51
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Sabarinath S, Prabha Rajeev S, Rajendra Kumar PK, Prabhakaran Nair K. Development of fully formulated eco-friendly nanolubricant from sesame oil. APPLIED NANOSCIENCE 2019. [DOI: 10.1007/s13204-019-01121-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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52
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Lionetto F, López-Muñoz R, Espinoza-González C, Mis-Fernández R, Rodríguez-Fernández O, Maffezzoli A. A Study on exfoliation of Expanded Graphite Stacks in Candelilla Wax. MATERIALS (BASEL, SWITZERLAND) 2019; 12:E2530. [PMID: 31398950 PMCID: PMC6721147 DOI: 10.3390/ma12162530] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Revised: 07/30/2019] [Accepted: 08/01/2019] [Indexed: 12/14/2022]
Abstract
A novel, green route for pre-exfoliation of graphite based on a biodegradable polymer and high-power ultrasound is presented. Candelilla wax (CW), derived from the leaves of the candelilla plant, has been used for the first time as a natural non aqueous medium to induce the pre-exfoliation of expanded graphite (EG) under ultrasonic irradiation in an economical way. The proposed method uses also D-limonene as a natural organic solvent for reducing viscosity and increasing the affinity between the polar groups of EG and candelilla wax, thus improving the intercalation/exfoliation of EG. The quality of dispersion of the nanofiller in the natural wax matrix has been evaluated using multiple techniques. The addition of EG to wax and use of ultrasonic treatment leads to a reduced crystallinity, probably due to restrictions of the molecular movements, improved thermal stability of wax, and to an increased shear thinning exponent, which are all indicative of a high degree of EG dispersion. The ultrasonic dynamic mechanical results suggest a reduction in the cluster size and a better filler dispersion in the wax matrix promoted by polar or chemical reactions between the CW fractions and the graphite stacks, which was observed by XPS analysis. The results were compared to those obtained with paraffin, a synthetic wax, and confirmed the dispersion improvement obtained by using natural wax as a pre-exfoliating medium.
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Affiliation(s)
- Francesca Lionetto
- Department of Mathematics and Physics "Ennio De Giorgi", University of Salento, Via per Arnesano, 73100 Lecce, Italy
| | - Roberto López-Muñoz
- Department of Advanced Materials, Research Center for Applied Chemistry (CIQA), Blvd. Enrique Reyna 140, 25294 Saltillo, Mexico
| | - Carlos Espinoza-González
- Department of Advanced Materials, Research Center for Applied Chemistry (CIQA), Blvd. Enrique Reyna 140, 25294 Saltillo, Mexico.
| | - Ricardo Mis-Fernández
- Applied Physics Department, CINVESTAV-IPN, Apdo. Postal 73, 97310 Mérida, Yucatán, Mexico
| | - Oliverio Rodríguez-Fernández
- Department of Advanced Materials, Research Center for Applied Chemistry (CIQA), Blvd. Enrique Reyna 140, 25294 Saltillo, Mexico
| | - Alfonso Maffezzoli
- Department of Engineering for Innovation, University of Salento, Via per Monteroni, 73100 Lecce, Italy.
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53
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Salehi Artimani J, Ardjmand M, Enhessari M, Javanbakht M. Optimization of reaction parameters affecting crystal phase growth and purity of BaCeO3 and BaCe1-xYbxO3-δ nanopowders and investigating high protonic conductivity of sulfonated poly(ether ether ketone) – BaCe0.85Yb0.15O3-δ composite membrane. CAN J CHEM 2019. [DOI: 10.1139/cjc-2018-0449] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Pure and ytterbium-doped BaCeO3 nanostructures were synthesized by solid-state reaction with the mixtures of Ba(NO3)2, BaCO3, (NH4)2Ce(NO3)6, and Yb2O3 at 800 °C for 10 and 24 h. Doping of ytterbium ions in the BaCeO3 host matrix has been studied and confirmed using powder X-ray diffraction. The results from the Rietveld analysis indicated that the sample has a main BaCeO3 structure with the space group of [Formula: see text]. Through intensive experiments and analysis, optimum reaction conditions for the synthesis of doped nanoparticles including the crystal phase impurity and reaction time are proposed. The results of the study showed that for the reaction time of 24 h, BaCO3 reacted more effectively with (NH4)2Ce(NO3)6 than Ba(NO3)2 did. On the other hand, the purity values of 97% and 95% were obtained for pure and Yb3+ doped BaCeO3 samples, respectively. Field emission scanning electron microscope images revealed that the synthesized BaCeO3 nanomaterials have mono-shaped sphere morphology. Furthermore, ytterbium-doped nanoparticles were incorporated into the matrix of sulfonated poly(ether ether ketone) (SPEEK) membranes (SPYb) with the aim of enhancing proton conductivity. The prepared SPYb nanocomposite membrane containing 1.7 wt.% of BaCe0.85Yb0.15O3-δ nanoparticles exhibited a high proton conductivity (67 mS/cm) at 80 °C.
