of DEM simulations as a numerical experimental method in studying the MFL, and provides an effective method for the optimization of filler formulations.
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Affiliation(s)
- Hao Niu
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, PR China; Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing, 100029, PR China
| | - Dan-Lei Yang
- Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing, 100029, PR China
| | - Qian Sun
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, PR China; Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing, 100029, PR China
| | - Yuan Pu
- Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing, 100029, PR China.
| | - Tianyu Gao
- School of Automation, China University of Geosciences, Wuhan 430074, PR China
| | - Jie-Xin Wang
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, PR China; Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing, 100029, PR China.
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2
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Madkour M, Bumajdad A, Al-Sagheer F. To what extent do polymeric stabilizers affect nanoparticles characteristics? Adv Colloid Interface Sci 2019; 270:38-53. [PMID: 31174003 DOI: 10.1016/j.cis.2019.05.004] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Revised: 05/03/2019] [Accepted: 05/05/2019] [Indexed: 01/28/2023]
Abstract
Colloidal synthesis of nanoparticles using polymeric stabilizers as a template of a structure directing agent provided a plethora of opportunities in fabricating nanoparticles (NPs) with controlled size, shape, composition and structural characteristics. To understand the complete potency of polymeric stabilizers during the synthesis of nanoparticles, the relationship between polymer characteristics such as structure, molecular weight and concentration and nanoparticles characteristics is discussed in depth. This review portrays the use of polymers to attain nanostructured materials via covalent and non-covalent approaches. These polymers can also serve as surfaces modifier as well as the growth regulators during the synthesis of nanomaterials. The effect provided by polymers that directs the formation of nanomaterials into desired forms is otherwise hard to achieve. We especially spotlight on the approaches for tuning the characteristic properties of nanoparticles via cautious choice of the polymer system with special focus to stimuli-responsive polymers. This review mainly focusses on answering the main challenging question; what is the ideal polymeric stabilizer system to obtain specific morphology, size and phase structure of nanoparticles? Such vital information will enable rational design of nanoparticles to meet specific needs for different applications.
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3
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Kocak G, Solmaz G, Tuncer C, Bütün V. Modification of glycidyl methacrylate based block copolymers and their aqueous solution behaviours. Eur Polym J 2019. [DOI: 10.1016/j.eurpolymj.2018.11.046] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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4
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Tian J, Huang B, Xiao C, Vana P. Intelligent CO2- and photo-dual-responsive polymer vesicles with tunable wall thickness. Polym Chem 2019. [DOI: 10.1039/c8py01743c] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
CO2- and photo-dual-responsive polymer vesicles with tunable wall thickness were explored and used as a potential “smart” platform for drug release.
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Affiliation(s)
- Jia Tian
- Shanghai Key Laboratory of Functional Materials Chemistry
- East China University of Science and Technology
- Shanghai 200237
- People's Republic of China
| | - Baoxuan Huang
- Shanghai Key Laboratory of Functional Materials Chemistry
- East China University of Science and Technology
- Shanghai 200237
- People's Republic of China
| | - Chao Xiao
- Shanghai Key Laboratory of Functional Materials Chemistry
- East China University of Science and Technology
- Shanghai 200237
- People's Republic of China
| | - Philipp Vana
- Institute of Physical Chemistry
- Georg-August-University Göttingen
- D-37077 Göttingen
- Germany
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5
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Han L, Xiang L, Zhang J, Chen J, Liu J, Yan B, Zeng H. Biomimetic Lubrication and Surface Interactions of Dopamine-Assisted Zwitterionic Polyelectrolyte Coatings. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:11593-11601. [PMID: 30156852 DOI: 10.1021/acs.langmuir.8b02473] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
A bioinspired zwitterionic polyelectrolyte coating with excellent hydration ability has been regarded as a promising lubricating candidate for modifying artificial joint cartilage surface. In physiological fluids, the ubiquitous proteins play an important role in achieving outstanding boundary lubrication; however, a comprehensive understanding of the hydration lubrication between polyelectrolyte coatings and proteins still remains unclear. In this work, a facile fabrication of ultrasmooth polyelectrolyte coatings was developed via codeposition of synthesized poly(dopamine methacrylamide- co-2-methacryloyloxyethyl phosphorylcholine) (P(DMA- co-MPC)) and dopamine (DA) in a mild condition. Upon optimization of the feeding ratio of P(DMA- co-MPC) and DA, the as-fabricated PDA/P(DMA- co-MPC) coatings exhibit excellent lubricating properties when sliding with each other (friction coefficient μ = 0.036 ± 0.002, ∼2.8 MPa), as well as sliding with a model protein (bovine serum albumin (BSA)) layer (μ = 0.041 ± 0.005, ∼4.8 MPa) in phosphate-buffered saline (PBS, pH 7.4). Intriguingly, the lubrication in both systems shows Amontons-like behaviors: the friction is directly proportional to the applied load but independent of the shear velocity. Moreover, the PDA/P(DMA- co-MPC) coatings could resist the protein fouling (i.e., BSA) in PBS, which is crucial to prevent the surfaces from being contaminated when applied in biological media, thus maintaining their lubricating properties. Our results provide a versatile approach for facilely fabricating polyelectrolyte coatings with superior lubrication properties to both polyelectrolyte coatings and protein surfaces, with useful implications into the development of novel lubricating coatings for bioengineering applications (e.g., artificial joints).
