Showing papers on "Sodium hypophosphite published in 2009"
TL;DR: In this paper, the authors presented an alternative method for the preparation of bulk and supported nickel phosphide by the heat treatment of a mixed salt precursor (nickel chloride and sodium hypophosphite) in a static protecting gas atmosphere up to 300°C.
122 citations
TL;DR: In this paper, a nano titanium dioxide photo-catalyst was used to achieve a cross-linking finish on the bleached cotton fabric by using a nano TiO2 photocatalyst which can effectively operate under UV irradiation.
Abstract: The present research attempts to accomplish a cross-linking finish on the bleached cotton fabric by using a nano titanium dioxide photo-catalyst which can effectively operate under UV irradiation. In this study, the bleached cotton fabrics were treated with two cross-linking agents including 1,2,3,4-butane tetracarboxylic acid (BTCA) and citric acid (CA) in the presence of sodium hypophosphite (SHP) and nano TiO2 (NTO) and then, cured at three different conditions: UV irradiation (UV), High temperature (High temp) and a combination of UV and high temperature (UV–Temp). In addition, the bending length, yellowness index, wet and dry crease recovery angle, tensile strength retention (%) and water drop absorption time of treated samples were evaluated. Also, treated cotton fabrics and NTO were characterized by Scanning Electron Microscopy (SEM), Energy Dispersive X-ray (EDX) and X-ray Diffraction (XRD). The results show that samples treated with BTCA have higher values of dry crease recovery angle (DCRA) as compared with samples treated with CA. It was also found that DCRA values are higher for samples treated under UV–High temp condition than samples treated under UV or High temp condition alone. Nevertheless, yellowness indexes with BTCA were lower than CA and tensile strengths retention (%) with CA were higher than BTCA.
116 citations
TL;DR: In this article, a one-step method for the preparation of stable, non-agglomerated copper nanofluids by reducing copper sulphate pentahydrate with sodium hypophosphite as reducing agent in ethylene glycol as base fluid by means of conventional heating is presented.
86 citations
TL;DR: In this paper, the preparation of Ni-P-B coatings on surface of quartz optical fibers was carried out using electroless plating method and their optimal values were determined by orthogonal experiment.
52 citations
TL;DR: In this paper, the effects of process parameters such as time, stabilizer concentrations, pH of the plating bath and plating's temperature on the electroless Ni-P coating efficiency were investigated.
47 citations
TL;DR: In this paper, the authors reported the successful synthesis of cobalt phosphide (Co2P) nanostructures built up of nanorods via a simple hydrothermal route using white phosphorus (WP), sodium hypophosphite and cobalt dichloride as starting reactants in the presence of polyvinylpyrrolidone (PVP, 30 K).
Abstract: In this paper, we report the successful synthesis of cobalt phosphide (Co2P) nanostructures built up of nanorodsvia a simple hydrothermal route using white phosphorus (WP), sodium hypophosphite and cobalt dichloride as starting reactants in the presence of polyvinylpyrrolidone (PVP, 30 K). The as-obtained product was characterized by means of X-ray powder diffraction (XRD), energy dispersive spectrometry (EDS), (high resolution) transmission electron microscopy (TEM/HRTEM), selected area electron diffraction (SAED) and field emission scanning electron microscopy (FESEM). It was found that sodium hypophosphite played an important role in the formation of the Co2P nanostructures. Some factors influencing the morphology of the product, including the reaction temperature, amount of sodium hypophosphite, surfactant, and so on, were investigated. The capacity of the product to remove heavy metal ions was also studied.
39 citations
TL;DR: In this article, the improved properties of wool fabrics were evaluated using urea bisulfite solubility test, tensile strength, elongation, and crease recovery angle.
