Sodium hypophosphite

About: Sodium hypophosphite is a research topic. Over the lifetime, 1695 publications have been published within this topic receiving 15932 citations.

Alkali Metal Salts of Hydroxy Acids as Catalysts in Durable Press Finishing with Butanetetracarboxylic Acid

Abstract: Alkali metal salts of hydroxy acids have been investigated as catalysts for esterification cross-linking of cotton with 1,2,3,4-butanetetracarboxylic add to produce cotton fabrics with smooth drying properties. Of the sodium salts of several acids studied, the sodium citrates produce fabrics with the best appearance properties. The sodium citrates serve both as donors of citric acid for cross-linking and of sodium ions for catalysis of the esterification of cotton cellulose by the two polycarboxylic acids. Although the use of citric acid as an extender for the more expensive butanetracarboxylic acid has been reported in non-formaldehyde finishing of cotton fabrics for smooth drying properties the catalyst used was sodium hypophosphite. Comparisons are made between fabrics finished with the phosphorus-containing system and the butanetetracarboxylic acid/sodium citrate systems. Textile properties, fabric whiteness, effect of pad bath pH, and extent of esterification are discussed.

Atomic‐Level Phosphorus‐Doped Ultrathin Pt Nanodendrites as Efficient Electrocatalysts

Abstract: The controllable synthesis of phosphorus (P) doped noble metal electrocatalysts with a well‐defined structure and composition has attracted sufficient attention in energy chemistry. In this study, atomic‐level P‐doped Pt nanodendrites (PtP NDs) with tunable composition and highly branched architecture are successfully prepared by post‐phosphating reaction of sodium hypophosphite monohydrate at room temperature. Due to its electrophilic properties, P effectively regulates the electronic structure of the d‐orbitals of Pt. The charge change induced by P on a local scale can effectively regulate the selective adsorption of electrocatalytic reaction intermediates. The electrocatalytic results show that the η10 value of PtP NDs in hydrogen evolution reaction is only 13.3 mV, and the mass activity of PtP NDs in methanol oxidation reaction is 4.2 A mg−1, which is 3.8 times larger than that of commercial Pt/C. Most importantly, the atomic‐level P doping greatly improves the stability of PtP NDs, which is crucial to facilitating the catalysts’ commercialization process.

Isotherm and Kinetic Studies in Dyeing of Citric Acid-Crosslinked Cotton with Cationic Natural Dye

Abstract: In this study, cotton fabric was crosslinked with citric acid (CA) in the presence of sodium hypophosphite using a pad-dry-cure process under the optimum conditions. The chemistry and morphology of the crosslinked fibers were studied and compared with the untreated fibers using FTIR and SEM. The crosslinked fabric was dyed with the natural cationic dye, berberine, obtained from the roots of Berberis vulgaris. The effects of dyebath conditions, including dye concentration, pH, and temperature, on the color strength of the dyed samples were investigated, and the mean values were compared using SPSS. The isotherm and kinetics of the dyeing of the CA-treated fabric with berberine were investigated. The results showed that the color strength of the dyed samples increased with increasing the dye concentration, pH, and temperature. The best-fitting isotherm and kinetic models were Freundlich and pseudo-second-order models, respectively.

Environment-friendly surface alloyed catalytic liquid, preparation method and application method thereof

Abstract: The invention provides an environment-friendly surface alloyed catalytic liquid, a preparation method and an application method thereof. The catalytic liquid comprises components in parts by weight as follows: 17-23 parts of nickel sulfate, 20-26 parts of sodium hypophosphite, 6-10 parts of sodium acetate, 4-6 parts of lactic acid, 2-4 parts of sodium citrate, 0.0008-0.0012 part of sulfur powder, 0.04-0.08 part of sodium iodine powder and 0.6-1 part of ammonia potassium. No current distribution limit exists because no external current is needed; the geometrical shape of a plating piece is unrelated; an obtained plating is compact, small in pore, high in hardness and good in chemical and physical properties; and the problems of uneven plating thickness, sparse plating, large pore, low hardness and poor chemical and physical properties on the surface of the plating piece caused by different and complex plating piece shapes in the prior art are solved.

Sonochemistry preparation method allowing surface of copper powder to be coated with nickel and phosphorus alloy layer

Abstract: The invention relates to metal-coated composite powder, in particular to a sonochemistry preparation method allowing the surface of copper powder to be coated with a nickel and phosphorus alloy layer. The method is characterized in that high-energy ultrasonic agitation is effectively added into a traditional process of chemical plating, and the cavitation effect, the oscillation effect and other effects of the high-energy ultrasonic agitation are utilized, so that the preparation efficiency of composite copper powder coated with nickel is improved, and the problems of powder accumulating and the like are solved. In addition, when the copper powder coated with the nickel and phosphorus is prepared, sodium hypophosphite is used as a reducing agent of an acidic chemical plating solution, and the plating solution is easy to prepare and high in stability; due to the fact that activating treatment is carried out on the copper powder through hydrochloric acid before plating, the defect that traditionally, when salt activation and sensibilization are carried out on the surface of the copper powder, precious metal palladium salt is brought into the plating solution, so that the plating solution is decomposed is overcome, and also the activation processes of the powder are simplified. Meanwhile, because the high-energy ultrasonic agitation is kept in the whole plating process, the prepared composite powder is excellent in dispersity, the coating layer of the powder is complete and uniform, the plating of the powder is compact, and the powder is in an amorphous state.