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Rummaneethorn P, Lee D. Dielectric charge injection (DCI)-enabled contactless droplet wetting modulation for droplet-surface material interchange. J Colloid Interface Sci 2023; 639:241-248. [PMID: 36805749 DOI: 10.1016/j.jcis.2023.02.017] [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: 11/29/2022] [Revised: 01/27/2023] [Accepted: 02/02/2023] [Indexed: 02/08/2023]
Abstract
HYPOTHESIS Electrowetting-on-dielectric (EWOD) employs direct droplet-electrode contact to generate electric fields across the dielectric layer to modulate droplet wetting. Because the charged surface state drives this process, it should be possible to accomplish a contactless modulation of droplet wetting by charge injection onto the dielectric surface where a droplet is situated. EXPERIMENTS We present our technique, dielectric charge injection (DCI), to contactlessly modulate droplet wetting via corona discharge-based physics. We study the ability of droplets on nonwetting surfaces to transition to a wetting state under DCI, quantify contact angle (CA) in relation to applied voltage, and examine reversibility under regimes with and without charge injection. The observed phenomena are applied to enable droplet-surface material interchange. FINDINGS Using DCI, we induce wetting of a deionized water droplet on a non-wetting polydimethylsiloxane (PDMS) surface immersed in hexadecane, with tunable CA modulation based on applied voltage. Upon simple removal of the voltage and/or conductor, droplet fully recovers the initial non-wetting state. We combine these capabilities to enable droplet-surface material interchange of two modes: material deposition (droplet-to-surface) and material recovery (surface-to-droplet). DCI presents a unique strategy for contactless, reversible wetting state modulation that is simple yet powerful for applications such as integrating droplet microfluidics to mass spectrometry.
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Affiliation(s)
- Paradorn Rummaneethorn
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, 311A Towne Building, 220 South 33(rd) Street, Philadelphia, PA 19104, USA.
| | - Daeyeon Lee
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, 311A Towne Building, 220 South 33(rd) Street, Philadelphia, PA 19104, USA.
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Li L, Westerbeek EY, Vollenbroek JC, de Beer S, Shui L, Odijk M, Eijkel JCT. Autonomous capillary microfluidic devices with constant flow rate and temperature-controlled valving. SOFT MATTER 2021; 17:7781-7791. [PMID: 34351350 DOI: 10.1039/d1sm00625h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
In this paper, we report on a capillary microfluidic device with constant flow rate and temperature-triggered stop valve function. It contains a PDMS channel that was grafted by a thermo-responsive polymer poly(N-isopropylacrylamide) (PNIPAm). The channel exhibits a constant capillary filling speed. By locally increasing the temperature in the channel from 20 °C to 37 °C using a microfabricated heater, a change of the surface wettability from hydrophilic to hydrophobic is obtained creating a hydrophobic stop valve. The valve can be reopened by lowering the temperature. The device is simple to fabricate and can be used as an actuatable capillary pump operating around room temperature. To understand the constant capillary filling speed, we performed contact angle measurements, in which we found slow wetting kinetics of PNIPAm-g-PDMS surfaces at temperatures below the lower critical solution temperature (LCST) of PNIPAm and fast wetting kinetics above the LCST. We interpret this as the result of the diffusive hydration process of PNIPAm below the LCST and the absence of hydration on the hydrophobic PNIPAm thin layer above the LCST.
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Affiliation(s)
- Lanhui Li
- National Center for International Research on Green Optoelectronics & South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China.
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Bauman L, Wen Q, Sameoto D, Yap CH, Zhao B. Durable poly(N-isopropylacrylamide) grafted PDMS micropillared surfaces for temperature-modulated wetting. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2020.125901] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Zeng W, Huang Y, Xia A, Liao Q, Chen K, Zhu X, Zhu X. Thermoresponsive Surfaces Grafted by Shrinkable Hydrogel Poly( N-isopropylacrylamide) for Controlling Microalgae Cells Adhesion during Biofilm Cultivation. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:1178-1189. [PMID: 33403849 DOI: 10.1021/acs.est.0c03084] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Microalgae is a promising candidate for reducing greenhouse gas and producing renewable biofuels. For microalgae biofilm cultivation, a strong adhesion ability of microalgae cells onto the surface is a prerequisite to resist the fluid shear stress, while strong adhesion is not of benefit to the biofilm harvesting process. To solve this dilemma, a thermoresponsive surface (TMRS) with lower critical solution temperature of 33 °C was made by grafting N-isopropylacrylamide onto a silicate glass slide. The wettability of the TMRS changed from hydrophilic (contact angle of 59.4°) to hydrophobic (contact angle of 91.6°) when the temperature rose from 15 to 35 °C, resulting in the increase of adhesion energy of the TMRS to Chlorella vulgaris cells by 135.6%. The experiments showed that the cells were more likely to attach onto the TMRS at the higher temperature of 35 °C owing to the surface microstructures generated by the hydrogel layer shrinkage, which is similar in size to the microalgae cells. And the cell coverage rate on TMRS increased by 32% compared to the original glass surface. Conversely, the cells separate easily from the TMRS at a lower temperature of 15 °C, and the cell adhesion density was reduced by 19% due to hydrogel layer swelling to a relatively flat surface.