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Affiliation(s)
- Javad Salehi Artimani
- Department of Chemical Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran
| | - Mehdi Ardjmand
- Department of Chemical Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran
| | - Morteza Enhessari
- Department of Chemistry, Naragh Branch, Islamic Azad University, Naragh, Iran
| | - Mehran Javanbakht
- Department of Chemistry, Amirkabir University of Technology, Tehran, 1599637111, Iran
- Fuel Cell and Solar Cell Laboratory, Renewable Energy Research Center, Amirkabir University of Technology, Tehran, 1599637111, Iran
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54
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Subatomic-Level Solid/Fluid Boundary of Lennard-Jones Atoms: A Molecular Dynamics Study of Metal-Inert Fluid Interface. APPLIED SCIENCES-BASEL 2019. [DOI: 10.3390/app9122439] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
At the molecular scale, the definition of solid/fluid boundary is ambiguous since its defining precision is comparable to the size of the electron orbitals. It is important to figure out the sub-atomic-level solid/fluid boundary as the definition of the solid/fluid interface is related to estimating various properties such as slip length, Kapitza resistance, confined volume, thermodynamic properties, and material properties. In this work, molecular dynamics (MD) simulations were conducted to show the effects of the solid/fluid boundary on estimating thermodynamic properties. Our results reveal that the different definitions of solid/fluid boundary can cause a considerable impact on quantitative analysis and even qualitative analysis of a nanoscale system. The solid/fluid boundary for Lennard-Jones atoms is determined within sub-atomic precision via heat transfer MD simulations and microscopic heat flux relation. The result shows that solid/fluid boundary is slightly shifted to the fluid regime as the temperature increase. We suggested a mathematical expression of solid/fluid boundary of LJ atom that is theoretically estimated by ignoring the thermal vibration. The results presented in this work are expected to improve the accuracy of analyzing nanoscale phenomena as well as the continuum-based models for nanoscale heat and mass transport.
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55
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Numerical Assessment on Rotation Effect of the Stagnation Surface on Nanoparticle Deposition in Flame Synthesis. MATERIALS 2019; 12:ma12091361. [PMID: 31027342 PMCID: PMC6539374 DOI: 10.3390/ma12091361] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Revised: 04/15/2019] [Accepted: 04/17/2019] [Indexed: 11/20/2022]
Abstract
The effect of rotation of the stagnation surface on the nanoparticle deposition in the flame stabilizing on a rotating surface (FSRS) configuration was numerically assessed using CFD method. The deposition properties including particle trajectories, deposition time, temperature and surrounding O2 concentration between the flame and stagnation surface were examined. The results revealed that although flame position is insensitive to the surface rotation, the temperature and velocity fields are remarkably affected, and the deposition properties become asymmetric along the burner centerline when the surface rotates at a fast speed (rotational speed ω ≥ 300 rpm). Particles moving on the windward side have similar deposition properties when the surface rotates slowly, but the off-center particles on the leeward side have remarkable longer deposition time, lower deposition temperature, and lower surrounding O2 concentration, and they even never deposit on the surface when the surface rotates at a high speed. The rotation effect of the stagnation surface can be quantitatively described by an analogous Karlovitz number (Ka’), which is defined as the ratio of characteristic residence time of moving surface to the aerodynamics time induced by flame stretch. For high quality semiconducting metal oxide (SMO) films, it is suggested that Ka’ ≥ 1 should be kept.
