scholarly journals Transformation of industrial wastewater into copper–nickel nanowire composites: straightforward recycling of heavy metals to obtain products of high added value

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Tomasz Wasiak ◽  
Pyry-Mikko Hannula ◽  
Mari Lundström ◽  
Dawid Janas
Keyword(s):  
Materials Science ◽  
Chemical Reduction ◽  
Reaction Medium ◽  
Industrial Process ◽  
Added Value ◽  
Copper Nickel ◽  
Nickel Nanowires ◽  
Simple Chemical ◽  
New Type ◽  
Nickel Nanowire

Abstract Large amounts of industrial metal containing process and waste solutions are a growing issue. In this work, we demonstrated that they could be transformed into materials of high added values such as copper-nickel nanowires (CuNi NWs) by simple chemical reduction. A thorough investigation of the parameter space was conducted. The microstructure of the obtained material was found tunable depending on the employed concentration of precursor, reducing agent, capping agent, pH, temperature, and reaction time. Moreover, the obtained product had a strong magnetic character, which enabled us to separate it from the reaction medium with ease. The results open new perspectives for materials science by proposing a new type of nanostructure: composite NWs of very promising properties, with metallic elements originating directly from industrial process solution.

scholarly journals Physical and Chemical Properties Characterization of 3D-Printed Substrates Loaded with Copper-Nickel Nanowires

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2680
Author(s):  
Ely Dannier V-Niño ◽  
Quentin Lonne ◽  
Andrés Díaz Lantada ◽  
Enrique Mejía-Ospino ◽  
Hugo Armando Estupiñán Durán ◽  
...  
Keyword(s):  
Glass Transition ◽  
Load Transfer ◽  
Chemical Properties ◽  
Layer By Layer ◽  
Copper Nickel ◽  
Nickel Nanowires ◽  
3D Printed ◽  
Nickel Nanowire ◽  
Laser Stereolithography ◽  
And Chemical Properties

This study deals with the laser stereolithography manufacturing feasibility of copper-nickel nanowire-loaded photosensitive resins. The addition of nanowires resulted in a novel resin suitable for additive manufacturing technologies based on layer-by-layer photopolymerization. The pure and nanowire-loaded resin samples were 3D printed in a similar way. Their morphological, mechanical, thermal, and chemical properties were characterized. X-ray computed tomography revealed that 0.06 vol % of the composite resin was filled with nanowires forming randomly distributed aggregates. The increase of 57% in the storage modulus and 50% in the hardness when loading the resin with nanowire was attributed to the load transfer. Moreover, the decrease in the glass transition temperature from 57.9 °C to 52.8 °C in the polymeric matrix with nanowires evidenced a decrease in the cross-linking density, leading to a higher mobility of the polymer chains during glass transition. Consequently, this research demonstrates the successful dispersion and use of copper-nickel nanowires as a reinforcement material in a commercial resin for laser stereolithography.

scholarly journals Effect of the method for the elimination of inhibitors present in Miscanthus giganteus hydrolysates on ethanol production effectiveness

2021 ◽  
Author(s):  
Natalia Kordala ◽  
Małgorzata Lewandowska ◽  
Włodzimierz Bednarski
Keyword(s):  
Control Experiment ◽  
Positive Impact ◽  
Reaction Medium ◽  
Fermentation Medium ◽  
Added Value ◽  
Enzymatic Hydrolysate ◽  
Miscanthus Giganteus ◽  
Lignocellulose Conversion ◽  
Experimental Variant ◽  
Ethanol Synthesis

AbstractThe pretreatment of lignocellulosic material performed to improve substrate’s susceptibility to enzymatic hydrolysis is usually accompanied by reactions leading to the synthesis of compounds that inhibit the metabolic activity of microorganisms. Their toxicity is the main obstacle to the successful bioconversion of lignocellulosic hydrolysates. The identification of these inhibitors and the choice of the optimal detoxication method are crucial for the improving the efficiency of fermentation processes. Material rinsing with water after processing is a common detoxication practice. However, it generates material losses, thus affecting contents of saccharides in the fermentation medium, which may in turn trigger higher costs of lignocellulose conversion to ethanol and other products with a higher added value. A study was undertaken to determine the effect of selected methods for the detoxication of an enzymatic hydrolysate from Miscanthus giganteus on the fermentation efficiency of saccharide derivatives. The experiment conducted with Mucor rouxii DSM 1191 demonstrated the usability of the detoxication method based on the activated carbon. After 96-h fermentation of Miscanthus hydrolysates, the alcohol content in the post-reaction medium was higher by 14% than in the control experiment wherein the material was rinsed with water after pretreatment. The experiment carried out with Saccharomyces cerevisiae 7, NRRL 978 showed no positive impact of the alternative detoxication methods replacing material rinsing on the efficiency of ethanol synthesis. The highest concentration of this metabolite (2.04% (v/v)) was obtained in the experimental variant in which the mentioned operation was coupled with detoxication of hydrolysates using calcium hydroxide.

Facile Synthesis of Silver Nanoparticles by Chemical Reduction Route

2013 ◽  
Vol 756 ◽  
pp. 99-105
Author(s):  
Rajasingam Ratnamalar ◽  
Mustapha Mariatti ◽  
Zulkifli Ahmad ◽  
Sharif Zein Sharif Hussein
Keyword(s):  
Silver Nanoparticles ◽  
Ag Nanoparticles ◽  
Chemical Reduction ◽  
Facile Synthesis ◽  
Cubic Lattice ◽  
Vis Spectroscopy ◽  
Simple Chemical ◽  
The Face ◽  
Fine Control ◽  
Xrd Patterns

This work reports a simple chemical reduction route for the preparation of uniformed Ag nanoparticles whereby a fine control over the sizes of the Ag nanoparticles was studied by varying the concentrations of the reducing agents used. In characterization, UV-Vis spectroscopy showed the changes in optical properties of the Ag nanoparticles with regards to their sizes, where as the XRD patterns of the synthesized Ag nanoparticles confirmed the distinct peaks approximately at 2θ = 38.1°, 44.3°, 64.4°, 77.4°, and 81.5 representing Bragg’s reflections from (111), (200), (220), (311), and (222) planes of the face centred cubic lattice phase. This route of synthesis is feasible to produce Ag nanoparticles with diameters in the range of 30-45 nm.

