101
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Wei M, Fu Q, Dong A, Wang ZJ, Bao X. Coverage and Substrate Effects on the Structural Change of FeOx Nanostructures Supported on Pt. Top Catal 2014. [DOI: 10.1007/s11244-014-0248-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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102
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Martín S, Pera G, Ballesteros LM, Hope AJ, Marqués-González S, Low PJ, Pérez-Murano F, Nichols RJ, Cea P. Towards the Fabrication of the Top-Contact Electrode in Molecular Junctions by Photoreduction of a Metal Precursor. Chemistry 2014; 20:3421-6. [DOI: 10.1002/chem.201303967] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2013] [Indexed: 11/06/2022]
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103
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Bubniene U, Oćwieja M, Bugelyte B, Adamczyk Z, Nattich-Rak M, Voronovic J, Ramanaviciene A, Ramanavicius A. Deposition of gold nanoparticles on mica modified by poly(allylamine hydrochloride) monolayers. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2013.08.058] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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104
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Dabiri M, Shariatipour M, Kazemi Movahed S, Bashiribod S. Water-dispersible and magnetically separable gold nanoparticles supported on a magnetite/s-graphene nanocomposite and their catalytic application in the Ullmann coupling of aryl iodides in aqueous media. RSC Adv 2014. [DOI: 10.1039/c4ra04479g] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
The water-dispersible and magnetic separable Au/Fe3O4/s-G nanocomposite was used as an effective and reusable heterogeneous catalyst for the Ullmann homocoupling.
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Affiliation(s)
- Minoo Dabiri
- Faculty of Chemistry
- Shahid Beheshti University
- Tehran, Islamic Republic of Iran
| | - Monire Shariatipour
- Faculty of Chemistry
- Shahid Beheshti University
- Tehran, Islamic Republic of Iran
| | | | - Sahareh Bashiribod
- Department of Marine Biology
- Faculty of Biological Sciences
- Shahid Beheshti University
- Tehran, Iran
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105
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Tang X, Schneider J, Dollinger A, Luo Y, Wörz AS, Judai K, Abbet S, Kim YD, Ganteför GF, Fairbrother DH, Heiz U, Bowen KH, Proch S. Very small “window of opportunity” for generating CO oxidation-active Aun on TiO2. Phys Chem Chem Phys 2014; 16:6735-42. [DOI: 10.1039/c4cp00160e] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The probability of creating CO oxidation-active species on TiO2 is very small since only Au6 and Au7 are catalytically active.
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Affiliation(s)
- X. Tang
- Department of Chemistry
- Johns Hopkins University
- Baltimore, USA
| | - J. Schneider
- Fachbereich für Physik
- Universität Konstanz
- Konstanz, Germany
| | - A. Dollinger
- Fachbereich für Physik
- Universität Konstanz
- Konstanz, Germany
| | - Y. Luo
- Department of Chemistry
- Sungkyunkwan University
- Suwon, Republic of Korea
| | - A. S. Wörz
- Lehrstuhl für Physikalische Chemie
- Technische Universität München
- Garching, Germany
| | - K. Judai
- College of Humanities and Sciences
- Nihon University
- Tokyo, Japan
| | - S. Abbet
- CO Derborence
- Conthey, Switzerland
| | - Y. D. Kim
- Department of Chemistry
- Sungkyunkwan University
- Suwon, Republic of Korea
| | - G. F. Ganteför
- Fachbereich für Physik
- Universität Konstanz
- Konstanz, Germany
| | | | - U. Heiz
- Lehrstuhl für Physikalische Chemie
- Technische Universität München
- Garching, Germany
| | - K. H. Bowen
- Department of Chemistry
- Johns Hopkins University
- Baltimore, USA
| | - S. Proch
- Fachbereich für Physik
- Universität Konstanz
- Konstanz, Germany
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106
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Plant SR, Cao L, Yin F, Wang ZW, Palmer RE. Size-dependent propagation of Au nanoclusters through few-layer graphene. NANOSCALE 2014; 6:1258-63. [PMID: 24242001 DOI: 10.1039/c3nr04770a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
We report the size-dependent propagation of gold nanoclusters through few-layer graphene (FLG). We employ aberration-corrected scanning transmission electron microscopy (STEM) to track the fate of Au55 and Au923 clusters that have been deposited, independently and isoenergetically, onto suspended FLG films using cluster beam deposition. We demonstrate that Au55 clusters penetrate through the FLG, whereas the monodisperse Au923 clusters reside at the surface. Our approach offers a route to the controlled incorporation of dopant nanoparticles and the generation of nanoscale defects in graphene.