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Affiliation(s)
- Weida Zeng
- Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, P. R. China
- Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, P. R. China
| | - Yun Huang
- Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, P. R. China
- Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, P. R. China
| | - Ao Xia
- Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, P. R. China
- Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, P. R. China
| | - Qiang Liao
- Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, P. R. China
- Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, P. R. China
| | - Keming Chen
- Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, P. R. China
- Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, P. R. China
| | - Xun Zhu
- Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, P. R. China
- Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, P. R. China
| | - Xianqing Zhu
- Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, P. R. China
- Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, P. R. China
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Fragal VH, Catori DM, Fragal EH, Garcia FP, Nakamura CV, Rubira AF, Silva R. Two-dimensional thermoresponsive sub-microporous substrate for accelerated cell tissue growth and facile detachment. J Colloid Interface Sci 2019; 547:78-86. [DOI: 10.1016/j.jcis.2019.03.071] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Revised: 03/21/2019] [Accepted: 03/22/2019] [Indexed: 11/27/2022]
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Li L, Yan Z, Jin M, You X, Xie S, Liu Z, van den Berg A, Eijkel JCT, Shui L. In-Channel Responsive Surface Wettability for Reversible and Multiform Emulsion Droplet Preparation and Applications. ACS APPLIED MATERIALS & INTERFACES 2019; 11:16934-16943. [PMID: 30983312 DOI: 10.1021/acsami.9b03160] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We report on a simple approach for in-channel functionalization of a polydimethylsiloxane (PDMS) surface to obtain a switchable and reversible wettability change between hydrophilic and hydrophobic states. The thermally responsive polymer, poly( N-Isopropylacrylamide) (PNIPAAm), was grafted on the surface of PDMS channels by UV-induced surface grafting. PNIPAAm-grafted PDMS (PNIPAAm-g-PDMS) surface wettability can be thermally tuned to obtain water contact angles varying in the range of 24.3 to 106.1° by varying temperature at 25-38 °C. By selectively modifying the functionalized area in the microfluidic channels, multiform emulsion droplets of oil-in-water (O/W), water-in-oil (W/O), oil-in-water-in-oil (O/W/O), and water-in-oil-in-water (W/O/W) could be created on-demand. Combining solid surface wettability and liquid-liquid interfacial properties, tunable generation of O/W and W/O droplet and stratified flows were enabled in the same microfluidic device with either different or the same two-phase fluidic systems, by properly heating/cooling thermal-responsive microfluidic channels and choosing suitable surfactants. Controllable creation of O/W/O and W/O/W droplets was also achieved in the same microfluidic device, by locally heating or cooling the droplet generation areas with integrated electric heaters to achieve opposite surface wettability. Hollow microcapsules were prepared using double emulsion droplets as templates in the microfluidic device with sequential hydrophobic and hydrophilic channel segments, demonstrating the strength of the proposed approach in practical applications.
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Affiliation(s)
- Lanhui Li
- BIOS/Lab on a Chip Group, MESA+ Institute for Nanotechnology , University of Twente , Enschede 7500AE , The Netherlands
| | | | | | | | | | | | - Albert van den Berg
- BIOS/Lab on a Chip Group, MESA+ Institute for Nanotechnology , University of Twente , Enschede 7500AE , The Netherlands
| | - Jan C T Eijkel
- BIOS/Lab on a Chip Group, MESA+ Institute for Nanotechnology , University of Twente , Enschede 7500AE , The Netherlands
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7
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Geng H, Zhou K, Zhou J, Ma H, Lv C, Li C, Xu Z, Qu L. Sunlight‐Driven Water Transport via a Reconfigurable Pump. Angew Chem Int Ed Engl 2018; 57:15435-15440. [DOI: 10.1002/anie.201808835] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Indexed: 12/22/2022]
Affiliation(s)
- Hongya Geng
- Department of Chemistry, MOE Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical BiologyTsinghua University Beijing 100084 P. R. China
| | - Ke Zhou
- Applied Mechanics Laboratory, Department of Engineering Mechanics and Center for Nano and Micro MechanicsTsinghua University Beijing 100084 P. R. China
| | - Jiajia Zhou
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of EducationSchool of ChemistryBeihang University Beijing 100191 P. R. China
- Centre of Soft Matter Physics and Its ApplicationsBeihang University Beijing 100191 P. R. China
| | - Hongyun Ma
- Department of Chemistry, MOE Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical BiologyTsinghua University Beijing 100084 P. R. China
| | - Cunjing Lv
- Applied Mechanics Laboratory, Department of Engineering Mechanics and Center for Nano and Micro MechanicsTsinghua University Beijing 100084 P. R. China
