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Ishijima M, Todoroki N, Cuya Huaman JL, Tanaka Y, Balachandran J. Kinetically Controlled Direct Synthesis of B2- and A1-Structured Cu-Pd Nanoparticles. Inorg Chem 2023; 62:19270-19278. [PMID: 37948849 DOI: 10.1021/acs.inorgchem.3c02766] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2023]
Abstract
Atomic arrangement in Cu-Pd alloy nanoparticles (NPs) has been reported to influence the catalytic activity, but they have yet to be studied in detail. Unlike previous studies, where the B2 structure Cu-Pd NPs are obtained by heat treating the A1 structure, this study reports the one-pot direct syntheses of A1- and B2-structured Cu-Pd NPs using an alcohol reduction method. The alcohol reduction technique facilitates the kinetic control of the reduction reaction by selecting the appropriate alcohol type and complexing agent to delay the reduction of easily reducible metallic elements to realize control over the reduction kinetics for coreduction. Different formation mechanisms for A1- and B2-structured CuPd NPs were confirmed by in situ ultraviolet-visible (UV-vis) measurements and morphological and structural analyses of samples withdrawn during the reaction. Finally, the direct formation of single-phase B2-structured Cu-Pd NPs with an average diameter of 18.6 ± 7.6 nm was realized using tri-n-octyl phosphine as a complexing agent. The noticeable crystal structural dependence of the electrocatalytic CO2 reduction reaction properties of A1- and B2-structured CuPd NPs was demonstrated.
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Affiliation(s)
- Masanao Ishijima
- Department of Applied Chemistry for Environment, Tokyo Metropolitan University, 1-1 Minamiosawa, Hachioji, Tokyo 192-0397, Japan
| | - Naoto Todoroki
- Graduate School of Environmental Studies, Tohoku University, 6-2-2 Aramakiaza-Aoba Aoba-ku, Sendai 980-8579, Japan
| | - Jhon L Cuya Huaman
- Graduate School of Environmental Studies, Tohoku University, 6-2-2 Aramakiaza-Aoba Aoba-ku, Sendai 980-8579, Japan
| | - Yuto Tanaka
- Department of Materials Science, The University of Shiga Prefecture, Hikone, Shiga 522-8533, Japan
| | - Jeyadevan Balachandran
- Graduate School of Environmental Studies, Tohoku University, 6-2-2 Aramakiaza-Aoba Aoba-ku, Sendai 980-8579, Japan
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2
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Dillion Lima Cavalcanti I, Humberto Xavier Junior F, Stela Santos Magalhães N, Cajubá de Britto Lira Nogueira M. ISOTHERMAL TITRATION CALORIMETRY (ITC) AS A PROMISING TOOL IN PHARMACEUTICAL NANOTECHNOLOGY. Int J Pharm 2023; 641:123063. [PMID: 37209790 DOI: 10.1016/j.ijpharm.2023.123063] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Revised: 05/10/2023] [Accepted: 05/13/2023] [Indexed: 05/22/2023]
Abstract
Isothermal titration calorimetry (ITC) is a technique for evaluating the thermodynamic profiles of connection between two molecules, allowing the experimental design of nanoparticles systems with drugs and/or biological molecules. Taking into account the relevance of ITC, we conducted, therefore, an integrative revision of the literature, from 2000 to 2023, on the main purposes of using this technique in pharmaceutical nanotechnology. The search were carried out in the Pubmed, Sciencedirect, Web of Science, and Scifinder databases using the descriptors "Nanoparticles", "Isothermal Titration Calorimetry", and "ITC". We have observed that the ITC technique has been increasingly used in pharmaceutical nanotechnology, seeking to understand the interaction mechanisms in the formation of nanoparticles. Additionally, to understand the behavior of nanoparticles with biological materials (proteins, DNA, cell membranes, among others), thereby helping to understand the behavior of nanocarriers in vivo studies. As a contribution, we intended to reveal the importance of ITC in the laboratory routine, which is itself a quick and easy technique to obtain relevant results that help to optimize the nanosystems formulation process.
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Affiliation(s)
- Iago Dillion Lima Cavalcanti
- Keizo Asami Institute (iLIKA), Federal University of Pernambuco (UFPE), Av. Prof. Moraes Rego - Cidade Universitária, Recife - PE, Brazil
| | - Francisco Humberto Xavier Junior
- Keizo Asami Institute (iLIKA), Federal University of Pernambuco (UFPE), Av. Prof. Moraes Rego - Cidade Universitária, Recife - PE, Brazil; Department of Pharmacy, Pharmaceutical Biotechnology Laboratory (BioTecFarm), Federal University of Paraíba (UFPB), Campus I Lot. Cidade Universitaria, PB, 58051-900, Brazil
| | - Nereide Stela Santos Magalhães
- Keizo Asami Institute (iLIKA), Federal University of Pernambuco (UFPE), Av. Prof. Moraes Rego - Cidade Universitária, Recife - PE, Brazil
| | - Mariane Cajubá de Britto Lira Nogueira
- Keizo Asami Institute (iLIKA), Federal University of Pernambuco (UFPE), Av. Prof. Moraes Rego - Cidade Universitária, Recife - PE, Brazil; Laboratory of Nanotechnology, Biotechnology and Cell Culture (NanoBioCel), Academic Center of Vitória, Federal University of Pernambuco (CAV/UFPE), R. Alto do Reservatório - Alto José Leal, Vitória de Santo Antão - PE, 55608-680, Brazil.
