151
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Fabrication of conducting electrospun nanofibers scaffold for three-dimensional cells culture. Int J Biol Macromol 2012; 51:627-31. [DOI: 10.1016/j.ijbiomac.2012.06.014] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2012] [Revised: 05/24/2012] [Accepted: 06/12/2012] [Indexed: 11/23/2022]
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152
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Idota N, Kikuchi A, Kobayashi J, Sakai K, Okano T. Modulation of graft architectures for enhancing hydrophobic interaction of biomolecules with thermoresponsive polymer-grafted surfaces. Colloids Surf B Biointerfaces 2012; 99:95-101. [DOI: 10.1016/j.colsurfb.2011.10.033] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2011] [Revised: 10/16/2011] [Accepted: 10/18/2011] [Indexed: 10/15/2022]
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153
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Van Gough D, Bunker BC, Roberts ME, Huber DL, Zarick HF, Austin MJ, Wheeler JS, Moore D, Spoerke ED. Thermally programmable pH buffers. ACS APPLIED MATERIALS & INTERFACES 2012; 4:6247-6251. [PMID: 23130670 DOI: 10.1021/am301836p] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Many reactions in both chemistry and biology rely on the ability to precisely control and fix the solution concentrations of either protons or hydroxide ions. In this report, we describe the behavior of thermally programmable pH buffer systems based on the copolymerization of varying amounts of acrylic acid (AA) groups into N-isopropylacrylamide polymers. Because the copolymers undergo phase transitions upon heating and cooling, the local environment around the AA groups can be reversibly switched between hydrophobic and hydrophilic states affecting the ionization behavior of the acids. Results show that moderate temperature variations can be used to change the solution pH by two units. However, results also indicate that the nature of the transition and its impact on the pH values are highly dependent on the AA content and the degree of neutralization.
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Affiliation(s)
- Dara Van Gough
- Electronic, Optical, and Nanostructures, Sandia National Laboratories, Albuquerque, New Mexico 87185, USA.
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154
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Balamurugan SS, Subramanian B, Bolivar JG, McCarley RL. Aqueous-based initiator attachment and ATRP grafting of polymer brushes from poly(methyl methacrylate) substrates. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:14254-60. [PMID: 22967226 PMCID: PMC3525093 DOI: 10.1021/la302922p] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Many polymers, such as PMMA, are very susceptible to swelling or dissolution by organic solvents. Growing covalently attached polymer brushes from these surfaces by atom-transfer radical polymerization (ATRP) is challenging because of the typical requirement of organic solvent for initiator immobilization. We report an unprecedented, aqueous-based route to graft poly(N-isopropylacrylamide), PNIPAAm, from poly(methyl methacrylate), PMMA, surfaces by ATRP, wherein the underlying PMMA is unaffected. Successful attachment of the ATRP initiator, N-hydroxysuccinimidyl-2-bromo-2-methylpropionate, on amine-bearing PMMA surfaces was confirmed by XPS. From this surface-immobilized initiator, thermoresponsive PNIPAAm brushes were grown by aqueous ATRP to yield optically transparent PNIPAAm-grafted PMMA surfaces. This procedure is valuable, as it can be applied for the aqueous-based covalent attachment of ATRP initiator on any amine-functionalized surface, with subsequent polymerization of a variety of monomers.
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Affiliation(s)
- Sreelatha S. Balamurugan
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803-1804, United States
| | - Balamurugan Subramanian
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803-1804, United States
| | - Jowell G. Bolivar
- The Wright Group, 6428 Airport Road, Crowley, Louisiana 70526, United States
| | - Robin L. McCarley
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803-1804, United States
- Corresponding Author:
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155
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Volden S, Ese MHG, Zhu K, Yasuda M, Nyström B, Glomm WR. Interactions between bovine serum albumin and Langmuir films composed of charged and uncharged poly(N-isopropylacrylamide) block copolymers. Colloids Surf B Biointerfaces 2012; 98:50-7. [DOI: 10.1016/j.colsurfb.2012.04.038] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2011] [Revised: 03/30/2012] [Accepted: 04/26/2012] [Indexed: 11/26/2022]
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156
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Zhu PW. Nonequilibrium polymer chains induced by conformational transitions in densely interfacial layers. J Chem Phys 2012; 137:104903. [PMID: 22979886 DOI: 10.1063/1.4751479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Nonequilibrium poly(N-isopropylacrylamide) (PNIPAM) chains are generated by temperature-induced conformational transitions in the densely interfacial PNIPAM layer at high adsorbed amounts in aqueous solution. The interleaving chains relax in a spatially heterogeneous space of adsorbed layer which is filled with the domains via the hydrogen bonding and hydrophobic interactions. The relaxation dynamics of interleaving chains is changed from the weekly stretched exponential behaviour at the lower adsorbed amount to the strongly stretched exponential behaviour at the higher adsorbed amount. The kinetic constraints for the relaxation dynamics depend on the segment density of the adsorbed layer which is controlled by the temperature. The stretched exponential relaxation is related to an ensemble of relaxations confined in the domains with different physical origins for the heterogeneous dynamics. The range of energy barriers for the relaxation is estimated from the stretched exponent based on the random first order transition theory.