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Affiliation(s)
- Linbo Han
- College of Health Science and Environmental Engineering , Shenzhen Technology University , Shenzhen 518118 , China
- Chemical and Materials Engineering , University of Alberta , Edmonton , Alberta T6G 1H9 , Canada
| | - Li Xiang
- Chemical and Materials Engineering , University of Alberta , Edmonton , Alberta T6G 1H9 , Canada
| | - Jiawen Zhang
- Chemical and Materials Engineering , University of Alberta , Edmonton , Alberta T6G 1H9 , Canada
| | - Jingsi Chen
- Chemical and Materials Engineering , University of Alberta , Edmonton , Alberta T6G 1H9 , Canada
| | - Jifang Liu
- Chemical and Materials Engineering , University of Alberta , Edmonton , Alberta T6G 1H9 , Canada
- The Fifth Affiliated Hospital , Guangzhou Medical University , Guangzhou , Guangdong 510700 , China
| | - Bin Yan
- Chemical and Materials Engineering , University of Alberta , Edmonton , Alberta T6G 1H9 , Canada
- College of Light Industry, Textile & Food Engineering, Sichuan University , Chengdu 610065 , China
| | - Hongbo Zeng
- College of Health Science and Environmental Engineering , Shenzhen Technology University , Shenzhen 518118 , China
- Chemical and Materials Engineering , University of Alberta , Edmonton , Alberta T6G 1H9 , Canada
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6
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Mishra S, Ashaduzzaman M, Mishra P, Swart HC, Turner AP, Tiwari A. Stimuli-enabled zipper-like graphene interface for auto-switchable bioelectronics. Biosens Bioelectron 2017; 89:305-311. [DOI: 10.1016/j.bios.2016.03.052] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2016] [Revised: 03/20/2016] [Accepted: 03/21/2016] [Indexed: 11/17/2022]
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7
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Zoppe JO, Ataman NC, Mocny P, Wang J, Moraes J, Klok HA. Surface-Initiated Controlled Radical Polymerization: State-of-the-Art, Opportunities, and Challenges in Surface and Interface Engineering with Polymer Brushes. Chem Rev 2017; 117:1105-1318. [PMID: 28135076 DOI: 10.1021/acs.chemrev.6b00314] [Citation(s) in RCA: 598] [Impact Index Per Article: 85.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The generation of polymer brushes by surface-initiated controlled radical polymerization (SI-CRP) techniques has become a powerful approach to tailor the chemical and physical properties of interfaces and has given rise to great advances in surface and interface engineering. Polymer brushes are defined as thin polymer films in which the individual polymer chains are tethered by one chain end to a solid interface. Significant advances have been made over the past years in the field of polymer brushes. This includes novel developments in SI-CRP, as well as the emergence of novel applications such as catalysis, electronics, nanomaterial synthesis and biosensing. Additionally, polymer brushes prepared via SI-CRP have been utilized to modify the surface of novel substrates such as natural fibers, polymer nanofibers, mesoporous materials, graphene, viruses and protein nanoparticles. The last years have also seen exciting advances in the chemical and physical characterization of polymer brushes, as well as an ever increasing set of computational and simulation tools that allow understanding and predictions of these surface-grafted polymer architectures. The aim of this contribution is to provide a comprehensive review that critically assesses recent advances in the field and highlights the opportunities and challenges for future work.
