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Ishihara K. Biomimetic materials based on zwitterionic polymers toward human-friendly medical devices. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2022; 23:498-524. [PMID: 36117516 PMCID: PMC9481090 DOI: 10.1080/14686996.2022.2119883] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Revised: 08/26/2022] [Accepted: 08/28/2022] [Indexed: 06/01/2023]
Abstract
This review summarizes recent research on the design of polymer material systems based on biomimetic concepts and reports on the medical devices that implement these systems. Biomolecules such as proteins, nucleic acids, and phospholipids, present in living organisms, play important roles in biological activities. These molecules are characterized by heterogenic nature with hydrophilicity and hydrophobicity, and a balance of positive and negative charges, which provide unique reaction fields, interfaces, and functionality. Incorporating these molecules into artificial systems is expected to advance material science considerably. This approach to material design is exceptionally practical for medical devices that are in contact with living organisms. Here, it is focused on zwitterionic polymers with intramolecularly balanced charges and introduce examples of their applications in medical devices. Their unique properties make these polymers potential surface modification materials to enhance the performance and safety of conventional medical devices. This review discusses these devices; moreover, new surface technologies have been summarized for developing human-friendly medical devices using zwitterionic polymers in the cardiovascular, cerebrovascular, orthopedic, and ophthalmology fields.
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Affiliation(s)
- Kazuhiko Ishihara
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, Osaka, Japan
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2
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Lorusso E, Feng Y, Schneider J, Kamps L, Parasothy N, Mayer‐Gall T, Gutmann JS, Ali W. Investigation of aminolysis routes on PET fabrics using different amine‐based materials. NANO SELECT 2021. [DOI: 10.1002/nano.202100121] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Affiliation(s)
- Emanuela Lorusso
- Deutsches Textilforschungszentrum Nord‐West ÖP GmbH Adlerstr. 1 Krefeld 47798 Germany
- Department of Physical Chemistry and Center of Nanointegration (CENIDE) University of Duisburg‐Essen Universitätsstr. 2 Essen 45141 Germany
| | - Ying Feng
- Department of Physical Chemistry and Center of Nanointegration (CENIDE) University of Duisburg‐Essen Universitätsstr. 2 Essen 45141 Germany
| | - Jessica Schneider
- Deutsches Textilforschungszentrum Nord‐West gGmbH Adlerstr. 1 Krefeld 47798 Germany
| | - Leonie Kamps
- Deutsches Textilforschungszentrum Nord‐West gGmbH Adlerstr. 1 Krefeld 47798 Germany
| | - Nirtharsan Parasothy
- Department of Physical Chemistry and Center of Nanointegration (CENIDE) University of Duisburg‐Essen Universitätsstr. 2 Essen 45141 Germany
| | - Thomas Mayer‐Gall
- Deutsches Textilforschungszentrum Nord‐West ÖP GmbH Adlerstr. 1 Krefeld 47798 Germany
- Deutsches Textilforschungszentrum Nord‐West gGmbH Adlerstr. 1 Krefeld 47798 Germany
| | - Jochen S. Gutmann
- Deutsches Textilforschungszentrum Nord‐West ÖP GmbH Adlerstr. 1 Krefeld 47798 Germany
- Department of Physical Chemistry and Center of Nanointegration (CENIDE) University of Duisburg‐Essen Universitätsstr. 2 Essen 45141 Germany
- Deutsches Textilforschungszentrum Nord‐West gGmbH Adlerstr. 1 Krefeld 47798 Germany
| | - Wael Ali
- Deutsches Textilforschungszentrum Nord‐West ÖP GmbH Adlerstr. 1 Krefeld 47798 Germany
- Deutsches Textilforschungszentrum Nord‐West gGmbH Adlerstr. 1 Krefeld 47798 Germany
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3
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Shallcross RC, Olthof S, Meerholz K, Armstrong NR. Impact of Titanium Dioxide Surface Defects on the Interfacial Composition and Energetics of Evaporated Perovskite Active Layers. ACS APPLIED MATERIALS & INTERFACES 2019; 11:32500-32508. [PMID: 31390181 DOI: 10.1021/acsami.9b09935] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
This investigation elucidates critical Brønsted and Lewis acid-base interactions at the titanium dioxide (TiO2) surface that control the interfacial composition and, thus, the energetics of vacuum-processed methylammonium lead iodide (MAPbI3) perovskite active layers (PALs). In situ photoelectron spectroscopy analysis shows that interfacial growth, chemical composition, and energetics of co-deposited methylammonium iodide (MAI)/PbI2 thin films are significantly different on bare and (3-aminopropyl)triethoxysilane (APTES)-functionalized TiO2 surfaces. Mass spectroscopy analysis indicates that MAI dissociates into hydrogen iodide and methylamine in the gas phase and suggests that MAPbI3 nucleation is preceded by adsorption and coupling of these volatile MAI precursors. Prior to MAPbI3 nucleation on the bare TiO2 surface, we suggest that high coverages of methylamine adsorbed to surface defect sites (e.g., undercoordinated Ti atoms and hydroxyls) promote island-like growth of large, PbI2-rich nuclei that inhibit nucleation and lead to a thick substoichiometric interface layer that impedes charge transport and collection energetics. APTES functional groups passivate TiO2 surface defects and facilitate more conformal growth of small, PbI2-rich nuclei that enhance MAPbI3 nucleation and significantly improve interfacial energetics for charge transport and extraction. This work highlights the considerable influence of TiO2 surface chemistry on PAL composition and energetics, which are critical factors that impact the performance and long stability of these materials in emerging photovoltaic device technologies.