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Affiliation(s)
- Peng-Wei Zhu
- Cooperative Research Centre for Polymers, Melbourne, Australia
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157
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Dunderdale G, Howse J, Fairclough P. pH-dependent control of particle motion through surface interactions with patterned polymer brush surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:12955-12961. [PMID: 22891947 DOI: 10.1021/la302384j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
In this Article, we show that inclined silicon surfaces patterned with poly(methacrylic acid) brushes are able to control the position and movement of 20 μm silica particles, which are propelled across the patterned surface by sedimentation forces. Three different types of behavior were observed depending on the angle between the direction in which a particle sedimented and the orientation of the polymer-brush silicon interface. At small angles, particles were found to sediment to the brush interface and then sediment following the direction of the brush interface. At larger angles, particles sedimented to the interface and then followed the direction of the brush interface, but then after a certain distance changed direction to pass over the interface. At the largest angles where the brush interface was approximately perpendicular to the motion of the particle, particles were found to travel over the interface unperturbed. This behavior was also found to be pH dependent, allowing the formation of pH responsive "gates", which allow particles to pass at low pH but not at high pH. It was also found that if patterned polymer brush surfaces were oriented in the correct way, they were able to control the number of particles present at specific locations.
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Affiliation(s)
- Gary Dunderdale
- Department of Chemistry, University of Sheffield, Sheffield, United Kingdom.
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158
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Gurkan UA, Tasoglu S, Akkaynak D, Avci O, Unluisler S, Canikyan S, MacCallum N, Demirci U. Smart interface materials integrated with microfluidics for on-demand local capture and release of cells. Adv Healthc Mater 2012; 1:661-8. [PMID: 23184803 PMCID: PMC3774603 DOI: 10.1002/adhm.201200009] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2012] [Revised: 01/26/2012] [Indexed: 01/10/2023]
Abstract
Stimuli responsive, smart interface materials are integrated with microfluidic technologies creating new functions for a broad range of biological and clinical applications by controlling the material and cell interactions. Local capture and on-demand local release of cells are demonstrated with spatial and temporal control in a microfluidic system.
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Affiliation(s)
- Umut Atakan Gurkan
- Postdoctoral Research Fellow in Medicine, Harvard Medical School, Brigham and Women’s Hospital, Harvard-MIT Health Sciences & Technology, 65 Landsdowne St. PRB 252, Cambridge, MA 02139, USA
| | - Savas Tasoglu
- Postdoctoral Research Fellow in Medicine, Harvard Medical School, Brigham and Women’s Hospital, Harvard-MIT Health Sciences & Technology, 65 Landsdowne St. PRB 252, Cambridge, MA 02139, USA
| | - Derya Akkaynak
- Massachusetts Institute of Technology (MIT) Department of Mechanical Engineering, Woods Hole Oceanographic Institution (WHOI) Joint Program in Oceanography, Applied Ocean Science and Engineering, Cambridge, MA, USA
| | - Oguzhan Avci
- Harvard Medical School, Brigham and Women’s Hospital, 65 Landsdowne St. PRB 252, Cambridge, MA 02139, USA
| | - Sebnem Unluisler
- Harvard Medical School, Brigham and Women’s Hospital, 65 Landsdowne St. PRB 252, Cambridge, MA 02139, USA
| | - Serli Canikyan
- Harvard Medical School, Brigham and Women’s Hospital, 65 Landsdowne St. PRB 252, Cambridge, MA 02139, USA
| | - Noah MacCallum
- Harvard Medical School, Brigham and Women’s Hospital, 65 Landsdowne St. PRB 252, Cambridge, MA 02139, USA
| | - Utkan Demirci
- Assistant Professor, Harvard Medical School, Brigham and Women’s Hospital, Harvard-MIT Health Sciences & Technology, 65 Landsdowne St. PRB 252, Cambridge, MA 02139, USA
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159
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Surface treatment of polymeric materials controlling the adhesion of biomolecules. J Funct Biomater 2012; 3:528-43. [PMID: 24955631 PMCID: PMC4030997 DOI: 10.3390/jfb3030528] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2012] [Revised: 07/25/2012] [Accepted: 07/26/2012] [Indexed: 01/29/2023] Open
Abstract
This review describes different strategies of surface elaboration for a better control of biomolecule adsorption. After a brief description of the fundamental interactions between surfaces and biomolecules, various routes of surface elaboration are presented dealing with the attachment of functional groups mostly thanks to plasma techniques, with the grafting to and from methods, and with the adsorption of surfactants. The grafting of stimuli-responsive polymers is also pointed out. Then, the discussion is focused on the protein adsorption phenomena showing how their interactions with solid surfaces are complex. The adsorption mechanism is proved to be dependent on the solid surface physicochemical properties as well as on the surface and conformation properties of the proteins. Different behaviors are also reported for complex multiple protein solutions.
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160
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Poly(N-isopropylacrylamide)-modified silica beads with hyperbranched polysiloxysilane for three-dimensional cell cultivation. Polym J 2012. [DOI: 10.1038/pj.2012.124] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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161
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Okada K, Tokudome Y, Falcaro P, Takamatsu Y, Nakahira A, Takahashi M. Titanate nanofunnel brushes: toward functional interfacial applications. Chem Commun (Camb) 2012; 48:6130-2. [PMID: 22588181 DOI: 10.1039/c2cc32081a] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Titanate nanofunnel brushes were grown on sol-gel derived amorphous TiO(2) thin films, whose shape can be tuned from nanosheets to nanofunnels by changing hydrothermal conditions. A superhydrophobic adhesive surface was achieved by a chemical modification of the brushes.
