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Huang J, Tang Y, Wang P, Zhou H, Li H, Cheng Z, Wu Y, Xie Z, Cai Z, Wu D, Shen H. One-Pot Construction of Articular Cartilage-Like Hydrogel Coating for Durable Aqueous Lubrication. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2309141. [PMID: 38339915 DOI: 10.1002/adma.202309141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 01/22/2024] [Indexed: 02/12/2024]
Abstract
Articular cartilage has an appropriate multilayer structure and superior tribological properties and provides a structural paradigm for design of lubricating materials. However, mimicking articular cartilage traits on prosthetic materials with durable lubrication remains a huge challenge. Herein, an ingenious three-in-one strategy is developed for constructing an articular cartilage-like bilayer hydrogel coating on the surface of ultra-high molecular weight polyethylene (BH-UPE), which makes full use of conceptions of interfacial interlinking, high-entanglement crosslinking, and interface-modulated polymerization. The hydrogel coating is tightly interlinked with UPE substrate through hydrogel-UPE interchain entanglement and bonding. The hydrogel chains are highly entangled with each other to form a dense tough layer with negligible hysteresis for load-bearing by reducing the amounts of crosslinker and hydrophilic initiator to p.p.m. levels. Meanwhile, the polymerization of monomers in the top surface region is suppressed via interface-modulated polymerization, thus introducing a porous surface for effective aqueous lubrication. As a result, BH-UPE exhibits an ultralow friction coefficient of 0.0048 during 10 000 cycles under a load of 0.9 MPa, demonstrating great potential as an advanced bearing material for disc prosthesis. This work may provide a new way to build stable bilayer coatings and have important implications for development of biological lubricating materials.
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Affiliation(s)
- Jiajun Huang
- The Eighth Affiliated Hospital, Sun Yat-sen University, Shenzhen, 518033, P. R. China
| | - Youchen Tang
- The Eighth Affiliated Hospital, Sun Yat-sen University, Shenzhen, 518033, P. R. China
| | - Peng Wang
- The Eighth Affiliated Hospital, Sun Yat-sen University, Shenzhen, 518033, P. R. China
| | - Hao Zhou
- The Eighth Affiliated Hospital, Sun Yat-sen University, Shenzhen, 518033, P. R. China
| | - He Li
- The Eighth Affiliated Hospital, Sun Yat-sen University, Shenzhen, 518033, P. R. China
| | - Ziying Cheng
- The Eighth Affiliated Hospital, Sun Yat-sen University, Shenzhen, 518033, P. R. China
| | - Yanfeng Wu
- The Eighth Affiliated Hospital, Sun Yat-sen University, Shenzhen, 518033, P. R. China
| | - Zhongyu Xie
- The Eighth Affiliated Hospital, Sun Yat-sen University, Shenzhen, 518033, P. R. China
| | - Zhaopeng Cai
- The Eighth Affiliated Hospital, Sun Yat-sen University, Shenzhen, 518033, P. R. China
| | - Dingcai Wu
- The Eighth Affiliated Hospital, Sun Yat-sen University, Shenzhen, 518033, P. R. China
- PCFM Lab, School of Chemistry, Sun Yat-sen University, Guangzhou, 510006, P. R. China
| | - Huiyong Shen
- The Eighth Affiliated Hospital, Sun Yat-sen University, Shenzhen, 518033, P. R. China
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Hasan MM, Johnson CL, Dunn AC. Soft Contact Mechanics with Gradient-Stiffness Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:9454-9465. [PMID: 35895905 DOI: 10.1021/acs.langmuir.2c00296] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The stiffness in the top surface of many biological entities like cornea or articular cartilage, as well as chemically cross-linked synthetic hydrogels, can be significantly lower or more compliant than the bulk. When such a heterogeneous surface comes into contact, the contacting load is distributed differently from typical contact models. The mechanical response under indentation loading of a surface with a gradient of stiffness is a complex, integrated response that necessarily includes the heterogeneity. In this work, we identify empirical contact models between a rigid indenter and gradient elastic surfaces by numerically simulating quasi-static indentation. Three key case studies revealed the specific ways in which (I) continuous gradients, (II) laminate-layer gradients, and (III) alternating gradients generate new contact mechanics at the shallow-depth limit. Validation of the simulation-generated models was done by micro- and nanoindentation experiments on polyacrylamide samples synthesized to have a softer gradient surface layer. The field of stress and stretch in the subsurface as visualized from the simulations also reveals that the gradient layers become confined, which pushes the stretch fields closer to the surface and radially outward. Thus, contact areas are larger than expected, and average contact pressures are lower than predicted by the Hertz model. The overall findings of this work are new contact models and the mechanisms by which they change. These models allow a more accurate interpretation of the plethora of indentation data on surface gradient soft matter (biological and synthetic) as well as a better prediction of the force response to gradient soft surfaces. This work provides examples of how gradient hydrogel surfaces control the subsurface stress distribution and loading response.
