Papers by Keyword: Preparation

Abstract: In this study, the preparation method of the film-forming amine emulsion is explored by changing the sequence of different reagents, OLDA concentration, experimental temperature and OLDA/cyclohexylamine ratio. The stability of the film-forming amine emulsions prepared under different conditions is studied by observing if the emulsion delamination occurred after standing for several days. Results indicate that the sequence of different reagents, OLDA concentration, experimental temperature and OLDA/cyclohexylamine ratio affect the formation and stability of the film-forming amine emulsion obviously. The maximum content of OLDA in the film-forming amine emulsion could reach to 1.5 wt%, OLDA/cyclohexylamine ratio could be changed from 1:1 to 1:2.5, and room temperature could be as the experimental temperature. The stable film-forming amine emulsion could be prepared under the optimal conditions.

Abstract: Graphene(Gr) reinforced copper matrix composites(Gr/Cu) were prepared by powder metallurgy process, and the effects of graphene content on microstructure and properties of the composites were investigated. The microstructure, density, hardness and electrical conductivity of the composites were analyzed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), density measurement, hardness tester and conductivity meter. The results show that the interface bonding of the composite is good, there is no crack and no obvious interface reaction; there are a lot of dislocations and twins in Cu matrix. With the increase of graphene content, the density, heat capacity and thermal conductivity of the composites decrease, but the hardness increases first and then decreases.

Abstract: A novel polycarboxylate superplasticizer (PCE) with energy saving preparation was elaborately designed and synthesized by using acrylic acid (AA), hydroxypropyl acrylate (HPA) and isopentenyl polyethylene glycol (IPEG) as monomers. To investigate the effects of the preparation method on the effectiveness of PCE, the PCEs were prepared from energy-saving method and common method respectively, and the hydration heat evolutions of the cement pastes containing these PCEs were comparatively probed. Furthermore, the working mechanisms of the PCEs by different preparations were identified via adsorption behavior, adsorption kinetic and Zeta potential of the PCE on cement surfaces. The results showed that, this novel PCE prepared in an energy saving manner can significantly prolong the hydration process and present a stronger adsorption capacity. In addition, the adsorption of this PCE on cement surface exhibited a characteristic of pseudo first order kinetic equation model. The evaluation in energy conservation showed that, this energy saving preparation can save 1.548×10⁴ kJ per 10 ton production. The aim of this study is to provide a new avenue to synthesize a PCE with economical method which achieves energy-saving preparation. Due to the indispensable application in construction industry, the innovations from this study contribute to the low energy-consumption production and high eco-effectiveness of the novel PCE, which has potential applications in low-emission building materials.

Abstract: The possibility of preparation of hybrid nanocomposites, based on Burdock Arctium Lappa L biomass, modified with enzymes and montmorillonite, was substantiated. It was founded that bio-modification allowing releasing pectin into the biomass Burdock structure that allow fixing clay mineral particles onto biomass. It was found that the increase of pore spaces occurs at the expense of increasing mesopore spaces to 93 %. It allows increasing the adsorption capacity of hybrid nanocomposites to zinc ions and methylene blue to 52.2 and 166.9 mg g^-1 respectively; that is 3.5 and 9 times more than adsorption capacity for initial plant Burdock

Abstract: Sorangium cellulosum can product many secondary metabolites that is unique structural and makes these microorganisms highly attractive for drug development, especially epothilone, on cancer cells a cytotoxic macrolide which is naturally produced by Soxhlet cellulose that have the action of microtubule stabilization, is a promising anticancer drug. In this research, the factors affecting the regeneration and preparation of the protoplast of Sorangium cellulosum were discussed, those were regeneration media, enzymes and osmotic stabilizers. This study provide the distruction for improving the production of epothilone through genome shuffling, mutation, fusion and transformation.

Abstract: A new triazine charring agent, melamine formaldehyde resin modified with pentaerythritol (named as MF-MPOL), was synthesized through hydroxymethylation, condensation and etherification by using melamine, paraformaldehyde and pentaerythritol as raw materials, and characterized by solid-state ¹³C NMR and FT-IR. The intumescent flame retardant (IFR) consisting of MF-MPOL with ammonium polyphosphate has good flame retardancy in polypropylene (PP). The analysis of the residues obtained in cone calorimetry test showed that the IFR played a role of flame retardancy mainly in condensed phase. In other words, the porous and dense - continuous intumescent char layer formed during the burning process results in flame retardant effect by insulation of heat, oxygen and preventing the underlying PP from degradation and volatilization of pyrolytic products.

Abstract: The hydrogenation of CO₂ to CH₄ can realize the utilization of CO₂, which has an important implications to both the energy and environment. As a result of the low catalytic activity of the supported Ni/SiO₂ catalyst, the ZrO₂ is added to improve its catalytic performance by the impregnation method. The experimental results show that ZrO₂ is an effective promoter to enhance the low-temperature catalytic activity of Ni/SiO₂ catalyst.

Abstract: Calcium silicate hydrate gel (CSH) was synthesized by calcium acetate and sodium silicate. The structure and morphology of CSH were characterized by X-ray diffraction analysis, Fourier transform infrared spectroscopy and Scanning electron microscopy. The adsorption performance of CSH was measured by static adsorption method. The results show that CSH has porous structure and large specific surface area, and the optimum reaction conditions is the reaction temperature of 25°C and calcium-silicon ratio of 1.2. It has the maximum adsorption capacity of more than 150 mg/g and the removal rate of more than 86% with Cu²⁺. And it shows the excellent adsorption performance, even when the concentration of Cu²⁺ is less than 200mg/L, the removal rate is above 90%. The research may provide a low-cost and high-efficiency adsorbent.

Abstract: Preparation, microstructure and mechanical performance of novel supplementary cementing materials prepared with electroplating sludge and steel slag as raw materials were studied. It was found that the electroplating sludge could be mixed with steel slag at appropriate ratios to make SCMs that posse certain compressive strength. The results shows that the supplementary cementing materials prepared in this article can increase the compressive strengths of cement when it substitutes for cement in appropriate proportion. The microstructure and hydration products of cement with SCMs were examined by XRD and SEM. The results indicated that the content of calcium hydroxide formed in paste significantly reduced and Aft increased, as the content of the supplementary cementing materials increased. In addition, the heavy metals elements in the electroplating sludge could be effective cured in cement pastes and reduced the pollution to the environment.

Abstract: Phosphorus scale inhibitor is a kind of agent which can disperse insoluble inorganic salts in water, prevent or interfere with the precipitation and scaling of insoluble inorganic salts on metal surface, and maintain better heat transfer effect of metal equipment. Sodium triethylenetetramine hexamethylphosphonate (TETHMPS) and tetraethylenepentamine heptagon methylene phosphonic (TEPHMPS) were prepared by one-step synthesis method. The effects of temperature, concentration and mixing ratio on scale inhibition were investigated. The results showed that as the concentration of TETHMPS and TEPHMPS increases, the scale inhibition rate increases. At the same temperature, compared with TETHMPS, TEPHMPS has better scale inhibition performance, and the maximum scale inhibition rate can reach 93.59%. The scale inhibition rate of the synthesized scale inhibitor at 80 °C is better than that at 60 °C. The scale inhibition performance of the compound scale inhibitor is better than that of the single scale inhibitor, showing an ideal synergistic effect. When the concentration is 60 mg/L, the scale inhibition rate of TETHMPS is 94.26%, TEPHMPS is 94.55%, and the scale inhibition rate is above 91%.