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Affiliation(s)
- Justin O Zoppe
- Institut des Matériaux and Institut des Sciences et Ingénierie Chimiques, Laboratoire des Polymères Bâtiment MXD, Ecole Polytechnique Fédérale de Lausanne (EPFL) , Station 12 CH-1015 Lausanne, Switzerland
| | - Nariye Cavusoglu Ataman
- Institut des Matériaux and Institut des Sciences et Ingénierie Chimiques, Laboratoire des Polymères Bâtiment MXD, Ecole Polytechnique Fédérale de Lausanne (EPFL) , Station 12 CH-1015 Lausanne, Switzerland
| | - Piotr Mocny
- Institut des Matériaux and Institut des Sciences et Ingénierie Chimiques, Laboratoire des Polymères Bâtiment MXD, Ecole Polytechnique Fédérale de Lausanne (EPFL) , Station 12 CH-1015 Lausanne, Switzerland
| | - Jian Wang
- Institut des Matériaux and Institut des Sciences et Ingénierie Chimiques, Laboratoire des Polymères Bâtiment MXD, Ecole Polytechnique Fédérale de Lausanne (EPFL) , Station 12 CH-1015 Lausanne, Switzerland
| | - John Moraes
- Institut des Matériaux and Institut des Sciences et Ingénierie Chimiques, Laboratoire des Polymères Bâtiment MXD, Ecole Polytechnique Fédérale de Lausanne (EPFL) , Station 12 CH-1015 Lausanne, Switzerland
| | - Harm-Anton Klok
- Institut des Matériaux and Institut des Sciences et Ingénierie Chimiques, Laboratoire des Polymères Bâtiment MXD, Ecole Polytechnique Fédérale de Lausanne (EPFL) , Station 12 CH-1015 Lausanne, Switzerland
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8
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Boyer C, Corrigan NA, Jung K, Nguyen D, Nguyen TK, Adnan NNM, Oliver S, Shanmugam S, Yeow J. Copper-Mediated Living Radical Polymerization (Atom Transfer Radical Polymerization and Copper(0) Mediated Polymerization): From Fundamentals to Bioapplications. Chem Rev 2015; 116:1803-949. [DOI: 10.1021/acs.chemrev.5b00396] [Citation(s) in RCA: 356] [Impact Index Per Article: 39.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Cyrille Boyer
- Australian Centre for Nanomedicine, and ‡Centre for Advanced
Macromolecular
Design (CAMD), School of Chemical Engineering, University of New South Wales, Sydney 2052, Australia
| | - Nathaniel Alan Corrigan
- Australian Centre for Nanomedicine, and ‡Centre for Advanced
Macromolecular
Design (CAMD), School of Chemical Engineering, University of New South Wales, Sydney 2052, Australia
| | - Kenward Jung
- Australian Centre for Nanomedicine, and ‡Centre for Advanced
Macromolecular
Design (CAMD), School of Chemical Engineering, University of New South Wales, Sydney 2052, Australia
| | - Diep Nguyen
- Australian Centre for Nanomedicine, and ‡Centre for Advanced
Macromolecular
Design (CAMD), School of Chemical Engineering, University of New South Wales, Sydney 2052, Australia
| | - Thuy-Khanh Nguyen
- Australian Centre for Nanomedicine, and ‡Centre for Advanced
Macromolecular
Design (CAMD), School of Chemical Engineering, University of New South Wales, Sydney 2052, Australia
| | - Nik Nik M. Adnan
- Australian Centre for Nanomedicine, and ‡Centre for Advanced
Macromolecular
Design (CAMD), School of Chemical Engineering, University of New South Wales, Sydney 2052, Australia
| | - Susan Oliver
- Australian Centre for Nanomedicine, and ‡Centre for Advanced
Macromolecular
Design (CAMD), School of Chemical Engineering, University of New South Wales, Sydney 2052, Australia
| | - Sivaprakash Shanmugam
- Australian Centre for Nanomedicine, and ‡Centre for Advanced
Macromolecular
Design (CAMD), School of Chemical Engineering, University of New South Wales, Sydney 2052, Australia
| | - Jonathan Yeow
- Australian Centre for Nanomedicine, and ‡Centre for Advanced
Macromolecular
Design (CAMD), School of Chemical Engineering, University of New South Wales, Sydney 2052, Australia
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9
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Xie J, Nakai K, Ohno S, Butt HJ, Koynov K, Yusa SI. Fluorescence Correlation Spectroscopy Monitors the Hydrophobic Collapse of pH-Responsive Hairy Nanoparticles at the Individual Particle Level. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b01435] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jing Xie
- Max Planck Institute
for Polymer Research, Ackermannweg
10, 55128 Mainz, Germany
| | - Keita Nakai
- Graduate
School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280, Japan
| | - Sayaka Ohno
- Graduate
School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280, Japan
| | - Hans-Juergen Butt
- Max Planck Institute
for Polymer Research, Ackermannweg
10, 55128 Mainz, Germany
| | - Kaloian Koynov
- Max Planck Institute
for Polymer Research, Ackermannweg
10, 55128 Mainz, Germany
| | - Shin-ichi Yusa
- Graduate
School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280, Japan
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10
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Wu L, Glebe U, Böker A. Surface-initiated controlled radical polymerizations from silica nanoparticles, gold nanocrystals, and bionanoparticles. Polym Chem 2015. [DOI: 10.1039/c5py00525f] [Citation(s) in RCA: 97] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
This review summarizes recent progress in surface-initiated controlled radical polymerizations from silica nanoparticles, gold nanocrystals, and bionanoparticles.
