1
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Chang CY, Yang JR, Liu YS, Panda A. Facile surface functionalization of triboelectric layers via electrostatically self-assembled zwitterionic molecules for achieving efficient and stable antibacterial flexible triboelectric nanogenerators. MATERIALS HORIZONS 2024; 11:646-660. [PMID: 38063132 DOI: 10.1039/d3mh01529g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2024]
Abstract
Manipulation of the surface properties of the triboelectric layer has been proven to be one of the key parameters to achieve high-performance and stable triboelectric nanogenerators (TENG). Herein, a pragmatic surface engineering strategy that can substantially boost the performance and stability of flexible TENG is elaborated by incorporating the zwitterionic molecule dimethylethylammoniumpropane sulfonate (NDSB) as the surface modification layer. Given that zwitterionic molecules tend to form aggregated structures, realizing ordered arrangement on the substrate surface remains challenging to date. To address this issue, in this work, a combination of multiple surface treatments and molecular manipulation strategy is proposed. Our results prove that NDSB is effective in modifying the surface properties of the dielectric layer and electrode layer, leading to a remarkable power density and specific power of 2.86 W m-2 and 20.73 mW g-1 for flexible TENG, respectively. In addition, due to the strong interaction between the NDSB/dielectric and NDSB/electrode, a water-resistant long-term stable flexible TENG is realized. More encouragingly, our strategy is compatible with a cost-effective dip-coating technique, and an unprecedented demonstration of batch fabrication of TENG using NDSB to functionalize the surface of the dielectric layer and electrode layer synchronously can be realized, which is advantageous for rapid and up-scalable manufacturing of TENG. We also prove that the TENG based on zwitterionic materials reveals exceptional antibacterial properties against Escherichia coli. This study represents an important step towards the development of long-term stable flexible TENG that possesses a high output performance and excellent antibacterial activity based on a facile and economical strategy, enabling TENG technology to show bright prospects in a wide variety of application domains.
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Affiliation(s)
- Chih-Yu Chang
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei, 10607, Taiwan (R.O.C.).
| | - Jia-Ruei Yang
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei, 10607, Taiwan (R.O.C.).
| | - Yi-Shan Liu
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei, 10607, Taiwan (R.O.C.).
| | - Abhisek Panda
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei, 10607, Taiwan (R.O.C.).
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2
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Doveri L, Taglietti A, Grisoli P, Pallavicini P, Dacarro G. Dual mode antibacterial surfaces based on Prussian blue and silver nanoparticles. Dalton Trans 2023; 52:452-460. [PMID: 36525102 DOI: 10.1039/d2dt03058f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Prussian Blue (PB) is an inexpensive, biocompatible, photothermally active material. In this paper, self-assembled monolayers of PB nanoparticles were grafted on a glass surface, protected with a thin layer of silica and decorated with spherical silver nanoparticles. This combination of a photothermally active nanomaterial, PB, and an intrinsically antibacterial one, silver, leads to a versatile coating that can be used for medical devices and implants. The intrinsic antibacterial action of nanosilver, always active over time, can be enhanced on demand by switching on the photothermal effect of PB using near infrared (NIR) radiation, which has a good penetration depth through tissues and low side effects. Glass surfaces functionalized by this layer-by-layer approach have been characterized for their morphology and composition, and their intrinsic and photothermal antibacterial effect was studied against Gram+ and Gram- planktonic bacteria.
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Affiliation(s)
- Lavinia Doveri
- University of Pavia - Department of Chemistry and Center for Health Technologies; Via Taramelli 12, I-27100 Pavia, Italy.
| | - Angelo Taglietti
- University of Pavia - Department of Chemistry and Center for Health Technologies; Via Taramelli 12, I-27100 Pavia, Italy.
| | - Pietro Grisoli
- University of Pavia - Department of Drug Science; Via Taramelli 12, I-27100 Pavia, Italy
| | - Piersandro Pallavicini
- University of Pavia - Department of Chemistry and Center for Health Technologies; Via Taramelli 12, I-27100 Pavia, Italy.
| | - Giacomo Dacarro
- University of Pavia - Department of Chemistry and Center for Health Technologies; Via Taramelli 12, I-27100 Pavia, Italy.
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3
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Rouvière L, Al-Hajj N, Hunel J, Aupetit C, Buffeteau T, Vellutini L, Genin E. Silane-Based SAMs Deposited by Spin Coating as a Versatile Alternative Process to Solution Immersion. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:6464-6471. [PMID: 35544953 DOI: 10.1021/acs.langmuir.2c00668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Functionalization of silica surfaces with silane-based self-assembled monolayers (SAMs) is widely used in material sciences to tune surface properties and introduce terminal functional groups enabling subsequent chemical surface reactions and immobilization of (bio)molecules. Here, we report on the synthesis of four organotrimethoxysilanes with various molecular structures and we compare their grafting by spin coating with the one performed by the conventional solution immersion method. Strikingly, this study clearly demonstrates that the spin coating technique is a versatile, fast, and more convenient alternative process to prepare robust, smooth, and homogeneous SAMs with similar properties and quality as those deposited via immersion. SAMs were characterized by PM-IRRAS, AFM, and wettability measurements. SAMs can undergo several chemical surface modifications, and the reactivity of amine-terminated SAM was confirmed by PM-IRRAS and fluorescence measurements.
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Affiliation(s)
- Lisa Rouvière
- Université Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
| | - Nisreen Al-Hajj
- Université Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
- Department of Chemistry, Faculty of Science, An-Najah National University, P.O. Box 7, 400 Nablus, Palestine
| | - Julien Hunel
- Université Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
| | - Christian Aupetit
- Université Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
| | - Thierry Buffeteau
- Université Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
| | - Luc Vellutini
- Université Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
| | - Emilie Genin
- Université Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
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4
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Gunckel R, Koo B, Xu Y, Lin WJ, Hall A, Chattopadhyay A, Dai LL. Stress-Responsive Reinforced Polymer Composites via Functionalization of Glass Fibers. Ind Eng Chem Res 2021. [DOI: 10.1021/acs.iecr.1c02214] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Ryan Gunckel
- School for Engineering of Matter, Transport and Energy, Arizona State University, 551 East Tyler Mall, Tempe, Arizona 85287, United States
| | - Bonsung Koo
- School for Engineering of Matter, Transport and Energy, Arizona State University, 551 East Tyler Mall, Tempe, Arizona 85287, United States
| | - Yifei Xu
- School for Engineering of Matter, Transport and Energy, Arizona State University, 551 East Tyler Mall, Tempe, Arizona 85287, United States
| | - Wendy J. Lin
- School for Engineering of Matter, Transport and Energy, Arizona State University, 551 East Tyler Mall, Tempe, Arizona 85287, United States
| | - Asha Hall
- The U.S. Army Research Laboratory, Aberdeen Proving Ground, Maryland 21005, United States
| | - Aditi Chattopadhyay
- School for Engineering of Matter, Transport and Energy, Arizona State University, 551 East Tyler Mall, Tempe, Arizona 85287, United States
| | - Lenore L. Dai
- School for Engineering of Matter, Transport and Energy, Arizona State University, 551 East Tyler Mall, Tempe, Arizona 85287, United States
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5
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Beter J, Maroh B, Schrittesser B, Mühlbacher I, Griesser T, Schlögl S, Fuchs PF, Pinter G. Tailored Interfaces in Fiber-Reinforced Elastomers: A Surface Treatment Study on Optimized Load Coupling via the Modified Fiber Bundle Debond Technique. Polymers (Basel) 2020; 13:polym13010036. [PMID: 33374154 PMCID: PMC7795769 DOI: 10.3390/polym13010036] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Revised: 12/18/2020] [Accepted: 12/22/2020] [Indexed: 01/20/2023] Open
Abstract
The interface between the reinforcement and surrounding matrix in a fibrous composite is decisive and critical for maintaining component performance, durability, and mechanical structure properties for load coupling assessment, especially for highly flexible composite materials. The clear trend towards tailored solutions reveals that an in-depth knowledge on surface treating methods to enhance the fiber–matrix interfacial interaction and adhesion properties for an optimized load transfer needs to be ensured. This research aims to quantify the effect of several surface treatments for glass fibers applied in endless fiber-reinforced elastomers with pronounced high deformations. Due to this, the glass fiber surface is directly modified with selected sizings, using a wet chemical treatment, and characterized according to chemical and mechanical aspects. For this purpose, the interfacial adhesion performance between fibers and the surrounding matrix material is investigated by a modified fiber pull-out device. The results clearly show that an optimized surface treatment improves the interface strength and chemical bonding significantly. The fiber pull-out test confirms that an optimized fiber–matrix interface can be enhanced up to 85% compared to standard surface modifications, which distinctly provides the basis of enhanced performances on the component level. These findings were validated by chemical analysis methods and corresponding optical damage analysis.
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Affiliation(s)
- Julia Beter
- Polymer Competence Center Leoben GmbH, Roseggerstrasse 12, 8700 Leoben, Austria; (B.M.); (B.S.); (I.M.); (S.S.); (P.F.F.)
