排序方式: 共有134条查询结果,搜索用时 375 毫秒
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描述了两种不同三维二氧化钛介孔球对水悬浮液中BPA的光降解效果,结果发现紫外线照射下两种三维二氧化钛介孔球的光催化效果要优于P25型二氧化钛,且微球孔隙越小,对BPA的降解效果越好;运用HPLC-MS以及HPLC-MS-MS联用技术对降解中间产物进行定性分析,并且对BPA光催化降解机理进行分析。发现在光催化降解过程中形成5种主要的中间产物并对它们的演变过程进行了讨论。根据分析测定得到的降解中间产物,提出了一个关于两种二氧化钛介孔球光催化剂对BPA降解的详细路径。 相似文献
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Enhanced mobility of MoS2 field-effect transistors by combining defect passivation with dielectric-screening effect
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A facile method of combining the defect engineering with the dielectric-screening effect is proposed to improve the electrical performance of MoS2 transistors. It is found that the carrier mobility of the transistor after the sulfur treatment on the MoS2 channel is greatly enhanced due to the reduction of the sulfur vacancies during vulcanization of MoS2.Furthermore, as compared to those transistors with HfO2 and SiO2 as the gate dielectric, the Al2O3-gate dielectric MoS2 FET shows a better electrical performance after the sulfur treatment, with a lowered subthreshold swing of 179.4 m V/dec,an increased on/off ratio of 2.11 × 106, and an enhanced carrier mobility of 64.74 cm2/V·s(about twice increase relative to the non-treated MoS2 transistor with SiO2 as the gate dielectric). These are mainly attributed to the fact that a suitable k-value gate dielectric can produce a dominant dielectric-screening effect overwhelming the phonon scattering, increasing the carrier mobility, while a larger k-value gate dielectric will enhance the phonon scattering to counteract the dielectricscreening effect, reducing the carrier mobility. 相似文献
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The novel coronavirus pneumonia triggered by COVID-19 is now raging the whole world.As a rapid and reliable killing COVID-19 method in industry,electron beam irradiation can interact with virus molecules and destroy their activity.With the unexpected appearance and quickly spreading of the virus,it is urgently necessary to figure out the mechanism of electron beam irradiation on COVID-19.In this study,we establish a virus structure and molecule model based on the detected gene sequence of Wuhan patient,and calculate irradiated electron interaction with virus atoms via a Monte Carlo simulation that track each elastic and inelastic collision of all electrons.The characteristics of irradiation damage on COVID-19,atoms’ionizations and electron energy losses are calculated and analyzed with regions.We simulate the different situations of incident electron energy for evaluating the influence of incident energy on virus damage.It is found that under the major protecting of an envelope protein layer,the inner RNA suffers the minimal damage.The damage for a^100-nm-diameter virus molecule is not always enhanced by irradiation energy monotonicity,for COVID-19,the irradiation electron energy of the strongest energy loss damage is 2 keV. 相似文献
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以弱阳离子交换聚合物微球(WCX)为模板、N-三甲氧基硅基丙基-N,N,N-三甲基氯化铵(TMSPTMA)为结构导向剂、四乙氧基硅烷(TEOS)为硅胶前驱体,在三乙醇胺弱碱催化作用下,水解缩合形成有机聚合物与二氧化硅复合微球,将此复合微球煅烧后得到大孔二氧化硅微球。探索了不同反应条件对二氧化硅微球的形貌、表面结构和分散性的影响;当TMSPTMA、TEOS与三乙醇胺的体积比为1∶2∶2时可以得到孔径在50~150 nm之间、粒径在2μm左右的硅胶微球。对所制备的大孔硅胶微球表面进行C18(十八烷基二甲基氯硅烷)键合修饰,然后将键合的填料装填到50 mm×4.6 mm的色谱柱中,考察了其对常见的几种标准蛋白质和市售大豆分离蛋白质的分离效果,结果显示这种填料在高效液相色谱蛋白质分离中具有一定的潜力。 相似文献
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采用化学氧化法将Keggin结构K8[CdNi(H2O)W11O39]掺杂到聚苯胺中制得K8[CdNi(H2O)W11O39]/PANI掺杂材料,并用UV,IR,XRD,SEM和EDM等测试方法对掺杂材料进行表征.并研究了所合成掺杂材料催化剂为对亚甲基蓝溶液光降解催化活性.通过控制不同的影响条件,寻找光降解的最适条件,实验结果表明:掺杂材料具有很高的催化活性,最适条件下,110min内对亚甲基蓝溶液的脱色率达到99%以上,因此,[CdNi(H2O)W11O39]/PANI掺杂材料是一种很好的光降解催化剂. 相似文献
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通过接触角测定、金相显微分析、增重法和分子动力学模拟研究了以2-甲基-5-(戊基二硫代)-1,3,4-噻二唑为主要成分的复配型缓蚀剂(TSJ-T6)、2-巯基-5-甲基-1,3,4-噻二唑(MMTD)和2,5-二巯基-1,3,4-噻二唑(DMTD)对银片在单质硫与硫醇共存体系中的缓蚀性能。由接触角和金相显微分析结果可以看出,缓蚀剂分子通过吸附作用在银片与腐蚀介质之间形成了缓蚀膜,对银片的腐蚀起到了良好的抑制作用;增重实验结果表明,三种缓蚀剂在较低浓度时对银片均具有良好的缓蚀效果,其中以TSJ-T6的缓蚀性能最优;且三种缓蚀剂在银片表面的吸附均符合Langmuir吸附等温方程;通过分子动力学模拟研究了缓蚀剂在Ag(111)表面的吸附行为。 相似文献
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本文研究了主要成分为5-甲基-2-戊基二硫代-1,3,4-噻二唑的复配型缓蚀剂TSJ-T6,在浓度为5.0×10-5g/g的H2S中对银的缓蚀性能。通过增重实验、接触角分析、电化学极化曲线测试以及分子动力学模拟研究了该缓蚀剂的缓蚀效率及缓蚀机理。增重实验结果证明,缓蚀剂TSJ-T6对银片在H2S中的腐蚀具有良好的缓蚀效果,缓蚀剂浓度为2.5×10-5g/g时,缓蚀效率高达94.51%。接触角分析结果表明,该缓蚀剂分子在银片和腐蚀液的界面形成了一层疏水保护膜。极化曲线结果表明,缓蚀剂TSJ-T6的存在降低了阴、阳极的塔菲尔斜率,为混合型缓蚀剂;同时,该缓蚀剂的存在显著降低了腐蚀电流密度,表明该缓蚀剂对银片在H2S中的腐蚀有良好的缓蚀效果。分子动力学模拟表明,缓蚀剂分子通过噻二唑环和链上的硫、氮原子吸附在银表面,烷基链则以一定角度指向溶液。 相似文献
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