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56
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Kanwal Z, Raza MA, Manzoor F, Riaz S, Jabeen G, Fatima S, Naseem S. A Comparative Assessment of Nanotoxicity Induced by Metal (Silver, Nickel) and Metal Oxide (Cobalt, Chromium) Nanoparticles in Labeo rohita. NANOMATERIALS 2019; 9:nano9020309. [PMID: 30823536 PMCID: PMC6409703 DOI: 10.3390/nano9020309] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/20/2019] [Revised: 02/09/2019] [Accepted: 02/14/2019] [Indexed: 12/12/2022]
Abstract
In the present in vivo study, we provide a comparison of toxicological consequences induced by four different types of spherical nanoparticles (NPs)—silver nanoparticles (AgNPs, 40 ± 6 nm), nickel (NiNPs, 43 ± 6 nm), cobalt oxide (Co3O4NPs, 60 ± 6 nm), and chromium oxide (Cr3O4NPs, 50 ± 5 nm)—on freshwater fish Labeo rohita. Fish were exposed to NPs (25 mg/L) for 21 days. We observed a NPs type-dependent toxicity in fish. An altered behavior showing signs of stress and a substantial reduction in total leukocyte count was noticed in all NP-treated groups. A low total erythrocyte count in all NP-treated fish except for Co3O4NPs was discerned while a low survival rate in the case of Cr3O4NP-treated fish was observed. A significant decrease in growth and hemoglobin were noticed in NiNP- and Cr3O4NP-treated fish. A considerable total protein elevation was detected in NiNP-, Co3O4NP-, and Cr3O4NP-treated groups. An upgrading in albumin level was witnessed in Co3O4NP- and Cr3O4NP-treated groups while a high level of globulin was noted in NiNP- and Co3O4NP-exposed groups. In all NP-treated groups, a depleted activity of antioxidative enzymes and pathological lesions in liver and kidney were noticed.
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Affiliation(s)
- Zakia Kanwal
- Department of Zoology, Faculty of Natural Science, Lahore College for Women University, Jail Road Lahore 54000, Pakistan.
| | - Muhammad Akram Raza
- Centre of Excellence in Solid State Physics, University of the Punjab, Quaid-e-Azam Campus, Lahore 54590, Pakistan.
| | - Farkhanda Manzoor
- Department of Zoology, Faculty of Natural Science, Lahore College for Women University, Jail Road Lahore 54000, Pakistan.
| | - Saira Riaz
- Centre of Excellence in Solid State Physics, University of the Punjab, Quaid-e-Azam Campus, Lahore 54590, Pakistan.
| | - Ghazala Jabeen
- Department of Zoology, Faculty of Natural Science, Lahore College for Women University, Jail Road Lahore 54000, Pakistan.
| | - Shafaq Fatima
- Department of Zoology, Faculty of Natural Science, Lahore College for Women University, Jail Road Lahore 54000, Pakistan.
| | - Shahzad Naseem
- Centre of Excellence in Solid State Physics, University of the Punjab, Quaid-e-Azam Campus, Lahore 54590, Pakistan.
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57
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Amidation of fatty acid methyl ester using metal oxides and hydroxides as catalysts. CHEMICAL PAPERS 2019. [DOI: 10.1007/s11696-019-00706-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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58
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Fernández E, Rivero-Crespo MA, Domínguez I, Rubio-Marqués P, Oliver-Meseguer J, Liu L, Cabrero-Antonino M, Gavara R, Hernández-Garrido JC, Boronat M, Leyva-Pérez A, Corma A. Base-Controlled Heck, Suzuki, and Sonogashira Reactions Catalyzed by Ligand-Free Platinum or Palladium Single Atom and Sub-Nanometer Clusters. J Am Chem Soc 2019; 141:1928-1940. [DOI: 10.1021/jacs.8b07884] [Citation(s) in RCA: 78] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Estefanía Fernández
- Instituto de Tecnología Química (UPV-CSIC), Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Avda. de los Naranjos s/n, 46022 Valencia, Spain
| | - Miguel A. Rivero-Crespo
- Instituto de Tecnología Química (UPV-CSIC), Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Avda. de los Naranjos s/n, 46022 Valencia, Spain
| | - Irene Domínguez
- Packaging Lab, Instituto de Agroquímica y Tecnología de Alimentos, IATA-CSIC, Av. Agustín Escardino 7, 46980 Paterna, València, Spain
| | - Paula Rubio-Marqués
- Instituto de Tecnología Química (UPV-CSIC), Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Avda. de los Naranjos s/n, 46022 Valencia, Spain
| | - Judit Oliver-Meseguer
