1
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Imparato C, D’Errico G, Macyk W, Kobielusz M, Vitiello G, Aronne A. Interfacial Charge Transfer Complexes in TiO 2-Enediol Hybrids Synthesized by Sol-Gel. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:1821-1832. [PMID: 35090125 PMCID: PMC8830207 DOI: 10.1021/acs.langmuir.1c02939] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Revised: 01/14/2022] [Indexed: 06/14/2023]
Abstract
Metal oxide-organic hybrid semiconductors exhibit specific properties depending not only on their composition but also on the synthesis procedure, and particularly on the functionalization method, determining the interaction between the two components. Surface adsorption is the most common way to prepare organic-modified metal oxides. Here a simple sol-gel route is described as an alternative, finely controlled strategy to synthesize titanium oxide-based materials containing organic molecules coordinated to the metal. The effect of the molecular structure of the ligands on the surface properties of the hybrids is studied using three enediols able to form charge transfer complexes: catechol, dopamine, and ascorbic acid. For each system, the process conditions driving the transition from the sol to chemical, physical, or particulate gels are explored. The structural, optical, and photoelectrochemical characterization of the amorphous hybrid materials shows analogies and differences related to the organic component. In particular, electron paramagnetic resonance (EPR) spectroscopy at room temperature reveals the presence of organic radical species with different evolution and stability, and photocurrent measurements prove the effective photosensitization of TiO2 in the visible range induced by interfacial ligand-to-metal charge transfer.
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Affiliation(s)
- Claudio Imparato
- Department
of Chemical, Materials and Production Engineering, University of Naples Federico II, P.le V. Tecchio 80, 80125 Napoli, Italy
| | - Gerardino D’Errico
- Department
of Chemical Sciences, University of Naples
Federico II, Via Cinthia, 80126 Napoli, Italy
| | - Wojciech Macyk
- Faculty
of Chemistry, Jagiellonian University, ul. Gronostajowa 2, Kraków 30-387, Poland
| | - Marcin Kobielusz
- Faculty
of Chemistry, Jagiellonian University, ul. Gronostajowa 2, Kraków 30-387, Poland
| | - Giuseppe Vitiello
- Department
of Chemical, Materials and Production Engineering, University of Naples Federico II, P.le V. Tecchio 80, 80125 Napoli, Italy
| | - Antonio Aronne
- Department
of Chemical, Materials and Production Engineering, University of Naples Federico II, P.le V. Tecchio 80, 80125 Napoli, Italy
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2
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Li X, Park I, Tabelin CB, Naruwa K, Goda T, Harada C, Jeon S, Ito M, Hiroyoshi N. Enhanced pyrite passivation by carrier-microencapsulation using Fe-catechol and Ti-catechol complexes. JOURNAL OF HAZARDOUS MATERIALS 2021; 416:126089. [PMID: 34492902 DOI: 10.1016/j.jhazmat.2021.126089] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Revised: 05/08/2021] [Accepted: 05/08/2021] [Indexed: 06/13/2023]
Abstract
Acid mine drainage (AMD) formation is mainly caused by the oxidation of pyrite. Carrier-microencapsulation (CME) using metal-catecholate complexes has been proposed to passivate sulfide minerals by forming surface-protective coatings on their surfaces. Among the various metal-catecholate complexes, Ti-catecholate formed stable coatings having superior acid-resistance, but a thick enough passivating film required considerable time (ca. 14 days) to grow. Meanwhile, Fe-catecholates can form Fe-oxyhydroxide coatings within 2 days, however, they are less stable than Ti-based coating. To address these drawbacks of using a single metal-complex, this study investigated the concurrent use of Fe-catechol and Ti-catechol complexes for accelerating the formation of stable passivating coating on pyrite. Compared with a single metal-complex system, the coating formation was significantly accelerated in mixed system. Linear sweep voltammetry showed the simultaneous decomposition of [Fe(cat)]+ and [Ti(cat)3]2- as the main reason for improved coating formation. Electrochemical properties of coatings formed by single and mixed complex systems, confirmed by electrochemical impedance spectroscopy and cyclic voltammetry, indicated the coating formed in the mixed system had higher resistance and more electrochemically inert than the other cases. The simultaneous use of Fe-catechol and Ti-catechol complexes enhanced pyrite passivation by accelerating metal-complex decomposition and forming more stable coating composed of Fe2TiO5.
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Affiliation(s)
- Xinlong Li
- Division of Sustainable Resources Engineering, Graduate School of Engineering, Hokkaido University, Japan.
| | - Ilhwan Park
- Division of Sustainable Resources Engineering, Faculty of Engineering, Hokkaido University, Japan.
| | - Carlito Baltazar Tabelin
- School of Minerals and Energy Resources Engineering, The University of New South Wales, Sydney, NSW 2052, Australia
| | - Kosuke Naruwa
- Division of Sustainable Resources Engineering, Graduate School of Engineering, Hokkaido University, Japan
| | - Taiki Goda
- Division of Sustainable Resources Engineering, Graduate School of Engineering, Hokkaido University, Japan
| | - Chie Harada
- Division of Sustainable Resources Engineering, Graduate School of Engineering, Hokkaido University, Japan
| | - Sanghee Jeon
- Division of Sustainable Resources Engineering, Faculty of Engineering, Hokkaido University, Japan
| | - Mayumi Ito
- Division of Sustainable Resources Engineering, Faculty of Engineering, Hokkaido University, Japan
| | - Naoki Hiroyoshi
- Division of Sustainable Resources Engineering, Faculty of Engineering, Hokkaido University, Japan
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3
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Zhang L, Feng Y, Li L, Guo X, Du W, Wang S, Xiang J, Cheng P, Tang N. Construction of Magnetic Nanoparticle–Enzyme Complexes with High Loading Efficiency by In Situ Embedding Iron Oxide into Enzymes. Ind Eng Chem Res 2021. [DOI: 10.1021/acs.iecr.1c00191] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Lei Zhang
- Tianjin Key Laboratory of Brine Chemical Industry and Ecological Utilization of Resources, College of Chemical Engineering & Material Science, Tianjin University of Science & Technology, Tianjin 300457, P. R. China
| | - Yuanyuan Feng
- Tianjin Key Laboratory of Brine Chemical Industry and Ecological Utilization of Resources, College of Chemical Engineering & Material Science, Tianjin University of Science & Technology, Tianjin 300457, P. R. China
| | - Linlin Li
- Tianjin Key Laboratory of Brine Chemical Industry and Ecological Utilization of Resources, College of Chemical Engineering & Material Science, Tianjin University of Science & Technology, Tianjin 300457, P. R. China
| | - Xiaofang Guo
- Tianjin Key Laboratory of Brine Chemical Industry and Ecological Utilization of Resources, College of Chemical Engineering & Material Science, Tianjin University of Science & Technology, Tianjin 300457, P. R. China
| | - Wei Du
- Tianjin Key Laboratory of Brine Chemical Industry and Ecological Utilization of Resources, College of Chemical Engineering & Material Science, Tianjin University of Science & Technology, Tianjin 300457, P. R. China
| | - Songbo Wang
- Tianjin Key Laboratory of Brine Chemical Industry and Ecological Utilization of Resources, College of Chemical Engineering & Material Science, Tianjin University of Science & Technology, Tianjin 300457, P. R. China
| | - Jun Xiang
- Tianjin Key Laboratory of Brine Chemical Industry and Ecological Utilization of Resources, College of Chemical Engineering & Material Science, Tianjin University of Science & Technology, Tianjin 300457, P. R. China
| | - Penggao Cheng
- Tianjin Key Laboratory of Brine Chemical Industry and Ecological Utilization of Resources, College of Chemical Engineering & Material Science, Tianjin University of Science & Technology, Tianjin 300457, P. R. China
| | - Na Tang
- Tianjin Key Laboratory of Brine Chemical Industry and Ecological Utilization of Resources, College of Chemical Engineering & Material Science, Tianjin University of Science & Technology, Tianjin 300457, P. R. China
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4
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Liu W, Mirzoeva S, Yuan Y, Deng J, Chen S, Lai B, Vogt S, Shah K, Shroff R, Bleher R, Jin Q, Vo N, Bazak R, Ritner C, Gutionov S, Raha S, Sedlmair J, Hirschmugl C, Jacobsen C, Paunesku T, Kalapurkal J, Woloschak GE. Development of Fe3O4 core–TiO2 shell nanocomposites and nanoconjugates as a foundation for neuroblastoma radiosensitization. Cancer Nanotechnol 2021; 12:12. [PMID: 34777621 PMCID: PMC8550682 DOI: 10.1186/s12645-021-00081-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Accepted: 03/16/2021] [Indexed: 12/17/2022] Open
Abstract
Abstract
Background
Neuroblastoma is the most common extracranial solid malignancy in childhood which, despite the current progress in radiotherapy and chemotherapy protocols, still has a high mortality rate in high risk tumors. Nanomedicine offers exciting and unexploited opportunities to overcome the shortcomings of conventional medicine. The photocatalytic properties of Fe3O4 core-TiO2 shell nanocomposites and their potential for cell specific targeting suggest that nanoconstructs produced using Fe3O4 core-TiO2 shell nanocomposites could be used to enhance radiation effects in neuroblastoma. In this study, we evaluated bare, metaiodobenzylguanidine (MIBG) and 3,4-Dihydroxyphenylacetic acid (DOPAC) coated Fe3O4@TiO2 as potential radiosensitizers for neuroblastoma in vitro.
