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Littérature scientifique sur le sujet « Shape controlled synthesis »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 11 septembre 2023

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Articles de revues sur le sujet "Shape controlled synthesis"

Xia, Younan, Xiaohu Xia, Yi Wang et Shuifen Xie. « Shape-controlled synthesis of metal nanocrystals ». MRS Bulletin 38, n^o 4 (avril 2013) : 335–44. http://dx.doi.org/10.1557/mrs.2013.84.

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Sun, Jialin, Jianhong Zhang, Wei Liu, Sheng Liu, Hongsan Sun, Kaili Jiang, Qunqing Li et Jihua Guo. « Shape-controlled synthesis of silver nanostructures ». Nanotechnology 16, n^o 10 (2 septembre 2005) : 2412–14. http://dx.doi.org/10.1088/0957-4484/16/10/070.

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Jang, Hee-Jeong, Soonchang Hong et Sungho Park. « Shape-controlled synthesis of Pt nanoframes ». Journal of Materials Chemistry 22, n^o 37 (2012) : 19792. http://dx.doi.org/10.1039/c2jm34187e.

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YU, MING, XIANGJU DIAO, TAO HUANG, HANFAN LIU et JINLIN LI. « SHAPE-CONTROLLED SYNTHESIS OF RUTHENIUM NANOPARTICLES ». Functional Materials Letters 04, n^o 04 (décembre 2011) : 337–40. http://dx.doi.org/10.1142/s1793604711002214.

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Uniform pompon-like Ru nanoparticles with an average diameter of 148 nm were readily synthesized by reducing RuCl 3 with triethylene glycol (TG) as both a reducing agent and a solvent in the presence of PVP by oil-bath heating at 170°C for 6 h. The as-prepared Ru nano-pompons were characterized by TEM, XRD, XPS and UV-vis absorption spectroscopy. The effects of some parameters such as the average molecular weight and the concentration of PVP on the synthesis of Ru nano-pompons were investigated.

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Lin, Hua, Shijie He, Zhou Mao, Jie Miao, Meng Xu et Qing Li. « Shape-controlled synthesis of vanadium diselenide ». Nanotechnology 28, n^o 44 (12 octobre 2017) : 445603. http://dx.doi.org/10.1088/1361-6528/aa882c.

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Wang, Debao, Caixia Song et Zhengshui Hu. « Shape-controlled synthesis of ZnO architectures ». Crystal Research and Technology 43, n^o 1 (janvier 2008) : 55–60. http://dx.doi.org/10.1002/crat.200710991.

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Zeng, Hao, Philip M. Rice, Shan X. Wang et Shouheng Sun. « Shape-Controlled Synthesis and Shape-Induced Texture of MnFe2O4Nanoparticles ». Journal of the American Chemical Society 126, n^o 37 (septembre 2004) : 11458–59. http://dx.doi.org/10.1021/ja045911d.

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Wang, Z. L., T. S. Ahmadi, J. M. Petroski et M. A. El-Sayed. « Surface Structures of Shape-Controlled Platinum Nanoparticles ». Microscopy and Microanalysis 3, S2 (août 1997) : 429–30. http://dx.doi.org/10.1017/s143192760000903x.

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The selectivity and activities of platinum (Pt) particles strongly depend on their sizes and shapes. A technique has been recently reported for controlling the shapes and sizes of Pt particles [1]. Pt particles were prepared by bubbling Ar gas through the solution of K2PtCl4, and the Pt ions were reduced by flowing H2 gas through the solution. The shape control was performed by changing the ratio of the concentration of the capping polymer material to that of the platinum cations used in the reductive synthesis of colloidal particles in solution at room temperature [2]. High percentage of cubic, tetrahedral and octahedral particles have been prepared at room temperature, making it possible for studying the chemical activities of particles with different shapes and facets. This paper aims to study the surface structures of Pt particles prepared by the shape-controlling synthesis technique using high-resolution transmission electron microscopy (HRTEM).

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Ahmadi, T. S., Z. L. Wang, T. C. Green, A. Henglein et M. A. El-Sayed. « Shape-Controlled Synthesis of Colloidal Platinum Nanoparticles ». Science 272, n^o 5270 (28 juin 1996) : 1924–25. http://dx.doi.org/10.1126/science.272.5270.1924.

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Wang, Ruigang, et Randi Dangerfield. « Seed-mediated synthesis of shape-controlled CeO2nanocrystals ». RSC Adv. 4, n^o 7 (2014) : 3615–20. http://dx.doi.org/10.1039/c3ra44495c.

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Thèses sur le sujet "Shape controlled synthesis"

Ayres, Benjamin Robert. « Use of Soybean Lecithin in Shape Controlled Synthesis of Gold Nanoparticles ». PDXScholar, 2013. https://pdxscholar.library.pdx.edu/open_access_etds/628.

