1
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Fioravante da Silveira L, Zago A, Zanchet D, Chemello D. Macrophage activation syndrome in a patient with systemic lupus erythematosus undergoing cyclophosphamide treatment: a case report. Reumatismo 2023; 75. [PMID: 37462126 DOI: 10.4081/reumatismo.2023.1597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2023] [Accepted: 06/30/2023] [Indexed: 07/20/2023] Open
Abstract
Macrophage activation syndrome (MAS) is a disorder related to hemophagocytic lymphohistiocytosis and is a life-threatening complication of rheumatic diseases. The diagnosis is challenging because MAS symptoms are quite similar to those of many active autoimmune diseases or severe sepsis. We describe the case of a female patient with systemic lupus erythematosus that presented with symptoms suggesting acute decompensation of autoimmune disease and sepsis. She was later diagnosed with MAS. Despite an aggressive immunosuppressive treatment, she developed a fatal outcome.
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Affiliation(s)
| | - A Zago
- Health Science Center, Department of Clinical Medicine, Federal University of Santa Maria.
| | - D Zanchet
- Health Science Center, Department of Clinical Medicine, Federal University of Santa Maria.
| | - D Chemello
- Health Science Center, Department of Clinical Medicine, Federal University of Santa Maria; Department of Health Sciences, Federal University of Santa Maria .
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2
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Leite DS, Strapasson GB, Zanchet D. Unveiling the effect of metallic and oxidized phases of cobalt on acetone hydrodeoxygenation. Molecular Catalysis 2022. [DOI: 10.1016/j.mcat.2022.112623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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3
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Fiuza TER, Gonçalves DS, Gomes IF, Zanchet D. CeO2-supported Au and AuCu catalysts for CO oxidation: Impact of activation protocol and residual chlorine on the active sites. Catal Today 2021. [DOI: 10.1016/j.cattod.2020.07.034] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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4
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Rodrigues Fiuza TE, Santos Gonçalves D, Zanchet D. The Impact of Ceria Loading on the CuO
x
−CeO
2
Interaction and Performance of AuCu/CeO
2
−SiO
2
Catalysts in CO‐PROX Reaction. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100561] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Tanna Elyn Rodrigues Fiuza
- Institute of Chemistry University of Campinas 13083-970 Campinas São Paulo Brazil
- Present address: Brazilian Nanotechnology National Laboratory (LNNano) Brazilian Center for Research in Energy and Materials (CNPEM) 13083-100 Campinas São Paulo Brazil
| | | | - Daniela Zanchet
- Institute of Chemistry University of Campinas 13083-970 Campinas São Paulo Brazil
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5
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Wang Z, Garg A, Wang L, He H, Dasgupta A, Zanchet D, Janik MJ, Rioux RM, Román-Leshkov Y. Enhancement of Alkyne Semi-Hydrogenation Selectivity by Electronic Modification of Platinum. ACS Catal 2020. [DOI: 10.1021/acscatal.9b04070] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zhenshu Wang
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Aaron Garg
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Linxi Wang
- Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Haoran He
- Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Anish Dasgupta
- Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Daniela Zanchet
- Institute of Chemistry, University of Campinas, Campinas, São Paulo 13083-970, Brazil
| | - Michael J. Janik
- Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Robert M. Rioux
- Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Yuriy Román-Leshkov
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
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6
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Garg A, Gonçalves DS, Liu Y, Wang Z, Wang L, Yoo JS, Kolpak A, Rioux RM, Zanchet D, Román-Leshkov Y. Impact of Transition Metal Carbide and Nitride Supports on the Electronic Structure of Thin Platinum Overlayers. ACS Catal 2019. [DOI: 10.1021/acscatal.9b01272] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | | | | | | | | | | | | | - Daniela Zanchet
- Institute of Chemistry, University of Campinas, Campinas, SP 13083-970, Brazil
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7
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Borges LR, Lopez‐Castillo A, Meira DM, Gallo JMR, Zanchet D, Bueno JMC. Effect of the Pt Precursor and Loading on the Structural Parameters and Catalytic Properties of Pt/Al
2
O
3. ChemCatChem 2019. [DOI: 10.1002/cctc.201900092] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Lais R. Borges
- Department of Chemical EngineeringFederal University of São Carlos Rod. Washington Luis s/n, km 235, P.O. Box 676 13565-905 São Carlos-SP Brazil
| | - Alejandro Lopez‐Castillo
- Department of ChemistryFederal University of São Carlos Rod. Washington Luis s/n, km 235, P.O. Box 676 13565-905 São Carlos-SP Brazil
| | - Debora M. Meira
- Department of Chemical EngineeringFederal University of São Carlos Rod. Washington Luis s/n, km 235, P.O. Box 676 13565-905 São Carlos-SP Brazil
| | - Jean Marcel R. Gallo
- Department of ChemistryFederal University of São Carlos Rod. Washington Luis s/n, km 235, P.O. Box 676 13565-905 São Carlos-SP Brazil
| | - Daniela Zanchet
- Institute of ChemistryCampinas State University Rod. Washington Luis s/n, km 235, P.O. Box 676 13565-905 São Carlos-SP Brazil
| | - José Maria C. Bueno
