Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"alloy nanoparticles"”.
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Gold And Silver Alloy Nanoparticles: Synthesis, Characterization And Atomic Structure
… medicine, catalysis and energy. Gold nanoparticles are nanomaterials that have less than 100 nm at least in one dimension. The composition and the structure/geometry of the nanoparticles determine the chemical properties and reactivity. Modern research focus on method development in …
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Designing Core/Alloy Nanoparticles by Manipulation of Interfacial Oxidation and Atomic Diffusion
<p>Alloying presents a unique opportunity to combine the chemical and physical properties of two or more metals into one material. This phenomenon can also be used for multi-metallic nanoparticles (NPs), where in conjunction with the size effects induced by quantum confinement, new properties or …
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Synthesis and characterization of magnetically hard Fe-Pt alloy nanoparticles and nano-islands
… we explored the fabrication of FePt nanoparticles and nano-islands with the face-centered tetragonal (fct, L10) phase prepared by both chemical synthesis routes and physical vapor deposition. Microstructure and magnetic properties characterizations were used to gain a fundamental …
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Influence of alloy metal nanoparticles on the fluorescence properties of a ruthenium complex
<p>Silver and gold alloy nanoparticles were synthesized using starch as the protective agent and glucose as the mild reducing agent. The absorbance spectra of Au/Ag alloy nanoparticles showed that the glucose system resulted in the formation of stable nanoparticles. The present study investigates …
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DESIGN AND SYNTHESIS OF STAINLESS-STEEL NANOPARTICLES: OXIDATION BEHAVIOR AND MORPHOLOGICAL EVOLUTION
… in heterostructured transition metal-based core/alloy nanostructures and to design protocol towards the synthesis of oxidation resistant stainless-steel nanoparticles. To this effect, I employed bottom-up wet chemistry approach to synthesize multi-shell Fe/CrxNi1-x NPs, bimetallic FexCr1-x alloy …
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Application and Performance of High Entropy Metal Nanoparticles in the Field of Antibacterial
… a new method for synthesizing high-entropy alloy oxide nanoparticles (HEO NPs), which is expected to possess the advantages of multiple metals while retaining the antibacterial properties of metals themselves. We tested the antibacterial properties of different phase alloy nanoparticles and …
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Chemiluminescent reactions catalyzed by nanoparticles of gold, silver, and gold/silver alloys
… (CL) reactions are catalyzed by metals nanoparticles, which display unique catalytic properties due to an increased surface area. The present study describes the catalytic effects of nanoparticles (NP) of silver, gold, and alloys of Au/Ag nanoparticles on the chemiluminescent reaction …
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Selective growth of magnetic nanoparticles in domains of block copolymer films, and in polyelectrolyte multilayers
… cobalt, iron, iron-cobalt, and cobalt-nickel alloy nanoparticles, some of which exhibit significant room-temperature magnetic coercivity, have been produced by thermal decomposition of organometallic complexes in a bulk film of P(S-b-2VP). The particles are patterned on the nanoscale: they …
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A novel mechanism for metal alloying at the nanoscale
… We propose a novel mechanism for metal alloying at the nanoscale, which provides a general route for alloying dissimilar elements into single-phase solid-solution nanoparticles, referred to as high-entropy-alloy nanoparticles (HEA-NPs). To validate the theory, we developed a facile …
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Structural characterization of multimetallic nanoparticles
<p>Bimetallic and trimetallic alloy nanoparticles have enhanced catalytic activities due to their unique structural properties. Using <em>in situ</em> time-resolved synchrotron based x-ray diffraction, we investigated the structural properties of nanoscale catalysts undergoing various heat …
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Plasmonic hot carrier-driven electrochemistry
… including systems based on plasmonic metal nanoparticles. To take advantage of these materials, a fundamental understanding of how plasmon-induced hot-carriers drive chemical reactions is needed. This work examines how different hot carrier distributions affect electrochemical reactions of …
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Enhancement of Platinum Cathode Catalysis by Addition of Transition Metals
… black, as-received unsupported commercial Pt3Co alloy nanoparticles, acid-treated Pt3Co (Pt3Co-at), and Mo-modified Pt 3Co nanoparticles (Pt3Co/Mo). The addition of Mo to the Pt 3Co nanoparticles was confirmed by XPS and electrochemical data. Adding Mo to Pt3Co nanoparticles does not alter the …
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Multimodal in-situ spectroscopy of novel enzyme mimics with optofluidic microreactors
… (Flaponite) and the synthesis of silver and gold alloy nanoparticles (Ag-AuNP) for plasmon-enhanced photocatalysis. Flaponite demonstrated superior recyclability compared to RTA alone, allowing for the repeated degradation of the harmful azo dye pollutant amaranth in water. Both surfactant and …
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Experimental Studies on Nucleation, Nanoparticle's Formation and Polymerization from the Vapor Phase
… TFE vapor on laser-vaporized magnesium nanoparticles has been studied under different experimental conditions, such as the supersaturation, the pressure and the electric field. In part II, the laser vaporization controlled condensation (LVCC) technique was used to prepare Au-Ag alloy …
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Elemental and structural behaviors of bimetallic nanoparticles under reactive environments and its implication in catalyst design, processing, and performance
… of Ag-Pt compositional intermetallics from alloy nanoparticles for formic acid oxidation (FAOR), and the regioselective atomic rearrangement of Ag-Pt octahedral catalysts by chemical vapor-assisted treatment. The second part is dedicated to identifying the actual structures of the bimetallic …
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Image Processing Methods For Dual-Energy Contrast-Enhanced X-Ray Breast Imaging
… and evaluation of numerous silver based nanoparticles for DE imaging was explored and imaged. Silica-encapsulated silver nanoparticles, gold-silver alloy nanoparticles, an “all-in-one” silver sulfide nanoparticle, and silver telluride nanoparticles were imaged in phantoms and mice using …
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HIGH TEMPERATURE NANOMANUFACTURING FOR EMERGING TECHNOLOGIES
… in-situ synthesis of ultrasmall, well-dispersed nanoparticles. Metal salts decompose rapidly at high temperatures and nucleate into well-dispersed nanoparticles during the rapid cooling (rate of ~10E5 K/s). By varying the composition in salt mixtures, we synthesized bimetallic, multimetallic and …
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Synthesis and Characterization of Platinum-Based Fuel Cell Catalysts
… by spontaneous deposition of Ru onto platinum nanoparticles. Their reactivity toward methanol oxidation maximized at ruthenium packing density 0.4--0.5, displaying twice the activity of the commercial Pt-Ru alloy catalyst. COs adsorbed on these Pt/Ru nanoparticle consisted of two domains: CO on …
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A combined electrochemical and x-ray photoelectron spectroscopic approach to electrocatalysis
… systems. As a starting point, commercial Pt/Ru alloy nanoparticles of different compositions were investigated as catalysts for the electrooxidation of methanol and formic acid. In the course of the study of electrooxidation of methanol, it was found to be very difficult, if not impossible, to …
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Synthesis and characterization of metal chalcogenide nanostructured materials for thermoelectric applications
… PbTe and Bi⊂2⊂Te⊂3⊂ (Bi⊂2⊂Te⊂3⊂–Sb⊂2⊂Te⊂3⊂ alloys) were selected as these are well established TE materials in bulk form. The approaches used for nanostructuring are (1) sol-gel assembly of discrete nanoparticles of PbTe, Bi⊂2⊂Te⊂3⊂, and Bi⊂2⊂Te⊂3⊂–⊂2⊂Te⊂3⊂ alloys, and (2) formation of …
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