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Cheng X, Nie S, Huang Y, Liu Q, Wu L, Wang X. Electron-Delocalization Across High Surface Entropy Sub-1 nm Nanobelts Toward Enhanced Electrocatalytic Urea Oxidation. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024:e2404595. [PMID: 38966880 DOI: 10.1002/smll.202404595] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2024] [Revised: 06/26/2024] [Indexed: 07/06/2024]
Abstract
Integration of inherently incompatible elements into a single sublattice, resulting in the formation of monophasic metal oxide, holds great scientific promise; it unveils that the overlooked surface entropy in subnanometer materials can thermodynamically facilitate the formation of homogeneous single-phase structures. Here a facile approach is proposed for synthesizing multimetallic oxide subnanometer nanobelts (MMO-PMA SNBs) by harnessing the potential of phosphomolybdic acid (PMA) clusters to capture inorganic nuclei and inhibiting their subsequent growth in solvothermal reactions. Experimental and theoretical analyses show that PMA in MMO-PMA SNBs not only aids subnanometer structure formation but also induces in situ modifications to catalytic sites. The electron transfer from PMA, coupled with the loss of elemental identity of transition metals, leads to electron delocalization, jointly activating the reaction sites. The unique structure makes pentametallic oxide (PMO-PMA SNBs) achieve a current density of 10 mA cm-2 at a low potential of 1.34 V and remain stable for 24 h at 10 mA cm-2 on urea oxidation reaction (UOR). The exceptional UOR catalytic activity suggests a potential for utilizing multimetallic subnanometer nanostructures in energy conversion and environmental remediation.
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Affiliation(s)
- Xijun Cheng
- Engineering Research Center of Advanced Rare Earth Materials, Department of Chemistry, Tsinghua University, Beijing, 100084, China
| | - Siyang Nie
- Engineering Research Center of Advanced Rare Earth Materials, Department of Chemistry, Tsinghua University, Beijing, 100084, China
| | - Yuan Huang
- Engineering Research Center of Advanced Rare Earth Materials, Department of Chemistry, Tsinghua University, Beijing, 100084, China
| | - Qingda Liu
- Engineering Research Center of Advanced Rare Earth Materials, Department of Chemistry, Tsinghua University, Beijing, 100084, China
| | - Liang Wu
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Xun Wang
- Engineering Research Center of Advanced Rare Earth Materials, Department of Chemistry, Tsinghua University, Beijing, 100084, China
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2
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Li S, Li J, Zhu H, Zhang L, Sang X, Zhu Z, You W, Zhang F. Development of polyoxometalate-based Ag-H 2biim inorganic-organic hybrid compounds functionalized for the acid electrocatalytic hydrogen evolution reaction. Dalton Trans 2023; 52:15725-15733. [PMID: 37843464 DOI: 10.1039/d3dt02820h] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2023]
Abstract
The electrocatalytic hydrogen evolution reaction (HER) is an ideal method for hydrogen production. Transition metal complex electrocatalysts exhibit poor HER activity due to excessive or weak adsorption of H during the electrochemical reduction of water to molecular hydrogen in acidic environments. Developing specific functional complex materials as desired catalysts is challenging. Here, an electrochemical surface restructuring strategy of polyoxometalate (POM)-modified Ag materials toward the HER with a dramatically decreased overpotential under acidic aqueous conditions is established. We prepared two POM [SiW12O40]4- (SiW12)/[P2W18O62]6- (P2W18)-based Ag-2,2'-biimidazole (H2biim) inorganic-organic hybrid compounds (1 and 2) via the hydrothermal method and these two compounds undergo an electrochemical restructuring process in 0.5 M H2SO4 during the HER, in which Ag nanoparticles are in situ formed with the basic structures of SiW12 and P2W18 being maintained. The activated catalysts (1-AC-RDE and 2-AC-RDE) exhibit good electrocatalytic activity for the HER with good long-term stability, and the required overpotentials at a current density of 10 mA cm-2 are 112 mV (1-AC-RDE) and 91 mV (2-AC-RDE) with Tafel slopes of 77 mV dec-1 and 65 mV dec-1, respectively. The excellent electron-proton storage and transferability of SiW12 and P2W18 may provide a solution for the insufficient capture of H by Ag, leading to an effective self-optimizing behavior and superior acidic HER activity.
