Bibliographies thématiques / Inorganic Nano-crystals

Littérature scientifique sur le sujet « Inorganic Nano-crystals »

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Publié le 7 septembre 2023

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Articles de revues sur le sujet "Inorganic Nano-crystals"

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Zheng, Kui, Tao Chen, Jian Zhang, Xiuquan Tian, Huilin Ge, Tiantao Qiao, Jia Lei, Xianyan Li, Tao Duan et Wenkun Zhu. « Nano-Montmorillonite Regulated Crystallization of Hierarchical Strontium Carbonate in a Microbial Mineralization System ». Materials 12, no 9 (29 avril 2019) : 1392. http://dx.doi.org/10.3390/ma12091392.

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In this paper, nano-montmorillonite (nano-MMT) was introduced into the microbial mineralization system of strontium carbonate (SrCO3). By changing the nano-MMT concentration and the mineralization time, the mechanism of mineralization was studied. SrCO3 superstructures with complex forms were acquired in the presence of nano-MMT as a crystal growth regulator. At low concentrations of nano-MMT, a cross-shaped SrCO3 superstructure was obtained. As the concentration increased, flower-like SrCO3 crystals formed via the dissolution and recrystallization processes. An emerging self-assembly process and crystal polymerization mechanism have been proposed by forming complex flower-like SrCO3 superstructures in high concentrations of nano-MMT. The above research indicated that unique bionic synthesis strategies in microbial systems could not only provide a useful route for the production of inorganic or inorganic/organic composites with a novel morphology and unique structure but also provide new ideas for the treatment of radionuclides.
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Alvarez, Ricardo, Philipp P. Nievergelt, Ekaterina Slyshkina, Peter Müller, Roger Alberto et Bernhard Spingler. « Single crystal growth of water-soluble metal complexes with the help of the nano-crystallization method ». Dalton Transactions 49, no 28 (2020) : 9632–40. http://dx.doi.org/10.1039/d0dt01236j.

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Liao, Jian Guo, Yu Bao Li, Li Zhang et Yi Zuo. « Study of Nano-Hydroxyapatite/Polycarbonate Composite for Bone Repair ». Materials Science Forum 620-622 (avril 2009) : 587–90. http://dx.doi.org/10.4028/www.scientific.net/msf.620-622.587.

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Acicular nano-hydroxyapatite (n-HA) was used to make a new biomaterial composite with polycarbonate by a novel technique. The physical and chemical characteristics of the composites were tested. It was found that the synthesized n-HA crystals were similar to bone apatite in size, phase composition and crystal structure. The TEM results indicated the biomimetic n-HA crystals were uniformly distributed in the polymer matrix. Chemical inter-action between inorganic n-HA and polycarbonate was investigated and discussed. These results indicate that the composite fulfills the basic requirement of bone substitute material, and has the potential for clinical applications.
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ZHAO, XU, XIUE REN, CONGTING SUN, XU ZHANG, YUNFEI SI, CHENGLIN YAN, JIASHENG XU et DONGFENG XUE. « MORPHOLOGY EVOLUTION AT NANO- TO MICRO-SCALE ». Functional Materials Letters 01, no 03 (décembre 2008) : 167–72. http://dx.doi.org/10.1142/s1793604708000393.

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Morphology evolution of inorganic/organic crystals during crystallization is a universal growth phenomenon. In this work, we have developed a capping agent-assisted strategy to clearly identify the whole process of morphology evolution in solution growth system. One kind of morphology evolution trend with three types of morphologies of cuprous oxide ( Cu 2 O ) was kinetically observed at varying the molar ratio of EDTA/ Cu (II) under three different pH values. Two kinds of morphology evolution trends of zinc oxide ( ZnO ) were also kinetically observed in the presence of H 2 O 2 and CH 3 COOH (HAc), respectively. Simulation results show that the morphology evolution of nano- to micro-scale crystals is strongly dependent on the bonding characteristics of a growth system. The present strategy positively explores the interesting principles of morphology evolution of functional materials, and can be widely extended to nano- to micro-scale devices research.
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Arai, Yusuke, Takenobu Suzuki, Yasutake Ohishi, Takao Tani et Shu Saeki. « Organic–Inorganic Hybrid Transparent Materials Containing Ni:MgO Nano-crystals for Gain Media ». Applied Physics Express 1 (31 octobre 2008) : 112501. http://dx.doi.org/10.1143/apex.1.112501.

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Srivastava, Bhupendra B., Santosh K. Gupta, Yang Li et Yuanbing Mao. « Bright persistent green emitting water-dispersible Zn2GeO4:Mn nanorods ». Dalton Transactions 49, no 22 (2020) : 7328–40. http://dx.doi.org/10.1039/d0dt00361a.

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This work reports on a green and facile approach for designing bright and persistent green luminescent Zn2GeO4:Mn2+ nano crystals with high quantum yield (∼52%) and water dispersibility designated for LEDs, security, and bio imaging.
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Zheng, Hua De, Ying Jun Wang, Chun Rong Yang, Xiao Feng Chen et Na Ru Zhao. « Investigation on the Porous Biomaterial for Bone Reconstruction with Addition of Bio-Mimetic Nano-Sized Inorganic Particles ». Key Engineering Materials 336-338 (avril 2007) : 1534–37. http://dx.doi.org/10.4028/www.scientific.net/kem.336-338.1534.

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The spherical nano-sized bioactive particles in the system of CaO-P2O5-SiO2 were bio-mimetically synthesized using micro-emulsion method. The microstructures and properties of the bio- mimetic nano-materials were characterized using XRD, FTIR, SEM/EDAX and TEM techniques. It was indicated that the nano-particles possessed glassy structural characteristics. The porous composite for bone tissue reconstruction was prepared by compounding poly (hydroxybutyrate-2-co-2-hydroxyvalerate) (PHBV) and the nano-particles of bio-mimetic bioactive glasses (BMBG). Bone-like hydroxyl- carbonate-apatite (HCA) could formed on the surface of porous composite by immersing the composite in simulated body fluid (SBF) at 37°C for 8 hours. With increase of immersion time, the morphology of HCA changed from spherical into flake-like crystals. The study on cells attachment of the porous PHBV/BMBG composite proved that the material possessed satisfactory bioactivity, bio-mineralization function and cells biocompatibility.
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Witika, Bwalya A., Vincent J. Smith et Roderick B. Walker. « Top-Down Synthesis of a Lamivudine-Zidovudine Nano Co-Crystal ». Crystals 11, no 1 (30 décembre 2020) : 33. http://dx.doi.org/10.3390/cryst11010033.

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Lamivudine (3TC) and zidovudine (AZT) are antiretroviral agents used to manage HIV/AIDS infection. A wet media milling top-down approach was used to develop and produce nano co-crystals of 3TC and AZT. Micro co-crystals were prepared by solvent evaporation and subsequently milled in the presence of two surfactants, viz., sodium lauryl sulfate (SLS) and α-tocopheryl polyethylene glycol succinate 1000 (TPGS 1000). Optimisation was undertaken using design of experiments (DoE) and response surface methodology (RSM) to establish and identify parameters that may affect the manufacturing of nano co-crystals. The impact of SLS and TPGS 1000 concentration, milling time, and number of units of milling medium on the manufacturing of nano co-crystals, was investigated. The critical quality attributes (CQA) monitored were particle size (PS), Zeta potential (ZP), and polydispersity index (PDI). Powder X-ray diffraction, Fourier transform infrared spectroscopy, differential scanning calorimetry, transmission electron microscopy, energy dispersive X-ray spectroscopy scanning electron microscopy, and cytotoxicity assays were used for additional characterization of the optimised nano co-crystal. The mean PS, PDI, and ZP of the optimised top-down nanocrystal were 271.0 ± 92.0 nm, 0.467 ± 0.073, and −41.9 ± 3.94 mV, respectively. In conclusion, a simple, inexpensive, rapid, and precise method of nano co-crystal manufacturing was developed, validated, and optimised using DoE and RSM, and the final product exhibited the target CQA.
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Figus, Cristiana, Masahide Takahashi, Tongjit Kidchob, Toshinobu Yoko, Massimo Piccinini, Maria Casula et Plinio Innocenzi. « Formation of hybrid nano-crystals in organic–inorganic films from a basic sol ». Journal of Sol-Gel Science and Technology 52, no 3 (18 juillet 2009) : 408–14. http://dx.doi.org/10.1007/s10971-009-2033-z.

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Schmahl, Wolfgang, Erika Griesshaber, Lurdes Fernandez-Diaz, Andreas Ziegler, Klemens Kelm, Bernd Maier, Fitriana Nindiyasari et Guntram Jordan. « Hierarchical structure of CaCO3biominerals – mesocrystals and functionalization ». Acta Crystallographica Section A Foundations and Advances 70, a1 (5 août 2014) : C239. http://dx.doi.org/10.1107/s2053273314097605.

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Skeletal parts and teeth of marine organisms, avian eggshells, trilobite and isopod eyes, and many more biomineralized tissues consist of bio-calcite or bio-aragonite crystals. We explore the nano- to micro-scale architectures of these materials by electron backscatter diffraction (EBSD) and complementary techniques. In contrast to their inorganic cousins the biogenic "crystals" are hybrid composites with small amounts of organic matrix controlling morphogenesis and critically improving mechanical performance or other functions. For the biominerals meso-crystal-like structures are ubiquitous, consisting of co-oriented nano-blocks with a mosaic-spread of a few degrees, depending on the organism and on the size of the mesocrystal entity[1, 2, 3]. The nano-mosaic can be attributed to growth by nano-particle accretion from an amorphous or gel-like precursor, where relics of organic matrix cause misorientations between the crystallized nano-blocks. Recently we were able to reproduce this feature in gel-grown calcite [Nindiyasari et al., Crystal Growth and Design, in press]. The mesocrystal-co-orientation spreads on to the micro- and even millimeter-scale, frequently with a fractal nature of co-oriented hierarchical units [Maier et al., Acta Biomaterialia, accepted for publication]. The hierarchically structured morphology of the composite crystal or polycrystal is always directed by organic matrix membranes. Sea urchin teeth show a multiplex composite crystal architecture, where different subunits of engineered shapes, Mg-contents, and small misalignments are essential prerequisites for self-sharpening [1]. The figure shows an EBSD map of dendritic interdigitating calcite crystals in an avian egg shell (color coding for crystal orientation) with an misorientation profile along the grey line.
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Chapitres de livres sur le sujet "Inorganic Nano-crystals"