- Instituto de Tecnología Química (UPV-CSIC), Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Avda. de los Naranjos s/n, 46022 Valencia, Spain
| | - Lichen Liu
- Instituto de Tecnología Química (UPV-CSIC), Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Avda. de los Naranjos s/n, 46022 Valencia, Spain
| | - María Cabrero-Antonino
- Instituto de Tecnología Química (UPV-CSIC), Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Avda. de los Naranjos s/n, 46022 Valencia, Spain
| | - Rafael Gavara
- Packaging Lab, Instituto de Agroquímica y Tecnología de Alimentos, IATA-CSIC, Av. Agustín Escardino 7, 46980 Paterna, València, Spain
| | - Juan C. Hernández-Garrido
- Departamento de Ciencia de Materiales e Ingeniería Metalúrgica y Química Inorgánica, Universidad de Cádiz, Campus Río San Pedro, 11510 Puerto Real, Cádiz, Spain
| | - Mercedes Boronat
- Instituto de Tecnología Química (UPV-CSIC), Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Avda. de los Naranjos s/n, 46022 Valencia, Spain
| | - Antonio Leyva-Pérez
- Instituto de Tecnología Química (UPV-CSIC), Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Avda. de los Naranjos s/n, 46022 Valencia, Spain
| | - Avelino Corma
- Instituto de Tecnología Química (UPV-CSIC), Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Avda. de los Naranjos s/n, 46022 Valencia, Spain
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59
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Ibrahim M, Wei MM, Deydier E, Manoury E, Poli R, Lecante P, Philippot K. Rhodium nanoparticles stabilized by ferrocenyl-phosphine ligands: synthesis and catalytic styrene hydrogenation. Dalton Trans 2019; 48:6777-6786. [PMID: 31020979 DOI: 10.1039/c9dt01006h] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
A series of ferrocenylphosphine-stabilized rhodium nanoparticles has been prepared in one pot from the organometallic [Rh(η3-C3H5)3] precursor. This complex has been decomposed by hydrogen treatment (3 bar) in dichloromethane in the presence of five different ferrocene-based phosphine ligands. Very small rhodium nanoparticles in the size range of 1.1-1.7 nm have been obtained. These nanoparticles have shown activity in a model catalytic reaction, namely the hydrogenation of styrene. These results evidence that the metal surface is not blocked despite the steric bulk of the stabilizing ligands. Moreover, certain selectivity has been observed depending on the ligand employed. To the best of our knowledge, such a type of compound has not yet been used for stabilizing metal nanoparticles and our findings highlight the interest to do so.
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Affiliation(s)
- M Ibrahim
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205, route de Narbonne, BP 44099, F-31077 Toulouse Cedex 4, France.
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60
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Lu Y, Wang J, Yu L, Kovarik L, Zhang X, Hoffman AS, Gallo A, Bare SR, Sokaras D, Kroll T, Dagle V, Xin H, Karim AM. Identification of the active complex for CO oxidation over single-atom Ir-on-MgAl2O4 catalysts. Nat Catal 2018. [DOI: 10.1038/s41929-018-0192-4] [Citation(s) in RCA: 164] [Impact Index Per Article: 27.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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61
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Li W, Ivanov S, Mozaffari S, Shanaiah N, Karim AM. Palladium Acetate Trimer: Understanding Its Ligand-Induced Dissociation Thermochemistry Using Isothermal Titration Calorimetry, X-ray Absorption Fine Structure, and 31P Nuclear Magnetic Resonance. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00787] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
| | - Sergei Ivanov
- Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
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62
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Mondloch J, Özkar S, Finke RG. "Weakly Ligated, Labile Ligand" Nanoparticles: The Case of Ir(0) n ·(H +Cl -) m. ACS OMEGA 2018; 3:14538-14550. [PMID: 31458138 PMCID: PMC6643726 DOI: 10.1021/acsomega.8b01569] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2018] [Accepted: 09/27/2018] [Indexed: 06/10/2023]
Abstract
