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以氯化镉和硫代硫酸钠溶液为电解液,应用循环伏安法,直接在氧化铟锡(ITO)导电玻璃表面电沉积制得硫化镉(CdS)纳米粒子.采用扫描电镜(SEM)和紫外一可见吸收光谱对制得的硫化镉的形状、大小、密度进行表征.在电镀液为0.1MCdCl2和0.02MNa2S2O3,电位范围为-0.2V～-0.8V.沉积40圈,温度50℃条件下,制得的CdS纳米粒子大小均匀,分散性好,平均粒径约为60nm,并用制得的ITO/CdS电极研究了对甲基橙溶液(MeO)的光电催化性能.结果表明,光照条件下,电流增加1约62%. 相似文献
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钟永科 《遵义师范学院学报》2008,10(4)
以氯化锰、甘油与六次甲基四胺为原料进行发泡制得锰酸酯前驱物,经高温热分解前驱物制得了纳米γ-Mn2O3块体,使用XRD和SEM对块体进行了表征。结果表明：发泡有机前驱物在450℃弗炉中焙烧2．0h得纳米γ-Mn2O3块体,块体由200nm左右粒子堆积构成二级粒子,二级粒子由粒径为8．3nm的纳米粒子构成。 相似文献
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初步研究了GAS技术在PCS纳米微粒制备上的应用.着重研究了不同溶剂体系与超临界CO2的相互作用及其对超临界CO2气体抗溶剂结晶过程的影响,对平衡时间及初始浓度对所得纳米粒子粒径和粒径分布的影响进行了探索性研究,获得了粒径20～60 am,分散度小于0.5的PCS纳米粒子. 相似文献
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《廊坊师范学院学报(自然科学版)》2015,(3):26
本发明涉及一种聚合物基微/纳米填料填充改性复合预混料颗粒制备方法,其制备步骤:将非水溶性聚合物基体溶解于第一水溶性溶剂中得均质聚合物溶液;将微/纳米填料分散于第二水溶性溶剂中,经搅拌、加热、超声、添加增溶剂或偶联剂得均质微/纳米填料分散液;将均质微/纳米填料分散液加至均质聚合物溶液中,混合均匀得均质溶液;并将其呈液滴状滴入装有去离子 相似文献
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目的研制基于SolutolHS纳米乳体系,并对其理化性质作出初步评价。方法采用滴加水法制备纳米乳,考察纳米乳的粘度、pH值、粒径、粒径分布、ξ电位、电导率和稳定性。结果制备出SolutolHS纳米乳体系粒径均在20~30nm之间,性质稳定。结论 SolutolHS纳米乳体系性质优良,含表面活性剂少,可用于疏水性药物的载体。 相似文献
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《东南大学学报》2015,(4)
为了研究催化剂粒子直径对丁烯催化氧化制丁二烯体系铁酸盐催化剂内外扩散的影响,建立了介观和微观的多尺度模型.将该模型有效化后用来研究催化剂直径对粒子内流场的影响.模拟结果显示:所有组分的质量分数梯度、温度梯度和压力梯度随着粒子直径增大而变大,表明增大粒子直径会使内扩散阻力增大、使内扩散越显著.在不同粒径的催化剂下,组分外扩散传质阻力是一个常数,粒径对粒子组分的外扩散影响不大.随着粒子直径增大,粒子外表面温度增加,即外扩散传热阻力增大.此外,催化剂粒径的变化会影响丁烯催化氧化制丁二烯反应的选择性,选择合适粒径的催化剂能够优化反应过程和提高目标产物丁二烯的产率. 相似文献
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Nanosized TiO2 particles,synthesized by microemulsion-mediated method,were characterized by XRD,TEM,EDS and BET.To judge the activity of TiO2 particles,the photocatalytic destruction of phenol in areated suspension was studied.The result shows that the photocatalytic activity of lab-made nanometer anatase TiO2 is comparable to or higher than that of commercial titania perticles.The effects of smoe processing parameters such as TiO2 content,oxygen flow rate,pH value on phenol removal were also investigated.The experimental results indicate that there is an optimum value for the TiO2 content,Sufficient O2 supply is needed, but too high gas flow rate induces large bubbles that eliminate the gas residence time and the gas/liquid contact interface,The pH value of the phenol solutions has a complex effect on the photocatalytic activity of the particles. 相似文献
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以间歇碳化法制备纳米碳酸钙的工艺为基础,以压电超声波辅助合成为方法,以实现工业化生产优质的纳米碳酸钙为目的,确定了超声辐照下纳米碳酸钙的合成反应罐结构及合成装置系统的设计,并探讨了超声波辐照下工艺过程各影响因素与纳米碳酸钙粒径的关系。图示了反应体系的传热、传质效果及与粒径的关系。结果表明,影响压电超声在碳化法合成纳米碳酸钙的粒径主要因素有料浆初始温度、C a（O H ）2乳液浓度、C O 2的流量。在自制的装置中,制备出10～30nm 优质的纳米碳酸钙产品,为纳米碳酸钙粉料的生产提供了另种方法。 相似文献