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3
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Eckert T, Schmidt M, de Las Heras D. Sedimentation path theory for mass-polydisperse colloidal systems. J Chem Phys 2022; 157:234901. [PMID: 36550036 DOI: 10.1063/5.0129916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Both polydispersity and the presence of a gravitational field are inherent to essentially any colloidal experiment. While several theoretical works have focused on the effect of polydispersity on the bulk phase behavior of a colloidal system, little is known about the effect of a gravitational field on a polydisperse colloidal suspension. We extend here the sedimentation path theory to study sedimentation-diffusion-equilibrium of a mass-polydisperse colloidal system: the particles possess different buoyant masses but they are otherwise identical. The model helps to understand the interplay between gravity and polydispersity on sedimentation experiments. Since the theory can be applied to any parent distribution of buoyant masses, it can also be used to study the sedimentation of monodisperse colloidal systems. We find that mass-polydispersity has a strong influence in colloidal systems near density matching for which the bare density of the colloidal particles equals the solvent density. To illustrate the theory, we study crystallization in sedimentation-diffusion-equilibrium of a suspension of mass-polydisperse hard spheres.
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Affiliation(s)
- Tobias Eckert
- Theoretische Physik II, Physikalisches Institut, Universität Bayreuth, D-95440 Bayreuth, Germany
| | - Matthias Schmidt
- Theoretische Physik II, Physikalisches Institut, Universität Bayreuth, D-95440 Bayreuth, Germany
| | - Daniel de Las Heras
- Theoretische Physik II, Physikalisches Institut, Universität Bayreuth, D-95440 Bayreuth, Germany
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Enhancing the electrocatalytic activity of palladium nanocluster tags by selective introduction of gold atoms: Application for a wound infection biomarker detection. Biosens Bioelectron 2022; 200:113926. [PMID: 34990956 DOI: 10.1016/j.bios.2021.113926] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Revised: 12/11/2021] [Accepted: 12/25/2021] [Indexed: 11/23/2022]
Abstract
In this work, an unprecedented study exploring the role that slight changes into the Pd/Au proportion have in the electrocatalytic activity of bimetallic Pd-AuNPs toward the oxygen reduction reaction (ORR) is conducted. In particular, a careful control of the amount of Au atoms introduced in the cluster and the evaluation of the optimum Pd:Au ratio for getting the maximum catalytic activity is performed for the first time. First, PdNPs are synthesized by alcohol reduction in the presence of polyvinylpyrrolidone, and gold atoms are selectively introduced on vertex or corner positions of the cluster in different amounts following a galvanic substitution procedure. Average elemental analysis done relying on EDX spectroscopy allows to evaluate the Pd:Au ratio in the Pd-AuNPs obtained. Lineal sweep voltammetry and chronoamperometry are used for the evaluation of the Pd-AuNPs electrocatalytic activity toward ORR at a neutral pH compared to PdNPs and AuNPs alone. Our results indicate that, the synergy between both metals is strongly enhanced when the amount of gold is controlled and occupies the more reactive positions of the cluster, reaching a maximum activity for the NPs containing a 30% of gold, while an excess of this metal leads to a decrease in such activity, as a shelter of the PdNPs is achieved. Chronoamperometric analysis allows the quantification of the optimal Pd-AuNPs at over 6 × 109 NPs/mL levels. Such optimal Pd-AuNPs were used as tags, taking advantage of the bio-functionalities of gold present in the cluster, in a proof-of-concept electrochemical immunosensor for the detection of hyaluronidase wound infection biomarker, using magnetic beads as platforms. Hyaluronidase was detected at levels as low as 50 ng/mL (0.02 U/mL; 437 U/mg) with good reproducibility (RSD below 8%) and selectivity (evaluated against bovine serum albumin, immunoglobulin G and lysozyme). The low matrix effects inherent to the use of magnetic bead platforms allowed us to discriminate between wound exudates with both sterile and infected ulcers without sample pre-treatment. This novel electrocatalytic immunoassay has the advantage, over common methods for NP tags electrochemical detection, of the signal generation in the same neutral medium where the immunoassay takes place (10 mM PBS pH 7.4), avoiding the use of additional and hazardous reagents, bringing it closer to their use as point-of-care devices. Overall, our findings may be of great interest not only for biosensing, but also for applications such as energy converting on fuel cells, in which the ORR has a pivotal role.