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Affiliation(s)
- Kenji Okada
- Department of Materials Science, Osaka Prefecture University, Sakai, Osaka, 599-8531, Japan
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162
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Johnson BN, Mutharasan R. pH effect on protein G orientation on gold surfaces and characterization of adsorption thermodynamics. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:6928-6934. [PMID: 22497325 DOI: 10.1021/la3009128] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The pH effect on adsorbed antibody-binding protein (protein G) orientation on gold (Au) and its adsorption thermodynamic characteristics were investigated using quartz crystal microbalance (QCM) and X-ray photoelectron spectroscopy (XPS). The adsorbed protein G orientation was measured by binding response of two antibody-antigen systems: the model bovine serum albumin (BSA) and the foodborne pathogen E. coli O157:H7. Surface coverage was not significantly affected by pH, but its orientation was. The most properly oriented protein G for antibody binding was achieved at near-neutral pH. Adsorption was verified by XPS measurements using nitrogen (N) 1s, oxygen (O) 1s, and Au 4p peak heights. Adsorption energetics were determined by van't Hoff and Langmuir kinetic analyses of adsorption data obtained at 296, 303, and 308 K. Large characteristic entropy change of protein adsorption was observed (ΔS° = 0.52 ± 0.01 kcal/mol·K). The adsorption process was not classical physisorption but exhibited chemisorption characteristics based on significant enthalpy change (ΔH° = -25 ± 6 kcal/mol).
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Affiliation(s)
- Blake N Johnson
- Department of Chemical and Biological Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States
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163
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Bain ED, Dawes K, Özçam AE, Hu X, Gorman CB, Šrogl J, Genzer J. Surface-Initiated Polymerization by Means of Novel, Stable, Non-Ester-Based Radical Initiator. Macromolecules 2012. [DOI: 10.1021/ma300491e] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Erich D. Bain
- Department of Chemical & Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695, United States
| | - Keith Dawes
- Department of Chemical & Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695, United States
| | - A. Evren Özçam
- Department of Chemical & Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695, United States
| | - Xinfang Hu
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina
27695, United States
| | - Christopher B. Gorman
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina
27695, United States
| | - Jiří Šrogl
- Institute of Chemistry & Biochemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Jan Genzer
- Department of Chemical & Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695, United States
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164
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Affiliation(s)
- Shingo Maeda
- a Advanced Research Institute for Science and Engineering, Waseda University, 3-4-1 Okubo Shinjuku-ku, Tokyo 169-8555, Japan
| | - Yusuke Hara
- b Consolidated Research Institute for Advanced Science and Medical Care, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
| | - Ryo Yoshida
- c PRESTO, Japan Science and Technology Agency, 4-1-8 Honcho Kawaguchi, Saitama 332-0012, Japan; Department of Materials Engineering, Graduate School of Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 135-8656, Japan
| | - Shuji Hashimoto
- d Advanced Research Institute for Science and Engineering, Waseda University, 3-4-1 Okubo Shinjuku-ku, Tokyo 169-8555, Japan; Consolidated Research Institute for Advanced Science and Medical Care, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan; Department of Applied Physics, Waseda University, 3-4-1 Okubo Shinjuku-ku, Tokyo 169-8555, Japan
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165
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Mérian T, Goddard JM. Advances in nonfouling materials: perspectives for the food industry. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2012; 60:2943-2957. [PMID: 22393944 DOI: 10.1021/jf204741p] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Fouling of complex food components onto food-processing materials affects food quality, food safety, and operating efficiency. Developments in nonfouling and fouling-release materials for biomedical and marine applications enable the potential for adaptation to food applications; however, challenges remain. The purpose of this review is to present different strategies to prevent fouling and/or facilitate foulant removal with a critical point of view for an application of such materials on food-processing surfaces. Nonfouling, self-cleaning, and amphiphilic materials are reviewed, including an explanation of the mechanism of action, as well as inherent limitations of each technology. Perspectives on future research directions for the design of food processing surfaces with antifouling and/or fouling release properties are provided.
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Affiliation(s)
- Tiphaine Mérian
- Department of Food Science, University of Massachusetts, Amherst, Massachusetts 01003, USA
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166
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Bittrich E, Burkert S, Müller M, Eichhorn KJ, Stamm M, Uhlmann P. Temperature-sensitive swelling of poly(N-isopropylacrylamide) brushes with low molecular weight and grafting density. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:3439-3448. [PMID: 22239605 DOI: 10.1021/la204230a] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Temperature-sensitive poly(N-isopropylacrylamide) (PNIPAAm) brushes with different molecular weights M(n) and grafting densities σ were prepared by the "grafting-to" method. Changes in their physicochemical properties according to temperature were investigated with the help of in situ spectroscopic ellipsometry and in situ attenuated total reflection Fourier-transform infrared (ATR-FTIR) spectroscopy. Brush criteria indicate a transition between a brush conformation below the lower critical solution temperature (LCST) and an intermediate to mushroom conformation above the LCST. By in situ ellipsometry distinct changes in the brush layer parameters (wet thickness, refractive index, buffer content) were observed. A broadening of the temperature region with maximum deswelling occurred with decreasing grafting density. The brush layer properties were independent of the grafting density below the LCST, but showed a virtually monotonic behavior above the LCST. The midtemperature ϑ(half) of the deswelling process increased with increasing grafting density. Thus grafting density-dependent design parameters for such functional films were presented. For the first time, ATR-FTIR spectroscopy was used to monitor segment density and hydrogen bonding changes of these very thin PNIPAAm brushes as a function of temperature based on significant variations of the methyl stretching, Amide I, as well as Amide II bands with respect to intensity and wavenumber position. No dependence on M(n) and σ in the wavenumber shift of these bands above the LCST was found. The temperature profile of these band intensities and thus segment density was found to be rather step-like, exceeding temperatures around the LCST, while the respective profile of their wavenumber positions suggested continuous structural and hydration processes. Remaining buffer amounts and residual intermolecular segment/water interaction in the collapsed brushes above the LCST could be confirmed by both in situ methods.