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Affiliation(s)
- R Clayton Shallcross
- Department of Chemistry and Biochemistry , University of Arizona , Tucson , Arizona 85721 , United States
| | - Selina Olthof
- Department of Chemistry , University of Cologne , Luxemburger Str. 116 , 50939 Cologne , Germany
| | - Klaus Meerholz
- Department of Chemistry , University of Cologne , Luxemburger Str. 116 , 50939 Cologne , Germany
| | - Neal R Armstrong
- Department of Chemistry and Biochemistry , University of Arizona , Tucson , Arizona 85721 , United States
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4
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Physicochemical characterization of albumin immobilized on different TiO2 surfaces for use in implant materials. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2018.12.028] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Wang WY, Kala K, Wei TC. Solvent-Dependent Adhesion Strength of Electroless Deposited Ni-P Layer on an Amino-Terminated Silane Compound-Modified Si Wafer. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:13597-13602. [PMID: 30350707 DOI: 10.1021/acs.langmuir.8b01927] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Amino-terminated silane compound modification was wet-processed on a silicon wafer using four different solvents to investigate the property of the self-assembled monolayer (SAM) and its influence on the adhesion of electroless deposited nickel-phosphorus (Ni-P) films. Analyzed by various tools including dynamic light scattering, the atomic force microscope, X-ray photoelectron spectroscopy, inductively coupled plasma with mass spectroscopy, a proper link between the processing solvent and SAM quality is established. It is found that at least the chemical compatibility, the polarity, and the acidity of solvents can affect the final morphology of the resultant SAM. Unlike toluene and ethanol that are most frequently chosen in literature, we conclude that isopropyl alcohol (IPA) is a superior solvent for amino-terminated silane compounds. Owing to the good SAM quality formed in IPA, the adhesion of electroless deposited Ni-P films is largely strengthened, even as high as the bulk strength of silicon wafers.
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Affiliation(s)
- Wei-Yen Wang
- Department of Chemical Engineering , National Tsing-Hua University , 300 Hsinchu , Taiwan
| | - Kannankutty Kala
- Department of Chemical Engineering , National Tsing-Hua University , 300 Hsinchu , Taiwan
| | - Tzu-Chien Wei
- Department of Chemical Engineering , National Tsing-Hua University , 300 Hsinchu , Taiwan
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6
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Zhao C, Yang J, Jiang B. Rational design of hierarchical macroporous–mesoporous magnesium silicate for highly efficient removal of organic dye and Pb2+. RSC Adv 2017. [DOI: 10.1039/c7ra08766g] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Magnesium silicate with a hierarchical macroporous–mesoporous nanostructure favours the mass transportation of pollutants and exhibits excellent removal performance for methylene blue and Pb2+.
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Affiliation(s)
- Chaoxia Zhao
- College of Chemistry
- Sichuan University
- Chengdu 610064
- China
| | - Jie Yang
- College of Chemistry
- Sichuan University
- Chengdu 610064
- China
| | - Bo Jiang
- College of Chemistry
- Sichuan University
- Chengdu 610064
- China
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Ashraf KM, Giri D, Wynne KJ, Higgins DA, Collinson MM. Cooperative Effects in Aligned and Opposed Multicomponent Charge Gradients Containing Strongly Acidic, Weakly Acidic, and Basic Functional Groups. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:3836-3847. [PMID: 27073019 DOI: 10.1021/acs.langmuir.6b00638] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Bifunctionalized surface charge gradients in which the individual component gradients either align with or oppose each other have been prepared. The multicomponent gradients contain strongly acidic, weakly acidic, and basic functionalities that cooperatively interact to define surface wettability, nanoparticle binding, and surface charge. The two-step process for gradient formation begins by modifying a siloxane coated silicon wafer in a spatially dependent fashion first with an aminoalkoxysilane and then with a mercapto-functionalized alkoxysilane. Immersion in hydrogen peroxide leads to oxidation of the surface immobilized sulfhydryl groups and subsequent protonation of the surface immobilized amines. Very different surface chemistries were obtained from gradients that either align with or oppose each other. X-ray photoelectron spectroscopy (XPS) data show that the degree of amine group protonation depends on the local concentration of sulfonate groups, which form ion pairs with the resulting ammonium ions. Contact angle measurements show that these ion pairs greatly enhance the wettability of the gradient surface. Finally, studies of colloidal gold binding show that the presence of both amine and thiol moieties enhance colloid binding, which is also influenced by surface charge. Cooperativity is also revealed in the distribution of charges on uniform samples used as models of the gradient surfaces, as evaluated via zeta potential measurements. Most significantly, the net surface charge and how it changes with distance and solution pH strongly depend on whether the gradients in amine and thiol align or oppose each other. The aligned multicomponent gradients show the most interesting behavior in that there appears to be a point at pH ∼ 6.5 where surface charge remains constant with distance. Setting the pH above or below this transition point leads to changes in the direction of charge variation along the length of the substrate.
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Affiliation(s)
- Kayesh M Ashraf
- Department of Chemistry, Virginia Commonwealth University , Richmond, Virginia 23284-2006, United States
| | - Dipak Giri
- Department of Chemistry, Kansas State University , Manhattan, Kansas 66506-0401, United States
| | - Kenneth J Wynne
- Department of Chemical and Life Science Engineering, Virginia Commonwealth University , Richmond, Virginia 23284, United States
| | - Daniel A Higgins
- Department of Chemistry, Kansas State University , Manhattan, Kansas 66506-0401, United States
| | - Maryanne M Collinson
- Department of Chemistry, Virginia Commonwealth University , Richmond, Virginia 23284-2006, United States
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8
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Fischer T, Dietrich PM, Unger WES, Rurack K. Multimode Surface Functional Group Determination: Combining Steady-State and Time-Resolved Fluorescence with X-ray Photoelectron Spectroscopy and Absorption Measurements for Absolute Quantification. Anal Chem 2016; 88:1210-7. [DOI: 10.1021/acs.analchem.5b03468] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tobias Fischer
- Bundesanstalt für Materialforschung und −prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany
| | - Paul M. Dietrich
- Bundesanstalt für Materialforschung und −prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany
| | - Wolfgang E. S. Unger
- Bundesanstalt für Materialforschung und −prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany
| | - Knut Rurack
- Bundesanstalt für Materialforschung und −prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany
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9
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D'Sa RA, Raj J, Dickinson PJ, McMahon MAS, McDowell DA, Meenan BJ. Protein, cell and bacterial response to atmospheric pressure plasma grafted hyaluronic acid on poly(methylmethacrylate). JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2015; 26:260. [PMID: 26449450 DOI: 10.1007/s10856-015-5586-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Accepted: 09/25/2015] [Indexed: 06/05/2023]
Abstract
Hyaluronic acid (HA) has been immobilised on poly(methyl methacrylate) (PMMA) surfaces using a novel dielectric barrier discharge (DBD) plasma process for the purposes of repelling protein, cellular and bacterial adhesion in the context of improving the performance of ophthalmic devices. Grafting was achieved by the following steps: (1) treatment of the PMMA with a DBD plasma operating at atmospheric pressure, (2) amine functionalisation of the activated polymer surface by exposure to a 3-aminopropyltrimethoxysilane (APTMS) linker molecule and (3) reaction of HA with the surface bound amine. The mechanism and effectiveness of the grafting process was verified by surface analysis. XPS data indicates that the APTMS linker molecule binds to PMMA via the Si-O chemistry and has the required pendant amine moiety. The carboxylic acid moiety on HA then binds with this -NH2 group via standard carbodiimide chemistry. ToF-SIMS confirms the presence of a coherent HA layer the microstructure of which is verified by AFM. The plasma grafted HA coating surfaces showed a pronounced decrease in protein and cellular adhesion when tested with bovine serum albumin and human corneal epithelial cells, respectively. The ability of these coatings to resist bacterial adhesion was established using Staphylococcus aureus NTC8325. Interestingly, the coatings did not repel bacterial adhesion, indicating that the mechanism of adhesion of bacterial cells is different to that for the surface interactions of mammalian cells. It is proposed that this difference is a consequence of the specific HA conformation that occurs under the conditions employed here. Hence, it is apparent that the microstructure/architecture of the HA coatings is an important factor in fabricating surfaces intended to repel proteins, mammalian and bacterial cells.
