Topic
Sodium hypophosphite
About: Sodium hypophosphite is a research topic. Over the lifetime, 1695 publications have been published within this topic receiving 15932 citations.
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TL;DR: In this paper, a multicomponent system was used to prepare multifunctional polyester fabrics with the features of self-cleaning, water and stain repellency, and thermal stability.
Abstract: In this study, multifunctional polyester fabrics with the features of self-cleaning, water and stain repellency, and thermal stability were prepared utilizing a multicomponent system. To this end, both unmodified and alkaline-hydrolyzed modified fabrics were treated with nano TiO2/citric or maleic acid/sodium hypophosphite/polysiloxane and triethanolamine via a pad-dry-cure method. Surface morphology and color variation of the samples were studied utilizing field emission scanning electron microscopy (FESEM) and CIE-Lab system, respectively. Also, energy-dispersive X-ray (EDX) analysis indicated the content of Ti, P and Si on the surface of fabrics. Thermal stability of the specimen was scrutinized through thermal gravimetric analysis (TGA) and char yield. Both hydrolysis treatment and silicone softener increased the uptake of the nanoparticles. Also, in a comparison between the utilized carboxylic acids, citric acid demonstrated superior features. Generally, the treated fabrics showed desirable self-cleaning and stain repellency with some enhanced thermal stability.
21 citations
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TL;DR: In this paper, the authors examined the mechanism of stabilizer concentration at electroless nickel wirebond electrodes and found that lead acetate completely inhibited the plating, and a bimodal distribution was observed as the concentration of thiourea/lead acetate was varied.
Abstract: This paper examines the mechanism of stabilizer concentration at electroless nickel wirebond electrodes. A one-step activation protocol was first achieved on copper substrates using acetic acid and dimethylamineborane. Thereafter nickel multilayers were grown onto the substrates using nickel sulfate heptahydrate as the source of nickel, sodium hypophosphite as the reducing agent, acetic acid as the complexing agent, and thiourea/lead acetate as the stabilizing agent. The morphology of the nickel layers and the effective concentration of the stabilizer were determined using quartz crystal microbalance, gravimetric techniques, and energy-dispersive X-ray analysis (EDX). The plating rate was obtained by measuring the thickness of the Ni-plated using X-ray fluorescence spectroscopy. It was found that lead acetate completely inhibited the plating, and a bimodal distribution was observed as the concentration of the thiourea was varied. We proposed a mechanism for the effect of stabilizer in electroless Ni baths. This mechanism was confirmed using Fourier Transform Infrared and EDX measurements. © 2003 The Electrochemical Society. All rights reserved.
21 citations
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IBM1
TL;DR: In this article, the preparation of high coercivity, finely divided magnetic alloy particles for use in recording media by reduction of salts of cobalt, and mixtures of salt of iron and cobalt in a bath containing hypophosphite and amine borane reducing agents is described.
Abstract: This invention relates to the preparation of magnetic recording media including finely divided magnetic particles. It especially relates to the preparation of high coercivity, finely divided magnetic alloy particles for use in recording media by reduction of salts of cobalt, and mixtures of salts of cobalt and iron, mixtures of salts of cobalt and nickel, in a bath containing hypophosphite and amine borane anion reducing agents. Sodium hypophosphite and dimethyl amine borane or any soluble salts which provide hypophosphite and amine borane anions in solution are reacted with soluble metal salts of cobalt alone, or cobalt with iron, or nickel dissolved in the bath. After separating and drying, the precipitate is found to consist of non-pyrophoric magnetic alloy particles, including about 0.1-5% phosphorus and about 0.1-1.5% boron, which are generally spherical in shape and which vary in size from about 0.01 micron to 3.0 microns in diameter. These particles are dispersed in a binder, the dispersion coated on a substrate, and dried to form a recording media.
21 citations
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TL;DR: In this paper, polyester fabric was modified through in situ synthesis of Cu/Cu2O nanoparticles (NPs) in one single step processing using diethanolamine.
Abstract: In this research, polyester fabric was modified through in situ synthesis of Cu/Cu2O nanoparticles (NPs) in one single step processing using diethanolamine. This introduced amide and hydroxyl active groups on the polyester surface, adjusted pH, aminolyzed, and improved the surface activity of polyester. Copper sulfate was used as precursor, sodium hypophosphite as a reducing agent and polyvinylpyrrolidone as a stabilizer in a chemical reduction route at boil as a facile and cost-effective approach. The central composite design was also utilized to optimize the processing conditions and study the effect of each variables on the weight gain, color change, and wettability of the treated fabrics. FESEM and mapping, EDX, XRD, and FTIR analysis confirmed effective assembling of Cu/Cu2O NPs on the amidohydroxylated polyester surface. The optimum treated fabric showed excellent antibacterial properties on both Staphylococcus aureus and Escherichia coli. In addition, a very good photocatalytic activity towards degradation of methylene blue solution obtained after 24 h sunlight irradiation. Further, the hydrophilicity, mechanical properties and stability of the treated fabrics in concentrated sodium hydroxide improved through formation of amidohydroxyl active groups, amidoester cross-linking and nanocross-linking within polymeric chains through in situ synthesis of Cu/Cu2O. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 133, 44856.
21 citations
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14 Apr 1989TL;DR: Amorphous ternary nickel-chromium-phosphorus alloys are electrodeposited from a bath comprising a nickel salt, a chromium salt, and a phosphorus source such as sodium hypophosphite, a complexing agent for the nickel ions, supporting salts to increase conductivity, and buffering agent.
Abstract: Amorphous ternary nickel-chromium-phosphorus alloys are electrodeposited from a bath comprising a nickel salt, a chromium salt, a phosphorus source such as sodium hypophosphite, a complexing agent for the nickel ions, supporting salts to increase conductivity, and a buffering agent. The process is carried out at about room temperature and requires a current density between about 20 to 40 A/dm 2 .
21 citations