It is of considerable interest to prepare weakly ligated, labile ligand (WLLL) nanoparticles for applications in areas such as chemical catalysis. WLLL nanoparticles can be defined as nanoparticles with sufficient, albeit minimal, surface ligands of moderate binding strength to meta-stabilize nanoparticles, initial stabilizer ligands that can be readily replaced by other, desired, more strongly coordinating ligands and removed completely when desired. Herein, we describe WLLL nanoparticles prepared from [Ir(1,5-COD)Cl]2 reduction under H2, in acetone. The results suggest that H+Cl--stabilized Ir(0) n nanoparticles, herein Ir(0) n ·(H+Cl-) a , serve as a WLLL nanoparticle for the preparation of, as illustrative examples, five specific nanoparticle products: Ir(0) n ·(Cl-Bu3NH+) a , Ir(0) n ·(Cl-Dodec3NH+) a , Ir(0) n ·(POct3)0.2n (Cl-H+) b , Ir(0) n ·(POct3)0.2n , and the γ-Al2O3-supported heterogeneous catalyst, Ir(0) n ·(γ-Al2O3) a (Cl-H+) b . (where a and b vary for the differently ligated nanoparticles; in addition, solvent can be present as a nanoparticle surface ligand). With added POct3 as a key, prototype example, an important feature is that a minimum, desired, experimentally determinable amount of ligand (e.g., just 0.2 equiv POct3 per mole of Ir) can be added, which is shown to provide sufficient stabilization that the resultant Ir(0) n ·(POct3)0.2n (Cl-H+) b is isolable. Additionally, the initial labile ligand stabilizer HCl can be removed to yield Ir(0) n ·(POct3)0.2n that is >99% free of Cl- by a AgCl precipitation test. The results provide strong support for the weakly ligated, labile ligand nanoparticle concept and specific support for Ir(0) n ·(H+Cl-) a as a WLLL nanoparticle.
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Affiliation(s)
- Joseph
E. Mondloch
- Department
of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Saim Özkar
- Department
of Chemistry, Middle East Technical University, 06800 Ankara, Turkey
| | - Richard G. Finke
- Department
of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
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63
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Jahandideh H, Ganjeh-Anzabi P, Bryant SL, Trifkovic M. The Significance of Graphene Oxide-Polyacrylamide Interactions on the Stability and Microstructure of Oil-in-Water Emulsions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:12870-12881. [PMID: 30266070 DOI: 10.1021/acs.langmuir.8b02288] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The emulsification of oil in water by nanoparticles can be facilitated by the addition of costabilizers, such as polymers and surfactants. The enhanced properties of the resulting emulsions are usually attributed to nanoparticle/costabilizer synergy; however, the mechanism of this synergistic effect and its impacts on emulsion stability and microstructure remain unclear. Here, we study the synergistic interaction of graphene oxide (GO) and a high molecular weight anionic polyacrylamide (PAM) in stabilization of paraffin oil/water emulsion systems. We show that the addition of PAM reduces the amount of GO required to stabilize an emulsion significantly. In order to probe the synergistic effect of GO and PAM, we analytically analyze the oil-free GO and GO-PAM dispersions and directly image their morphology via Cryo-TEM and atomic force microscopy (AFM). X-ray diffraction results confirm the adsorption of PAM molecules onto GO sheets resulting in the formation of ultimate GO-PAM complexes. The adsorption phenomenon is a consequence of hydrogen bonding and acid-base interactions, conceivably leading to a resilient electron-donor-acceptor complex. The microstructure of emulsions is captured with two-color fluorescent microscopy and Cryo-TEM. The acquired images display the localization of GO-PAM complexes at the interface while large amount of GO-PAM flocs coexist at the interface and in between oil droplets. Localization of such complexes and flocs at the interface is found to be responsible for their slow creaming rates compared to their GO counterparts. Mechanical properties of both dispersions and emulsions are studied by shear rheology. Rheological measurements confirm that GO-PAM complexes have a higher desorption energy from the interface resulting in higher critical shear strain of GO-PAM emulsions. The results, with insights into both structure and rheology, form a foundational understanding for integration of other polymers and nanoparticles in emulsion systems, which enables efficient design of these systems for an application of interest.