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Affiliation(s)
- Raechelle A D'Sa
- Centre for Materials and Structures, University of Liverpool, Brownlow Hill, Liverpool, L69 3GH, UK.
- Nanotechnology and Integrated Bio-Engineering Centre (NIBEC), University of Ulster, Shore Road, Newtownabbey, BT37 0QB, UK.
| | - Jog Raj
- Nanotechnology and Integrated Bio-Engineering Centre (NIBEC), University of Ulster, Shore Road, Newtownabbey, BT37 0QB, UK
| | - Peter J Dickinson
- Nanotechnology and Integrated Bio-Engineering Centre (NIBEC), University of Ulster, Shore Road, Newtownabbey, BT37 0QB, UK
| | - M Ann S McMahon
- Biomedical Sciences Research Institute, School of Heath Sciences, University of Ulster, Shore Road, Newtownabbey, BT37 0QB, UK
| | - David A McDowell
- Biomedical Sciences Research Institute, School of Heath Sciences, University of Ulster, Shore Road, Newtownabbey, BT37 0QB, UK
| | - Brian J Meenan
- Nanotechnology and Integrated Bio-Engineering Centre (NIBEC), University of Ulster, Shore Road, Newtownabbey, BT37 0QB, UK
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10
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Guada M, Sebastián V, Irusta S, Feijoó E, Dios-Viéitez MDC, Blanco-Prieto MJ. Lipid nanoparticles for cyclosporine A administration: development, characterization, and in vitro evaluation of their immunosuppression activity. Int J Nanomedicine 2015; 10:6541-53. [PMID: 26527872 PMCID: PMC4621240 DOI: 10.2147/ijn.s90849] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Cyclosporine A (CsA) is an immunosuppressant commonly used in transplantation for prevention of organ rejection as well as in the treatment of several autoimmune disorders. Although commercial formulations are available, they have some stability, bioavailability, and toxicity related problems. Some of these issues are associated with the drug or excipients and others with the dosage forms. With the aim of overcoming these drawbacks, lipid nanoparticles (LN) have been proposed as an alternative, since excipients are biocompatible and also a large amount of surfactants and organic solvents can be avoided. CsA was successfully incorporated into LN using the method of hot homogenization followed by ultrasonication. Three different formulations were optimized for CsA oral administration, using different surfactants: Tween(®) 80, phosphatidylcholine, taurocholate and Pluronic(®) F127 (either alone or mixtures). Freshly prepared Precirol nanoparticles showed mean sizes with a narrow size distribution ranging from 121 to 202 nm, and after freeze-drying were between 163 and 270 nm, depending on the stabilizer used. Surface charge was negative in all LN developed. High CsA entrapment efficiency of approximately 100% was achieved. Transmission electron microscopy was used to study the morphology of the optimized LN. Also, the crystallinity of the nanoparticles was studied by X-ray powder diffraction and differential scanning calorimetry. The presence of the drug in LN surfaces was confirmed by X-ray photoelectron spectroscopy. The CsA LN developed preserved their physicochemical properties for 3 months when stored at 4°C. Moreover, when the stabilizer system was composed of two surfactants, the LN formulations were also stable at room temperature. Finally, the new CsA formulations showed in vitro dose-dependent immuno-suppressive effects caused by the inhibition of IL-2 levels secreted from stimulated Jurkat cells. The findings obtained in this paper suggest that new lipid nanosystems are a good alternative to produce physicochemically stable CsA formulations for oral administration.
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Affiliation(s)
- Melissa Guada
- Department of Pharmacy and Pharmaceutical Technology, School of Pharmacy, University of Navarra, Pamplona ; Instituto de Investigación Sanitaria de Navarra, IdiSNA, Pamplona
| | - Victor Sebastián
- Chemical and Environmental Engineering Department and Nanoscience Institute of Aragon, University of Zaragoza, Zaragoza ; Networking Research Center on Bioengineering, Biomaterials and Nanomedicine, CIBER-BBN, Madrid, Spain
| | - Silvia Irusta
- Chemical and Environmental Engineering Department and Nanoscience Institute of Aragon, University of Zaragoza, Zaragoza ; Networking Research Center on Bioengineering, Biomaterials and Nanomedicine, CIBER-BBN, Madrid, Spain
| | - Esperanza Feijoó
- Department of Pharmacy and Pharmaceutical Technology, School of Pharmacy, University of Navarra, Pamplona
| | | | - María José Blanco-Prieto
- Department of Pharmacy and Pharmaceutical Technology, School of Pharmacy, University of Navarra, Pamplona ; Instituto de Investigación Sanitaria de Navarra, IdiSNA, Pamplona
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Mahapatro A. Bio-functional nano-coatings on metallic biomaterials. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2015; 55:227-51. [DOI: 10.1016/j.msec.2015.05.018] [Citation(s) in RCA: 81] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2014] [Revised: 03/20/2015] [Accepted: 05/07/2015] [Indexed: 11/28/2022]
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12
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Murugan P, Krishnamurthy M, Jaisankar SN, Samanta D, Mandal AB. Controlled decoration of the surface with macromolecules: polymerization on a self-assembled monolayer (SAM). Chem Soc Rev 2015; 44:3212-43. [PMID: 25839067 DOI: 10.1039/c4cs00378k] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Polymer functionalized surfaces are important components of various sensors, solar cells and molecular electronic devices. In this context, the use of self-assembled monolayer (SAM) formation and subsequent reactions on the surface have attracted a lot of interest due to its stability, reliability and excellent control over orientation of functional groups. The chemical reactions to be employed on a SAM must ensure an effective functional group conversion while the reaction conditions must be mild enough to retain the structural integrity. This synthetic constraint has no universal solution; specific strategies such as "graft from", "graft to", "graft through" or "direct" immobilization approaches are employed depending on the nature of the substrate, polymer and its area of applications. We have reviewed current developments in the methodology of immobilization of a polymer in the first part of the article. Special emphasis has been given to the merits and demerits of certain methods. Another issue concerns the utility - demonstrated or perceived - of conjugated or non-conjugated macromolecules anchored on a functionally decorated SAM in the areas of material science and biotechnology. In the last part of the review article, we looked at the collective research efforts towards SAM-based polymer devices and identified major pointers of progress (236 references).