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Ishijima M, Matsumoto T, Cuya Huaman JL, Shinoda K, Uchikoshi M, Matsuo K, Suzuki K, Miyamura H, Balachandran J. Theoretical and Experimental Evaluation of the Reduction Potential of Straight-Chain Alcohols for the Designed Synthesis of Bimetallic Nanostructures. Inorg Chem 2021; 60:9432-9441. [PMID: 33847487 DOI: 10.1021/acs.inorgchem.1c00476] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Recently, the development of bimetallic nanoparticles with functional properties has been attempted extensively but with limited control over their morphological and structural properties. The reason was the inability to control the kinetics of the reduction reaction in most liquid-phase syntheses. However, the alcohol reduction technique has demonstrated the possibility of controlling the reduction reaction and facilitating the incorporation of other phenomena such as diffusion, etching, and galvanic replacement during nanostructure synthesis. In this study, the reduction potential of straight-chain alcohols has been investigated using molecular orbital calculations and experimentally verified by reducing transition metals. The alcohols with a longer chain exhibited higher reduction potential, and 1-octanol was found to be the strongest among alcohols considered. Furthermore, the experimental evaluation carried out via the synthesis of metallic Cu, Ni, and Co particles was consistent with the theoretical predictions. The reaction mechanism of metallic particle formation was also studied in detail in the Ni-1-octanol system, and the metal ions were confirmed to be reduced via the formation of nickel alkoxide. The results of this investigation were successfully implemented to synthesize Cu-Ni bimetallic nanostructures (core-shell, wire, and tube) via the incorporation of diffusion and etching besides the reduction reaction. These results suggest that the designed synthesis of a wide range of bimetallic nanostructures with more refined control has become possible.
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Affiliation(s)
- Masanao Ishijima
- Department of Materials Science, The University of Shiga Prefecture, Hikone, Shiga 522-8533, Japan
| | - Takatoshi Matsumoto
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
| | - Jhon L Cuya Huaman
- Department of Materials Science, The University of Shiga Prefecture, Hikone, Shiga 522-8533, Japan
| | - Kozo Shinoda
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
| | - Masahito Uchikoshi
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
| | - Kohei Matsuo
- Department of Materials Science, The University of Shiga Prefecture, Hikone, Shiga 522-8533, Japan
| | - Kazumasa Suzuki
- Department of Materials Science, The University of Shiga Prefecture, Hikone, Shiga 522-8533, Japan
| | - Hiroshi Miyamura
- Department of Materials Science, The University of Shiga Prefecture, Hikone, Shiga 522-8533, Japan
| | - Jeyadevan Balachandran
- Department of Materials Science, The University of Shiga Prefecture, Hikone, Shiga 522-8533, Japan
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6
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Breisch M, Loza K, Pappert K, Rostek A, Rurainsky C, Tschulik K, Heggen M, Epple M, Tiller JC, Schildhauer TA, Köller M, Sengstock C. Enhanced dissolution of silver nanoparticles in a physical mixture with platinum nanoparticles based on the sacrificial anode effect. NANOTECHNOLOGY 2020; 31:055703. [PMID: 31618711 DOI: 10.1088/1361-6528/ab4e48] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
A strategy to reduce implant-related infections is the inhibition of the initial bacterial implant colonization by biomaterials containing silver (Ag). The antimicrobial efficacy of such biomaterials can be increased by surface enhancement (nanosilver) or by creating a sacrificial anode system for Ag. Such a system will lead to an electrochemically driven enhanced Ag ion release due to the presence of a more noble metal. Here we combined the enlarged surface of nanoparticles (NP) with a possible sacrificial anode effect for Ag induced by the presence of the electrochemically more noble platinum (Pt) in physical mixtures of Ag NP and Pt NP dispersions. These Ag NP/Pt NP mixtures were compared to the same amounts of pure Ag NP in terms of cell biological responses, i.e. the antimicrobial activity against Staphylococcus aureus and Escherichia coli as well as the viability of human mesenchymal stem cells (hMSC). In addition, Ag NP was analyzed by ultraviolet-visible (UV-vis) spectroscopy, cyclic voltammetry, and atomic absorption spectroscopy. It was found that the dissolution rate of Ag NP was enhanced in the presence of Pt NP within the physical mixture compared to a dispersion of pure Ag NP. Dissolution experiments revealed a fourfold increased Ag ion release from physical mixtures due to enhanced electrochemical activity, which resulted in a significantly increased toxicity towards both bacteria and hMSC. Thus, our results provide evidence for an underlying sacrificial anode mechanism induced by the presence of Pt NP within physical mixtures with Ag NP. Such physical mixtures have a high potential for various applications, for example as antimicrobial implant coatings in the biomedicine or as bactericidal systems for water and surface purification in the technical area.
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Affiliation(s)
- Marina Breisch
- BG University Hospital Bergmannsheil Bochum/Surgical Research, Ruhr University Bochum, Buerkle-de-la-Camp-Platz 1, D-44789 Bochum, Germany
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7
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Template free synthesis of calcium-tin (CaSn3) bimetallic micro cubes: Characterization, catalytic activity, adsorption and additive properties. Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2019.136917] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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8
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Li N, Chen W, Shen J, Chen S, Liu X. Synthesis of graphene quantum dots stabilized bimetallic AgRh nanoparticles and their applications. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2019.119031] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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9
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Hirakawa K, Kaneko T, Toshima N. Kinetics of Spontaneous Bimetallization between Silver and Noble Metal Nanoparticles. Chem Asian J 2018; 13:1892-1896. [PMID: 29870120 DOI: 10.1002/asia.201800633] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Revised: 05/28/2018] [Indexed: 01/23/2023]
Abstract
A physical mixture of polymer-protected Ag nanoparticles and Rh, Pd, or Pt nanoparticles spontaneously forms Ag-core bimetallic nanoparticles. The formed nanoparticles were smaller than the parent Ag nanoparticles. In the initial process of this reaction, the surface plasmon absorption of Ag nanoparticles diminished and then almost ceased within one hour. Within several minutes, the decrease in Ag surface plasmon absorption could be analyzed by second-order reaction. This reaction was accelerated with an increase of temperature and the energy gap in the Fermi level between Ag and the other metals. The activation energy (Ea ) of this reaction could be determined. An electron transfer reaction from Ag to other metal nanoparticles was proposed as the initial interaction between these metal nanoparticles because the Fermi level of Ag is relatively high, and the electron transfer is possible in terms of energy. The Marcus plot between the rate constant and the driving force, roughly estimated from the work function of metals, and the observed Ea values reasonably explained the proposed electron transfer mechanism.
