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Wang J, Li S, Yang L, Kwan CS, Xie C, Cheung KY, Sun RWY, Chan ASC, Huang Z, Cai Z, Zeng T, Leung KCF. Janus and Amphiphilic MoS 2 2D Sheets for Surface-Directed Orientational Assemblies toward Ex Vivo Dual Substrate Release. SMALL METHODS 2024:e2400533. [PMID: 38874104 DOI: 10.1002/smtd.202400533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2024] [Revised: 05/17/2024] [Indexed: 06/15/2024]
Abstract
The two-dimensional (2-D) Janus and amphiphilic molybdenum disulfide (MoS2) nanosheet with opposite optical activities on each side (amphichiral) is synthesized by modifying sandwich-like bulk MoS2 with tannic acid and cholesterol through biphasic emulsion method. This new type of amphichiral Janus MoS2 nanosheet consists of a hydrophilic and positive optical activity tannic acid side as well as a hydrophobic and negative optical activity cholesterol side thereby characterized by circular dichroism. Surface-directed orientational differentiation assemblies are performed for the as-synthesized 2D material and are characterized by contact angle, infrared spectroscopy, X-ray photoelectron, and circular dichroism spectroscopies. The amphiphilic nature of the materials is demonstrated by the pre-organization of the nanosheets on either hydrophobic or hydrophilic surfaces, providing unprecedented properties of circular dichroism signal enhancement and wettability. Selective detachment of the surface organic groups (cholesterol and tannic acid fragments) is realized by matrix-assisted laser desorption/ionisation - time-of-flight (MALDI-TOF) mass spectrometry, and the dual substrate release in tissue is detected by ex vivo mass spectrometry imaging.
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Affiliation(s)
- Jianing Wang
- Department of Chemistry and State Key Laboratory of Environmental and Biological Analysis, Hong Kong Baptist University, Kowloon Tong, Kowloon, Hong Kong SAR, P. R. China
| | - Shuqi Li
- College of Environment, Zhejiang University of Technology, 18 Chaowang Road, Hangzhou, Zhejiang, 310014, P. R. China
| | - Lin Yang
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, P. R. China
| | - Chak-Shing Kwan
- Department of Chemistry and State Key Laboratory of Environmental and Biological Analysis, Hong Kong Baptist University, Kowloon Tong, Kowloon, Hong Kong SAR, P. R. China
- Department of Chemistry, Great Bay University and Great Bay Institute for Advanced Study, Dongguan, 523000, P. R. China
| | - Chengyi Xie
- Department of Chemistry and State Key Laboratory of Environmental and Biological Analysis, Hong Kong Baptist University, Kowloon Tong, Kowloon, Hong Kong SAR, P. R. China
| | - Kwan Yin Cheung
- Department of Chemistry and State Key Laboratory of Environmental and Biological Analysis, Hong Kong Baptist University, Kowloon Tong, Kowloon, Hong Kong SAR, P. R. China
| | - Raymond Wai-Yin Sun
- Guangzhou Lee & Man Technology Company Limited, 8 Huanshi Avenue, Nansha, Guangzhou, 511458, P. R. China
| | - Albert S C Chan
- Guangzhou Lee & Man Technology Company Limited, 8 Huanshi Avenue, Nansha, Guangzhou, 511458, P. R. China
| | - Zhifeng Huang
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, P. R. China
| | - Zongwei Cai
- Department of Chemistry and State Key Laboratory of Environmental and Biological Analysis, Hong Kong Baptist University, Kowloon Tong, Kowloon, Hong Kong SAR, P. R. China
| | - Tao Zeng
- Department of Chemistry and State Key Laboratory of Environmental and Biological Analysis, Hong Kong Baptist University, Kowloon Tong, Kowloon, Hong Kong SAR, P. R. China
- College of Environment, Zhejiang University of Technology, 18 Chaowang Road, Hangzhou, Zhejiang, 310014, P. R. China
| | - Ken Cham-Fai Leung
- Department of Chemistry and State Key Laboratory of Environmental and Biological Analysis, Hong Kong Baptist University, Kowloon Tong, Kowloon, Hong Kong SAR, P. R. China