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Affiliation(s)
- P Murugan
- Polymer Division, Council of Scientific and Industrial Research (CSIR)-CLRI, Adyar, Chennai-600020, India.
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13
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Fischer T, Dietrich PM, Streeck C, Ray S, Nutsch A, Shard A, Beckhoff B, Unger WES, Rurack K. Quantification of Variable Functional-Group Densities of Mixed-Silane Monolayers on Surfaces via a Dual-Mode Fluorescence and XPS Label. Anal Chem 2015; 87:2685-92. [DOI: 10.1021/ac503850f] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Tobias Fischer
- Division
1.9 Chemical and Optical Sensing, BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Strasse 11, 12489 Berlin, Germany
| | - Paul M. Dietrich
- Division
6.8 Surface Analysis and Interfacial Chemistry, BAM Federal Institute for Materials Research and Testing, Unter den Eichen 44-46, 12203 Berlin, Germany
| | - Cornelia Streeck
- X-ray
and IR Spectrometry Group, Physikalisch-Technische Bundesanstalt PTB, Abbestrasse
2-12, 10587 Berlin, Germany
| | - Santanu Ray
- Surface
and Nanoanalysis Group, Analytical Science Division, National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, United Kingdom
| | - Andreas Nutsch
- X-ray
and IR Spectrometry Group, Physikalisch-Technische Bundesanstalt PTB, Abbestrasse
2-12, 10587 Berlin, Germany
| | - Alex Shard
- Surface
and Nanoanalysis Group, Analytical Science Division, National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, United Kingdom
| | - Burkhard Beckhoff
- X-ray
and IR Spectrometry Group, Physikalisch-Technische Bundesanstalt PTB, Abbestrasse
2-12, 10587 Berlin, Germany
| | - Wolfgang E. S. Unger
- Division
6.8 Surface Analysis and Interfacial Chemistry, BAM Federal Institute for Materials Research and Testing, Unter den Eichen 44-46, 12203 Berlin, Germany
| | - Knut Rurack
- Division
1.9 Chemical and Optical Sensing, BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Strasse 11, 12489 Berlin, Germany
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14
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Azoz S, Exarhos AL, Marquez A, Gilbertson LM, Nejati S, Cha JJ, Zimmerman JB, Kikkawa JM, Pfefferle LD. Highly conductive single-walled carbon nanotube thin film preparation by direct alignment on substrates from water dispersions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:1155-1163. [PMID: 25547120 DOI: 10.1021/la503919u] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A safe, scalable method for producing highly conductive aligned films of single-walled carbon nanotubes (SWNTs) from water suspensions is presented. While microfluidic assembly of SWNTs has received significant attention, achieving desirable SWNT dispersion and morphology in fluids without an insulating surfactant or toxic superacid is challenging. We present a method that uniquely produces a noncorrosive ink that can be directly applied to a device in situ, which is different from previous fabrication techniques. Functionalized SWNTs (f-SWNTs) are dispersed in an aqueous urea solution to leverage binding between the amine group of urea and the carboxylic acid group of f-SWNTs and obtain urea-SWNT. Compared with SWNTs dispersed using conventional methods (e.g., superacid and surfactants), the dispersed urea-SWNT aggregates have a higher aspect ratio with a rodlike morphology as measured by light scattering. The Mayer rod technique is used to prepare urea-SWNT, highly aligned films (two-dimensional nematic order parameter of 0.6, 5 μm spot size, via polarized Raman) with resistance values as low as 15-1700 Ω/sq in a transmittance range of 2-80% at 550 nm. These values compete with the best literature values for conductivity of SWNT-enabled thin films. The findings offer promising opportunities for industrial applications relying on highly conductive thin SWNT films.
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Affiliation(s)
- Seyla Azoz
- Department of Chemical and Environmental Engineering, Yale University , New Haven, Connecticut 06511, United States
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15
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Mindemark J, Sun B, Brandell D. Hydroxyl-functionalized poly(trimethylene carbonate) electrolytes for 3D-electrode configurations. Polym Chem 2015. [DOI: 10.1039/c5py00446b] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Hydrogen-bonding hydroxyl side groups in a polycarbonate solid polymer electrolyte lead to improved surface adhesion and enable the application of thin, conformal electrolyte films onto complex 3D-structured electrode substrates.