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Affiliation(s)
- Eva Bittrich
- Leibniz Institute of Polymer Research Dresden, Hohe Strasse 6, D-01069 Dresden, Germany
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167
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Kelly JC, Pepin M, Huber DL, Bunker BC, Roberts ME. Reversible control of electrochemical properties using thermally-responsive polymer electrolytes. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2012; 24:886-9. [PMID: 22253076 DOI: 10.1002/adma.201103340] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2011] [Revised: 12/15/2011] [Indexed: 05/22/2023]
Abstract
A thermally responsive copolymer is designed to modulate the properties of an electrolyte solution. The copolymer is prepared using pNIPAM, which governs the thermal properties, and acrylic acid, which provides the electrolyte ions. As the polymer undergoes a thermally activated phase transition, the local environment around the acid groups is reversibly switched, decreasing ion concentration and conductivity. The responsive electrolyte is used to control the activity of redox electrodes with temperature.
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Affiliation(s)
- Jesse C Kelly
- Department of Chemical & Biomolecular Engineering, Clemson University, Clemson, SC 29631, USA
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168
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Cabane E, Zhang X, Langowska K, Palivan CG, Meier W. Stimuli-responsive polymers and their applications in nanomedicine. Biointerphases 2012; 7:9. [PMID: 22589052 DOI: 10.1007/s13758-011-0009-3] [Citation(s) in RCA: 243] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2011] [Accepted: 11/29/2011] [Indexed: 11/27/2022] Open
Abstract
This review focuses on smart nano-materials built of stimuli-responsive (SR) polymers and will discuss their numerous applications in the biomedical field. The authors will first provide an overview of different stimuli and their corresponding, responsive polymers. By introducing myriad functionalities, SR polymers present a wide range of possibilities in the design of stimuli-responsive devices, making use of virtually all types of polymer constructs, from self-assembled structures (micelles, vesicles) to surfaces (polymer brushes, films) as described in the second section of the review. In the last section of this review the authors report on some of the most promising applications of stimuli-responsive polymers in nanomedicine. In particular, we will discuss applications pertaining to diagnosis, where SR polymers are used to construct sensors capable of selective recognition and quantification of analytes and physical variables, as well as imaging devices. We will also highlight some examples of responsive systems used for therapeutic applications, including smart drug delivery systems (micelles, vesicles, dendrimers...) and surfaces for regenerative medicine.
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Affiliation(s)
- Etienne Cabane
- Chemistry Department, University of Basel, Klingelbergstrasse 80, 4056, Basel, Switzerland
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169
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Chakrabarty T, Kumar M, Shahi VK. pH Responsive Hybrid Zwitterionomer for Protein Separation: Smart Nanostructured Adsorbent. Ind Eng Chem Res 2012. [DOI: 10.1021/ie202878j] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Tina Chakrabarty
- Electro-Membrane Processes Division, Central Salt and Marine Chemicals Research Institute, Council of Scientific & Industrial Research (CSIR), G. B. Marg, Bhavnagar 364002 (Gujarat), India
| | - Mahendra Kumar
- Electro-Membrane Processes Division, Central Salt and Marine Chemicals Research Institute, Council of Scientific & Industrial Research (CSIR), G. B. Marg, Bhavnagar 364002 (Gujarat), India
| | - Vinod K. Shahi
- Electro-Membrane Processes Division, Central Salt and Marine Chemicals Research Institute, Council of Scientific & Industrial Research (CSIR), G. B. Marg, Bhavnagar 364002 (Gujarat), India
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170
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Ivanov AE, Solodukhina NM, Nilsson L, Nikitin MP, Nikitin PI, Zubov VP, Vikhrov AA. Binding of mucin to water-soluble and surface-grafted boronate-containing polymers. POLYMER SCIENCE SERIES A 2012. [DOI: 10.1134/s0965545x12010026] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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171
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Korten T, Birnbaum W, Kuckling D, Diez S. Selective control of gliding microtubule populations. NANO LETTERS 2012; 12:348-353. [PMID: 22149218 DOI: 10.1021/nl203632y] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
First lab-on-chip devices based on active transport by biomolecular motors have been demonstrated for basic detection and sorting applications. However, to fully employ the advantages of such hybrid nanotechnology, versatile spatial and temporal control mechanisms are required. Using a thermo-responsive polymer, we demonstrate the selective starting and stopping of modified microtubules gliding on a kinesin-1-coated surface. This approach allows the self-organized separation of multiple microtubule populations and their respective cargoes.
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Affiliation(s)
- Till Korten
- Max Planck Institute of Molecular Cell Biology and Genetics Dresden, Dresden, Germany
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172
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Hong D, Kang K, Hong SP, Shon HK, Son JG, Lee TG, Choi IS. Electrochemical release of amine molecules from carbamate-based, electroactive self-assembled monolayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:17-21. [PMID: 22132927 DOI: 10.1021/la203420h] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In this paper, carbamate-based self-assembled monolayers (SAMs) of alkanethiolates on gold were suggested as a versatile platform for release of amine-bearing molecules in response to the electrical signal. The designed SAMs underwent the electrochemical oxidation on the gold surface with simultaneous release of the amine molecules. The synthesis of the thiol compounds was achieved by coupling isocyanate-containing compounds with hydroquinone. The electroactive thiol was mixed with 11-mercaptoundecanol [HS(CH(2))(11)OH] to form a mixed monolayer, and cyclic votammetry was used for the characterization of the release behaviors. The mixed SAMs showed a first oxidation peak at +540 mV (versus Ag/AgCl reference electrode), indicating the irreversible conversion from carbamate to hydroquinone groups with simultaneous release of the amine molecules. The analysis of ToF-SIMS further indicated that the electrochemical reaction on the gold surface successfully released amine molecules.