- Department of Chemical EngineeringFederal University of São Carlos Rod. Washington Luis s/n, km 235, P.O. Box 676 13565-905 São Carlos-SP Brazil
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8
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Shetty M, Zanchet D, Green WH, Román-Leshkov Y. Cooperative Co 0 /Co II Sites Stabilized by a Perovskite Matrix Enable Selective C-O and C-C bond Hydrogenolysis of Oxygenated Arenes. ChemSusChem 2019; 12:2171-2175. [PMID: 30848866 DOI: 10.1002/cssc.201900664] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Indexed: 06/09/2023]
Abstract
Strontium-substituted lanthanum cobaltite (La0.8 Sr0.2 CoO3 ) matrix-stabilized Co0 /CoII catalytic sites were prepared, which present tunable C-O and C-C hydrogenolysis activity for the vapor-phase upgrading of oxygenated arenes. CoII sites associated with oxygen vacancies were favored at low temperatures and performed selective C-O hydrogenolysis, in which Sr-substitution facilitated oxygen vacancy formation, leading to approximately 10 times higher reactivity compared to undoped LaCoO3 . Co0 sites were favored at high temperatures and performed extensive C-C bond hydrogenolysis, generating a wide range of alkanes. The lower reaction order with P H 2 (1.1±0.1) for C-C hydrogenolysis than for C-O hydrogenolysis (2.0±0.1) led to a high selectivity towards C-C hydrogenolysis at low P H 2 . The Co3 O4 surfaces featured a narrower temperature window for obtaining the respective optimal CoII and Co0 pairs compared to analogous perovskite surfaces; whereas, the perovskite matrix stabilizes these pairs for selective C-O and C-C hydrogenolysis. This stabilization effect offers an additional handle to control reactivity in oxide catalysts.
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Affiliation(s)
- Manish Shetty
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Daniela Zanchet
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
- Institute of Chemistry, University of Campinas, Campinas, SP-13083-970, Brazil
| | - William H Green
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Yuriy Román-Leshkov
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
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9
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Destro P, Cantaneo DA, Meira DM, dos Santos Honório G, da Costa LS, Bueno JMC, Zanchet D. Formation of Bimetallic Copper–Gold Alloy Nanoparticles Probed by in Situ X‐ray Absorption Fine Structure Spectroscopy. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800413] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Priscila Destro
- Institute of Chemistry University of Campinas P.O. Box 6154 13083‐970 Campinas SP Brazil
| | | | - Débora M. Meira
- Department of Chemical Engineering Federal University of São Carlos P.O. Box 676 13565‐905 São Carlos SP Brazil
| | | | - Luelc Souza da Costa
- Institute of Chemistry University of Campinas P.O. Box 6154 13083‐970 Campinas SP Brazil
| | - José Maria C. Bueno
- Department of Chemical Engineering Federal University of São Carlos P.O. Box 676 13565‐905 São Carlos SP Brazil
| | - Daniela Zanchet
- Institute of Chemistry University of Campinas P.O. Box 6154 13083‐970 Campinas SP Brazil
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10
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Iida T, Zanchet D, Ohara K, Wakihara T, Román‐Leshkov Y. Concerted Bimetallic Nanocluster Synthesis and Encapsulation via Induced Zeolite Framework Demetallation for Shape and Substrate Selective Heterogeneous Catalysis. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201800557] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Takayuki Iida
- Department of Chemical System Engineering The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 113-8656 Japan
- Department of Chemical Engineering Massachusetts Institute of Technology 25 Ames Street Cambridge MA 02139 USA
| | - Daniela Zanchet
- Department of Chemical Engineering Massachusetts Institute of Technology 25 Ames Street Cambridge MA 02139 USA
- Institute of Chemistry University of Campinas PO 6154 Campinas SP 13083-970 Brazil
| | - Koji Ohara
- Japan Synchrotron Radiation Research Institute/SPring-8 Kouto 1-1-1 Sayo-gun Hyogo 679-5198 Japan
| | - Toru Wakihara
- Department of Chemical System Engineering The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 113-8656 Japan
| | - Yuriy Román‐Leshkov
- Department of Chemical Engineering Massachusetts Institute of Technology 25 Ames Street Cambridge MA 02139 USA
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11
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Iida T, Zanchet D, Ohara K, Wakihara T, Román-Leshkov Y. Concerted Bimetallic Nanocluster Synthesis and Encapsulation via Induced Zeolite Framework Demetallation for Shape and Substrate Selective Heterogeneous Catalysis. Angew Chem Int Ed Engl 2018; 57:6454-6458. [PMID: 29575492 DOI: 10.1002/anie.201800557] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2018] [Indexed: 11/11/2022]
Abstract
Bimetallic nanoparticle encapsulation in microporous zeolite crystals is a promising route for producing catalysts with unprecedented reaction selectivities. Herein, a novel synthetic approach was developed to produce PtZnx nanoclusters encapsulated inside zeolite micropores by introducing Pt2+ cations into a zincosilicate framework via ion exchange, and subsequent controlled demetallation and alloying with framework Zn. The resulting zeolites featured nanoclusters with sizes of approximately 1 nm, having an interatomic structure corresponding to a PtZnx alloy as confirmed by pair distribution function (PDF) analysis. These materials featured simultaneous shape and substrate specificity demonstrated by the selective production of p-chloroaniline from the competitive hydrogenation of p-chloronitrobenzene and 1,3-dimethyl-5-nitrobenzene.