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Affiliation(s)
- Md Mahmudul Hasan
- Department of Mechanical Science and Engineering, University of Illinois Urbana-Champaign, 1206 W Green St., Urbana, Illinois 61801, United States
| | - Christopher L Johnson
- Department of Mechanical Science and Engineering, University of Illinois Urbana-Champaign, 1206 W Green St., Urbana, Illinois 61801, United States
| | - Alison C Dunn
- Department of Mechanical Science and Engineering, University of Illinois Urbana-Champaign, 1206 W Green St., Urbana, Illinois 61801, United States
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Xi Y, Sharma PK, Kaper HJ, Choi CH. Tribological Properties of Micropored Poly(2-hydroxyethyl methacrylate) Hydrogels in a Biomimetic Aqueous Environment. ACS APPLIED MATERIALS & INTERFACES 2021; 13:41473-41484. [PMID: 34449208 DOI: 10.1021/acsami.1c13718] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The applications of hydrogels in tissue engineering as implants have rapidly grown in the last decade. However, the tribological properties of hydrogels under physiologically relevant conditions, especially those of textured hydrogels, have remained largely unknown due to the complexity of their mechanical and chemical properties. In this study, we experimentally investigated the tribological properties of micopored poly(2-hydroxyethyl methacrylate) (pHEMA) with the lateral pore dimensions varied compared to untextured pHEMA, the most commonly used hydrogel in ophthalmology, under physiologically relevant conditions. The pHEMA specimens were slid against a smooth glass curve under varying loads (6-60 mN, leading to an average contact pressure of 10-21 kPa) and sliding speeds (1-10 mm/s) in phosphate-buffered saline (pH 7.4) at 33 °C to mimic the physiological conditions in human eyes. At relatively low loads and sliding speeds (e.g., 6 mN and 1 mm/s), the micopored pHEMA did not reduce the dissipated frictional energy significantly. However, at relatively high loads and sliding speeds (e.g., 60 mN and 100 mm/s), the micopored pHEMA resulted in significantly lower frictional energy (reduced by up to 68%) dissipation than the untextured pHEMA. The effect was more pronounced with the micropores with smaller dimensions. These are attributed to the greater amount and retentivity of the interfacial fluid supported by the free water squeezed out of the micropores with the smaller dimensions under the higher load and sliding speed. These results suggest that the use of micropore texturing on hydrogels in practice, such as for ocular applications, can be leveraged to reduce friction and wear under physiological conditions and hence lower the chance of inflammation near eye implants or keratoprosthesis.