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Jiao W, Zhang T, Peng M, Yi J, He Y, Fan H. Design of Magnetic Nanoplatforms for Cancer Theranostics. BIOSENSORS 2022; 12:38. [PMID: 35049666 PMCID: PMC8774163 DOI: 10.3390/bios12010038] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 01/07/2022] [Accepted: 01/09/2022] [Indexed: 05/04/2023]
Abstract
Cancer is the top cause of death globally. Developing smart nanomedicines that are capable of diagnosis and therapy (theranostics) in one-nanoparticle systems are highly desirable for improving cancer treatment outcomes. The magnetic nanoplatforms are the ideal system for cancer theranostics, because of their diverse physiochemical properties and biological effects. In particular, a biocompatible iron oxide nanoparticle based magnetic nanoplatform can exhibit multiple magnetic-responsive behaviors under an external magnetic field and realize the integration of diagnosis (magnetic resonance imaging, ultrasonic imaging, photoacoustic imaging, etc.) and therapy (magnetic hyperthermia, photothermal therapy, controlled drug delivery and release, etc.) in vivo. Furthermore, due to considerable variation among tumors and individual patients, it is a requirement to design iron oxide nanoplatforms by the coordination of diverse functionalities for efficient and individualized theranostics. In this article, we will present an up-to-date overview on iron oxide nanoplatforms, including both iron oxide nanomaterials and those that can respond to an externally applied magnetic field, with an emphasis on their applications in cancer theranostics.
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Affiliation(s)
- Wangbo Jiao
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi’an 710069, China; (W.J.); (T.Z.); (M.P.)
| | - Tingbin Zhang
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi’an 710069, China; (W.J.); (T.Z.); (M.P.)
| | - Mingli Peng
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi’an 710069, China; (W.J.); (T.Z.); (M.P.)
| | - Jiabao Yi
- Global Innovative Centre for Advanced Nanomaterials, School of Engineering, The University of Newcastle, Newcastle, NSW 2308, Australia;
| | - Yuan He
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi’an 710069, China; (W.J.); (T.Z.); (M.P.)
| | - Haiming Fan
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi’an 710069, China; (W.J.); (T.Z.); (M.P.)
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Gibson JS, Mendes PM. Elucidating the Influence of Electrical Potentials on the Formation of Charged Oligopeptide Self-Assembled Monolayers on Gold. Chemphyschem 2021; 22:684-692. [PMID: 33534936 PMCID: PMC8048453 DOI: 10.1002/cphc.202000988] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Revised: 02/02/2021] [Indexed: 11/09/2022]
Abstract
Self-assembled monolayers (SAMs) based on oligopeptides have garnered immense interest for a wide variety of innovative biomedical and electronic applications. However, to exploit their full potential, it is necessary to understand and control the surface chemistry of oligopeptides. Herein, we report on how different electrical potentials affect the adsorption kinetics, stability and surface coverage of charged oligopeptide SAMs on gold surfaces. Kinetic analysis using electrochemical surface plasmon resonance (e-SPR) reveals a slower oligopeptide adsorption rate at more positive or negative electrical potentials. Additional analysis of the potential-assisted formed SAMs by X-ray photoelectron spectroscopy demonstrates that an applied electrical potential has minimal effect on the packing density. These findings not only reveal that charged oligopeptides exhibit a distinct potential-assisted assembly behaviour but that an electrical potential offers another degree of freedom in controlling their adsorption rate.