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The work presented in this dissertation is a composite of experiments in the growth of gold nanoparticles with specific optical properties of interest. The goal is to synthesize these gold nanoparticles using soybean extract for not only shape control, but for propensity as a biocompatible delivery system. The optical properties of these nanoparticles has found great application in coloring glass during the Roman empire and, over the centuries, has grown into its own research field in applications of nanoparticulate materials. Many of the current functions include use in biological systems as biosensors and therapeutic applications, thus making biocompatibility a necessity. Current use of cetyltrimethylammonium bromide leads to rod-shaped gold nanoparticles, however, the stability of these gold nanoparticles does not endure for extended periods of time in aqueous media. In my research, two important components were found to be necessary for stable, anisotropic growth of gold nanoparticles. In the first experiments, it was found that bromide played a key role in shape control. Bromide exchange on the gold atoms led to specific packing of the growing crystals, allowing for two-dimensional growth of gold nanoparticles. It was also discerned that soybean lecithin contained ligands that blocked specific gold facets leading to prismatic gold nanoparticle growth. These gold nanoprisms give a near infrared plasmon absorption similar to that of rod-shaped gold nanoparticles. These gold nanoprisms are discovered to be extremely stable in aqueous media and remain soluble for extended periods of time, far longer than that of gold nanoparticles grown using cetyltrimethylammonium bromide. Since soy lecithin has a plethora of compounds present, it became necessary to discover which compound was responsible for the shape control of the gold nanoprisms in order to optimize the synthesis and allow for a maximum yield of the gold nanoprisms. Many of these components were identified by high performance liquid chromatography and liquid chromatography-mass spectrometry. However, re-spike of these components into growth solutions did not enhance the growth of gold nanoprisms. Upon separating the shapes of the gold nanoparticles using gel electrophoresis, addition of KCN to the separated gold nanoparticles allowed us to extract the culpable ligands for shape control. Analysis of these ligands by mass spectrometry elucidated the identity of PA and upon re-spike of the PA into a growth solution of PC95, the growth of a near-infrared plasmon absorption was seen. The stability of these gold nanoparticles was tested with and without the addition of decane thiol and it was concluded that addition of the thiol allowed for improved stability of the gold nanoparticles towards cyanide. It was determined that at a concentration of 2 μM decanethiol, spherical gold nanoparticles remained stable to cyanide at the expense of the prismatic gold nanoparticles. However, at 5 μM decanethiol, both spherical and prismatic gold nanoparticles retained stability to cyanide in aqueous conditions.

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Mutinda, Samuel I. « Hydrothermal Synthesis of Shape/Size-Controlled Cerium-Based Oxides ». Youngstown State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1378917332.

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ZHU, SHUN. « SYNTHESIS OF SIZE, STRUCTURE AND SHAPE CONTROLLED IRON BASED MAGNETIC NANOMATERIALS ». Case Western Reserve University School of Graduate Studies / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=case1322920113.

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BERETTA, MARIO. « Nanostructured mesoporous materials obtained by template synthesis and controlled shape replica ». Doctoral thesis, Università degli Studi di Milano-Bicocca, 2009. http://hdl.handle.net/10281/7502.

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Mesoporous nanostructured materials are useful for a widespread field of applications, such as gas storage; selective molecular adsorption; confined chemical reactions and catalysis. In this work, periodic mesoporous silica and organosilica materials, thanks to their high surface area, narrow pore size distribution and high regular structure, have been exploited to obtain nanostructured porous materials with different chemical nature, such as polymer or carbon. Periodic mesoporous silica objects with defined micrometric shape have been obtained by template synthesis in aqueous medium. A change in synthesis condition of temperature, time and acidity leads to the generation of different shapes such as gyroids, spheres and hollow tubes. Mesoporous silica particles have been exploited for confined polymerization of different monomers (styrene, methylmethacrylate and acrylonitrile) to obtain morphological polymeric nanocomposites. The nanocomposite with polyacrylonitrile has been then heated at high temperature in non-oxidative atmosphere to induce polymer carbonization until the formation of a graphitic-like carbon structure. The silica matrix has been then removed by chemical etching to obtain nanostructured porous materials in polymer and graphitic-like carbon with high surface area and the same micrometric morphology of starting silica matrix (shape replica effect). Afterwards, a periodic mesoporous organosilica system, with phenylene groups directly linked in the wall structure and organized on the molecular scale, has been synthesised, exploited as selective gas adsorption system and heated in non-oxidative atmosphere to obtain a new mesoporous carbon material with high surface area, very regular mesoporous structure and graphitic-like pore walls. Characterization of these materials has been conduced with X-ray diffraction, calorimetric techniques (DSC and TGA), adsorption of gases and vapours and advanced mono- and bi-dimensional NMR experiments to investigate the interaction between the organic and the inorganic moieties. Thermal evolutions of polyacrylonitrile and phenylene-organosilica have been studied with spectroscopic techniques of ATR and Raman, while the shape replica effect and the high regular pore structure have been directly seen with SEM and TEM microscopies.

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Rai, A. « Size and shape controlled synthesis of metal nanoparticles and its nanocomposites ». Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2007. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/2543.

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Song, Qing. « Size and Shape Controlled Synthesis and Superparamagnetic Properties of Spinel Ferrites Nanocrystals ». Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7645.