Results
The uptake of bare and MIBG coated nanocomposites modestly sensitized neuroblastoma cells to ionizing radiation. Conversely, cells exposed to DOPAC coated nanocomposites exhibited a five-fold enhanced sensitivity to radiation, increased numbers of radiation induced DNA double-strand breaks, and apoptotic cell death. The addition of a peptide mimic of the epidermal growth factor (EGF) to nanoconjugates coated with MIBG altered their intracellular distribution. Cryo X-ray fluorescence microscopy tomography of frozen hydrated cells treated with these nanoconjugates revealed cytoplasmic as well as nuclear distribution of the nanoconstructs.
Conclusions
The intracellular distribution pattern of different nanoconjugates used in this study was different for different nanoconjugate surface molecules. Cells exposed to DOPAC covered nanoconjugates showed the smallest nanoconjugate uptake, with the most prominent pattern of large intracellular aggregates. Interestingly, cells treated with this nanoconjugate also showed the most pronounced radiosensitization effect in combination with the external beam x-ray irradiation. Further studies are necessary to evaluate mechanistic basis for this increased radiosensitization effect. Preliminary studies with the nanoparticles carrying an EGF mimicking peptide showed that this approach to targeting could perhaps be combined with a different approach to radiosensitization – use of nanoconjugates in combination with the radioactive iodine. Much additional work will be necessary in order to evaluate possible benefits of targeted nanoconjugates carrying radionuclides.
Graphic abstract
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5
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Vlasova NN, Markitan OV. Adsorption of Catecholamines on a Nanocrystalline Titanium Dioxide Surface. COLLOID JOURNAL 2021. [DOI: 10.1134/s1061933x21020125] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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6
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Le J, Sun T, Peng R, Yuan TF, Feng YQ, Wang ST, Li Y. LC-MS/MS determination of plasma catecholamines after selective extraction by borated zirconia. Mikrochim Acta 2020; 187:165. [DOI: 10.1007/s00604-020-4145-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Accepted: 01/24/2020] [Indexed: 12/11/2022]
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7
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Schechtel E, Dören R, Frerichs H, Panthöfer M, Mondeshki M, Tremel W. Mixed Ligand Shell Formation upon Catechol Ligand Adsorption on Hydrophobic TiO 2 Nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:12518-12531. [PMID: 31487189 DOI: 10.1021/acs.langmuir.9b02496] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Modifying the surfaces of metal oxide nanoparticles (NPs) with monolayers of ligands provides a simple and direct method to generate multifunctional coatings by altering their surface properties. This works best if the composition of the monolayers can be controlled. Mussel-inspired, noninnocent catecholates stand out from other ligands like carboxylates and amines because they are redox-active and allow for highly efficient surface binding and enhanced electron transfer to the surface. However, a comprehensive understanding of their surface chemistry, including surface coverage and displacement of the native ligand, is still lacking. Here, we unravel the displacement of oleate (OA) ligands on hydrophobic, OA-stabilized TiO2 NPs by catecholate ligands using a combination of one- and two-dimensional nuclear magnetic resonance (NMR) spectroscopy techniques. Conclusive pictures of the ligand shells before and after surface modification with catecholate were obtained by 1H and 13C NMR spectroscopy (the 13C chemical shift being more sensitive and with a broader range). The data could be explained using a Langmuir-type approach. Gradual formation of a mixed ligand shell was observed, and the surface processes of catecholate adsorption and OA desorption were quantified. Contrary to the prevailing view, catecholate displaces only a minor fraction (∼20%) of the native OA ligand shell. At the same time, the total ligand density more than doubled from 2.3 nm-2 at native oleate coverage to 4.8 nm-2 at maximum catecholate loading. We conclude that the catecholate ligand adsorbs preferably to unoccupied Ti surface sites rather than replacing native OA ligands. This unexpected behavior, reminiscent of the Vroman effect for protein corona formation, appears to be a fundamental feature in the widely used surface modification of hydrophobic metal oxide NPs with catecholate ligands. Moreover, our findings show that ligand displacement on OA-capped TiO2 NPs is not suited for a full ligand shell refunctionalization because it produces only mixed ligand shells. Therefore, our results contribute to a better understanding and performance of photocatalytic applications based on catecholate ligand-sensitized TiO2 NPs.
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Affiliation(s)
- Eugen Schechtel
- Institut für Anorganische Chemie und Analytische Chemie , Johannes Gutenberg-Universität Mainz , Duesbergweg 10-14 , D-55128 Mainz , Germany
| | - René Dören
- Institut für Anorganische Chemie und Analytische Chemie , Johannes Gutenberg-Universität Mainz , Duesbergweg 10-14 , D-55128 Mainz , Germany
| | - Hajo Frerichs
- Institut für Anorganische Chemie und Analytische Chemie , Johannes Gutenberg-Universität Mainz , Duesbergweg 10-14 , D-55128 Mainz , Germany
| | - Martin Panthöfer
- Institut für Anorganische Chemie und Analytische Chemie , Johannes Gutenberg-Universität Mainz , Duesbergweg 10-14 , D-55128 Mainz , Germany
| | - Mihail Mondeshki
- Institut für Anorganische Chemie und Analytische Chemie , Johannes Gutenberg-Universität Mainz , Duesbergweg 10-14 , D-55128 Mainz , Germany
| | - Wolfgang Tremel
- Institut für Anorganische Chemie und Analytische Chemie , Johannes Gutenberg-Universität Mainz , Duesbergweg 10-14 , D-55128 Mainz , Germany
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8
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Ronchi C, Selli D, Pipornpong W, Di Valentin C. Proton Transfers at a Dopamine-Functionalized TiO 2 Interface. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2019; 123:7682-7695. [PMID: 30976374 PMCID: PMC6453025 DOI: 10.1021/acs.jpcc.8b04921] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Revised: 06/19/2018] [Indexed: 05/27/2023]
Abstract
Despite the many successful syntheses and applications of dopamine-functionalized TiO2 nanohybrids, there has not yet been an atomistic understanding of the interaction of this 1,2-dihydroxybenzene derivative ligand with the titanium dioxide surfaces. In this work, on the basis of a wide set of dispersion-corrected hybrid density functional theory (DFT) calculations and density functional tight binding (DFTB) molecular dynamics simulations, we present a detailed study of the adsorption modes, patterns of growth, and configurations of dopamine on the anatase (101) TiO2 surface, with reference to the archetype of 1,2-dihydroxybenzene ligands, i.e., catechol. At low coverage, the isolated dopamine molecule prefers to bend toward the surface, coordinating the NH2 group to a Ti5c ion. At high coverage, the packed molecules succeed in bending toward the surface only in some monolayer configurations. When they do, we observe a proton transfer from the surface to the ethyl-amino group, forming terminal NH3 + species, which highly interact with the O atoms of a neighboring dopamine molecule. This strong Coulombic interaction largely stabilizes the self-assembled monolayer. On the basis of these results, we predict that improving the probability of dopamine molecules being free to bend toward the surface through thermodynamic versus kinetic growth conditions will lead to a monolayer of fully protonated dopamine molecules.