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Affiliation(s)
- Simon R Plant
- Nanoscale Physics Research Laboratory, School of Physics and Astronomy, University of Birmingham, Birmingham, B15 2TT, UK.
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107
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Rajakumar P, Anandhan R, Manoj D, Santhanalakshmi J. Synthesis, H2PO4−and Pd2+ion sensing and gold nanoparticle encapsulation of ferrocenyldendrimers by a green chemistry approach. RSC Adv 2014. [DOI: 10.1039/c3ra43238f] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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108
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Zhang QL, Feng JX, Wang AJ, Wei J, Feng JJ. Simple synthesis of bimetallic alloyed Pd–Au nanochain networks supported on reduced graphene oxide for enhanced oxygen reduction reaction. RSC Adv 2014. [DOI: 10.1039/c4ra10746b] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
A simple and rapid wet-chemical co-reduction method was developed for synthesis of alloyed Pd–Au nanochain networks supported on RGO, with the assistance of caffeine as a capping agent and a structure directing agent.
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Affiliation(s)
- Qian-Li Zhang
- College of Chemistry and Life Science
- College of Geography and Environmental Science
- Zhejiang Normal University
- Jinhua 321004, China
- School of Chemistry and Biological Engineering
| | - Jin-Xia Feng
- School of Chemistry and Biological Engineering
- Suzhou University of Science and Technology
- Suzhou, China
| | - Ai-Jun Wang
- College of Chemistry and Life Science
- College of Geography and Environmental Science
- Zhejiang Normal University
- Jinhua 321004, China
| | - Jie Wei
- College of Chemistry and Life Science
- College of Geography and Environmental Science
- Zhejiang Normal University
- Jinhua 321004, China
| | - Jiu-Ju Feng
- College of Chemistry and Life Science
- College of Geography and Environmental Science
- Zhejiang Normal University
- Jinhua 321004, China
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109
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Mingos DMP. Historical Introduction to Gold Colloids, Clusters and Nanoparticles. STRUCTURE AND BONDING 2014. [DOI: 10.1007/430_2013_138] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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110
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Haruta M. Chance and necessity: my encounter with gold catalysts. Angew Chem Int Ed Engl 2013; 53:52-6. [PMID: 24285610 DOI: 10.1002/anie.201305987] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2013] [Indexed: 11/11/2022]
Abstract
"Have you tried gold?" This question after a presentation on hydrogen oxidation steered Masatake Haruta's research on heterogeneous catalysis. He found that gold combined with 3d transition metal oxides could exhibit surprisingly high catalytic activity for carbon monoxide oxidation at temperatures as low as 203 K.
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Affiliation(s)
- Masatake Haruta
- Research Center for Gold Chemistry, Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-osawa, Hachioji, Tokyo 192-0379 (Japan); Gold Catalysis Research Center, Dalian Institute of Chemical Physics, 457 Zhongshan Road, Dalian 116023 (P. R. China).