- Correspondence: ; Tel.: +43-3842-42962-31
| | - Boris Maroh
- Polymer Competence Center Leoben GmbH, Roseggerstrasse 12, 8700 Leoben, Austria; (B.M.); (B.S.); (I.M.); (S.S.); (P.F.F.)
| | - Bernd Schrittesser
- Polymer Competence Center Leoben GmbH, Roseggerstrasse 12, 8700 Leoben, Austria; (B.M.); (B.S.); (I.M.); (S.S.); (P.F.F.)
| | - Inge Mühlbacher
- Polymer Competence Center Leoben GmbH, Roseggerstrasse 12, 8700 Leoben, Austria; (B.M.); (B.S.); (I.M.); (S.S.); (P.F.F.)
| | - Thomas Griesser
- Chair of Chemistry of Polymeric Materials, Montanuniversitaet Leoben, Otto-Gloeckel Strasse 2, 8700 Leoben, Austria;
| | - Sandra Schlögl
- Polymer Competence Center Leoben GmbH, Roseggerstrasse 12, 8700 Leoben, Austria; (B.M.); (B.S.); (I.M.); (S.S.); (P.F.F.)
| | - Peter Filipp Fuchs
- Polymer Competence Center Leoben GmbH, Roseggerstrasse 12, 8700 Leoben, Austria; (B.M.); (B.S.); (I.M.); (S.S.); (P.F.F.)
| | - Gerald Pinter
- Department of Polymer Engineering and Science, Montanuniversitaet Leoben, Otto-Gloeckel Strasse 2, 8700 Leoben, Austria;
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6
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Fang JS, Yang TM, Pan YC, Lai GY, Cheng YL, Chen GS. Chemical-Structure Evolution Model for the Self-Assembling of Amine-Terminated Monolayers on Nanoporous Carbon-Doped Organosilicate in Tightly Controlled Environments. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:15153-15161. [PMID: 33270454 DOI: 10.1021/acs.langmuir.0c02801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Amine-terminated self-assembled monolayers are molecular nanolayers, typically formed via wet-chemical solution on specific substrates for precision surface engineering or interface modification. However, homogeneous assembling of a highly ordered monolayer by the facile, wet method is rather tricky because it involves process parameters, such as solvent type, molecular concentration, soaking time and temperature, and humidity level. Here, we select 3-aminopropyltrimethoxysilane (APTMS) as a model molecule of aminosilane for the silanization of nanoporous carbon-doped organosilicate (p-SiOCH) under tightly controlled process environments. Surface mean roughness (Ra) and the water contact angle (θ) of the p-SiOCH layers upon silanization at a 10% humidity-controlled environment behave similarly and follow a three-stage evolution: a leap to a maximum at 15 min for Ra (from 0.227 to 0.411 nm) and θ (from 25 to 86°), followed by a gradual decrease to 0.225 nm and 69o, finally leveling off at the above values (>60 min). The -NH3+ fraction indicating monolayer disorientation evolves in a similar fashion. The fully grown monolayer is highly oriented yielding an unprecedented low -NH3+ fraction of 0.08 (and 0.92 of upright -NH2 groups). However, while having a similar thickness of approximately 1.4 ± 0.1 nm, the molecular layers grown at 30% relative humidity exhibit a significantly elevated -NH3+ fraction of 0.42, indicating that controlling the humidity is vital to the fabrication of highly oriented APTMS molecular layers. A bonding-structure evolution model, as distinct from those offered previously, is proposed and discussed.
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Affiliation(s)
- Jau-Shiung Fang
- Department of Materials Science and Engineering, National Formosa University, Huwei, Yunlin 632, Taiwan
| | - Tzu-Ming Yang
- Department of Materials Science and Engineering, Feng Chia University, Seatwen, Taichung 40724, Taiwan
| | - Yen-Chang Pan
- Department of Materials Science and Engineering, Feng Chia University, Seatwen, Taichung 40724, Taiwan
| | - Guan-Yu Lai
- Department of Materials Science and Engineering, Feng Chia University, Seatwen, Taichung 40724, Taiwan
| | - Yi-Lung Cheng
- Department of Electrical Engineering, National Chi-Nan University, Puli, Nantou 54561, Taiwan
| | - Giin-Shan Chen
- Department of Materials Science and Engineering, Feng Chia University, Seatwen, Taichung 40724, Taiwan
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7
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Fu T, Xing H, Silver ES, Itoh Y, Chen S, Masuda T, Uosaki K, Huang F, Aida T. Anomalously Slow Conformational Change Dynamics of Polar Groups Anchored to Hydrophobic Surfaces in Aqueous Media. Chem Asian J 2020; 15:3321-3325. [PMID: 32844601 DOI: 10.1002/asia.202000742] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Revised: 08/21/2020] [Indexed: 11/11/2022]
Abstract
Water molecules within a thin hydration layer, spontaneously generated on hydrophobic protein surfaces, are reported to form a poorly dynamic network structure. However, how such a water network affects the conformational change dynamics of polar groups has never been explored, although such polar groups play a critical role in protein-protein and protein-ligand interactions. In the present work, we utilized as model protein surfaces a series of self-assembled monolayers (SAMs) appended with polar (Fmoc) or ionic (FITC) fluorescent head groups that were tethered via a 1.5-nm-long flexible oligoether chain to a hydrophobic silicon wafer surface, which was densely covered with paraffinic chains. We found that, not only in deionized water but also in aqueous buffer, these oligoether-appended head groups at ambient temperatures both displayed an anomalously slow conformational change, which required ∼10 h to reach a thermodynamically equilibrated state. We suppose that these behaviors reflect the poorly dynamic and low-permittivity natures of the thin hydration layer.
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Affiliation(s)
- Tengfei Fu
- Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Hao Xing
- Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan.,State Key Laboratory of Chemical Engineering, Center for Chemistry of High-Performance & Novel Materials, Department of Chemistry, Zhejiang University, Hangzhou, 310027, P. R. China
| | - Eric S Silver
- Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Yoshimitsu Itoh
- Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Shuo Chen
- Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Takuya Masuda
- Research Center for Advanced Measurement and Characterization, National Institute for Materials Science (NIMS) Tsukuba, Ibaraki, 305-0044, Japan.,Global Research Center for Environment and Energy based on Nanomaterials Science (GREEN), National Institute for Materials Science (NIMS) Tsukuba, Ibaraki, 305-0044, Japan
| | - Kohei Uosaki
- Global Research Center for Environment and Energy based on Nanomaterials Science (GREEN), National Institute for Materials Science (NIMS) Tsukuba, Ibaraki, 305-0044, Japan.,International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS) Tsukuba, Ibaraki, 305-0044, Japan
| | - Feihe Huang
- State Key Laboratory of Chemical Engineering, Center for Chemistry of High-Performance & Novel Materials, Department of Chemistry, Zhejiang University, Hangzhou, 310027, P. R. China
| | - Takuzo Aida
- Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan.,RIKEN Center for Emergent Matter Science, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan
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8
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Flynn Bolte KT, Balaraman RP, Jiao K, Tustison M, Kirkwood KS, Zhou C, Kohli P. Probing Liquid-Solid and Vapor-Liquid-Solid Interfaces of Hierarchical Surfaces Using High-Resolution Microscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:3720-3730. [PMID: 29486565 DOI: 10.1021/acs.langmuir.8b00298] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Liquid-solid (LS) and vapor-liquid-solid (VLS) interfaces are important for the fundamental understanding of how surface chemistry impacts industrial processes and applications. Superhydrophobic surfaces, from structural hierarchies, were fabricated by coating flat smooth surfaces with hollow glass microspheres. These surfaces are referred to as structural hierarchical-modified microsphere surfaces (SHiMMs). Two-phase LS and three-phase VLS interfaces of water droplets on SHiMMs, with an apparent static contact angle (aSCA) of ∼160°, were probed at microscale using environmental scanning electron microscopy (ESEM) and high-resolution optical microscopy (OM). Both ESEM and OM confirmed the presence of air pockets in 3-150 μm range at the VLS triple-phase of the droplet peripheral contact line. The wetting characteristics of the LS interface in the interior of the water droplet were probed using energy-dispersive spectroscopy, which corroborated well with the VLS triple-phase observations, confirming the presence of both the microscale air pockets and fractional complete wetting of the SHiMMs. The superhydrophobic water droplets on the SHiMMs also exhibited relatively high adhesion to the SHiMMs-a tilt angle of 10°-40° was needed for detaching the droplets off the surfaces. Semiquantitative three-phase contact-line analysis and experimental data indicated high-water aSCA, and large adhesion on the microscale-roughened SHiMMs is attributed to pinning of the probe liquid both at the triple VLS and interior LS interfaces. The control over microroughness and surface chemistry of the SHiMMs will allow tuning of both the static and dynamic liquid-surface interactions.