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Affiliation(s)
- Daewha Hong
- Molecular-Level Interface Research Center, Department of Chemistry, KAIST, Daejeon 305-701, Korea
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173
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Ionov L, Minko S. Mixed polymer brushes with locking switching. ACS APPLIED MATERIALS & INTERFACES 2012; 4:483-9. [PMID: 22220904 DOI: 10.1021/am201736t] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Mixed polymer brushes, made of two different kinds of polymers randomly grafted to the same solid substrate, were introduced as switchable interfaces for a number of promising applications. The switching properties of the mixed polymer brushes are substantially dependent on grafting density, molecular weight, compatibility of two distinct grafted polymers, and their interaction with the solvent. This work reports the mixed polymer brushes with the property of locking switching. The wetting properties of such a mixed brush can be switched between the wetting properties of individual constituting polymers by appropriate selection of solvent. However, the mixed polymer brushes wetting behavior can be locked in the hydrophobic state. This kinetically frozen methastable state, however, can be unlocked via treatment by proper "unlocking" solvent. This locking and unlocking of the hydrophobic state of the mixed brush with specific solvents could find useful applications for the development of functional materials.
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Affiliation(s)
- Leonid Ionov
- Department of Chemistry and Biomolecular Science, Clarkson University, Potsdam, New York 13699, USA.
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174
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Cimen D, Caykara T. Biofunctional oligoN-isopropylacrylamide brushes on silicon wafer surface. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm15812d] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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175
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Abstract
There is an increasing demand on the development of "smart" switchable interfaces since controlling surface topography and chemical functionality on a nanometer scale is crucial for numerous biomedical applications. Those surfaces, which are based on stimuli responsive polymers (SRPs), are able to modify their interactions with cells, biomolecules responding to different physical (e.g., temperature) or chemical (e.g., pH) stimuli. Such behavior may partially mimic complex dynamic properties of natural systems that are regulated by many biological stimuli. This paper reviews major studies and applications of SRPs as biointerfaces in a form of thin polymeric films (gels) and surface tethered polymers (brushes).
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177
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Gurkan UA, Anand T, Tas H, Elkan D, Akay A, Keles HO, Demirci U. Controlled viable release of selectively captured label-free cells in microchannels. LAB ON A CHIP 2011; 11:3979-89. [PMID: 22002065 PMCID: PMC3814023 DOI: 10.1039/c1lc20487d] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Selective capture of cells from bodily fluids in microchannels has broadly transformed medicine enabling circulating tumor cell isolation, rapid CD4(+) cell counting for HIV monitoring, and diagnosis of infectious diseases. Although cell capture methods have been demonstrated in microfluidic systems, the release of captured cells remains a significant challenge. Viable retrieval of captured label-free cells in microchannels will enable a new era in biological sciences by allowing cultivation and post-processing. The significant challenge in release comes from the fact that the cells adhere strongly to the microchannel surface, especially when immuno-based immobilization methods are used. Even though fluid shear and enzymes have been used to detach captured cells in microchannels, these methods are known to harm cells and affect cellular characteristics. This paper describes a new technology to release the selectively captured label-free cells in microchannels without the use of fluid shear or enzymes. We have successfully released the captured CD4(+) cells (3.6% of the mononuclear blood cells) from blood in microfluidic channels with high specificity (89% ± 8%), viability (94% ± 4%), and release efficiency (59% ± 4%). We have further validated our system by specifically capturing and controllably releasing the CD34(+) stem cells from whole blood, which were quantified to be 19 cells per million blood cells in the blood samples used in this study. Our results also indicated that both CD4(+) and CD34(+) cells released from the microchannels were healthy and amenable for in vitro culture. Manual flow based microfluidic method utilizes inexpensive, easy to fabricate microchannels allowing selective label-free cell capture and release in less than 10 minutes, which can also be used at the point-of-care. The presented technology can be used to isolate and purify a broad spectrum of cells from mixed populations offering widespread applications in applied biological sciences, such as tissue engineering, regenerative medicine, rare cell and stem cell isolation, proteomic/genomic research, and clonal/population analyses.
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Affiliation(s)
- Umut Atakan Gurkan
- Demirci Bio-Acoustic-MEMS in Medicine (BAMM) Laboratory, Center for Biomedical Engineering, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, 65 Landsdowne St PRB, Rm. 267, Boston, MA, USA
| | - Tarini Anand
- Demirci Bio-Acoustic-MEMS in Medicine (BAMM) Laboratory, Center for Biomedical Engineering, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, 65 Landsdowne St PRB, Rm. 267, Boston, MA, USA
| | - Huseyin Tas
- Demirci Bio-Acoustic-MEMS in Medicine (BAMM) Laboratory, Center for Biomedical Engineering, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, 65 Landsdowne St PRB, Rm. 267, Boston, MA, USA
| | - David Elkan
- Demirci Bio-Acoustic-MEMS in Medicine (BAMM) Laboratory, Center for Biomedical Engineering, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, 65 Landsdowne St PRB, Rm. 267, Boston, MA, USA
| | - Altug Akay
- Demirci Bio-Acoustic-MEMS in Medicine (BAMM) Laboratory, Center for Biomedical Engineering, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, 65 Landsdowne St PRB, Rm. 267, Boston, MA, USA
| | - Hasan Onur Keles
- Demirci Bio-Acoustic-MEMS in Medicine (BAMM) Laboratory, Center for Biomedical Engineering, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, 65 Landsdowne St PRB, Rm. 267, Boston, MA, USA
| | - Utkan Demirci
- Demirci Bio-Acoustic-MEMS in Medicine (BAMM) Laboratory, Center for Biomedical Engineering, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, 65 Landsdowne St PRB, Rm. 267, Boston, MA, USA
- Harvard-MIT Health Sciences and Technology, Cambridge, MA, USA
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178
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179
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Jin CY, Li Z, Williams RS, Lee KC, Park I. Localized temperature and chemical reaction control in nanoscale space by nanowire array. NANO LETTERS 2011; 11:4818-4825. [PMID: 21967343 DOI: 10.1021/nl2026585] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We introduce a novel method for chemical reaction control with nanoscale spatial resolution based on localized heating by using a well-aligned nanowire array. Numerical and experimental analysis shows that each individual nanowire could be selectively and rapidly Joule heated for local and ultrafast temperature modulation in nanoscale space (e.g., maximum temperature gradient 2.2 K/nm at the nanowire edge; heating/cooling time < 2 μs). By taking advantage of this capability, several nanoscale chemical reactions such as polymer decomposition/cross-linking and direct and localized hydrothermal synthesis of metal oxide nanowires were demonstrated.
