The Experts below are selected from a list of 5634 Experts worldwide ranked by ideXlab platform
Remi Beaulac - One of the best experts on this subject based on the ideXlab platform.
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conversion mechanism of soluble alkylamide precursors for the Synthesis of colloidal nitride Nanomaterials
Journal of the American Chemical Society, 2018Co-Authors: Yang Chen, Nathan T Landes, Daniel J Little, Remi BeaulacAbstract:There are few molecular precursors that chemically convert to nitride Nanomaterials, which severely limits the development of this important class of materials. Alkylamides are soluble and stable nitride precursors that can be based on the same primary amines that are often used in colloidal Nanomaterial Synthesis, but their conversion involves the breaking of stable C–N bonds through a mechanism that remained unknown up to now. A critical aspect of this conversion mechanism is uncovered here, involving a prelimary step whereby alkylamides are oxidized to N-alkylimines to yield NH2– amide species that are postulated to be the actual reactive precursors in the formation of indium nitride Nanomaterials. Interestingly, this step also involves the concomitant reduction of indium(III) to In(0) nanodroplets, which consequently catalyze the growth of InN Nanomaterials. The elucidation of the origin of the surprising reactivity of otherwise stable molecular precursors opens the door to the development of new solu...
Jesus Santamaria - One of the best experts on this subject based on the ideXlab platform.
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scaled up production of plasmonic nanoparticles using microfluidics from metal precursors to functionalized and sterilized nanoparticles
Lab on a Chip, 2014Co-Authors: Leyre Gomez, Victo Sebastia, Silvia Irusta, Alfonso Ibarra, Manuel Arruebo, Jesus SantamariaAbstract:An exquisite control of Synthesis parameters is generally required in Nanomaterial Synthesis to guarantee consistency in the essential characteristics such as size and shape. On the other hand, reliable scaled-up production of Nanomaterials is required in order to achieve the production rates required for emerging nanotechnology applications while delivering a consistent product with the intended characteristics, avoiding the traditional batch-to-batch deviations. The continuous production of Nanomaterials is challenging because of the difficulties involved in translating the complexity of Nanomaterial Synthesis into on-line operations. In this regard, microfluidic platforms stand out over conventional batch reactors due to their superior performance, easy scalability and reliability. Here, a continuous, scaled-up Synthesis of high quality plasmonic hollow gold nanoparticles is reported for the first time. Not only was the throughput significantly higher than in a batch reactor, but also the microfluidic system allowed the on-line implementation of two new stages in Nanomaterial production: surface functionalization and sterilization.
Marc R Knecht - One of the best experts on this subject based on the ideXlab platform.
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comparative study of materials binding peptide interactions with gold and silver surfaces and nanostructures a thermodynamic basis for biological selectivity of inorganic materials
Chemistry of Materials, 2014Co-Authors: Pablo J Palafoxhernandez, Zhenghua Tang, Zak E Hughes, Yue Li, Mark T Swihart, Paras N Prasad, Tiffany R Walsh, Marc R KnechtAbstract:Controllable 3D assembly of multicomponent inorganic Nanomaterials by precisely positioning two or more types of nanoparticles to modulate their interactions and achieve multifunctionality remains a major challenge. The diverse chemical and structural features of biomolecules can generate the compositionally specific organic/inorganic interactions needed to create such assemblies. Toward this aim, we studied the materials-specific binding of peptides selected based upon affinity for Ag (AgBP1 and AgBP2) and Au (AuBP1 and AuBP2) surfaces, combining experimental binding measurements, advanced molecular simulation, and Nanomaterial Synthesis. This reveals, for the first time, different modes of binding on the chemically similar Au and Ag surfaces. Molecular simulations showed flatter configurations on Au and a greater variety of 3D adsorbed conformations on Ag, reflecting primarily enthalpically driven binding on Au and entropically driven binding on Ag. This may arise from differences in the interfacial sol...
Yang Chen - One of the best experts on this subject based on the ideXlab platform.