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111
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112
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He X, Yang H. Au nanoparticles assembled on palygorskite: Enhanced catalytic property and Au–Au2O3 coexistence. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.molcata.2013.08.024] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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113
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Fong YY, Gascooke JR, Visser BR, Harris HH, Cowie BCC, Thomsen L, Metha GF, Buntine MA. Influence of cationic surfactants on the formation and surface oxidation states of gold nanoparticles produced via laser ablation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:12452-12462. [PMID: 24015926 DOI: 10.1021/la402234k] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We report on the time evolution of gold nanoparticles produced by laser ablation in the presence of the cationic surfactants cetyltrimethylammonium bromide (CTAB) and cetyltrimethylammonium chloride (CTAC) in aqueous solution. The broader applicability of a laser-induced nanoparticle formation kinetic model previously developed by us for the case of anionic surfactants in aqueous solution [ J. Phys. Chem. C 2010 , 114 , 15931 - 15940 ] is shown to also apply in the presence of cationic surfactants. We explore the surface properties of the nanoparticles produced in the presence of the cationic surfactants via synchrotron X-ray photoelectron spectroscopy (XPS). The XPS data indicate that at CTA(+) concentrations approximating the aqueous critical micelle concentration Au(III) is present on the nanoparticle surface. Such oxidation is not observed at (i) lower CTA(+) concentrations, (ii) in the presence of an anionic surfactant, or (iii) in the case of pure water as a solvent.
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Affiliation(s)
- Yuen-Yan Fong
- Department of Chemistry, The University of Adelaide , Adelaide SA 5005, Australia
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114
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Li HJ, Yeh CH, Ho JJ. The catalytic adsorption and dissociation of carbon dioxide on a double icosahedral Ru19 nanocluster – A theoretical study. Chem Phys Lett 2013. [DOI: 10.1016/j.cplett.2013.08.106] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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115
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Li SF, Zhao XJ, Xu XS, Gao YF, Zhang Z. Stacking principle and magic sizes of transition metal nanoclusters based on generalized Wulff construction. PHYSICAL REVIEW LETTERS 2013; 111:115501. [PMID: 24074104 DOI: 10.1103/physrevlett.111.115501] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2013] [Indexed: 06/02/2023]
Abstract
Nanoclusters with extra stability at certain cluster sizes are known as magic clusters with exotic properties. The classic Wulff construction principle, which stipulates that the preferred structure of a cluster should minimize its total surface energy, is often invoked in determining the cluster magicity, resulting in close-shelled Mackay icosahedronal clusters with odd-numbered magic sizes of 13, 55, 147, etc. Here we use transition metal clusters around size 55 as prototypical examples to demonstrate that, in the nanometer regime, the classic Wulff construction principle needs to be generalized to primarily emphasize the edge atom effect instead of the surface energy. Specifically, our detailed calculations show that nanoclusters with much shorter total edge lengths but substantially enlarged total surface areas are energetically much more stable. As a consequence, a large majority of the nanoclusters within the 3d-, 4d-, and 5d-transition metal series are found to be fcc or hcp crystal fragments with much lower edge energies, and the widely perceived magic size of 55 is shifted to its nearby even numbers.
