The effect of stoichiometric ratio of Mg/SiO2 and annealing on physical properties of silicon nanoparticles by magnesium-thermic chemical reduction process using the SiO2 precursor

Abstract ENPLATE NI-423 is a nickel-phosphorus alloy deposited by chemical reduction without electric current. It is deposited by a stable, relatively high-speed functional electroless nickel process that produces a low-stress coating with good ductility and excellent resistance to corrosion. Its many uses include equipment for chemicals and food, aerospace components, molds and electronic devices. This datasheet provides information on composition, physical properties, and hardness. It also includes information on corrosion and wear resistance as well as heat treating, machining, joining, and surface treatment. Filing Code: Ni-343. Producer or source: Enthone Inc..

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Facile Synthesis of Carboxymethyl Cellulose Coated Core/Shell SiO2@Cu Nanoparticles and Their Antifungal Activity against Phytophthora capsici

Polymers ◽

10.3390/polym13060888 ◽

2021 ◽

Vol 13 (6) ◽

pp. 888

Author(s):

Nguyen Thi Thanh Hai ◽

Nguyen Duc Cuong ◽

Nguyen Tran Quyen ◽

Nguyen Quoc Hien ◽

Tran Thi Dieu Hien ◽

...

Keyword(s):

Antifungal Activity ◽

Carboxymethyl Cellulose ◽

Chemical Reduction ◽

Low Cost ◽

Phytophthora Capsici ◽

Reduction Process ◽

Spherical Shape ◽

Core Shell ◽

Cu Nanoparticles ◽

Average Size

Cu nanoparticles are a potential material for creating novel alternative antimicrobial products due to their unique antibacterial/antifungal properties, stability, dispersion, low cost and abundance as well as being economical and ecofriendly. In this work, carboxymethyl cellulose coated core/shell SiO2@Cu nanoparticles (NPs) were synthesized by a simple and effective chemical reduction process. The initial SiO2 NPs, which were prepared from rice husk ash, were coated by a copper ultrathin film using hydrazine and carboxymethyl cellulose (CMC) as reducing agent and stable agent, respectively. The core/shell SiO2@Cu nanoparticles with an average size of ~19 nm were surrounded by CMC. The results indicated that the SiO2@Cu@CMC suspension was a homogenous morphology with a spherical shape, regular dispersion and good stability. Furthermore, the multicomponent SiO2@Cu@CMC NPs showed good antifungal activity against Phytophthora capsici (P. capsici). The novel Cu NPs-based multicomponent suspension is a key compound in the development of new fungicides for the control of the Phytophthora disease.

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Size Control of Synthesized Silver Nanoparticles by Simultaneous Chemical Reduction and Laser Fragmentation in Origanum majorana Extract: Antibacterial Application

Materials ◽

10.3390/ma14092326 ◽

2021 ◽

Vol 14 (9) ◽

pp. 2326

Author(s):

Entesar Ali Ganash ◽

Reem Mohammad Altuwirqi

Keyword(s):

Silver Nanoparticles ◽

Irradiation Time ◽

Chemical Reduction ◽

Size Control ◽

Reduction Process ◽

Laser Wavelength ◽

X Ray Diffraction ◽

Ag Nps ◽

Transmission Electron ◽

Origanum Majorana

In this work, silver nanoparticles (Ag NPs) were synthesized using a chemical reduction approach and a pulsed laser fragmentation in liquid (PLFL) technique, simultaneously. A laser wavelength of 532 nm was focused on the as produced Ag NPs, suspended in an Origanum majorana extract solution, with the aim of controlling their size. The effect of liquid medium concentration and irradiation time on the properties of the fabricated NPs was studied. While the X-ray diffraction (XRD) pattern confirmed the existence of Ag NPs, the UV–Vis spectrophotometry showed a significant absorption peak at about 420 nm, which is attributed to the characteristic surface plasmon resonance (SPR) peak of the obtained Ag NPs. By increasing the irradiation time and the Origanum majora extract concentration, the SPR peak shifted toward a shorter wavelength. This shift indicates a reduction in the NPs’ size. The effect of PLFL on size reduction was clearly revealed from the transmission electron microscopy images. The PLFL technique, depending on experimental parameters, reduced the size of the obtained Ag NPs to less than 10 nm. The mean zeta potential of the fabricated Ag NPs was found to be greater than −30 mV, signifying their stability. The Ag NPs were also found to effectively inhibit bacterial activity. The PLFL technique has proved to be a powerful method for controlling the size of NPs when it is simultaneously associated with a chemical reduction process.

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Growth of Ag Nanoparticles by Spin Coating

Journal of Nano Research ◽

10.4028/www.scientific.net/jnanor.24.163 ◽

2013 ◽

Vol 24 ◽

pp. 163-167 ◽

Cited By ~ 4

Author(s):

S.D. Sartale ◽

A.A. Ansari

Keyword(s):

Ag Nanoparticles ◽

Spin Coating ◽

Chemical Reduction ◽

Reduction Process ◽

Thermal Reduction ◽

Environment Effects ◽

Uv Visible ◽

Absorbance Spectra ◽

Scanning Electron ◽

Better Than

Ag nanoparticles were grown on glass substrate by spin coating of Ag ions (AgNO3) solution followed by either chemical reduction, in aqueous hydrazine or NaBH4 solution, or by thermal reduction in H2 environment. Effects of different reducing agent have been explained. Morphology and absorbance spectra ofAg nanoparticles films, measured by using Scanning Electron Microscopy (SEM) and UV-visible Spectrophotometer techniques, are used to understand effect of reduction process on growth of Ag nanoparticles. To grow uniformly size distributed Ag nanoparticles thermal reduction in H2 is better than chemical reduction by aqueous either NaBH4 orhydrazine hydrate solutions.