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Affiliation(s)
- Heidi Jahandideh
- Department of Chemical and Petroleum Engineering , University of Calgary , 2500 University Drive N.W. , Calgary , Canada
| | - Pejman Ganjeh-Anzabi
- Department of Chemical and Petroleum Engineering , University of Calgary , 2500 University Drive N.W. , Calgary , Canada
| | - Steven L Bryant
- Department of Chemical and Petroleum Engineering , University of Calgary , 2500 University Drive N.W. , Calgary , Canada
| | - Milana Trifkovic
- Department of Chemical and Petroleum Engineering , University of Calgary , 2500 University Drive N.W. , Calgary , Canada
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Mathew BB, Biju VG, Nideghatta Beeregowda K. Accumulation of lead (Pb II) metal ions by Bacillus toyonensis SCE1 species, innate to industrial-area ground water and nanoparticle synthesis. APPLIED NANOSCIENCE 2018. [DOI: 10.1007/s13204-018-0892-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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65
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Mohanta K, Attia Attia Y, Buceta D, Pérez-Mariño ÁM, Blanco Varela MC, López-Quintela MA, Rivas J. Electrochemical study of UV erosion of Au nanorods by silver nanoclusters (NCs) allows the construction of a NC-sensitized photovoltaic cell. APPLIED NANOSCIENCE 2018. [DOI: 10.1007/s13204-018-0840-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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66
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Sánchez-Segura L, Ochoa-Alejo N, Carriles R, Zavala-García LE. Development of bovine serum albumin–capsaicin nanoparticles for biotechnological applications. APPLIED NANOSCIENCE 2018. [DOI: 10.1007/s13204-018-0874-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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67
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Zhang J, Xie H, Shen Y, Zhao W, Li Y. Facile synthesis of highly monodisperse EuSe nanocubes with size-dependent optical/magnetic properties and their electrochemiluminescence performance. NANOSCALE 2018; 10:13617-13625. [PMID: 29979461 DOI: 10.1039/c8nr02500b] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We reported a facile and robust method for the synthesis of highly monodisperse EuSe nanocubes (EuSe NCs) with controllable edge lengths in the range of 8-70 nm. The EuSe NCs were formed through the aggregation of EuSe small particles (cores) and then their surface reconstruction under the influence of 1-dodecanethiol (DDT) that acted as a capping surfactant. DDT was not only found to be critical to the nucleation temperature of preparing EuSe NCs, but also played a decisive role in the formation of structurally well-defined nanocubes. The results indicated that the remarkable monodispersity and high shape consistency of EuSe NCs were highly controlled by the change in the DDT concentration. Furthermore, the size-dependent optical/magnetic properties based on the quantum size effect and the influence of edge lengths of EuSe NCs were also investigated and discussed. More importantly, the electrochemiluminescence (ECL) performance of EuSe NCs was first reported. This will make possible more biomedical applications in future.
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Affiliation(s)
- Jinzha Zhang
- National and Local Joint Engineering Research Center of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, P. R. China.
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68
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Ali S, Orell O, Kanerva M, Hannula SP. Effect of Morphology and Crystal Structure on the Thermal Conductivity of Titania Nanotubes. NANOSCALE RESEARCH LETTERS 2018; 13:212. [PMID: 30014264 PMCID: PMC6047950 DOI: 10.1186/s11671-018-2613-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Accepted: 06/25/2018] [Indexed: 06/08/2023]
Abstract
Titania nanotubes (TNTs) with different morphology and crystal structure are prepared by chemical processing and rapid breakdown anodization (RBA) methods. The nanotubes are studied in terms of thermal conductivity. The TNTs with variable wall thickness below 30 nm have significantly reduced thermal conductivity than bulk titania, due to the phonon confinement, smaller phonon mean free path, and enhanced phonon boundary scattering. The amorphous nanotubes (TNTAmor) have comparatively thicker walls than both crystalline nanotubes. The TNTAmor has a thermal conductivity of 0.98 W m-1 K-1, which is slightly less than the thermal conductivity of crystalline anatase nanotubes (TNTA; 1.07 W m-1 K-1). However, the titania nanotubes with mixed structure (TNTA,T) and the smallest dimensions have the lowest thermal conductivity of 0.75 W m-1 K-1, probably due to the phonon confinement. The experimental results are compared with the theoretical study considering the size confinement effect with different wall dimensions of TNTs and surface scattering. The results agree well with the surface roughness factor (p) of 0.26 for TNTA,T, 0.18 for TNTA, and 0.65 for TNTAmor, indicating diffusive phonon scattering and rougher surfaces for TNTA. Interestingly, the present results together with those presented in literature suggest that thermal conductivity reduction with respect to the wall thickness occurs also for the amorphous nanotubes. This is ascribed to the role of propagons in the thermal transport of disordered structures.