Abstract: Modification of woolen fabrics were achieved by grafting β-cyclodextrin and β-chloro triazinylcyclodextrin in the presence of citric acid (CA) as cross-linking agent and phosphorous salts such as sodium hypophosphite (SHP) and sodium dihydrogen phosphate (SDP) using the pad dry cure technique. CA is expected to react with the β-CD (or wool) hydroxyl groups and wool terminal amino groups, to form ester cross-linkages or ionic bonds. The improved properties of wool fabrics were evaluated using urea bisulfite solubility test, tensile strength, elongation and crease recovery angle. Also, yellowness index and scanning electron microscopy were performed. Woolen fabrics treated with CA alone and CA/ CD shows antimicrobial properties.
30 citations
TL;DR: In this article, β-cyclodextrin was grafted onto PET textile materials by using a polyfunctional reagent 1,2,3,4-butanetetetracarboxylic acid.
Abstract: The purpose of our research was to prepare nanoencapsulated PET textile materials, which would be used as odor carriers (underwear and bed sheets with aromatherapy activities) or would act as malodorous absorbers (absorption of cigarette smell). We grafted β-cyclodextrin onto PET textile materials by using a polyfunctional reagent 1,2,3,4-butanetetracarboxylic acid. To reduce the curing temperature of the reaction, catalysts such as sodium hypophosphite and cyanamide were used. We prepared nanoencapsulated polyester textile materials with increased adsorption capacity and with delayed release of volatile or active compounds. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009
26 citations
TL;DR: Phosphorus-doped titania powders were prepared by a sol-gel method using titanium (IV) tetrabutoxide and sodium hypophosphite as starting materials and the photocatalytic activity was tested by observing the photodecomposition of methylene blue.
Abstract: Phosphorus-doped titania powders were prepared by a sol-gel method using titanium (IV) tetrabutoxide and sodium hypophosphite as starting materials. The as-prepared products were characterized by XRD, XPS, TEM and UV-vis spectroscopy. The TiO2 powders calcined at 400°C for 5 h in an N2 atmosphere showed an anatase structure. The crystallinity of TiO2 was improved by calcination both in air and in N2 atmospheres. Furthermore, UV-vis spectroscopy analysis indicated that the absorption edge of the samples shifted to a longer wavelength after calcination. The XRD results suggested that phosphorus was doped into the crystal lattice of TiO2. The electronic states of phosphorus were determined by XPS, which indicated that the phosphorus in the prepared titania powders was in a lower oxidization state than the pentavalent oxidation state of phosphorus. Also, the photocatalytic activity was tested by observing the photodecomposition of methylene blue.
26 citations
TL;DR: In this paper, the effect of the mol ratio of CoSO 4 /CoSO 4 ǫ+NiSO 4 in plating bath on the growth behavior of electroless Ni-Co-P films was studied.
23 citations
TL;DR: In this article, the effects of process parameters such as pH, temperature and coating time of the plating bath on the phosphorus content and deposition rate of the electroless Ni-P coating were studied.
Journal Article•
TL;DR: In this paper, the effects of process parameters such as pH, temperature and coating time of the plating bath on the phosphorus content and deposition rate of the electroless Ni-P coating were studied.
Abstract: Carbon microcoils (CMCs) have been coated with a nickel-phosphorus (Ni-P) film using an electroless plating process, with sodium hypophosphite as a reducing agent in an alkaline bath. CMC composites have potential applications as microwave absorption materials. The morphology, elemental composition and phases in the coating layer of the CMCs and Ni-coated CMCs were investigated by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD), respectively. The effects of process parameters such as pH, temperature and coating time of the plating bath on the phosphorus content and deposition rate of the electroless Ni-P coating were studied. The results revealed that a continuous, uniform and low-phosphorous nickel coating was deposited on the surface of the CMCs for 20 min at pH 9.0, plating bath temperature 70 °C. The as-deposited coatings with approximately 4.5 wt.% phosphorus were found to consist of a mix of nano- and microcrystalline phases. The mean particle size of Ni-P nanoparticles on the outer surface of the CMCs was around 11.9 nm. The deposition rate was found to moderately increase with increasing pH, whereas, the phosphorous content of the deposit exhibited a significant decrease. Moreover, the material of the coating underwent a phase transition between an amorphous and a crystalline structure. The thickness of the deposit and the deposition rate may be controlled through careful variation of the coating time and plating bath temperature.