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Affiliation(s)
- Joshua S Gibson
- School of Chemical Engineering, University of Birmingham Edgbaston, Birmingham, B15 2TT, UK
| | - Paula M Mendes
- School of Chemical Engineering, University of Birmingham Edgbaston, Birmingham, B15 2TT, UK
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Saddik AA, Mohammed M, Lin HC. The crown ether size and stereochemistry affect the self-assembly, hydrogelation, and cellular interactions of crown ether/peptide conjugates. J Mater Chem B 2020; 8:9961-9970. [DOI: 10.1039/d0tb01913e] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Crown ether ring size affects nanofiber morphology of hydrogels upon conjugation with D- and L-phenylalanine dipeptides. Random nanofibers showed enhanced cell adhesion and proliferation whereas twisted nanofibers displayed weak cell attachments.
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Affiliation(s)
| | - Mohiuddin Mohammed
- Department of Materials Science and Engineering
- National Chiao Tung University
- Republic of China
| | - Hsin-Chieh Lin
- Department of Materials Science and Engineering
- National Chiao Tung University
- Republic of China
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5
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Li B, Yong G. The positional isomeric effects induced various phosphorescence: Switchable properties through acid-base vapor stimulation. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.01.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Wang DM, Aso Y, Ohara H, Tanaka T. Synthesis and Characterization of Alkali Metal Ion-Binding Copolymers Bearing Dibenzo-24-crown-8 Ether Moieties. Polymers (Basel) 2018; 10:polym10101095. [PMID: 30961020 PMCID: PMC6403618 DOI: 10.3390/polym10101095] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Revised: 09/28/2018] [Accepted: 09/28/2018] [Indexed: 11/20/2022] Open
Abstract
Dibenzo-24-crown-8 (DB24C8)-bearing copolymers were synthesized by radical copolymerization using a DB24C8-carrying acrylamide derivative and N-isopropylacrylamide monomers. The cloud point of the resulting copolymers changed in aqueous solution in the presence of cesium ions. In addition, the 1H NMR signals of DB24C8-bearing copolymers shifted in the presence of alkali metal. This shift was more pronounced following the addition of Cs+ compared to Rb+, K+, Na+, and Li+ ions due to recognition of the Cs+ ion by DB24C8.
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Affiliation(s)
- Da-Ming Wang
- Department of Biobased Materials Science, Graduate School of Science and Technology, Kyoto Institute of Technology, Kyoto 606-8585, Japan.
| | - Yuji Aso
- Department of Biobased Materials Science, Graduate School of Science and Technology, Kyoto Institute of Technology, Kyoto 606-8585, Japan.
| | - Hitomi Ohara
- Department of Biobased Materials Science, Graduate School of Science and Technology, Kyoto Institute of Technology, Kyoto 606-8585, Japan.
| | - Tomonari Tanaka
- Department of Biobased Materials Science, Graduate School of Science and Technology, Kyoto Institute of Technology, Kyoto 606-8585, Japan.
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7
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Zhang Y, Zeng H, Mao S, Kondo S, Nakajima H, Kato S, Ren CL, Uchiyama K. Reversibly Switching Molecular Spectra. ACS APPLIED MATERIALS & INTERFACES 2018; 10:23247-23253. [PMID: 29923702 DOI: 10.1021/acsami.8b04530] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Manipulation of light transmission/absorbance and reflection/emission has a great significance in smart windows and displaying media like liquid crystal. Here, we report the usage of an external electric field to reversibly switch the molecular spectra of a model molecule on the basis of its interaction with an electroresponsible polymer brush. Both the UV-vis absorbance spectrum and the fluorescence emission spectrum of the model molecule were confirmed to be electroswitchable. The electroswitchable spectra were experimentally demonstrated to be induced by the electroswitchable statuses of medium anionic poly-allyloxy hydroxypropyl sulfonate (poly-AHPS) brush. Insightfully, the molecular aggregated status of model proflavine molecules could be electrically controlled via the electroresponsible poly-AHPS brushes and then the molecular spectra of the model proflavine molecule also could be electrically and controllably shifted. The success in the manipulation of molecular spectra opens up a wide range of applications not only for displaying but also for nonlinear optics, in vivo imaging, sensors, and environmental inspection.