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Affiliation(s)
- Yiwen Xi
- Department of Mechanical Engineering, Stevens Institute of Technology, Castle Point on Hudson, Hoboken, New Jersey 07030, United States
- Department of Biomedical Engineering (FB40), University of Groningen and University Medical Center Groningen, Antonius Deusinglaan 1, Groningen 9713AV, The Netherlands
| | - Prashant Kumar Sharma
- Department of Biomedical Engineering (FB40), University of Groningen and University Medical Center Groningen, Antonius Deusinglaan 1, Groningen 9713AV, The Netherlands
| | - Hans Jan Kaper
- Department of Biomedical Engineering (FB40), University of Groningen and University Medical Center Groningen, Antonius Deusinglaan 1, Groningen 9713AV, The Netherlands
| | - Chang-Hwan Choi
- Department of Mechanical Engineering, Stevens Institute of Technology, Castle Point on Hudson, Hoboken, New Jersey 07030, United States
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Chau AL, Rosas J, Degen GD, Månsson LK, Chen J, Valois E, Pitenis AA. Aqueous surface gels as low friction interfaces to mitigate implant-associated inflammation. J Mater Chem B 2020; 8:6782-6791. [PMID: 32364211 DOI: 10.1039/d0tb00582g] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Aqueous surface gels are fragile yet resilient biopolymer-based networks capable of sustaining extremely low friction coefficients despite tribologically-challenging environments. These superficial networks are ubiquitous in natural sliding interfaces and protect mechanosensitive cells from excessive contact pressures and frictional shear stresses from cell-fluid, cell-cell, or cell-solid interactions. Understanding these complex lubrication mechanisms may aid in the development of materials-based strategies for increasing biocompatibility in medical devices and implants. Equally as important is characterizing the interplay between soft and passive yet mobile implant materials and cellular reactions in response to direct contact and frictional shear stresses. Physically interrogating living biological systems without rupturing them in the process is nontrivial. To this end, custom biotribometers have been designed to precisely modulate contact pressures against living human telomerase-immortalized corneal epithelial (hTCEpi) cell layers using soft polyacrylamide membrane probes. Reverse-transcription quantitative polymerase chain-reaction (RT-qPCR) indicated that increased duration and, to a much greater extent, the magnitude of frictional shear stress lead to increased production of pro-inflammatory (IL-1β, IL-6, MMP9) and pro-apoptotic (DDIT3, FAS) genes, which in clinical studies are linked to pathological pain. The hierarchical structure often found in biological systems has also been investigated through the fabrication of high-water content (polyacrylamide) hydrogels through free-radical polymerization inhibition. Nanoindentation experiments and friction coefficient measurements indicate that these "gradient surface gels" reduce contact pressures and frictional shear stresses at the surface of the material while still maintaining stiffness within the bulk. Reducing frictional shear stresses through informed materials and surface design may concomitantly increase lubricity and quiet the immune response, and thus provide bio-inspired routes to improve patient outcomes and quality of life.
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Affiliation(s)
- Allison L Chau
- Materials Department University of California, Santa Barbara, CA 93106, USA.
| | - Jonah Rosas
- Biomolecular Science and Engineering Department University of California, Santa Barbara, CA 93106, USA
| | - George D Degen
- Department of Chemical Engineering, University of California, Santa Barbara Santa Barbara, CA 93106, USA
| | - Lisa K Månsson
- Department of Physics Chalmers, University of Technology, 412 58 Gothenburg, Sweden
| | - Jonathan Chen
- Department of Chemical Engineering, University of California, Santa Barbara Santa Barbara, CA 93106, USA
| | - Eric Valois
- Department of Molecular, Cellular, and Developmental Biology, University of California, Santa Barbara, CA 93106, USA
| | - Angela A Pitenis
- Materials Department University of California, Santa Barbara, CA 93106, USA.
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Vives CM, Pastoriza A. Poly(N-vinyl imidazole) hydrogels polymerized in molds of different materials. Eur Polym J 2015. [DOI: 10.1016/j.eurpolymj.2015.09.026] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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6
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Schmocker A, Khoushabi A, Schizas C, Bourban PE, Pioletti DP, Moser C. Miniature probe for the delivery and monitoring of a photopolymerizable material. JOURNAL OF BIOMEDICAL OPTICS 2015; 20:127001. [PMID: 26662066 DOI: 10.1117/1.jbo.20.12.127001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2015] [Accepted: 10/30/2015] [Indexed: 06/05/2023]
Abstract
Photopolymerization is a common method to cure materials initially in a liquid state, such as dental implants or bone or tissue fillers. Recent advances in the development of biocompatible gel- and cement-systems open up an avenue for in situ photopolymerization. For minimally invasive surgery, such procedures require miniaturized surgical endoscopic probes to activate and control photopolymerization in situ. We present a miniaturized light probe in which a photoactive material can be (1) mixed, pressurized, and injected, (2) photopolymerized/photoactivated, and (3) monitored during the chemical reaction. The device is used to implant and cure poly(ethylene glycol) dimethacrylate-hydrogel-precursor in situ with ultraviolet A (UVA) light (365 nm) while the polymerization reaction is monitored in real time by collecting the fluorescence and Raman signals generated by the 532-nm excitation light source. Hydrogels could be delivered, photopolymerized, and monitored by the probe up to a curing depth of 4 cm. The size of the photopolymerized samples could be correlated to the fluorescent signal collected by the probe, and the reproducibility of the procedure could be demonstrated. The position of the probe tip inside a bovine caudal intervertebral disc could be estimated in vitro based on the collected fluorescence and Raman signal.