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Affiliation(s)
| | | | | | | | | | | | - Punit Kohli
- Department of Chemistry and Biochemistry , Southern Illinois University , Carbondale , Illinois 62901 , United States
- Department of Materials Science and Engineering , Northwestern University , Evanston , Illinois 60201 , United States
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9
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Madsen J, Ducker RE, Al Jaf O, Cartron ML, Alswieleh AM, Smith CH, Hunter CN, Armes SP, Leggett GJ. Fabrication of microstructured binary polymer brush "corrals" with integral pH sensing for studies of proton transport in model membrane systems. Chem Sci 2018; 9:2238-2251. [PMID: 29719697 PMCID: PMC5897877 DOI: 10.1039/c7sc04424k] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2017] [Accepted: 01/14/2018] [Indexed: 11/21/2022] Open
Abstract
Binary brush structures consisting of poly(cysteine methacrylate) (PCysMA) "corrals" enclosed within poly(oligoethylene glycol methyl ether methacrylate) (POEGMA) "walls" are fabricated simply and efficiently using a two-step photochemical process. First, the C-Cl bonds of 4-(chloromethyl)phenylsilane monolayers are selectively converted into carboxylic acid groups by patterned exposure to UV light through a mask and POEGMA is grown from unmodified chlorinated regions by surface-initiated atom-transfer radical polymerisation (ATRP). Incorporation of a ratiometric fluorescent pH indicator, Nile Blue 2-(methacryloyloxy)ethyl carbamate (NBC), into the polymer brushes facilitates assessment of local changes in pH using a confocal laser scanning microscope with spectral resolution capability. Moreover, the dye label acts as a radical spin trap, enabling removal of halogen end-groups from the brushes via in situ dye addition during the polymerisation process. Second, an initiator is attached to the carboxylic acid-functionalised regions formed by UV photolysis in the patterning step, enabling growth of PCysMA brushes by ATRP. Transfer of the system to THF, a poor solvent for PCysMA, causes collapse of the PCysMA brushes. At the interface between the collapsed brush and solvent, selective derivatisation of amine groups is achieved by reaction with excess glutaraldehyde, facilitating attachment of aminobutyl(nitrile triacetic acid) (NTA). The PCysMA brush collapse is reversed on transfer to water, leaving it fully expanded but only functionalized at the brush-water interface. Following complexation of NTA with Ni2+, attachment of histidine-tagged proteorhodopsin and lipid deposition, light-activated transport of protons into the brush structure is demonstrated by measuring the ratiometric response of NBC in the POEGMA walls.
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Affiliation(s)
- J Madsen
- Department of Chemistry , University of Sheffield , Brook Hill , Sheffield S3 7HF , UK . ; ;
| | - R E Ducker
- Department of Chemistry , University of Sheffield , Brook Hill , Sheffield S3 7HF , UK . ; ;
| | - O Al Jaf
- Department of Chemistry , University of Sheffield , Brook Hill , Sheffield S3 7HF , UK . ; ;
| | - M L Cartron
- Department of Molecular Biology and Biotechnology , University of Sheffield , Western Bank , Sheffield S10 2TN , UK
| | | | - C H Smith
- Department of Chemistry , University of Sheffield , Brook Hill , Sheffield S3 7HF , UK . ; ;
| | - C N Hunter
- Department of Molecular Biology and Biotechnology , University of Sheffield , Western Bank , Sheffield S10 2TN , UK
| | - S P Armes
- Department of Chemistry , University of Sheffield , Brook Hill , Sheffield S3 7HF , UK . ; ;
| | - G J Leggett
- Department of Chemistry , University of Sheffield , Brook Hill , Sheffield S3 7HF , UK . ; ;
- Krebs Institute for Mechanistic Biology , University of Sheffield , Sheffield S10 2TN , UK
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10
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Baron M, Morris JC, Telitel S, Clément JL, Lalevée J, Morlet-Savary F, Spangenberg A, Malval JP, Soppera O, Gigmes D, Guillaneuf Y. Light-Sensitive Alkoxyamines as Versatile Spatially- and Temporally- Controlled Precursors of Alkyl Radicals and Nitroxides. J Am Chem Soc 2018; 140:3339-3344. [DOI: 10.1021/jacs.7b12807] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Marc Baron
- Aix Marseille Univ., CNRS, Institut de Chimie Radicalaire UMR 7273, Marseille 13397, France
| | - Jason C. Morris
- Aix Marseille Univ., CNRS, Institut de Chimie Radicalaire UMR 7273, Marseille 13397, France
| | - Siham Telitel
- Université de Haute-Alsace, CNRS, IS2M UMR 7361, Mulhouse F-68100, France
- Université de Strasbourg, 4 Rue Blaise Pascal, Strasbourg 67081, France
| | - Jean-Louis Clément
- Aix Marseille Univ., CNRS, Institut de Chimie Radicalaire UMR 7273, Marseille 13397, France
| | - Jacques Lalevée
- Université de Haute-Alsace, CNRS, IS2M UMR 7361, Mulhouse F-68100, France
- Université de Strasbourg, 4 Rue Blaise Pascal, Strasbourg 67081, France
| | - Fabrice Morlet-Savary
- Université de Haute-Alsace, CNRS, IS2M UMR 7361, Mulhouse F-68100, France
- Université de Strasbourg, 4 Rue Blaise Pascal, Strasbourg 67081, France
| | - Arnaud Spangenberg
- Université de Haute-Alsace, CNRS, IS2M UMR 7361, Mulhouse F-68100, France
- Université de Strasbourg, 4 Rue Blaise Pascal, Strasbourg 67081, France
| | - Jean-Pierre Malval
- Université de Haute-Alsace, CNRS, IS2M UMR 7361, Mulhouse F-68100, France
- Université de Strasbourg, 4 Rue Blaise Pascal, Strasbourg 67081, France
| | - Olivier Soppera
- Université de Haute-Alsace, CNRS, IS2M UMR 7361, Mulhouse F-68100, France
- Université de Strasbourg, 4 Rue Blaise Pascal, Strasbourg 67081, France
| | - Didier Gigmes
- Aix Marseille Univ., CNRS, Institut de Chimie Radicalaire UMR 7273, Marseille 13397, France
| | - Yohann Guillaneuf
- Aix Marseille Univ., CNRS, Institut de Chimie Radicalaire UMR 7273, Marseille 13397, France
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11
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Rangharajan KK, Mohana Sundaram P, Conlisk AT, Prakash S. Surface dependent enhancement in water vapor permeation through nanochannels. Analyst 2018; 143:4256-4266. [PMID: 30028451 DOI: 10.1039/c8an00650d] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Transmission resistance for selective water vapor permeation through hydrophobic conduits with a varying degree of surface wettability is estimated inside a nanofluidic device.
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Affiliation(s)
| | | | - A. T. Conlisk
- Department of Mechanical and Aerospace Engineering
- The Ohio State University
- Columbus
- USA
| | - Shaurya Prakash
- Department of Mechanical and Aerospace Engineering
- The Ohio State University
- Columbus
- USA
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12
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Hosseinifar A, Shariaty-Niassar M, Seyyed Ebrahimi SA, Moshref-Javadi M. Synthesis, Characterization, and Application of Partially Blocked Amine-Functionalized Magnetic Nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:14728-14737. [PMID: 29182875 DOI: 10.1021/acs.langmuir.7b02093] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
In this study, a novel technique was introduced for selective surface modification of amine-functionalized magnetic nanoparticles. The method was based on alignment of magnetic nanoparticles in an external magnetic field, which resulted in formation of chain-like assemblies in diluted suspensions. The aligned chains were then modified on the surface via reaction of isocyanate species with the particle functionalities. Finally, after removal from the reactor medium, particles with segmented distribution of surface functionalities were achieved. We named these partially blocked amine-functionalized magnetic nanoparticles as "Saturn" nanoparticles. Application of the particles in fabrication of magnetic assemblies was successfully demonstrated. Using methylene diphenyl diisocyanate (MDI) as the bridging agent, structures in different forms such as chains and filaments were produced by the Saturn particles and compared with cross-linked structures of the unmodified amine-functionalized particles. It is expected that this novel nanoparticle with its unique structure will have great potential in assembly fabrication with a variety of applications in biomedical fields.
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Affiliation(s)
- A Hosseinifar
- Transport Phenomena & Nanotechnology (TPNT) Lab., School of Chemical Engineering, College of Engineering, University of Tehran , Tehran 111554563, Iran
- Advanced Magnetic Materials Research Center, School of Metallurgy and Materials, College of Engineering, University of Tehran , Tehran 111554563, Iran
| | - M Shariaty-Niassar
- Transport Phenomena & Nanotechnology (TPNT) Lab., School of Chemical Engineering, College of Engineering, University of Tehran , Tehran 111554563, Iran
- Advanced Magnetic Materials Research Center, School of Metallurgy and Materials, College of Engineering, University of Tehran , Tehran 111554563, Iran
| | - S A Seyyed Ebrahimi
- Advanced Magnetic Materials Research Center, School of Metallurgy and Materials, College of Engineering, University of Tehran , Tehran 111554563, Iran
| | - M Moshref-Javadi
- Department of Materials Science and Engineering, Monash University , Clayton, VIC 3800, Australia
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Shanthil M, Fathima H, George Thomas K. Cost-Effective Plasmonic Platforms: Glass Capillaries Decorated with Ag@SiO 2 Nanoparticles on Inner Walls as SERS Substrates. ACS APPLIED MATERIALS & INTERFACES 2017; 9:19470-19477. [PMID: 28248484 DOI: 10.1021/acsami.6b12478] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A cost-effective method for the fabrication of a glass capillary based plasmonic platform for the selective detection and identification of analytes of importance in health, environment, and safety is demonstrated. This was achieved by coating Ag@SiO2 nanoparticles (Ag ∼ 60 nm) having silica shell of varying thickness (∼2 and ∼25 nm) on the inside walls of glass capillaries, over 2 cm in length, with uniform coverage. It was found that the particle density on the surface plays a decisive role on the enhancement of Raman signals. Multiple hot spots, which are essentially junctions of amplified electric field, were generated when ∼30 Ag@SiO2 particles/μm2 were bound onto the walls of glass capillaries. The pores of the silica shell allow the localization of analyte molecules to the vicinity of hot spots resulting in signal enhancements of the order of 1010 (using pyrene as analyte; excitation wavelength, 632.8 nm). The applicability of Ag@SiO2 coated capillaries for the detection of a wide range of molecules has been explored, by taking representative examples of polyaromatic hydrocarbons (pyrene), amino acids (tryptophan), proteins (bovine serum albumin), and explosives (trinitrotoluene). By increasing the thickness of the silica shell of Ag@SiO2 nanoparticles, an effective filtration cum detection method has been developed for the selective identification of small molecules such as amino acids, without the interference of large proteins.