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Affiliation(s)
- J. Mindemark
- Department of Chemistry – Ångström Laboratory
- Uppsala University
- SE-751 21 Uppsala
- Sweden
| | - B. Sun
- Department of Chemistry – Ångström Laboratory
- Uppsala University
- SE-751 21 Uppsala
- Sweden
| | - D. Brandell
- Department of Chemistry – Ångström Laboratory
- Uppsala University
- SE-751 21 Uppsala
- Sweden
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16
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Gandhiraman RP, Nordlund D, Jayan V, Meyyappan M, Koehne JE. Scalable low-cost fabrication of disposable paper sensors for DNA detection. ACS APPLIED MATERIALS & INTERFACES 2014; 6:22751-22760. [PMID: 25423585 PMCID: PMC4278686 DOI: 10.1021/am5069003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/07/2014] [Accepted: 11/25/2014] [Indexed: 06/04/2023]
Abstract
Controlled integration of features that enhance the analytical performance of a sensor chip is a challenging task in the development of paper sensors. A critical issue in the fabrication of low-cost biosensor chips is the activation of the device surface in a reliable and controllable manner compatible with large-scale production. Here, we report stable, well-adherent, and repeatable site-selective deposition of bioreactive amine functionalities and biorepellant polyethylene glycol-like (PEG) functionalities on paper sensors by aerosol-assisted, atmospheric-pressure, plasma-enhanced chemical vapor deposition. This approach requires only 20 s of deposition time, compared to previous reports on cellulose functionalization, which takes hours. A detailed analysis of the near-edge X-ray absorption fine structure (NEXAFS) and its sensitivity to the local electronic structure of the carbon and nitrogen functionalities. σ*, π*, and Rydberg transitions in C and N K-edges are presented. Application of the plasma-processed paper sensors in DNA detection is also demonstrated.
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Affiliation(s)
- Ram P. Gandhiraman
- NASA Ames Research Center, Moffett
Field, California 94035, United States
| | - Dennis Nordlund
- Stanford Synchrotron Radiation Lightsource, SLAC National
Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Vivek Jayan
- NASA Ames Research Center, Moffett
Field, California 94035, United States
| | - M. Meyyappan
- NASA Ames Research Center, Moffett
Field, California 94035, United States
| | - Jessica E. Koehne
- NASA Ames Research Center, Moffett
Field, California 94035, United States
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Ko YG, Lee HJ, Kim JY, Choi US. Hierarchically porous aminosilica monolith as a CO2 adsorbent. ACS APPLIED MATERIALS & INTERFACES 2014; 6:12988-12996. [PMID: 25017002 DOI: 10.1021/am5029022] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A facile strategy is successfully developed for the centimeter-scale preparation of hierarchically porous aminosilica monolith as a CO2 adsorbent just by simple processes of solvent-evaporation-induced coating, self-assembly, and concentration of tetraethyl orthosilicate sol on the surface of a polymer foam template without any adhesive composite material or hydrothermal treatment. (3-Aminopropyl) trimethoxysilane is immobilized on the surface of silica monolith via a gas-phase procedure. The silica frameworks of the monolith mimic those of the polymer foam template at the macroscale, and the frameworks are composed of the SBA-15 structure at the nanoscale. The hierarchically porous structure demonstrates improved properties over the single-mode porous component, with the macroporous framework ensuring mechanical stability and good mass transport properties, while the smaller pores provide the functionality for CO2 adsorption.
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Affiliation(s)
- Young Gun Ko
- Environmental Radioactivity Assessment Team, Korea Atomic Energy Research Institute , 989-111 Daedeok-daero, Yuseong-gu, Daejeon 305-353, Korea
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18
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Chen L, Yang B, Zhang J. Design and evaluation of a mixed monolayer consisting of alkylsilane and novel crown-type molecules. RSC Adv 2014. [DOI: 10.1039/c3ra45690k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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19
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Rastegar AJ, Vosgueritchian M, Doll JC, Mallon JR, Pruitt BL. Nanomechanical actuation of a silicon cantilever using an azo dye, self-assembled monolayer. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:7118-7124. [PMID: 23663108 DOI: 10.1021/la3034676] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The emerging fields of nanomotors and optomechanics are based on the harnessing of light to generate force. However, our ability to detect small surface stresses is limited by temperature drift, environmental noise, and low-frequency flicker electronic noise. To address these limitations, we functionalized microfabricated silicon cantilevers with an azo dye, silane-based self-assembled monolayer and modulated the surface stress by exciting the optical switch with a 405-nm laser. Atomic force microscopy, contact angle analysis, ellipsometry, and X-ray photoelectron spectroscopy verified successful assembly of molecules on the cantilever. Ultraviolet and visible spectra demonstrate optical switching of the synthesized molecule in solution. By turning the laser on and off at a specific rate (e.g., 1 Hz), the cantilever deflection can be measured via Fourier techniques, thus separating the signal of interest from the noise. This technique empowers the design of highly sensitive surface stress measurements.
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Affiliation(s)
- A Joseph Rastegar
- Department of Mechanical Engineering, Stanford University, Stanford, California 94305, USA
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20
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Ko YG, Lee HJ, Oh HC, Choi US. Amines immobilized double-walled silica nanotubes for CO2 capture. JOURNAL OF HAZARDOUS MATERIALS 2013; 250-251:53-60. [PMID: 23434479 DOI: 10.1016/j.jhazmat.2013.01.035] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2012] [Revised: 12/31/2012] [Accepted: 01/11/2013] [Indexed: 06/01/2023]
Abstract
Novel silica support has been required for high amine loading and good CO2 molecule diffusion into its pores to increase the performance of CO2 adsorbents. Herein, amine groups supported on double-walled silica nanotubes (DWSNTs) have been prepared via the immobilization of various aminosilanes (primary, secondary, tertiary, di-, and tri-aminosilanes) on DWSNT, and found to be a very effective adsorbent for CO2 capture. Amine groups immobilized DWSNTs captured CO2 reversibly in a temperature swing process at various adsorption temperatures (25°C, 50°C, 75°C, and 100°C). The amines on modified DWSNTs showed high CO2 capture capacity in the order of tri-, di-, primary, secondary, and tertiary amines. The CO2 capture capacity of all aminosilanes immobilized DWSNTs decreased linearly with the increase of the adsorption temperature. We expect that DWSNT would be able to inspire researchers to use it not only as a support for CO2 capture but also as a promising candidate for various applications.
