悬浮液进样FAAS法测定土壤样品中微量锰

采用悬浮液进样火焰原子吸收光谱法（ＦＡＡＳ法）测定土壤样品中微量锰；并对样品的粒度、悬浮液的浓度、介质酸度、校正方法及抗干扰等进行了探讨。结果表明，本法简便、快速、准确可靠。     

悬浮进样—石墨炉原子吸收法测定鸡全蛋粉中的铜、铅和镉的研究

直接悬浮进样石墨炉原子吸收法测定铜、铅和隔,样品不用消化,极大地简化了步骤,避免了样品的污染和损失。优化了悬浮液的配方,使鸡全蛋粉的水悬浮液均匀稳定。该法快速、简便、准确,结果满意。     

高能球磨法制备Fe_3O_4超细颗粒过程中转速对其性能的影响

采用高能球磨法制备水基Fe_3O_4磁性颗粒,研究了转速对其研磨效果、粘度、沉降稳定性、样品形貌及流变性能的影响。结果表明:球磨机转速对Fe_3O_4磁性颗粒悬浮液的粘度和沉降稳定性的影响很大。在相同的研磨时间内,随着转速的提高悬浮液中超细颗粒的含量增多,转速为200 r/min,球磨机对物料有很好的研磨效果;悬浮液的零场粘度先增大后减小;悬浮液的沉降率先减小后增大,沉降量是先变少后变多的过程,当球磨机转速定为200 r/min时,所得样品的稳定性最好;磁场强度低于65 mT时,在相同磁场强度下,低转速制取样品的剪切应力较大。磁场强度高于65 mT时,在相同磁场强度下,高转速制取样品的剪切应力较大。     

悬浮液进样-火焰原子吸收光谱法测定茶叶中的微量铬

将茶叶悬浮于琼脂胶体中制成悬浮液 ,直接喷入空气 -乙炔火焰 ,用火焰原子吸收光谱法测定茶叶中的微量铬 ,方法简便、快速、灵敏度和精密度高、测定结果与用灰化法处理样品一致 ,检验表明 ,两种样品前处理方法之间无显著性差异。相对标准偏差为 3.4 %～ 6 .1% ,加标回收率为 95 .7%～ 10 3.8 %。     

高浓度纳米颗粒悬浮液粒径的超声在线测量方法研究

为研究高浓度纳米颗粒悬浮液的粒径分布表征,引入超声谱高浓度颗粒粒径测量理论(核壳模型),同时搭建了一套超声法高浓度悬浮液粒径测量实验装置,并进行理论模型的实验验证,测得体积浓度为10%至30%的纳米铟锡金属氧化物(Indium Tin Oxides,ITO)水性悬浮液的超声衰减,通过数据反演技术最终获取样品的颗粒粒径分布。结果表明:高浓度纳米颗粒悬浮液中声衰减系数随浓度增加但偏离线性递增趋势,与核壳模型数值模拟更接近。同时,粒径反演的结果与高速离心沉降法也较为吻合。     

原子吸收光谱的样品前处理方法进展

概括了常用的原子吸收光谱的前处理技术,重点介绍了最新现代原子吸收光谱前处理技术和这些前处理技术在环境样品、食品样品、人体组织样品和土壤样品分析中的应用。这些新的技术包括,超声波辅助萃取,微波辅助萃取,微波消解,浊点萃取技术,纳米材料运用于萃取技术,非完全消化技术,悬浮液进样法,在线富集等。     

悬浮液涂层法制备γ-Al_2O_3结构化载体的研究

采用悬浮液涂层法在堇青石结构化基体表面涂覆γ-Al2O3制备结构化载体。研究了悬浮液性能对结构化载体涂层负载量、比表面积以及涂层表面形貌的影响,并通过BET、SEM、超声波振动等手段对制备的结构化载体进行了表征。结果表明,悬浮液固体颗粒尺寸越小,悬浮液的粘度越低,制备的结构化载体性能越稳定;悬浮液固含量为25%时,结构化载体涂层有较好的表面性能和抗震性,比表面积由0.0085 m2.g-1增加到20.80 m2.g-1。     

ZetaPlus激光粒度仪测量聚丁二烯胶乳粒径影响因素浅析

通过建立不同浓度聚丁二烯胶乳(PBL)悬浮液与其浊度的对应关系,考察了PBL悬浮液浊度对其粒径测量的影响,同时探讨了样品测量温度及样品稳定时间等测量影响因素,为研发及生产中准确获得PBL粒径测试数据提供一定指导作用。     