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Affiliation(s)
- Kazutaka Hirakawa
- Department of Applied Chemistry and Biochemical Engineering, Shizuoka University, Johoku 3-5-1, Naka-ku, Hamamatsu, Shizuoka, 432-8561, Japan
| | - Tetsuya Kaneko
- Department of Applied Chemistry and Biochemical Engineering, Shizuoka University, Johoku 3-5-1, Naka-ku, Hamamatsu, Shizuoka, 432-8561, Japan
| | - Naoki Toshima
- Division of Thermoelectrics for Waste Heat Recovery, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo, 125-8585, Japan
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10
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Highly efficient silica coated CuNi bimetallic nanocatalyst from reverse microemulsion. J Colloid Interface Sci 2017; 491:123-132. [DOI: 10.1016/j.jcis.2016.12.043] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Revised: 11/03/2016] [Accepted: 12/17/2016] [Indexed: 11/19/2022]
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11
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Zhang B, Yuan Y, Philippot K, Yan N. Ag–Pd and CuO–Pd nanoparticles in a hydroxyl-group functionalized ionic liquid: synthesis, characterization and catalytic performance. Catal Sci Technol 2015. [DOI: 10.1039/c4cy01382d] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Heteronuclear Ag–Pd and CuO–Pd nanoparticles with a controllable Ag : Pd or Cu : Pd ratio were easily synthesized through thermal decomposition of their acetate salts in a functionalized ionic liquid, [C2OHmim][NTf2].
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Affiliation(s)
- Bin Zhang
- Department of Chemical and Biomolecular Engineering
- National University of Singapore
- Singapore
| | - Yuan Yuan
- Department of Chemical and Biomolecular Engineering
- National University of Singapore
- Singapore
| | - Karine Philippot
- Laboratoire de Chimie de Coordination
- CNRS
- F-31077 Toulouse Cedex 4
- France
- Université de Toulouse
| | - Ning Yan
- Department of Chemical and Biomolecular Engineering
- National University of Singapore
- Singapore
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12
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Au–Pd alloy nanoparticle catalyzed selective oxidation of benzyl alcohol and tandem synthesis of imines at ambient conditions. Catal Today 2014. [DOI: 10.1016/j.cattod.2014.04.015] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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13
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Mondal S, Ghosh D, Roy CN, Saha A. Determination of the energetics of formation of semiconductor/dendrimer nanohybrid materials: implications on the size and size distribution of nanocrystals. RSC Adv 2014. [DOI: 10.1039/c3ra47960a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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14
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Adlim M, Bakar MA. The properties of Pd/Au bimetallic colloidal catalysts stabilized by chitosan and prepared by simultaneous and stepwise chemical reduction of the precursor ions. KINETICS AND CATALYSIS 2013. [DOI: 10.1134/s0023158413050017] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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15
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Xu B. Adsorption Behavior of Metal Cations on Gold Nanoparticle Surfaces Studied by Isothermal Titration Microcalorimetry. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.201000046] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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16
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Zhang H, Haba M, Okumura M, Akita T, Hashimoto S, Toshima N. Novel formation of Ag/Au bimetallic nanoparticles by physical mixture of monometallic nanoparticles in dispersions and their application to catalysts for aerobic glucose oxidation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:10330-10339. [PMID: 23829515 DOI: 10.1021/la401878g] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Ag/Au bimetallic nanoparticles (BNPs) with a size less than 2 nm were prepared by physical mixture of colloidal dispersions of Ag and Au nanoparticles (NPs). This provides an example of fabrication of BNPs with self-organization by the reaction between metal NPs. Although Ag/Au BNPs having different structures and compositions are one of the most widely studied bimetallic systems in the literature due to their wide range of uses such as in catalysis, electronics, plasmonics, optical sensing, and surface-enhanced Raman scattering, we first prepared such BNPs by physical mixture and characterized them by UV-vis spectroscopy, SERS, XPS, TEM, and EDS in HR-STEM. The present fabrication method has the advantage of avoiding the unfavorable formation of AgCl precipitates in the reaction process which are always produced when Ag(+) ions are used as a starting material in combination with a HAuCl4 precursor. These Ag/Au BNPs showed high catalytic activities for aerobic glucose oxidation, and the highest activity of 11,510 mol of glucose·h(-1)·mol of metal(-1) was observed for the BNPs with a Ag/Au atomic ratio of 1/4; the activity value is about 2 times higher than that of Au NPs with nearly the same particle size. XPS and DFT calculation results show that the negatively charged Au atoms due to the electron charge transfer effects from neighboring Ag atoms and poly(N-vinyl-2-pyrrolidone) act as catalytically active sites and play an important role in the aerobic glucose oxidation.