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Affiliation(s)
- Takayuki Iida
- Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan.,Department of Chemical Engineering, Massachusetts Institute of Technology, 25 Ames Street, Cambridge, MA, 02139, USA
| | - Daniela Zanchet
- Department of Chemical Engineering, Massachusetts Institute of Technology, 25 Ames Street, Cambridge, MA, 02139, USA.,Institute of Chemistry, University of Campinas, PO 6154, Campinas, SP 13083-970, Brazil
| | - Koji Ohara
- Japan Synchrotron Radiation Research Institute/SPring-8, Kouto 1-1-1, Sayo-gun, Hyogo, 679-5198, Japan
| | - Toru Wakihara
- Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Yuriy Román-Leshkov
- Department of Chemical Engineering, Massachusetts Institute of Technology, 25 Ames Street, Cambridge, MA, 02139, USA
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12
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Carvalho DR, Aragao IB, Zanchet D. Pt-CeO₂ Catalysts Synthesized by Glucose Assisted Hydrothermal Method: Impact of Calcination Parameters on the Structural Properties and Catalytic Performance in PROX-CO. J Nanosci Nanotechnol 2018; 18:3405-3412. [PMID: 29442845 DOI: 10.1166/jnn.2018.14659] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We synthesized Pt supported catalysts by the glucose assisted hydrothermal method, in which a carbon template was used to form a porous CeO2 structure upon calcination. Special emphasis was given to evaluate the influence of calcination parameters in the structural and textural properties of the catalysts and the final impact in the catalytic activity of CO oxidation reaction under hydrogen rich atmosphere (PROX-CO). We show that at 350 °C the carbon matrix was already mostly burnt and that higher temperatures and holding times mostly increase the CeO2 crystallite sizes. The sample prepared at 350 °C presented the highest surface area, 106 m2 ·g-1, in comparison to 60-70 m2 ·g-1 obtained for all other conditions. Transmission electron microscopy images of the catalyst calcined at 600 °C for 6 h showed 200 nm spheres formed by aggregation of ceria crystallites with crystalline domains of about 20 nm. All samples showed similar catalytic activity in PROX-CO indicating that the creation of the catalytic sites were mostly determined during the synthesis conditions and the catalytic performance were not deeply affected by the differences on CeOx matrix.
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Affiliation(s)
- Diego R Carvalho
- Institute of Chemistry, University of Campinas-UNICAMP, C.P. 6154, 13083-970, Campinas, SP, Brazil
| | - Isaias B Aragao
- Institute of Chemistry, University of Campinas-UNICAMP, C.P. 6154, 13083-970, Campinas, SP, Brazil
| | - Daniela Zanchet
- Institute of Chemistry, University of Campinas-UNICAMP, C.P. 6154, 13083-970, Campinas, SP, Brazil
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13
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Destro P, Kokumai TM, Scarpellini A, Pasquale L, Manna L, Colombo M, Zanchet D. The Crucial Role of the Support in the Transformations of Bimetallic Nanoparticles and Catalytic Performance. ACS Catal 2018. [DOI: 10.1021/acscatal.7b03685] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Priscila Destro
- Institute
of Chemistry, University of Campinas, P.O. Box 6154, Campinas-SP 13083-970, Brazil
| | - Tathiana M. Kokumai
- Institute
of Chemistry, University of Campinas, P.O. Box 6154, Campinas-SP 13083-970, Brazil
| | | | - Lea Pasquale
- Dipartimento
di Chimica e Chimica Industriale, Università di Genova, Via Dodecaneso
31, Genova 16146 Italy
| | | | | | - Daniela Zanchet
- Institute
of Chemistry, University of Campinas, P.O. Box 6154, Campinas-SP 13083-970, Brazil
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14
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Garg A, Milina M, Ball M, Zanchet D, Hunt ST, Dumesic JA, Román‐Leshkov Y. Transition‐Metal Nitride Core@Noble‐Metal Shell Nanoparticles as Highly CO Tolerant Catalysts. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201704632] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Aaron Garg
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA
| | - Maria Milina
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA
| | - Madelyn Ball
- Department of Chemical and Biological Engineering University of Wisconsin-Madison Madison WI 53706 USA
| | - Daniela Zanchet
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA
- Institute of Chemistry University of Campinas Campinas SP 13083-970 Brazil
| | - Sean T. Hunt
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA
| | - James A. Dumesic
- Department of Chemical and Biological Engineering University of Wisconsin-Madison Madison WI 53706 USA
| | - Yuriy Román‐Leshkov
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA
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15
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Garg A, Milina M, Ball M, Zanchet D, Hunt ST, Dumesic JA, Román‐Leshkov Y. Transition‐Metal Nitride Core@Noble‐Metal Shell Nanoparticles as Highly CO Tolerant Catalysts. Angew Chem Int Ed Engl 2017; 56:8828-8833. [DOI: 10.1002/anie.201704632] [Citation(s) in RCA: 66] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Indexed: 11/08/2022]