Silver nanoplates and nanowires by a simple chemical reduction method

2011 ◽  
Vol 86 (1) ◽  
pp. 87-92 ◽  
Author(s):  
Zaheer Khan ◽  
Javed Ijaz Hussain ◽  
Sunil Kumar ◽  
Athar Adil Hashmi
Keyword(s):  
Reduction Method ◽  
Chemical Reduction ◽  
Chemical Reduction Method ◽  
Silver Nanoplates ◽  
Simple Chemical

Sedimentation of Substitutional Solute Atoms in Condensed Matter: New Type of Diffusion

2005 ◽  
Vol 237-240 ◽  
pp. 30-37 ◽  
Author(s):  
Tsutomu Mashimo
Keyword(s):  
Gravity Field ◽  
Diffusion Coefficients ◽  
Materials Science ◽  
Condensed Matter ◽  
Diffusion Mechanism ◽  
Science Research ◽  
Substitutional Solute ◽  
Self Consistent ◽  
New Type ◽  
Solute Atoms

Ultra-strong gravitational field (Mega-gravity field) causes the sedimentation of even atoms (diffusion), and is expected to create a nonequilibrium crystal-chemical state in multi-component condensed matter. However, the materials science research under mega-gravity field has now remained as an unexploited field, while the sedimentation of molecules or polymer had been used in biochemistory. We presented a self-consistent diffusion equation for sedimentation of atoms in condensed matter. Next, we developed an ultracentrifuge apparatus to generate strong acceleration field of over 1 million (1x106) g at temperature range up to 〜300 °C, and, recently, succeeded in realization of the sedimentation of substitutional solute atoms in some alloys of Bi-Sb, In-Pb, Bi-Pb systems, etc. The diffusion coefficients in sedimentation on Bi-Sb alloy were estimated to be much greater than those at normal conditions by a factor of >20. It is suggested that the sedimentation of substitutional atoms in solids or liquids can be explained in a new type of diffusion, where the diffusion mechanism for substitutional solute atoms was yet unknown. In this article, the recent progress in the investigation of sedimentation of atoms under mega-gravity field is reviewed, and the diffusion mechanism is discussed. The application of the mega-gravity field is also discussed.

scholarly journals Recent Trends in Covalent and Metal Organic Frameworks for Biomedical Applications

Nanomaterials ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 916 ◽  
Author(s):  
Georges Chedid ◽  
Ali Yassin
Keyword(s):  
Drug Delivery ◽  
Biomedical Applications ◽  
Materials Science ◽  
High Surface ◽  
Metal Organic Frameworks ◽  
Great Promise ◽  
Surface Areas ◽  
Metal Organic ◽  
New Type ◽  
Recent Trends

Materials science has seen a great deal of advancement and development. The discovery of new types of materials sparked the study of their properties followed by applications ranging from separation, catalysis, optoelectronics, sensing, drug delivery and biomedicine, and many other uses in different fields of science. Metal organic frameworks (MOFs) and covalent organic frameworks (COFs) are a relatively new type of materials with high surface areas and permanent porosity that show great promise for such applications. The current study aims at presenting the recent work achieved in COFs and MOFs for biomedical applications, and to examine some challenges and future directions which the field may take. The paper herein surveys their synthesis, and their use as Drug Delivery Systems (DDS), in non-drug delivery therapeutics and for biosensing and diagnostics.

INVESTIGATION OF SHAPE CONTROLLED SILVER NANOPLATES BY A SIMPLE CHEMICAL REDUCTION METHOD

NANO ◽  
2013 ◽  
Vol 08 (03) ◽  
pp. 1350030 ◽  
Author(s):  
ERIC FRIBOURG-BLANC ◽  
DUNG THI MY DANG ◽  
TUYET THI THU LE ◽  
CHINH DUNG TRINH ◽  
THANH THI NU THANH ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Reduction Method ◽  
Chemical Reduction ◽  
Relative Concentration ◽  
Trisodium Citrate ◽  
Edge Length ◽  
Ambient Conditions ◽  
Chemical Reduction Method ◽  
Vis Spectroscopy ◽  
Simple Chemical

This paper discusses the function of hydrogen peroxide and trisodium citrate (TSC) in the synthesis of silver ( Ag ) nanoplates through a simple chemical reduction method in ambient conditions. By this method, high purity Ag nanoplates were successfully generated (up to 100%). It was found that the amounts of hydrogen peroxide and TSC added to the solution are key to controlling the shape of Ag nanoparticles from spherical nanoparticles to hexagonal nanoplates and triangular nanoplates, depending on the Ag -to-hydrogen peroxide ratio and the Ag -to-TSC ratio used. This unique shape evolution process was carefully followed by a combination of ultraviolet-visible (UV-Vis) spectroscopy and transmission electron microscopy (TEM). The mean edge length of the triangular nanoplates varies from 65 nm to 100 nm. Polyvinyl pyrrolidone (PVP) is shown to increase the in-plane dimensions of the nanoplates as its relative concentration to Ag increases.

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