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Size and Shape Controlled Synthesis and Superparamagnetic Properties of Spinel Ferrites Nanocrystals Qing Song 216 pages Directed by Dr. Z. John Zhang The correlationship between magnetic properties and magnetic couplings is established through the investigations of various cubic spinel ferrite nanocrystals. The results of this thesis contribute to the knowledge of size and shape controlled synthesis of various spinel ferrites and core shell architectured nanocrystals as well as the nanomagnetism in spinel ferrites by systematically investigating the effects of spin orbital coupling, magnetocrystalline anisotropy, exchange coupling, shape and surface anisotropy upon superparamagnetic properties of spinel ferrite nanocrystals. A general synthetic method is developed for size and shape control of metal oxide nanocrystals. The size and shape dependent superparamagnetic properties are discussed. The relationship between spin orbital coupling and magnetocrystalline anisotropy is studied comparatively on variable sizes of spherical CoFe2O4 and Fe3O4 nanocrystals. It also addresses the effect of exchange coupling between magnetic hard phase and soft phase upon magnetic properties in core shell structured spinel ferrite nanocrystals. The role of anisotropic shapes of nanocrystals upon self assembled orientation ordered superstructures are investigated. The effect of thermal stability of molecular precursors upon size controlled synthesis of MnFe2O4 nanocrystals and the size dependent superparamagnetic properties are described.

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Naskar, Suraj [Verfasser]. « Synthesis and characterization of aerogels from shape controlled metal and semiconductor nanocrystals / Suraj Naskar ». Hannover : Technische Informationsbibliothek (TIB), 2017. http://d-nb.info/1136091092/34.

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Nguyen, Thanh Dinh. « Metal oxide, Mixed oxide, and hybrid metal@oxide nanocrystals : size-and shape-controlled synthesis and catalytic applications ». Thesis, Université Laval, 2011. http://www.theses.ulaval.ca/2011/28408/28408.pdf.

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Le contrôle de la taille et de la morphologie de nanocristaux d’oxydes métalliques simples, d’oxydes mixtes et d’oxydes métalliques hybrides est un sujet de grand intérêt. La dépendance de leur propriétés physio-chimiques avec leurs taille et morphologies, génèrent une variété de leur applications dans plusieurs domaines. Cependant, le dévellopement des nanocristaux en controllant la taille, la forme, l’assemblage et l’homogénéité de la composition chimique pour l’optimisation de propriété spécifiques demandent la combinaison de nombreux parametres de synthèse. Les trois différentes approches ont été développées dans le cadre de la thèse pour la synthèse d’une variété de nouveaux nanomatériaux d’oxydes simples, d’oxydes mixtes et d’oxydes métalliques hybrides dont la taille et la forme ont été bien controllées. Ces méthodes ont été nommées comme des méthodes solvo-hydrothermiques assistées par des molécules structurantes à l’état monophasique (eau ou eau/éthanol) et à l’état biphasique (eau-toluène). Nos approches de synthèse ont permi de préparer des nanocristaux des oxydes de métaux de transition (V, Cr, Mn, Co, Ni, In), et des terres rares (Sm, Ce, La, Gd, Er, Ti, Y, Zr), ainsi que des oxydes métalliques mixtes (tungstate, orthovanadate, molybdate). Ces nanomatériaux sont sous forme colloïdale mono-dispersée qui présente une cristallinité élevée. La taille et la forme de tels nanocristaux peuvent facilement être contrôlées par une simple variation des paramètres de synthèse telle que la concentration de précurseurs, la nature de la molécule structurante, la température et le temps de réaction. A large variété de techniques a été utilisée pour la caracterisation de ces nanomatériaux telles que TEM/HRTEM, SEM, SAED, EDS, XRD, XPS, FTIR, TGA-DTA, UV-vis, photoluminescence, BET. Les propriétés catalytiques de ces matériaux ont aussi été étudiées. Dans ce travail, le contrôle de la cinétique de croissance des nucléides ainsi que le mécanisme gouvernant la forme qui conduit à la taille et la morphologie finale du nanocrystal ont été proposé. L’effet de la taille et de la forme des nanoparticules d’oxyde métallique hybrides sur les propriétés catalytiques pour la réaction d’oxydation du CO et la photo-dégradation du bleue de méthylène a été aussi étudié. Car les catalyseurs existant actuellement à base de métaux nobles sont très couteux et en plus très sensibles à l’empoisonnement par le gas H2S ou les émissions polluantes de SOx. L’activité catalytique des nanocristaux d’oxydes métallique hybrides Cu@CeO2 de formes cubiques dans l’oxydation de CO et de Ag@TiO2 de formes de ceinture dans la photo dégradation du bleue de méthylène ont montré la dépendance de la taille et la forme des nanocristaux avec leur propriétés catalytiques.