SiO2微粉悬浮液的剪切流变行为

利用流变仪对SiO2微粉悬浮液进行稳态剪切和动态剪切实验,通过同轴旋转剪切、小振幅振荡剪切、大振幅振荡剪切3种方式对悬浮液的剪切流变行为进行表征,得到悬浮液结构稳定性的动力学条件及结构破坏条件。结果表明:同轴旋转法可对悬浮液结构稳定性的强弱进行定性判断,非牛顿系数n能够表征悬浮液结构稳定性的强弱;小振幅振荡法可对其强弱进行定量分析,确定了悬浮液的线性黏弾区,获得了悬浮液结构开始破坏、开始流动时的应变和剪切应力;大振幅振荡法实验下,Cox-Merz经验公式适用于SiO2微粉悬浮液,能够确定存储模量为零的状态,进而得到悬浮液结构完全被破坏时所需的剪切应力和剪切速率。     

功能化碳微球构建自组装膜

采用浓HNO3和H2O2对原始CMSs进行表面修饰,使其团聚现象得到改善;以氧化后CMSs作为结构基团,采用垂直沉积法实现CMSs的自组装,得到CMSs薄膜.考察了溶剂、悬浮液pH值、悬浮液浓度和反应温度对自组装的影响.采用场发射扫描电子显微镜和原子力显微镜对产物进行表征分析,结果表明,以NaOH溶液为溶剂配制悬浮液、...     

The pH measurement of concrete and smoothing mortar using a concrete powder suspension

A simple method is presented to determine the pH value of concrete and fine smoothing mortar. The method is based on mixing powdered samples with a solvent and measuring the pH of the suspension. The parameters affecting the result are investigated. The validity of the pH results is tested by comparing the values measured from a suspension of pulverized specimen with the extracted pore solution. Measurements were done by using a pH electrode and by titration. The technique investigated furnishes results with good reproducibility and has been proven feasible. The pH value results of the proposed suspension method could be compared with the results of the extracted pore solution in two normal-strength concretes and the fine smoothing. Sufficient pore solution of the extra-air-entrained concrete and high-strength concrete could not be obtained in the reference method of extraction of the pore solution. The difference between the results of the suspension method and the extraction method was 0.07 pH units on the average with a standard deviation of 0.27 pH units when the powder-to-suspension ratio in the suspension method was 0.5.     

A Rapid Nile Red Fluorescence-Based Method for Triacylglycerol Content in Microspore-Derived Cell Suspension Cultures of Brassica napus

Brassica napus (L. cv Jet Neuf) microspore-derived (BnaMD) cell suspension cultures were used to study the biochemistry and molecular biology of plant lipid metabolism. The cell suspension cultures may also be a potentially useful trait-testing tool for further improvement of oilseed rape, the world’s third largest vegetable oil crop. Nile red fluorescence methods have been used to assess neutral lipid accumulation in microorganisms and mammalian oocytes but have not been established for plant cell suspension cultures. In this study, a Nile red method was established and optimized for triacylglycerol (TAG) content analysis in BnaMD cell suspension cultures. Nile red fluorescence was easily determined in 96-well plates using a 490 nm excitation wavelength and a 595 nm emission wavelength without any significant interference from other cellular components. The lipid content of the cell suspension cultures at different growth stages was determined using a conventional lipid analysis method and the Nile red fluorescence method. There was a strong positive correlation between the Nile red fluorescence and TAG content in the cell suspension cultures. Therefore, the TAG content of BnaMD cell suspension cultures can be rapidly and robustly determined using a Nile red fluorescence-based method that can potentially be adapted for application to other plant cell suspension cultures.     