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Affiliation(s)
- Costanza Ronchi
- Dipartimento
di Scienza dei Materiali, Università
di Milano-Bicocca, via R. Cozzi 55, I-20125 Milano, Italy
| | - Daniele Selli
- Dipartimento
di Scienza dei Materiali, Università
di Milano-Bicocca, via R. Cozzi 55, I-20125 Milano, Italy
| | - Waranyu Pipornpong
- Dipartimento
di Scienza dei Materiali, Università
di Milano-Bicocca, via R. Cozzi 55, I-20125 Milano, Italy
- Department
of Chemistry, Faculty of Science, Chulalongkorn
University, Bangkok 10330, Thailand
| | - Cristiana Di Valentin
- Dipartimento
di Scienza dei Materiali, Università
di Milano-Bicocca, via R. Cozzi 55, I-20125 Milano, Italy
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9
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Nauth AM, Schechtel E, Dören R, Tremel W, Opatz T. TiO2 Nanoparticles Functionalized with Non-innocent Ligands Allow Oxidative Photocyanation of Amines with Visible/Near-Infrared Photons. J Am Chem Soc 2018; 140:14169-14177. [DOI: 10.1021/jacs.8b07539] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Alexander M. Nauth
- Institut für Organische Chemie, Johannes Gutenberg-Universität Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany
| | - Eugen Schechtel
- Institut für Anorganische Chemie und Analytische Chemie, Johannes Gutenberg-Universität Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany
| | - René Dören
- Institut für Anorganische Chemie und Analytische Chemie, Johannes Gutenberg-Universität Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany
| | - Wolfgang Tremel
- Institut für Anorganische Chemie und Analytische Chemie, Johannes Gutenberg-Universität Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany
| | - Till Opatz
- Institut für Organische Chemie, Johannes Gutenberg-Universität Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany
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10
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DiMarco BN, Troian-Gautier L, Sampaio RN, Meyer GJ. Dye-sensitized electron transfer from TiO 2 to oxidized triphenylamines that follows first-order kinetics. Chem Sci 2018; 9:940-949. [PMID: 29629161 PMCID: PMC5874694 DOI: 10.1039/c7sc03839a] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Accepted: 11/16/2017] [Indexed: 11/21/2022] Open
Abstract
Two sensitizers, [Ru(bpy)2(dcb)]2+ (RuC) and [Ru(bpy)2(dpb)]2+ (RuP), where bpy is 2,2'-bipyridine, dcb is 4,4'-dicarboxylic acid-2,2'-bipyridine and dpb is 4,4'-diphosphonic acid-2,2'-bipyridine, were anchored to mesoporous TiO2 thin films and utilized to sensitize the reaction of TiO2 electrons with oxidized triphenylamines, TiO2(e-) + TPA+ → TiO2 + TPA, to visible light in CH3CN electrolytes. A family of four symmetrically substituted triphenylamines (TPAs) with formal Eo(TPA+/0) reduction potentials that spanned a 0.5 eV range was investigated. Surprisingly, the reaction followed first-order kinetics for two TPAs that provided the largest thermodynamic driving force. Such first-order reactivity indicates a strong Coulombic interaction between TPA+ and TiO2 that enables the injected electron to tunnel back in one concerted step. The kinetics for the other TPA derivatives were non-exponential and were modelled with the Kohlrausch-William-Watts (KWW) function. A Perrin-like reaction sphere model is proposed to rationalize the kinetic data. The activation energies were the same for all of the TPAs, within experimental error. The average rate constants were found to increase with the thermodynamic driving force, consistent with electron transfer in the Marcus normal region.
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Affiliation(s)
- Brian N DiMarco
- Department of Chemistry , University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599-3290 , USA .
| | - Ludovic Troian-Gautier
- Department of Chemistry , University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599-3290 , USA .
| | - Renato N Sampaio
- Department of Chemistry , University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599-3290 , USA .
| | - Gerald J Meyer
- Department of Chemistry , University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599-3290 , USA .
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11
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Odling G, Ivaturi A, Chatzisymeon E, Robertson N. Improving Carbon-Coated TiO2
Films with a TiCl4
Treatment for Photocatalytic Water Purification. ChemCatChem 2017. [DOI: 10.1002/cctc.201700867] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Gylen Odling
- School of Chemistry; University of Edinburgh, Joseph Black Building; David Brewster Road Edinburgh EH9 3FJ UK
| | - Aruna Ivaturi
- School of Chemistry; University of Edinburgh, Joseph Black Building; David Brewster Road Edinburgh EH9 3FJ UK
| | - Efthalia Chatzisymeon
- School of Chemistry; University of Edinburgh, Joseph Black Building; David Brewster Road Edinburgh EH9 3FJ UK
| | - Neil Robertson
- School of Chemistry; University of Edinburgh, Joseph Black Building; David Brewster Road Edinburgh EH9 3FJ UK
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12
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Yang S, Su HC, Hou JL, Luo W, Zou DH, Zhu QY, Dai J. The effects of transition-metal doping and chromophore anchoring on the photocurrent response of titanium-oxo-clusters. Dalton Trans 2017; 46:9639-9645. [DOI: 10.1039/c7dt01603d] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Titanium oxo-clusters with both doped metals and anchored chromophores were synthesized and characterized. The photocurrent densities of the clusters were improved by redox active metals and charge transfer chromophores.
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Affiliation(s)
- Shen Yang
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
- People's Republic of China
| | - Hu-Chao Su
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
- People's Republic of China
| | - Jin-Le Hou
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
- People's Republic of China
| | - Wen Luo
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
- People's Republic of China
| | - Dan-Hong Zou
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
- People's Republic of China
| | - Qin-Yu Zhu
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
- People's Republic of China
| | - Jie Dai
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
- People's Republic of China
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13
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Wang Z, Li J, Tang F, Lin J, Jin Z. Polydopamine nanotubes-templated synthesis of TiO2 and its photocatalytic performance under visible light. RSC Adv 2017. [DOI: 10.1039/c7ra03063k] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
As templates for generation of TiO2 photocatalysts, polydopamine nanotubes can provide codopants (carbon and nitrogen) and graphene-like carbon coverings simultaneously.