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Affiliation(s)
- C Yan Jin
- Department of Mechanical Engineering and KI for the NanoCentury, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea
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180
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Synthesis and self-assembly of diblock copolymers bearing 2-nitrobenzyl photocleavable side groups. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/pola.25069] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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181
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Zhang M, Akbulut M. Adsorption, desorption, and removal of polymeric nanomedicine on and from cellulose surfaces: effect of size. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:12550-9. [PMID: 21879763 DOI: 10.1021/la202287k] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
The increased production and commercial use of nanoparticulate drug delivery systems combined with a lack of regulation to govern their disposal may result in their introduction to soils and ultimately into groundwater systems. To better understand how such particles interact with environmentally significant interfaces, we study the adsorption, desorption, and removal behavior of poly(ethylene glycol)-based nanoparticulate drug delivery systems on and from cellulose, which is the most common organic compound on Earth. It is shown that such an adsorption process is only partially reversible, and most of the adsorbate particles do not desorb from the cellulose surface even upon rinsing with a large amount of water. The rate constant of adsorption decreases with increasing particle size. Furthermore, hydrodynamic forces acting parallel to the surfaces are found to be of great importance in the context of particle dynamics near the cellulose surface, and ultimately responsible for the removal of some fraction of particles via rolling or sliding. As the particle size increases, the removal rates of the particles increase for a given hydrodynamical condition.
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Affiliation(s)
- Ming Zhang
- Artie McFerrin Department of Chemical Engineering, Materials Science and Engineering Program, Texas A&M University, 230 Jack E. Brown Engineering Building, 3122 TAMU, College Station, Texas 77843-3122, USA
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182
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Lessard B, Marić M. “Smart” poly(2-(dimethylamino)ethyl methacrylate-ran-9-(4-vinylbenzyl)-9H-carbazole) copolymers synthesized by nitroxide mediated radical polymerization. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/pola.25004] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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183
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Alf ME, Hatton TA, Gleason KK. Insights into thin, thermally responsive polymer layers through quartz crystal microbalance with dissipation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:10691-10698. [PMID: 21806008 DOI: 10.1021/la201935r] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The thermodynamics of temperature-responsive polymeric layers was analyzed using a two-state coil to globule model to which the van't Hoff relationship was applied. For soluble homopolymer poly(N-isopropylacrylamide (pNIPAAm), enthalpies of transition, ΔH(vH), were calculated using varations in ultraviolet-visible (UV-vis) spectroscopy with temperature to be 8400 ± 30 and 1652 ± 4 kJ mol-cooperative unit(-1) for standard synthesis and initiated chemical vapor deposition (iCVD), respectively. For the insoluble surface-bound layer of cross-linked iCVD poly(N-isopropylacrylamide-co-di(ethylene glycol) divinyl ether) [p(NIPAAm-co-DEGDVE)], ΔH(vH) was determined to be 810 ± 30 kJ mol-cooperative unit(-1) using quartz crystal microbalance with dissipation monitoring (QCM-D). Microcalorimetry measurements showed the enthalpies per mole NIPAAm monomer to be 5.8 ± 0.2, 3.5 ± 0.6, and 3.1 ± 0.3 kJ mol-NIPAAm(-1), resulting in cooperative unit sizes of 1460 ± 60, 470 ± 80, and 260 ± 30 monomer units for the standard pNIPAAm, iCVD pNIPAAm, and p(NIPAAm-co-DEGDVE) systems, respectively. These values indicate that both per monomer enthalpic contribution as well as cooperative unit size are primary factors contributing to the variations in van't Hoff enthalpies for the three systems studied. Diffusion of bovine serum albumin (BSA) into swollen p(NIPAAm-co-DEGDVE) films below its lower critical solution temperature was elucidated via QCM-D measurements. These data provided a calculated diffusion coefficient of (3.5 ± 0.1) × 10(-14) cm(2) s(-1) of BSA into the swollen hydrogel film with a mesh size of 6.0 ± 0.2 nm (compared to the hydrodynamic radius of BSA, r(H) = 3.36 nm).