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Affiliation(s)
- Haijun Zhang
- College of Materials & Metallurgy, Wuhan University of Science and Technology, Wuhan, Hubei Province 430081, China
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17
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Liu CH, Chen XQ, Hu YF, Sham TK, Sun QJ, Chang JB, Gao X, Sun XH, Wang SD. One-pot environmentally friendly approach toward highly catalytically active bimetal-nanoparticle-graphene hybrids. ACS APPLIED MATERIALS & INTERFACES 2013; 5:5072-9. [PMID: 23668945 DOI: 10.1021/am4008853] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
A one-pot universal approach with simple metal sputtering onto room temperature ionic liquids has been developed to prepare bimetal-nanoparticle (NP)-graphene hybrids, and the process is environmentally friendly and completely free of additives and byproducts. The graphene-supported bimetallic NPs have an Ag-based core and an Au/Pd-rich shell, demonstrated by the scanning transmission electron microscopy. The X-ray absorption near-edge spectroscopy using synchrotron radiation reveals the occurrence of charge redistribution at both the Ag@Au and Ag@Pd core-shell interfaces. The as-prepared Ag@Au and Ag@Pd bimetal-NP-graphene hybrids are highly catalytically active for reduction of 4-nitrophenol, whose catalytic activity is superior to the corresponding monometallic hybrids. The catalytic superiority is ascribed to the electronic structure modification and morphological irregularity of the graphene-supported bimetallic NPs.
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Affiliation(s)
- Chang-Hai Liu
- Soochow University-Western University Joint Centre for Synchrotron Radiation Research, Soochow University, Suzhou, Jiangsu 215123, P R China
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18
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Sarina S, Zhu H, Jaatinen E, Xiao Q, Liu H, Jia J, Chen C, Zhao J. Enhancing Catalytic Performance of Palladium in Gold and Palladium Alloy Nanoparticles for Organic Synthesis Reactions through Visible Light Irradiation at Ambient Temperatures. J Am Chem Soc 2013; 135:5793-801. [DOI: 10.1021/ja400527a] [Citation(s) in RCA: 373] [Impact Index Per Article: 33.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Sarina Sarina
- School of Chemistry,
Physics and Mechanical Engineering, Queensland University of Technology, Brisbane QLD4001, Australia
| | - Huaiyong Zhu
- School of Chemistry,
Physics and Mechanical Engineering, Queensland University of Technology, Brisbane QLD4001, Australia
| | - Esa Jaatinen
- School of Chemistry,
Physics and Mechanical Engineering, Queensland University of Technology, Brisbane QLD4001, Australia
| | - Qi Xiao
- School of Chemistry,
Physics and Mechanical Engineering, Queensland University of Technology, Brisbane QLD4001, Australia
| | - Hongwei Liu
- School of Chemistry,
Physics and Mechanical Engineering, Queensland University of Technology, Brisbane QLD4001, Australia
| | - Jianfeng Jia
- School of Chemical
and Material Science, Shanxi Normal University, Linfen 041004, China
| | - Chao Chen
- School of Chemistry,
Physics and Mechanical Engineering, Queensland University of Technology, Brisbane QLD4001, Australia
| | - Jian Zhao
- School of Chemistry,
Physics and Mechanical Engineering, Queensland University of Technology, Brisbane QLD4001, Australia
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19
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Chen Y, Wang Q, Wang T. Fabrication of thermally stable and active bimetallic Au–Ag nanoparticles stabilized on inner wall of mesoporous silica shell. Dalton Trans 2013; 42:13940-7. [PMID: 23925801 DOI: 10.1039/c3dt51546j] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Yu Chen
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Science, Lanzhou 730000, China.