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Affiliation(s)
- Zehuan Wang
- Department of Chemistry
- Renmin University of China
- Beijing 100872
- People's Republic of China
| | - Jia Li
- Department of Chemistry
- Renmin University of China
- Beijing 100872
- People's Republic of China
| | - Feng Tang
- Department of Chemistry
- Renmin University of China
- Beijing 100872
- People's Republic of China
| | - Jun Lin
- Department of Chemistry
- Renmin University of China
- Beijing 100872
- People's Republic of China
| | - Zhaoxia Jin
- Department of Chemistry
- Renmin University of China
- Beijing 100872
- People's Republic of China
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14
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Das P, Reches M. Revealing the role of catechol moieties in the interactions between peptides and inorganic surfaces. NANOSCALE 2016; 8:15309-15316. [PMID: 27503417 DOI: 10.1039/c6nr04550b] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Catechol (1,2-dihydroxy benzene) moieties are being widely used today in new adhesive technologies. Understanding their mechanism of action is therefore of high importance for developing their applications in materials science. This paper describes a single-molecule study of the interactions between catechol-related amino acid residues and a well-defined titanium dioxide (TiO2) surface. It is the first quantified measurement of the adhesion of these residues with a well-defined TiO2 surface. Single-molecule force spectroscopy measurements with AFM determined the role of different substitutions of the catechol moiety on the aromatic ring in the adhesion to the surface. These results shed light on the nature of interactions between these residues and inorganic metal oxide surfaces. This information is important for the design and fabrication of catechol-based materials such as hydrogels, coatings, and composites. Specifically, the interaction with TiO2 is important for the development of solar cells.
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Affiliation(s)
- Priyadip Das
- Institute of Chemistry and The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel.
| | - Meital Reches
- Institute of Chemistry and The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel.
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15
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Liu T, Li X, Yuan X, Wang Y, Li F. Enhanced visible-light photocatalytic activity of a TiO2 hydrosol assisted by H2O2: Surface complexation and kinetic modeling. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.molcata.2016.01.011] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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16
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Santaclara JG, Nasalevich MA, Castellanos S, Evers WH, Spoor FCM, Rock K, Siebbeles LDA, Kapteijn F, Grozema F, Houtepen A, Gascon J, Hunger J, van der Veen MA. Organic Linker Defines the Excited-State Decay of Photocatalytic MIL-125(Ti)-Type Materials. CHEMSUSCHEM 2016; 9:388-395. [PMID: 26871265 DOI: 10.1002/cssc.201501353] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2015] [Revised: 11/27/2015] [Indexed: 06/05/2023]
Abstract
Recently, MIL-125(Ti) and NH2 -MIL-125(Ti), two titanium-based metal-organic frameworks, have attracted significant research attention in the field of photocatalysis for solar fuel generation. This work reveals that the differences between these structures are not only based on their light absorption range but also on the decay profile and topography of their excited states. In contrast to MIL-125(Ti), NH2 -MIL-125(Ti) shows markedly longer lifetimes of the charge-separated state, which improves photoconversion by the suppression of competing decay mechanisms. We used spectroelectrochemistry and ultrafast spectroscopy to demonstrate that upon photoexcitation in NH2 -MIL-125(Ti) the electron is located in the Ti-oxo clusters and the hole resides on the aminoterephthalate unit, specifically on the amino group. The results highlight the role of the amino group in NH2 -MIL-125(Ti), the electron donation of which extends the lifetime of the photoexcited state substantially.
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Affiliation(s)
- Jara G Santaclara
- Catalysis Engineering, Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, 2628 BL, Delft, The Netherlands
| | - Maxim A Nasalevich
- Catalysis Engineering, Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, 2628 BL, Delft, The Netherlands
| | - Sonia Castellanos
- Catalysis Engineering, Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, 2628 BL, Delft, The Netherlands
| | - Wiel H Evers
- Optoelectronic Materials, Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, 2628 BL, Delft, The Netherlands
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ, Delft, The Netherlands
| | - Frank C M Spoor
- Optoelectronic Materials, Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, 2628 BL, Delft, The Netherlands
| | - Kamila Rock
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Laurens D A Siebbeles
- Optoelectronic Materials, Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, 2628 BL, Delft, The Netherlands
| | - Freek Kapteijn
- Catalysis Engineering, Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, 2628 BL, Delft, The Netherlands
| | - Ferdinand Grozema
- Optoelectronic Materials, Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, 2628 BL, Delft, The Netherlands
| | - Arjan Houtepen
- Optoelectronic Materials, Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, 2628 BL, Delft, The Netherlands
| | - Jorge Gascon
- Catalysis Engineering, Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, 2628 BL, Delft, The Netherlands
| | - Johannes Hunger
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Monique A van der Veen
- Catalysis Engineering, Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, 2628 BL, Delft, The Netherlands.
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17
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Ooyama Y, Kanda M, Uenaka K, Ohshita J. Effect of Substituents in Catechol Dye Sensitizers on Photovoltaic Performance of Type II Dye-Sensitized Solar Cells. Chemphyschem 2015; 16:3049-57. [PMID: 26296714 DOI: 10.1002/cphc.201500419] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2015] [Revised: 07/06/2015] [Indexed: 11/07/2022]
Abstract
In order to provide a direction in molecular design of catechol (Cat) dyes for type II dye-sensitized solar cells (DSSCs), the dye-to-TiO2 charge-transfer (DTCT) characteristics of Cat dyes with various substituents and their photovoltaic performance in DSSCs are investigated. The Cat dyes with electron-donating or moderately electron-withdrawing substituents exhibit a broad absorption band corresponding to DTCT upon binding to TiO2 films, whereas those with strongly electron-withdrawing substituents exhibit weak DTCT. This study indicates that the introduction of a moderately electron-withdrawing substituent on the Cat moiety leads to not only an increase in the DTCT efficiency, but also the retardation of back electron transfer. This results in favorable conditions for the type II electron-injection pathway from the ground state of the Cat dye to the conduction band of the TiO2 electrode by the photoexcitation of DTCT bands.
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Affiliation(s)
- Yousuke Ooyama
- Department of Applied Chemistry, Graduate School of Engineering Hiroshima University, Higashi-Hiroshima 739-8527 (Japan).
| | - Masahiro Kanda
- Department of Applied Chemistry, Graduate School of Engineering Hiroshima University, Higashi-Hiroshima 739-8527 (Japan)
| | - Koji Uenaka
- Department of Applied Chemistry, Graduate School of Engineering Hiroshima University, Higashi-Hiroshima 739-8527 (Japan)
| | - Joji Ohshita
- Department of Applied Chemistry, Graduate School of Engineering Hiroshima University, Higashi-Hiroshima 739-8527 (Japan)
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18
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Burger A, Costa RD, Lobaz V, Peukert W, Guldi DM, Hirsch A. Layer-by-Layer Assemblies of Catechol-Functionalized TiO2Nanoparticles and Porphyrins through Electrostatic Interactions. Chemistry 2015; 21:5041-54. [DOI: 10.1002/chem.201405039] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2014] [Indexed: 12/25/2022]
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19
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Smith SJD, Ladewig BP, Hill AJ, Lau CH, Hill MR. Post-synthetic Ti exchanged UiO-66 metal-organic frameworks that deliver exceptional gas permeability in mixed matrix membranes. Sci Rep 2015; 5:7823. [PMID: 25592747 PMCID: PMC4296298 DOI: 10.1038/srep07823] [Citation(s) in RCA: 108] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2014] [Accepted: 12/11/2014] [Indexed: 12/24/2022] Open
Abstract
Gas separation membranes are one of the lowest energy technologies available for the separation of carbon dioxide from flue gas. Key to handling the immense scale of this separation is maximised membrane permeability at sufficient selectivity for CO2 over N2. For the first time it is revealed that metals can be post-synthetically exchanged in MOFs to drastically enhance gas transport performance in membranes. Ti-exchanged UiO-66 MOFs have been found to triple the gas permeability without a loss in selectivity due to several effects that include increased affinity for CO2 and stronger interactions between the polymer matrix and the Ti-MOFs. As a result, it is also shown that MOFs optimized in previous works for batch-wise adsorption applications can be applied to membranes, which have lower demands on material quantities. These membranes exhibit exceptional CO2 permeability enhancement of as much as 153% when compared to the non-exchanged UiO-66 mixed-matrix controls, which places them well above the Robeson upper bound at just a 5 wt.% loading. The fact that maximum permeability enhancement occurs at such low loadings, significantly less than the optimum for other MMMs, is a major advantage in large-scale application due to the more attainable quantities of MOF needed.