| | - Chun Li
- Department of Chemistry, MOE Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical BiologyTsinghua University Beijing 100084 P. R. China
| | - Zhiping Xu
- Applied Mechanics Laboratory, Department of Engineering Mechanics and Center for Nano and Micro MechanicsTsinghua University Beijing 100084 P. R. China
| | - Liangti Qu
- Department of Chemistry, MOE Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical BiologyTsinghua University Beijing 100084 P. R. China
- Key Laboratory for Advanced Materials Processing TechnologyMinistry of Education of ChinaState Key Laboratory of TribologyDepartment of Mechanical EngineeringTsinghua University Beijing 100084 P. R. China
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8
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Geng H, Zhou K, Zhou J, Ma H, Lv C, Li C, Xu Z, Qu L. Sunlight‐Driven Water Transport via a Reconfigurable Pump. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201808835] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Hongya Geng
- Department of Chemistry, MOE Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical BiologyTsinghua University Beijing 100084 P. R. China
| | - Ke Zhou
- Applied Mechanics Laboratory, Department of Engineering Mechanics and Center for Nano and Micro MechanicsTsinghua University Beijing 100084 P. R. China
| | - Jiajia Zhou
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of EducationSchool of ChemistryBeihang University Beijing 100191 P. R. China
- Centre of Soft Matter Physics and Its ApplicationsBeihang University Beijing 100191 P. R. China
| | - Hongyun Ma
- Department of Chemistry, MOE Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical BiologyTsinghua University Beijing 100084 P. R. China
| | - Cunjing Lv
- Applied Mechanics Laboratory, Department of Engineering Mechanics and Center for Nano and Micro MechanicsTsinghua University Beijing 100084 P. R. China
| | - Chun Li
- Department of Chemistry, MOE Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical BiologyTsinghua University Beijing 100084 P. R. China
| | - Zhiping Xu
- Applied Mechanics Laboratory, Department of Engineering Mechanics and Center for Nano and Micro MechanicsTsinghua University Beijing 100084 P. R. China
| | - Liangti Qu
- Department of Chemistry, MOE Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical BiologyTsinghua University Beijing 100084 P. R. China
- Key Laboratory for Advanced Materials Processing TechnologyMinistry of Education of ChinaState Key Laboratory of TribologyDepartment of Mechanical EngineeringTsinghua University Beijing 100084 P. R. China
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9
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Avadanei M. Photografted polymeric networks based on N
-isopropylacrylamide: Depth profiling by infrared spectroscopy. J Appl Polym Sci 2018. [DOI: 10.1002/app.46048] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Mihaela Avadanei
- “P.Poni” Institute of Macromolecular Chemistry; 41A Gr. Ghica Voda Alley 700487 Iasi, Romania
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10
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Banuprasad TN, Vinay TV, Subash CK, Varghese S, George SD, Varanakkottu SN. Fast Transport of Water Droplets over a Thermo-Switchable Surface Using Rewritable Wettability Gradient. ACS APPLIED MATERIALS & INTERFACES 2017; 9:28046-28054. [PMID: 28750164 DOI: 10.1021/acsami.7b07451] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
In spite of the reported temperature dependent tunability in wettability of poly(N-isopropylacrylamide) (PNIPAAm) surfaces for below and above lower critical solution temperature (32 °C), the transport of water droplets is inhibited by the large contact angle hysteresis. Herein, for the first time, we report on-demand, fast, and reconfigurable droplet manipulation over a PNIPAAm grafted structured polymer surface using temperature-induced wettability gradient. Our study reveals that the PNIPAAm grafted on intrinsically superhydrophobic surfaces exhibit hydrophilic nature with high contact angle hysteresis below 30 °C and superhydrophobic nature with ultralow contact angle hysteresis above 36 °C. The transition region between 30 and 36 °C is characterized by a large change in water contact angle (∼100°) with a concomitant change in contact angle hysteresis. By utilizing this "transport zone" wherein driving forces overcome the frictional forces, we demonstrate macroscopic transport of water drops with a maximum transport velocity of approximately 40 cm/s. The theoretical calculations on the force measurements concur with dominating behavior of driving forces across the transport zone. The tunability in transport velocity by varying the temperature gradient along the surface or the inclination angle of the surface (maximum angle of 15° with a reduced velocity 0.4 mm/s) is also elucidated. In addition, as a practical application, coalescence of water droplets is demonstrated by using the temperature controlled wettability gradient. The presented results are expected to provide new insights on the design and fabrication of smart multifunctional surfaces for applications such as biochemical analysis, self-cleaning, and microfluidics.