Affiliation(s)
- Aaron Garg
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA
| | - Maria Milina
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA
| | - Madelyn Ball
- Department of Chemical and Biological Engineering University of Wisconsin-Madison Madison WI 53706 USA
| | - Daniela Zanchet
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA
- Institute of Chemistry University of Campinas Campinas SP 13083-970 Brazil
| | - Sean T. Hunt
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA
| | - James A. Dumesic
- Department of Chemical and Biological Engineering University of Wisconsin-Madison Madison WI 53706 USA
| | - Yuriy Román‐Leshkov
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA
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16
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Liu Y, Göeltl F, Ro I, Ball MR, Sener C, Aragão IB, Zanchet D, Huber GW, Mavrikakis M, Dumesic JA. Synthesis Gas Conversion over Rh-Based Catalysts Promoted by Fe and Mn. ACS Catal 2017. [DOI: 10.1021/acscatal.7b01381] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yifei Liu
- Department
of Chemical and Biological Engineering, University of Wisconsin—Madison, 1415 Engineering Drive, Madison, Wisconsin 53706, United States
| | - Florian Göeltl
- Department
of Chemical and Biological Engineering, University of Wisconsin—Madison, 1415 Engineering Drive, Madison, Wisconsin 53706, United States
| | - Insoo Ro
- Department
of Chemical and Biological Engineering, University of Wisconsin—Madison, 1415 Engineering Drive, Madison, Wisconsin 53706, United States
| | - Madelyn R. Ball
- Department
of Chemical and Biological Engineering, University of Wisconsin—Madison, 1415 Engineering Drive, Madison, Wisconsin 53706, United States
| | - Canan Sener
- Department
of Chemical and Biological Engineering, University of Wisconsin—Madison, 1415 Engineering Drive, Madison, Wisconsin 53706, United States
| | - Isaias Barbosa Aragão
- Department
of Chemical and Biological Engineering, University of Wisconsin—Madison, 1415 Engineering Drive, Madison, Wisconsin 53706, United States
- Institute
of Chemistry, University of Campinas (UNICAMP), P.O. Box 6154, 13083-970 Campinas, São Paulo, Brazil
| | - Daniela Zanchet
- Institute
of Chemistry, University of Campinas (UNICAMP), P.O. Box 6154, 13083-970 Campinas, São Paulo, Brazil
| | - George W. Huber
- Department
of Chemical and Biological Engineering, University of Wisconsin—Madison, 1415 Engineering Drive, Madison, Wisconsin 53706, United States
| | - Manos Mavrikakis
- Department
of Chemical and Biological Engineering, University of Wisconsin—Madison, 1415 Engineering Drive, Madison, Wisconsin 53706, United States
| | - James A. Dumesic
- Department
of Chemical and Biological Engineering, University of Wisconsin—Madison, 1415 Engineering Drive, Madison, Wisconsin 53706, United States
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17
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Caldas PCP, Gallo JMR, Lopez-Castillo A, Zanchet D, C. Bueno JM. The Structure of the Cu–CuO Sites Determines the Catalytic Activity of Cu Nanoparticles. ACS Catal 2017. [DOI: 10.1021/acscatal.6b03642] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
| | | | | | - Daniela Zanchet
- Institute
of Chemistry, University of Campinas, P.O. Box 6154, 13083-970 Campinas, São Paulo, Brazil
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18
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Costa LSD, Zanchet D. Pretreatment impact on the morphology and the catalytic performance of hybrid heterodimers nanoparticles applied to CO oxidation. Catal Today 2017. [DOI: 10.1016/j.cattod.2016.06.056] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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19
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Najafishirtari S, Kokumai TM, Marras S, Destro P, Prato M, Scarpellini A, Brescia R, Lak A, Pellegrino T, Zanchet D, Manna L, Colombo M. Dumbbell-like Au 0.5Cu 0.5@Fe 3O 4 Nanocrystals: Synthesis, Characterization, and Catalytic Activity in CO Oxidation. ACS Appl Mater Interfaces 2016; 8:28624-28632. [PMID: 27723286 DOI: 10.1021/acsami.6b09813] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We report the colloidal synthesis of dumbbell-like Au0.5Cu0.5@Fe3O4 nanocrystals (AuCu@FeOx NCs) and the study of their properties in the CO oxidation reaction. To this aim, the as-prepared NCs were deposited on γ-alumina and pretreated in an oxidizing environment to remove the organic ligands. A comparison of these NCs with bulk Fe3O4-supported AuCu NCs showed that the nanosized support was far more effective in preventing the sintering of the metal domains, leading thus to a superior catalytic activity. Nanosizing of the support could be thus an effective, general strategy to improve the thermal stability of metallic NCs. On the other hand, the support size did not affect the chemical transformations experienced by the AuCu NCs during the activation step. Independently from the support size, we observed indeed the segregation of Cu from the alloy phase under oxidative conditions as well as the possible incorporation of the Cu atoms in the iron oxide domain.
