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YE Wenting 《等离子体科学和技术》2010,12(5):614-618
Chitosan (CTS) coatings contained calcium (Ca) and phosphorus (P) on titanium (Ti) surface are prepared by the cathode liquid phase plasma technology (CLPT), in a certain concentration electrolyte solution with selective additions of ammonium dihydrogen phosphate and calcium nitrate. It is indicated that the parameters for a stable discharge are voltage of 400 V, frequency of 100 Hz, duty cycle of 30% based on a large amount of experiment data. The morphology, structure and composition of the coated samples are studied by SEM, FTIR, XRD, XPS. The results demonstrate that the composite coatings are uniform, and some solid particles of inorganic salt containing calcium and phosphorus dispersed on the coatings. CA[请写出全称] tests show that the samples treated by the liquid plasma became less hydrophilic. The variation of hydrophilicity on the CLPT treated titanium is attributed to the change of the function groups on the sample surface. Meanwhile, a possible formation mechanism of the composite coatings is discussed. 相似文献
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To enhance the blood compatibility of Polyvinyl Chloride (PVC) film, the film was modified by SO2/O2 gas plasma treatment. The effect of surface sulfonation of PVC treated by various SO2/O2 gas plasma depended on the volume ratio O2/(SO2 O2). When the volume ratio was 0.5, the effect of sulfonation was the best. Sulfonic acid groups were specifically and efficiently introduced onto the PVC surface, which was proved by X-ray photoelectron spectroscopy (XPS) and Attenuated Total Reflectance Fourier Transfer Infrared (ATR-FTIR) spectroscopy. The surface microstructure of modified PVC film was studied with scanning electron microscopy (SEM). The antithrombogenicity of the samples was determined by the activated partial thromboplastin time (APTT), prothrombin time (PT), thrombin time (TT) and plasma recalcification time (PRT) tests and platelet adhesion experiment. The results indicated that the antithrombogenicity of modified PVC was improved remarkably. 相似文献
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现代计算机网络使我们的生活和工作发生了革命性的变化.互联网日渐渗透到我们工作和生活的每一个角落,互联网、数据库、多媒体、分子模拟等技术的发展,使化学家的工作变得更加方便快捷.作者等就计算机网络技术在陕西师范大学化学与材料科学学院的应用,及笔者的体会对以下两方面的内容做简要介绍和展望:(1)现代网络计算机技术的发展状况;(2)网络计算机技术在高校化学科研和教学中的应用,及其未来的发展方向. 相似文献
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AlPO_4-11和SAPO_4-11分子筛的微波合成及结晶机理研究 总被引:1,自引:1,他引:0
以二异丙胺为模板剂,利用微波辐射法合成了AlPO4-11和SAPO4-11分子筛,考察了合成压力、HF用量对合成AlPO4-11分子筛的影响;利用X射线衍射和扫描电子显微镜对所合成分子筛的结晶度及晶体形貌进行了表征。实验结果表明,利用微波技术合成的具有AEL晶体结构的AlPO4-11和SAPO4-11分子筛结晶度高、晶粒均匀(为长约5μm的棒状晶体)。通过考察晶化时间对合成产物的影响发现,微波合成的AlPO4-11分子筛是由六方晶系的正磷酸铝发生晶相转化而来的。利用X射线能谱对合成的SAPO4-11分子筛表面硅原子的含量进行了测定,并结合吡啶吸附傅里叶变换红外光谱表征结果证实,SAPO4-11分子筛具有B酸和L酸两种酸性位,但由于合成产物表面硅原子含量较少,因此酸性位也较少。 相似文献
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以二异丙胺为模板剂,在乙醇-水体系中合成了纤维状结构的ZrAPO-11分子筛。利用XRD、SEM、N2物理吸附BET和吡啶吸附FTIR等技术对所合成的产物进行了表征。表征结果显示,增大醇水比,ZrAPO-11分子筛的形貌从棒状转变为纤维状;Zr离子的引入有助于分子筛的结晶并改善晶体的形貌;利用HF的配合作用,ZrAPO-11分子筛的形貌也从块状转变为片状,最终转变为纤维状;在醇水体系中HF作用下,ZrAPO-11分子筛的结晶速率明显减缓;所合成的ZrAPO-11分子筛为长度约15μm、宽度50 nm、厚度约10 nm的纳米纤维,比表面积高达397.4 m2/g,并具有较多的B酸中心。 相似文献