The ability to finely control the size and shape of metal oxide, mixed metal oxide, hybrid metal/oxide nanocrystals has become an area of great interest, as many of their physical and chemical properties are highly dependent on morphology, and the more technological applications will be possible for their use. Large-scale synthesis of such high-quality nanocrystals is the first and key step to this area of science. A tremendous effort has recently been spent in attempt to control these novel properties through manipulation of size, shape, structure, and composition. Flexibly nanocrystal size/shape control for both monodisperse single and multiple-oxide nanomaterial systems, however, remains largely empirical and still presents a great challenge. In this dissertation, new synthetic approaches have been developed and described for the synthetic design of a series of colloidal monodisperse metal oxide, mixed metal oxide, hybrid metal-oxide nanocrystals with controlled size and shape. These materials were generally characterized using TEM/HRTEM, SEM, SAED, EDS, XRD, XPS, FTIR, TGA-DTA, UV-vis, photoluminescence, BET techniques. Effect of the size and shape of these obtained hybrid metal-oxide nanocrystals on the catalytic properties is illustrated. We have developed three different new surfactant-assistant pathways for the large-scale synthesis of three types of nanomaterials including metal oxide, mixed metal oxide, hybrid noble-metal-oxide colloidal monodisperse nanocrystals. Namely, the solvo-hydrothermal surfactant-assisted methods in one-phase (water or water/ethanol) and two-phase (water-toluene) systems were used for the synthesis of metal oxide (transition metal-V, Cr, Mn, Co, Ni, In and rare earth-Sm, Ce, La, Gd, Er, Ti, Y, Zr) and mixed metal oxide (tungstate, orthovanadate, molybdate). The seed-media growth with the assistant of bifunctional surfactant was used for the synthesis of hybrid noble metal@oxide (Ag@TiO2, (Cu or Ag)@CeO2, Au/tungstate, Ag/molybdate, etc.) nanocrystals. A significant feature of our synthetic approaches was pointed out that most resulting nanocrystal products are monodisperse, high crystallinity, uniform shape, and narrow distribution. The size and shape of such nanocrystals can be controlled easily by simple tuning the reaction parameters such as the concentration of precursors and surfactants, the nature of surfactant, the temperature and time of synthetic reaction. The prepared nanocrystals with the functional surface were used as the building blocks for the self-assembly into hierarchical mesocrystal microspheres. The effective ways how to control the growth kinetics of the nuclei and the shape-guiding mechanisms leading to the manipulation of morphology of final products were proposed. Our current approaches have several conveniences including used nontoxic and inexpensive reagents (most using inorganic metal salts as starting precursors instead of expensive and toxic metallic alkoxides or organometallics), relatively mild conditions, high-yield, and large-scale production; in some causes, water or ethanol was used as environmentally benign reaction solvent. Catalytic activity and selectivity are governed by the nature of the catalyst surface, making shaped nanocrystals ideal substrates for understanding the influence of surface structure on heterogeneous catalysis at the nanoscale. Finally, this work was concentrated on demonstration of heterogeneous catalytic activity of hybrid metal-oxide nanomaterials (Cu@CeO2, Ag@TiO2) as a typical example. We synthesized the high-crystalline titanium oxide and cerium oxide nanocrystals with control over their shape and surface chemistry in high yield via the aqueous surfactant-assist method. The novel hybrid metal-oxide nanocrystals were produced by the depositing noble metal ion (Cu, Ag, Au) precursors on the pre-synthesized oxide seeds via seed-mediated growth. The catalytic activity of these metal-oxide nanohybrids of Cu@CeO2 nanocubes for CO oxidation conversion and Ag@TiO2 nanobelts for Methylene Blue photodegradation with size/shape-dependent properties were verified.