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Affiliation(s)
- Sharif Najafishirtari
- Dipartimento di Chimica e Chimica Industriale, Università di Genova , via Dodecaneso 31-I, 16146 Genova, Italy
| | - Tathiana Midori Kokumai
- Institute of Chemistry, University of Campinas (UNICAMP), P.O. Box 6154, 13083-970 Campinas, São Paulo, Brazil
| | | | - Priscila Destro
- Institute of Chemistry, University of Campinas (UNICAMP), P.O. Box 6154, 13083-970 Campinas, São Paulo, Brazil
| | | | | | | | | | | | - Daniela Zanchet
- Institute of Chemistry, University of Campinas (UNICAMP), P.O. Box 6154, 13083-970 Campinas, São Paulo, Brazil
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20
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Destro P, Colombo M, Prato M, Brescia R, Manna L, Zanchet D. Au1−xCux colloidal nanoparticles synthesized via a one-pot approach: understanding the temperature effect on the Au : Cu ratio. RSC Adv 2016. [DOI: 10.1039/c6ra02027e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Au1−xCux alloy nanoparticles synthesized by one-pot colloidal method with an accurate control of composition by the temperature and insights about the mechanism.
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Affiliation(s)
- Priscila Destro
- Institute of Chemistry
- State University of Campinas (UNICAMP)
- Brazil
| | - Massimo Colombo
- Department of Nanochemistry
- Istituto Italiano di Tecnologia
- 16163 Genova
- Italy
| | - Mirko Prato
- Department of Nanochemistry
- Istituto Italiano di Tecnologia
- 16163 Genova
- Italy
| | - Rosaria Brescia
- Department of Nanochemistry
- Istituto Italiano di Tecnologia
- 16163 Genova
- Italy
| | - Liberato Manna
- Department of Nanochemistry
- Istituto Italiano di Tecnologia
- 16163 Genova
- Italy
| | - Daniela Zanchet
- Institute of Chemistry
- State University of Campinas (UNICAMP)
- Brazil
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21
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Affiliation(s)
- Daniela Zanchet
- Institute
of Chemistry, State University of Campinas (UNICAMP)
, P.O. Box 6154, 13083-970
Campinas, São
Paulo, Brazil
| | - Joao Batista O. Santos
- Department
of Chemical Engineering, Federal University of São Carlos (UFSCar)
, P.O. Box
676, 13565-905
São Carlos, São Paulo, Brazil
| | - Sonia Damyanova
- Institute
of Catalysis, Bulgarian Academy of Sciences
, 1113
Sofia, Bulgaria
| | - Jean Marcel R. Gallo
- Department
of Chemistry, Federal University of São Carlos (UFSCar)
, P.O. Box 676, 13565-905
São Carlos, São Paulo, Brazil
| | - José Maria C. Bueno
- Department
of Chemical Engineering, Federal University of São Carlos (UFSCar)
, P.O. Box
676, 13565-905
São Carlos, São Paulo, Brazil
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22
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Corricelli M, Altamura D, Curri ML, Sibillano T, Siliqi D, Mazzone A, Depalo N, Fanizza E, Zanchet D, Giannini C, Striccoli M. GISAXS and GIWAXS study on self-assembling processes of nanoparticle based superlattices. CrystEngComm 2014. [DOI: 10.1039/c4ce01291g] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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23
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Chakr R, Gasparin A, Neves M, Rangel G, Hendler J, Moro A, Zanchet D, Siqueira I, Hax V, Palominos P, Bredemeier M, Kohem C, Brenol C, Monticielo O, Brenol J, Xavier R. FRI0494 Long-Term Effectiveness and Safety of Cyclophosphamide in Systemic Sclerosis Lung Disease. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2014-eular.3044] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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24
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Chakr R, Behar M, Mendonça J, Moro A, Zanchet D, Siqueira I, Hax V, Gasparin A, Palominos P, Kohem C, Brenol C, Monticielo O, Xavier R, Brenol J. SAT0208 Seven-Joint Power Doppler Ultrasound Score is Discordant to DAS28, SDAI and CDAI in Treatment Target Identification in Rheumatoid Arthritis Patients with Fibromyalgia. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2014-eular.3306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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25
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Gasparin A, Hendler J, Souza L, Chakr R, Moro A, Hax V, Zanchet D, Siqueira I, Palominos P, Brenol C, Kohem C, Xavier R, Brenol J, Monticielo O. SAT0007 Systemic Lupus Erythematosus: Survival Analysis in Patients Followed at A Tertiary Care Center in Southern Brazil. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2014-eular.4165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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26
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Monticielo O, Gasparin A, Hendler J, Chakr R, Moro A, Hax V, Zanchet D, Siqueira I, Palominos P, Brenol C, Kohem C, Xavier R, Sassi R, Piccoli G, Brenol J. THU0019 Onset AGE Influences Clinical and Laboratory Profile of Patients with Systemic Lupus Erythematosus. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2014-eular.4193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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27
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Chakr R, Pavan T, Siqueira I, Zanchet D, Calegaro N, Andrade N, Neto G, Neves M, Bredemeier M, Palominos P, Kohem C, Amorin B, Valim V, Alegretti A, Silla L, Monticielo O, Brenol C, Xavier R, Brenol J. AB0505 Case report of allogeneic unrelated-donor mesenchymal stem cells (msc) infusion in systemic sclerosis (ssc). Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2013-eular.2827] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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28
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Costa NJS, Jardim RF, Masunaga SH, Zanchet D, Landers R, Rossi LM. Direct Access to Oxidation-Resistant Nickel Catalysts through an Organometallic Precursor. ACS Catal 2012. [DOI: 10.1021/cs200609e] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Natália J. S. Costa
- Instituto de Química, Universidade de São Paulo, 05508-000 São
