Korea Institute of Energy Research posted this:Apparatus for producing silicon nanocrystals based on inductively coupled plasma.Researchers at the Korea Institute of Energy Research have developed a new apparatus for producing silicon nanocrystals based on inductively coupled plasma. Silicon nanocrystals have been widely investigated for several years because of their many interesting properties and potential use in several applications. Recently, silicon nanocrystals have been used in solar cells and light emitting device (LEDs). Silicon is an environmentally friendly material and is utilised for various applications in the field of electronic materials. The field of silicon nanocrystal production has grown enormously of late, in response to the observation of quantum confinement in porous silicon. Silicon is already widely used in the semiconductor industry, in large part because of its nontoxic properties and abundance, being the second most abundant element in the earth’s crust. Due to the high capacity of silicon paired with its relatively environmentally friendly properties it is an ideal material for use as a replacement to more commonly used environmentally costly materials. The common process of producing silicon nanocrystals can be classified into three distinct areas: solid-state reaction, liquid state reaction, and vapour state reaction. The solid-state reaction is the process whereby a thin film of SiO2, Si3N4 or the like containing excess Silicon (Si) is formed and subjected to heat treatment to enable the condensation of silicon and subsequent formation of silicon nanocrystals in a SiO2, Si3N4 or SiC matrix. In the liquid state reaction, silicon nanocrystals are prepared via a chemical reaction of silicon compounds, this is done through the application of variant methods, for example the high-temperature supercritical method. In the vapour state reaction, silicon nanocrystals are prepared by passing a silane compound gas through a high energy region such as laser or plasma. In the case of all three traditional silicon nanocrystals reaction methods (solid, liquid and gas) the process incurs significant cost due to the substantial need for heat energy and expensive deposition equipment. What’s more, in the liquid State reaction issues arise due to the severe difficulty in controlling particle size, which in turn leads to poor crystallinity quality. The vapour state reaction incurs further issues due to the extreme use of energy resulting in aggregated nanocrystals and the formation of secondary particles. To overcome the inherent issues of solid, liquid and vapour silicon nanocrystal reactions non-thermal plasma, such as inductively coupled plasma (IPC) has begun to be used. However, the conventional ICP-based apparatus has limitations and can result in issues pertaining to the management of the particle size of silicon nanocrystals, as well as extending reaction time and deteriorating silicon nanocrystal quality. To combat the aforementioned limitations in silicon nanocrystal production a new apparatus method has been designed, which can minimise plasma diffusion inside the reactor during production using ICP to improve the particle size characteristics and quality of the silicon nanocrystals.
Universidade de Santiago de Compostela posted this:High Quality Thin-films (down to 4nm) by Water-based Chemical SolutionCheaper alternative, versatile, with the quality required for fundamental studies and applications. - Very high quality of epitaxial (bi)layers, down to 4 nm, comparable to PLD. - Outstanding homogeneity (over 1" substrate) and very affordable alternative to high-vacuum tech. Some examples: - Yttrium Iron Garnet (YIG) over GGG; ZnO over sapphire. - Ferroelectric BiFeO3 on LSMO. Manganites, cobaltites and their combinations - Combined with MBE, e.g. Multilevel device integrated on silicon: Small, 2017, 1701614, cover (http://doi.org/10.1002/smll.201770208).
Universidade de Santiago de Compostela posted this:GRAPHENE NANOSTRUCTURES: Bottom-Up Approacha) SUBSTITUTED POLYAROMATICS to be used as building blocks in the preparation of graphene nanoribbons (GNRs) of graphene quantum dots (GQDs). b) WELL-DEFINED NANOSIZED GRAPHENES obtained by solution chemistry: homogeneous, different sizes, peripheries and substitution.
Jordi Reverter posted this:
Licensing Manager at Institut Català de Nanociència i Nanotecnologia
Cracow University of Technology posted this:Suspension containing gold or silver nanoparticles or a mixture thereof and a production method thereofThe present invention relates to a process for the preparation of nanosilver and nanogold using an aqueous extract of dog rose, white grape and knotweed. Substances which were extracted from these plants act both as reducer of silver and gold ions and stabilizing agent of forming silver and gold nanodispersion, preventing them from agglomeration and inhibiting their growth, so that the resulting particle size does not exceed 100 nm.