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Affiliation(s)
- S F Li
- School of Physics and Engineering, Zhengzhou University, Zhengzhou, Henan 450001, China and Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA and Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA and ICQD, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
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116
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Ethirajan A, Punniyakoti S, D'Olieslaeger M, Wagner P, Boyen HG. Ultrafast Self-Assembly Using Ultrasound: A Facile Route to the Rapid Fabrication of Well-Ordered Dense Arrays of Inorganic Nanostructures. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201301980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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117
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118
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Zhang L, Ren T, Zhou L, Tian J, Li X. DFT investigation of the intermolecular interactions of a thieno-separated tricyclic guanine analog with gold nanoclusters. COMPUT THEOR CHEM 2013. [DOI: 10.1016/j.comptc.2013.06.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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119
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Physical and Chemical Consequences of Size-Reduction of Gold: Bioresponse and Biodistribution. J CLUST SCI 2013. [DOI: 10.1007/s10876-013-0619-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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120
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Li CY, Karna SK, Wang CW, Li WH. Spin polarization and quantum spins in Au nanoparticles. Int J Mol Sci 2013; 14:17618-42. [PMID: 23989607 PMCID: PMC3794745 DOI: 10.3390/ijms140917618] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2013] [Revised: 08/01/2013] [Accepted: 08/05/2013] [Indexed: 11/24/2022] Open
Abstract
The present study focuses on investigating the magnetic properties and the critical particle size for developing sizable spontaneous magnetic moment of bare Au nanoparticles. Seven sets of bare Au nanoparticle assemblies, with diameters from 3.5 to 17.5 nm, were fabricated with the gas condensation method. Line profiles of the X-ray diffraction peaks were used to determine the mean particle diameters and size distributions of the nanoparticle assemblies. The magnetization curves M(Ha) reveal Langevin field profiles. Magnetic hysteresis was clearly revealed in the low field regime even at 300 K. Contributions to the magnetization from different size particles in the nanoparticle assemblies were considered when analyzing the M(Ha) curves. The results show that the maximum particle moment will appear in 2.4 nm Au particles. A similar result of the maximum saturation magnetization appearing in 2.3 nm Au particles is also concluded through analysis of the dependency of the saturation magnetization MP on particle size. The MP(d) curve departs significantly from the 1/d dependence, but can be described by a log-normal function. Magnetization can be barely detected for Au particles larger than 27 nm. Magnetic field induced Zeeman magnetization from the quantum confined Kubo gap opening appears in Au nanoparticles smaller than 9.5 nm in diameter.
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Affiliation(s)
- Chi-Yen Li
- Department of Physics and Center for Neutron Beam Applications, National Central University, Jhongli 32001, Taiwan.
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121
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Chong H, Li P, Xiang J, Fu F, Zhang D, Ran X, Zhu M. Design of an ultrasmall Au nanocluster-CeO2 mesoporous nanocomposite catalyst for nitrobenzene reduction. NANOSCALE 2013; 5:7622-8. [PMID: 23842689 DOI: 10.1039/c3nr01977b] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
In this work we are inspired to explore gold nanoclusters supported on mesoporous CeO2 nanospheres as nanocatalysts for the reduction of nitrobenzene. Ultrasmall Au nanoclusters (NCs) and mesoporous CeO2 nanospheres were readily synthesized and well characterized. Due to their ultrasmall size, the as-prepared Au clusters can be easily absorbed into the mesopores of the mesoporous CeO2 nanospheres. Owing to the unique mesoporous structure of the CeO2 support, Au nanoclusters in the Au@CeO2 may effectively prevent the aggregation which usually results in a rapid decay of the catalytic activity. It is notable that the ultrasmall gold nanoclusters possess uniform size distribution and good dispersibility on the mesoporous CeO2 supports. Compared to other catalyst systems with different oxide supports, the as-prepared Au nanocluster-CeO2 nanocomposite nanocatalysts showed efficient catalytic performance in transforming nitrobenzene into azoxybenzene. In addition, a plausible mechanism was deeply investigated to explain the transforming process. Au@CeO2 exhibited efficient catalytic activity for reduction of nitrobenzene. This strategy may be easily extended to fabricate many other heterogeneous catalysts including ultrasmall metal nanoclusters and mesoporous oxides.