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Affiliation(s)
- Young Gun Ko
- Center for Urban Energy Systems, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul 136-791, Republic of Korea
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21
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Zhu Y, Li Z, Chen M, Cooper HM, (Max) Lu GQ, Xu ZP. One-pot preparation of highly fluorescent cadmium telluride/cadmium sulfide quantum dots under neutral-pH condition for biological applications. J Colloid Interface Sci 2013; 390:3-10. [DOI: 10.1016/j.jcis.2012.08.003] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2012] [Revised: 07/24/2012] [Accepted: 08/01/2012] [Indexed: 01/03/2023]
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22
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Liu L, Song S, Zhang P. Formation of amino-terminated self-assembled monolayers from long-chain aminomethoxylsilanes. SURF INTERFACE ANAL 2012. [DOI: 10.1002/sia.5197] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Lei Liu
- Institute of Pharmaceutics; Henan University; Kaifeng 475004 P. R. China
| | - Shiyong Song
- Institute of Pharmaceutics; Henan University; Kaifeng 475004 P. R. China
- Key lab for Special Functional Materials of Ministry of Education; Kaifeng Henan China
| | - Pingyu Zhang
- Key lab for Special Functional Materials of Ministry of Education; Kaifeng Henan China
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Bose RK, Nejati S, Stufflet DR, Lau KKS. Graft Polymerization of Anti-Fouling PEO Surfaces by Liquid-Free Initiated Chemical Vapor Deposition. Macromolecules 2012. [DOI: 10.1021/ma301234z] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Ranjita K. Bose
- Department
of Chemical and Biological Engineering, Drexel University, 3141 Chestnut Street, Philadelphia,
Pennsylvania 19104, United States
| | - Siamak Nejati
- Department
of Chemical and Biological Engineering, Drexel University, 3141 Chestnut Street, Philadelphia,
Pennsylvania 19104, United States
| | - David R. Stufflet
- Department
of Chemical and Biological Engineering, Drexel University, 3141 Chestnut Street, Philadelphia,
Pennsylvania 19104, United States
| | - Kenneth K. S. Lau
- Department
of Chemical and Biological Engineering, Drexel University, 3141 Chestnut Street, Philadelphia,
Pennsylvania 19104, United States
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24
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Chu Q, Luo P, Zhao Q, Feng J, Kuang X, Wang D. Application of a new family of organosilicon quadripolymer as a fluid loss additive for drilling fluid at high temperature. J Appl Polym Sci 2012. [DOI: 10.1002/app.38096] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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25
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Rahim MA, Islam MS, Bae TS, Choi WS, Noh YY, Lee HJ. Metal ion-enriched polyelectrolyte complexes and their utilization in multilayer assembly and catalytic nanocomposite films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:8486-8495. [PMID: 22571380 DOI: 10.1021/la300674t] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The mixing of Ag ion-doped poly(ethyleneimine) (PEI) and poly(acrylic acid) (PAA) produced Ag ion-doped polyelectrolyte complex particles (PECs) in solution. Positively charged Ag ion-doped PECs (Ag ion PECs) with a spherical shape were deposited alternatively with PAA to form a multilayer assembly. The multilayered film containing Ag ion PECs was reduced to generate a composite nanostructure. Metal nanoparticle (NP)-enriched nanocomposite films were formed by an additional process of the postadsorption of precursors on PECs within the nanocomposite films, which resulted in the enhancement of the catalytic and electrical properties of the composite films. Because the films contain PECs that are responsive to changes in pH and most of the NPs are embedded in the PECs, interesting catalytic properties, which are unexpected in a particle-type catalyst, were observed upon pH changes. As a result of the reversible structural changes of the films and the immobilization of the NPs within the films, the film-type catalysts showed enhanced performance and stability during catalytic reactions under various pH conditions, compared to particle-type catalysts.
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Affiliation(s)
- Md Arifur Rahim
- Jeonju Center, Korea Basic Science Institute, 664-14 Dukjin-dong 1-ga, Dukjin-gu, Jeonju 561-756, Republic of Korea
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Yang J, Yuan P, Chen HY, Zou J, Yuan Z, Yu C. Rationally designed functional macroporous materials as new adsorbents for efficient phosphorus removal. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm16681j] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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27
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Ko YG, Shin SS, Choi US. Primary, secondary, and tertiary amines for CO2 capture: designing for mesoporous CO2 adsorbents. J Colloid Interface Sci 2011; 361:594-602. [PMID: 21708387 DOI: 10.1016/j.jcis.2011.03.045] [Citation(s) in RCA: 88] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2010] [Revised: 03/07/2011] [Accepted: 03/11/2011] [Indexed: 10/18/2022]
Abstract
CO(2) emissions, from fossil-fuel-burning power plants, the breathing, etc., influence the global worming on large scale and the man's work efficiency on small scale. The reversible capture of CO(2) is a prominent feature of CO(2) organic-inorganic hybrid adsorbent to sequester CO(2). Herein, (3-aminopropyl) trimethoxysilane (APTMS), [3-(methylamino)propyl] trimethoxysilane (MAPTMS), and [3-(diethylamino) propyl] trimethoxysilane (DEAPTMS) are immobilized on highly ordered mesoporous silicas (SBA-15) to catch CO(2) as primary, secondary, and tertiary aminosilica adsorbents. X-ray photoelectron spectroscopy was used to analyze the immobilized APTMS, MAPTMS, and DEAPTMS on the SBA-15. We report an interesting discovery that the CO(2) adsorption and desorption on the adsorbent depend on the amine type of the aminosilica adsorbent. The adsorbed CO(2) was easily desorbed from the adsorbent with the low energy consumption in the order of tertiary, secondary, and primary amino-adsorbents while the adsorption amount and the bonding-affinity increased in the reverse order. The effectiveness of amino-functionalized (1(o), 2(o), and 3(o) amines) SBA-15s as a CO(2) capturing agent was investigated in terms of adsorption capacity, adsorption-desorption kinetics, and thermodynamics. This work demonstrates apt amine types to catch CO(2) and regenerate the adsorbent, which may open new avenues to designing "CO(2) basket".
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Affiliation(s)
- Young Gun Ko
- Energy Mechanics Center, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Wolsong-gil 5, Seongbuk-gu, Seoul 136-791, Republic of Korea
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Liang YQ, Cui ZD, Zhu SL, Yang XJ. Characterization of self-organized TiO2 nanotubes on Ti-4Zr-22Nb-2Sn alloys and the application in drug delivery system. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2011; 22:461-467. [PMID: 21287247 DOI: 10.1007/s10856-011-4234-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2010] [Accepted: 01/11/2011] [Indexed: 05/30/2023]
Abstract
In this study, the self-organized TiO(2) nanotubes grown by anodization of Ti-4Zr-22Nb-2Sn at different potentials, concentration of NH(4)F and anodization time was investigated. The morphology of nanotubes was observed by FE-SEM. The drug-loaded nanotubes were also fabricated in aqueous media containing minocycline hydrochloride. They were characterized by SEM, XPS and FT-IR. The results showed that the drug of minocycline hydrochloride (MH) was loaded in the nanotubes. The release effects were studied in phosphate buffer solution (PBS). The release rate of MH from TiO(2) nanotubes with shorter tube length in PBS was lower than the one of MH from longer nanotubes. The sustaining release time could last at least 150 h. Hence, it is a promising method to eliminate the harmful reactions by carrying drug in the tubes when the titanium alloys were used as biomedical implants.