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conversion mechanism of soluble alkylamide precursors for the Synthesis of colloidal nitride Nanomaterials
Journal of the American Chemical Society, 2018Co-Authors: Yang Chen, Nathan T Landes, Daniel J Little, Remi BeaulacAbstract:There are few molecular precursors that chemically convert to nitride Nanomaterials, which severely limits the development of this important class of materials. Alkylamides are soluble and stable nitride precursors that can be based on the same primary amines that are often used in colloidal Nanomaterial Synthesis, but their conversion involves the breaking of stable C–N bonds through a mechanism that remained unknown up to now. A critical aspect of this conversion mechanism is uncovered here, involving a prelimary step whereby alkylamides are oxidized to N-alkylimines to yield NH2– amide species that are postulated to be the actual reactive precursors in the formation of indium nitride Nanomaterials. Interestingly, this step also involves the concomitant reduction of indium(III) to In(0) nanodroplets, which consequently catalyze the growth of InN Nanomaterials. The elucidation of the origin of the surprising reactivity of otherwise stable molecular precursors opens the door to the development of new solu...
Volker Hessel - One of the best experts on this subject based on the ideXlab platform.
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Carbon Nanosheets Synthesis in a Gliding Arc Reactor: On the Reaction Routes and Process Parameters
Plasma Chemistry and Plasma Processing, 2020Co-Authors: Xintong Ma, Volker Hessel, Sirui Li, Rohit Chaudhary, Fausto GallucciAbstract:Non-thermal plasma is a promising technology for high purity Nanomaterial Synthesis in a fast, flexible and controllable process. Gliding arc discharge, as one of the most efficient non-thermal plasmas, has been widely used in gas treatment but rarely studied for the Nanomaterial Synthesis. In this study, a comparison study for carbon nanosheets Synthesis including toluene dissociation and graphite exfoliation was investigated in a 2D gliding arc reactor at atmospheric pressure. The effects of gas flow rate, precursor concentration and power input on the structures of carbon nanosheets produced through the two Synthesis routes were explored and compared. Amorphous carbon nanosheets were produced in both approaches with a few crystalline structures formation in the case of toluene dissociation. The thickness of carbon nanosheets synthesized from graphite exfoliation was less than 3 nm, which was thinner and more uniform than that from toluene dissociation. The flow rate of carrier gas has direct influence on the morphology of carbon Nanomaterials in the case of toluene dissociation. Carbon spheres were also produced along with nanosheets when the flow rate decreased from 2 to 0.5 L/min. However, in the case of graphite exfoliation, only carbon nanosheets were observed regardless of the change in flow rate of the carrier gas. The generated chemical species and plasma gas temperatures were measured and estimated for the mechanism study, respectively.
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Synthesis of yttrium oxide nanoparticles via a facile microplasma assisted process
Chemical Engineering Science, 2018Co-Authors: Liangliang Lin, Sergey A Starostin, Saif A Khan, Volker HesselAbstract:Abstract Plasma electrochemistry is an emerging technique for Nanomaterial Synthesis. The present study reports the preparation of yttrium oxide nanoparticles via a simple, environmentally benign, microplasma-assisted process operated in pin-to-liquid configuration under ambient atmospheric conditions using yttrium nitrate aqueous solution as the precursor. The plasma-liquid interaction was monitored in-situ by optical emission spectroscopy. The morphology, structure and chemical composition of the obtained products were examined by complementary analytical methods. It was demonstrated that high purity crystalline Y2O3 nanoparticles with adjustable sizes can be fabricated via a two-step method: plasma electrodeposition of yttrium hydroxide followed by heat-treatment at various temperatures. A microplasma array design was proposed for the process upscaling towards industrial level production. Moreover, possible mechanisms for plasma-assisted yttrium hydroxide precipitation were discussed by correlating optical emission spectroscopic studies, plasma kinetic analysis and the precipitation equilibrium. As a proof-of-concept, this process offers a facile, environmental friendly and scalable route for rare-earth oxide Nanomaterial Synthesis.