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Affiliation(s)
- Lei Wu
- Fraunhofer Institute for Applied Polymer Research IAP
- 14476 Potsdam-Golm
- Germany
- DWI – Leibniz Institute for Interactive Materials e.V
- Lehrstuhl für Makromolekulare Materialien und Oberflächen
| | - Ulrich Glebe
- Fraunhofer Institute for Applied Polymer Research IAP
- 14476 Potsdam-Golm
- Germany
| | - Alexander Böker
- Fraunhofer Institute for Applied Polymer Research IAP
- 14476 Potsdam-Golm
- Germany
- Lehrstuhl für Polymermaterialien und Polymertechnologie
- Universität Potsdam
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11
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Yang D, Xie L, Bobicki E, Xu Z, Liu Q, Zeng H. Probing anisotropic surface properties and interaction forces of chrysotile rods by atomic force microscopy and rheology. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:10809-10817. [PMID: 25115179 DOI: 10.1021/la5019373] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Understanding the surface properties and interactions of nonspherical particles is of both fundamental and practical importance in the rheology of complex fluids in various engineering applications. In this work, natural chrysotile, a phyllosilicate composed of 1:1 stacked silica and brucite layers which coil into cylindrical structure, was chosen as a model rod-shaped particle. The interactions of chrysotile brucite-like basal or bilayered edge planes and a silicon nitride tip were measured using an atomic force microscope (AFM). The force-distance profiles were fitted using the classical Derjaguin-Landau-Verwey-Overbeek (DLVO) theory, which demonstrates anisotropic and pH-dependent surface charge properties of brucite-like basal plane and bilayered edge surface. The points of zero charge (PZC) of the basal and edge planes were estimated to be around pH 10-11 and 6-7, respectively. Rheology measurements of 7 vol % chrysotile (with an aspect ratio of 14.5) in 10 mM NaCl solution showed pH-dependent yield stress with a local maximum around pH 7-9, which falls between the two PZC values of the edge and basal planes of the rod particles. On the basis of the surface potentials of the edge and basal planes obtained from AFM measurements, theoretical analysis of the surface interactions of edge-edge, basal-edge, and basal-basal planes of the chrysotile rods suggests the yield stress maximum observed could be mainly attributed to the basal-edge attractions. Our results indicate that the anisotropic surface properties (e.g., charges) of chrysotile rods play an important role in the particle-particle interaction and rheological behavior, which also provides insight into the basic understanding of the colloidal interactions and rheology of nonspherical particles.
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Affiliation(s)
- Dingzheng Yang
- Department of Chemical and Materials Engineering, University of Alberta , Edmonton, Alberta T6G 2 V4, Canada
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12
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Synthesis and property of polystyrene particle with smart surface by emulsion polymerization using “giant” surfactant. POLYMER 2014. [DOI: 10.1016/j.polymer.2014.03.053] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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13
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Willott JD, Murdoch TJ, Humphreys BA, Edmondson S, Webber GB, Wanless EJ. Critical salt effects in the swelling behavior of a weak polybasic brush. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:1827-36. [PMID: 24476028 DOI: 10.1021/la4047275] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
The swelling behavior of poly(2-(diethylamino)ethyl methacrylate) (PDEA) brushes in response to changes in solution pH and ionic strength has been investigated. The brushes were synthesized by ARGET ATRP methodology at the silica-aqueous solution interface via two different surface-bound initiator approaches: electrostatically adsorbed cationic macroinitiator and covalently anchored silane-based ATRP initiator moieties. The pH-response of these brushes is studied as a function of the solvated brush thickness in a constant flow regime that elucidates the intrinsic behavior of polymer brushes. In situ ellipsometry equilibrium measurements show the pH-induced brush swelling and collapse transitions are hysteretic in nature. Furthermore, high temporal resolution kinetic studies demonstrate that protonation and solvent ingress during swelling occur much faster than the brush charge neutralization and solvent expulsion during collapse. This hysteresis is attributed to the formation of a dense outer region or skin during collapse that retards solvent egress. Moreover, at a constant pH below its pKa, the PDEA brush exhibited a critical conformational change in the range 0.5-1 mM electrolyte, a range much narrower than predicted by the theory of the osmotic brush regime. This behavior is attributed to the hydrophobicity of the collapsed brush. The swelling and collapse kinetics for this salt-induced transition are nearly identical. This is in contrast to the asymmetry in the rate of the pH-induced response, suggesting an alternative mechanism for the two processes dependent on the nature of the environmental trigger.
