The macromolecular structures on nitinol surfaces were prepared by ECR microwave cold-plasma of tetraglyme conditions. The surface chemistry was characterized by high resolution ESCA. The results showed that th...The macromolecular structures on nitinol surfaces were prepared by ECR microwave cold-plasma of tetraglyme conditions. The surface chemistry was characterized by high resolution ESCA. The results showed that the modified nitinol surfaces were built up mainly of -CH2-CH2-O- linkages and were particularly effective in preventing platelet adhesion.展开更多
The synthesis and characterization of PEG-like macromolecular structures on Nit inol surface from tri (ethylene glycol) dimethyl-ether under ECR-cold-plasma conditions were discussed. It was demonstrated that based o...The synthesis and characterization of PEG-like macromolecular structures on Nit inol surface from tri (ethylene glycol) dimethyl-ether under ECR-cold-plasma conditions were discussed. It was demonstrated that based on high-resolution ES CA, ATR-FTIR and contact angle investigations, the deposited PEG-like layers a re composed mainly of -CH 2-CH 2-O- linkages. These structures have a relati vely low contact angle. Compared to the unmodified surfaces, the plasma-treated Nitinol surfaces are more hydrophilic. Plasma enhanced coatings of PEG-like la yers can prevent Ni ion from releasing, thereby improving the biocompatibility o f Nitinol.展开更多
基金supported by the National Natural Science Foundation of China(NNSFC)(Grant No.19972071,50274065)subsidized by the Special Funds for Major State Basic Research Project("973"Project)(Grant No.2002CB412704)
文摘The macromolecular structures on nitinol surfaces were prepared by ECR microwave cold-plasma of tetraglyme conditions. The surface chemistry was characterized by high resolution ESCA. The results showed that the modified nitinol surfaces were built up mainly of -CH2-CH2-O- linkages and were particularly effective in preventing platelet adhesion.
基金Funded by the National Natural Science Foundation of China (No.1997207150274065) and the Special Funds for Major State Basic Research Project (No.2002CB412704)
文摘The synthesis and characterization of PEG-like macromolecular structures on Nit inol surface from tri (ethylene glycol) dimethyl-ether under ECR-cold-plasma conditions were discussed. It was demonstrated that based on high-resolution ES CA, ATR-FTIR and contact angle investigations, the deposited PEG-like layers a re composed mainly of -CH 2-CH 2-O- linkages. These structures have a relati vely low contact angle. Compared to the unmodified surfaces, the plasma-treated Nitinol surfaces are more hydrophilic. Plasma enhanced coatings of PEG-like la yers can prevent Ni ion from releasing, thereby improving the biocompatibility o f Nitinol.
文摘为探究物理场耦合酶解处理对亚麻籽植物乳的影响,本研究首先使用了低温等离子体对纤维素酶进行处理以提高其酶活,并根据酶活变化确定了最佳处理时间,然后使用荧光光谱、紫外光谱、圆二色光谱分析(Circular Dichroism spactra,CDs)对酶结构进行分析,探索其酶活改变机制;其次,研究了低温等离子体(Cold Plasma,CP)或脉冲电场(Pulsed Electric Field,PEF)单物理场协同酶解处理对亚麻籽乳酚类物质溶出及黏度的影响,并根据实验结果确定了PEF最佳处理电压。最后,使用CP(处理时间15 s)、PEF(处理电压3.7 kV/cm)物理双场协同纤维素酶对亚麻籽乳进行处理,探究了物理双场耦合酶解(Cold Plasma and Pulsed Electric Field coupled Enzymatic treatment,CP-PEF-EN)对亚麻籽植物乳总酚含量与黏度的影响。结果表明:使用CP处理纤维素酶时,纤维素酶酶活呈现先升高(15 s,最高89%)后降低趋势,光谱结果显示CP产生的活性离子和酶分子发生了相互作用,使得酶的催化活性中心以及官能团改变,导致酶结构改变,其β-折叠含量先增加后下降。CP或PEF单场耦合酶解均可提高亚麻籽植物乳总酚含量(提升率分别为CP:44.44%、PEF:46.97%),且CP-PEF-EN处理效果更好,总酚含量达0.327 g/100 g(提升率为65.15%),黏度为77.47 mPa·s(降黏39.92%)。本研究表明CP-PEF-EN处理可显著提高亚麻籽植物乳的总酚溶出率并降低其黏度,为新型绿色植物乳加工技术提供了参考。