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Nguyen, Thanh-Dinh. « Metal oxide, Mixed oxide, and hybrid metal@oxide nanocrystals : size-and shape-controlled synthesis and catalytic applications ». Doctoral thesis, Université Laval, 2011. http://hdl.handle.net/20.500.11794/22994.

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Pham, Minh-Hao. « Nanoscale Metal—Organic Frameworks : Synthesis and Application of Bimodal Micro/Meso-Structure and Nanocrystals with Controlled Size and Shape ». Thesis, Université Laval, 2013. http://www.theses.ulaval.ca/2013/30124/30124.pdf.

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Les composés à réseau moléculaire organo-métalliques (MOFs) ont émergé comme de nouvelles classes de matériaux hybrides organo-inorganiques avec des potentialités significatives en séparation, stockage de gaz, catalyse et support de médicaments. Ces matériaux sont formés par un processus d’assemblage dans lequel les ions métalliques sont liés entre eux via un ligand organique, ce qui génère une surface de l’ordre de 6500 m2g−1 et des volumes de pores supérieurs à 4.3 cm3g−1. Dans cette thèse trois différentes approches ont été développées pour la synthèse des nanocristaux MOFs à deux modes micro-mésoporeux, ainsi que des nanocristaux MOFs à taille et forme contrôlable. En plus, ces nanocristaux MOFs ont été utilisé comme un agent structurant pour la synthèse de nanocomposite hybride platine-oxyde de titane (metal-oxide-TiO2-PtOx) qui ont été utilisé comme photocatalyseurs pour la production d’hydrogène à partir de l’eau sous la lumière visible. Dans ce travail: (i) La première approche implique une méthode utilisant un surfactant, suivi de traitement solvo-thermale en présence d’acide acétique pour former des nanocristaux MOFs micro-mésoporeux. L’utilisation de surfactant non-ionique tell que F127 (EO97PO69EO97) pour induire une structure mésoporeuse provoque labilité de la cristallisation du mur des pores de la structure MOF. Tandis que la présence de l’acide acétique contrôle la vitesse de cristallisation du réseau MOFs pour former une mésostructure bien définie à l’intérieur des nanocristaux MOFs. En utilisant cette approche des nanocristaux de [Cu3(BTC)2] et [Cu2(HBTB)2] de structure mésoporeuse avec des diamètres de pores autour de 4.0 nm et des micropores intrinsèques ont été synthétisés. (ii) La méthodologie de modulation de la coordination a été développée pour contrôler la forme et la taille des nanocristaux MOFs. Des nanocubes et nanofeuilles de [Cu2(ndc)2(dabco)]n de la structure MOFs ont été synthétisés en utilisant simultanément l’acide acétique et la pyridine ou la pyridine uniquement, respectivement comme modulateurs sélectifs. Ces nanocristaux MOFs possèdent une cristallinité élevée et une grande capacité d’adsorption. La morphologie a été aussi étudiée en fonction de la capacité d’adsorption de CO2. (iii) La synthèse hydrothermale en contrôlant la taille de nanocristaux de carboxylates de structure MOFs, en utilisant simultanément des réactifs stabilisants et des réactifs contrôlant la déprotonation a été démontrée. Dans le cas de Fe-MIL-88B-NH2, la molécule triblock copolymer a été utilisée comme un réactif stabilisant en coordonnant avec le métal et contrôlant la croissance en formant des nanocristaux. L’acide acétique joue le rôle comme un agent déprotonant des liants carboxyliques en variant sa concentration dans le milieu réactionnel, ainsi il régule la vitesse de nucléation, conduisant à aussi contrôler la taille ainsi que le rapport longueur/largeur des nanocristaux. (iv) Finalement, des nanocomposites hybrides Fe2O3-TiO2-PtOx de forme creuse possédant l’activité photocatalytique performante ont été développés en utilisant des nanocristaux Fe-MIL-88B composés de centres Fe3(μ3-O) liés par coordination insaturée comme template solide. Ce type de nanocomposites non seulement absorbe la lumière visible mais aussi améliore la séparation des électrons et des trous photo-générés, due à l’épaisseur de paroi mince et les deux co-catalyseurs (Fe2O3 and PtOx) localisés sur deux opposites surfaces du creux. En conséquence, l'efficacité en photocatalyse de ce type de nanocomposites est élevée pour la production d'H2 à partir de l'eau sous la lumière visible.
Metal-organic frameworks (MOFs) have emerged as an important new class of porous inorganic-organic hybrid solids with the potential for a significant impact on separation, gas storage, catalysis and biomedicine. These materials are formed by assembly process in which metal ions are linked together by rigid organic ligands, which creates enormous surface areas (up to 6500 m2g−1) and high pore volumes (up to 4.3 cm3g−1). In this thesis, three different synthetic approaches have been developed to achieve bimodal micro/mesoporous MOF nanocrystals as well as nanosized MOFs with controlled size and shape. In addition, using the synthesized MOF nanocrystals as templates, a new hollow hybrid metal-oxide-TiO2-PtOx nanocomposite has also been prepared, and used as the visible-light driven photocatalyst for the hydrogen production from water. In this work, (i) the first approach involves nonionic surfactant-templated solvothermal synthesis in the presence of acetic acid toward hierarchically micro-mesoporous MOF nanocrystals. The use of a nonionic surfactant such as F127 (EO97PO69EO97) as mesostructure template induces the ability to crystallize a MOF structure of pore wall, while the presence of acetic acid allows control of the crystallization rate of the framework to form well-defined mesostructures within the crystalline MOF nanocrystals. Using this approach, [Cu3(BTC)2] and [Cu2(HBTB)2]-based MOF nanocrystals containing mesopores with diameter around 4.0 nm and intrinsic micropores have been successfully synthesized. (ii) Secondly, the coordination modulation methodology has been developed to control shape and size of MOF crystals at the nanoscale. Nanocubes and nanosheets of [Cu2(ndc)2(dabco)]n MOF have been rationally synthesized by using simultaneously acetic acid and pyridine or only pyridine, respectively, as selective modulators. These MOF nanocrystals exhibit high crystallinity and high CO2 sorption capacity. Their morphology-dependent CO2 sorption property has also been demonstrated. (iii) Thirdly, the size-controlled hydrothermal synthesis of uniform carboxylate-based MOF nanocrystals using simultaneously stabilizing reagent and deprotonation-controlled reagent has been demonstrated. In case of Fe-MIL-88B-NH2, the molecular triblock copolymers as stabilizing reagents coordinate with the metal ions and thus stabilize nuclei, which suppress the crystal growth to form nanocrystals. Acetic acid as deprotonation-controlled reagent adjusts the deprotonation of the carboxylic linker via varying its concentration in the reaction mixture, and thus regulates the rate of nucleation, leading to tailoring the size and aspect ratio (length/width) of the nanocrystals. (iv) Finally, a new hollow hybrid metal-oxide-TiO2-PtOx nanocomposite as an efficient photocatalyst has been developed by using iron-based MIL-88B nanocrystals consisting of coordinatively unsaturated Fe3(μ3-O) clusters as template. The hollow nanocomposite not only absorbs visible light, but also enhances the separation between photogenerated electrons and holes because of its thin wall and the surface separation of two distinct functional cocatalysts (Fe2O3 and PtOx) on two different surface sides of the hollow. As a result, the efficient photoactivity of the nanocomposite photocatalysts has been found for the H2 production from water under visible light irradiation.

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Livres sur le sujet "Shape controlled synthesis"

Zhang, Ya-Wen. Bimetallic Nanostructures : Shape-Controlled Synthesis for Catalysis, Plasmonics, and Sensing Applications. Wiley & Sons, Limited, John, 2018.

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Zhang, Ya-Wen. Bimetallic Nanostructures : Shape-Controlled Synthesis for Catalysis, Plasmonics, and Sensing Applications. Wiley & Sons, Incorporated, John, 2018.

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Zhang, Ya-Wen. Bimetallic Nanostructures : Shape-Controlled Synthesis for Catalysis, Plasmonics, and Sensing Applications. Wiley & Sons, Incorporated, John, 2018.

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Zhang, Ya-Wen. Bimetallic Nanostructures : Shape-Controlled Synthesis for Catalysis, Plasmonics and Sensing Applications. Wiley & Sons, Limited, John, 2018.