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Affiliation(s)
- Joshua D Willott
- Priority Research Centre for Advanced Particle Processing and Transport, University of Newcastle , Callaghan, NSW 2308, Australia
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14
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Ebara M, Kotsuchibashi Y, Uto K, Aoyagi T, Kim YJ, Narain R, Idota N, Hoffman JM. Smart Nanoassemblies and Nanoparticles. NIMS MONOGRAPHS 2014. [DOI: 10.1007/978-4-431-54400-5_3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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15
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Banerjee S, Paira TK, Mandal TK. Surface confined atom transfer radical polymerization: access to custom library of polymer-based hybrid materials for speciality applications. Polym Chem 2014. [DOI: 10.1039/c4py00007b] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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16
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Kotsuchibashi Y, Wang Y, Kim YJ, Ebara M, Aoyagi T, Narain R. Simple coating with pH-responsive polymer-functionalized silica nanoparticles of mixed sizes for controlled surface properties. ACS APPLIED MATERIALS & INTERFACES 2013; 5:10004-10010. [PMID: 24059283 DOI: 10.1021/am403007f] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Different-sized silica nanoparticles (SiNPs) were functionalized by pH-responsive poly(2-(diisopropylamino)ethyl methacrylate) (PDP) via surface-initiated atom transfer radical polymerization (ATRP). The functionalized PDP-SiNPs were used to coat glass surfaces, polymeric nanofibers, and paper via simple coating methods such as dip, cast, and spray coating. A PDP-SiNPs mixture having different sizes was found to change the surface properties of the substrates remarkably, compared to one containing PDP-SiNPs with uniform sizes. High surface roughness was achieved with very little coating materials, which is beneficial from an economical point of view. Moreover, adsorption/desorption of PDP-SiNPs onto/from the substrates could be controlled by changing solution pH due to the protonation/deprotonation of the PDP. The surface properties of the coated substrates were analyzed by contact angle (CA) measurement, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). This inexpensive system provides a simple, quick, and effective approach to changing the surface properties of substrates that could be exploited for large-scale surface modification.
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Affiliation(s)
- Yohei Kotsuchibashi
- Department of Chemical and Materials Engineering, University of Alberta , Edmonton, Alberta, T6G 2V4, Canada
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17
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Cheesman BT, Neilson AJG, Willott JD, Webber GB, Edmondson S, Wanless EJ. Effect of colloidal substrate curvature on pH-responsive polyelectrolyte brush growth. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:6131-6140. [PMID: 23617419 DOI: 10.1021/la4004092] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Coatings consisting of polymer brushes are an effective way to modify solid interfaces. Polymer brush-modified hybrid particles have been prepared by surface-initiated activators regenerated by electron transfer atom transfer radical polymerization (SI-ARGET ATRP) of 2-(diethylamino)ethyl methacrylate (DEA) on silica particles. We have optimized the synthesis with respect to changing the reducing agent, temperature, and reaction solvent from an aqueous ethanol mixture to an aqueous methanol mixture. Our flexible electrostatically adsorbed macroinitiator approach allows for the modification of a variety of surfaces. Polybasic brushes have been grown on silica particles of different sizes, from 120 to 840 nm in diameter, as well as on wafers, and a comparison of the products has allowed the effect of surface curvature to be elucidated. An examination of the thickness of the dry brush and the aqueous hydrodynamic brush at both pH 7 and at 4 demonstrated that growth increased substantially with substrate curvature for particles with a diameter below 450 nm. This is attributed to the increasing separation between active chain ends, reducing the rate of termination. This is believed to be the first time that this effect has been demonstrated experimentally. Furthermore, we have seen that polymer brush growth on planar wafers was significantly reduced when the reaction mixture was stirred.
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Affiliation(s)
- Benjamin T Cheesman
- Priority Research Centre for Advanced Particle Processing and Transport, University of Newcastle , Callaghan, NSW 2308, Australia
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18
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Cheesman BT, Smith EG, Murdoch TJ, Guibert C, Webber GB, Edmondson S, Wanless EJ. Polyelectrolyte brush pH-response at the silica–aqueous solution interface: a kinetic and equilibrium investigation. Phys Chem Chem Phys 2013; 15:14502-10. [DOI: 10.1039/c3cp52281d] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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