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Molecular Dynamical Simulation of Water/Ice Phase Transitions within Carbon Nanotubes under Various Pressures 下载免费PDF全文
A molecular dynamics simulation is performed for water confined within carbon nanotubes with diameters 11.00 A and 12.38A. Under pressures from 0.1 MPa to 500MPa the simulations are carried out by cooling from 300 K to 240K. Water molecules tend to transform from disordered to ordered with different configurations (square, pentagonal, hexagonal and hexagonal plus a chain). It is concluded that denser structures may appear under high pressures. 相似文献
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提出了高效液相色谱法测定联苯菊酯悬浮剂中联苯菊酯含量的方法。样品用甲醇超声提取20min,分取部分提取液用流动相溶液,即甲醇与水(87+13)的混合溶液定容为100mL。用针头过滤器净化并取出此溶液,通过Agilent Eclipse XDB-C_(18)色谱柱,并用上述流动相溶液进行分离,流量为1.4mL·min~(-1),于206 nm波长处用二极管阵列检测器检测。联苯菊酯的质量浓度在3.0~50.0mg·L~(-1)范围内与其峰面积呈线性关系,方法的检出限(3S/N)为0.67mg·L~(-1)。在11.1,15.5,24.4mg·L~(-1)三个添加水平下,回收率在99.2%~104.5%之间,相对标准偏差(n=6)在0.8%~2.9%之间。 相似文献
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Silicon photonics has become one of the major technologies in this very information age. It has been intensively pursued by researchers and entrepreneurs all over the world in recent years. Achieving the large scale silicon photonic integration, particularly monolithic integration, is the final goal so that high density data communication will become much cheaper, more reliable, and less energy consuming. Comparing with the developed countries, China may need to invest more to develop top down nanoscale integration capability (more on processing technology) to sustain the development in silicon photonics and to elevate its own industry structure. 相似文献
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设计、合成了一种光诱导电子转移(Photoinduced Electron Transfer,PET)型香豆素类水溶性Zn~(2+)荧光探针1和2.通过荧光光谱分析实验发现,该探针具有较好的选择性和灵敏度,其荧光强度随着Zn~(2+)的浓度增大而逐渐增强,并可成功实现对人乳腺癌细胞(MCF-7)和枯草杆菌(B.subtilis)的标记.目标探针分子结构均经1H NMR,13C NMR,IR,HRMS及X单晶射线衍射进行了表征,并且还获得了探针2与Zn~(2+)络合物[Zn(2)]的单晶结构,X单晶衍射实验表明络合物[Zn(2)]中Zn~(2+)为五配位,其几何构型为双锥体. 相似文献
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