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Affiliation(s)
| | | | | | - Soney Varghese
- School of Nano Science and Technology, National Institute of Technology , Calicut 673 601, India
| | - Sajan D George
- Centre for Applied Nanosciences, Department of Atomic and Molecular Physics, Manipal University , Karnataka 576 104, India
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11
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Backman DE, LeSavage BL, Shah SB, Wong JY. A Robust Method to Generate Mechanically Anisotropic Vascular Smooth Muscle Cell Sheets for Vascular Tissue Engineering. Macromol Biosci 2017; 17:10.1002/mabi.201600434. [PMID: 28207187 PMCID: PMC5568633 DOI: 10.1002/mabi.201600434] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Revised: 12/22/2016] [Indexed: 12/11/2022]
Abstract
In arterial tissue engineering, mimicking native structure and mechanical properties is essential because compliance mismatch can lead to graft failure and further disease. With bottom-up tissue engineering approaches, designing tissue components with proper microscale mechanical properties is crucial to achieve the necessary macroscale properties in the final implant. This study develops a thermoresponsive cell culture platform for growing aligned vascular smooth muscle cell (VSMC) sheets by photografting N-isopropylacrylamide (NIPAAm) onto micropatterned poly(dimethysiloxane) (PDMS). The grafting process is experimentally and computationally optimized to produce PNIPAAm-PDMS substrates optimal for VSMC attachment. To allow long-term VSMC sheet culture and increase the rate of VSMC sheet formation, PNIPAAm-PDMS surfaces were further modified with 3-aminopropyltriethoxysilane yielding a robust, thermoresponsive cell culture platform for culturing VSMC sheets. VSMC cell sheets cultured on patterned thermoresponsive substrates exhibit cellular and collagen alignment in the direction of the micropattern. Mechanical characterization of patterned, single-layer VSMC sheets reveals increased stiffness in the aligned direction compared to the perpendicular direction whereas nonpatterned cell sheets exhibit no directional dependence. Structural and mechanical anisotropy of aligned, single-layer VSMC sheets makes this platform an attractive microstructural building block for engineering a vascular graft to match the in vivo mechanical properties of native arterial tissue.
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Affiliation(s)
- Daniel E Backman
- Department of Biomedical Engineering, Boston University, 44 Cummington Mall, Boston, MA, 02215, USA
| | - Bauer L LeSavage
- Department of Biomedical Engineering, Boston University, 44 Cummington Mall, Boston, MA, 02215, USA
| | - Shivem B Shah
- Department of Biomedical Engineering, Boston University, 44 Cummington Mall, Boston, MA, 02215, USA
| | - Joyce Y Wong
- Department of Biomedical Engineering, Boston University, 44 Cummington Mall, Boston, MA, 02215, USA
- Division of Materials Science and Engineering, Boston University, 15 Saint Mary's Street, Boston, MA, 02215, USA
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12
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Cook MT, Filippov SK, Khutoryanskiy VV. Synthesis and solution properties of a temperature-responsive PNIPAM–b-PDMS–b-PNIPAM triblock copolymer. Colloid Polym Sci 2017. [DOI: 10.1007/s00396-017-4084-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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13
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Laing S, Suriano R, Lamprou DA, Smith CA, Dalby MJ, Mabbott S, Faulds K, Graham D. Thermoresponsive Polymer Micropatterns Fabricated by Dip-Pen Nanolithography for a Highly Controllable Substrate with Potential Cellular Applications. ACS APPLIED MATERIALS & INTERFACES 2016; 8:24844-52. [PMID: 27572916 DOI: 10.1021/acsami.6b03860] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
We report a novel approach for patterning thermoresponsive hydrogels based on N,N-diethylacrylamide (DEAAm) and bifunctional Jeffamine ED-600 by dip-pen nanolithography (DPN). The direct writing of micron-sized thermoresponsive polymer spots was achieved with efficient control over feature size. A Jeffamine-based ink prepared through the combination of organic polymers, such as DEAAm, in an inorganic silica network was used to print thermosensitive arrays on a thiol-silanized silicon oxide substrate. The use of a Jeffamine hydrogel, acting as a carrier matrix, allowed a reduction in the evaporation of ink molecules with high volatility, such as DEAAm, and facilitated the transfer of ink from tip to substrate. The thermoresponsive behavior of polymer arrays which swell/deswell in aqueous solution in response to a change in temperature was successfully characterized by atomic force microscopy (AFM) and Raman spectroscopy: a thermally induced change in height and hydration state was observed, respectively. Finally, we demonstrate that cells can adhere to and interact with these dynamic features and exhibit a change in behavior when cultured on the substrates above and below the transition temperature of the Jeffamine/DEAAm thermoresponsive hydrogels. This demonstrates the potential of these micropatterned hydrogels to act as a controllable surface for cell growth.