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Affiliation(s)
- Sifan Li
- School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, Liaoning, China.
- Department of Biochemical Engineering, Chaoyang Teachers College, Chaoyang 122000, Liaoning, China
| | - Jiansheng Li
- School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, Liaoning, China.
- State Key Laboratory of Catalysis, iChEM, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian National Laboratory for Clean Energy, Dalian 116023, Liaoning, China.
| | - Haotian Zhu
- School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, Liaoning, China.
| | - Liyuan Zhang
- School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, Liaoning, China.
| | - Xiaojing Sang
- School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, Liaoning, China.
| | - Zaiming Zhu
- School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, Liaoning, China.
| | - Wansheng You
- School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, Liaoning, China.
| | - Fuxiang Zhang
- State Key Laboratory of Catalysis, iChEM, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian National Laboratory for Clean Energy, Dalian 116023, Liaoning, China.
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Granadeiro CM, Julião D, Ribeiro SO, Cunha-Silva L, Balula SS. Recent advances in lanthanide-coordinated polyoxometalates: from structural overview to functional materials. Coord Chem Rev 2023. [DOI: 10.1016/j.ccr.2022.214914] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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4
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Ghali M, Brahmi C, Benltifa M, Vaulot C, Airoudj A, Fioux P, Dumur F, Simonnet‐Jégat C, Morlet‐Savary F, Jellali S, Bousselmi L, Lalevée J. Characterization of polyoxometalate/polymer photo‐composites: A toolbox for the photodegradation of organic pollutants. JOURNAL OF POLYMER SCIENCE 2020. [DOI: 10.1002/pol.20200568] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Mariem Ghali
- Université de Haute‐Alsace, CNRS, IS2M UMR 7361 F‐68100 Mulhouse France
- Université de Strasbourg Strasbourg France
- Wastewaters and Environment Laboratory, Center for Water Research and Technologies CERTE Soliman Tunisia
- National Institute of Applied Sciences and Technology University of Carthage Tunis Tunisia
| | - Chaima Brahmi
- Université de Haute‐Alsace, CNRS, IS2M UMR 7361 F‐68100 Mulhouse France
- Université de Strasbourg Strasbourg France
- Wastewaters and Environment Laboratory, Center for Water Research and Technologies CERTE Soliman Tunisia
- National Institute of Applied Sciences and Technology University of Carthage Tunis Tunisia
| | - Mahmoud Benltifa
- Wastewaters and Environment Laboratory, Center for Water Research and Technologies CERTE Soliman Tunisia
| | - Cyril Vaulot
- Université de Haute‐Alsace, CNRS, IS2M UMR 7361 F‐68100 Mulhouse France
- Université de Strasbourg Strasbourg France
| | - Aissam Airoudj
- Université de Haute‐Alsace, CNRS, IS2M UMR 7361 F‐68100 Mulhouse France
- Université de Strasbourg Strasbourg France
| | - Philippe Fioux
- Université de Haute‐Alsace, CNRS, IS2M UMR 7361 F‐68100 Mulhouse France
- Université de Strasbourg Strasbourg France
| | | | - Corine Simonnet‐Jégat
- Institut Lavoisier de Versailles, UMR CNRS 8180, Université Paris Saclay, Université de Versailles St‐Quentin en Yvelines Versailles France
| | - Fabrice Morlet‐Savary
- Université de Haute‐Alsace, CNRS, IS2M UMR 7361 F‐68100 Mulhouse France
- Université de Strasbourg Strasbourg France
| | - Salah Jellali
- PEIE Research Chair for the Development of Industrial Estates and Free Zones, Center for Environmental Studies and Research Sultan Qaboos University Muscat Oman
| | - Latifa Bousselmi
- Wastewaters and Environment Laboratory, Center for Water Research and Technologies CERTE Soliman Tunisia
| | - Jacques Lalevée
- Université de Haute‐Alsace, CNRS, IS2M UMR 7361 F‐68100 Mulhouse France
- Université de Strasbourg Strasbourg France
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Chiang TH, Zhou ZX, Hsu JW. The photocatalytic performance of cesium tungsten oxide particles under visible-light irradiation and preparation using a glycothermal process. J Taiwan Inst Chem Eng 2019. [DOI: 10.1016/j.jtice.2018.08.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Balliou A, Bouroushian M, Douvas AM, Skoulatakis G, Kennou S, Glezos N. Size-dependent single electron transfer and semi-metal-to-insulator transitions in molecular metal oxide electronics. NANOTECHNOLOGY 2018; 29:275204. [PMID: 29648551 DOI: 10.1088/1361-6528/aabdc3] [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