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20
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Koga Y. 1-Propanol probing methodology: two-dimensional characterization of the effect of solute on H2O. Phys Chem Chem Phys 2013; 15:14548-65. [DOI: 10.1039/c3cp51650d] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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21
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Zhang H, Toshima N. Glucoseoxidation using Au-containing bimetallic and trimetallic nanoparticles. Catal Sci Technol 2013. [DOI: 10.1039/c2cy20345f] [Citation(s) in RCA: 112] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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22
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Ghosh D, Mondal S, Roy CN, Saha A. Evolution of biofunctional semiconductor nanocrystals: a calorimetric investigation. Phys Chem Chem Phys 2013; 15:20354-62. [DOI: 10.1039/c3cp52158c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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23
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Abkhalimov EV, Solovov RD, Ershov BG, Kozitsyna NY, Yakushev IA, Vargaftik MN. PdAg2 nanoparticles in aqueous solution: Preparation, characterization, and catalytic properties. COLLOID JOURNAL 2012. [DOI: 10.1134/s1061933x12040023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Bhandari R, Coppage R, Knecht MR. Mimicking nature's strategies for the design of nanocatalysts. Catal Sci Technol 2012. [DOI: 10.1039/c1cy00350j] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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25
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Zhang H, Watanabe T, Okumura M, Haruta M, Toshima N. Catalytically highly active top gold atom on palladium nanocluster. NATURE MATERIALS 2011; 11:49-52. [PMID: 22019941 DOI: 10.1038/nmat3143] [Citation(s) in RCA: 369] [Impact Index Per Article: 28.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2011] [Accepted: 09/08/2011] [Indexed: 05/24/2023]
Abstract
Catalysis using gold is emerging as an important field of research in connection with 'green' chemistry. Several hypotheses have been presented to explain the markedly high activities of Au catalysts. So far, the origin of the catalytic activities of supported Au catalysts can be assigned to the perimeter interfaces between Au nanoclusters and the support. However, the genesis of the catalytic activities of colloidal Au-based bimetallic nanoclusters is unclear. Moreover, it is still a challenge to synthesize Au-based colloidal catalysts with high activity. Here we now present the 'crown-jewel' concept (Supplementary Fig. S1) for preparation of catalytically highly Au-based colloidal catalysts. Au-Pd colloidal catalysts containing an abundance of top (vertex or corner) Au atoms were synthesized according to the strategy on a large scale. Our results indicate that the genesis of the high activity of the catalysts could be ascribed to the presence of negatively charged top Au atoms.
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Ershov BG, Abkhalimov EV, Anan’ev AV. Mixed bimetallic palladium-silver nanoparticles in aqueous solution. DOKLADY PHYSICAL CHEMISTRY 2011. [DOI: 10.1134/s0012501611080021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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27
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Miyabayashi K, Higashimoto M, Shen Z, Miyake M. Site Specific Deposition of Ag on the Corners of Pt Nanocubes. CHEM LETT 2011. [DOI: 10.1246/cl.2011.705] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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28
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Jiang HL, Akita T, Ishida T, Haruta M, Xu Q. Synergistic Catalysis of Au@Ag Core−Shell Nanoparticles Stabilized on Metal−Organic Framework. J Am Chem Soc 2011; 133:1304-6. [DOI: 10.1021/ja1099006] [Citation(s) in RCA: 791] [Impact Index Per Article: 60.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hai-Long Jiang
- National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka 563-8577, Japan
- CREST, Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012, Japan
| | - Tomoki Akita
- National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka 563-8577, Japan
- CREST, Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012, Japan
| | - Tamao Ishida
- Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
- CREST, Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012, Japan
| | - Masatake Haruta
- Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
- CREST, Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012, Japan
| | - Qiang Xu
- National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka 563-8577, Japan
- CREST, Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012, Japan
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Zhang H, Okuni J, Toshima N. One-pot synthesis of Ag-Au bimetallic nanoparticles with Au shell and their high catalytic activity for aerobic glucose oxidation. J Colloid Interface Sci 2010; 354:131-8. [PMID: 21067768 DOI: 10.1016/j.jcis.2010.10.036] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2010] [Revised: 10/14/2010] [Accepted: 10/15/2010] [Indexed: 10/18/2022]
Abstract
PVP-protected Ag(core)/Au(shell) bimetallic nanoparticles of enough small size, i.e., 1.4nm in diameter were synthesized in one-vessel using simultaneous reduction of the corresponding ions with rapid injection of NaBH(4), and characterized by HR-TEM. The Ag(core)/Au(shell) bimetallic nanoparticles show a high and durable catalytic activity for the aerobic glucose oxidation, and the catalyst can be stably kept for more than 2months under ambient conditions. The highest activity (16,890mol-glucoseh(-1)mol-metal(-1)) was observed for the bimetallic nanoparticles with Ag/Au atomic ratio of 2/8, the TOF value of which is several times higher than that of Au nanoparticles with nearly the same particle size. The higher catalytic activity of the prepared bimetallic nanoparticles than the usual Au nanoparticles can be ascribed to: (1) the small average diameter, usually less than 2.0nm, and (2) the electronic charge transfer effect from adjacent Ag atoms and protecting PVP to Au active sites. In contrast, the Ag-Au alloy nanoparticles, synthesized by dropwise addition of NaBH(4) into the starting solution and having the large mean particle size, showed a low catalytic activity.