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Affiliation(s)
- Stacey Laing
- Centre for Molecular Nanometrology, Department of Pure and Applied Chemistry, Technology and Innovation Centre, University of Strathclyde , 99 George Street, Glasgow G1 1RD, United Kingdom
| | - Raffaella Suriano
- Department of Chemistry, Materials, and Chemical Engineering "Giulio Natta", Politecnico di Milano , Piazza Leonardo da Vinci 32, 20133 Milano, Italy
| | - Dimitrios A Lamprou
- Strathclyde Institute of Pharmacy and Biomedical Sciences (SIPBS), University of Strathclyde , 161 Cathedral Street, Glasgow G4 0RE, United Kingdom
- EPSRC Centre for Innovative Manufacturing in Continuous Manufacturing and Crystallization (CMAC), University of Strathclyde, Technology, and Innovation Centre , 99 George Street, Glasgow G1 1RD, United Kingdom
| | - Carol-Anne Smith
- Centre for Cell Engineering, Institute for Molecular, Cell, and Systems Biology, University of Glasgow , Glasgow G12 8LT, United Kingdom
| | - Matthew J Dalby
- Centre for Cell Engineering, Institute for Molecular, Cell, and Systems Biology, University of Glasgow , Glasgow G12 8LT, United Kingdom
| | - Samuel Mabbott
- Centre for Molecular Nanometrology, Department of Pure and Applied Chemistry, Technology and Innovation Centre, University of Strathclyde , 99 George Street, Glasgow G1 1RD, United Kingdom
| | - Karen Faulds
- Centre for Molecular Nanometrology, Department of Pure and Applied Chemistry, Technology and Innovation Centre, University of Strathclyde , 99 George Street, Glasgow G1 1RD, United Kingdom
| | - Duncan Graham
- Centre for Molecular Nanometrology, Department of Pure and Applied Chemistry, Technology and Innovation Centre, University of Strathclyde , 99 George Street, Glasgow G1 1RD, United Kingdom
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Man Y, Peng G, Wang J, Lv X, Deng Y. Microfluidic chip with thermoresponsive boronate affinity for the capture-release ofcis-diol biomolecules. J Sep Sci 2014; 38:339-45. [DOI: 10.1002/jssc.201400725] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2014] [Revised: 09/05/2014] [Accepted: 10/27/2014] [Indexed: 01/18/2023]
Affiliation(s)
- Yan Man
- School of Life Science; Beijing Institute of Technology; Beijing China
| | - Guang Peng
- School of Life Science; Beijing Institute of Technology; Beijing China
| | - Jianshe Wang
- School of Life Science; Beijing Institute of Technology; Beijing China
| | - Xuefei Lv
- School of Life Science; Beijing Institute of Technology; Beijing China
| | - Yulin Deng
- School of Life Science; Beijing Institute of Technology; Beijing China
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15
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Hao N, Li JY, Xiong M, Xia XH, Xu JJ, Chen HY. Remote control of reversible localized protein adsorption in microfluidic devices. ACS APPLIED MATERIALS & INTERFACES 2014; 6:11869-11873. [PMID: 25068799 DOI: 10.1021/am5039938] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We present a facilely prepared graphene oxide (GO)/ poly(dimethylsiloxane) (PDMS) composite by dispersing nanosized GO in PDMS. On the basis of the combination of photothermal effects of GO and grafted thermoresponsive polymer, poly(N-isopropylacrylamide) (PNIPAAm), an optical-driving approach for remote control of localized wettability is realized. And this method has been successfully applied in the spatially controlled reversible protein adsorption in microfluidic devices.
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Affiliation(s)
- Nan Hao
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University , Nanjing 210093, China
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Letrozole dispersed on poly (vinyl alcohol) anchored maleic anhydride grafted low density polyethylene: A controlled drug delivery system for treatment of breast cancer. Colloids Surf B Biointerfaces 2014; 116:169-75. [DOI: 10.1016/j.colsurfb.2013.12.040] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2013] [Revised: 12/12/2013] [Accepted: 12/19/2013] [Indexed: 11/19/2022]
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Akiyama Y, Yamato M, Okano T. Preparation of Poly(N-isopropylacrylamide) Grafted Polydimethylsiloxane by Using Electron Beam Irradiation. JOURNAL OF ROBOTICS AND MECHATRONICS 2013. [DOI: 10.20965/jrm.2013.p0631] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
A poly(N-isopropylacrylamide) (PIPAAm) grafted poly(dimethylsiloxane) (PDMS) surface was prepared as a temperature-responsive cell culture surface by using electron beam (EB) irradiation. Different chemical treatments to modify the bare PDMS surface were investigated for subsequent grafting of PIPAAm, and treatment conditions were optimized to prepare the temperature-responsive cell culture surface. The PDMS surface was initially activated to form silanol groups with conventional O2 plasma or hydrochloric acid (HCl) treatment. Activated PDMS surfaces were individually immobilized with three different conventional silane compounds, i.e., 3-mercaptopropyltrimethoxysilane (MerTMS), 3-methacryloxypropyltrimethoxysilane (MetTMS), and 3-aminopropyltrimethoxysilane (AmiTMS). O2 plasma treatment made PDMS more hydrophilic. In contrast, PDMS surfaces activated with HCl treatment were relatively hydrophobic. Observation of the activated PDMS surface modified with MerTMS, MetTMS, and AmiTMS indicated that these silane compounds had been favorably immobilized on plasma-treated PDMS surfaces. FT-IR/ATR analysis demonstrated that immobilized silane compounds enabled PIPAAm grafting on the PDMS surface. Cell attachment and detachment analysis also suggested that the PDMS surface sequentially treated with O2 plasma and AmiTMS compound was a substrate appropriate for preparing a temperature-responsive cell culture surface by EB irradiation-induced PIPAAm grafting method. The intelligent surface may further be applied to mechanically stretchable temperature-responsive cell culture surfaces.