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Morphology controllable synthesis of nickel nanopowders by chemical reduction process

Journal of Crystal Growth ◽

10.1016/j.jcrysgro.2007.12.052 ◽

2008 ◽

Vol 310 (6) ◽

pp. 1195-1201 ◽

Cited By ~ 37

Author(s):

Da-Peng Wang ◽

Dong-Bai Sun ◽

Hong-Ying Yu ◽

Hui-Min Meng

Keyword(s):

Chemical Reduction ◽

Reduction Process ◽

Controllable Synthesis

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Influence of Zr Additive on the Chemical Reduction Behaviour of MoO3 in Carbon Monoxide Atmosphere

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.317.173 ◽

2021 ◽

Vol 317 ◽

pp. 173-179

Author(s):

Alinda Samsuri ◽

Mohd Nor Latif ◽

Norliza Dzakaria ◽

Fairous Salleh ◽

Maratun Ajina Abu Tahari ◽

...

Keyword(s):

Carbon Monoxide ◽

Molybdenum Trioxide ◽

Chemical Reduction ◽

Reduction Process ◽

Chemical Effect ◽

Physical Analysis ◽

Tem Analysis ◽

Transmission Electron ◽

Reduction Behaviour ◽

Temperature Programmed

Temperature-programmed reduction (TPR) was used to observe the chemical reduction behaviour of molybdenum trioxide (MoO3) and zirconia (Zr)-doped MoO3 catalyst by using carbon monoxide (CO) as the reductant. The characterisation of catalysts was performed by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) and transmission electron microscopy (TEM) analyses. The reduction performance were examined up to 700°C and reduction was continued for 60 min at 700°C in a stream of 20 vol. % CO in nitrogen. The TPR profile showed that the doped MoO3 catalyst was slightly moved to a higher temperature (580°C) as compared to the undoped MoO3 catalyst, which began at around 550°C. The interaction between zirconia and molybdenum ions in doped MoO3 catalyst led to an increase in the reduction temperature. According to characterisation of the reduction products by using XRD, it revealed that the reduction behaviour of pure MoO3 to MoO2 by CO reductant involved two reduction stages with the formation of Mo4O11 as the intermediate product. Meanwhile, MoO3 catalyst doped with zirconia caused a delay in the reduction process and was proven by the presence of Mo4O11 species at the end of reactions. Physical analysis by using BET showed a slight increase in surface area of 3% Zr-MoO3 from 6.85 m2/g to 7.24 m2/g. As for TEM analysis, black tiny spots located around MoO3 particles revealed that the zirconia was successfully intercalated into MoO3 particles. This confirmed that formation of intermetallic between Zr-MoO3 catalyst will give new chemical and physical properties which has a remarkable chemical effect by disturbing the reduction progression of MoO3 catalyst.

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Electrooxidation of Methanol on Carbon Supported Gold Nanoparticles

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.313-314.232 ◽

2013 ◽

Vol 313-314 ◽

pp. 232-236

Author(s):

Dan Zhang

Keyword(s):

Gold Nanoparticles ◽

Catalytic Activity ◽

Competitive Adsorption ◽

Chemical Reduction ◽

Reduction Process ◽

Carbon Support ◽

Transmission Electron ◽

Supported Gold Nanoparticles ◽

Supported Gold

Activated carbon supported gold nanoparticles (Au/C) were prepared by a chemical reduction process using NaBH4as a reducing agent. The characterization of transmission electron microscope indicated that the Au nanoparticles (AuNPs) in the Au/C catalyst were highly well dispersed on the carbon support. The catalytic activity of the Au/C catalyst for the methanol electrooxidation (MEO) was investigated by the cyclic voltammetry (CV). The results displayed that the Au/C catalyst exhibited a favorable catalytic activity towards the MEO in alkaline solution. Moreover, the competitive adsorption between OH-and CH3OH on the surface of the AuNPs in the Au/C catalyst existed in the course of the MEO. Based on this competitive adsorption, the mechanism of the MEO on the Au/C catalyst was further investigated.

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Copper Coated Iron Powder Prepared by Chemical Reduction Process

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.275.161 ◽

2011 ◽

Vol 275 ◽

pp. 161-164

Author(s):

Xiao Yun Zhu ◽

Zhong Cheng Guo

Keyword(s):

Iron Powder ◽

Chemical Reduction ◽

Reduction Process ◽

Raw Material ◽

Solution Temperature ◽

X Ray Diffraction ◽

Powder Surface ◽

X Ray ◽

Reduced Iron Powder ◽

Plating Solution

Using reduced iron powder as raw material, Copper coated iron powder(CCIP) is prepared by electroless alkaline-based plating. We discuss the impacts of reductant concentration, plating solution temperature and main salt concentration on the properties of CCIP. Surface morphology and composition are studied by using scanning electron microscopy and X-ray diffraction. The results show that after coating, the iron powder surface is rougher and the copper layer is uniform in its simple metallic form without any oxide states.

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