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Affiliation(s)
- Yong Zhang
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences , Tokyo Metropolitan University , 1-1 Minamiosawa , Hachioji , Tokyo 192-0397 , Japan
| | - Hulie Zeng
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences , Tokyo Metropolitan University , 1-1 Minamiosawa , Hachioji , Tokyo 192-0397 , Japan
| | - Sifeng Mao
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences , Tokyo Metropolitan University , 1-1 Minamiosawa , Hachioji , Tokyo 192-0397 , Japan
| | - Shun Kondo
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences , Tokyo Metropolitan University , 1-1 Minamiosawa , Hachioji , Tokyo 192-0397 , Japan
| | - Hizuru Nakajima
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences , Tokyo Metropolitan University , 1-1 Minamiosawa , Hachioji , Tokyo 192-0397 , Japan
| | - Shungo Kato
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences , Tokyo Metropolitan University , 1-1 Minamiosawa , Hachioji , Tokyo 192-0397 , Japan
| | - Carolyn L Ren
- Department of Mechanical and Mechatronics Engineering , University of Waterloo , 200 University Avenue West , Waterloo , Ontario N2L 3G1 , Canada
| | - Katsumi Uchiyama
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences , Tokyo Metropolitan University , 1-1 Minamiosawa , Hachioji , Tokyo 192-0397 , Japan
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8
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Kawauchi T, Kojima T, Sakaguchi H, Iyoda T. Electrostatic Repulsion-Induced Desorption of Dendritic Viologen-Arranged Molecules Anchored on a Gold Surface through a Gold-Thiolate Bond Leading to a Tunable Molecular Template. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:6420-6427. [PMID: 29733659 DOI: 10.1021/acs.langmuir.8b00858] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We investigated the adsorption and desorption behavior of self-assembled monolayers (SAMs) on gold derived from dendritic viologen-arranged molecules with an ω-mercaptodecyl group (A n, n (dendritic generation) = 0-3) at the apex of the dendritic structure in polar solvents. The adsorption of the dendritic molecules occurred quickly and saturated within a few minutes in an acetonitrile/ethanol (1/1, v/v) mixture at a concentration of 2 mM. Atomic force microscopy images of the SAMs showed flat surfaces regardless of the dendritic generation because the peripheral viologen units were closely packed at the surface of the molecular layer. Individual A3 molecules immobilized on the substrate were observed by scanning tunneling microscopy measurements of a mixed SAM with decanethiol. The desorption behaviors of dendritic molecules from the A n-SAMs in several solvents such as water were also investigated. The spontaneous desorption of the A n-SAM occurred more rapidly than that of a conventional n-alkanethiol SAM. However, the desorption was inhibited by adding electrolytes such as NaNO3 due to the shielding effect on the electrostatic repulsion between the dendritic molecules. These results indicate that the surface density of the dendritic molecules can be controlled through the desorption.