TL;DR: In this article, the authors showed that the surfaces of the CoWP films contained large amounts of oxides and hydroxide of tungsten and cobalt, respectively, and an AES depth profile revealed that the bulk of the films predominantly consisted of cobalt.
TL;DR: In this paper, an electroless plating technique was used to coat Sn-Ni alloy on copper substrate with high Sn content by adding the amounts of thiourea as special complexing agent and sodium hypophosphite as reducing agent.
TL;DR: In this paper, the immersion deposition of Ni-P films on Si(100) surface without prior activation by metallic catalytic was carried out in an aqueous alkaline solution containing sodium hypophosphite.
TL;DR: In this paper, the relation between the composition, morphology, and corrosion resistance of the electrolytic CoMoP coatings plated at various current densities from citrate baths containing ammonia or hydrazine and various amounts of sodium hypophosphite is studied.
Abstract: The relation between the composition, morphology, and corrosion resistance of the electrolytic CoMoP coatings plated at various current densities from citrate baths containing ammonia or hydrazine and various amounts of sodium hypophosphite is studied. Phosphorus was included in the coatings as a result of the electrochemical reduction of hypophosphite ions. Ternary Co-Mo-P alloys containing up to 26 at % Mo and up to 3 at % P were electroplated. Coatings of the highest quality were obtained from a bath containing hydrazine admixture at a temperature of 50°C. Corrosion resistance of CoMoP coatings increases with an increase in the Mo content and a certain decrease in the phosphorus amount in the deposit. The best protective properties were demonstrated by coatings obtained at higher concentrations of sodium hypophosphite and high deposition current densities when CoMoP alloys containing 23 ± 2 at % Mo and up to 1.5 at % P were formed.
Patent•
17 Jun 2009
TL;DR: In this article, a method for preparing carbon-supported nucleocapsid type Ni-Pt particles for direct methanol fuel cell catalysts is presented, which consists of adopting sodium citrate as a stabilizer, adopting cationic surfactant CTAB as dispersant, using sodium hypophosphite to reduce nickel acetate, generating a Ni kernel on the surface of Vulcan XC-72 or mesoporous carbon treated with sodium borohydride, washing superfluous sodium pyrophosphite and generating a Pt shell on the Ni kernel through
Abstract: The invention provides a method for preparing carbon-supported nucleocapsid type Ni-Pt particles for direct methanol fuel cell catalysts, which belongs to a preparation process of direct methanol fuel cell catalysts. The method comprises the steps of adopting sodium citrate as a stabilizer, adopting cationic surfactant CTAB as dispersant, using sodium hypophosphite to reduce nickel acetate, generating a Ni kernel on the surface of Vulcan XC-72 or mesoporous carbon treated with sodium borohydride, washing superfluous sodium hypophosphite and generating a Pt shell on the surface of the Ni kernel through chemical replacement. The catalyst has a structure with the Ni kernel and the Pt shell, and has the advantages of low Pt support amount and high catalytic activity.
Patent•
21 Jan 2009
TL;DR: In this article, the authors provided a formulation of medium-temperature acidic electroless nickel-phosphorus alloy, which is characterized in that the formulation is as follows: 25 to 30 grams of nickel sulfate per liter, 25 to 35 grams of sodium hypophosphite per liter.