Paulo, SP, Brazil
| | - Renato F. Jardim
- Instituto
de Física, Universidade de São Paulo, 05315-970 São
Paulo, SP, Brazil
| | - Sueli H. Masunaga
- Instituto
de Física, Universidade de São Paulo, 05315-970 São
Paulo, SP, Brazil
| | | | | | - Liane M. Rossi
- Instituto de Química, Universidade de São Paulo, 05508-000 São
Paulo, SP, Brazil
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29
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Ávila-Neto C, Liberatori J, da Silva A, Zanchet D, Hori C, Noronha F, Bueno J. Understanding the stability of Co-supported catalysts during ethanol reforming as addressed by in situ temperature and spatial resolved XAFS analysis. J Catal 2012. [DOI: 10.1016/j.jcat.2011.12.013] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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30
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Gomez A, Zanchet D, Pritchard B, Kyciaa S. Debye–Waller factor and thermal expansion in gold nanoparticles. Acta Crystallogr A 2011. [DOI: 10.1107/s0108767311098692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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31
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Naidek KP, Bianconi F, da Rocha TCR, Zanchet D, Bonacin JA, Novak MA, das Graças Fialho Vaz M, Winnischofer H. Structure and morphology of spinel MFe2O4 (M=Fe, Co, Ni) nanoparticles chemically synthesized from heterometallic complexes. J Colloid Interface Sci 2011; 358:39-46. [DOI: 10.1016/j.jcis.2011.03.001] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2010] [Revised: 01/18/2011] [Accepted: 03/01/2011] [Indexed: 10/18/2022]
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32
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Oliveira RL, Zanchet D, Kiyohara PK, Rossi LM. On the Stabilization of Gold Nanoparticles over Silica‐Based Magnetic Supports Modified with Organosilanes. Chemistry 2011; 17:4626-31. [DOI: 10.1002/chem.201002251] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2010] [Revised: 10/27/2010] [Indexed: 11/06/2022]
Affiliation(s)
- Rafael L. Oliveira
- Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes 748 São Paulo, 05508‐000 São Paulo (Brazil), Fax: (+55) 1138155579
| | - Daniela Zanchet
- Laboratório Nacional de Luz Síncrotron, CP 6192, Campinas, 13083‐970 São Paulo (Brazil)
- Instituto de Química, Universidade Estadual de Campinas, CP 6154 Campinas, 13083‐970, São Paulo (Brazil)
| | - Pedro K. Kiyohara
- Instituto de Física, Universidade de São Paulo, CP 66318, 05315‐970 São Paulo (Brazil)
| | - Liane M. Rossi
- Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes 748 São Paulo, 05508‐000 São Paulo (Brazil), Fax: (+55) 1138155579
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33
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Prieto P, Ferreira A, Haddad P, Zanchet D, Bueno J. Designing Pt nanoparticles supported on CeO2–Al2O3: Synthesis, characterization and catalytic properties in the steam reforming and partial oxidation of methane. J Catal 2010. [DOI: 10.1016/j.jcat.2010.09.025] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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34
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Migowski P, Zanchet D, Machado G, Gelesky MA, Teixeira SR, Dupont J. Nanostructures in ionic liquids: correlation of iridium nanoparticles’ size and shape with imidazolium salts’ structural organization and catalytic properties. Phys Chem Chem Phys 2010; 12:6826-33. [DOI: 10.1039/b925834e] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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35
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Haddad PS, Rocha TR, Souza EA, Martins TM, Knobel M, Zanchet D. Interplay between crystallization and particle growth during the isothermal annealing of colloidal iron oxide nanoparticles. J Colloid Interface Sci 2009; 339:344-50. [DOI: 10.1016/j.jcis.2009.07.068] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2009] [Revised: 07/17/2009] [Accepted: 07/29/2009] [Indexed: 11/30/2022]
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36
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Rinaldi R, Porcari ADM, Rocha TC, Cassinelli WH, Ribeiro RU, Bueno JMC, Zanchet D. Construction of heterogeneous Ni catalysts from supports and colloidal nanoparticles – A challenging puzzle. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/j.molcata.2008.11.001] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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37
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Rodella CB, Kellermann G, Francisco MSP, Jordão MH, Zanchet D. Textural and Structural Analyses of Industrial Raney Nickel Catalyst. Ind Eng Chem Res 2008. [DOI: 10.1021/ie800543t] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Cristiane B. Rodella
- Laboratório Nacional de Luz Síncrotron (LNLS), C.P. 6192, 13083-970, Campinas SP, Brazil
| | - Guinther Kellermann
- Laboratório Nacional de Luz Síncrotron (LNLS), C.P. 6192, 13083-970, Campinas SP, Brazil
| | | | - Maura H. Jordão
- Laboratório Nacional de Luz Síncrotron (LNLS), C.P. 6192, 13083-970, Campinas SP, Brazil
| | - Daniela Zanchet
- Laboratório Nacional de Luz Síncrotron (LNLS), C.P. 6192, 13083-970, Campinas SP, Brazil
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38
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Abstract
Quantitative characterization of images of nanocrystals and nanostructures is a challenging but important task. The development and optimization of methods for the construction of complex nanostructures rely on imaging techniques. Computer programs were developed to quantify TEM images of nanocrystal/DNA nanostructures, and results are presented for heterodimers and trimers of gold nanocrystals. The programs presented here have also been used to analyze more complex trimers and tetramers linked by branched DNA, as well as for structures made from attaching gold nanocrystals to CdSe/ZnS core-shell quantum dots. This work has the additional goal of enabling others to quickly and easily adapt the methods for their own use.