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Affiliation(s)
- Takehiro Kawauchi
- Department of Materials Chemistry, Faculty of Science and Technology , Ryukoku University , 1-5 Yokotani , Oe-cho, Seta, Otsu , Shiga 520-2194 , Japan
| | - Takahiro Kojima
- Institute of Advanced Energy , Kyoto University , Gokasyo, Uji , Kyoto 611-0011 , Japan
| | - Hiroshi Sakaguchi
- Institute of Advanced Energy , Kyoto University , Gokasyo, Uji , Kyoto 611-0011 , Japan
| | - Tomokazu Iyoda
- Harris Science Research Institute , Doshisha University , 1-3 Tatara Miyakodani , Kyotanabe , Kyoto 610-0394 , Japan
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da Silva ETSG, Souto DEP, Barragan JTC, de F. Giarola J, de Moraes ACM, Kubota LT. Electrochemical Biosensors in Point-of-Care Devices: Recent Advances and Future Trends. ChemElectroChem 2017. [DOI: 10.1002/celc.201600758] [Citation(s) in RCA: 170] [Impact Index Per Article: 24.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Everson T. S. G. da Silva
- Department of Analytical Chemistry; Institute of Chemistry -; State University of Campinas - Unicamp; P.O. Box 6154 13084-974 Campinas-SP Brazil
| | - Dênio E. P. Souto
- Department of Analytical Chemistry; Institute of Chemistry -; State University of Campinas - Unicamp; P.O. Box 6154 13084-974 Campinas-SP Brazil
| | - José T. C. Barragan
- Department of Analytical Chemistry; Institute of Chemistry -; State University of Campinas - Unicamp; P.O. Box 6154 13084-974 Campinas-SP Brazil
| | - Juliana de F. Giarola
- Department of Analytical Chemistry; Institute of Chemistry -; State University of Campinas - Unicamp; P.O. Box 6154 13084-974 Campinas-SP Brazil
| | - Ana C. M. de Moraes
- Department of Analytical Chemistry; Institute of Chemistry -; State University of Campinas - Unicamp; P.O. Box 6154 13084-974 Campinas-SP Brazil
| | - Lauro T. Kubota
- Department of Analytical Chemistry; Institute of Chemistry -; State University of Campinas - Unicamp; P.O. Box 6154 13084-974 Campinas-SP Brazil
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Cantini E, Wang X, Koelsch P, Preece JA, Ma J, Mendes PM. Electrically Responsive Surfaces: Experimental and Theoretical Investigations. Acc Chem Res 2016; 49:1223-31. [PMID: 27268783 PMCID: PMC4917918 DOI: 10.1021/acs.accounts.6b00132] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Stimuli-responsive surfaces have sparked considerable interest in recent years, especially in view of their biomimetic nature and widespread biomedical applications. Significant efforts are continuously being directed at developing functional surfaces exhibiting specific property changes triggered by variations in electrical potential, temperature, pH and concentration, irradiation with light, or exposure to a magnetic field. In this respect, electrical stimulus offers several attractive features, including a high level of spatial and temporal controllability, rapid and reverse inducement, and noninvasiveness. In this Account, we discuss how surfaces can be designed and methodologies developed to produce electrically switchable systems, based on research by our groups. We aim to provide fundamental mechanistic and structural features of these dynamic systems, while highlighting their capabilities and potential applications. We begin by briefly describing the current state-of-the-art in integrating electroactive species on surfaces to control the immobilization of diverse biological entities. This premise leads us to portray our electrically switchable surfaces, capable of controlling nonspecific and specific biological interactions by exploiting molecular motions of surface-bound electroswitchable molecules. We demonstrate that our self-assembled monolayer-based electrically switchable surfaces can modulate the interactions of surfaces with proteins, mammalian and bacterial cells. We emphasize how these systems are ubiquitous in both switching biomolecular interactions in highly complex biological conditions while still offering antifouling properties. We also introduce how novel characterization techniques, such as surface sensitive vibrational sum-frequency generation (SFG) spectroscopy, can be used for probing the electrically switchable molecular surfaces in situ. SFG spectroscopy is a technique that not only allowed determining the structural orientation of the surface-tethered molecules under electroinduced switching, but also provided an in-depth characterization of the system reversibility. Furthermore, the unique support from molecular dynamics (MD) simulations is highlighted. MD simulations with polarizable force fields (FFs), which could give proper description of the charge polarization caused by electrical stimulus, have helped not only back many of the experimental observations, but also to rationalize the mechanism of switching behavior. More importantly, this polarizable FF-based approach can efficiently be extended to light or pH stimulated surfaces when integrated with reactive FF methods. The interplay between experimental and theoretical studies has led to a higher level of understanding of the switchable surfaces, and to a more precise interpretation and rationalization of the observed data. The perspectives on the challenges and opportunities for future progress on stimuli-responsive surfaces are also presented.