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Affiliation(s)
- Hanbao Chong
- College of Chemistry and Chemical Engineering, Anhui University, Hefei, 230601, PR China
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122
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Ethirajan A, Punniyakoti S, D'Olieslaeger M, Wagner P, Boyen HG. Ultrafast Self-Assembly Using Ultrasound: A Facile Route to the Rapid Fabrication of Well-Ordered Dense Arrays of Inorganic Nanostructures. Angew Chem Int Ed Engl 2013; 52:9709-13. [DOI: 10.1002/anie.201301980] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2013] [Revised: 06/09/2013] [Indexed: 11/10/2022]
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123
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Leifert A, Pan-Bartnek Y, Simon U, Jahnen-Dechent W. Molecularly stabilised ultrasmall gold nanoparticles: synthesis, characterization and bioactivity. NANOSCALE 2013; 5:6224-42. [PMID: 23743952 DOI: 10.1039/c3nr00916e] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Gold nanoparticles (AuNPs) are widely used as contrast agents in electron microscopy as well as for diagnostic tests. Due to their unique optical and electrical properties and their small size, there is also a growing field of potential applications in medical fields of imaging and therapy, for example as drug carriers or as active compounds in thermotherapy. Besides their intrinsic optical properties, facile surface decoration with (bio)functional ligands renders AuNPs ideally suited for many industrial and medical applications. However, novel AuNPs may have toxicological profiles differing from bulk and therefore a thorough analysis of the quantitative structure-activity relationship (QSAR) is required. Several mechanisms are proposed that cause adverse effects of nanoparticles in biological systems. Catalytic generation of reactive species due to the large and chemically active surface area of nanomaterials is well established. Because nanoparticles approach the size of biological molecules and subcellular structures, they may overcome natural barriers by active or passive uptake. Ultrasmall AuNPs with sizes of 2 nm or less may even behave as molecular ligands. These types of potential interactions would imply a size and ligand-dependent behaviour of any nanomaterial towards biological systems. Thus, to fully understand their QSAR, AuNPs bioactivity should be analysed in biological systems of increasing complexity ranging from cell culture to whole animal studies.
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Affiliation(s)
- Annika Leifert
- RWTH Aachen University, Helmholtz Institute for Biomedical Engineering, Biointerface Laboratory, Pauwelsstrasse 30, 52074 Aachen, Germany
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124
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Sitja G, Le Moal S, Marsault M, Hamm G, Leroy F, Henry CR. Transition from molecule to solid state: reactivity of supported metal clusters. NANO LETTERS 2013; 13:1977-1982. [PMID: 23537306 DOI: 10.1021/nl304741t] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The evolution of the adsorption energy of carbon monoxide (CO) molecules on palladium (Pd) clusters as function of Pd particle size from the molecular regime (less than ~100 atoms per particle) to the bulk regime has been revealed. This adsorption energy is retrieved from the residence time of CO molecules on the Pd clusters, measured by a pulsed molecular beam technique, versus temperature. Unprecedented accuracy on the determination of the particle size has been achieved here by using a regular array of metal clusters exhibiting a size dispersion down to the ultimate limit of a Poisson distribution. This allows getting rid of the convolution effects that generally occur when considering particles grown through other techniques.
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Affiliation(s)
- Georges Sitja
- Centre Interdisciplinaire de Nanoscience de Marseille, Aix-Marseille Université/CNRS, UMR 7325, Campus de Luminy, Case 913, F-13288 Marseille cedex 09, France.
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125
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126
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A comparative study of the deactivation mechanisms of the Au/CeO2 catalyst for water–gas shift under steady-state and shutdown/start-up conditions in realistic reformate. J Catal 2013. [DOI: 10.1016/j.jcat.2013.01.001] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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127
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Mikami Y, Dhakshinamoorthy A, Alvaro M, García H. Catalytic activity of unsupported gold nanoparticles. Catal Sci Technol 2013. [DOI: 10.1039/c2cy20068f] [Citation(s) in RCA: 184] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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128