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Affiliation(s)
- M Shanthil
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM) , CET Campus, Thiruvananthapuram 695 016, India
- Photosciences and Photonics, CSIR-National Institute for Interdisciplinary Science and Technology , Thiruvananthapuram 695 019, India
| | - Hemna Fathima
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM) , CET Campus, Thiruvananthapuram 695 016, India
| | - K George Thomas
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM) , CET Campus, Thiruvananthapuram 695 016, India
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Chen A, Xin X, Xu J, Bian Y, Bian Z. Cadmium ion adsorption by amine-modified activated carbon. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2017; 75:1675-1683. [PMID: 28402309 DOI: 10.2166/wst.2017.042] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Cadmium (Cd) is one of the most toxic metals found in water and sediments. In the effort to develop an effective adsorbent for aqueous Cd removal, activated carbon (AC) was modified with an amino-terminated organosilicon (3-aminopropyltrimethoxysilane, APS). Response surface methodology was used to optimize selected operational parameters of adsorption of aqueous Cd by considering a central composite design with three input variables, temperature of the mixture solution, the contact time and feed ratio (APS/AC), on the surface modification. Results demonstrated that the strong Cd-binding amine ligands were effectively introduced onto the AC surfaces through the silanol reaction between carbon surface functional groups (-COOH, -COH) and APS molecules. The optimized preparation condition is 77 °C, 4 h and 2.1 ratio. The adsorbent presented a favorable adsorption of the aqueous Cd(II).
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Affiliation(s)
- Acong Chen
- College of Water Sciences, Beijing Normal University, Beijing 100875, China E-mail:
| | - Xin Xin
- College of Water Sciences, Beijing Normal University, Beijing 100875, China E-mail:
| | - Jie Xu
- College of Water Sciences, Beijing Normal University, Beijing 100875, China E-mail:
| | - Yu Bian
- College of Water Sciences, Beijing Normal University, Beijing 100875, China E-mail:
| | - Zhaoyong Bian
- College of Water Sciences, Beijing Normal University, Beijing 100875, China E-mail:
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15
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Bussi Y, Holtzman L, Shagan A, Segal E, Mizrahi B. Light-triggered antifouling coatings for porous silicon optical transducers. POLYM ADVAN TECHNOL 2017. [DOI: 10.1002/pat.3989] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Yonit Bussi
- Department of Biotechnology and Food Engineering; Technion - Israel Institute of Technology; Haifa 32000 Israel
- Russell Berrie Nanotechnology Institute; Technion - Israel Institute of Technology; Haifa 32000 Israel
| | - Liran Holtzman
- Department of Biotechnology and Food Engineering; Technion - Israel Institute of Technology; Haifa 32000 Israel
| | - Alona Shagan
- Department of Biotechnology and Food Engineering; Technion - Israel Institute of Technology; Haifa 32000 Israel
| | - Ester Segal
- Department of Biotechnology and Food Engineering; Technion - Israel Institute of Technology; Haifa 32000 Israel
- Russell Berrie Nanotechnology Institute; Technion - Israel Institute of Technology; Haifa 32000 Israel
| | - Boaz Mizrahi
- Department of Biotechnology and Food Engineering; Technion - Israel Institute of Technology; Haifa 32000 Israel
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Wang Z, He C, Gong X, Wang J, Ngai T. Measuring the Surface-Surface Interactions Induced by Serum Proteins in a Physiological Environment. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:12129-12136. [PMID: 27794620 DOI: 10.1021/acs.langmuir.6b03420] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
In this work, we applied total internal reflection microscopy (TIRM) to directly measure the interactions between three different kinds of macroscopic surfaces: namely bare polystyrene (PS) particle and bare silica surface (bare-PS/bare-silica), PS particle and silica surfaces both coated with bovine serum albumin (BSA) (BSA-PS/BSA-silica), and PS particle and silica surfaces both modified with polyethylene glycol (PEG) (PEG-PS/PEG-silica) polymers, in phosphate buffer solution (PBS) and fetal bovine serum (FBS). Our results showed that in PBS, all the bare-PS, BSA-PS, and PEG-PS particles were irreversibly deposited onto the bare silica surface or surfaces coated either with BSA or PEG. However, in FBS, the interaction potentials between the particle and surface exhibited both free-diffusing particle and stuck particle profiles. Dynamic light scattering (DLS) and elliposmeter measurements indicated that there was a layer of serum proteins adsorbed on the PS particle and silica surface. TIRM measurement revealed that such adsorbed serum proteins can mediate the surface-surface interactions by providing additional stabilization under certain conditions, but also promoting bridging effect between the two surfaces. The measured potential profile of the stuck particle in FBS thus was much wider than in PBS. These quantitative measurements provide insights that serum proteins adsorbed onto surfaces can regulate surface-surface interactions, thus leading to unique moving behavior and stability of colloidal particles in the serum environment.
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Affiliation(s)
- Zhaohui Wang
- Department of Chemistry, The Chinese University of Hong Kong , Shatin, N.T., Hong Kong SAR, The People's Republic of China
| | - Chuanxin He
- College of Chemistry and Environmental Engineering, Shenzhen University , Shenzhen, China 518060
| | - Xiangjun Gong
- School of Materials Science and Engineering, South China University of Technology , Guangzhou, China 510640
| | - Jianqi Wang
- Department of Chemistry, The Chinese University of Hong Kong , Shatin, N.T., Hong Kong SAR, The People's Republic of China
| | - To Ngai
- Department of Chemistry, The Chinese University of Hong Kong , Shatin, N.T., Hong Kong SAR, The People's Republic of China
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Forato F, Liu H, Benoit R, Fayon F, Charlier C, Fateh A, Defontaine A, Tellier C, Talham DR, Queffélec C, Bujoli B. Comparison of Zirconium Phosphonate-Modified Surfaces for Immobilizing Phosphopeptides and Phosphate-Tagged Proteins. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:5480-5490. [PMID: 27166821 DOI: 10.1021/acs.langmuir.6b01020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Different routes for preparing zirconium phosphonate-modified surfaces for immobilizing biomolecular probes are compared. Two chemical-modification approaches were explored to form self-assembled monolayers on commercially available primary amine-functionalized slides, and the resulting surfaces were compared to well-characterized zirconium phosphonate monolayer-modified supports prepared using Langmuir-Blodgett methods. When using POCl3 as the amine phosphorylating agent followed by treatment with zirconyl chloride, the result was not a zirconium-phosphonate monolayer, as commonly assumed in the literature, but rather the process gives adsorbed zirconium oxide/hydroxide species and to a lower extent adsorbed zirconium phosphate and/or phosphonate. Reactions giving rise to these products were modeled in homogeneous-phase studies. Nevertheless, each of the three modified surfaces effectively immobilized phosphopeptides and phosphopeptide tags fused to an affinity protein. Unexpectedly, the zirconium oxide/hydroxide modified surface, formed by treating the amine-coated slides with POCl3/Zr(4+), afforded better immobilization of the peptides and proteins and efficient capture of their targets.
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Affiliation(s)
- Florian Forato
- Chimie et Interdisciplinarité: Synthèse Analyse Modélisation (CEISAM), Université de Nantes, CNRS, UMR 6230 , 2 rue de la Houssinière, BP 92208, 44322 Nantes Cedex 3, France
| | - Hao Liu
- Department of Chemistry, University of Florida , Gainesville, Florida 32611-7200, United States
| | - Roland Benoit
- CRMD-CNRS, 1B rue de la férollerie, 45071 Orléans Cedex 2, France
| | - Franck Fayon
- CNRS, CEMHTI UPR3079, Université de Orléans , F-45071 Orléans, France
| | - Cathy Charlier
- Fonctionnalité et Ingénierie des Protéines (UFIP), Université de Nantes, CNRS, UMR 6286 , 2 rue de la Houssinière BP 92208, 44322 Nantes Cedex 3, France
| | - Amina Fateh
- Fonctionnalité et Ingénierie des Protéines (UFIP), Université de Nantes, CNRS, UMR 6286 , 2 rue de la Houssinière BP 92208, 44322 Nantes Cedex 3, France
| | - Alain Defontaine
- Fonctionnalité et Ingénierie des Protéines (UFIP), Université de Nantes, CNRS, UMR 6286 , 2 rue de la Houssinière BP 92208, 44322 Nantes Cedex 3, France
| | - Charles Tellier
- Fonctionnalité et Ingénierie des Protéines (UFIP), Université de Nantes, CNRS, UMR 6286 , 2 rue de la Houssinière BP 92208, 44322 Nantes Cedex 3, France
| | - Daniel R Talham
- Department of Chemistry, University of Florida , Gainesville, Florida 32611-7200, United States
| | - Clémence Queffélec
- Chimie et Interdisciplinarité: Synthèse Analyse Modélisation (CEISAM), Université de Nantes, CNRS, UMR 6230 , 2 rue de la Houssinière, BP 92208, 44322 Nantes Cedex 3, France
| | - Bruno Bujoli
- Chimie et Interdisciplinarité: Synthèse Analyse Modélisation (CEISAM), Université de Nantes, CNRS, UMR 6230 , 2 rue de la Houssinière, BP 92208, 44322 Nantes Cedex 3, France
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18
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Khung YL, Narducci D. Surface modification strategies on mesoporous silica nanoparticles for anti-biofouling zwitterionic film grafting. Adv Colloid Interface Sci 2015; 226:166-86. [PMID: 26589704 DOI: 10.1016/j.cis.2015.10.009] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2015] [Revised: 10/21/2015] [Accepted: 10/22/2015] [Indexed: 12/23/2022]
Abstract
In the past decade, zwitterionic-based anti-biofouling layers had gained much focus as a serious alternative to traditional polyhydrophilic films such as PEG. In the area of assembling silica nanoparticles with stealth properties, the incorporation of zwitterionic surface film remains fairly new but considering that silica nanoparticles had been widely demonstrated as useful biointerfacing nanodevice, zwitterionic film grafting on silica nanoparticle holds much potential in the future. This review will discuss on the conceivable functional chemistry approaches, some of which are potentially suitable for the assembly of such stealth systems.
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19
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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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20
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Klitsche F, Ramcke J, Migenda J, Hensel A, Vossmeyer T, Weller H, Gross S, Maison W. Synthesis of tripodal catecholates and their immobilization on zinc oxide nanoparticles. Beilstein J Org Chem 2015; 11:678-86. [PMID: 26124871 PMCID: PMC4464264 DOI: 10.3762/bjoc.11.77] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2015] [Accepted: 04/27/2015] [Indexed: 11/23/2022] Open
Abstract
A common approach to generate tailored materials and nanoparticles (NPs) is the formation of molecular monolayers by chemisorption of bifunctional anchor molecules. This approach depends critically on the choice of a suitable anchor group. Recently, bifunctional catecholates, inspired by mussel-adhesive proteins (MAPs) and bacterial siderophores, have received considerable interest as anchor groups for biomedically relevant metal surfaces and nanoparticles. We report here the synthesis of new tripodal catecholates as multivalent anchor molecules for immobilization on metal surfaces and nanoparticles. The tripodal catecholates have been conjugated to various effector molecules such as PEG, a sulfobetaine and an adamantyl group. The potential of these conjugates has been demonstrated with the immobilization of tripodal catecholates on ZnO NPs. The results confirmed a high loading of tripodal PEG-catecholates on the particles and the formation of stable PEG layers in aqueous solution.
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Affiliation(s)
- Franziska Klitsche
- Department of Chemistry, University of Hamburg, Institute of Pharmaceutical and Medicinal Chemistry, Bundesstr. 45, 20146 Hamburg, Germany
| | - Julian Ramcke
- Department of Chemistry, University of Hamburg, Institute of Pharmaceutical and Medicinal Chemistry, Bundesstr. 45, 20146 Hamburg, Germany
| | - Julia Migenda
- IENI-CNR, Department of Chemical Sciences, University of Padova, INSTM, Via Marzolo 1, 35131 Padova, Italy
| | - Andreas Hensel
- Department of Chemistry, University of Hamburg, Institute of Physical Chemistry, Grindelallee 117, 20146 Hamburg, Germany
| | - Tobias Vossmeyer
- Department of Chemistry, University of Hamburg, Institute of Physical Chemistry, Grindelallee 117, 20146 Hamburg, Germany
| | - Horst Weller
- Department of Chemistry, University of Hamburg, Institute of Physical Chemistry, Grindelallee 117, 20146 Hamburg, Germany
| | - Silvia Gross
- IENI-CNR, Department of Chemical Sciences, University of Padova, INSTM, Via Marzolo 1, 35131 Padova, Italy
| | - Wolfgang Maison
- Department of Chemistry, University of Hamburg, Institute of Pharmaceutical and Medicinal Chemistry, Bundesstr. 45, 20146 Hamburg, Germany
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21
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Huang LB, Zhou Y, Han ST, Yan Y, Zhou L, Chen W, Zhou P, Chen X, Roy VAL. Controlled assembly of silver nanoparticles monolayer on 3D polymer nanotubes and their applications. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2014; 10:4645-4650. [PMID: 25087595 DOI: 10.1002/smll.201401352] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2014] [Revised: 06/19/2014] [Indexed: 06/03/2023]
Affiliation(s)
- Long-Biao Huang
- Department of Physics and Materials Science and Center of Super Diamond and Advanced Films (COSDAF), City University of Hong Kong, Hong Kong SAR
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Huang LB, Zhou Y, Han ST, Yan Y, Zhou L, Roy VAL. The role of a nanoparticle monolayer on the flow of polymer melts in nanochannels. NANOSCALE 2014; 6:11013-11018. [PMID: 25132623 DOI: 10.1039/c4nr03002h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Understanding and controlling the flow properties of polymer melts at the nanoscale is of great relevance in fundamental research and in a variety of applications. In the present study we have analysed experimentally the flow behaviour of polymers in nanochannels of varying roughness, produced by gold nanoparticle absorption. The experimental results show that nanochannel roughness has a significant influence on surface energy and on the flow behaviour of polymer melts. These results provide fundamental information on the preparation of one-dimensional polymer nanochannels applicable in both micro- and nano-injection technology.
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Affiliation(s)
- Long-Biao Huang
- Centre of Super-Diamond and Advanced Films (COSDAF), Department of Physics and Materials Science, City University of Hong Kong, Hong Kong SAR, China.
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Cao Y, Ding L, Wang S, Liu Y, Fan J, Hu W, Liu P, Fang Y. Detection and identification of Cu2+ and Hg2+ based on the cross-reactive fluorescence responses of a dansyl-functionalized film in different solvents. ACS APPLIED MATERIALS & INTERFACES 2014; 6:49-56. [PMID: 24328087 DOI: 10.1021/am405157k] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A dansyl-functionalized fluorescent film sensor was specially designed and prepared by assembling dansyl on a glass plate surface via a long flexible spacer containing oligo(oxyethylene) and amine units. The chemical attachment of dansyl moieties on the surface was verified by contact angle, XPS, and fluorescence measurements. Solvent effect examination revealed that the polarity-sensitivity was retained for the surface-confined dansyl moieties. Fluorescence quenching studies in water declared that the dansyl-functionalized SAM possesses a higher sensitivity towards Hg(2+) and Cu(2+) than the other tested divalent metal ions including Zn(2+), Cd(2+), Co(2+), and Pb(2+). Further measurements of the fluorescence responses of the film towards Cu(2+) and Hg(2+) in three solvents including water, acetonitrile, and THF evidenced that the present film exhibits cross-reactive responses to these two metal ions. The combined signals from the three solvents provide a recognition pattern for both metal ions at a certain concentration and realize the identification between Hg(2+) and Cu(2+). Moreover, using principle component analysis, this method can be extended to identify metal ions that are hard to detect by the film sensor in water such as Co(2+) and Ni(2+).
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Affiliation(s)
- Yuan Cao
- Key Laboratory of Applied Surface and Colloid Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University , Xi'an 710062, China
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Römhildt L, Pahlke C, Zörgiebel F, Braun HG, Opitz J, Baraban L, Cuniberti G. Patterned biochemical functionalization improves aptamer-based detection of unlabeled thrombin in a sandwich assay. ACS APPLIED MATERIALS & INTERFACES 2013; 5:12029-35. [PMID: 24171544 DOI: 10.1021/am4038245] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Here we propose a platform for the detection of unlabeled human α-thrombin down to the picomolar range in a fluorescence-based aptamer assay. In this concept, thrombin is captured between two different thrombin binding aptamers, TBA1 (15mer) and TBA2 (29mer), each labeled with a specific fluorescent dye. One aptamer is attached to the surface, the second one is in solution and recognizes surface-captured thrombin. To improve the limit of detection and the comparability of measurements, we employed and compared two approaches to pattern the chip substrate-microcontact printing of organosilanes onto bare glass slides, and controlled printing of the capture aptamer TBA1 in arrays onto functionalized glass substrates using a nanoplotter device. The parallel presence of functionalized and control areas acts as an internal reference. We demonstrate that both techniques enable the detection of thrombin concentrations in a wide range from 0.02 to 200 nM with a detection limit at 20 pM. Finally, the developed method could be transferred to any substrate to probe different targets that have two distinct possible receptors without the need for direct target labeling.
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Affiliation(s)
- Lotta Römhildt
- Institute for Materials Science and Max Bergmann Center of Biomaterials and §Center for Advancing Electronics Dresden, TU Dresden , 01062 Dresden, Germany
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Sergani S, Furmansky Y, Visoly-Fisher I. Metal-free molecular junctions on ITO via amino-silane binding-towards optoelectronic molecular junctions. NANOTECHNOLOGY 2013; 24:455204. [PMID: 24129428 DOI: 10.1088/0957-4484/24/45/455204] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Light control over currents in molecular junctions is desirable as a non-contact input with high spectral and spatial resolution provided by the photonic input and the molecular electronics element, respectively. Expanding the study of molecular junctions to non-metallic transparent substrates, such as indium tin oxide (ITO), is vital for the observation of molecular optoelectronic effects. Non-metallic electrodes are expected to decrease the probability of quenching of molecular photo-excited states, light-induced plasmonic effects, or significant electrode expansion under visible light. We have developed micron-sized, metal free, optically addressable ITO molecular junctions with a conductive polymer serving as the counter-electrode. The electrical transport was shown to be dominated by the nature of the self-assembled monolayer (SAM). The use of amino-silane (APTMS) as the chemical binding scheme to ITO was found to be significant in determining the transport properties of the junctions. APTMS allows high junction yields and the formation of dense molecular layers preventing electrical short. However, polar amino-silane binding to the ITO significantly decreased the conductance compared to thiol-bound SAMs, and caused tilted geometry and disorder in the molecular layer. As the effect of the molecular structure on transport properties is clearly observed in our junctions, such metal-free junctions are suitable for characterizing the optoelectronic properties of molecular junctions.
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Affiliation(s)
- S Sergani
- Department of Chemistry, Ben Gurion University of the Negev, Be'er Sheva 84105, Israel
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Upadhyay AP, Behara DK, Sharma GP, Bajpai A, Sharac N, Ragan R, Pala RGS, Sivakumar S. Generic process for highly stable metallic nanoparticle-semiconductor heterostructures via click chemistry for electro/photocatalytic applications. ACS APPLIED MATERIALS & INTERFACES 2013; 5:9554-9562. [PMID: 24018108 DOI: 10.1021/am402398h] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Metallic nanoparticles (MNP) are utilized as electrocatalysts, cocatalysts, and photon absorbers in heterostructures that harvest solar energy. In such systems, the interface formed should be stable over a wide range of pH values and electrolytes. Many current nonthermal processing strategies rely on physical interactions to bind the MNP to the semiconductor. In this work, we demonstrate a generic chemical approach for fabricating highly stable electrochemically/photocatalytically active monolayers and tailored multilayered nanoparticle structures using azide/alkyne-modified Au, TiO2, and SiO2 nanoparticles on alkyne/azide-modified silicon, indium tin oxide, titania, stainless steel, and glass substrates via click chemistry. The stability, electrical, electrochemical, and photocatalytic properties of the interface are shown via electrochemical water splitting, methanol oxidation, and photocatalytic degradation of Rhodamine B (RhB) dye. The results suggest that the proposed approach can be extended for the large-scale fabrication of highly stable heterostructure materials for electrochemical and photoelectrocatalytic devices.
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Affiliation(s)
- Arun Prakash Upadhyay
- Department of Chemical Engineering, Indian Institute of Technology Kanpur , Kanpur, Uttar Pradesh 208016, India
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McCrate JM, Ekerdt JG. Titration of free hydroxyl and strained siloxane sites on silicon dioxide with fluorescent probes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:11868-11875. [PMID: 23978272 DOI: 10.1021/la402825t] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A technique enabling the detection and quantification of low density sites on planar SiO2 surfaces is demonstrated. Fluorescent probes are used to titrate free hydroxyl and strained siloxane sites on the surface of amorphous SiO2 substrates in vacuum. The titration of free hydroxyl sites was performed to validate the method and to provide a reference for the measurement of the strained siloxane site density. Perylene derivatives with different functional groups are chemisorbed onto the surface sites, enabling in situ photoluminescence (PL) measurements of the bound fluorophores. An amine functional group is used to selectively titrate strained siloxane sites, while an alcohol group is used for the titration of free hydroxyl sites. Emission intensity was found to be nonlinear with coverage for bound fluorophore densities greater than 0.1 nm(-2), necessitating the removal of molecules from the surface into a solution to obtain accurate density measurements. For lower densities, the coverage of bound fluorophores can be estimated directly from in situ PL measurements. The measured areal densities of bound fluorophores after titrating free hydroxyl sites are in good agreement with literature values for the densities of such sites on high surface area silica. PL measurements of SiO2 surfaces titrated with an amine derivative of perylene indicate that strained siloxane sites exist for vacuum pretreatment temperatures of 300 °C and increase with increasing pretreatment temperature. Densities of strained siloxane sites on the silica surface are estimated at 0.004-0.02 nm(-2) for pretreatment temperatures of 300-700 °C, demonstrating the sensitivity of this technique.
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Affiliation(s)
- Joseph M McCrate
- Department of Chemical Engineering, The University of Texas at Austin , Austin, Texas 78712, United States
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28
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Séro L, Sanguinet L, Derbré S, Boury F, Brotons G, Dabos-Seignon S, Richomme P, Séraphin D. Fluorescent self-assembled monolayers of umbelliferone: a relationship between contact angle and fluorescence. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:10423-10431. [PMID: 23879702 DOI: 10.1021/la401536p] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Self-assembled monolayers (SAMs) that contain fluorophore units are nowadays widely used to tune surface properties and design new chemical sensor chips. It is well-known that the nature of the substrate may strongly interfere with the emission properties of the grafted molecules, but the organization of the monolayer may also have an important role. To study the influence of the SAM organization on the luminescence properties, we prepared different coumarin-based derivatives endowed with tethered chains of different lengths and elaborated the corresponding SAMs on glass slides. Besides SAM structural characterizations by atomic force microscopy and X-ray reflectivity, we carried out contact angle measurements and applied the Van Oss-Chaudhury-Good theory, which was rarely used previously for self-assembled monolayers. As expected, by increasing the tethered chain length, a higher surface coverage, a higher degree of organization, and a stronger molecular packing were observed. However, it appears to facilitate the self-quenching process, and thus, this strongly affects the fluorescent properties of the SAMs.
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Affiliation(s)
- Luc Séro
- PRES L'UNAM, Laboratoire MOLTECH-Anjou, Université d'Angers, CNRS-UMR 6200, 2 bd Lavoisier, 49045 Angers Cedex, France
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29
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Detection of Myoglobin with an Open-Cavity-Based Label-Free Photonic Crystal Biosensor. J Med Eng 2013; 2013:808056. [PMID: 27006922 PMCID: PMC4782615 DOI: 10.1155/2013/808056] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2012] [Revised: 04/28/2013] [Accepted: 04/28/2013] [Indexed: 01/21/2023] Open
Abstract
The label-free detection of one of the cardiac biomarkers, myoglobin, using a photonic-crystal-based biosensor in a total-internal-reflection configuration (PC-TIR) is presented in this paper. The PC-TIR sensor possesses a unique open optical microcavity that allows for several key advantages in biomolecular assays. In contrast to a conventional closed microcavity, the open configuration allows easy functionalization of the sensing surface for rapid biomolecular binding assays. Moreover, the properties of PC structures make it easy to be designed and engineered for operating at any optical wavelength. Through fine design of the photonic crystal structure, biochemical modification of the sensor surface, and integration with a microfluidic system, we have demonstrated that the detection sensitivity of the sensor for myoglobin has reached the clinically significant concentration range, enabling potential usage of this biosensor for diagnosis of acute myocardial infarction. The real-time response of the sensor to the myoglobin binding may potentially provide point-of-care monitoring of patients and treatment effects.