UATEC - Unidade de Transferência de Tecnologia posted this:Manufacturing method of metal foams and porous metals metal matrix nanocomposites with nanometric dispersoids uniformly distributed and their uses (vehicle applications, houses, machinery, equipment and devices with superior performance)A group of researchers from a Portuguese university developed an innovative method for manufacturing a new generation of closed-cell metal foams reinforced with nanodispersoids combining the powder technology method with colloidal processing. The invention respects to a product with excellent energy absorption capacity to impact and sound damping for vehicle applications, houses, machinery, equipment and devices with superior performance.
Research & Technology Organization
UNIVERSIDAD DE ALICANTE posted this:Black titanias for photocatalysis, solar cells and environmental applications• The titania is black, and then absorb in the whole visible range (band gap 2.74 eV) and maintains its photocatalytic activity at least after 5 cycles reaction with an efficiency of 95 %. • The synthesis process is simple, inexpensive and versatile (a wide variety of functional compounds can be incorporated in the structure of the titania lattice avoiding blocking the mesoporosity and maintaining the anatase structure). • Excellent thermal and hydrothermal stability. The functionality is incorporated into the structure of the titania being protected thereby.
Universitat de València posted this:Micromechanical dry exfoliation deviceThe main advantages provided by the invention are: Versatility: the method is applicable to any layered material and on any type of substrate. Simplicity: the method consists in a dry exfoliation without adhesive materials. Quality and reproducibility: the exfoliation is clean (no trace of adhesive), reproducible and it does not produce defects in the substrate. Efficiency: it is possible to deposit a high density of atomically thin layers of the material. Control: it is possible to control the pressure exerted, allowing for a fine-tuning of the deposition conditions depending on the nature of the layered material manipulated.
RAMOT at Tel Aviv University Ltd. posted this:Metal alloy nano-foams as Catalysts for Methane Dry Reforming during GTLProof of concept of metal foams as promissing GTL catalyst materials - Electrodeposited Ni-foam catalyst shown stable performance for methane reforming with an area of ca. 5 m2/g, which matches the performance of many supported powder catalysts having areas of 5-20 times larger (Colton Nadal). Advanced development (MF) of high surface-area metal alloy nano-foams as GTL catalysts targets conversion rate of 80% and volume processing of 100 liter/ gram/ hour at atmospheric pressure and 700-800C. Project ID : 6-2015-911
RAMOT at Tel Aviv University Ltd. posted this:Enhancement of Durability, Sensitivity and Selectivity of Environmental Sensors & BioSensors by Peptide NanotubesA Peptide NanoForest, is a dense array of self assembling organic nanotubes, capable of enhancing sensitivity and selectivity parameters of amperometric electrode high-performance sensors. The patented Diphenylalanine (FF) aromatic dipeptide nanotubes are formed under mild conditions from inexpensive building blocks. These bioinspired materials have a unique mechanical strength. They have a high Young’s modulus of about 20–30 GPa. In addition, the inherent biocompatibility of the structures along with the options of their chemical and biological modifications, extraordinary thermal stability, and organic solvent stability, lead to a novel class of nanostructures for sensing applications. The vertical arrangement of the peptide nanotubes enable the deposition of a larger number of nanotubes on the same surface, resulting in a remarkable surface area increase. FF peptide-nanotube-based sensors are benchmarked to CNT-based sensor, and clearly demonstrate the enhancement effect. Project ID : 3-2011-149
RAMOT at Tel Aviv University Ltd. posted this:Characterization of Porous Media for Petroleum ExcavationsA diffusion magnetic resonance (MR) method for non-invasively visualizing geochemistry and microstructures of porous sediment samples. The method provides quantification of pore sizes, pore size distribution and measure on pore eccentricities even for heterogeneous samples in the presence of free water or other liquids. Most diffusion MR methods use single pulsed-field-gradient (PFG) MR sequences; however such sequences are only beneficial for measurement of uniform, highly ordered media. We use the angular bipolar double-pulsed-field gradient (bp-d-PFG) to measure the poly dispersed sizes and shapes of pores of sedimentary rock samples with inter connections and three-dimensional organization. No a priori knowledge on the sizes or distribution is required. Project ID : 6-2012-372
Darren Burgess posted this: