分散剂在超细重钙粉制备中的作用

研究了 p H值调节剂氨水和分散剂六偏磷酸钠在超细重钙粉制备中的协同作用效果。试验结果表明 ,p H值调节剂氨水协同分散剂六偏磷酸钠对超细重钙粉的制备具有显著的助磨作用 ,在球料比为 2 ,矿浆浓度为 5 5 % ,采用Φ 6 mm氧化锆球作磨矿介质 ,研磨 4 h的工艺条件下 ,当0 .1mol/L氨水用量为 0 .4 %～ 0 .6 % ,六偏磷酸钠用量 0 .5 %～ 0 .7%时 ,可缩短磨矿时间 ,提高磨矿效率 4 0 %左右     

Cr3C2-25%NiCr料浆中分散剂含量对其喷雾干燥粉末性能的影响

通过添加高分子分散剂配制Cr3C2-25%NiCr料浆,喷雾干燥制备出高球形化的Cr3C2-25%NiCr复合粉末。利用SEM研究了分散剂含量对喷雾干燥制备的Cr3C2-25%NiCr复合粉末性能的影响,结果表明:分散剂能够调节料浆性能,粉末的流动性及松装密度明显提高,其中0.04%含量的分散剂所制备的Cr3C2-25%NiCr粉末具有最佳的物理性能。     

Fe3O4 spinel-Mn3O4 spinel supercapacitor prepared using Celestine blue as a dispersant,capping agent and charge transfer mediator

An asymmetric spinel-spinel supercapacitor is fabricated with negative and positive electrodes respectively consisting of Fe₃O₄ and Mn₃O₄ nanoparticles, where carbon nanotubes (CNT) serve as conductive additives. High performance of the individual electrodes and devices is achieved at a high active mass (AM) loading of 40 mg cm⁻² of the individual electrodes. We implement a conceptually new strategy using multifunctional Celestine blue (CB) dye, which is strongly adsorbed on the spinel phases and CNT, facilitates dispersion, acts as a capping agent and allows for the fabrication of spinel decorated CNT. CB is an efficient charge transfer mediator, which allows for significant improvement of capacitive behavior. The use of CB as a charge transfer mediator allows for good utilization of capacitive properties of spinels at high AM. Mechanisms of spinel-CB-CNT interactions and charge transfer mediation are discussed. The capacitive properties of electrodes with different spinel/CNT mass ratios are tested by cyclic voltammetry, chronopotentiometry and impedance spectroscopy. The areal capacitances of 6.17 and 5.15 F cm⁻² are obtained for Fe₃O₄ and Mn₃O₄ based electrodes, respectively in 0.5 M Na₂SO₄ electrolyte. The high capacitances are achieved for the electrodes that have low resistance. Using these electrodes, an asymmetric device is fabricated that has a capacitance of 2.41 F cm⁻² in a voltage window of 1.6 V.     

油井水泥分散剂SXY在吐哈油田的应用

本文结合吐哈油田固井作业，研究了分散剂ＳＸＹ对水泥浆流变性、析水的影响，并就ＳＸＹ与其它外加剂的配伍性做了评价实验。文章认为：ＳＸＹ是一种高效、抗温型的水泥浆分散剂。     

不同分散剂对纳米铁粉分散性能的影响

通过对直流氢电弧蒸发法制备的纳米铁粉Zeta电位的测量,选用非离子型和阴离子型2类分散剂,分别研究了油酸、聚乙烯吡咯烷酮（PVP）和十二烷基苯磺酸钠（SDBS）3种分散剂对纳米铁粉分散性能的影响.结果表明：超声时间、分散剂加入量及pH值对分散效果影响显著,随着超声时间和表面活性剂加入浓度的提高,粉体分散效果呈先增大后减小的趋势;PVP和油酸对纳米铁粉的分散效果较好,分散剂分散效果从高到低顺序依次为：PVP＞油酸＞SDBS;推荐最佳分散工艺：无水乙醇作为溶剂,超声功率560 W,超声时间15 min,pH等于10,PVP加入量4%.     

Electrophoretic deposition of functional organic molecules and composite films

2,2′-Bicinchoninic acid (BiqCOOH) exhibits a set of functional properties, which motivated the work of fabricating BiqCOOH films. Thin films of BiqCOOH were prepared potentiodynamically or under constant-voltage conditions from the solutions of dipotassium salt of 2,2′-bicinchoninic acid (BiqCOOK) in water or ethanol-water solvent. Electron microscopy investigations showed that the electrochemical assembly of BiqCOOH in aqueous solutions resulted in fibrous morphology while a flower-like morphology, containing rectangular prism-shaped particles, was the result in ethanol-water solutions. The anodic deposition mechanism for BiqCOOH has been proposed based on the analysis of cyclic voltammetry (CV), electron microscopy and FTIR data. The polyaromatic BiqCOOK molecules, containing chelating ligands, showed adsorption on a range of different materials, such as Pd, NiO and multi-walled carbon nanotubes (MWCNT). An electrophoretic deposition (EPD) method allowed for the manufacturing of Pd, NiO and MWCNT films using BiqCOOK as anionic dispersing and binding species. The results of this investigation have generated new possibilities in creating individual material and composite films for applications based on their functional properties.     

一种新型的腐植酸系水煤浆分散剂的制备及性质研究

实验采用直接酯化法,以马来酸酐和聚乙二醇600先酯化合成酯化单体,再以腐殖酸、甲基丙烯酰氧乙基三甲基氯化铵和酯化单体为原料,以过硫酸钾为引发剂,采用水溶液自由基接枝共聚原理,合成出了一种新型的两性离子型腐殖酸分散剂(HDM)。通过红外光谱对接枝共聚产物的分子结构进行了表征。将其作用于榆林煤制浆,考察了单体配比、引发剂用量、反应温度等对水煤浆性能的影响。最佳工艺条件为:m(MAPEG-600)/m(HA)=2.5:1,引发剂KPS用量为HA和MAPEG-600总质量的6.0%。结果表明,HDM相较于市售的木质素磺酸钠有更好的稳定性。     

Morphology control of mesoporous Cu2O by reductants and its photocatalytic activity

Mesoporous Cu₂O particles with different morphologies were synthesized via simple one-pot reactions. Effects of reducing agents, dispersant, template, and temperature on the structure of the prepared materials were investigated. Mesoporous flower-shaped Cu₂O materials were obtained at 70 ℃ using glucose as a reductant. Different hollow microsphere shapes of Cu₂O could be prepared at 40 ℃ using another type of reductant, ascorbic acid. The results indicated that the uniform morphology of synthesized Cu₂O with mesopores presented a maximum specific surface area of 45.3 m²/g. Furthermore, the as-prepared Cu₂O particles showed good photodegradation efficiencies of methyl orange in the range of 86.0–93.7%, depending on their morphologies.     

丙烯酰胺反相悬浮聚合分散剂的研究

研究了非离子型表面活性剂(Span系列和Tween系列)种类和用量对丙烯酰胺(AM)反相悬浮聚合体系的稳定性及平均粒径的影响,发现由S—65和S—40构成的复合分散剂,且当HLB值为4.5时,分散体系的稳定性最好,产率出现最大值,分散液滴的直径出现最小值。     

JA-281对高铝泥浆流变性能的影响

本文主要探讨在高铝泥浆制备过程中，选用不同解凝剂（ＪＡ－２８１，阿拉伯树胶、水玻璃、碳酸钠）的原则，通过对泥浆粘度、稠化系数、吸浆速度等参数的测定，来探索单一添加和复合添加ＪＡ－２８１对高铝泥浆流变性能的影响及其解凝机理。