Abstract: The invention provides a formulation of medium-temperature acidic electroless nickel-phosphorus alloy, which is characterized in that the formulation is as follows: 25 to 30 grams of nickel sulfate per liter, 25 to 35 grams of sodium hypophosphite per liter, 12 to 18 grams of sodium acetate per liter, 05-13 milligrams of thiourea per liter, 7 to 13 milliliters of lactic acid per liter, 7 to 13 milliliters of acetic acid per liter, 4-10 grams of organic acid per liter, 5-16 milligrams of potassium iodide or potassium iodate per liter, and the loadage is between 05 and 15 dm /L The invention has the advantages that: the formulation improves the stability of a plating solution, obviously improves plating rate, has good corrosion resistance and the comprehensive properties of plating; the stability of the plating solution can reach over 1800 s; the stability of periodic experiments is more than ten periods; the corrosion resistance of the plating reaches over 130 s; and the hardness of the plating reaches 480 HV
TL;DR: A simple method for the formation of palladium nanoparticles on aluminum and aluminum oxide surface is demonstrated in this article, where the method is combined with the electroless nickel plating, which facilitates two steps metallization technique on the respective surfaces.
Patent•
25 Nov 2009
TL;DR: A stable chemical nickel-plating plating solution and a preparation method thereof were revealed in this paper. But they did not specify the type of plating material used, only that it was stable with no chlorine when using.
Abstract: The invention discloses a stable chemical nickel-plating plating solution and a preparation method thereof. The plating solution comprises following substances per liter: 3-10g of succinic acid, 20-25g of sodium acetate, 8-20ml of lactic acid, 4-16g of citric acid, 1-7ml of propanoic acid, 8-20g of malic acid, 30-35g of sodium hypophosphite, 30-35g of nickel sulfate and 1-9mg of aminothiourea. The preparation method comprises steps of dissolving succinic acid and sodium acetate in water, adding lactic acid, using sodium carbonate to adjust pH=3-4 of solution, then adding citric acid, propanoic acid, malic acid, sodium hypophosphite, nickel sulfate and aminothiourea, at last using sodium carbonate to adjust pH=3.8-4.1 of solution. Compared with the prior art, the plating solution has high stability with no chlorine when using, and high tolerance.
Patent•
06 May 2009
TL;DR: In this paper, a method for preparing polyacrylic acid or sodium polyacrylate is presented, which consists of the following steps: 5 to 35 mass percent of crylic acid, 0 to 14 mass percent sodium hydroxide, 0.5 to 6 mass amount of persulfate,0.2 to 3 mass proportion of sodium bisulfite, 0.05-3 mass proportion Lascorbic acid, Lascoric acid, and 50 to 90 mass proportion water are mixed to have polymerization reaction for over one hour at a temperature of between 25
Abstract: The invention discloses a method for preparing polyacrylic acid or sodium polyacrylate. The method comprises the following steps: 5 to 35 mass percent of crylic acid, 0 to 14 mass percent of sodium hydroxide, 0.5 to 6 mass percent of persulfate, 0.2 to 3 mass percent of sodium bisulfite , 0.05 to 3 mass percent of L-ascorbic acid, 0.5 to 10 mass percent of sodium hypophosphite and 50 to 90 mass percent of water are mixed to have polymerization reaction for over one hour at a temperature of between 25 and 60 DEG C to obtain the polyacrylic acid or the sodium polyacrylate; the viscosity-average molecular weight of the polyacrylic acid or the sodium polyacrylate is between 800 and 50,000; and the conversion rate of the polyacrylic acid or the sodium polyacrylate can reach over 96 percent. The method has the advantages that the polyacrylic acid or the sodium polyacrylate with low molecular weight is synthesized once, has low starting reaction temperature, less energy consumption, rapid reaction speed, high utilization efficiency of equipment, a simple process and convenient operation.
TL;DR: Biological investigation has demonstrated that the new germanium compound of caffeic acid is stronger anti-tumor activity than 3-(2, 8, 9-trioxa-aza-1-germatricyclo)hydroxylcinnamic acids with lower toxicity.