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Affiliation(s)
- C M Micheel
- Department of Chemistry, University of California-Berkeley, and Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
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39
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Winnischofer H, Rocha TCR, Nunes WC, Socolovsky LM, Knobel M, Zanchet D. Chemical synthesis and structural characterization of highly disordered N colloidal nanoparticles. ACS Nano 2008; 2:1313-9. [PMID: 19206350 DOI: 10.1021/nn700152w] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
This work focuses on synthetic methods to produce monodisperse Ni colloidal nanoparticles (NPs), in the 4-16 nm size range, and their structural characterization. Narrow size distribution nanoparticles were obtained by high-temperature reduction of a nickel salt and the production of tunable sizes of the Ni NPs was improved compared to other methods previously described. The as-synthesized nanoparticles exhibited spherical shape and highly disordered structure, as it could be assigned by X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM). Annealing at high temperature in organic solvent resulted in an increase of nanoparticle atomic ordering; in this case, the XRD pattern showed an fcc-like structure. Complementary data obtained by X-ray absorption spectroscopy confirmed the complex structure of these nanoparticles. Temperature dependence of the magnetic susceptibility of these highly disordered Ni NPs showed the magnetic behavior cannot be described by the conventional superparamagnetic theory, claiming the importance of the internal structure in the magnetic behavior of such nanomaterials.
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Affiliation(s)
- Herbert Winnischofer
- LNLS-Brazilian Synchrotron Light Laboratory, C.P. 6192, Campinas, SP, 13083-970, Brazil
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40
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Scariot M, Francisco MSP, Jordão MH, Zanchet D, Logli MA, Vicentini VP. An investigation of the activation process of high temperature shift catalyst. Catal Today 2008. [DOI: 10.1016/j.cattod.2007.12.090] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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41
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Vargas JM, Lima E, Socolovsky LM, Knobel M, Zanchet D, Zysler RD. Annealing effects on 5 nm iron oxide nanoparticles. J Nanosci Nanotechnol 2007; 7:3313-3317. [PMID: 18019166 DOI: 10.1166/jnn.2007.688] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Morphological, structural and magnetic properties of 4.8 nm iron oxide nanoparticles have been investigated after annealing under inert atmosphere at different temperatures. The as-prepared iron oxide nanoparticles have been synthesized by chemical route from high temperature reaction of Fe(acac)3 solution in presence of oleic acid and oleylamine surfactant. Annealing the particles at low temperatures (Tann = 573 K) produces an increment of the mean size from 4.8 nm to 6.0 nm, preserving the same morphology. The coercive field of the annealed sample has a small increasing with respect to the as-prepared sample in agreement with the mean particle volume change. Annealing at higher temperature (Tann = 823 K) leads to a bimodal size distribution of the iron oxide nanoparticles with 6.0 nm and 17 nm mean sizes respectively, where the bigger particles dominate the observed magnetic properties.
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Affiliation(s)
- J M Vargas
- Centro Atómico Bariloche and Comisión Nacional de Energía Atómica, 8400 San Carlos de Bariloche, Rio Negro, Argentina
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42
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Abstract
Aspects of the growth mechanism of silver triangular nanoplates by photochemical synthesis were addressed by detailed characterization using ultraviolet-visible spectroscopy, electron microscopies, and atomic force microscopy. The quantitative characterization of their size and thickness during the reaction showed that both increase with time as well as the aspect ratio. Samples irradiated by different wavelengths showed that the size of the nanoplates can be controlled by the incident wavelength and it is responsible for the increase of the aspect ratio, but the thickness seems to be determined by the conditions of the initial seeds. It was also found that irradiation with wavelength out of resonance with the surface plasmon of the initial seeds leads to a slower kinetics. The results suggested that rational exploration of the synthesis parameter such as the type of the initial seeds in combination with the wavelength irradiation may lead to a broader type of particles already obtained by this method.