All-inorganic self-arranged molecular transition metal oxide hyperstructures based on polyoxometalate molecules (POMs) are fabricated and tested as electronically tunable components in emerging electronic devices. POM hyperstructures reveal great potential as charging nodes of tunable charging level for molecular memories and as enhancers of interfacial electron/hole injection for photovoltaic stacks. STM, UPS, UV-vis spectroscopy and AFM measurements show that this functionality stems from the films' ability to structurally tune their HOMO-LUMO levels and electron localization length at room temperature. By adapting POM nanocluster size in solution, self-doping and current modulation of four orders of magnitude is monitored on a single nanocluster on SiO2 at voltages as low as 3 Volt. Structurally driven insulator-to-semi-metal transitions and size-dependent current regulation through single electron tunneling are demonstrated and examined with respect to the stereochemical and electronic structure of the molecular entities. This extends the value of self-assembly as a tool for correlation length and electronic properties tuning and demonstrate POM hyperstructures' plausibility for on-chip molecular electronics operative at room temperature.
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Affiliation(s)
- Angelika Balliou
- Institute of Nanoscience and Nanotechnology, NCSR Demokritos, Agia Paraskevi Attikis, Athens 15310, Greece. School of Chemical Engineering, National Technical University of Athens, Zografos Campus, 15773, Greece
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7
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Kassem M. Synthesis, physicochemical characterizations, and photocatalytic behaviors of Ni x K2Mo4O13 systems. RESEARCH ON CHEMICAL INTERMEDIATES 2015. [DOI: 10.1007/s11164-013-1397-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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8
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Chamack M, Mahjoub A, Aghayan H. Catalytic performance of vanadium-substituted molybdophosphoric acid supported on zirconium modified mesoporous silica in oxidative desulfurization. Chem Eng Res Des 2015. [DOI: 10.1016/j.cherd.2014.09.017] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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9
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Synthesis and characterization of silver nanoparticle-anchored amine-functionalized mesoporous silica for electrocatalytic determination of nitrite. J Solid State Electrochem 2015. [DOI: 10.1007/s10008-014-2725-3] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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10
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Koutsouroubi ED, Xylouri AK, Armatas GS. Mesoporous polyoxometalate cluster–crosslinked organosilica frameworks delivering exceptionally high photocatalytic activity. Chem Commun (Camb) 2015; 51:4481-4. [DOI: 10.1039/c4cc10029h] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Mesoporous polyoxometalate (POM)-based organosilica frameworks with high catalytic activity, 3D open-pore structure, and uniform pores are prepared via a surfactant-assisted co-polymerization of organically-modified POM clusters with ethane-bridged silsesquioxane linkers.
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Affiliation(s)
| | - Alexandra K. Xylouri
- Department of Materials Science and Technology
- University of Crete
- Heraklion 71003
- Greece
| | - Gerasimos S. Armatas
- Department of Materials Science and Technology
- University of Crete
- Heraklion 71003
- Greece
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11
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Chen L, Yan B. Multi-component assembly and luminescence tuning of lanthanide hybrids through the inside–outside double modification of zeolite A/L. NEW J CHEM 2015. [DOI: 10.1039/c5nj00021a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
A novel inside–outside double modification path is used to functionalize ZA/L to construct multi-component hybrids presenting multi-color luminescence.