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Muñoz-Muñoz F, Ruiz JC, Alvarez-Lorenzo C, Concheiro A, Bucio E. Temperature- and pH-sensitive interpenetrating polymer networks grafted on PP: Cross-linking irradiation dose as a critical variable for the performance as vancomycin-eluting systems. Radiat Phys Chem Oxf Engl 1993 2012. [DOI: 10.1016/j.radphyschem.2012.01.007] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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19
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Cao Q, Zuo C, Li L, Zhang Y, Yan G. Electro-osmotic flow in nanochannels with voltage-controlled polyelectrolyte brushes: Dependence on grafting density and normal electric field. ACTA ACUST UNITED AC 2012. [DOI: 10.1002/polb.23069] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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20
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Thermo-responsive poly(N-isopropylacrylamide) grafted onto microtextured poly(dimethylsiloxane) for aligned cell sheet engineering. Colloids Surf B Biointerfaces 2011; 99:108-15. [PMID: 22088757 DOI: 10.1016/j.colsurfb.2011.10.040] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2011] [Revised: 10/19/2011] [Accepted: 10/20/2011] [Indexed: 11/22/2022]
Abstract
Poly(N-isopropylacrylamide) (PNIPAAm)-grafted poly(dimethylsiloxane) (PDMS) offers an inexpensive, biocompatible, oxygen permeable, and easily microtextured thermo-responsive substrate for producing cell sheets. This study introduces a method of grafting PNIPAAm onto microtextured PDMS that is suitable for generating aligned vascular smooth muscle cell (VSMC) sheets. We examined a wide range of processing parameters in order to identify the conditions that led to acceptable sheet growth and detachment behavior. Substrates grafted under these conditions produced confluent cell sheets that fully detached in less than 10 min after lowering the culture temperature from 37 °C to 20 °C. The grafted layer thickness was determined to be 496±8 nm by atomic force microscopy. Surface characterization by Fourier transform infrared spectroscopy showed a relative grafting yield of 0.488±0.10, defined as the ratio of the PNIPAAm 1647 cm(-1) to the PDMS 2962 cm(-1) absorbance peaks. The water contact angle of the substrates was shown to change from 89.6° to 101.0° at 20 °C and 37 °C, respectively. We also found that cell behavior on PNIPAAm-grafted PDMS was not directly related to surface wettability or relative grafting densities.
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21
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Chemically amplified photoresist for high resolution autoradiography in targeted radiotherapy. Biomaterials 2011; 32:6138-44. [DOI: 10.1016/j.biomaterials.2011.05.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2011] [Accepted: 05/01/2011] [Indexed: 11/17/2022]
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22
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Tekin H, Ozaydin-Ince G, Tsinman T, Gleason KK, Langer R, Khademhosseini A, Demirel MC. Responsive microgrooves for the formation of harvestable tissue constructs. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:5671-9. [PMID: 21449596 PMCID: PMC3098811 DOI: 10.1021/la200183x] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Given its biocompatibility, elasticity, and gas permeability, poly(dimethylsiloxane) (PDMS) is widely used to fabricate microgrooves and microfluidic devices for three-dimensional (3D) cell culture studies. However, conformal coating of complex PDMS devices prepared by standard microfabrication techniques with desired chemical functionality is challenging. This study describes the conformal coating of PDMS microgrooves with poly(N-isopropylacrylamide) (PNIPAAm) by using initiated chemical vapor deposition (iCVD). These microgrooves guided the formation of tissue constructs from NIH-3T3 fibroblasts that could be retrieved by the temperature-dependent swelling property and hydrophilicity change of the PNIPAAm. The thickness of swollen PNIPAAm films at 24 °C was approximately 3 times greater than at 37 °C. Furthermore, PNIPAAm-coated microgroove surfaces exhibit increased hydrophilicity at 24 °C (contact angle θ = 30° ± 2) compared to 37 °C (θ = 50° ± 1). Thus PNIPAAm film on the microgrooves exhibits responsive swelling with higher hydrophilicity at room temperature, which could be used to retrieve tissue constructs. The resulting tissue constructs were the same size as the grooves and could be used as modules in tissue fabrication. Given its ability to form and retrieve cell aggregates and its integration with standard microfabrication, PNIPAAm-coated PDMS templates may become useful for 3D cell culture applications in tissue engineering and drug discovery.