Abstract: The new germanium compound of caffeic acid, (1), has been obtained to compare anti-tumor activities with 3-(2, 8, 9-trioxa-aza-1-germatricyclo[3. 3. 3. 0]undecane-1-yl)-hydroxycinnamic acids which have been researched previously. Compound was prepared which mainly used caffeic acid, germanium dioxide, sodium hypophosphite, triethanolamine as materials by reducing reaction, Micheal addition reaction and transesterification. The structure is comfirmed by (1)H-NMR and MS. Biological investigation has demonstrated that the compound is stronger anti-tumor activity than 3-(2, 8, 9-trioxa-aza-1-germatricyclo[3. 3. 3. 0]undecane-1-yl)-hydroxylcinnamic acids with lower toxicity.
Patent•
13 May 2009
TL;DR: In this paper, a chemical plating bath for high phosphorus plating of the Ni-P alloy onto the surface of 304 stainless steel is described, which improves the resistance of stainless steel to C1 corrosion and abrasion.
Abstract: The invention relates to chemical plating bath for the high phosphorus chemical plating of the Ni-P alloy onto the surface of 304 stainless steel, and belongs to the technical field of the bath technological recipe for chemical nickel plating onto the surface of stainless steel. The chemical plating bath consists of the following raw materials: nickel sulphate, sodium hypophosphite, lactic acid, citric acid, EDTA disodium, glycine, glycolic acid, a stabilizer of KIO3, sodium acetate and succinic acid. The high phosphorus coating plated by the chemical plating bath on the surface of stainless steel has excellent resistance to the acidic, alkaline and salt corrosion. In particular the resistance to C1 corrosion is better than that of the body of the 304 stainless steel. With respect to the mechanical property, the hardness of the coating is 450 to 550HV and is higher than that of the body of the 304 stainless steel. The chemical plating bath improves the resistance of stainless steel to C1 corrosion and abrasion, and expands the application field of stainless steel.
Patent•
26 Aug 2009
TL;DR: In this paper, a composite chemical nickel and phosphor plating method is described, which is characterized by comprising the following steps: 1) the pH value of the chemical Nickel and Phosphor Plating solution containing nickel sulfate with the concentration being 26 to 30 g/l, sodium hypophosphite, sodium citrate, sodium acetate, and neodymium(III) sulfate octahydrate is mixed with the chemical NN and PhN plating solution uniformly at the addition amount is 0.4 to 0.8g/l.
Abstract: The invention relates to a composite chemical nickel and phosphor plating method, characterized by comprising the following steps: 1) the pH value of the chemical nickel and phosphor plating solution containing nickel sulfate with the concentration being 26 to 30 g/l, sodium hypophosphite with the concentration being 23 to 27 g/l, sodium citrate with the concentration being 38 to 42 g/l and sodium acetate with the concentration being 23 to 27 g/l is adjusted to be 9 to 10, neodymium(III) sulfate octahydrate is mixed with the chemical nickel and phosphor plating solution uniformly at the addition amount is 0.4 to 0.8 g/l, the above solution is plated on the pretreated neodymium iron boron magnet under the effect of the ultrasonic wave for 10 to 60 minutes to obtain a nickel and phosphor plating layer with the crystal grain size of 5 to 8 nm; 2) the pH value of the chemical nickel and phosphor plating solution containing nickel sulfate with the concentration being 22 to 26 g/l, sodium hypophosphite with the concentration being 28 to 32 g/l, sodium citrate with the concentration being 43 to 47 g/l and sodium acetate with the concentration being 28 to 32 g/l is adjusted to be 4.2 to 5.6, the plated neodymium iron boron magnet in the step(1) is placed into the chemical nickel and phosphor plating solution in the step(2) for plating for 30 to 120 minutes, the amorphous nickel and phosphor plating layer is obtained. Compared with the prior art, the plating layer has high adhesion and good corrosion resistance, the thickness of the plating layer can be reduced and the loss of the magnetic property can be lowered.
Patent•
17 Jun 2009
TL;DR: In this article, a chemical Ni-P-nano-TiO2 depositing photo-catalysis composite coating plating solution and a plating method thereof are presented, aiming at solving the problems that the nano-Ti-O2 photo catalyst is easy to be deactivated and agglomerate and is difficult to be recovered, and the like.