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Affiliation(s)
- Lei Chen
- Shanghai Key Lab of Chemical Assessment and Sustainability
- Department of Chemistry
- Tongji University
- Shanghai 200092
- China
| | - Bing Yan
- Shanghai Key Lab of Chemical Assessment and Sustainability
- Department of Chemistry
- Tongji University
- Shanghai 200092
- China
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12
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Granadeiro CM, de Castro B, Balula SS, Cunha-Silva L. Lanthanopolyoxometalates: From the structure of polyanions to the design of functional materials. Polyhedron 2013. [DOI: 10.1016/j.poly.2012.09.037] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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13
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Ultrasound and Microwave Coassisted Synthesis and Luminescent Properties of (Ln = La, Gd; ) Phosphors. J CHEM-NY 2013. [DOI: 10.1155/2013/959765] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
In order to control reaction temperature and reduce processing time, a new method of ultrasound irradiation with microwave heating was used to synthesize (Ln = La, Gd; ) phosphors at only 80°C in 30 minutes. Their crystal structures and morphologies which have been verified by X-ray diffraction (XRD) and scanning electron microscopy (SEM) exhibited gradual changes due to the insertion of lanthanide ions (La or Gd) in calcium molybdates. Codoping of lanthanum ions () would enhance the emission intensities that were supported by fluorescent spectrophotometry (FL).
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14
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Zhang H, Zhou Y, Li Y, Bandosz TJ, Akins DL. Synthesis of hollow ellipsoidal silica nanostructures using a wet-chemical etching approach. J Colloid Interface Sci 2012; 375:106-11. [DOI: 10.1016/j.jcis.2012.02.046] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2011] [Revised: 02/20/2012] [Accepted: 02/21/2012] [Indexed: 11/26/2022]
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15
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Serda RE, Godin B, Blanco E, Chiappini C, Ferrari M. Multi-stage delivery nano-particle systems for therapeutic applications. BIOCHIMICA ET BIOPHYSICA ACTA 2011; 1810:317-29. [PMID: 20493927 PMCID: PMC2948075 DOI: 10.1016/j.bbagen.2010.05.004] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2009] [Revised: 04/27/2010] [Accepted: 05/05/2010] [Indexed: 02/06/2023]
Abstract
BACKGROUND The daunting task for drug molecules to reach pathological lesions has fueled rapid advances in Nanomedicine. The progressive evolution of nanovectors has led to the development of multi-stage delivery systems aimed at overcoming the numerous obstacles encountered by nanovectors on their journey to the target site. SCOPE OF REVIEW This review summarizes major findings with respect to silicon-based drug delivery vectors for cancer therapeutics and imaging. Based on rational design, well-established silicon technologies have been adapted for the fabrication of nanovectors with specific shapes, sizes, and porosities. These vectors are part of a multi-stage delivery system that contains multiple nano-components, each designed to achieve a specific task with the common goal of site-directed delivery of therapeutics. MAJOR CONCLUSIONS Quasi-hemispherical and discoidal silicon microparticles are superior to spherical particles with respect to margination in the blood, with particles of different shapes and sizes having unique distributions in vivo. Cellular adhesion and internalization of silicon microparticles is influenced by microparticle shape and surface charge, with the latter dictating binding of serum opsonins. Based on in vitro cell studies, the internalization of porous silicon microparticles by endothelial cells and macrophages is compatible with cellular morphology, intracellular trafficking, mitosis, cell cycle progression, cytokine release, and cell viability. In vivo studies support superior therapeutic efficacy of liposomal encapsulated siRNA when delivered in multi-stage systems compared to free nanoparticles. This article is part of a Special Issue entitled Nanotechnologies - Emerging Applications in Biomedicine.
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Affiliation(s)
- Rita E. Serda
- University of Texas Health Science Center, Department of NanoMedicine and Biomedical Engineering, 1825 Pressler, Suite 537, Houston, TX 77030, USA
| | - Biana Godin
- University of Texas Health Science Center, Department of NanoMedicine and Biomedical Engineering, 1825 Pressler, Suite 537, Houston, TX 77030, USA
| | - Elvin Blanco
- University of Texas Health Science Center, Department of NanoMedicine and Biomedical Engineering, 1825 Pressler, Suite 537, Houston, TX 77030, USA
| | - Ciro Chiappini
- University of Texas at Austin, Department of Biomedical Engineering, 1 University Station, C0400, Austin, TX 78712
| | - Mauro Ferrari
- University of Texas Health Science Center, Department of NanoMedicine and Biomedical Engineering, 1825 Pressler, Suite 537, Houston, TX 77030, USA
- University of Texas at Austin, Department of Biomedical Engineering, 1 University Station, C0400, Austin, TX 78712
- University of Texas MD Anderson Cancer Center, Department of Experimental Therapeutics, Unit 422, 1515 Holcombe Blvd., Houston, TX 77030, USA
- Rice University, Department of Bioengineering, Houston, TX 77005, USA
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Zhang H, Bandosz TJ, Akins DL. Template-free synthesis of silica ellipsoids. Chem Commun (Camb) 2011; 47:7791-3. [DOI: 10.1039/c1cc11787d] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Serda RE, Mack A, Pulikkathara M, Zaske AM, Chiappini C, Fakhoury J, Webb D, Godin B, Conyers JL, Liu X, Bankson JA, Ferrari M. Cellular association and assembly of a multistage delivery system. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2010; 6:1329-40. [PMID: 20517877 PMCID: PMC3045963 DOI: 10.1002/smll.201000126] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
The realization that blood-borne delivery systems must overcome a multiplicity of biological barriers has led to the fabrication of a multistage delivery system (MDS) designed to temporally release successive stages of particles or agents to conquer sequential barriers, with the goal of enhancing delivery of therapeutic and diagnostic agents to the target site. In its simplest form, the MDS comprises stage-one porous silicon microparticles that function as carriers of second-stage nanoparticles. Cellular uptake of nontargeted discoidal silicon microparticles by macrophages is confirmed by electron and atomic force microscopy (AFM). Using superparamagnetic iron oxide nanoparticles (SPIONs) as a model of secondary nanoparticles, successful loading of the porous matrix of silicon microparticles is achieved, and retention of the nanoparticles is enhanced by aminosilylation of the loaded microparticles with 3-aminopropyltriethoxysilane. The impact of silane concentration and reaction time on the nature of the silane polymer on porous silicon is investigated by AFM and X-ray photoelectron microscopy. Tissue samples from mice intravenously administered the MDS support co-localization of silicon microparticles and SPIONs across various tissues with enhanced SPION release in spleen, compared to liver and lungs, and enhanced retention of SPIONs following silane capping of the MDS. Phantom models of the SPION-loaded MDS display negative contrast in magnetic resonance images. In addition to forming a cap over the silicon pores, the silane polymer provides free amines for antibody conjugation to the microparticles, with both VEGFR-2- and PECAM-specific antibodies leading to enhanced endothelial association. This study demonstrates the assembly and cellular association of a multiparticle delivery system that is biomolecularly targeted and has potential for applications in biological imaging.
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Affiliation(s)
- Rita E. Serda
- University of Texas Health Science Center (UTHSC), Department of Nanomedicine and Biomedical Engineering, 1825 Pressler, Suite 537, Houston, TX 77030
| | - Aaron Mack
- University of Texas Health Science Center (UTHSC), Department of Nanomedicine and Biomedical Engineering, 1825 Pressler, Suite 537, Houston, TX 77030
| | - Merlyn Pulikkathara
- University of Texas Health Science Center (UTHSC), Department of Nanomedicine and Biomedical Engineering, 1825 Pressler, Suite 537, Houston, TX 77030
| | - Ana Maria Zaske
- Center for Translational Injury Research, 6431 Fannin St., MSB 5.422, Houston, TX 77030
| | - Ciro Chiappini
- University of Texas at Austin, Department of Biomedical Engineering, 1 University Station, C0400, Austin, TX 78712
| | - Jean Fakhoury
- University of Texas at Austin, Department of Biomedical Engineering, 1 University Station, C0400, Austin, TX 78712
| | - Douglas Webb
- University of Texas MD Anderson Cancer Center, Department of Imaging Physics, 1515 Holcombe Blvd., Houston, TX 77030
| | - Biana Godin
- University of Texas Health Science Center (UTHSC), Department of Nanomedicine and Biomedical Engineering, 1825 Pressler, Suite 537, Houston, TX 77030
| | - Jodie L. Conyers
- Center for Translational Injury Research, 6431 Fannin St., MSB 5.422, Houston, TX 77030
| | - XueWu Liu
- University of Texas Health Science Center (UTHSC), Department of Nanomedicine and Biomedical Engineering, 1825 Pressler, Suite 537, Houston, TX 77030
| | - James A. Bankson
- University of Texas at Austin, Department of Biomedical Engineering, 1 University Station, C0400, Austin, TX 78712
- University of Texas MD Anderson Cancer Center, Department of Imaging Physics, 1515 Holcombe Blvd., Houston, TX 77030
| | - Mauro Ferrari
- University of Texas Health Science Center (UTHSC), Department of Nanomedicine and Biomedical Engineering, 1825 Pressler, Suite 537, Houston, TX 77030
- University of Texas MD Anderson Cancer Center, Department of Experimental Therapeutics, Unit 422, 1515 Holcombe Blvd., Houston, TX 77030
- Rice University, Department of Bioengineering, Houston, TX 77005
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Aguirre-Etcheverry P, O’Hare D. Electronic Communication through Unsaturated Hydrocarbon Bridges in Homobimetallic Organometallic Complexes. Chem Rev 2010; 110:4839-64. [DOI: 10.1021/cr9003852] [Citation(s) in RCA: 289] [Impact Index Per Article: 20.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Paulina Aguirre-Etcheverry
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford, OX1 3TA
| | - Dermot O’Hare
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford, OX1 3TA
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20
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Armatas GS, Katsoulidis AP, Petrakis DE, Pomonis PJ. Synthesis and acidic catalytic properties of ordered mesoporous alumina–tungstophosphoric acid composites. ACTA ACUST UNITED AC 2010. [DOI: 10.1039/c0jm01283a] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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22
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Affiliation(s)
- Koen Binnemans
- Katholieke Universiteit Leuven, Department of Chemistry, Celestijnenlaan 200F, bus 2404, B-3001 Leuven, Belgium
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Yin S, Sun H, Yan Y, Li W, Wu L. Hydrogen-bonding-induced supramolecular liquid crystals and luminescent properties of europium-substituted polyoxometalate hybrids. J Phys Chem B 2009; 113:2355-64. [PMID: 19193055 DOI: 10.1021/jp810262c] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Eu-containing polyoxometalates, Na9EuW10O36, K11Eu(PW11O39)2, and K13Eu(SiW11O39)2, were electrostatically canned by a cationic surfactant, N-[12-(4-carboxylphenoxy)dodecyl]-N-dodecyl-N,N-dimethylammonium bromide, through the replacement of counterions, and the resulting surfactant-encapsulated polyoxometalate complexes were characterized in detail by elemental analysis as well as IR and NMR spectra. The carboxyls bearing in the complexes were confirmed existing in the dimer state through intermolecular hydrogen bonding, which leads to stable and reversible thermotropic liquid crystal properties of these complexes. The results of differential scanning calorimetry, polarized optical microscopy, and X-ray diffraction revealed that these complexes underwent smectic mesophases during the heating and cooling cycles. These complexes displayed intrinsic luminescence both in the amorphous powder states and in their mesophases. The photophysical properties showed the dependence on the existing states of samples, and the quantum yields of the complexes in the liquid crystalline structures are higher than the corresponding amorphous powders. The present investigation provides an example for developing hydrogen-bonding-induced polyoxometalate-containing hybrid liquid crystal materials with intrinsic luminescence.
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Affiliation(s)
- Shengyan Yin
- State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, P. R. China
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Li Y, Xu L, Gao G, Jiang N, Liu H, Li F, Yang Y. New fabrication of lanthanide complexes based on the polyoxometalate ligand of the [α(1,4)-GeW10O38]12− anion. CrystEngComm 2009. [DOI: 10.1039/b820269a] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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25
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Tiseanu C, Kumke MU, Parvulescu VI, Gessner A, Gagea B, Martens J. Europium(3+): An Efficient Luminescence Probe for the Si to Al Ratio and Silylation Effects in the Microporous−Mesoporous Zeogrid Materials. J Phys Chem B 2008; 112:10552-62. [DOI: 10.1021/jp711337h] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- C. Tiseanu
- National Institute for Laser, Plasma and Radiation Physics, P.O. Box MG-36, RO 76900, Bucharest−Magurele, Romania, Institute of Chemistry, Physical Chemistry, University of Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam−Golm, Germany, Department of Chemical Technology and Catalysis, University of Bucharest, 4-12 Regina Elisabeta Boulevard, Bucharest 030016, Romania, and Centre for Surface Chemistry and Catalysis, Katholieke Universiteit Leuven, 23 Kasteelpark Arenberg, B-3001 Leuven (Heverlee),
| | - M. U. Kumke
- National Institute for Laser, Plasma and Radiation Physics, P.O. Box MG-36, RO 76900, Bucharest−Magurele, Romania, Institute of Chemistry, Physical Chemistry, University of Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam−Golm, Germany, Department of Chemical Technology and Catalysis, University of Bucharest, 4-12 Regina Elisabeta Boulevard, Bucharest 030016, Romania, and Centre for Surface Chemistry and Catalysis, Katholieke Universiteit Leuven, 23 Kasteelpark Arenberg, B-3001 Leuven (Heverlee),
| | - V. I. Parvulescu
- National Institute for Laser, Plasma and Radiation Physics, P.O. Box MG-36, RO 76900, Bucharest−Magurele, Romania, Institute of Chemistry, Physical Chemistry, University of Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam−Golm, Germany, Department of Chemical Technology and Catalysis, University of Bucharest, 4-12 Regina Elisabeta Boulevard, Bucharest 030016, Romania, and Centre for Surface Chemistry and Catalysis, Katholieke Universiteit Leuven, 23 Kasteelpark Arenberg, B-3001 Leuven (Heverlee),
| | - A. Gessner
- National Institute for Laser, Plasma and Radiation Physics, P.O. Box MG-36, RO 76900, Bucharest−Magurele, Romania, Institute of Chemistry, Physical Chemistry, University of Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam−Golm, Germany, Department of Chemical Technology and Catalysis, University of Bucharest, 4-12 Regina Elisabeta Boulevard, Bucharest 030016, Romania, and Centre for Surface Chemistry and Catalysis, Katholieke Universiteit Leuven, 23 Kasteelpark Arenberg, B-3001 Leuven (Heverlee),
| | - B. Gagea
- National Institute for Laser, Plasma and Radiation Physics, P.O. Box MG-36, RO 76900, Bucharest−Magurele, Romania, Institute of Chemistry, Physical Chemistry, University of Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam−Golm, Germany, Department of Chemical Technology and Catalysis, University of Bucharest, 4-12 Regina Elisabeta Boulevard, Bucharest 030016, Romania, and Centre for Surface Chemistry and Catalysis, Katholieke Universiteit Leuven, 23 Kasteelpark Arenberg, B-3001 Leuven (Heverlee),
| | - J. Martens
- National Institute for Laser, Plasma and Radiation Physics, P.O. Box MG-36, RO 76900, Bucharest−Magurele, Romania, Institute of Chemistry, Physical Chemistry, University of Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam−Golm, Germany, Department of Chemical Technology and Catalysis, University of Bucharest, 4-12 Regina Elisabeta Boulevard, Bucharest 030016, Romania, and Centre for Surface Chemistry and Catalysis, Katholieke Universiteit Leuven, 23 Kasteelpark Arenberg, B-3001 Leuven (Heverlee),
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Chen L, Zhu K, Bi LH, Suchopar A, Reicke M, Mathys G, Jaensch H, Kortz U, Richards RM. Solvent-Free Aerobic Oxidation of n-Alkane by Iron(III)-Substituted Polyoxotungstates Immobilized on SBA-15. Inorg Chem 2007; 46:8457-9. [PMID: 17854179 DOI: 10.1021/ic701178a] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The tetrairon(III)-substituted polytungstates [Fe(4)(H(2)O)(10)(beta-XW(9)O(33))(2)](n-) (n = 6, X = As(III), Sb(III); n = 4, X = Se(IV), Te(IV)) were immobilized on (3-aminopropyl)triethoxysilane-modified SBA-15 and showed an excellent catalytic performance for solvent-free aerobic oxidation of long-chain n-alkanes using air as the oxidant under ambient conditions through a classical free-radical chain autoxidation mechanism.
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Affiliation(s)
- Lifang Chen
- School of Engineering and Science, Jacobs University Bremen, P.O. Box 750561, 28725 Bremen, Germany
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Wickramasinghe NP, Shaibat MA, Ishii Y. Elucidating Connectivity and Metal-Binding Structures of Unlabeled Paramagnetic Complexes by 13C and 1H Solid-State NMR under Fast Magic Angle Spinning. J Phys Chem B 2007; 111:9693-6. [PMID: 17661508 DOI: 10.1021/jp0727289] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Characterizing paramagnetic complexes in solids is an essential step toward understanding their molecular functions. However, methodologies to characterize chemical and electronic structures of paramagnetic systems at the molecular level have been notably limited, particularly for noncrystalline solids. We present an approach to obtain connectivities of chemical groups and metal-binding structures for unlabeled paramagnetic complexes by 13C and 1H high-resolution solid-state NMR (SSNMR) using very fast magic angle spinning (VFMAS, spinning speed >or=20 kHz). It is experimentally shown for unlabeled Cu(II)(Ala-Thr) that 2D 13C/1H correlation SSNMR under VFMAS provides the connectivity of chemical groups and assignments for the characterization of unlabeled paramagnetic systems in solids. We demonstrate that on the basis of the assignments provided by the VFMAS approach multiple 13C-metal distances can be simultaneously elucidated by a combination of measurements of 13C anisotropic hyperfine shifts and 13C T1 relaxation due to hyperfine interactions for this peptide-Cu(II) complex. It is also shown that an analysis of 1H anisotropic hyperfine shifts allows for the determination of electron-spin states in Fe(III)-chloroprotoporphyin-IX in solid states.
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Peng Q, He D. Hydroformylation of mixed octenes over immobilized Co-Ph3PO/PDMS/SiO2 catalyst. Catal Letters 2007. [DOI: 10.1007/s10562-007-9050-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Wickramasinghe NP, Ishii Y. Sensitivity enhancement, assignment, and distance measurement in 13C solid-state NMR spectroscopy for paramagnetic systems under fast magic angle spinning. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2006; 181:233-43. [PMID: 16750405 DOI: 10.1016/j.jmr.2006.05.008] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2006] [Revised: 05/11/2006] [Accepted: 05/11/2006] [Indexed: 05/10/2023]
Abstract
Despite success of previous studies, high-resolution solid-state NMR (SSNMR) of paramagnetic systems has been still largely unexplored because of limited sensitivity/resolution and difficulty in assignment due to large paramagnetic shifts. Recently, we demonstrated that an approach using very-fast magic angle spinning (VFMAS; spinning speed 20kHz) enhances resolution/sensitivity in (13)C SSNMR for paramagnetic complexes [Y. Ishii, S. Chimon, N.P. Wickramasinghe, A new approach in 1D and 2D (13)C high resolution solid-state NMR spectroscopy of paramagnetic organometallic complexes by very fast magic-angle spinning, J. Am. Chem. Soc. 125 (2003) 3438-3439]. In this study, we present a new strategy for sensitivity enhancement, signal assignment, and distance measurement in (13)C SSNMR under VFMAS for unlabeled paramagnetic complexes using recoupling-based polarization transfer. As a robust alternative of cross-polarization (CP), rapid application of recoupling-based polarization transfer under VFMAS is proposed. In the present approach, a dipolar-based analog of INEPT (dipolar INEPT) methods is used for polarization transfer and a (13)C signal is observed under VFMAS without (1)H decoupling. The resulting low duty factor permits rapid signal accumulation without probe arcing at recycle times ( approximately 3 ms/scan) matched to short (1)H T(1) values of small paramagnetic systems ( approximately 1 ms). Experiments on Cu(dl-Ala)(2) showed that the fast repetition approach under VFMAS provided sensitivity enhancement by a factor of 8-66 for a given sample, compared with the (13)C MAS spectrum under moderate MAS at 5kHz. The applicability of this approach was also demonstrated for a more challenging system, Mn(acac)(3), for which (13)C and (1)H paramagnetic shift dispersions reach 1500 and 700 ppm, respectively. It was shown that effective-evolution-time dependence of transferred signals in dipolar INEPT permitted one to distinguish (13)CH, (13)CH(2), (13)CH(3), (13)CO2- groups in 1D experiments for Cu(DL-Ala)(2) and Cu(Gly)(2). Applications of this technique to 2D (13)C/(1)H correlation NMR under VFMAS yielded reliable assignments of (1)H resonances as well as (13)C resonances for Cu(DL-Ala)(2) and Mn(acac)(3). Quantitative analysis of cross-peak intensities in 2D (13)C/(1)H correlation NMR spectra of Cu(DL-Ala)(2) provided distance information between non-bonded (13)C-(1)H pairs in the paramagnetic system.
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