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Affiliation(s)
- Andreas Schmocker
- Swiss Federal Institute of Technology Lausanne, Microengineering Institute, Laboratory of Applied Photonics Devices, Station 17, Lausanne 1015, SwitzerlandbSwiss Federal Institute of Technology Lausanne, Institute of Bioengineering, Laboratory of Biomecha
| | - Azadeh Khoushabi
- Swiss Federal Institute of Technology Lausanne, Institute of Bioengineering, Laboratory of Biomechanical Orthopedics, Station 19, Lausanne 1015, SwitzerlandcSwiss Federal Institute of Technology Lausanne, Institute of Materials, Laboratory of Polymer and
| | - Constantin Schizas
- Clinic Cecil, Neuro-orthopedic Spine Unit, Avenue Louis-Ruchonnet 53, Lausanne 1003, Switzerland
| | - Pierre-Etienne Bourban
- Swiss Federal Institute of Technology Lausanne, Institute of Materials, Laboratory of Polymer and Composite Technology, Station 12, Lausanne 1015, Switzerland
| | - Dominique P Pioletti
- Swiss Federal Institute of Technology Lausanne, Institute of Bioengineering, Laboratory of Biomechanical Orthopedics, Station 19, Lausanne 1015, Switzerland
| | - Christophe Moser
- Swiss Federal Institute of Technology Lausanne, Microengineering Institute, Laboratory of Applied Photonics Devices, Station 17, Lausanne 1015, Switzerland
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Sudre G, Hourdet D, Cousin F, Creton C, Tran Y. Structure of surfaces and interfaces of poly(N,N-dimethylacrylamide) hydrogels. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:12282-12287. [PMID: 22823739 DOI: 10.1021/la301417x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We investigated the surface structure of hydrogels of poly(N,N-dimethylacrylamide) (PDMA) hydrogels synthesized and cross-linked simultaneously by redox free radical polymerization. We demonstrate the existence of a less cross-linked layer at the surface of the gel at least at two different length scales characterized by shear rheology and by neutron reflectivity, suggesting the existence of a gradient in cross-linking. The composition of the layer is shown to depend on the degree of hydrophobicity of the mold surface and is weaker for more hydrophobic molds. While the macroscopic tests proved the existence of a relatively thick under-cross-linked layer, we also demonstrated by neutron reflectivity that the gel surface at the submicrometric scale (500 nm) was also affected by the surface treatment of the mold. These results should have important implications for the measurement of macroscopic surface properties of these hydrogels such as friction or adhesion.
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Affiliation(s)
- Guillaume Sudre
- Laboratoire de Sciences et Ingénierie de la Matière Molle, UMR 7615 CNRS/UPMC/ESPCI ParisTech, Paris, France
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Flores-Merino MV, Chirasatitsin S, LoPresti C, Reilly GC, Battaglia G, Engler AJ. Nanoscopic mechanical anisotropy in hydrogel surfaces. SOFT MATTER 2010; 6:4466-4470. [PMID: 20953281 PMCID: PMC2954611 DOI: 10.1039/c0sm00339e] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The bulk mechanical properties of soft materials have been studied widely, but it is unclear to what extent macroscopic behavior is reflected in nanomechanics. Using an atomic force microscopy (AFM) imaging method called force spectroscopy mapping (FSM), it is possible to map the nanoscopic spatial distribution of Young's modulus, i.e. "stiffness," and determine if soft or stiff polymer domains exist to correlate nano- and macro-mechanics. Two model hydrogel systems typically used in cell culture and polymerized by a free radical polymerization process, i.e. poly (vinyl pyrrolidone) (PVP) and poly(acrylamide) (PAam) hydrogels, were found to have significantly different nanomechanical behavior despite relatively similar bulk stiffness and roughness. PVP gels contained a large number of soft and stiff nanodomains, and their size was inversely related to crosslinking density and changes in crosslinking efficiency within the hydrogel. In contrast, PAam gels displayed small nanodomains occuring at low frequency, indicating relatively uniform polymerization. Given the responsiveness of cells to changes in gel stiffness, inhomogeneities found in the PVP network indicate that careful nanomechanical characterization of polymer substrates is necessary to appreciate complex cell behavior.
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Affiliation(s)
- Miriam V. Flores-Merino
- Department of Biomedical Science, University of Sheffield, Addison Building, Western Bank, Sheffield, S10 2TN, United Kingdom
- Biomaterials and Tissue Engineering Group, Department of Engineering Materials, The Kroto Research Institute, University of Sheffield, Broad Lane, Sheffield, S3 7HQ, United Kingdom
| | - Somyot Chirasatitsin
- Department of Bioengineering, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Caterina LoPresti
- Department of Biomedical Science, University of Sheffield, Addison Building, Western Bank, Sheffield, S10 2TN, United Kingdom
- Biomaterials and Tissue Engineering Group, Department of Engineering Materials, The Kroto Research Institute, University of Sheffield, Broad Lane, Sheffield, S3 7HQ, United Kingdom
| | - Gwendolen C. Reilly
- Biomaterials and Tissue Engineering Group, Department of Engineering Materials, The Kroto Research Institute, University of Sheffield, Broad Lane, Sheffield, S3 7HQ, United Kingdom
| | - Giuseppe Battaglia
- Department of Biomedical Science, University of Sheffield, Addison Building, Western Bank, Sheffield, S10 2TN, United Kingdom
| | - Adam J. Engler
- Department of Bioengineering, University of California, San Diego, La Jolla, CA, 92093, USA
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Lam H, Gong X, Wu C. Novel differential refractometry study of the enzymatic degradation kinetics of poly(ethylene oxide)-b-poly(epsilon-caprolactone) particles dispersed in water. J Phys Chem B 2007; 111:1531-5. [PMID: 17266357 DOI: 10.1021/jp066514n] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A poly(ethylene oxide)-b-poly(epsilon-caprolactone) (PEO-b-PCL) diblock copolymer was micronized into small micelle-like particles (approximately 80 nm) via dialysis-induced microphase inversion. The enzymatic biodegradation of the PCL portion of these particles in water was in situ investigated inside a recently developed novel differential refractometer. Using this refractometry method, we were able to monitor the real-time biodegradation via the refractive index change (Deltan) of the dispersion because Deltan is directly proportional to the particle mass concentration. We found that the degradation rate is proportional to either the polymer or enzyme concentration. Our results directly support previous speculation on the basis of the light-scattering data that the biodegradation follows the first-order kinetics for a given enzyme concentration. This study not only leads to a better understanding of the enzymatic biodegradation of PCL, but also demonstrates a novel, rapid, noninvasive, and convenient way to test the degradability of polymers.