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Wang L, Zhang B, Zhang W, Zhang J, Gao X, Meng X, Su DS, Xiao FS. Positively charged bulk Au particles as an efficient catalyst for oxidation of styrene with molecular oxygen. Chem Commun (Camb) 2013; 49:3449-51. [DOI: 10.1039/c3cc00309d] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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129
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Antosova A, Gazova Z, Fedunova D, Valusova E, Bystrenova E, Valle F, Daxnerova Z, Biscarini F, Antalik M. Anti-amyloidogenic activity of glutathione-covered gold nanoparticles. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2012. [DOI: 10.1016/j.msec.2012.07.036] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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130
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Chu X, Yao G, Wee ATS, Wang XS. Size-tunable Au nanoparticles on MoS2(0001). NANOTECHNOLOGY 2012; 23:375603. [PMID: 22922593 DOI: 10.1088/0957-4484/23/37/375603] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Ultra-fine Au nanoparticles (NPs) show great application potential in catalysis. Size-tunable Au NPs have been fabricated on MoS(2) covered with monolayer 3,4,5,10-perylene tetracarboxylic dianhydride (PTCDA), and the morphological evolution as a function of Au deposition amount was investigated using scanning tunneling microscopy (STM). The PTCDA molecules act as a surfactant to stabilize ultra-fine Au NPs. Molecular scale STM images show that on MoS(2) the Au NPs with PTCDA molecules on top can be formed with height and lateral size down to 1.3 nm and 3.5 nm, respectively. By controlling the deposition amount and annealing temperature, the size of Au NPs can be tuned. After annealing at 270 °C to remove PTCDA, Au NPs with a linear size ≤5 nm can be obtained on MoS(2)(0001), facilitating the characterization of their intrinsic physical and chemical properties using various analytical techniques. In addition, photoemission spectroscopy data reveal charge transfer from Au NPs to PTCDA, indicating that the NPs possess more reactive chemical properties than bulk Au.
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Affiliation(s)
- Xinjun Chu
- Department of Physics, National University of Singapore, Singapore
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131
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132
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Son JS, Park K, Kwon SG, Yang J, Choi MK, Kim J, Yu JH, Joo J, Hyeon T. Dimension-controlled synthesis of CdS nanocrystals: from 0D quantum dots to 2D nanoplates. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2012; 8:2394-402. [PMID: 22641481 DOI: 10.1002/smll.201200506] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2012] [Indexed: 05/06/2023]
Abstract
The dimension-controlled synthesis of CdS nanocrystals in the strong quantum confinement regime is reported. Zero-, one-, and two-dimensional CdS nanocrystals are selectively synthesized via low-temperature reactions using alkylamines as surface-capping ligands. The shape of the nanocrystals is controlled systematically by using different amines and reaction conditions. The 2D nanoplates have a uniform thickness as low as 1.2 nm. Furthermore, their optical absorption and emission spectra show very narrow peaks indicating extremely uniform thickness. It is demonstrated that 2D nanoplates are generated by 2D assembly of CdS magic-sized clusters formed at the nucleation stage, and subsequent attachment of the clusters. The stability of magic-sized clusters in amine solvent strongly influences the final shapes of the nanocrystals. The thickness of the nanoplates increases in a stepwise manner while retaining their uniformity, similar to the growth behavior of inorganic clusters. The 2D CdS nanoplates are a new type of quantum well with novel nanoscale properties in the strong quantum confinement regime.
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Affiliation(s)
- Jae Sung Son
- World Class University (WCU) Program of Chemical, Convergence for Energy & Environment (C2E2), School of Chemical and Biological Engineering, Seoul National University, Seoul 151-744, Korea
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133
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Kitazawa H, Albrecht K, Yamamoto K. Synthesis of a Dendrimer Reactor for Clusters with a Magic Number. CHEM LETT 2012. [DOI: 10.1246/cl.2012.828] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
| | - Ken Albrecht
- Chemical Resources Laboratory, Tokyo Institute of Technology
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134
