共查询到17条相似文献,搜索用时 171 毫秒
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活性碳纤维(ACF)是一种多孔材料,它可以通过物理或化学的方式从液体或气体中吸附多种成分,因此被用于许多应用中,特别是污染气体的净化、有毒气体的吸收、气体的分离、空调的除臭和水的净化等,ACF还可应用于医药领域。活性碳的另一种类粒状活性碳(GAC)同样可应用于以上各领域。尽管ACF的价格很高,但ACF的使用却更为广泛,这主要是因为其蓬松度大、孔径均匀,使它的吸收量和传质系数比粒状活性碳高12~15倍。原材料性能及碳化与活化工艺影响最终ACF的微孔数量和总表面积。由聚丙烯腈(PAN)原丝制得的ACF有着独特的吸收性能和相当高的强度。 相似文献
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对翡翠的表面结构进行了定义,主要分析了其机械(热)动力作用后形成的物理表面结构——“硬结构”特征与溶蚀一交代作用后形成的化学表面结构——“软结构”特征的区别,初步阐述了利用其表面结构来鉴定、评估翡翠的原则和意义。 相似文献
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Ⅱ表面结构研究的物理方法(上) (一)前言 各种方法的评论 众所周知,不论是羊毛角朊纤维还是别的纺织纤维,在将原纤维加工成最终产品的每个工艺阶段,它们的表面结构对纤维的物理行为有着很大的影响,对于纺织产品的使用性能则常常起着更为重要的作用。通常所说的纤维表面结构往往是指原纤维表面层的形态学结构和组织学结构(更完整性,还应该包括化学结构和结晶学结构)。实际上,纺织工艺过程的每个阶段都或多或少的改变了原纤维的表面结构和性能。人们对纤维表面情况的了解不应该只局限于原纤维,而应该包括纺织工艺过程中表面结构的变化情况。… 相似文献
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纳米二氧化钛(TiO_2)是一种理想的环境治理光催化剂,活性炭纤维(ACF)具有良好的吸附性,用ACF负载纳米TiO_2制备空气净化复合材料,其对于净化空气中的污染源有着显著效果。综述纳米TiO_2/ACF空气净化复合材料的制备方法及其在室内空气净化中的研究进展,介绍纳米TiO_2光催化剂的物理性能和化学性能表征方法,并对今后的研究进行展望。 相似文献
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《中国印刷与包装研究》2012,(3):79
该小组科研人员通过中科院武汉物理与数学研究所波谱与原子分子物理国家重点实验室表面单分子化学物理研究小组,在激光控制微悬臂梁运动研究方面取得新进展。 相似文献
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Volatile organic compounds (VOCs) comprise 67% of total hazardous air pollutants (HAPs) that are emitted by major industrial point sources into the U.S. atmosphere (1). Adsorption by activated carbon fiber (ACF) has been recognized as one of the feasible regenerative control processes to separate and recover VOCs for reuse. Characteristics of VOCs transport in ACFs are required to efficiently design ACF sorption systems. However, extensive resources are spent experimentally obtaining transient sorption data to design adsorption systems. As an alternative, this work develops a new model that predicts effective diffusivities of VOCs into ACFs. The diffusion process is modeled as Knudsen transport into the ACF open pore spaces coupled with activated surface diffusion on the ACF's internal surface area. Temperature and Darken's factors are included in the surface diffusion model to provide corrections for thermodynamic state and deviation from Fick's Law, respectively. Depth of the adsorption potential well is considered as the product of the heat of adsorption of a reference VOC, an adsorption similarity factor, and a surface diffusion energy factor. Introduction of the adsorption similarity factor in the effective diffusivity model is a new concept providing a means to predict effective diffusivity of similar adsorption systems from a reference system. Experimental data from a short length column are used to determine effective diffusivity of acetone in ACF. Results from this diffusivity model are compared to experimental values for the acetone/ACF system to describe the degree of closure between modeled and experimental results. 相似文献
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Antimicrobial effect of silver particles on bacterial contamination of activated carbon fibers 总被引:2,自引:0,他引:2
Even though activated carbon fiber (ACF) filters have been widely used in air cleaning for the removal of hazardous gaseous pollutants, because of their extended surface area and high adsorption capacity, bacteria may breed on the ACF filters as a result of their good biocompatibility; ACF filters can themselves become a source of bioaerosols. In this study, silver particles were coated onto an ACF filter, using an electroless deposition method and their efficacy for bioaerosol removal was tested. First, various surface analyses, including scanning electron microscopy, inductively coupled plasma and X-ray diffraction were carried out to characterize the prepared ACF filters. Filtration and antimicrobial tests were then performed on the filters. The results showed that the silver-deposited ACF filters were effective for the removal of bioaerosols by inhibition of the survival of microorganisms, whereas pristine ACF filters were not. Two bacteria, Bacillus subtilis and Escherichia coli, were completely inhibited within 10 and 60 min, respectively. Electroless silver deposition did not influence the physical characteristics of ACF filters such as pressure drop and filtration efficiency. The gas adsorptive ability of the silver-deposited ACF filter, as represented by the micropore specific surface area, decreased by about 20% compared to the pristine filter because of the blockage of the ACF micropores by silver particles. Therefore, the amount of silver particles on the ACF filters needs to be optimized to avoid excessive reduction of their adsorptive characteristics and to show effective antimicrobial activity. 相似文献
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印刷纸张表面整饰加工技术研究进展 总被引:1,自引:0,他引:1
李志健 《中国印刷与包装研究》2012,4(2):1-8
印刷品的质量与纸张表面特性有着密切的关系.纸张表面通过加工整饰后具有良好的平整度、吸墨性等特点,明显提高了纸张的印刷适性,而不同的纸张表面整饰加工技术,会不同程度地改变纸张表面的物理结构或者化学组成,从而改变纸张的印刷适性.本文介绍了压光、表面施胶、涂布三种主要的纸张表面整饰加工技术及其新进展,重点分析研究了采用不同整饰加工技术后纸张表面结构的变化特点,为印刷生产中印刷用纸、生产工艺及加工参数的选择提供参考. 相似文献