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Affiliation(s)
- Saima Ali
- Department of Chemistry and Materials Science, Aalto University School of Chemical Engineering, P.O. Box 16100, FI-00076 Espoo, Finland
| | - Olli Orell
- Laboratory of Materials Science, Tampere University of Technology, P.O. Box 589, FI-33101 Tampere, Finland
| | - Mikko Kanerva
- Laboratory of Materials Science, Tampere University of Technology, P.O. Box 589, FI-33101 Tampere, Finland
| | - Simo-Pekka Hannula
- Department of Chemistry and Materials Science, Aalto University School of Chemical Engineering, P.O. Box 16100, FI-00076 Espoo, Finland
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69
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Decoration of mesoporous graphite-like C3N4 nanosheets by NiS nanoparticle-driven visible light for hydrogen evolution. APPLIED NANOSCIENCE 2018. [DOI: 10.1007/s13204-018-0835-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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70
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Mozaffari S, Li W, Thompson C, Ivanov S, Seifert S, Lee B, Kovarik L, Karim AM. Ligand-Mediated Nucleation and Growth of Palladium Metal Nanoparticles. J Vis Exp 2018. [PMID: 29985367 DOI: 10.3791/57667] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
The size, size distribution and stability of colloidal nanoparticles are greatly affected by the presence of capping ligands. Despite the key contribution of capping ligands during the synthesis reaction, their role in regulating the nucleation and growth rates of colloidal nanoparticles is not well understood. In this work, we demonstrate a mechanistic investigation of the role of trioctylphosphine (TOP) in Pd nanoparticles in different solvents (toluene and pyridine) using in situ SAXS and ligand-based kinetic modeling. Our results under different synthetic conditions reveal the overlap of nucleation and growth of Pd nanoparticles during the reaction, which contradicts the LaMer-type nucleation and growth model. The model accounts for the kinetics of Pd-TOP binding for both, the precursor and the particle surface, which is essential to capture the size evolution as well as the concentration of particles in situ. In addition, we illustrate the predictive power of our ligand-based model through designing the synthetic conditions to obtain nanoparticles with desired sizes. The proposed methodology can be applied to other synthesis systems and therefore serves as an effective strategy for predictive synthesis of colloidal nanoparticles.
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Affiliation(s)
- Saeed Mozaffari
- Department of Chemical Engineering, Virginia Polytechnic Institute and State University
| | - Wenhui Li
- Department of Chemical Engineering, Virginia Polytechnic Institute and State University
| | - Coogan Thompson
- Department of Chemical Engineering, Virginia Polytechnic Institute and State University
| | - Sergei Ivanov
- Center for Integrated Nanotechnologies, Los Alamos National Laboratory
| | | | - Byeongdu Lee
- X-ray Science Division, Argonne National Laboratory
| | - Libor Kovarik
- Environmental Molecular Science Laboratory, Pacific Northwest National Laboratory
| | - Ayman M Karim
- Department of Chemical Engineering, Virginia Polytechnic Institute and State University;
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71
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Grillo F, Van Bui H, La Zara D, Aarnink AAI, Kovalgin AY, Kooyman P, Kreutzer MT, van Ommen JR. From Single Atoms to Nanoparticles: Autocatalysis and Metal Aggregation in Atomic Layer Deposition of Pt on TiO 2 Nanopowder. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2018; 14:e1800765. [PMID: 29745008 DOI: 10.1002/smll.201800765] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2018] [Revised: 03/25/2018] [Indexed: 05/29/2023]
Abstract
A fundamental understanding of the interplay between ligand-removal kinetics and metal aggregation during the formation of platinum nanoparticles (NPs) in atomic layer deposition of Pt on TiO2 nanopowder using trimethyl(methylcyclo-pentadienyl)platinum(IV) as the precursor and O2 as the coreactant is presented. The growth follows a pathway from single atoms to NPs as a function of the oxygen exposure (PO2 × time). The growth kinetics is modeled by accounting for the autocatalytic combustion of the precursor ligands via a variant of the Finke-Watzky two-step model. Even at relatively high oxygen exposures (<120 mbar s) little to no Pt is deposited after the first cycle and most of the Pt is atomically dispersed. Increasing the oxygen exposure above 120 mbar s results in a rapid increase in the Pt loading, which saturates at exposures >> 120 mbar s. The deposition of more Pt leads to the formation of NPs that can be as large as 6 nm. Crucially, high PO2 (≥5 mbar) hinders metal aggregation, thus leading to narrow particle size distributions. The results show that ALD of Pt NPs is reproducible across small and large surface areas if the precursor ligands are removed at high PO2 .