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Affiliation(s)
- Stefan J D Smith
- 1] Monash University, Department of Chemical Engineering, Clayton, VIC 3800, Australia [2] CSIRO, Private Bag 33, Clayton South MDC, VIC 3169, Australia
| | - Bradley P Ladewig
- Monash University, Department of Chemical Engineering, Clayton, VIC 3800, Australia
| | - Anita J Hill
- CSIRO, Private Bag 33, Clayton South MDC, VIC 3169, Australia
| | - Cher Hon Lau
- CSIRO, Private Bag 33, Clayton South MDC, VIC 3169, Australia
| | - Matthew R Hill
- CSIRO, Private Bag 33, Clayton South MDC, VIC 3169, Australia
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20
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Savić TD, Čomor MI, Nedeljković JM, Veljković DŽ, Zarić SD, Rakić VM, Janković IA. The effect of substituents on the surface modification of anatase nanoparticles with catecholate-type ligands: a combined DFT and experimental study. Phys Chem Chem Phys 2014; 16:20796-805. [DOI: 10.1039/c4cp02197e] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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21
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Jackman MJ, Syres KL, Cant DJH, Hardman SJO, Thomas AG. Adsorption of dopamine on rutile TiO2 (110): a photoemission and near-edge X-ray absorption fine structure study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:8761-8769. [PMID: 25003716 DOI: 10.1021/la501357b] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Synchrotron radiation photoelectron spectroscopy and near-edge X-ray absorption fine structure (NEXAFS) techniques have been used to study the adsorption of dopamine on a rutile TiO2 (110) single crystal. Photoemission results suggest that dopamine bonds through the oxygen molecules in a bidentate fashion. From the data, it is ambiguous whether the oxygens bond to the same 5-fold coordinated surface titanium atom or bridges across two, although based on the bonding of pyrocatechol on rutile TiO2 (110), it is likely that the dopamine bridges two titanium atoms. Using the searchlight effect, the carbon K-edge near-edge X-ray absorption fine structure NEXAFS spectra recorded for dopamine on rutile TiO2 (110) show the phenyl ring to be oriented at 78° ± 5° from the surface and twisted 11 ± 10° relative to the (001) direction.
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Affiliation(s)
- Mark J Jackman
- School of Physics and Astronomy and Photon Science Institute, Alan Turing Building, The University of Manchester , Oxford Road, Manchester M13 9PL, UK
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22
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Ryu JY, Song IT, Lau KHA, Messersmith P, Yoon TY, Lee H. New antifouling platform characterized by single-molecule imaging. ACS APPLIED MATERIALS & INTERFACES 2014; 6:3553-3558. [PMID: 24503420 PMCID: PMC3985779 DOI: 10.1021/am4057387] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2013] [Accepted: 02/06/2014] [Indexed: 05/31/2023]
Abstract
Antifouling surfaces have been widely studied for their importance in medical devices and industry. Antifouling surfaces mostly achieved by methoxy-poly(ethylene glycol) (mPEG) have shown biomolecular adsorption less than 1 ng/cm(2) which was measured by surface analytical tools such as surface plasmon resonance (SPR) spectroscopy, quartz crystal microbalance (QCM), or optical waveguide lightmode (OWL) spectroscopy. Herein, we utilize a single-molecule imaging technique (i.e., an ultimate resolution) to study antifouling properties of functionalized surfaces. We found that about 600 immunoglobulin G (IgG) molecules are adsorbed. This result corresponds to ∼5 pg/cm(2) adsorption, which is far below amount for the detection limit of the conventional tools. Furthermore, we developed a new antifouling platform that exhibits improved antifouling performance that shows only 78 IgG molecules adsorbed (∼0.5 pg/cm(2)). The antifouling platform consists of forming 1 nm TiO2 thin layer, on which peptidomimetic antifouling polymer (PMAP) is robustly anchored. The unprecedented antifouling performance can potentially revolutionize a variety of research fields such as single-molecule imaging, medical devices, biosensors, and others.
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Affiliation(s)
- Ji Young Ryu
- Department
of Chemistry, National Creative Research Initiative Center for Single-Molecule
Systems Biology, and Department of Physics, KAIST, 291 University Rd., Daejeon 305-701, Republic
of Korea
| | - In Taek Song
- Department
of Chemistry, National Creative Research Initiative Center for Single-Molecule
Systems Biology, and Department of Physics, KAIST, 291 University Rd., Daejeon 305-701, Republic
of Korea
| | - K. H. Aaron Lau
- Biomedical Engineering Department, Northwestern University, Evanston, Illinois 60208, United States
| | - Phillip
B. Messersmith
- Biomedical Engineering Department, Northwestern University, Evanston, Illinois 60208, United States
| | - Tae-Young Yoon
- Department
of Chemistry, National Creative Research Initiative Center for Single-Molecule
Systems Biology, and Department of Physics, KAIST, 291 University Rd., Daejeon 305-701, Republic
of Korea
| | - Haeshin Lee
- Department
of Chemistry, National Creative Research Initiative Center for Single-Molecule
Systems Biology, and Department of Physics, KAIST, 291 University Rd., Daejeon 305-701, Republic
of Korea
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23
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Yuan Y, Chen S, Paunesku T, Gleber SC, Liu WC, Doty CB, Mak R, Deng J, Jin Q, Lai B, Brister K, Flachenecker C, Jacobsen C, Vogt S, Woloschak GE. Epidermal growth factor receptor targeted nuclear delivery and high-resolution whole cell X-ray imaging of Fe3O4@TiO2 nanoparticles in cancer cells. ACS NANO 2013; 7:10502-17. [PMID: 24219664 PMCID: PMC3919441 DOI: 10.1021/nn4033294] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Sequestration within the cytoplasm often limits the efficacy of therapeutic nanoparticles that have specific subcellular targets. To allow for both cellular and subcellular nanoparticle delivery, we have created epidermal growth factor receptor (EGFR)-targeted Fe3O4@TiO2 nanoparticles that use the native intracellular trafficking of EGFR to improve internalization and nuclear translocation in EGFR-expressing HeLa cells. While bound to EGFR, these nanoparticles do not interfere with the interaction between EGFR and karyopherin-β, a protein that is critical for the translocation of ligand-bound EGFR to the nucleus. Thus, a portion of the EGFR-targeted nanoparticles taken up by the cells also reaches cell nuclei. We were able to track nanoparticle accumulation in cells by flow cytometry and nanoparticle subcellular distribution by confocal fluorescent microscopy indirectly, using fluorescently labeled nanoparticles. More importantly, we imaged and quantified intracellular nanoparticles directly, by their elemental signatures, using X-ray fluorescence microscopy at the Bionanoprobe, the first instrument of its kind in the world. The Bionanoprobe can focus hard X-rays down to a 30 nm spot size to map the positions of chemical elements tomographically within whole frozen-hydrated cells. Finally, we show that photoactivation of targeted nanoparticles in cell nuclei, dependent on successful EGFR nuclear accumulation, induces significantly more double-stranded DNA breaks than photoactivation of nanoparticles that remain exclusively in the cytoplasm.
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Affiliation(s)
- Ye Yuan
- Department of Radiation Oncology, Northwestern University, Chicago, Illinois 60611, USA
| | - Si Chen
- X-ray Sciences Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Tatjana Paunesku
- Department of Radiation Oncology, Northwestern University, Chicago, Illinois 60611, USA
| | | | - William C. Liu
- Department of Radiation Oncology, Northwestern University, Chicago, Illinois 60611, USA
| | - Caroline B. Doty
- Department of Radiation Oncology, Northwestern University, Chicago, Illinois 60611, USA
| | - Rachel Mak
- Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208, USA
| | - Junjing Deng
- Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208, USA
| | - Qiaoling Jin
- X-ray Sciences Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Barry Lai
- X-ray Sciences Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Keith Brister
- Northwestern Synchrotron Research Center, Argonne, Illinois 60439, USA
| | | | - Chris Jacobsen
- X-ray Sciences Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
- Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208, USA
| | - Stefan Vogt
- X-ray Sciences Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Gayle E. Woloschak
- Department of Radiation Oncology, Northwestern University, Chicago, Illinois 60611, USA
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24
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Savić TD, Šaponjić ZV, Čomor MI, Nedeljković JM, Dramićanin MD, Nikolić MG, Veljković DŽ, Zarić SD, Janković IA. Surface modification of anatase nanoparticles with fused ring salicylate-type ligands (3-hydroxy-2-naphthoic acids): a combined DFT and experimental study of optical properties. NANOSCALE 2013; 5:7601-7612. [PMID: 23842592 DOI: 10.1039/c3nr01277h] [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
The surface modification of nanocrystalline TiO2 particles (45 Å) with salicylate-type ligands consisting of an extended aromatic ring system, specifically 3-hydroxy-2-naphthoic acid, 3,5-dihydroxy-2-naphthoic acid and 3,7-dihydroxy-2-naphthoic acid, was found to alter the optical properties of nanoparticles in a similar way to salicylic acid. The formation of the inner-sphere charge-transfer (CT) complexes results in a red shift of the semiconductor absorption compared to unmodified nanocrystallites and a reduction in the band gap upon the increase in the electron delocalization when including an additional ring. The investigated ligands have the optimal geometry for binding to surface Ti atoms, resulting in ring coordination complexes of a salicylate-type (binuclear bidentate binding-bridging) thus restoring the six-coordinated octahedral geometry of surface Ti atoms. From both absorption measurements in methanol/water = 90/10 solutions and steady-state quenching measurements of modifier fluorescence upon binding to TiO2 in aqueous solutions, stability constants in the order of 10(3) M(-1) have been determined at pH 2 and pH 3. Fluorescence lifetime measurements, in the presence and absence of colloidal TiO2 nanoparticles, indicated that the fluorescence quenching process is primarily static quenching, thus proving the formation of a nonfluorescent CT complex. The binding structures were investigated by using FTIR spectroscopy. Quantum chemical calculations on model systems using density functional theory (DFT) were performed to obtain the vibrational frequencies of charge transfer complexes, and the calculated values were then compared with the experimental data.
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Affiliation(s)
- Tatjana D Savić
- University of Belgrade, Vinča Institute of Nuclear Sciences, P.O. Box 522, 11001 Belgrade, Serbia
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25
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Allard P, Darnajoux R, Phalyvong K, Bellenger JP. Effects of tungsten and titanium oxide nanoparticles on the diazotrophic growth and metals acquisition by Azotobacter vinelandii under molybdenum limiting condition. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2013; 47:2061-2068. [PMID: 23339336 DOI: 10.1021/es304544k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The acquisition of essential metals, such as the metal cofactors (molybdenum (Mo) and iron (Fe)) of the nitrogenase, the enzyme responsible for the reduction of dinitrogen (N(2)) to ammonium, is critical to N(2) fixing bacteria in soil. The release of metal nanoparticles (MNPs) to the environment could be detrimental to N(2) fixing bacteria by introducing a new source of toxic metals and by interfering with the acquisition of essential metals such as Mo. Since Mo has been reported to limit nonsymbiotic N(2) fixation in many ecosystems from tropical to cold temperate, this question is particularly acute in the context of Mo limitation. Using a combination of microbiology and analytical chemistry techniques, we have evaluated the effect of titanium (Ti) and tungsten (W) oxide nanoparticles on the diazotrophic growth and metals acquisition in pure culture of the ubiquitous N(2) fixing bacterium Azotobacter vinelandii under Mo replete and Mo limiting conditions. We report that under our conditions (≤10 mg·L(-1)) TiO(2) NPs have no effects on the diazotrophic growth of A. vinelandii while WO(3) NPs are highly detrimental to the growth especially under Mo limiting conditions. Our results show that the toxicity of WO(3) NPs to A. vinelandii is due to an interference with the catechol-metalophores assisted uptake of Mo.
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Affiliation(s)
- Patrick Allard
- Département de Chimie, Université de Sherbrooke, 2500 Boul. de l'Université, Sherbrooke, Québec J1K 2R1, Canada
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26
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Kotsokechagia T, Zaki NM, Syres K, de Leonardis P, Thomas A, Cellesi F, Tirelli N. PEGylation of nanosubstrates (titania) with multifunctional reagents: at the crossroads between nanoparticles and nanocomposites. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:11490-11501. [PMID: 22746328 DOI: 10.1021/la3012958] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Titania (anatase) nanoparticles were successfully PEGylated through the use of catechol (dopamine)-terminated PEG derivatives. The resulting materials were characterized by excellent stability at neutral pH and extremely low toxicity (phagocytic and nonphagocytic cell lines). In particular, we focused on the comparison between mono- and bis-catechol PEGs. Due to the double terminal anchorage on the titania surface, bis-catechol ligands can produce chains differing from classical monoanchored PEG in conformation (horseshoe-shaped vs brush) and thus the possibility of interactions with biomolecules. At the same time, less than quantitative catechol binding may lead to the presence of dangling chains with unbound catechols which can polymerize and eventually produce PEG/titania nanocomposite colloids. Our results on double-functional PEG2000 show the latter to be the case. Pluronic F127 was also used as a bifunctional ligand, leading to nanocomposite aggregates with an even larger organic content.
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Affiliation(s)
- Tania Kotsokechagia
- School of Pharmacy and Pharmaceutical Sciences, University of Manchester, Manchester, United Kingdom
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27
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Kwolek P, Oszajca M, Szaciłowski K. Catecholate and 2,3-acenediolate complexes of d0 ions as prospective materials for molecular electronics and spintronics. Coord Chem Rev 2012. [DOI: 10.1016/j.ccr.2012.03.028] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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28
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Ooyama Y, Harima Y. Photophysical and electrochemical properties, and molecular structures of organic dyes for dye-sensitized solar cells. Chemphyschem 2012; 13:4032-80. [PMID: 22807392 DOI: 10.1002/cphc.201200218] [Citation(s) in RCA: 175] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2012] [Revised: 05/17/2012] [Indexed: 11/06/2022]
Abstract
Dye-sensitized solar cells (DSSCs) based on organic dyes adsorbed on oxide semiconductor electrodes, such as TiO(2), ZnO, or NiO, which have emerged as a new generation of sustainable photovoltaic devices, have attracted much attention from chemists, physicists, and engineers because of enormous scientific interest in not only their construction and operational principles, but also in their high incident-solar-light-to-electricity conversion efficiency and low cost of production. To develop high-performance DSSCs, it is important to create efficient organic dye sensitizers, which should be optimized for the photophysical and electrochemical properties of the dyes themselves, with molecular structures that provide good light-harvesting features, good electron communication between the dye and semiconductor electrode and between the dye and electrolyte, and to control the molecular orientation and arrangement of the dyes on a semiconductor surface. The aim of this Review is not to make a list of a number of organic dye sensitizers developed so far, but to provide a new direction in the epoch-making molecular design of organic dyes for high photovoltaic performance and long-term stability of DSSCs, based on the accumulated knowledge of their photophysical and electrochemical properties, and molecular structures of the organic dye sensitizers developed so far.