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Affiliation(s)
- Túlio C R Rocha
- Laboratório Nacional de Luz Síncrotron, C.P 6192, 13084-971 Campinas (SP), Brazil
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43
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Guagliardi A, Cervellino A, Giannini C, Zanchet D, Ladisa M. Whole powder pattern methods for nanoparticles characterization. Acta Crystallogr A 2006. [DOI: 10.1107/s0108767306098333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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44
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Oliveira MM, Castro EG, Canestraro CD, Zanchet D, Ugarte D, Roman LS, Zarbin AJG. A Simple Two-Phase Route to Silver Nanoparticles/Polyaniline Structures. J Phys Chem B 2006; 110:17063-9. [PMID: 16928000 DOI: 10.1021/jp060861f] [Citation(s) in RCA: 91] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Novel silver nanoparticles/polyaniline composites were obtained through a two-phase water/toluene interfacial reaction. We show that by rigorously controlling the reaction time, different structures of the nanocomposites can be obtained, such as a thin sheet of polyaniline around the silver nanoparticles or a polymer mass with nanoparticles homogeneously embedded within it. Samples were characterized by FT-IR, UV-vis-NIR and Raman spectroscopy, X-ray diffraction, cyclic voltammetry, TEM, and HRTEM. Conductivity and current-voltage characteristics of the nanocomposites were measured, and the results indicate that different properties result from the different structures in which the nanocomposites were formed.
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Affiliation(s)
- Marcela M Oliveira
- Departamento de Química, Universidade Federal do Parana, CP 19081, CEP 81531-990, Curitiba-PR, Brazil
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45
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González JC, da Silva MIN, Lozano XS, Zanchet D, Ugarte D, Ribeiro E, Gutiérrez HR, Cotta MA. Structural and optical characterization of strained free-standing InP nanowires. J Nanosci Nanotechnol 2006; 6:2182-6. [PMID: 17025146 DOI: 10.1166/jnn.2006.353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
The structural and optical properties of high-quality crystalline strained InP nanowires are reported in this article. The nanowires were produced by the vapor-liquid-solid growth method in a chemical-beam epitaxy reactor, using 20 nm gold nanoparticles as catalysts. Polarization-resolved photoluminescence experiments were carried out to study the optical properties of the InP nanowires. These experiments revealed a large blue shift of 74 meV of the first electron-to-heavy hole optical transition in the nanowires, which cannot be solely explained by quantum size effects. The blue shift is mainly attributed to the presence of biaxial compressive strain in the inward radial direction of the InP nanowires. High-resolution transmission electron microscopy Electron and selected area electron diffraction experiments show that the nanowires have high crystal quality and grow along a [001] axes. These experiments also confirmed the presence of 1.8% compressive radial strain and 2% tensile longitudinal strain in the nanowires. A simple theoretical model including both quantum confinement and strain effects consistently describes the actual energy position of the InP nanowires optical emission.
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Affiliation(s)
- J C González
- Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
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46
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Oliveira MM, Ugarte D, Zanchet D, Zarbin AJG. Influence of synthetic parameters on the size, structure, and stability of dodecanethiol-stabilized silver nanoparticles. J Colloid Interface Sci 2005; 292:429-35. [PMID: 16055140 DOI: 10.1016/j.jcis.2005.05.068] [Citation(s) in RCA: 115] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2005] [Revised: 05/19/2005] [Accepted: 05/23/2005] [Indexed: 10/25/2022]
Abstract
Metal nanoparticles (NP) are very attractive because of their size- and shape-dependent properties. A widely used preparation of ligand-stabilized metal NP is the two-phase liquid-liquid method using dodecanethiol (DT) as ligand. This work presents various procedures to synthesize dodecanethiol-capped silver NPs, all of them based on a two-phase liquid-liquid method. Small alterations in the synthetic parameters lead to dramatic modifications in the nanoparticles' average size, size distribution width, stability, and structure, as well as in their ability to self-assemble.
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Affiliation(s)
- Marcela M Oliveira
- Departamento de Química, Universidade Federal do Paraná, CEP 81531-990, Curitiba, PR, Brazil
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47
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Guagliardi A, Cervellino A, Giannini C, Ladisa M, Zanchet D. Whole powder pattern fitting methods focused on nanocrystalline materials. Acta Crystallogr A 2005. [DOI: 10.1107/s0108767305093049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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48
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Giannini C, Guagliardi A, Zanchet D, Cervellino A, Ladisa M. X-ray powder diffraction characterization of nanoparticles. Acta Crystallogr A 2005. [DOI: 10.1107/s0108767305082814] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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49
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Castro RHR, Hidalgo P, Coaquira JAH, Bettini J, Zanchet D, Gouvêa D. Surface Segregation in SnO2-Fe2O3 Nanopowders and Effects in Mössbauer Spectroscopy. Eur J Inorg Chem 2005. [DOI: 10.1002/ejic.200400879] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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50
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Abstract
hcp Co disk-shaped nanocrystals were obtained by rapid decomposition of cobalt carbonyl in the presence of linear amines. Other surfactants, in addition to the amines, like phosphine oxides and oleic acid were used to improve size dispersion, shape control, and nanocrystal stability. Co disks are ferromagnetic in character and they spontaneously self-assemble into long ribbons. X-ray and electron diffraction, electron microscopy, and SQUID magnetometry have been employed to characterize this material.
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Affiliation(s)
- Victor F Puntes
- Chemistry Department and Materials Science Department, University of California, Berkeley 94720, USA.
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