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Chapitres de livres sur le sujet "Shape controlled synthesis"

Ko, Wen-Yin, et Kuan-Jiuh Lin. « Shape-Controlled Synthesis of Copper Nanoparticles ». Dans Complex-Shaped Metal Nanoparticles, 167–82. Weinheim, Germany : Wiley-VCH Verlag GmbH & Co. KGaA, 2012. http://dx.doi.org/10.1002/9783527652570.ch4.

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Yang, Yaodong, Wenwei Ge, Shashank Priya, Yu U. Wang, Jie-Fang Li et D. Viehland. « Controlled Shape Synthesis of BaTiO3 -(Mn0.5 Zn0.5 )Fe2 O4 Nanocomposites ». Dans Ceramic Transactions Series, 295–300. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470930991.ch28.

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Zhang, Yawen, et Jun Gu. « Shape-Controlled Bimetallic Nanocatalysts in Fuel Cells : Synthesis and Electrocatalytic Studies ». Dans Current Trends of Surface Science and Catalysis, 121–42. New York, NY : Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-8742-5_6.

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Puntes, Victor F., Paul Alivisatos et Kannan M. Krishnan. « Synthesis of Passivated Cobalt Nanocrystal Arrays With Controlled Size and Shape ». Dans Magnetic Storage Systems Beyond 2000, 381–84. Dordrecht : Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-010-0624-8_32.

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Hunyadi Murph, Simona E., Steven M. Serkiz, Elise B. Fox, Hector Colon-Mercado, Lindsay Sexton et Matthew Siegfried. « Synthesis, Functionalization, Characterization, and Application of Controlled Shape Nanoparticles in Energy Production ». Dans ACS Symposium Series, 127–63. Washington, DC : American Chemical Society, 2011. http://dx.doi.org/10.1021/bk-2011-1064.ch008.

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Tian, Na, Yu-Hua Wen, Zhi-You Zhou et Shi-Gang Sun. « Shape-Controlled Synthesis of Metal Nanoparticles of High Surface Energy and Their Applications in Electrocatalysis ». Dans Complex-Shaped Metal Nanoparticles, 117–65. Weinheim, Germany : Wiley-VCH Verlag GmbH & Co. KGaA, 2012. http://dx.doi.org/10.1002/9783527652570.ch3.

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Kaneko, Masahide, Atsushi Koike et Yoshinori Hatori. « Automatic Synthesis of Moving Facial Images with Expression and Mouth Shape Controlled by Text ». Dans Visual Computing, 57–75. Tokyo : Springer Japan, 1992. http://dx.doi.org/10.1007/978-4-431-68204-2_5.

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Bharathi, S., D. Nataraj, K. Senthil et Yoshitake Masuda. « Shape-controlled synthesis of α-Fe2O3 nanostructures : engineering their surface properties for improved photocatalytic degradation efficiency ». Dans Nanotechnology for Sustainable Development, 113–25. Cham : Springer International Publishing, 2012. http://dx.doi.org/10.1007/978-3-319-05041-6_9.

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Cozzoli, P. Davide, et Liberato Manna. « Synthetic Strategies to Size and Shape Controlled Nanocrystals and Nanocrystal Heterostructures ». Dans Bio-Applications of Nanoparticles, 1–17. New York, NY : Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-76713-0_1.

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Yang, Yaodong, Shashank Priya, Jie-Fang Li et D. Viehland. « Large-Scale (>1GM) Synthesis of Single Grain Two-Phase BaTiO3 -Mn0.5 Zn0.5 Fe2 O4 Nano-Composites with Controlled Shapes ». Dans Ceramic Transactions Series, 23–29. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2009. http://dx.doi.org/10.1002/9780470551523.ch3.

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Actes de conférences sur le sujet "Shape controlled synthesis"

Ramanathan, Rajesh, Anthony O'Mullane, Peter M. Smooker, Suresh K. Bhargava et Vipul Bansal. « Biological shape-controlled synthesis of silver nanoplates ». Dans 2010 International Conference on Nanoscience and Nanotechnology (ICONN). IEEE, 2010. http://dx.doi.org/10.1109/iconn.2010.6045227.

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Verma, Manoj, Annu Dahiya Kathy et P. Senthil Kumar. « Metal precursor induced shape controlled synthesis of gold nanostructures ». Dans 2ND INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5032560.

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Sang, Rongli, Hengyong Wei et Yuzhu Zhang. « Size, shape-controlled Synthesis of BaSiF6 nanostructures in a hydrothermal process ». Dans 2015 International Conference on Materials, Environmental and Biological Engineering. Paris, France : Atlantis Press, 2015. http://dx.doi.org/10.2991/mebe-15.2015.245.

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Xie, Jianping. « Green Process for Shape- and Size-controlled Synthesis of Metal Nanomaterials ». Dans 14th Asia Pacific Confederation of Chemical Engineering Congress. Singapore : Research Publishing Services, 2012. http://dx.doi.org/10.3850/978-981-07-1445-1_639.

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Wacker, J. B., V. K. Parashar et M. A. M. Gijs. « On-chip synthesis of silica nanoparticle assemblies with controlled shape and size ». Dans TRANSDUCERS 2011 - 2011 16th International Solid-State Sensors, Actuators and Microsystems Conference. IEEE, 2011. http://dx.doi.org/10.1109/transducers.2011.5969409.