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Affiliation(s)
- HiuFung Lam
- The Hefei National Laboratory for Physical Sciences at Microscale, The University of Science and Technology of China, Hefei, Anhui, 230026 China
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Peng M, Ping Gong J, Osada Y. Substrate effect on the formation of hydrogels with heterogeneous network structure. CHEM REC 2003; 3:40-50. [PMID: 12552530 DOI: 10.1002/tcr.10048] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
It was found that when an aqueous solution of vinyl monomers is polymerized on a hydrophobic substrate, obvious heterogeneity occurs in the region of the interface. This substrate effect was observed on polytetrafluroethylene (Teflon), polypropylene (PP), polyethylene (PE), polystyrene (PS), and polyvinylchloride (PVC), but not on hydrophilic substrates. Compared with synthesis on hydrophilic surfaces, the surfaces of hydrogels synthesized on a hydrophobic substrate exhibit a larger degree of swelling, a lower surface coefficient of friction and elastic modulus, weaker interfacial adhesion, and reduced interaction with biological cells. This substrate effect has been observed for many types of aqueous monomer solutions. It was found that the above properties are related to the loosely cross-linked architecture, containing some graft-like polymer chains, that is formed on the gel surface when the gel is prepared on a hydrophobic substrate. To understand the mechanism of the substrate effect, two novel optical methods, electric speckle pattern interferometry (ESPI) and real-time laser sheet refraction (RT-LSR), were developed. It was found that oxygen trapped in the composite interface between the monomer solution and rough hydrophobic substrates played an important role in the substrate effect.
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Affiliation(s)
- Mao Peng
- Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
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13
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Kurokawa T, Gong JP, Osada Y. Substrate Effect on Topographical, Elastic, and Frictional Properties of Hydrogels. Macromolecules 2002. [DOI: 10.1021/ma020453j] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- T. Kurokawa
- Graduate School of Science, Hokkaido University, and PRESTO, JST, Sapporo 060-0810 Japan
| | - J. P. Gong
- Graduate School of Science, Hokkaido University, and PRESTO, JST, Sapporo 060-0810 Japan
| | - Y. Osada
- Graduate School of Science, Hokkaido University, and PRESTO, JST, Sapporo 060-0810 Japan
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Peng M, Kurokawa T, Gong JP, Osada Y, Zheng Q. Effect of Surface Roughness of Hydrophobic Substrate on Heterogeneous Polymerization of Hydrogels. J Phys Chem B 2002. [DOI: 10.1021/jp012521u] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mao Peng
- Division of Biological Science, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan, and Department of Polymer Science & Engineering, Zhejiang University, Hangzhou 310027, China
| | - Takayuki Kurokawa
- Division of Biological Science, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan, and Department of Polymer Science & Engineering, Zhejiang University, Hangzhou 310027, China
| | - Jian Ping Gong
- Division of Biological Science, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan, and Department of Polymer Science & Engineering, Zhejiang University, Hangzhou 310027, China
| | - Yoshihito Osada
- Division of Biological Science, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan, and Department of Polymer Science & Engineering, Zhejiang University, Hangzhou 310027, China
| | - Qiang Zheng
- Division of Biological Science, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan, and Department of Polymer Science & Engineering, Zhejiang University, Hangzhou 310027, China
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16
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Weng L, Zhou X, Zhang X, Xu J, Zhang L. In situ monitoring gelation process of N,N-dimethylacrylamide by refractive index technique. POLYMER 2002. [DOI: 10.1016/s0032-3861(02)00642-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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17
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Peng M, Gong JP, Osada Y, Zhang X, Zheng Q. Real-Time Laser Sheet Refraction To Monitor in Situ the Heterogeneity of Polymerization Process on Teflon Surface. Macromolecules 2001. [DOI: 10.1021/ma0104027] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Mao Peng
- Division of Biological Science, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan; Department of Polymer Science & Engineering, Zhejiang University, Hangzhou 310027, China; and Department of Information and Electronic Engineering, Zhejiang University, Hangzhou 310027, China
| | - Jian Ping Gong
- Division of Biological Science, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan; Department of Polymer Science & Engineering, Zhejiang University, Hangzhou 310027, China; and Department of Information and Electronic Engineering, Zhejiang University, Hangzhou 310027, China