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Affiliation(s)
- Yousuke Ooyama
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan.
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29
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Savić TD, Janković IA, Šaponjić ZV, Čomor MI, Veljković DŽ, Zarić SD, Nedeljković JM. Surface modification of anatase nanoparticles with fused ring catecholate type ligands: a combined DFT and experimental study of optical properties. NANOSCALE 2012; 4:1612-1619. [PMID: 22310856 DOI: 10.1039/c2nr11501h] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Surface modification of nanocrystalline TiO(2) particles (45 Å) with catecholate-type ligands consisting of an extended aromatic ring system, i.e., 2,3-dihydroxynaphthalene and anthrarobin, was found to alter the optical properties of the nanoparticles in a similar way to modification with catechol. The formation of inner-sphere charge-transfer (CT) complexes results in a red shift of the semiconductor absorption compared to unmodified nanocrystallites and the reduction of the band gap upon the increase of the electron delocalization on the inclusion of additional rings. The binding structures were investigated by FTIR spectroscopy. The investigated ligands have the optimal geometry for binding to surface Ti atoms, resulting in ring coordination complexes of catecholate type (binuclear bidentate binding-bridging) thus restoring the six-coordinated octahedral geometry of surface Ti atoms. From the Benesi-Hildebrand plot, stability constants in methanol/water = 90/10 solutions at pH 2 of the order 10(3) M(-1) have been determined. Quantum chemical calculations on model systems using density functional theory (DFT) were performed to obtain vibrational frequencies of charge transfer complexes, and the calculated values were compared with the experimental data.
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Affiliation(s)
- Tatjana D Savić
- University of Belgrade, Vinča Institute of Nuclear Sciences, P.O. Box 522, 11001, Belgrade, Serbia
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30
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Dehaen G, Eliseeva SV, Kimpe K, Laurent S, Vander Elst L, Muller RN, Dehaen W, Binnemans K, Parac-Vogt TN. A Self-Assembled Complex with a Titanium(IV) Catecholate Core as a Potential Bimodal Contrast Agent. Chemistry 2011; 18:293-302. [DOI: 10.1002/chem.201101413] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2011] [Revised: 08/23/2011] [Indexed: 11/06/2022]
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31
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Affiliation(s)
- Katherine M. Buettner
- Department of Chemistry, Yale University, New Haven, Connecticut 06520-8107, United States
| | - Ann M. Valentine
- Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122, United States
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32
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Liu J, Li J, Yu B, Ma B, Zhu Y, Song X, Cao X, Yang W, Zhou F. Tribological properties of self-assembled monolayers of catecholic imidazolium and the spin-coated films of ionic liquids. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:11324-11331. [PMID: 21834561 DOI: 10.1021/la201378b] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A novel compound of an imidazolium type of ionic liquid (IL) containing a biomimetic catecholic functional group normally seen in mussel adhesive proteins was synthesized. The IL can be immobilized on a silicon surface and a variety of other engineering material surfaces via the catecholic anchor, allowing the tribological protection of these substrates for engineering applications. The surface wetting and adhesive properties and the tribological property of the synthesized self-assembled monolayers (SAMs) are successfully modulated by altering the counteranions. The chemical composition and wettability of the IL SAMs were characterized by means of X-ray photoelectron spectroscopy (XPS) and contact angle (CA) measurements. The adhesive and friction forces were measured with an atomic force microscope (AFM) on the nanometer scale. IL composite films were prepared by spin coating thin IL films on top of the SAMs. The macrotribological properties of these IL composite films were investigated with a pin-on-disk tribometer. The results indicate that the presence of IL SAMs on a surface can improve the wettability of spin-coated ionic liquids and thus the film quality and the tribological properties. These films registered a reduced friction coefficient and a significantly enhanced durability and load-carrying capacity. The tribological properties of the composite films are better than those of pure IL films because the presence of the monolayers improves the adhesion and compatibility of spin-coated IL films with substrates.
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Affiliation(s)
- Jianxi Liu
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China
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33
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Chatterjee PB, Goncharov-Zapata O, Quinn LL, Hou G, Hamaed H, Schurko RW, Polenova T, Crans DC. Characterization of noninnocent metal complexes using solid-state NMR spectroscopy: o-dioxolene vanadium complexes. Inorg Chem 2011; 50:9794-803. [PMID: 21842875 DOI: 10.1021/ic200046k] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
(51)V solid-state NMR (SSNMR) studies of a series of noninnocent vanadium(V) catechol complexes have been conducted to evaluate the possibility that (51)V NMR observables, quadrupolar and chemical shift anisotropies, and electronic structures of such compounds can be used to characterize these compounds. The vanadium(V) catechol complexes described in these studies have relatively small quadrupolar coupling constants, which cover a surprisingly small range from 3.4 to 4.2 MHz. On the other hand, isotropic (51)V NMR chemical shifts cover a wide range from -200 to 400 ppm in solution and from -219 to 530 ppm in the solid state. A linear correlation of (51)V NMR isotropic solution and solid-state chemical shifts of complexes containing noninnocent ligands is observed. These experimental results provide the information needed for the application of (51)V SSNMR spectroscopy in characterizing the electronic properties of a wide variety of vanadium-containing systems and, in particular, those containing noninnocent ligands and that have chemical shifts outside the populated range of -300 to -700 ppm. The studies presented in this report demonstrate that the small quadrupolar couplings covering a narrow range of values reflect the symmetric electronic charge distribution, which is also similar across these complexes. These quadrupolar interaction parameters alone are not sufficient to capture the rich electronic structure of these complexes. In contrast, the chemical shift anisotropy tensor elements accessible from (51)V SSNMR experiments are a highly sensitive probe of subtle differences in electronic distribution and orbital occupancy in these compounds. Quantum chemical (density functional theory) calculations of NMR parameters for [VO(hshed)(Cat)] yield a (51)V chemical shift anisotropy tensor in reasonable agreement with the experimental results, but surprisingly the calculated quadrupolar coupling constant is significantly greater than the experimental value. The studies demonstrate that substitution of the catechol ligand with electron-donating groups results in an increase in the HOMO-LUMO gap and can be directly followed by an upfield shift for the vanadium catechol complex. In contrast, substitution of the catechol ligand with electron-withdrawing groups results in a decrease in the HOMO-LUMO gap and can directly be followed by a downfield shift for the complex. The vanadium catechol complexes were used in this work because (51)V is a half-integer quadrupolar nucleus whose NMR observables are highly sensitive to the local environment. However, the results are general and could be extended to other redox-active complexes that exhibit coordination chemistry similar to that of the vanadium catechol complexes.
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Affiliation(s)
- Pabitra B Chatterjee
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, USA
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34
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Li SC, Losovyj Y, Diebold U. Adsorption-site-dependent electronic structure of catechol on the anatase TiO2(101) surface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:8600-8604. [PMID: 21688795 DOI: 10.1021/la201553k] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The adsorption of catechol (1,2-benzendiol) on the anatase TiO(2)(101) surface was studied with synchrotron-based ultraviolet photoemission spectroscopy (UPS), X-ray photoemission spectroscopy (XPS), and scanning tunneling microscopy (STM). Catechol adsorbs with a unity sticking coefficient and the phenyl ring intact. STM reveals preferred nucleation at step edges and subsurface point defects, followed by 1D growth and the formation of a 2 × 1 superstructure at full coverage. A gap state of ∼1 eV above the valence band maximum is observed for dosages in excess of ∼0.4 Langmuir, but such a state is absent for lower coverages. The formation of the band gap states thus correlates with the adsorption at regular lattice sites and the onset of self-assembled superstructures.