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Affiliation(s)
- Mahriah E Alf
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, Massachusetts 02139, USA
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184
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Halperin A, Kröger M. Collapse of Thermoresponsive Brushes and the Tuning of Protein Adsorption. Macromolecules 2011. [DOI: 10.1021/ma201006h] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- A. Halperin
- University of Grenoble 1/CNRS, LIPhy UMR 5588, BP 87, 38041 Grenoble, France
| | - M. Kröger
- Polymer Physics, ETH Zurich, Wolfgang-Pauli-Strasse 10, CH-8093 Zurich, Switzerland
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185
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Investigation of temperature-responsivity and aqueous chromatographic characteristics of a thermo-responsive monolithic column. Talanta 2011; 85:1193-8. [DOI: 10.1016/j.talanta.2011.05.034] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2011] [Revised: 05/11/2011] [Accepted: 05/19/2011] [Indexed: 11/19/2022]
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186
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Wang CH, Mukherjee S, Maidul Islam AKM, Yang YW, Mukherjee M. Role of Interfacial Interaction in Orientation of Poly(N-isopropylacrylamide) Chains on Silicon Substrate. Macromolecules 2011. [DOI: 10.1021/ma200614w] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- C.-H. Wang
- National Synchrotron Radiation Research Center, Hsinchu 30077, Taiwan
| | - S. Mukherjee
- Surface Physics Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India
| | - A. K. M. Maidul Islam
- Surface Physics Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India
| | - Y.-W. Yang
- National Synchrotron Radiation Research Center, Hsinchu 30077, Taiwan
- Department of Chemistry, National Tsing-Hua University, Hsinchu 30013, Taiwan
| | - M. Mukherjee
- Surface Physics Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India
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187
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Zhao T, Chen H, Zheng J, Yu Q, Wu Z, Yuan L. Inhibition of protein adsorption and cell adhesion on PNIPAAm-grafted polyurethane surface: Effect of graft molecular weight. Colloids Surf B Biointerfaces 2011; 85:26-31. [DOI: 10.1016/j.colsurfb.2010.10.047] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2010] [Revised: 10/28/2010] [Accepted: 10/28/2010] [Indexed: 10/18/2022]
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188
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Lu Y, Ballauff M. Thermosensitive core–shell microgels: From colloidal model systems to nanoreactors. Prog Polym Sci 2011. [DOI: 10.1016/j.progpolymsci.2010.12.003] [Citation(s) in RCA: 209] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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189
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Li L, Wu J, Gao C. Gradient immobilization of a cell adhesion RGD peptide on thermal responsive surface for regulating cell adhesion and detachment. Colloids Surf B Biointerfaces 2011; 85:12-8. [DOI: 10.1016/j.colsurfb.2010.09.028] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2010] [Revised: 09/15/2010] [Accepted: 09/30/2010] [Indexed: 11/26/2022]
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190
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191
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Yi G, Zhu Z, Wang F, Chen X, Yang J, Huang Y. Study of Phase Separation of Poly(N-isopropylacrylamide-co-styrene) Aqueous Solutions with Rayleigh Scattering Technique. CHINESE J CHEM 2011. [DOI: 10.1002/cjoc.201190177] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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192
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Chen GD, Fachin F, Fernandez-Suarez M, Wardle BL, Toner M. Nanoporous elements in microfluidics for multiscale manipulation of bioparticles. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2011; 7:1061-7. [PMID: 21413145 PMCID: PMC3141316 DOI: 10.1002/smll.201002076] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2010] [Revised: 01/21/2011] [Indexed: 05/18/2023]
Abstract
Solid materials, such as silicon, glass, and polymers, dominate as structural elements in microsystems including microfluidics. Porous elements have been limited to membranes sandwiched between microchannel layers or polymer monoliths. This paper reports the use of micropatterned carbon-nanotube forests confined inside microfluidic channels for mechanically and/or chemically capturing particles ranging over three orders of magnitude in size. Nanoparticles below the internanotube spacing (80 nm) of the forest can penetrate inside the forest and interact with the large surface area created by individual nanotubes. For larger particles (>80 nm), the ultrahigh porosity of the nanotube elements reduces the fluid boundary layer and enhances particle-structure interactions on the outer surface of the patterned nanoporous elements. Specific biomolecular recognition is demonstrated using cells (≈10 μm), bacteria (≈1 μm), and viral-sized particles (≈40 nm) using both effects. This technology can provide unprecedented control of bioseparation processes to access bioparticles of interest, opening new pathways for both research and point-of-care diagnostics.
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Affiliation(s)
| | | | - Marta Fernandez-Suarez
- BioMEMS Resource Center, Massachusetts General Hospital, 114 16th Street, Charlestown, MA 02139, USA
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193
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Balogh D, Tel-Vered R, Freeman R, Willner I. Photochemically and Electrochemically Triggered Au Nanoparticles “Sponges”. J Am Chem Soc 2011; 133:6533-6. [DOI: 10.1021/ja2009899] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Dora Balogh
- The Center for Nanoscience and Nanotechnology and the Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Ran Tel-Vered
- The Center for Nanoscience and Nanotechnology and the Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Ronit Freeman
- The Center for Nanoscience and Nanotechnology and the Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Itamar Willner
- The Center for Nanoscience and Nanotechnology and the Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
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194
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Reddy B, Elibol OH, Nair PR, Dorvel BR, Butler F, Ahsan Z, Bergstrom DE, Alam MA, Bashir R. Silicon field effect transistors as dual-use sensor-heater hybrids. Anal Chem 2011; 83:888-95. [PMID: 21214189 PMCID: PMC3059398 DOI: 10.1021/ac102566f] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We demonstrate the temperature mediated applications of a previously proposed novel localized dielectric heating method on the surface of dual purpose silicon field effect transistor (FET) sensor-heaters and perform modeling and characterization of the underlying mechanisms. The FETs are first shown to operate as electrical sensors via sensitivity to changes in pH in ionic fluids. The same devices are then demonstrated as highly localized heaters via investigation of experimental heating profiles and comparison to simulation results. These results offer further insight into the heating mechanism and help determine the spatial resolution of the technique. Two important biosensor platform applications spanning different temperature ranges are then demonstrated: a localized heat-mediated DNA exchange reaction and a method for dense selective functionalization of probe molecules via the heat catalyzed complete desorption and reattachment of chemical functionalization to the transistor surfaces. Our results show that the use of silicon transistors can be extended beyond electrical switching and field-effect sensing to performing localized temperature controlled chemical reactions on the transistor itself.