40%硫磺·多菌灵悬浮剂配方筛选和优化

采用湿法超微粉碎法制备40%硫磺·多菌灵悬浮剂,并通过流点法和优化组合法对润湿分散剂、增稠剂、防冻剂、防腐剂、消泡剂等助剂进行试验筛选,最终确定了优选配方。并对优选配方制备的悬浮剂产品进行性能检测,结果表明产品质量稳定、悬浮率高、析水率低、低温稳定性和热贮稳定性合格、各项指标符合悬浮剂的标准要求。     

Shrinkage and dimensional accuracy of porous ceramics derived from capillary suspensions

Shrinkage and dimensional accuracy are of particular importance for industrial material production. High dimensional accuracy directly lowers finishing works and cost. Capillary suspension processing is a novel, easy method to produce highly porous ceramic materials. Their shrinkage and shape accuracy is investigated during processing using a laser microscope. The total shrinkage is reduced by 20% for capillary suspension compared to pure suspension. This results from an increase in linear shape accuracy for top radii as well as height. The linear shape accuracy is increased by 6% in top radius and by 16% in height by using the capillary suspension phenomenon. We also show that this capillary suspension method is applicable for continuous shaping processes, like extrusion. The combination of an easy, robust processing route with known dimensional accuracy and applicability for continuous shaping processes makes this capillary suspension processing route highly desirable for industrial processes.     

ZnO Agglomeration and Its Effect on the Preparation of a Mixture for Production of Varistors by a Dopant Deposition Method

A suspension mixture for production of ZnO-based varistors is prepared by a dopant deposition method. The effect of deposition conditions (ZnO concentration in the suspension and the use of a thinning agent) on the density, ZnO grain size, and electrical characteristics of ceramics prepared from the deposited suspensions is studied. Properties of ceramics prepared by the suspension method are compared to those of ceramics prepared by conventional methods.     

搅拌槽中固液悬浮及其放大的研究

研究了具有盘管、碟形底和斜叶涡轮固液悬浮搅拌槽的放大规律。试验用槽径（外径）分别为０．２ｍ、０．５ｍ和１．０ｍ的三个有机玻璃搅拌槽。用激光法测定悬浮液浓度。得出离底悬浮及均匀悬浮时搅拌转速和比功率的经验关联式，与测定槽内轴向速度分布所导出的均匀悬浮方程相吻合，并表明槽径的放大指数主要由循环流数所决定。     

基于动态光散射下纳米二氧化硅分散性的影响因素研究

纳米二氧化硅是目前应用最为广泛的一种纳米材料,但其团聚行为对粒径测量和应用效果有不利的影响。为减少纳米二氧化硅颗粒的团聚行为,应用动态光散射粒度分析方法,考察了分散方式、分散剂种类、悬浮液条件对不同纳米二氧化硅的粒径及多分散性指数（PDI）的影响规律。实验结果表明,磁力搅拌条件下,0.1%（质量分数）的PEG-2000对各类纳米二氧化硅均具有较好的分散效果;随着悬浮液pH增大,硅溶胶悬浮液粒径和PDI均呈下降趋势,是因为悬浮液pH影响了硅溶胶的溶解平衡;而固态二氧化硅悬浮液的粒径和PDI则呈先上升后下降的趋势,这是由于悬浮液pH影响了双电层结构。实际测试和应用中应注意悬浮液配制条件和纳米二氧化硅类别对粒径和PDI的影响。     

DRYING OF Y-Ba-Cu-O COMPLEX OXIDE SUSPENSION BY SUPERCRITICAL CARBON DIOXIDE

Fine and homogeneous powders of Y-Ba-Cu complex oxides are necessary to improve the quality of YBCO bulk high temperature superconductors. The powders which contain BaCO₃ must be sintered for producing YBCO super-conductors at temperature above 850 °C. Therefore, complex oxide is desired. In order to prepare fine complex oxides powders, suspension was synthesized by simultaneous hydrolization of 2-propanol solution of metal isopropoxides. However, the suspension was not dried by a hot air drying method, because aggregation occurs due to cohesion of particle along with evaporation. Also, the suspension could not be freeze-dried, because the freezing point of 2-propanol is -88.5°C. So, supercritical fluid drying method using supercritical carbon dioxide was applied. The results from these experiments suggest that this method is useful for drying of the suspension prepared by the alkoxide route.     

以油酸甲酯为介质10%双草醚可分散油悬浮剂的制备

[目的]制备以油酸甲酯为介质10%双草醚可分散油悬浮剂的配方。[方法]采用控制变量法.黏度曲线法.以常温、冷贮及热贮条件下的稳定性、悬浮率、析油率等为指标,对乳化剂、分散剂、增稠剂的种类及用量进行筛选。[结果]最终确定配方为双草醚10%,VO-02N 19%,SP-OF34981,8%,ODGel-051.6%,SK-040.7%,油酸甲酯补足至100%。[结论]该配方析油率低,稳定性高,悬浮率高,冷热贮等指标均符合可分散油悬浮剂标准.