Abstract: The invention relates to a chemical Ni-P-nano-TiO2 depositing photo-catalysis composite coating plating solution and a plating method thereof, aiming at solving the problems that the nano-TiO2 photo-catalyst is easy to be deactivated and agglomerate and is difficult to be recovered, and the like. The nano-TiO2 photo-catalytic composite coating plating solution comprises the chemical raw materials as follows: nickel sulfate, sodium hypophosphite, lactic acid, propionic acid, boric acid, nano-TiO2, lead acetate and sodium dodecyl benzene sulfonate. The process conditions for plating a workpiece are defined as follows: the pH value of the composite coating solution is 4.0-5.5; the plating time is 2 hours at the temperature of 75-90 DEG C. On the basis of the particularity of the nano-particle, the prepared composite coating has the functions of anti-corrosion, anti-abrasion, photo-catalysis, self-degradation and recycling. The nano-TiO2 is introduced in chemical plating solution to co-deposit with Ni-P substrate so as to prepare the Ni-P-nano TiO2 chemical composite coating and provide a feasible loading method for the practical application of the nano-TiO2.
Patent•
25 Mar 2009
TL;DR: In this paper, a method for manufacturing an oxygen separator from low carbon steel and by the process of nickel and phosphor plating on the surface, wherein, the process consists of manufacturing of a main body, oil removal on a surface by a solvent, alkaline oil removal, rinsing, anodic oil removal.
Abstract: The invention discloses a method for manufacturing an oxygen separator The oxygen separator comprises an oxygen separator body which is manufactured from low carbon steel and by the process of nickel and phosphor plating on the surface, wherein, the process of nickel and phosphor plating comprises the steps of manufacturing of a main body, oil removal on the surface by a solvent, alkaline oil removal, rinsing, anodic oil removal, rinsing, acid dipping, rinsing, surface neutralization, rinsing, preheating, chemical nickel and phosphor plating, rinsing, passivation and rinsing The chemical nickel and phosphor plating is alkaline chemical nickel and phosphor plating which adopts hypophosphite as a reducing agent and has the technological formula: 40 g/L to 45 g/L of nickelous chloride, 8 g/L to 12 g/L of sodium hypophosphite, 90 g/L to 100 g/L of sodium citrate, 40 g/L to 50 g/L of ammonium chloride and pH value of 85 to 10; the temperature of the nickel and phosphor plating is 90 DEG C to 95 DEG C, the deposition velocity 8 Mum/h to 10 Mum/h and the thickness 75 Mum to 200 Mum; and the material of a coating bath is preferred to be 1Cr18Ni9Ti stainless steel plates or acid-proof enamel or porcelain The oxygen separator manufactured by the method of the invention has good corrosion resistance, high surface hardness and good wear resistance, spares the defects of pinholes, shedding, cracks and the like on the surface and ensures even thickness in a cladding, simple technological operation and less environmental pollution
Patent•
28 Jan 2009
TL;DR: In this paper, a glass fiber Ni-Fe-Pr-P alloy was used to prepare an electroless plating solution, and a chemical plating technology was utilized to obtain good electrical conductivity.
Abstract: The invention relates to a Ni-Fe-Pr-P plating solution, a glass fiber Ni-Fe-Pr-P alloy and a preparation method thereof, which is characterized in that a formula of the plating solution comprises nickel sulfate, sodium hypophosphite, ferrous sulfate, praseodymium nitrate, sodium citrate, malic acid, butane diacid, ammonium sulfate, distilled water, thiourea, urea and concentrated hydrochloric acid; the preparation method comprises the following steps: main salts, namely, the nickel sulfate and the ferrous sulfate are put in the distilled water, added with the praseodymium nitrate, the distilled water and the concentrated hydrochloric acid after dissolution, and then added with sodium citrate, malic acid, butane diacid, ammonium sulfate, sodium hypophosphite, thiourea and urea in sequence for dissolution and then added with ammonia to prepare the electroless plating solution. A chemical plating technology is utilized to prepare the glass fiber Ni-Fe-Pr-P alloy. The beneficial effects are that as a moderate amount of praseodymium nitrate is added to the electroless plating solution, the content of praseodymium in a prepared alloy plating layer is 10 percent to 20 percent; the glass fiber which adopts the chemical plating has good electrical conductivity and therefore can be used as a conductive filler and an electric loss absorbent.