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Affiliation(s)
- Halil Tekin
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
- Department of Medicine, Center for Biomedical Engineering, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Building 76-661, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
| | - Gozde Ozaydin-Ince
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
| | - Tonia Tsinman
- Department of Medicine, Center for Biomedical Engineering, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Karen K. Gleason
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
| | - Robert Langer
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Building 76-661, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- Prof. Melik C. Demirel - Corresponding-Author (), Prof. Ali Khademhosseini - Corresponding-Author (), Prof. Robert Langer - Corresponding-Author ()
| | - Ali Khademhosseini
- Department of Medicine, Center for Biomedical Engineering, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- Wyss Institute for Biologically Inspired Engineering, Harvard Medical School, Boston, MA, 02138
- Prof. Melik C. Demirel - Corresponding-Author (), Prof. Ali Khademhosseini - Corresponding-Author (), Prof. Robert Langer - Corresponding-Author ()
| | - Melik C. Demirel
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
- Wyss Institute for Biologically Inspired Engineering, Harvard Medical School, Boston, MA, 02138
- Materials Research Institute and Department of Engineering Science, Pennsylvania State University, University Park, PA 16802
- Prof. Melik C. Demirel - Corresponding-Author (), Prof. Ali Khademhosseini - Corresponding-Author (), Prof. Robert Langer - Corresponding-Author ()
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23
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Sun T, Qing G. Biomimetic smart interface materials for biological applications. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2011; 23:H57-H77. [PMID: 21433103 DOI: 10.1002/adma.201004326] [Citation(s) in RCA: 165] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Controlling the surface chemical and physical properties of materials and modulating the interfacial behaviors of biological entities, e.g., cells and biomolecules, are central tasks in the study of biomaterials. In this context, smart polymer interface materials have recently attracted much interest in biorelated applications and have broad prospects due to the excellent controllability of their surface properties by external stimuli. Among such materials, poly(N-isopropylacrylamide) and its copolymer films are especially attractive due to their reversible hydrogen-bonding-mediated reversible phase transition, which mimics natural biological processes. This platform is promising for tuning surface properties or to introduce novel biofunctionalities via copolymerization with various functional units and/or combination with other materials. Important progress in this field in recent years is highlighted.
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Affiliation(s)
- Taolei Sun
- State Key Laboratory of Advanced Technology for Materials Synthesis and Composite, Wuhan University of Technology, PR China.
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24
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Nie P, He X, Chen L. Temperature-sensitive chitosan membranes as a substrate for cell adhesion and cell sheet detachment. POLYM ADVAN TECHNOL 2011. [DOI: 10.1002/pat.1897] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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25
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Ma D, Chen H, Li Z, He Q. Thermomodulated cell culture∕harvest in polydimethylsiloxane microchannels with poly(N-isopropylacrylamide)-grafted surface. BIOMICROFLUIDICS 2010; 4:44107. [PMID: 21151579 PMCID: PMC3000856 DOI: 10.1063/1.3516038] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2010] [Accepted: 10/22/2010] [Indexed: 05/11/2023]
Abstract
Cell culture and harvest are the most upstream operation for a completely integrated cell assay chip. In our previous work, thermoresponsive poly(N-isopropylacrylamide) (PNIPAAm) was successfully grafted onto polydimethylsiloxane (PDMS) surface via benzophenone-initiated photopolymerization. In the present work, the PNIPAAm-grafted-PDMS (PNIPAAm-g-PDMS) surface was explored for thermomodulated cell culture and noninvasive harvest in microfluidic channels. Using COS 7 fibroblast from African green monkey kidney as the model cells, the thermomodulated adhering and detaching behaviors of the cells on the PNIPAAm-g-PDMS surfaces were optimized with respect to PNIPAAm-grafting yields and gelatin modification. The viability of the cells cultured on and harvested from the PNIPAAm-g-PDMS surface with the thermomodulated noninvasive protocol was estimated against the traditional cell culture∕harvest method involving trypsin digestion. The configuration of the microchannel on the PNIPAAm-g-PDMS chip was evaluated for static cell culture. Using a pipette-shaped PNIPAAm-g-PDMS microchannel, long-term cell culture could be achieved at 37 °C with periodic change of the culture medium every 12 h. After moving the microchip from the incubator set at 37 °C to the room temperature, the proliferated cells could be spontaneously detached from the PNIPAAm-g-PDMS surface of the upstream chamber and transferred by a gentle fluid flow to the downstream chamber, wherein the transferred cells could be subcultured. The thermomodulated cell culture, harvest, and passage operations on the PNIPAAm-g-PDMS microfluidic channels were demonstrated.