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« Self Assembly and Building Nano Structures ». Dans Polymer Structure Characterization : From Nano to Macro Organization in Small Molecules and Polymers, 393–424. 2e éd. The Royal Society of Chemistry, 2013. http://dx.doi.org/10.1039/bk9781849734332-00393.

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Self assembly has been a developing theme through this monograph. Some structures, by the nature of the processes used in their synthesis form molecules which naturally self assemble. Carbon-based spheres and nano tubes have interesting and important characteristics. Sheets of carbon, graphene, exhibits electrical conductivity and physical property characteristics which make these materials potentially very important technologically. So-called intrinsic conducting polymers have been developed form polyacetylene and are utilized in display applications. Reinforcement of polymer systems can also be achieved by the use of exfoliated clay systems, in which the nano scale of the clay platelets allows order to be created within the polymer matrix. Combining inorganic and organic elements it is possible to create structures with large voids for permeation applications and to influence the growth or inorganic crystals by habit control.
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Actes de conférences sur le sujet "Inorganic Nano-crystals"

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Lee, Minyung. « Nonlinear Optical Properties of Au Nanocrystals Embedded in Silicate Thin Films ». Dans Nonlinear Optics : Materials, Fundamentals and Applications. Washington, D.C. : Optica Publishing Group, 1996. http://dx.doi.org/10.1364/nlo.1996.nthe.3.

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A lot of nanometer-sized metal particles exhibit high optical nonlinearity and fast time response in the surface plasmon absorption region,1 so they have potential application in nonlinear optical devices in the future. Especially, gold nano crystals were most intensively studied and their linear and nonlinear optical properties are relatively well known.2 However, preparation techniques for gold nano particles in inorganic oxide glass are not well established yet and controlling the nanocrystal size has to be elaborated for the systematic study on the nonlinear optical properties of metal nanocrystals.
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Hodo, Wayne, Matt Nelms, Bryan Crawford, Kenneth Livi et A. M. “Raj” Rajendran. « Multiscale Experimental Characterization of the Delamination Resistant Mechanisms Found in the Biomineralized Exoskeleton Fish Scale Composite ». Dans ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-67724.

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Engineered man-made composite (inhomogeneous) materials are well known for their superior structural properties. Man-made composite materials and multilayered systems are widely used in civilian and military applications. The combined multilayered systems are attractive because they have the characteristics of being energy absorbent, lightweight, high-strength, high-stiffness, and can provide good fatigue and corrosion resistance. Although the engineered composites are promising and offer mutual exclusive material properties that are not found in other structural materials, they are prone to delamination at the glued layered interface. In contrast to man-made composites, most superior performing materials found in nature possess a hierarchal biomineralized composite structure that tends to be delamination resistant. These delaminate resistant biocomposite structures [e.g. alligator gar’s (Atractosteus Spatula) exoskeleton fish scale] have mechanical properties that vastly exceed the properties of their relatively weak constituents. The fish scale is made up of 90 percent hard (inorganic minerals) and 10 percent soft (polymer-like organic collagen fibers) by volume. Nature integrates hard and soft materials at different length scales to form a two-layered composite that better resists delamination. The objective of this research was to use scanning electron microscopy (SEM) and nanoindentation to investigate the delamination resistant behavior occurring at the layered interface for the alligator gar fish scale composite. The SEM imagery showed at the micron level the collagen bundles + B-Ap crystals (C/B-Ap) form a distinctive two-layered system that is connected by what is described as sawtooth geometrically structured interface. The outermost layer for the exoskeleton fish scale is called ganoine while the inner layer called bone. The layers interface seems to be mainly bonded by mechanical means using sawtooth notches, rather than the chemicals adhesives used in the man-made laminated planar interfaced composites. The notched regions for ganoine+bone materials overlap and are embedded at various depths within each layer to form periodic “repeating” bonded connections. The indentation measurements taken at the nano-level showed that elastic moduli have property gradients occurring through the interfacial transition zone. Noticeably the ganoine layer has elastic moduli ranging from [98–67] GPa while the bone layer elastic moduli ranged from [20–13] GPa. The research findings indicate the sawtooth connections perhaps provide enhanced shear resistance at the interface and may help inhibit debonding. Additionally, the notched interlocking provides a less discrete (graded) interface, which seems to promote durability and delamination resistance.
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