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Affiliation(s)
- Y Q Liang
- School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China
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Dietrich PM, Graf N, Gross T, Lippitz A, Schüpbach B, Bashir A, Wöll C, Terfort A, Unger WES. Self-assembled monolayers of aromatic omega-aminothiols on gold: surface chemistry and reactivity. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:3949-3954. [PMID: 20041682 DOI: 10.1021/la903293b] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Amino-terminated self-assembled monolayers on gold substrates were studied by X-ray photoelectron spectroscopy (XPS), near-edge X-ray absorption fine structure (NEXAFS) measurements, and atomic force microscopy (AFM). Two different omega-amino-4,4'-terphenyl substituted alkanethiols of the general structure H(2)N-(C(6)H(4))(3)-(CH(2))(n)-SH (ATPn) were used: 2-(4''-amino-1,1':4',1''-terphenyl-4-yl)ethane-1-thiol (n = 2, ATP2) and 3-(4''-amino-1,1':4',1''-terphenyl-4-yl)propane-1-thiol (n = 3, ATP3). Moreover, the addressability of amino groups within the films was investigated by chemical derivatization of ATPn SAMs with 3,5-bis(trifluoromethyl)phenyl isothiocyanate (ITC) forming fluorinated thiourea ATPn-F films. Evaluation of high-resolution C 1s and N 1s XPS data revealed successful derivatization of at least 50% of surface amino species. Furthermore, it could be demonstrated by angle-resolved NEXAFS spectroscopy that chemical derivatization with ITC has no noticeable influence on the preferential upright orientation of the molecules in the SAMs.
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Affiliation(s)
- Paul M Dietrich
- BAM Bundesanstalt für Materialforschung und -prüfung, D-12203 Berlin, Germany
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Wang S, Zhu Y. Facile method to prepare smooth and homogeneous polymer brush surfaces of varied brush thickness and grafting density. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:13448-55. [PMID: 19863074 DOI: 10.1021/la901785t] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
This Article describes a facile method to prepare smooth and homogeneous polymer brush surfaces of variable grafting density from a solid surface by combining Langmuir-Blodgett (LB) deposition with surface-initiated atom transfer radical polymerization (SI-ATRP). This method is successfully demonstrated by the preparation of thermoresponsive poly(N-isopropylacrylamide) (PNIPAM) brush surfaces on smooth silicon and quartz substrates. With the custom-synthesized inert diluent whose chemical structure, except end-functionality, is the same as that of the reactive initiator, smooth and chemically homogeneous mixed monolayers of initiators and inert diluents are immobilized on a solid surface by LB deposition, allowing the further variation of the grafting density of PNIPAM brushes grafted from the initiator monolayers of varied initiator coverage. With the optimized molar ratio of deactivator, Cu(II) in the Cu(I)-ligand catalyst complex, the brush thickness of PNIPAM brushes at varied grafting density is controlled to grow nearly linearly with reaction time while smoothness and chemical homogeneity of PNIPAM brushes are achieved. For the demonstrated PNIPAM brush surfaces, the thermoresponsive characteristics of PNIPAM brushes are also verified. This combined LB-ATRP method can be applied to graft a variety of polymer brushes, including polyelectrolytes and block copolymers, from different solid substrates.
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Affiliation(s)
- Shengqin Wang
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, USA
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Li JR, Lusker KL, Yu JJ, Garno JC. Engineering the spatial selectivity of surfaces at the nanoscale using particle lithography combined with vapor deposition of organosilanes. ACS NANO 2009; 3:2023-2035. [PMID: 19572752 DOI: 10.1021/nn9004796] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Particle lithography is a practical approach to generate millions of organosilane nanostructures on various surfaces, without the need for vacuum environments or expensive instrumentation. This report describes a stepwise chemistry route to prepare organosilane nanostructures and then apply the patterns as a spatially selective foundation to attach gold nanoparticles. Sites with thiol terminal groups were sufficiently small to localize the attachment of clusters of 2-5 nanoparticles. Basic steps such as centrifuging, drying, heating, and rinsing were used to generate arrays of regular nanopatterns. Close-packed films of monodisperse latex spheres can be used as an evaporative mask to spatially direct the placement of nanoscopic amounts of water on surfaces. Vapor phase organosilanes deposit selectively at areas of the surface containing water residues to generate nanostructures with regular thickness, geometry, and periodicity as revealed in atomic force microscopy images. The area of contact underneath the mesospheres is effectively masked for later synthetic steps, providing exquisite control of surface coverage and local chemistry. By judicious selection in designing the terminal groups of organosilanes, surface sites can be engineered at the nanoscale for building more complex structures. The density of the nanopatterns and surface coverage scale predictably with the diameter of the mesoparticle masks. The examples presented definitively illustrate the capabilities of using the chemistry of molecularly thin films of organosilanes to spatially define the selectivity of surfaces at very small size scales.