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Affiliation(s)
- Haijun Zhang
- Department of Applied Chemistry, Tokyo University of Science Yamaguchi, SanyoOnoda-shi, Yamaguchi 756-0884, Japan
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30
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Zhong CJ, Luo J, Fang B, Wanjala BN, Njoki PN, Loukrakpam R, Yin J. Nanostructured catalysts in fuel cells. NANOTECHNOLOGY 2010; 21:062001. [PMID: 20065536 DOI: 10.1088/0957-4484/21/6/062001] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
One of the most important challenges for the ultimate commercialization of fuel cells is the preparation of active, robust, and low-cost catalysts. This review highlights some findings of our investigations in the last few years in developing advanced approaches to nanostructured catalysts that address this challenge. Emphasis is placed on nanoengineering-based fabrication, processing, and characterization of multimetallic nanoparticles with controllable size (1-10 nm), shape, composition (e.g. Ml(n)M2(100-n), M1(n)M2(m)M3(100-n-m), M1@M2, where M (1 or 2) = Pt, Co, Ni, V, Fe, Cu, Pd, W, Ag, Au etc) and morphology (e.g. alloy, core@shell etc). In addition to an overview of the fundamental issues and the recent progress in fuel cell catalysts, results from evaluations of the electrocatalytic performance of nanoengineered catalysts in fuel cell reactions are discussed. This approach differs from other traditional approaches to the preparation of supported catalysts in the ability to control the particle size, composition, phase, and surface properties. An understanding of how the nanoscale properties of the multimetallic nanoparticles differ from their bulk-scale counterparts, and how the interaction between the nanoparticles and the support materials relates to the size sintering or evolution in the thermal activation process, is also discussed. The fact that the bimetallic gold-platinum nanoparticle system displays a single-phase character different from the miscibility gap known for its bulk-scale counterpart serves as an important indication of the nanoscale manipulation of the structural properties, which is useful for refining the design and preparation of the bimetallic catalysts. The insight gained from probing how nanoparticle-nanoparticle and nanoparticle-substrate interactions relate to the size evolution in the activation process of nanoparticles on planar substrates serves as an important guiding principle in the control of nanoparticle sintering on different support materials. The fact that some of the trimetallic nanoparticle catalysts (e.g. PtVFe or PtNiFe) exhibit electrocatalytic activities in fuel cell reactions which are four-five times higher than in pure Pt catalysts constitutes the basis for further exploration of a variety of multimetallic combinations. The fundamental insights into the control of nanoscale alloy, composition, and core-shell structures have important implications in identifying nanostructured fuel cell catalysts with an optimized balance of catalytic activity and stability.
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Affiliation(s)
- Chuan-Jian Zhong
- Department of Chemistry, State University of New York at Binghamton, Binghamton, NY 13902, USA.
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31
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Hirakawa K, Sano S. Platinum Nanoparticle Catalyst Scavenges Hydrogen Peroxide Generated from Hydroquinone. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2009. [DOI: 10.1246/bcsj.82.1299] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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32
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Appelhans D, Komber H, Quadir MA, Richter S, Schwarz S, van der Vlist J, Aigner A, Müller M, Loos K, Seidel J, Arndt KF, Haag R, Voit B. Hyperbranched PEI with various oligosaccharide architectures: synthesis, characterization, ATP complexation, and cellular uptake properties. Biomacromolecules 2009; 10:1114-24. [PMID: 19338349 DOI: 10.1021/bm801310d] [Citation(s) in RCA: 103] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We present a rapid synthetic method for the development of hyperbranched PEIs decorated with different oligosaccharide architectures as carrier systems (CS) for drugs and bioactive molecules for in vitro and in vivo experiments. Reductive amination of hyperbranched PEI with readily available oligosaccharides results in sugar functionalized PEI cores with oligosaccharide shells of different densities. These core-shell architectures were characterized by NMR spectroscopy, elemental analysis, SLS, DLS, IR, and polyelectrolyte titration experiments. ATP complexation of theses polycations was examined by isothermal titration calorimetry to evaluate the binding energy and ATP/CS complexation ratios under physiological conditions. In vitro experiments showed an enhanced cellular uptake of ATP/CS complexes compared to those of the free ATP molecules. The results arise to initiate further noncovalent complexation studies of pharmacologically relevant molecules that may lead to the development of therapeutics based on this polymeric delivery platform.
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Affiliation(s)
- Dietmar Appelhans
- Leibniz Institute of Polymer Research Dresden, Hohe Strasse 6, D-01069 Dresden, Germany.
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33
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Synthesis and Characterization of Silver–Platinum Bimetallic Nanowires and Platinum Nanotubes. J CLUST SCI 2009. [DOI: 10.1007/s10876-009-0242-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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34
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Evteev AV, Levchenko EV, Belova IV, Murch GE. Interdiffusion and surface-sandwich ordering in initial Ni-core–Pd-shell nanoparticle. Phys Chem Chem Phys 2009; 11:3233-40. [DOI: 10.1039/b822112j] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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35
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Polymer-Assisted Composites of Trimetallic Nanoparticles with a Three-Layered Core-Shell Structure for Catalyses. ACTA ACUST UNITED AC 2009. [DOI: 10.1007/978-3-540-92233-9_3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
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36
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Toshima N. Capped Bimetallic and Trimetallic Nanoparticles for Catalysis and Information Technology. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/masy.200851004] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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37
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Quadir MA, Radowski MR, Kratz F, Licha K, Hauff P, Haag R. Dendritic multishell architectures for drug and dye transport. J Control Release 2008; 132:289-94. [PMID: 18639596 DOI: 10.1016/j.jconrel.2008.06.016] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2008] [Revised: 06/13/2008] [Accepted: 06/16/2008] [Indexed: 12/21/2022]
Abstract
Here we present the efficiency and versatility of newly developed core-multishell nanoparticles (CMS NPs), to encapsulate and transport the antitumor drugs doxorubicin hydrochloride (Dox), methotrexate (Mtx) and sodium ibandronate (Ibn) as well as dye molecules, i.e., a tetrasulfonated indotricarbocyanine (ITCC) and nile red. Structurally, the CMS NPs are composed of hyperbranched poly(ethylene imine) core functionalized by alkyl diacids connected to monomethyl poly(ethylene glycol). In order to evaluate their transport in aqueous media in vitro, we have used and compared SEC, UV, ITC, and NMR techniques. We observed that the CMS NPs were able to spontaneously encapsulate and transport Dox, Mtx and nile red in both organic and aqueous media as determined by SEC and UV-VIS spectroscopy. For the VIS transparent Ibn Isothermal Titration Calorimetric (ITC) experiments show an exothermic interaction with the CMS NPs. The enthalpic stabilization (DeltaH) upon encapsulation was in the order of approximately 7 kcals/mol which indicates stable interaction between Ibn and nanoparticles. A T(1) inversion recovery NMR experiment was carried out for 31P and 1H nuclei of Ibn and an increment of spin-lattice relaxation time for respective nuclei was observed upon encapsulation. CMS NPs were also found to encapsulate ITCC dye with stoichiometry of 6-8 molecules/nanocarrier. For in vivo imaging studies the dye loaded CMS NPs were injected to F9 teratocarcinoma bearing mice and a strong contrast was observed in the tumor tissues compared to free dye after 6 h of administration.