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30
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Anderson CA, Jones AR, Briggs EM, Novitsky EJ, Kuykendall DW, Sottos NR, Zimmerman SC. High-Affinity DNA Base Analogs as Supramolecular, Nanoscale Promoters of Macroscopic Adhesion. J Am Chem Soc 2013; 135:7288-95. [DOI: 10.1021/ja4005283] [Citation(s) in RCA: 71] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Cyrus A. Anderson
- Department
of Chemistry, ‡Department of Mechanical Science and Engineering, §Beckman Institute for Advanced Science
and Technology, and ∥Department of Materials Science and Engineering, University of Illinois at Urbana−Champaign,
Urbana, Illinois 61801, United States
| | - Amanda R. Jones
- Department
of Chemistry, ‡Department of Mechanical Science and Engineering, §Beckman Institute for Advanced Science
and Technology, and ∥Department of Materials Science and Engineering, University of Illinois at Urbana−Champaign,
Urbana, Illinois 61801, United States
| | - Ellen M. Briggs
- Department
of Chemistry, ‡Department of Mechanical Science and Engineering, §Beckman Institute for Advanced Science
and Technology, and ∥Department of Materials Science and Engineering, University of Illinois at Urbana−Champaign,
Urbana, Illinois 61801, United States
| | - Eric J. Novitsky
- Department
of Chemistry, ‡Department of Mechanical Science and Engineering, §Beckman Institute for Advanced Science
and Technology, and ∥Department of Materials Science and Engineering, University of Illinois at Urbana−Champaign,
Urbana, Illinois 61801, United States
| | - Darrell W. Kuykendall
- Department
of Chemistry, ‡Department of Mechanical Science and Engineering, §Beckman Institute for Advanced Science
and Technology, and ∥Department of Materials Science and Engineering, University of Illinois at Urbana−Champaign,
Urbana, Illinois 61801, United States
| | - Nancy R. Sottos
- Department
of Chemistry, ‡Department of Mechanical Science and Engineering, §Beckman Institute for Advanced Science
and Technology, and ∥Department of Materials Science and Engineering, University of Illinois at Urbana−Champaign,
Urbana, Illinois 61801, United States
| | - Steven C. Zimmerman
- Department
of Chemistry, ‡Department of Mechanical Science and Engineering, §Beckman Institute for Advanced Science
and Technology, and ∥Department of Materials Science and Engineering, University of Illinois at Urbana−Champaign,
Urbana, Illinois 61801, United States
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31
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Wang Y, Lowe RD, Mejia YX, Feindt H, Steltenkamp S, Burg TP. A fluorescence based method for the quantification of surface functional groups in closed micro- and nanofluidic channels. BIOMICROFLUIDICS 2013; 7:26503. [PMID: 24404019 PMCID: PMC3651257 DOI: 10.1063/1.4802270] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2012] [Accepted: 04/04/2013] [Indexed: 05/24/2023]
Abstract
Surface analysis is critical for the validation of microfluidic surface modifications for biology, chemistry, and physics applications. However, until now quantitative analytical methods have mostly been focused on open surfaces. Here, we present a new fluorescence imaging method to directly measure the surface coverage of functional groups inside assembled microchannels over a wide dynamic range. A key advance of our work is the elimination of self-quenching to obtain a linear signal even with a high density of functional groups. This method is applied to image the density and monitor the stability of vapor deposited silane layers in bonded silicon/glass micro- and nanochannels.
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Affiliation(s)
- Yu Wang
- Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany
| | - Rachel D Lowe
- Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany
| | - Yara X Mejia
- Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany
| | - Holger Feindt
- Micro Systems Technology (MST), Center of Advanced European Studies and Research (caesar), Ludwig-Erhard-Allee 2, 53175 Bonn, Germany
| | - Siegfried Steltenkamp
- Micro Systems Technology (MST), Center of Advanced European Studies and Research (caesar), Ludwig-Erhard-Allee 2, 53175 Bonn, Germany
| | - Thomas P Burg
- Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany
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32
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Affiliation(s)
- Bala Krishna Pathem
- California NanoSystems Institute,
- Department of Chemistry and Biochemistry, and
| | - Shelley A. Claridge
- California NanoSystems Institute,
- Department of Chemistry and Biochemistry, and
| | - Yue Bing Zheng
- California NanoSystems Institute,
- Department of Chemistry and Biochemistry, and
| | - Paul S. Weiss
- California NanoSystems Institute,
- Department of Chemistry and Biochemistry, and
- Department of Materials Science and Engineering, University of California, Los Angeles, California 90095;
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33
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Stephenson-Brown A, Wang HC, Iqbal P, Preece JA, Long Y, Fossey JS, James TD, Mendes PM. Glucose selective Surface Plasmon Resonance-based bis-boronic acid sensor. Analyst 2013; 138:7140-5. [DOI: 10.1039/c3an01233f] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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34
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Hennig A, Hatami S, Spieles M, Resch-Genger U. Excitation energy migration and trapping on the surface of fluorescent poly(acrylic acid)-grafted polymer particles. Photochem Photobiol Sci 2013; 12:729-37. [DOI: 10.1039/c2pp25364j] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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35
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Cao J, Wu Z, Yang J, Li S, Tang H, Xie G. Site-selective electroless plating of copper on a poly(ethylene terephthalate) surface modified with a self-assembled monolayer. Colloids Surf A Physicochem Eng Asp 2012. [DOI: 10.1016/j.colsurfa.2012.09.045] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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36
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Zhang N, Pompe T, Amin I, Luxenhofer R, Werner C, Jordan R. Tailored poly(2-oxazoline) polymer brushes to control protein adsorption and cell adhesion. Macromol Biosci 2012; 12:926-36. [PMID: 22610725 DOI: 10.1002/mabi.201200026] [Citation(s) in RCA: 118] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2012] [Revised: 02/29/2012] [Indexed: 11/07/2022]
Abstract
POx bottle-brush brushes (BBBs) are synthesized by SIPGP of 2-isopropenyl-2-oxazoline and consecutive LCROP of 2-oxazolines on 3-aminopropyltrimethoxysilane-modified silicon substrates. The side chain hydrophilicity and polarity are varied. The impact of the chemical composition and architecture of the BBB upon protein (fibronectin) adsorption and endothelial cell adhesion are investigated and prove extremely low protein adsorption and cell adhesion on BBBs with hydrophilic side chains such as poly(2-methyl-2-oxazoline) and poly(2-ethyl-2-oxazoline). The influence of the POx side chain terminal function upon adsorption and adhesion is minor but the side chain length has a significant effect on bioadsorption.
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Affiliation(s)
- Ning Zhang
- Wacker-Lehrstuhl für Makromolekulare Chemie, Chemie-Department, TU München, Garching, Germany
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37
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Hennig A, Borcherding H, Jaeger C, Hatami S, Würth C, Hoffmann A, Hoffmann K, Thiele T, Schedler U, Resch-Genger U. Scope and Limitations of Surface Functional Group Quantification Methods: Exploratory Study with Poly(acrylic acid)-Grafted Micro- and Nanoparticles. J Am Chem Soc 2012; 134:8268-76. [DOI: 10.1021/ja302649g] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Andreas Hennig
- BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Strasse
11, D-12489 Berlin, Germany
| | | | - Christian Jaeger
- BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Strasse
11, D-12489 Berlin, Germany
| | - Soheil Hatami
- BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Strasse
11, D-12489 Berlin, Germany
| | - Christian Würth
- BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Strasse
11, D-12489 Berlin, Germany
| | - Angelika Hoffmann
- BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Strasse
11, D-12489 Berlin, Germany
| | - Katrin Hoffmann
- BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Strasse
11, D-12489 Berlin, Germany
| | - Thomas Thiele
- PolyAn GmbH, Rudolf-Baschant-Strasse 2,
D-13086 Berlin, Germany
| | - Uwe Schedler
- PolyAn GmbH, Rudolf-Baschant-Strasse 2,
D-13086 Berlin, Germany
| | - Ute Resch-Genger
- BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Strasse
11, D-12489 Berlin, Germany
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38
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Bhowmick DK, Linden S, Devaux A, De Cola L, Zacharias H. Functionalization of amorphous SiO₂ and 6H-SiC(0001) surfaces with benzo[ghi]perylene-1,2-dicarboxylic anhydride via an APTES linker. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2012; 8:592-619. [PMID: 22262648 DOI: 10.1002/smll.201101941] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2011] [Indexed: 05/31/2023]
Abstract
The successful covalent functionalization of quartz and n-type 6H-SiC with organosilanes and benzo[ghi]perylene-1,2-dicarboxylic dye is demonstrated. In particular, wet-chemically processed self-assembled layers of aminopropyltriethoxysilane (APTES) and benzo[ghi]perylene-1,2-dicarboxylic anhydride are investigated. The structural and chemical properties of these layers are studied by contact angle measurements, attenuated total reflection infrared (ATR-IR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). The optical properties are measured by confocal microscopy. The wetting angles observed for the organic layers are α = 68° for the APTES-functionalized surface, while angles of α = 85° and 78° are determined for dye-functionalized quartz and 6H-SiC surfaces, respectively. However, not all amino groups of the APTES-functionalized surfaces react to bind dye molecules. Further dye functionalization is not uniform throughout the surface, showing different island sizes of the dye and including different chemical environments. The quartz surface exhibits a higher packing density of dyes than the 6H-SiC surface. The fluorescence lifetimes of the surface-attached dye show double exponential decays of about 1.4 and 4.2 ns, largely independent of the substrates.
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Affiliation(s)
- Deb Kumar Bhowmick
- Physikalisches Institut and Center for Nanotechnology (CeNTech), Wilhelm-Klemm-Str. 10, University of Münster, 48149 Münster, Germany.
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39
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Ding L, Liu Y, Cao Y, Wang L, Xin Y, Fang Y. A single fluorescent self-assembled monolayer film sensor with discriminatory power. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm30697b] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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40
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41
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Juárez-Pérez EJ, Granier M, Viñas C, Mutin PH, Núñez R. Grafting of Metallacarboranes onto Self-Assembled Monolayers Deposited on Silicon Wafers. Chem Asian J 2011; 7:277-81. [DOI: 10.1002/asia.201100750] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2011] [Indexed: 11/08/2022]
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42
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Pack SP, Heo TH, Devarayapalli KC, Makino K. Quantitative analysis of specific target DNA oligomers using a DNA-immobilized packed-column system. Anal Bioanal Chem 2011; 401:667-76. [PMID: 21643855 DOI: 10.1007/s00216-011-5129-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2011] [Revised: 05/18/2011] [Accepted: 05/19/2011] [Indexed: 11/28/2022]
Abstract
Although a DNA-immobilized packed-column (DNA-packed column), which relies on sequence-dependent interactions of target DNA or mRNA (in the mobile phase) with DNA probes (on the silica particle) in a continuous flow process, could be considered as an alternative platform for quantitative analysis of specific DNA to DNA chip methodology, the performance in practice has not been satisfactory. In this study, we set up a more efficient quantitative analysis system based on a DNA-packed column by employing a temperature-gradient strategy and DMSO-containing mobile phase. Using a temperature-gradient strategy based on T(m) values of probe/target DNA hybridizations and DMSO (5%)-containing mobile phase, we succeeded in the quantitative analysis of a specific complementary target distinguishable from non-complementary DNA oligomers or other similar DNA samples. In addition, two different target DNA oligomers even with similar T(m) values were separated and detected quantitatively by using a packed column carrying two different DNA probes.
