共查询到20条相似文献,搜索用时 93 毫秒
1.
2.
3.
纳米ZnO/ZnOw/HDPE抗菌性能及力学性能研究 总被引:1,自引:0,他引:1
研究了氧化锌晶须(ZnOw)对纳米ZnO/HDPE(高密度聚乙烯)抗菌性能的影响,并对制备的抗菌塑料表面形貌、力学性能等进行表征。结果表明,纳米ZnO/ZnOw/HDPE复合抗菌塑料的抗菌效果优于纳米ZnO/HDPE抗菌塑料的,添加ZnOw的复合抗菌材料在抗菌剂质量分数为2%时,对大肠杆菌的抗菌率已达到99.9%,相当于纳米ZnO的添加量为1.4%时,抗菌率即可达到99.9%。ZnOw可有效改善纳米ZnO的表面分散状态,并且复合抗菌剂的添加对材料的力学性能没有影响。 相似文献
4.
5.
喷雾分解法制备高活性氧化锌 总被引:2,自引:0,他引:2
研究了用喷雾分解、干燥法由低品位氧化锌制备活性氧化锌的工艺。实验结果表明,低品位氧化锌矿经碳酸氢铵、氨水与水的质量比5:8:14的浸取液浸取,浸取率为94.67%。浸取液中的氧化锌含量可达23.3%(质量分数),用锌粉除杂净化,过滤除去杂质。滤液在喷雾干燥塔430oC的入口温度下喷雾热分解,再经过400℃下的流化床处理9min,可得到含量为99.5%z(质量分数)高活性的氧化锌。其吸碘值为87.96mg/g,活性显著高于蒸氨煅烧法所得的氧化锌,是一种新的高活性氧化锌的制备方法。 相似文献
6.
7.
8.
9.
以碳酸钠和硝酸锌为原料,采用高温固相煅烧热分解方法制备高纯度纳米氧化锌。通过滴定分析了产物的纯度,结合产物的中位粒径测试,确定了高纯度氧化锌制备的煅烧温度。通过对特定煅烧温度下产物的X射线衍射(XRD)、红外光谱(IR)、激光粒度、乙二胺四乙酸二钠滴定分析,阐述了高纯度纳米氧化锌形成机理。研究表明,碱式碳酸锌在煅烧温度高于200℃时可以完全分解,随着温度进一步升高,产物的纯度逐渐升高;当煅烧温度高于400℃时,产物的纯度大于95%,满足GB/T 19589—2004《纳米氧化锌》3类的要求;当煅烧温度为600℃时,产物中位粒径最小(345 nm);热分解法制备高纯度纳米氧化锌,经历了碱式碳酸锌分解为氧化锌、二氧化碳、水和在不同煅烧温度下建立氧化锌、二氧化碳、水的吸附-脱附平衡两个物理化学过程。 相似文献
10.
浙江大学开发出一种纳米水滑石和纳米氧化锌复合改性聚氯乙烯树脂的制备方法。将1-10g的纳米水滑石和纳米氧化锌(纳米水滑石和纳米氧化锌的质量比为5/1-1/5)加入到含0.05-0.5g分散剂的50 g去离子水中,超声或高速剪切分散10-60 min,得到纳米水滑石和纳米氧化锌复合分散液;将以上纳米水滑石和纳米氧化锌复合分散液、0.05-0.50 g引发剂、0.05-0.5 g分散剂、100g氯乙烯、100-200g去离子水加入到聚合釜中,搅拌10-60min,升温至45~65℃进行聚合反应,至体系压力下降0.5-2.5kg/cm^2时,结束聚合,脱除未反应氯乙烯,出料、过滤、干燥得到纳米水滑石和纳米氧化锌复合改性的聚氯乙烯树脂。 相似文献
11.
乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
12.
D. G. Gordeev L. F. Gudarenko M. V. Zhernokletov V. G. Kudel’kin M. A. Mochalov 《Combustion, Explosion, and Shock Waves》2008,44(2):177-189
A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation
of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from
the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO2) of density 0.08 g/cm3.
__________
Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008. 相似文献
13.
15.
16.
Jorge Marcelo Romero Soledad Bustillo Hugo Enrique Ramirez Maisuls Nelly Lidia Jorge Manuel Eduardo Gómez Vara Eduardo Alberto Castro Alicia H. Jubert 《International journal of molecular sciences》2007,8(7):688-694
A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out. 相似文献
17.
18.
19.
A perturbation viscometer is a differential capillary viscometer that measures the logarithmic viscosity gradient of the viscosity-composition curve for gas mixtures. Measurements are made at different gas mixture compositions. Integration of the logarithmic viscosity gradients measured over the full composition range gives the mixture viscosity relative to the viscosity of one of the pure components of the gas mixture. This method is attractive because, for measurements of equal precision, integration of the gradients is potentially an order of magnitude more precise than measurement of the viscosities directly. It can also work at high and low temperatures and perhaps high pressures.The perturbation viscometer has been used to make measurements on ideal gas mixtures at ambient and elevated temperatures. The situation is more complicated when the gas mixtures are non-ideal. Extra effects due to density differences, molar volume change on mixing and differential thermal expansion may be measured in addition to the desired viscosity change producing systematic errors in the results. Thus, a more sophisticated apparatus is required. The standard perturbation viscometer has been modified to separate out the extra effects to permit measurement of the true change in viscosity. In addition, the theoretical operation of the modified apparatus has been revised to account for the design changes to permit calculation of the viscosity-composition profiles from the results.The apparatus has been tested using helium-HFC-125 mixtures and two new viscosity-composition profiles are presented for these mixtures at 23 and . Internal consistency tests have been used to confirm that the data produced are of high quality with an estimated uncertainty in the viscosity ratio data at of 0.9% and at of 1.5%. 相似文献
20.
塔设备改造选型的分析 总被引:2,自引:0,他引:2
就当前扩产增容中塔设备设计和改造时板式塔和填料塔的选型问题加以分析。在评述目前国内常用的几种塔板和新型填料之后,着重介绍一种新型塔板(导向梯形浮阀塔板)和一种新型填料(波环填料——乾隆帕克)。 相似文献