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Affiliation(s)
- Bobby Reddy
- Micro and Nano Technology Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801
- Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801
| | - Oguz H. Elibol
- Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907
| | - Pradeep R. Nair
- Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907
| | - Brian R. Dorvel
- Micro and Nano Technology Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801
| | - Felice Butler
- Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, IN 47907
| | - Zahab Ahsan
- Micro and Nano Technology Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801
| | - Donald E. Bergstrom
- Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, IN 47907
| | - Muhammad A. Alam
- Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907
| | - Rashid Bashir
- Micro and Nano Technology Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801
- Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801
- Department of Bioengineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801
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195
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Kaufmann M, Jia Y, Werner C, Pompe T. Weakly coupled lipid bilayer membranes on multistimuli-responsive poly(N-isopropylacrylamide) copolymer cushions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:513-516. [PMID: 21158389 DOI: 10.1021/la103954y] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Polymer-cushioned lipid bilayers are frequently used to mimic the native environment of cellular membranes in respect to the extracellular matrix and intracellular structures. With the aim to actively tune lipid membrane characteristics, we pursue the approach to use temperature and pH responsive polymer thin films of poly(N-isopropylacrylamide-co-carboxyacrylamide) (PNIPAAm-co-carboxyAAM) as cushions for supported lipid bilayers. A cationic lipid bilayer composed of dioleoylphosphatidylcholine (DOPC) and dioleoyltrimethylammoniumpropane (DOTAP) (9:1) was formed on top of the polymer thin film in a drying/rehydration process. Fluorescence recovery after photobleaching (FRAP) yielded higher lipid diffusion coefficients (6.3-9.6 μm(2) s(-1)) on polymer cushions in comparison to solid glass supports (3.0-5.9 μm(2) s(-1)). No correlation of the lipid mobility was found with the swelling state of (PNIPAAm-co-carboxyAAM), which is ascribed to restrained interfacial electrostatic interactions and dispersion forces. The results revealed a minimal coupling of the lipid bilayer with the polymer cushions, and thus, bilayers supported by (PNIPAAm-co-carboxyAAM) provide interesting opportunities for unperturbed lipid diffusion combined with control of transmembrane protein mobility due to the impact of a tunable frictional drag.
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Affiliation(s)
- Martin Kaufmann
- Leibniz Institute of Polymer Research Dresden, Hohe Str. 6, 01069 Dresden, Germany
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196
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Yu Q, Li X, Zhang Y, Yuan L, Zhao T, Chen H. The synergistic effects of stimuli-responsive polymers with nano- structured surfaces: wettability and protein adsorption. RSC Adv 2011. [DOI: 10.1039/c1ra00201e] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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197
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Wang H, Wang L, Wang X, Xu J, Luo Q, Liu J. Self-assembled nanostructures from C60-containing supramolecular complex: its stimuli-responsive reversible transition and biological antioxidative capacity. NEW J CHEM 2011. [DOI: 10.1039/c1nj20568d] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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198
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Yu Q, Chen H, Zhang Y, Yuan L, Zhao T, Li X, Wang H. pH-reversible, high-capacity binding of proteins on a substrate with nanostructure. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:17812-17815. [PMID: 21038872 DOI: 10.1021/la103647s] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
In this letter, a pH-switchable system for protein adsorption and release is introduced. By combining the pH sensitivity of poly(methacrylic acid) (poly(MAA) chains and the nanoeffects of 3D nanostructured silicon nanowire arrays (SiNWAs), a poly(MAA)-modified SiNWAs material showed an extremely high capacity for binding lysozyme at pH 4 (an ∼80-fold increase compared with that of smooth Si-poly(MAA)). Moreover, ∼90% of the adsorbed lysozyme was released from SiNWAs-poly(MAA) by increasing the pH from 4 to 9, without a loss of enzyme activity.
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Affiliation(s)
- Qian Yu
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, PR China
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199
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Idota N, Nagase K, Tanaka K, Okano T, Annaka M. Stereoregulation of thermoresponsive polymer brushes by surface-initiated living radical polymerization and the effect of tacticity on surface wettability. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:17781-17784. [PMID: 21038851 DOI: 10.1021/la1024229] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
In this study, stereocontrolled poly(N-isopropylacrylamide) (PIPAAm) brushes were grafted from surfaces by atom transfer radical polymerization (ATRP) in the presence of a Lewis acid, and the effect of PIPAAm brush tacticity on the thermoresponsive wettabiliy was investigated. PIPAAm grafted by ATRP in the presence of Y(OTf)(3) showed high isotacticity, while the control brush polymerized in the absence of Y(OTf)(3) was clearly atactic. The isotacticity and molecular weight of PIPAAm brushes were controlled by polymerization conditions. The wettability of isotactic PIPAAm-grafted surfaces decreased slightly below 10 °C, although the phase transition temperature of atactic surface was 30 °C, and the bulk isotactic polymer was water-insoluble between 5 and 45 °C.
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Affiliation(s)
- Naokazu Idota
- Department of Chemistry, Faculty of Science, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan
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200
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Ivanov AE, Solodukhina N, Wahlgren M, Nilsson L, Vikhrov AA, Nikitin MP, Orlov AV, Nikitin PI, Kuzimenkova MV, Zubov VP. Reversible conformational transitions of a polymer brush containing boronic acid and its interaction with mucin glycoprotein. Macromol Biosci 2010; 11:275-84. [PMID: 21136536 DOI: 10.1002/mabi.201000295] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2010] [Revised: 09/09/2010] [Indexed: 11/06/2022]
Abstract
Reversible changes of the height of a polymer brush containing phenylboronic acid were studied. The polymer brush thickness underwent reversible changes of 0.5-1 nm, in response to the changes in composition of the contacting aqueous phase from deionized water to bicarbonate buffer and vice versa, apparently due to the conformational transition of the weak polyelectrolyte to the more extended electrically charged state. Adsorption of mucin glycoprotein to the polymer brush took place due to boronate/sugar interactions between the glycoprotein and the graft copolymer and resulted in further increase of the brush height by ca. 1.5 nm, as observed by means of spectral correlation spectroscopy and ellipsometry.
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