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Affiliation(s)
- Dan Ma
- Department of Chemistry, The Institute of Micro-analytical Systems, Zhejiang University, Zijin'gang Campus, Hangzhou 310058, China
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26
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Min EH, Ting SRS, Billon L, Stenzel MH. Thermo-responsive glycopolymer chains grafted onto honeycomb structured porous films via RAFT polymerization as a thermo-dependent switcher for lectin Concanavalin a conjugation. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/pola.24129] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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27
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Lee EL, von Recum HA. Cell culture platform with mechanical conditioning and nondamaging cellular detachment. J Biomed Mater Res A 2010; 93:411-8. [PMID: 20358641 DOI: 10.1002/jbm.a.32754] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Cells implanted after injury may remodel undesirably with improper mechanical stimulation from surrounding tissue. Proper conditioning of tissue engineered constructs before implantation can lead to suitable tissue architectures, along with an extracellular matrix (ECM) environment that more closely mimics native tissue. Additionally, cell implantation without bulky polymeric scaffolding is often desirable. Previous researchers have created devices capable of applying mechanical forces to cells (e.g., stretch) but cellular removal from these devices, such as by trypsin, often results in irreversible damage. Conversely, devices are available that can detach intact cells, but these are inelastic, nonstretchable substrates. We have created a cell culture platform that allows for mechanical conditioning and then subsequent nondamaging detachment of those cells. We have modified silicone culture surfaces, to incorporate thermally responsive polymers of N-isopropylacrylamide (NIPAAm) to create an elastic substrate that can also change surface properties with temperature change. A copolymer of NIPAAm and 10percent w/w acrylic acid (AAc) was conjugated to an amine-bonded silicone surface through carbodiimide chemistry. Cells were able to attach to the resulting surfaces at 37 degreeC and showed detachment by rounded morphology at 25degreeC. Following mechanical stretching, cells were still able to spontaneously detach from these modified silicone surfaces with temperature change.
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Affiliation(s)
- Elaine L Lee
- Department of Biomedical Engineering, Case Western Reserve University, Wickenden 220, 10900 Euclid Avenue,Cleveland, Ohio 44106, USA
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28
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Haraguchi K, Takada T. Synthesis and Characteristics of Nanocomposite Gels Prepared by In Situ Photopolymerization in an Aqueous System. Macromolecules 2010. [DOI: 10.1021/ma902693x] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kazutoshi Haraguchi
- Material Chemistry Laboratory, Kawamura Institute of Chemical Research, 631 Sakado, Sakura, Chiba 285-0078, Japan
| | - Tetsuo Takada
- Material Chemistry Laboratory, Kawamura Institute of Chemical Research, 631 Sakado, Sakura, Chiba 285-0078, Japan
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29
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Proliferation and multi-differentiation potentials of human mesenchymal stem cells on thermoresponsive PDMS surfaces grafted with PNIPAAm. Biosci Rep 2009; 30:149-58. [PMID: 19445653 DOI: 10.1042/bsr20090026] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
The thermo-responsivity of PNIPAAm [poly(N-isopropylcarylamide)]-grafted PDMS [poly(dimethylsiloxane)] surface is a property that could be feasibly used for detaching cells adhered on the surface. We used benzophenone-initiated photopolymerization to graft PNIPAAm on PDMS substrates to construct the PNIPAAm-grafted PDMS surface and this PDMS surface was highly thermo-responsive. hMSCs (human mesenchymal stem cells) were used to analyse the proliferation and multi-differentiation of stem cells on the PNIPAAm-grafted PDMS surface. The results showed that hMSCs could adhere on the PNIPAAm-grafted PDMS surface at 37 degrees C and form cell colonies, and then become fibroblastic. The proliferation potential of hMSCs on the PNIPAAm-grafted PDMS surface was not significantly different from that on a plate surface coated with gelatin. However, as it proved easier to detach cells from the surface, by changing temperature, a higher viability of detached cells could be obtained with the PNIPAAm-grafted PDMS surface, using a temperature shift, compared with a gelatin-coated surface, where cells are detached by treatment with trypsin. hMSCs on the PNIPAAm-grafted PDMS surface were induced into osteoblasts, adipocytes and neurocytes under osteogenic medium, adipogenic medium and neurogenic medium respectively. The PNIPAAm-grafted PDMS surface was favourable for osteogenesis of hMSCs, although the potentials of adipogenesis and neurogenesis of hMSCs on the PNIPAAm-grafted PDMS surface were similar to those on the plate surface coated with gelatin. The above results demonstrate that the PNIPAAm-grafted PDMS surface not only kept the potentials of proliferation and multi-differentiation of hMSCs, but also increased the viability of hMSCs.
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30
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Tang Q, Sun X, Li Q, Wu J, Lin J. A simple route to interpenetrating network hydrogel with high mechanical strength. J Colloid Interface Sci 2009; 339:45-52. [DOI: 10.1016/j.jcis.2009.07.026] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2009] [Revised: 06/05/2009] [Accepted: 07/13/2009] [Indexed: 10/20/2022]
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31
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Muñoz-Muñoz F, Ruiz JC, Alvarez-Lorenzo C, Concheiro A, Bucio E. Novel interpenetrating smart polymer networks grafted onto polypropylene by gamma radiation for loading and delivery of vancomycin. Eur Polym J 2009. [DOI: 10.1016/j.eurpolymj.2009.04.023] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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