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Affiliation(s)
- Jie-Ren Li
- Department of Chemistry and the Center for BioModular Multi-Scale Systems, Louisiana State University, 232 Choppin Hall, Baton Rouge, Louisiana 70803
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Lu MD, Yang SM. Synthesis of poly(3-hexylthiophene) grafted TiO2 nanotube composite. J Colloid Interface Sci 2009; 333:128-34. [DOI: 10.1016/j.jcis.2009.01.073] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2008] [Revised: 01/21/2009] [Accepted: 01/30/2009] [Indexed: 10/21/2022]
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Wong AKY, Krull UJ. Surfaces for tuning of oligonucleotide biosensing selectivity based on surface-initiated atom transfer radical polymerization on glass and silicon substrates. Anal Chim Acta 2009; 639:1-12. [PMID: 19345752 DOI: 10.1016/j.aca.2009.03.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2008] [Revised: 03/03/2009] [Accepted: 03/03/2009] [Indexed: 11/19/2022]
Abstract
Covalently immobilized mixed films of oligonucleotide and oligomer components on glass and silicon surfaces are reported. This work has investigated how such films can improve selectivity for the detection of multiple base-pair mismatches. The intention was to introduce a "matrix isolation" effect on oligonucleotide probe molecules by surrounding the probes with oligomers, thereby reducing oligonucleotide-to-oligonucleotide and/or oligonucleotide-to-surface interactions. Thiol-functionalized oligonucleotide was coupled onto (3-aminopropyl)trimethoxysilane (APTMS) via a heterobifunctional linker, succinimidyl 4-[N-maleimidomethyl]cyclohexane-1-carboxylate (sulfo-SMCC). Using a variety of monomers such as 2-hydroxyethyl methacrylate (HEMA), oligomers were grown by surface-initiated atom transfer radical polymerization (ATRP) from a bromoisobutyryl NHS ester initiator which was immobilized onto APTMS sites that coated glass and oxidized silicon substrates. Various surface modification steps on silicon substrates were characterized by ellipsometry, wettability, atomic force microscopy, X-ray photoelectron spectroscopy, and time-of-flight secondary ion mass spectrometry. Polymerized HEMA (PHEMA) in mixture with oligonucleotide probes was evaluated for fluorescence transduction of hybridization. The presence of PHEMA was found to provide a sharper melt curve for hybrids containing both fully complementary and three base-pair mismatched targets, and this surface derivatization also minimized non-selective adsorption. The maximum increase in slope was improvement by a factor of 3-fold. An increase of up to 30% in difference of melting temperatures between fully complementary and 3 base-pair mismatched targets was achieved using PHEMA. The results suggest that the presence of oligomers dispersed among DNA hybrids can improve selectivity through what is believed to be a reduction of dispersity of interactions of probes with targets, and probes within their local environment at a surface.
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Affiliation(s)
- April K Y Wong
- Chemical Sensors Group, University of Toronto Mississauga, 3359 Mississauga Rd. N., Mississauga, ON, Canada L5L 1C6
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Park JJ, Lacerda SHDP, Stanley SK, Vogel BM, Kim S, Douglas JF, Raghavan D, Karim A. Langmuir adsorption study of the interaction of CdSe/ZnS quantum dots with model substrates: influence of substrate surface chemistry and pH. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:443-450. [PMID: 19053491 DOI: 10.1021/la802324c] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We investigate the utility of Langmuir adsorption measurements for characterizing nanoparticle-substrate interactions. Spherical CdSe/ZnS core-shell nanoparticles were chosen as representative particles because of their widespread use in biological labeling measurements and their relatively monodisperse dimensions. In particular, the quantum dots were functionalized with 11-mercaptoundecanoic acid, and we utilized an amine-terminated self-assembled monolayer (SAM) as a model substrate. SAMs with different end-groups (-CH(3) and -COOH) were also considered to contrast with the adsorption behavior on the amine-terminated SAM substrates. We followed the kinetics of nanoparticle adsorption on the aminosilane layer by quartz crystal microgravimetry (QCM) over a range of particle concentrations and determined the corresponding Langmuir adsorption isotherms. Analysis of both equilibrium adsorption and kinetic adsorption data allowed us to determine a consistent value of the Langmuir adsorption equilibrium constant for the amine-terminated SAM at room temperature (K(L) approximately 2.7 (micromol/L)(-1)), providing a useful characterization of the nanoparticle-substrate interaction. The effect of varying solution pH on Langmuir adsorption was also investigated in order to gain insight into the role of electrostatic interactions on nanoparticle adsorption. The equilibrium extent of adsorption was found to be maximum at about pH 7. These changes of nanoparticle adsorption were further quantified and validated by X-ray photoelectron spectroscopy (XPS) and confocal fluorescence microscopy measurements. We conclude that Langmuir adsorption measurements provide a promising approach for quantifying nanoparticle-substrate interactions.
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Affiliation(s)
- Jung Jin Park
- Polymers Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
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Adamczyk NM, Dameron AA, George SM. Molecular layer deposition of poly(p-phenylene terephthalamide) films using terephthaloyl chloride and p-phenylenediamine. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:2081-9. [PMID: 18215079 DOI: 10.1021/la7025279] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Ultrathin polymer films can be fabricated using the gas-phase method known as molecular layer deposition. This process typically uses bifunctional monomers in a sequential, self-limiting reaction sequence to grow conformal polymer films with molecular layer control. In this study, terephthaloyl chloride (TC) and p-phenylenediamine (PD) were used as the bifunctional monomers to deposit poly(p-phenylene terephthalamide) (PPTA) thin films. 3-Aminopropyl trimethoxysilane or ethanolamine was used to prepare amine-terminated surfaces prior to the PPTA MLD. The surface chemistry and growth rate during PPTA MLD at 145 degrees C were studied using in situ transmission Fourier transform infrared (FTIR) spectroscopy experiments on high surface area powders of SiO2 particles. PPTA MLD thin film growth at 145 degrees C was also examined using in situ transmission FTIR experiments on flat KBr substrates with an amine-terminated Al2O3 ALD overlayer. The integrated absorbances of the N-H and amide I stretching vibrations were measured and used to estimate the thin film thickness. X-ray reflectivity (XRR) experiments were also employed to measure the film thickness after PPTA MLD at 145 degrees C and 180 degrees C. The experiments revealed that the TC and PD reactions displayed self-limiting surface chemistry. The surface species alternated with sequential TC and PD exposures and the PPTA MLD films grew continuously. However, the growth rates per MLD cycle at 145 degrees C were less than expectations based on the size of the molecules involved in the reaction chemistry and were variable between 0.5 and 4.0 A per TC/PD reaction cycle. The lower growth rates are explained by the growth of a limited number of polymer chains on the substrate. The variability in the growth rate is attributed to the difficulties with the bifunctional monomer precursors. Alternative surface chemistries for polymer MLD are proposed that would avoid the use of bifunctional monomers.
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Affiliation(s)
- N M Adamczyk
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309, USA
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Sunding MF, Jensen IT, Stenstad PM, Diplas S. ARXPS and high energy XPS characterisation of titanium surfaces for medical implants. SURF INTERFACE ANAL 2008. [DOI: 10.1002/sia.2778] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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