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The preparation of nanometer γ-Fe2O3 through an electrochemical process was studied at room temperature, using a metal iron plate as sacrificing anode and a sheet of stainless steel as cathode, in non-aqueous mediate containing ( Bu)4 NBr as support electrolyte and 2 % (vol % ) water. The powdery particles obtained were then calcined at 300 ℃. The products were characterized by IR, XRD,SEM, TEM and laser particle size analyser, indicating the fine particle is a pure nanometer γ-Fe2O3. The morphology is like coneshaped and their average size is 22.0 nm. Furthermore the VSM spectrum shows that the particle's coercivity (3.9 × 103 A/m) is rather small, presenting the excellent super-paramagnetism. 相似文献
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Ultrafine γ-Al2O3 particles are synthesized in Triton X-100/n-hexanol/cyclohexane/water water in oil(w/o) microemulsion by mixing two separately prepared microemulsions containing Al(NO)3 and (NH4)2CO3 respectively. The ultrafine Al2O3 particles are characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD) and their size and distribution
are measured. The effects of water, surfactant and reactant concentrations on the particle size and distribution are studied.
The results show that the particle size and distribution can be changed by varying the preparation conditions, and the size
of the microemulsion droplets has a controlling effect on the size of the particles. A possible mechanism of ultrafine particles
(UFPs) prepared by microemulsions is proposed. 相似文献
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Fu-you Tian Lian-feng Huang Li-wu Fan Hong-liang Qian Jia-xi Gu Zi-tao Yu Ya-cai Hu Jian Ge Ke-fa Cen 《浙江大学学报(A卷英文版)》2016,17(2):89-100
The pressure drop over a packed bed with sintered ore particles was studied experimentally. The sintered ore particles were characterized to determine their equivalent particle diameter, bed voidage, and sphericity. The pressure drop experiments were performed on unsorted and sieved particles with various size distributions for a superficial velocity up to 2.4 m/s, covering flow regimes from laminar to turbulent. It was shown that the Ergun equation underestimates the pressure drop for such highly irregular-shaped particles by about 40%. The measured modified friction factor was well correlated to a scaled Ergun equation, which was verified to be valid for the modified particle Reynolds number up to 12 000 toward design and optimization of vertically arranged sinter coolers for waste heat recovery. 相似文献
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邱小香 《渭南师范学院学报》2013,(12):54-58
以抗坏血酸为还原剂,制备了一定粒径的纳米金.所制备的纳米金对葡萄糖与菲林试剂反应有强烈的催化作用,且生成的氧化亚铜微粒在870 nm处的吸光度与葡萄糖含量呈正比.据此,在优化实验条件下,建立了分光光度法检测葡萄糖含量的新方法.该方法灵敏度高、操作简单,可用于葡萄糖的快速检测. 相似文献
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以（NH2）2S2O3／NaHSO3为氧化一还原引发体系，在较低温度下实现了有机硅改性丙烯酸酯（MMA-BA）微乳液聚合，讨论了反应温度、引发剂浓度配比对转化率的影响，利用红外光谱（FTIR）分析了有机硅改性丙烯酸酯共聚物结构，激光光散射仪测试了微乳液的粒径及其分布，并对共聚物胶膜的耐水性、吸水性等性能进行了测试。 相似文献