TL;DR: The potential for energy saving in sodium hypophosphite production using pinch technology is shown in this article, where the significant potential for saving energy in sodium pyroxide production is shown.
Abstract: The significant potential for energy saving in sodium hypophosphite production using pinch technology is shown. Economy due to application of heat recovery system is 1 200 000 USD. Installation of new recuperative heat exchangers will cost about 1 400 000 USD and payback period is 14 months.
Patent•
14 Oct 2009
TL;DR: In this article, a method for preparing high-purity sodium hypophosphite, which comprises the following processing steps: matching materials, wherein, the highpurity high-polysilicon is prepared from the following components according to proportioning by weight: 100 portions of yellow phosphorus, 70 portions of lime, 290 portions of ionic-membrane caustic soda and 500 portions of water; evenly mixing the components and reacting to obtain sodium hypphosphite solution and calcium phosphate precipitation.
Abstract: The invention provides a method for preparing high-purity sodium hypophosphite, which comprises the following processing steps: matching materials, wherein, the high-purity sodium hypophosphite is prepared from the following components according to proportioning by weight: 100 portions of yellow phosphorus, 70 portions of lime, 290 portions of ionic-membrane caustic soda and 500 portions of water; evenly mixing the components and reacting to obtain sodium hypophosphite solution and calcium phosphate precipitation; adding barium hypophosphate prepared from hypophosphorous acid and barium carbonate to the sodium hypophosphite solution, and evenly mixing the solution; improving the purity of the product solution by a method of adding powdered activated carbon for decoloring and adsorbing chloride ions; filtering with a membrane filtering machine with the pore diameter being 0.2 mum, so as to trap the tiny impurities; and additionally arranging a spraying system on a centrifuge and washing crystals with de-ionized water solvent. The invention has the advantages that the crystals are sprayed and washed at the time of centrifugal separation, and the mother solution adhered to the surfaces of the crystals can be washed away, thereby ensuring the obvious purification effect; the method can remove the cumbersome and low-efficiency preparation process, simplify the preparation process and reduce the preparation cost; and the content of the product can reach 103.56%.
Patent•
24 Jun 2009
TL;DR: In this article, a method for preparing a nanometer nickel pellet with magnetic property was proposed, in which a mixture of nickel dichloride, polyvinylpyrrolidone, potassium hydroxide and sodium hypophosphite was used.
Abstract: The invention relates to a method for preparing a nanometer nickel pellet with magnetic property. Nickel dichloride, polyvinylpyrrolidone, potassium hydroxide and sodium hypophosphite are dissolved in water respectively; a nickel dichloride solution and a potassium hydroxide solution are mixed, are introduced with nitrogen gas, then added with a sodium hypophosphite solution and continuously kept in a nitrogen introducing state for 10 minutes; the mixed solution is transferred to an inner tank of a hydrothermal kettle with cubage of 15 ml and is continuously introduced with nitrogen gas for protection; the hydrothermal kettle is sealed; the mixed solution reacts for 40 to 60 minutes at a temperature of between 130 and 150 DEG C; and an obtained product is washed by water and ethanol respectively, subjected to magnetic separation and is dried to obtain the nanometer nickel pellet with the magnetic property. The nanometer nickel pellet is subjected to characteristic representation through x ray diffraction (XRD), a transmission electron microscope (TEM) and a scanning electron microscope (SEM); the result shows that the particle diameters of a series of prepared nanometer nickel pellets are between 100 and 500 nanometers; and the particle diameter is relevant to reaction temperature, PH value, dosage of a reducer, reaction time and an added surfactant.