共查询到18条相似文献,搜索用时 62 毫秒
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介绍了用马尔文激光粒度仪测定4A沸石粒度分布方法,通过实验对比找到了优化的测试条件。此外,据国家标准(QB/T 1768—2003)的规定,电对4A沸石粒度分布进行TN定。通过对比,在经过优化的测试条件下,使用马尔文激光粒度仪测定的粒度分布结果,可以和国标(QB/T 1768—2003)的测试结果相匹配,从而达到实验目的。优化的测试方法容易建立,精密度高,已得到应用,效果良好。 相似文献
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以中国某企业生产的气相氧化法二氧化钛为研究对象,采用马尔文激光粒度仪测定气相氧化法二氧化钛的粒径分布,研究了折射率、吸收率、遮光度对测定二氧化钛粒径分布的影响。结果表明,折射率与物料的晶体结构相关,应根据晶体结构选择合适的折射率;随着吸收率变大,残差值先变小后变大;遮光度大于20%时,平均粒径明显变小,且残差值变大。通过实验,确定了激光粒度仪测定气相氧化法二氧化钛最佳设定参数:折射率为2.71、吸收率为0.1、遮光度为10%,在上述最优条件下测定样品的平均粒径为0.329 μm,粒度分布呈较好的正态分布,通过SEM对粒径分布做表征,结果与激光粒度仪结果一致。 相似文献
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采用Brookhaven 90 Plus型激光粒度分析仪,对超细PETN样品的粒度及粒度分布进行了测试,研究了测试样品制备过程中的影响因素.通过实验得出测试样品制备的最佳工艺条件为:以蒸馏水为悬浮载体,六偏磷酸钠为最佳分散剂,最优间隔振荡时间80 s,最适合的质量浓度是220~300 μg/mL.将最佳条件下的测试结果与样品的SEM照片进行对比,二者吻合较好.此方法可以推广到其他超细炸药的测定. 相似文献
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《化学推进剂与高分子材料》2016,(2):79-82
探讨折射率、遮光度、样品质量、采集时间、泵速等因素对铝粉粒度测定的影响,确定了测定铝粉粒度的最佳条件,即折射率为2.5,遮光度在10%~20%之间,采集时间20 s,泵速2 000 r/min,水为分散介质,加入6 m L质量浓度为4 g/L的六偏磷酸钠作分散剂。激光粒度仪测得结果与扫描电镜表征结果基本一致。该方法具有较高的准确性和数据重现性。 相似文献
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激光粒度仪测定PTA粒径分布 总被引:4,自引:0,他引:4
介绍了激光粒度仪测定PTA粒径分布的分析方法 ,通过试验确定了分析条件 ,并与筛分法分析结果进行了对比。该方法简捷、快速、重现性好 ,适用于PTA产品的粒度分析。 相似文献
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大粒径硅溶胶在涂料、化学机械抛光、催化剂载体等工业领域中都有着极其广泛的应用。在添加适量催化剂的条件下,采用单质硅粉氧化法制备了大粒径溶胶。重点介绍了大粒径硅溶胶的分类、性质及应用,通过研究不同条件下大粒径硅溶胶的粒径增长过程分析了大粒径硅溶胶制备过程中的粒径增长机理。在添加阴离子表面活性剂的条件下,采用浓缩蒸馏实验研究了大粒径硅溶胶粒径增长与其浓度的关系,结果表明:随着大粒径硅溶胶浓度的增大,大粒径硅溶胶的粒径呈先减小后增大的趋势。最后提出了制备大粒径硅溶胶的粒径控制工艺。 相似文献
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The sintering effect of highly dispersed metals is the reason for the following phenomena: thermal deactivation, particle size effect, separable or non-separable kinetics and the isokinetic relationship ( = compensation effect). A comparison of these phenomena reveals a contradiction which can be reconciled by a new particle size effect. This effect is characterized in the following way: The dependence of specific activity on particle size is always connected with a variation of the activation energy, caused by the particle size distribution. Therefore, this effect is referred to as the partical size and distribution effect, P.S.D.E. This new concept describes all the observed phenomena of the conventional partical size effect. Moreover, it is consistent with similar effects such as non-separable kinetics and the isokinetic relationship. In consequence, the method of isothermal measurement of specific activity is inadequate. 相似文献
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Latex particle size and CPVC 总被引:3,自引:0,他引:3
Monodisperse vinyl acetate/butyl acrylate (85/15) latexes were prepared with particle sizes between 200 and 1200 nm. These were used in a simple paint formulation with TiO2 as the only pigment. Two optical methods were used for determination of the critical pigment volume concentration (CPVC) of these paints. These are specular gloss at an incidence angle of 85 ° and CIE Z (lightness) values of a blue tinted formulation. Both methods gave coincident results for the CPVC as a function of latex particle size. Our data fit the expression X = 1.44Y2.65 where X = number of latex particles/number of pigment particles, at CPVC and Y = diameter of pigment particles/diameter of latex particles. Earlier, Bowell reported the same exponential relation, with a different pre-exponential factor, for acrylic latexes. The common exponent is explained with a model in which the latex and pigment particles assume a condition close to minimum porosity during packing. CPVC reflects the packing of particles during the initial stages of dryness of the latex. The ‘universal’ relation reported here permits facile prediction of the effects of latex particle size on the CPVC and binding capacity in water-based paints. 相似文献