| | - Yoshihito Osada
- Division of Biological Science, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan; Department of Polymer Science & Engineering, Zhejiang University, Hangzhou 310027, China; and Department of Information and Electronic Engineering, Zhejiang University, Hangzhou 310027, China
| | - Xianming Zhang
- Division of Biological Science, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan; Department of Polymer Science & Engineering, Zhejiang University, Hangzhou 310027, China; and Department of Information and Electronic Engineering, Zhejiang University, Hangzhou 310027, China
| | - Qiang Zheng
- Division of Biological Science, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan; Department of Polymer Science & Engineering, Zhejiang University, Hangzhou 310027, China; and Department of Information and Electronic Engineering, Zhejiang University, Hangzhou 310027, China
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Narita T, Knaebel A, Munch JP, Candau SJ, Gong JP, Osada Y. Microrheological Investigation of Substrate-Induced Gradient Structure in Hydrogels. Macromolecules 2001. [DOI: 10.1021/ma010364r] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tetsuharu Narita
- Laboratoire de Dynamique des Fluides Complexes, 3, rue de l'Université, 67084 Strasbourg, France, and Graduate School of Science, Hokkaido University, 060-0810 Sapporo, Japan
| | - Alexandra Knaebel
- Laboratoire de Dynamique des Fluides Complexes, 3, rue de l'Université, 67084 Strasbourg, France, and Graduate School of Science, Hokkaido University, 060-0810 Sapporo, Japan
| | - Jean-Pierre Munch
- Laboratoire de Dynamique des Fluides Complexes, 3, rue de l'Université, 67084 Strasbourg, France, and Graduate School of Science, Hokkaido University, 060-0810 Sapporo, Japan
| | - Sanveur Jean Candau
- Laboratoire de Dynamique des Fluides Complexes, 3, rue de l'Université, 67084 Strasbourg, France, and Graduate School of Science, Hokkaido University, 060-0810 Sapporo, Japan
| | - Jian Ping Gong
- Laboratoire de Dynamique des Fluides Complexes, 3, rue de l'Université, 67084 Strasbourg, France, and Graduate School of Science, Hokkaido University, 060-0810 Sapporo, Japan
| | - Yoshihito Osada
- Laboratoire de Dynamique des Fluides Complexes, 3, rue de l'Université, 67084 Strasbourg, France, and Graduate School of Science, Hokkaido University, 060-0810 Sapporo, Japan
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Gong JP, Kurokawa T, Narita T, Kagata G, Osada Y, Nishimura G, Kinjo M. Synthesis of hydrogels with extremely low surface friction. J Am Chem Soc 2001; 123:5582-3. [PMID: 11389644 DOI: 10.1021/ja003794q] [Citation(s) in RCA: 130] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Gong JP, Kii A, Xu J, Hattori Y, Osada Y. A Possible Mechanism for the Substrate Effect on Hydrogel Formation. J Phys Chem B 2001. [DOI: 10.1021/jp003244e] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jian Ping Gong
- Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Akishige Kii
- Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Jan Xu
- Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Yoshihiko Hattori
- Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Yoshihito Osada
- Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
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Kii A, Xu J, Gong JP, Osada Y, Zhang X. Heterogeneous Polymerization of Hydrogels on Hydrophobic Substrate. J Phys Chem B 2001. [DOI: 10.1021/jp003242u] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Akishige Kii
- Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Jian Xu
- Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Jian Ping Gong
- Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Yoshihito Osada
- Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Xianmin Zhang
- Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
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Narita T, Hirai A, Xu J, Gong JP, Osada Y. Substrate effects of gel surfaces on cell adhesion and disruption. Biomacromolecules 2000; 1:162-7. [PMID: 11710095 DOI: 10.1021/bm9900085] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Substrate effects of hydrogel surfaces prepared on hydrophilic and hydrophobic substrates on the cell adhesion and disruption were studied. The adhesion of tobacco protoplasts onto anionic hydrogels was strongly influenced by the substrates on which the gels were synthesized. In the case of anionic poly(2-acrylamido-2-methylpropanesulfonic acid) gel, more cells adhered on the gel surface prepared on hydrophobic substrates than that prepared on hydrophilic substrates. On the other hand, in the case of cationic quaternized poly-(dimethylaminopropylacrylamide) gel, cell disruption occurred in a few seconds accompanied with an intensive release of cellular contents on the gel surface prepared on the hydrophilic substrates, while the cationic gel synthesized on hydrophobic substrates induced no cell disruption. These different behaviors of the cell have been made in terms of different structures of gel surfaces associated with the presence of flexible dangling chains.
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