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Affiliation(s)
- Mohiuddin A Quadir
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustrasse 3, 14195 Berlin, Germany
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38
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Wang L, Park HY, Lim SII, Schadt MJ, Mott D, Luo J, Wang X, Zhong CJ. Core@shell nanomaterials: gold-coated magnetic oxide nanoparticles. ACTA ACUST UNITED AC 2008. [DOI: 10.1039/b719096d] [Citation(s) in RCA: 170] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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39
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Calvo F. Solid-solution precursor to melting in onion-ring Pd–Pt nanoclusters: a case of second-order-like phase change? Faraday Discuss 2008; 138:75-88; discussion 119-35, 433-4. [DOI: 10.1039/b702732j] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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40
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Yan H, Kawamitsu H, Kushi Y, Kuwajima T, Ishii K, Toshima N. Calorimetric study on interaction of water-soluble copolymers with ionic surfactant. J Colloid Interface Sci 2007; 315:94-8. [PMID: 17692866 DOI: 10.1016/j.jcis.2007.06.061] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2007] [Revised: 06/14/2007] [Accepted: 06/25/2007] [Indexed: 11/21/2022]
Abstract
Using isothermal titration microcalorimetry (ITC), we examined the aggregation behavior of water-soluble copolymers, poly(methoxypolyethylene glycol methacrylate-co-ethyl acrylate)s (PME-EA)s, with ionic surfactant, sodium dodecyl sulfate (SDS). From ITC measurements the values of critical aggregation concentration (cac) and saturation concentration (C(2)), the concentration at which the aggregation of the copolymers starts to form and reaches saturation, respectively, were determined. Thermodynamic parameters such as DeltaG(0)(agg), DeltaH(agg), and TDeltaS(0)(agg) of the aggregation were deduced. Results indicate that cac of the PME-EA remained constant with increase in the concentration of the copolymers, while C(2) increased linearly. On the other hand, the effect of the weight ratio of the EA unit in the copolymer was such that cac of the PME400-EA decreased, while C(2) increased with increase in the weight ratio. The results suggested that the EA units are the main binding sites of the copolymer with SDS.
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Affiliation(s)
- Hu Yan
- Department of Materials Science and Environmental Engineering, Tokyo University of Science, Yamaguchi, SanyoOnoda-shi, Yamaguchi 756-0884, Japan.
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Matsushita T, Shiraishi Y, Horiuchi S, Toshima N. Synthesis and Catalysis of Polymer-Protected Pd/Ag/Rh Trimetallic Nanoparticles with a Core–Shell Structure. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2007. [DOI: 10.1246/bcsj.80.1217] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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42
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Park IS, Lee KS, Jung DS, Park HY, Sung YE. Electrocatalytic activity of carbon-supported Pt–Au nanoparticles for methanol electro-oxidation. Electrochim Acta 2007. [DOI: 10.1016/j.electacta.2006.12.068] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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43
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Toshima N, Ito R, Matsushita T, Shiraishi Y. Trimetallic nanoparticles having a Au-core structure. Catal Today 2007. [DOI: 10.1016/j.cattod.2007.03.013] [Citation(s) in RCA: 90] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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44
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Cheng D, Wang W, Huang S. The Onion-Ring Structure for Pd−Pt Bimetallic Clusters. J Phys Chem B 2006; 110:16193-6. [PMID: 16913740 DOI: 10.1021/jp063721e] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The onion-ring structure is validated in the Pd-Pt bimetallic clusters of total atom numbers 147 and 309 through the Monte Carlo method by using the second-moment approximation of the tight-binding (TB-SMA) potentials, which is conceived in predicting the possible structures of the bimetallic clusters by He et al. [J. Am. Chem. Soc. 2003, 125, 11034] and Hwang et al. [J. Am. Chem. Soc. 2005, 127, 11140]. In the onion-ring structure, Pd atoms and Pt atoms occupy alternate layers of the clusters. The formation of the onion-ring structure can be associated with the fact that the single Pt impurity is favorable to stay in the subsurface layer and the central part of bimetallic clusters.
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