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Kim G, Kang SH, Lim CY, Kwon YK. Binding properties of a nitrogen atom onto an anionic golden fullerene. Chem Phys Lett 2012. [DOI: 10.1016/j.cplett.2012.07.025] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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135
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Vesel A, Kolar M, Doliska A, Stana-Kleinschek K, Mozetic M. Etching of polyethylene terephthalate thin films by neutral oxygen atoms in the late flowing afterglow of oxygen plasma. SURF INTERFACE ANAL 2012. [DOI: 10.1002/sia.5064] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Alenka Vesel
- Plasma laboratory; Institute Jozef Stefan; Jamova 39 Ljubljana Slovenia
| | - Metod Kolar
- Jozef Stefan International Postgraduate School; Jamova 39 Ljubljana Slovenia
| | - Ales Doliska
- Laboratory for Characterization and Processing of Polymers, Faculty of Mechanical Engineering; University of Maribor; Smetanova 17 SI-2000 Maribor Slovenia
| | - Karin Stana-Kleinschek
- Laboratory for Characterization and Processing of Polymers, Faculty of Mechanical Engineering; University of Maribor; Smetanova 17 SI-2000 Maribor Slovenia
| | - Miran Mozetic
- Plasma laboratory; Institute Jozef Stefan; Jamova 39 Ljubljana Slovenia
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136
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Ramasse QM, Zan R, Bangert U, Boukhvalov DW, Son YW, Novoselov KS. Direct experimental evidence of metal-mediated etching of suspended graphene. ACS NANO 2012; 6:4063-4071. [PMID: 22533553 DOI: 10.1021/nn300452y] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Atomic resolution high angle annular dark field imaging of suspended, single-layer graphene, onto which the metals Cr, Ti, Pd, Ni, Al, and Au atoms had been deposited, was carried out in an aberration-corrected scanning transmission electron microscope. In combination with electron energy loss spectroscopy, employed to identify individual impurity atoms, it was shown that nanoscale holes were etched into graphene, initiated at sites where single atoms of all the metal species except for gold come into close contact with the graphene. The e-beam scanning process is instrumental in promoting metal atoms from clusters formed during the original metal deposition process onto the clean graphene surface, where they initiate the hole-forming process. Our observations are discussed in the light of calculations in the literature, predicting a much lowered vacancy formation in graphene when metal ad-atoms are present. The requirement and importance of oxygen atoms in this process, although not predicted by such previous calculations, is also discussed, following our observations of hole formation in pristine graphene in the presence of Si-impurity atoms, supported by new calculations which predict a dramatic decrease of the vacancy formation energy, when SiO(x) molecules are present.
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Affiliation(s)
- Quentin M Ramasse
- SuperSTEM Laboratory, STFC Daresbury Campus , Daresbury WA4 4AD, United Kingdom.
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137
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Kurashige W, Negishi Y. Synthesis, Stability, and Photoluminescence Properties of PdAu10(PPh3)8Cl2 Clusters. J CLUST SCI 2012. [DOI: 10.1007/s10876-011-0437-8] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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138
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Chen Q, Kaneko T, Hatakeyama R. Rapid synthesis of water-soluble gold nanoparticles with control of size and assembly using gas–liquid interfacial discharge plasma. Chem Phys Lett 2012. [DOI: 10.1016/j.cplett.2011.11.065] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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139
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140
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Enderle F, Dubbers O, Plettl A, Ziemann P. Controlled positioning of nanoparticles on a micrometer scale. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2012; 3:773-7. [PMID: 23213640 PMCID: PMC3512126 DOI: 10.3762/bjnano.3.86] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2012] [Accepted: 10/18/2012] [Indexed: 05/07/2023]
Abstract
For many applications it is desirable to have nanoparticles positioned on top of a given substrate well separated from each other and arranged in arrays of a certain geometry. For this purpose, a method is introduced combining the bottom-up self-organization of precursor-loaded micelles providing Au nanoparticles (NPs), with top-down electron-beam lithography. As an example, 13 nm Au NPs are arranged in a square array with interparticle distances >1 µm on top of Si substrates. By using these NPs as masks for a subsequent reactive ion etching, the square pattern is transferred into Si as a corresponding array of nanopillars.