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Affiliation(s)
- Seung Pil Pack
- Department of Biotechnology and Bioinformatics, Korea University, Jochiwon, Chungnam, South Korea.
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43
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Rother D, Sen T, East D, Bruce IJ. Silicon, silica and its surface patterning/activation with alkoxy- and amino-silanes for nanomedical applications. Nanomedicine (Lond) 2011; 6:281-300. [DOI: 10.2217/nnm.10.159] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Silica and silicates are widely used in nanomedicine with applications as diverse as medical device coatings to replacement materials in tissue engineering. Although much is known about silica and its synthesis, relatively few biomedical scientists fully appreciate the link that exists between its formulation and its resultant structure and function. This article attempts to provide insight into relevant issues in that context, as well as highlighting their importance in the material’s eventual surface patterning/activation with alkoxy- and organo-silanes. The use of aminosilanes in that context is discussed at some length to permit an understanding of the specific variables that are important in the reproducible and robust aminoactivation of surfaces using such molecules. Recent investigative work is cited to underline the fact that although aminosilanization is a historically accepted mechanism for surface activation, there is still much to be explained about how and why the process works in the way it does. In the last section of this article, there is a detailed discussion of two classical approaches for the use of aminosilanized materials in the covalent immobilization of bioligands, amino-aldehyde and amino-carboxyl coupling. In the former case, the use of the homobifunctional coupler glutaraldehyde is explored, and in the latter, carbodiimides. Although these chemistries have long been employed in bioconjugations, it is apparent that there are still variables to be explored in the processes (as witnessed by continuing investigations into the chemistries concerned). Aspects regarding optimization, standardization and reproducibility of the fabrication of amino functionalized surfaces are discussed in detail and illustrated with practical examples to aid the reader in their own studies, in terms of considerations to be taken into account when producing such materials. Finally, the article attempts to remind readers that although the chemistry and materials involved are ‘old hat’, there is still much to be learnt about the methods involved. The article also reminds readers that although many highly specific and costly conjugation chemistries now exist for bioligands, there still remains a place for these relatively simple and cost-effective approaches in bioligand conjugate fabrication.
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Affiliation(s)
- Dag Rother
- Nanobiotechnology Research Group, School of Biosciences, University of Kent, Canterbury, Kent, CT2 7NJ, UK
- Bundesanstalt für Arbeitsschutz und Arbeitsmedizin, Freidrich-Henkel-Weg 1-25 D-44149 Dortmund, Germany
| | - Tapas Sen
- Nanobiotechnology Research Group, School of Biosciences, University of Kent, Canterbury, Kent, CT2 7NJ, UK
- Centre for Materials Science, School of Forensic & Investigative Sciences, University of Central Lancashire, Preston, PR1 2HE, UK
| | - Daniel East
- Nanobiotechnology Research Group, School of Biosciences, University of Kent, Canterbury, Kent, CT2 7NJ, UK
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44
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Hennig A, Hoffmann A, Borcherding H, Thiele T, Schedler U, Resch-Genger U. Quantification of surface functional groups on polymer microspheres by supramolecular host–guest interactions. Chem Commun (Camb) 2011; 47:7842-4. [DOI: 10.1039/c1cc11692d] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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45
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Kim J. Formation, Structure, and Reactivity of Amino-Terminated Organic Films on Silicon Substrates. ACS SYMPOSIUM SERIES 2011. [DOI: 10.1021/bk-2011-1062.ch006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Joonyeong Kim
- Department of Chemistry, Buffalo State, State University of New York, 1300 Elmwood Avenue, Buffalo, New York 14222
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46
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Bergkvist M, Cady NC. Chemical functionalization and bioconjugation strategies for atomic force microscope cantilevers. Methods Mol Biol 2011; 751:381-400. [PMID: 21674344 DOI: 10.1007/978-1-61779-151-2_24] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Over the last decade, scanning probe microscopy (SPM) techniques, such as atomic force microscopy (AFM), have played an important role in a variety of biophysical research efforts. This straightforward technique has the capability to measure forces down to a few hundred piconewtons, which enables the observation of unique events within or between single molecules. However, in order to successfully carry out these types of biophysical measurements, the anchoring of the biomolecules of interest to the scanning probe cantilever tip needs to be of sufficient strength to avoid rupture prior to the analysis of the specific interaction to be probed. Hence, a covalent linkage of the biomolecule to the SPM probe tip is generally preferred. It is also advantageous to have a long-chain functional linker to separate the biomolecule from the SPM probe tip so as to minimize unwanted interactions between the substrate surface and the tip and to "isolate" the biomolecular forces being probed. The most common materials for SPM cantilevers are silica and silicon nitride, and there are several surface chemistry approaches available to achieve a covalent linkage to such types of materials. In this chapter, we present various strategies and detailed protocols for conducting surface modifications suitable for biomolecular attachment to AFM probe surfaces or other hydroxylated surfaces. The strategies described build upon an initial surface activation treatment using the convenient gas-phase deposition of an organosilane and incorporate various passivation schemes and biomolecular immobilization techniques.
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Affiliation(s)
- Magnus Bergkvist
- College of Nanoscale Science and Engineering, University at Albany, Albany, NY, USA.
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47
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Gatto E, Caruso M, Porchetta A, Toniolo C, Formaggio F, Crisma M, Venanzi M. Photocurrent generation through peptide-based self-assembled monolayers on a gold surface: antenna and junction effects. J Pept Sci 2010; 17:124-31. [DOI: 10.1002/psc.1329] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2010] [Revised: 10/15/2010] [Accepted: 10/15/2010] [Indexed: 11/08/2022]
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48
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Zeng X, Xu G, Gao Y, An Y. Surface Wettability of (3-Aminopropyl)triethoxysilane Self-Assembled Monolayers. J Phys Chem B 2010; 115:450-4. [DOI: 10.1021/jp109259b] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xiangxuan Zeng
- Department of Chemical Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China
| | - Guohua Xu
- Department of Chemical Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China
| | - Yuan Gao
- Department of Chemical Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China
| | - Yue An
- Department of Chemical Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China
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49
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Roy S, Dixit CK, Woolley R, MacCraith BD, O'Kennedy R, McDonagh C. Novel multiparametric approach to elucidate the surface amine-silanization reaction profile on fluorescent silica nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:18125-18134. [PMID: 21069990 DOI: 10.1021/la103212d] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
This Article addresses the important issue of the characterization of surface functional groups for optical bioassay applications. We use a model system consisting of spherical dye-doped silica nanoparticles (NPs) that have been functionalized with amine groups whereby the encapsulated cyanine-based near-infrared dye fluorescence acts as a probe of the NP surface environment. This facilitates the identification of the optimum deposition parameters for the formation of a stable ordered amine monolayer and also elucidates the functionalization profile of the amine-silanization process. Specifically, we use a novel approach where the techniques of fluorescence correlation spectroscopy (FCS) and fluorescence lifetime measurement (FL) are used in conjunction with the more conventional analytical techniques of zeta potential measurement and Fourier transfer infrared spectroscopy (FTIR). The dynamics of the ordering of the amine layer in different stages of the reaction have been characterized by FTIR, FL, and FCS. The results indicate an optimum reaction time for the formation of a stable amine layer, which is optimized for further biomolecular conjugation, whereas extended reaction times lead to a disordered cross-linked layer. The results have been validated using an immunoglobulin (IgG) plate-based direct binding assay where the maximum number of IgG-conjugated aminated NPs were captured by immobilized anti-IgG antibodies for the NP sample corresponding to the optimized amine-silanization condition. Importantly, these results point to the potential of FCS and FL as useful analytical tools in diverse fields such as characterization of surface functionalization.
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Affiliation(s)
- Shibsekhar Roy
- National Biophotonics and Imaging Platform, School of Physical Sciences, Dublin City University, Glasnevin, Dublin 9, Ireland
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50
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Wu X, Xu B, Tong H, Wang L. Phosphonate-Functionalized Polyfluorene Film Sensors for Sensitive Detection of Iron(III) in both Organic and Aqueous Media. Macromolecules 2010. [DOI: 10.1021/ma1019413] [Citation(s) in RCA: 88] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Xiaofu Wu
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China
- Graduate School, Chinese Academy of Sciences, Beijing 100039, P. R. China
| | - Bowei Xu
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China
- Graduate School, Chinese Academy of Sciences, Beijing 100039, P. R. China
| | - Hui Tong
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China
| | - Lixiang Wang
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China
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