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Affiliation(s)
- Fabio Grillo
- Department of Chemical Engineering, Delft University of Technology, 2629 HZ, Delft, The Netherlands
| | - Hao Van Bui
- Department of Chemical Engineering, Delft University of Technology, 2629 HZ, Delft, The Netherlands
| | - Damiano La Zara
- Department of Chemical Engineering, Delft University of Technology, 2629 HZ, Delft, The Netherlands
| | - Antonius A I Aarnink
- MESA+ Institute for Nanotechnology, University of Twente, 7500 AE, Enschede, The Netherlands
| | - Alexey Y Kovalgin
- MESA+ Institute for Nanotechnology, University of Twente, 7500 AE, Enschede, The Netherlands
| | - Patricia Kooyman
- Department of Chemical Engineering, University of Cape Town, 7701, Cape Town, South Africa
| | - Michiel T Kreutzer
- Department of Chemical Engineering, Delft University of Technology, 2629 HZ, Delft, The Netherlands
| | - Jan Rudolf van Ommen
- Department of Chemical Engineering, Delft University of Technology, 2629 HZ, Delft, The Netherlands
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72
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Sapkota R, Zou J, Dawka S, Bobak JE, Papadopoulos C. Multi-functional thin film coatings formed via nanogrinding. APPLIED NANOSCIENCE 2018. [DOI: 10.1007/s13204-018-0812-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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73
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Menon NG, Tatiparti SSV, Mukherji S. Effect of calcination temperature on the microstructure and electronic properties of TiO2–ZnO nanocomposites and implications on photocatalytic activity. APPLIED NANOSCIENCE 2018. [DOI: 10.1007/s13204-018-0783-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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74
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Lazzari S, Theiler PM, Shen Y, Coley CW, Stemmer A, Jensen KF. Ligand-Mediated Nanocrystal Growth. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:3307-3315. [PMID: 29429346 DOI: 10.1021/acs.langmuir.8b00076] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
A microfluidic platform combined with a deterministic model accounting for surface ligands reveals precious insights into the nanocrystal formation process. The comparison of on-line kinetic information with model predictions enables the derivation of temperature-dependent kinetic parameters for the CdSe model system. This fully generalizable approach represents a step forward toward a quantitative prediction of the nanocrystal size distribution, enabling the control and optimization of process performance and material properties.
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Affiliation(s)
- Stefano Lazzari
- Department of Chemical Engineering , MIT , 77 Massachusetts Avenue , Cambridge , Massachusetts 02139 , United States
| | - Pius M Theiler
- Department of Chemical Engineering , MIT , 77 Massachusetts Avenue , Cambridge , Massachusetts 02139 , United States
- Nanotechnology Group , ETH Zurich , Säumerstrasse 4 , Rüschlikon 8803 , Switzerland
| | - Yi Shen
- Department of Chemical Engineering , MIT , 77 Massachusetts Avenue , Cambridge , Massachusetts 02139 , United States
| | - Connor W Coley
- Department of Chemical Engineering , MIT , 77 Massachusetts Avenue , Cambridge , Massachusetts 02139 , United States
| | - Andreas Stemmer
- Nanotechnology Group , ETH Zurich , Säumerstrasse 4 , Rüschlikon 8803 , Switzerland
| | - Klavs F Jensen
- Department of Chemical Engineering , MIT , 77 Massachusetts Avenue , Cambridge , Massachusetts 02139 , United States
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