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Affiliation(s)
| | - Xingyong Wang
- School
of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China
| | - Patrick Koelsch
- Department
of Bioengineering, University of Washington, Seattle, Washington 98195−1653, United States
| | | | - Jing Ma
- School
of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China
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Wen J, Li W, Chen S, Ma J. Simulations of molecular self-assembled monolayers on surfaces: packing structures, formation processes and functions tuned by intermolecular and interfacial interactions. Phys Chem Chem Phys 2016; 18:22757-71. [DOI: 10.1039/c6cp01049k] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Simulations using QM and MM methods guide the rational design of functionalized SAMs on surfaces.
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Affiliation(s)
- Jin Wen
- Institute of Theoretical and Computational Chemistry
- Key Laboratory of Mesoscopic Chemistry of MOE
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
| | - Wei Li
- Institute of Theoretical and Computational Chemistry
- Key Laboratory of Mesoscopic Chemistry of MOE
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
| | - Shuang Chen
- Kuang Yaming Honors School
- Nanjing University
- Nanjing
- P. R. China
| | - Jing Ma
- Institute of Theoretical and Computational Chemistry
- Key Laboratory of Mesoscopic Chemistry of MOE
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
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Roy D, Park JW. Spatially nanoscale-controlled functional surfaces toward efficient bioactive platforms. J Mater Chem B 2015; 3:5135-5149. [PMID: 32262587 DOI: 10.1039/c5tb00529a] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Interest in well-defined surface architectures has shown a steady increase, particularly among those involved in biological applications where the reactivity of functional groups on the surface is desired to be close to that of the solution phase. Recent research has demonstrated that utilizing the self-assembly process is an attractive and viable choice for the fabrication of two-dimensional nanoscale-controlled architectures. This review highlights representative examples for controlling the spatial placement of reactive functional groups in the optimization of bioactive surfaces. While the selection is not comprehensive, it becomes evident that surface architecture is one of the key components in allowing efficient biomolecular interactions with surfaces and that the optimized lateral spacing between the immobilized molecules is crucial and even critical in some cases.
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Affiliation(s)
- Dhruvajyoti Roy
- Nanogea Inc., 6162 Bristol Parkway, Culver City, CA 90230, USA
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Chen C, Xu P, Li X. Regioselective patterning of multiple SAMs and applications in surface-guided smart microfluidics. ACS APPLIED MATERIALS & INTERFACES 2014; 6:21961-21969. [PMID: 25438296 DOI: 10.1021/am508120s] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A top-down nanofabrication technology is developed to integrate multiple SAMs (self-assembled monolayers) into regioselective patterns. With ultraviolet light exposure through regioselectively hollowed hard mask, an existing SAM at designated microregions can be removed and a dissimilar kind of SAM can be regrown there. By repeating the photolithography-like process cycle, diverse kinds of SAM building blocks can be laid out as a desired pattern in one microfluidic channel. In order to ensure high quality of the surface modifications, the SAMs are vapor-phase deposited before the channel is closed by a bonding process. For the first time the technique makes it possible to integrate three or more kinds of SAMs in one microchannel. The technique is very useful for multiplex surface functionalization of microfluidic chips where different segments of a microfluidic channel need to be individually modified with different SAMs or into arrayed pattern for surface-guided fluidic properties like hydrophobicity/philicity and/or oleophobicity/philicity, etc. The technique has been well validated by experimental demonstration of various surface-directed flow-guiding functions. By modifying a microchannel surface into an arrayed pattern of multi-SAM "two-tone" stripe array, surface-guiding-induced 3D swirling flow is generated in a microfluidic channel that experimentally exhibits quick oil/water mixing and high-efficiency oil-to-water chemical extraction.
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Affiliation(s)
- Chuanzhao Chen
- State Key Lab of Transducer Technology, and, Science Technology on Micro-system Lab, Shanghai Institute of Micro-system and Information Technology, Chinese Academy of Sciences , 865 Changning Road, Shanghai 200050, China
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