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Prabhakaran, G., et Ramaswamy Murugan. « Shape controlled synthesis of Cu[sub 2]O microcrystals and their structural and optical properties ». Dans SOLID STATE PHYSICS : PROCEEDINGS OF THE 57TH DAE SOLID STATE PHYSICS SYMPOSIUM 2012. AIP, 2013. http://dx.doi.org/10.1063/1.4791498.

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Qiu, X. H., Q. Q. Bi, X. J. Li et Z. S. Xiong. « Shape-Controlled Synthesis of CeO2 Nanotube Using P123 Triblock Copolymer and Its Application in Catalytic Ozonation ». Dans International Conference on Computer Information Systems and Industrial Applications. Paris, France : Atlantis Press, 2015. http://dx.doi.org/10.2991/cisia-15.2015.125.

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Zhou, Hong, et Azher Hussain Naser Mohammed. « Compliant Mechanism Synthesis Using Degree of Genus and Variable Width Curves ». Dans ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-34514.

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Compliant mechanisms (CMs) utilize elastic deformations for mechanism functions. Their merits primarily come from jointless structures. The structure of a fully CM is a piece of elastic material and is defined by its topology, shape and size. Topology is the overarching material layout of a CM while shape and size are on its structural details, but topology is entangled with shape and size in the synthesis process of a CM because its elastic deformation is from the joint effect of topology, shape and size. Degree of freedom (DOF) and number of links used in rigid mechanism synthesis are not effective to guide the synthesis of CMs since any point of a fully CM can deform and its whole structure forms a single piece. Without effective synthesis guidance, the structural complexity of a synthesized CM can be undesirably high. In this paper, degree of genus (DOG) is introduced for topology guidance of CM synthesis. DOG of a CM is the number of holes and is actively controlled during its synthesis process. With DOG guidance, a synthesized CM will not have overcomplicated topology. Variable width curves (VWCs) are introduced in this paper for shape and size description. Any connection in a CM is defined as a VWC and the entire CM is modeled as a network of VWCs. With VWC description, a synthesized CM will not have unsmooth connection. Under DOG and VWC strategies, CM synthesis is systematized as optimizing control parameters of networks of VWCs. The proposed CM synthesis using DOG and VWC strategies is demonstrated by synthesizing shape morphing compliant mechanisms.

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Nessi, Andrea, et Tino Stanković. « Topology, Shape, and Size Optimization of Additively Manufactured Lattice Structures Based on the Superformula ». Dans ASME 2018 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/detc2018-86191.

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This paper investigates the application of Superformula for structural synthesis. The focus is set on the lightweight design of parts that can be realized using discrete lattice structures. While the design domain will be obtained using the Superformula, a tetrahedral meshing technique will be applied to this domain to generate the topology of the lattice structure. The motivation for this investigation stems from the property of the Superformula to easily represent complex biological shapes, which opens a possibility to directly link a structural synthesis to a biomimetic design. Currently, numerous results are being reported showing the development of a wide range of design methods and tools that first study and then utilize the solutions and principles from the nature to solve technical problems. However, none of these methods and tools quantitatively utilizes these principles in the form of nature inspired shapes that can be controlled parametrically. The motivation for this work is also in part due to the mathematical formulation of the Superformula as a generalization of a superellipse, which, in contrast to the normal surface modeling offers a very compact and easy way to handle set of rich shape variants with promising applications in structural synthesis. The structural synthesis approach is organized as a volume minimization using Simulated Annealing (SA) to search over the topology and shape of the lattice structure. The fitness of each of candidate solutions generated by SA is determined based on the outcome of lattice member sizing for which an Interior Point based method is applied. The approach is validated with a case study involving inline skate wheel spokes.

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Tai, Ming-Fong, Jong-Kai Hsiao, Hon-Man Liu, Shio-Chao Lee et Shin-Tai Chen. « Synthesis Fe-Ni Alloy Magnetic Nanoparticles for Biomedical Applications ». Dans ASME 2006 Multifunctional Nanocomposites International Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/mn2006-17041.

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In this investigation, we synthesize FeNi alloy magnetic nanoparticles (MNPs) by using both chemical precipitation and combustion methods. The FeNi MNPs prepared by combustion method have a rather high saturation magnetization Ms of ∼180 emu/g and a coercivity field Hc of near zero. The functionalized FeNi MNPs which were coated with biocompatible polyethyleneimine (PEI) polymer have also been synthesized. We demonstrated that the PEI coated FeNi MNPs can enter the mammalian cells in vitro and can be used as a magnetic resonance imagine (MRI) contrast agent. The results demonstrated that FeNi MNPs potentially could be applied in the biomedical field. To prepare a higher quality and well controlled Fe-Ni MNPs, we also developed a thermal reflux chemical precipitation method to synthesize FeNi3 alloy MNPs. The precursor chemicals of Fe(acac)3 and Ni(acac)2 in a molecular ratio of 1:3 reacted in octyl ether solvent at the boiling point of solvent (∼300°C) by the thermal reflux process. The 1,2-hexadecandiol and tri-n-octylphosphine oxide (TOPO) were used as reducer and surfactant, respectively. The chemically precipitated FeNi3 MNPs are well dispensed and have well-controlled particle sizes around 10–20 nm with a very narrow size distribution (± 1.2 nm). The highly monodispersive FeNi3 NPs present good uniformity in particle shape and crystallinity on particle surfaces. The MNPs exhibit well soft magnetism with saturation magnetization of ∼61 emu/g and Hc ∼ 0. The functionalized magnetic beads with biocompatible polymer coated on MNPs are also generated completed for biomedical applications.