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Affiliation(s)
- Fabian Enderle
- Institute of Solid State Physics, Ulm University, D-89069 Ulm, Germany
| | - Oliver Dubbers
- Institute of Solid State Physics, Ulm University, D-89069 Ulm, Germany
| | - Alfred Plettl
- Institute of Solid State Physics, Ulm University, D-89069 Ulm, Germany
| | - Paul Ziemann
- Institute of Solid State Physics, Ulm University, D-89069 Ulm, Germany
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141
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Kundu P, Singhania N, Madras G, Ravishankar N. ZnO–Au nanohybrids by rapid microwave-assisted synthesis for CO oxidation. Dalton Trans 2012; 41:8762-6. [DOI: 10.1039/c2dt30882g] [Citation(s) in RCA: 26] [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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142
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Hutchings GJ, Edwards JK. Application of Gold Nanoparticles in Catalysis. METAL NANOPARTICLES AND NANOALLOYS 2012. [DOI: 10.1016/b978-0-08-096357-0.00001-7] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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143
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Li J, Liu CY, Liu Y. Au/graphene hydrogel: synthesis, characterization and its use for catalytic reduction of 4-nitrophenol. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm16386a] [Citation(s) in RCA: 753] [Impact Index Per Article: 62.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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144
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López N, Almora-Barrios N, Carchini G, Błoński P, Bellarosa L, García-Muelas R, Novell-Leruth G, García-Mota M. State-of-the-art and challenges in theoretical simulations of heterogeneous catalysis at the microscopic level. Catal Sci Technol 2012. [DOI: 10.1039/c2cy20384g] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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145
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Lu BL, Dai L, Shi M. Strained small rings in gold-catalyzed rapid chemical transformations. Chem Soc Rev 2011; 41:3318-39. [PMID: 22189460 DOI: 10.1039/c2cs15295a] [Citation(s) in RCA: 165] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Gold-catalyzed reactions, which have been widely explored over the past several years, are powerful tools in organic synthesis to access complex molecular frameworks, and some corresponding excellent reviews have been reported. However, little attention has been paid to summarize the reactions of strained small-ring-containing molecules catalyzed by gold. This critical review mainly puts its emphasis on the recent progress in the field of gold-catalyzed transformations of cyclopropyl-, cyclopropenyl-, epoxy- and aziridinyl-containing molecules. The rapid construction of interesting building blocks in organic synthesis from strained small rings catalyzed by gold has been summarized in this review (106 references).
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Affiliation(s)
- Bei-Li Lu
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, China
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146
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147
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Zhang J, Liu X, Hedhili MN, Zhu Y, Han Y. Highly Selective and Complete Conversion of Cellobiose to Gluconic Acid over Au/Cs2HPW12O40Nanocomposite Catalyst. ChemCatChem 2011. [DOI: 10.1002/cctc.201100106] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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148
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Affiliation(s)
- Jinlong Gong
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
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149
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Cattaneo AG, Gornati R, Sabbioni E, Chiriva-Internati M, Cobos E, Jenkins MR, Bernardini G. Nanotechnology and human health: risks and benefits. J Appl Toxicol 2011; 30:730-44. [PMID: 21117037 DOI: 10.1002/jat.1609] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Nanotechnology is expected to be promising in many fields of medical applications, mainly in cancer treatment. While a large number of very attractive exploitations open up for the clinics, regulatory agencies are very careful in admitting new nanomaterials for human use because of their potential toxicity. The very active research on new nanomaterials that are potentially useful in medicine has not been counterbalanced by an adequate knowledge of their pharmacokinetics and toxicity. The different nanocarriers used to transport and release the active molecules to the target tissues should be treated as additives, with potential side effects of themselves or by virtue of their dissolution or aggregation inside the body. Only recently has a systematic classification of nanomaterials been proposed, posing the basis for dedicated modeling at the nanoscale level. The use of in silico methods, such as nano-QSAR and PSAR, while highly desirable to expedite and rationalize the following stages of toxicological research, are not an alternative, but an introduction to mandatory experimental work.
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Affiliation(s)
- Anna Giulia Cattaneo
- Department of Biotechnology and Molecular Sciences, University of Insubria, Varese, Italy
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150
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Sengupta S, Sarma DD, Acharya S. Coalescence of magic sized CdSe into rods and wires and subsequent energy transfer. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm11004g] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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