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Affiliation(s)
- Shao-Chun Li
- Department of Physics and Engineering Physics, Tulane University , New Orleans, Louisiana 70118, United States
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35
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Cordonier CEJ, Nakamura A, Shimada K, Fujishima A. Photoacid generating ligands for development of positive-tone directly photopatternable metal complexes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:3157-3165. [PMID: 21314151 DOI: 10.1021/la104259f] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Photoacid generating ligands, 4-(2-nitrobenzy-loxycarbonyl)catechol and 4-(6-nitroveratryloxycarbonyl)catechol, and indium tin and titanium complexes thereof, were synthesized. These metal complexes perform as positive-tone, directly photopatternable indium tin oxide (ITO) or titanium oxide film precursors. After exposure, acid-bearing selectively soluble complexes could be removed to give patterned films upon developing in aqueous base, which were transformable to the corresponding pattern-preserving metal oxide film. Micropatterning of ITO and titanium oxide films was accomplished with the photoreactivity of the 2-nitrobenzyloxycarbonyl (NBOC) and 6-nitroveratryloxycarbonyl (NVOC) moiety bearing ligands.
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Affiliation(s)
- Christopher E J Cordonier
- Technology Research and Development Department, Central Japan Railway Company , 1545-33 Ohyama, Komaki City, Aichi, 485-0801 Japan
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Zhang L, Shi J, Jiang Z, Jiang Y, Meng R, Zhu Y, Liang Y, Zheng Y. Facile preparation of robust microcapsules by manipulating metal-coordination interaction between biomineral layer and bioadhesive layer. ACS APPLIED MATERIALS & INTERFACES 2011; 3:597-605. [PMID: 21344913 DOI: 10.1021/am101184h] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A novel approach combining biomimetic mineralization and bioadhesion is proposed to prepare robust and versatile organic-inorganic hybrid microcapsules. More specifically, these microcapsules are fabricated by sequential deposition of inorganic layer and organic layer on the surface of CaCO(3) microparticles, followed by the dissolution of CaCO(3) microparticles using EDTA. During the preparation process, protamine induces the hydrolysis and condensation of titania or silica precursor to form the inorganic layer or the biomineral layer. The organic layer or bioadhesive layer was formed through the rapid, spontaneous oxidative polymerization of dopamine into polydopamine (PDA) on the surface of the biomineral layer. There exist multiple interactions between the inorganic layer and the organic layer. Thus, the as-prepared organic-inorganic hybrid microcapsules acquire much higher mechanical stability and surface reactivity than pure titania or pure silica microcapsules. Furthermore, protamine/titania/polydopamine hybrid microcapsules display superior mechanical stability to protamine/silica/polydopamine hybrid microcapsules because of the formation of Ti(IV)-catechol coordination complex between the biomineral layer and the bioadhesive layer. As an example of application, three enzymes are respectively immobilized through physical encapsulation in the lumen, in situ entrapment within the wall and chemical attachment on the out surface of the hybrid microcapsules. The as-constructed multienzyme system displays higher catalytic activity and operational stability. Hopefully, the approach developed in this study will evolve as a generic platform for facile and controllable preparation of organic-inorganic hybrid materials with different compositions and shapes for a variety of applications in catalysis, sensor, drug/gene delivery.
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Affiliation(s)
- Lei Zhang
- Key Laboratory for Green Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
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Sánchez-de-Armas R, San-Miguel MA, Oviedo J, Márquez A, Sanz JF. Electronic structure and optical spectra of catechol on TiO2nanoparticles from real time TD-DFT simulations. Phys Chem Chem Phys 2011; 13:1506-14. [DOI: 10.1039/c0cp00906g] [Citation(s) in RCA: 92] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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38
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Rodenstein M, Zürcher S, Tosatti SGP, Spencer ND. Fabricating chemical gradients on oxide surfaces by means of fluorinated, catechol-based, self-assembled monolayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:16211-16220. [PMID: 20507138 DOI: 10.1021/la100805z] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Catechols bind strongly to several metal oxides and can thus be used as a binding group for generating self-assembled monolayers. Furthermore, their derivatives can be used to produce well-defined, centimeter-scale surface-chemical gradients on technologically relevant surfaces, such as titanium dioxide (TiO(2)). A simple dip-and-rinse gradient-preparation technique was utilized to produce surface-hydrophobicity gradients from perfluoro-alkyl catechols and nitrodopamine (ND). Chemical composition, quality, and properties of the functionalized surfaces were determined by means of X-ray photoelectron spectroscopy (XPS), variable-angle spectroscopic ellipsometry (VASE), and static water contact angle (sCA) measurements. Contact angles were found to be in the range of 30°-95°, correlating well with the determined surface chemical composition and adlayer thickness.
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Affiliation(s)
- Mathias Rodenstein
- Laboratory for Surface Science and Technology, Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, CH-8093 Zurich, Switzerland
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Macyk W, Szaciłowski K, Stochel G, Buchalska M, Kuncewicz J, Łabuz P. Titanium(IV) complexes as direct TiO2 photosensitizers. Coord Chem Rev 2010. [DOI: 10.1016/j.ccr.2009.12.037] [Citation(s) in RCA: 126] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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40
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Syres K, Thomas A, Bondino F, Malvestuto M, Grätzel M. Dopamine adsorption on anatase TiO2(101): a photoemission and NEXAFS spectroscopy study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:14548-14555. [PMID: 20735026 DOI: 10.1021/la1016092] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The adsorption of dopamine onto an anatase TiO(2)(101) single crystal has been studied using photoemission and NEXAFS techniques. Photoemission results suggest that the dopamine molecule adsorbs on the surface in a bidentate geometry, resulting in the removal of band gap states in the TiO(2) valence band. Using the searchlight effect, carbon K-edge NEXAFS spectra indicate that the phenyl rings in the dopamine molecules are orientated normal to the surface. A combination of experimental and computational results indicates the appearance of new unoccupied states arising following adsorption. The possible role of these states in the charge-transfer mechanism of the dopamine-TiO(2) system is discussed.
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Affiliation(s)
- K Syres
- School of Physics and Astronomy, The Photon Science Institute, Alan Turing Building, The University of Manchester, Oxford Road, Manchester M13 9PL, UK
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41
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Benedict JB, Coppens P. The Crystalline Nanocluster Phase as a Medium for Structural and Spectroscopic Studies of Light Absorption of Photosensitizer Dyes on Semiconductor Surfaces. J Am Chem Soc 2010; 132:2938-44. [DOI: 10.1021/ja909600w] [Citation(s) in RCA: 139] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jason B. Benedict
- Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260-3000
| | - Philip Coppens
- Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260-3000
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Gaweda S, Podborska A, Macyk W, Szaciłowski K. Nanoscale optoelectronic switches and logic devices. NANOSCALE 2009; 1:299-316. [PMID: 20648267 DOI: 10.1039/b9nr00145j] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The photoelectrochemical photocurrent switching (PEPS) effect, in the beginning regarded as a scientific curiosity, has become a field of extensive study for numerous research groups all over the world. This unique effect can be utilized for nanoscale switching and information processing, furthermore, is can serve as an interface between molecular information processing and macroscopic electronics. This review summarizes recent efforts in understanding photocurrent switching effects and their application for the construction of nanoscale switches and logic devices. Furthermore, some future prospects concerning the development of electronic/optoelectronic devices based on photoactive semiconducting hybrid materials are presented.
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Affiliation(s)
- Sylwia Gaweda
- Uniwersytet Jagielloński, Wydział Chemii, Kraków, Poland
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43
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Nawrocka A, Zdyb A, Krawczyk S. Stark spectroscopy of charge-transfer transitions in catechol-sensitized TiO2 nanoparticles. Chem Phys Lett 2009. [DOI: 10.1016/j.cplett.2009.05.060] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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