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Rapports d'organisations sur le sujet "Shape controlled synthesis"

Ayres, Benjamin. Use of Soybean Lecithin in Shape Controlled Synthesis of Gold Nanoparticles. Portland State University Library, janvier 2000. http://dx.doi.org/10.15760/etd.628.

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Shelnutt, John Allen, Robert M. Garcia, Yujiang Song, Andres M. Moreno et Ronald J. Stanis. LDRD final report on synthesis of shape-and size-controlled platinum and platinum alloy nanostructures on carbon with improved durability. Office of Scientific and Technical Information (OSTI), octobre 2008. http://dx.doi.org/10.2172/966923.

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El-Sayed, M. A. The Reactivity and Dynamics of Gaseous Clusters. The Dynamics and Controlled Shaped Synthesis of Gaseous and Colloidal Nanoparticles. Fort Belvoir, VA : Defense Technical Information Center, octobre 1997. http://dx.doi.org/10.21236/ada330161.

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Willi, Joseph, Keith Stakes, Jack Regan et Robin Zevotek. Evaluation of Ventilation-Controlled Fires in L-Shaped Training Props. UL's Firefighter Safety Research Institute, octobre 2016. http://dx.doi.org/10.54206/102376/mijj9867.

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Investigations of recent firefighter line of duty deaths caused by rapid fire progression have highlighted a deficiency in firefighters’ understanding of how certain tactics affect the fire dynamics of ventilation-controlled fires. Many fires are in a ventilation-limited, decay state by the time firefighters arrive at the scene, meaning that introducing additional ventilation to the environment has the potential to cause rapid and intense fire growth. To more effectively teach firefighters about the potential effects of ventilation on a compartment fire, ventilation-controlled fires should be gener- ated during training. Safely creating such fires while maintaining compliance with NFPA 1403: Standard on Live-Fire Training Evolutions allows instructors to educate students on this important principle of fire dynamics in the training environment. Structures utilized for live-fire training have evolved from typical concrete burn buildings to now include smaller purpose-built props, like those constructed from steel shipping containers or wood and gypsum board. Such props have been embraced by organizations due to their cost-effectiveness and potential to improve fire behavior training. Obtaining a thorough understanding of the capa- bilities and limitations of such props is critical for instructors to convey accurate messages during training and properly prepare firefighters for scenarios they’ll encounter in the field. Experiments were conducted to quantify the fire environment in L-shaped props with different wall constructions. One prop had an interior wall lining of gypsum board over wood studs and fiberglass insulation. The two other props were constructed from metal shipping containers with corrugated steel walls; one had ceilings and walls comprised solely of the corrugated steel, while the other had ceilings and walls comprised of rolled steel sheeting over mineral wool insulation with the corrugated steel wall as its backing. Three fuel packages were compared between the props: one contained furnishings mainly composed of synthetic materials and foam plastics; another contained wooden pallets and straw; and the third contained wooden pallets, straw, and oriented strand board (OSB). A stochastic approach was used to compare data between replicate tests and quantify the repeatability of the different props and fuel packages, all of which were deemed sufficiently repeatable. Comparisons of data between the three props revealed that thermal conditions between experiments in the two metal props were indistinguishable, suggesting that the additional layer of insulation did not significantly alter the fire environment. Additionally, thermal conditions in the gypsum-lined prop were more severe than those in the metal props. The effects of ventilation changes on fire conditions were also analyzed across various prop and fuel load combinations. Lastly, the response of the thermal environment in each prop during interior suppression was evaluated, and the results implied that the thermal exposure to the firefighter was more severe in the metal props than the gypsum prop for a brief period following the start of suppression.

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Peter, J. M., et M. G. Gadd. Introduction to the volcanic- and sediment-hosted base-metal ore systems synthesis volume, with a summary of findings. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/328015.

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This volume presents results of research conducted during phase 5 of the Volcanic- and Sedimentary-hosted Base Metals Ore Systems project of the Geological Survey of Canada's Targeted Geoscience Initiative (TGI) program. The papers in this volume include syntheses and primary scientific reports. We present here a synopsis of the findings during this TGI project. Research activities have addressed several mineral deposit types hosted in sedimentary rocks: polymetallic hyper-enriched black shale, sedimentary exhalative Pb-Zn, carbonate-hosted Pb-Zn (Mississippi Valley-type; MVT), and fracture-controlled replacement Zn-Pb. Other carbonate-hosted deposits studied include a magnesite deposit at Mount Brussilof and a rare-earth element-F-Ba deposit at Rock Canyon Creek, both of which lack base metals but are spatially associated with the MVT deposits in the southern Rocky Mountains. Volcanogenic massive-sulfide deposits hosted in volcanic and mixed volcanic-sedimentary host rock settings were also examined. Through field geology, geochemical (lithogeochemistry, stable and radiogenic isotopes, fluid inclusions, and mineral chemistry), and geophysical (rock properties, magnetotelluric, and seismic) tools, the TGI research contributions have advanced genetic and exploration models for volcanic- and sedimentary-hosted base-metal deposits and developed new laboratory, geophysical, and field techniques to support exploration.

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