共查询到19条相似文献,搜索用时 125 毫秒
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用于ICF实验的掺溴聚苯乙烯平面调制箔靶 总被引:1,自引:0,他引:1
以掺溴聚苯乙烯平面调制箔靶的制备为主,介绍通过激光干涉法结合图形转移工艺获得具有正弦起伏图形的掺溴聚苯乙烯平面调制箔靶的工艺.对表面调制起伏图形的精确转移进行研究,以SEM和台阶仪监控图形转移过程,控制耦合在调制图形上的表面粗糙度. 相似文献
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化学修饰的Sol-Gel法因无需光刻胶、腐蚀液被用于YBCO薄膜图形的制备。以丙烯酸(AA)、苯酰丙酮(BzAcH)作为化学修饰剂制备YBCO薄膜图形,研究了化学修饰剂、光源、前烘温度和时间、溶洗剂对薄膜图形的最小线宽和质量的影响。 相似文献
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纳米压印模板通常需要经过电子束光刻、电子束沉积、光刻胶剥离、反应离子刻蚀等一系列复杂工艺获得,这使得纳米压印模板的制作难度大,成本高. 寻找一种灵活简单的纳米压印模板制备方法以提升纳米压印模板的制作效率,是广泛应用纳米压印技术的研究重点和难点. 本文以写好光栅结构的电子束光刻胶层为母模板,获得聚二甲基硅氧烷软模板,并以此为模板对共轭高分子聚(9,9-二辛基)芴薄膜进行纳米压印,实现光栅结构转移,成功制备出纳米光栅结构的共轭高分子薄膜. 偏振吸收谱和透射电镜结果表明,纳米压印实现图案转移的同时,还可以将共轭高分子的主链控制在光栅条纹方向,这对有机发光器件性能的提升具有重要的意义. 研究结果还表明,应用该方法同样可以对聚(9,9-二辛基芴共苯并噻二唑)薄膜进行光栅图案化,同时实现其取向控制.
关键词:
纳米压印
软模板共轭高分子
分子链取向 相似文献
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为了研究惯性约束聚变(ICF)实验用靶丸不同密度界面的流体力学不稳定性增长,设计并制备了聚苯乙烯(CH)/碳气凝胶(CRF),CRF/硅气凝胶(SiO2)和CH/Al三种双介质调制靶。采用溶胶-凝胶工艺制备了密度分别为250和800mg/cm3的CRF气凝胶薄片;采用激光微加工工艺分别在两种不同密度的CRF薄片和工业用纯Al箔上引入调制图形;采用旋涂工艺在Al箔和CRF薄片(250mg/cm3)的调制表面制备一层CH薄膜,得到CH/Al和CH/CRF双介质调制靶,采用溶胶-凝胶工艺在CRF薄片(800mg/cm3)表面制备一层低密度SiO2气凝胶,得到CRF/SiO2双介质调制靶。采用电子天平、扫描电子显微镜、工具显微镜和台阶仪对所制备的CH/CRF,CRF/SiO2和CH/Al三种双介质调制靶进行靶参数测量。结果表明:三种双介质调制靶层与层之间结合紧密,界面清晰,调制图形为正弦,靶参数测量准确。 相似文献
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瑞利-泰勒不稳定性增长的准确估计是激光聚变的重要研究课题。在神光Ⅱ装置上,利用面向背光照相技术对正弦调制平面靶的瑞利-泰勒不稳定性增长进行了实验研究,得到了清晰的时空分辨图像;采用傅里叶变换取基模法和求波峰波谷差值法分析了实验结果;两种方法得到的靶扰动增长因子相同。实验中平面靶扰动增长较小可能是密度梯度致稳和烧蚀致稳抑制了扰动增长,也可能是扰动进入了非线性阶段而使增长不大。 相似文献
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侧向背光照相能直接反映靶表面扰动幅度的变化情况。在神光Ⅱ装置上,实验利用侧向背光照相技术,对烧蚀面扰动引起的内界面扰动增长进行了观测。实验结果表明,观察到的内界面扰动幅度大于期望值。分析认为,造成内界面较大扰动增长的原因主要是2维效应。X光辐照的主要是烧蚀面的中间部分,烧蚀面扰动引起的内界面的扰动就呈现出一幅从中间的扰动区域逐渐过渡到四周的图像。由此,提出了新的靶优化设计方案,应尽可能减小沿背光方向的样品尺寸。 相似文献
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V. V. Sitnik 《Russian Journal of Physical Chemistry B, Focus on Physics》2009,3(3):373-382
The interaction of shock waves with woodland massifs with consideration given to vegetation destruction is examined. The results of numerical simulations of the propagation of a perturbation through a vegetation massif based on solving the Euler equations for two-dimensional and axisymmetric cases are presented. This approach was used by the present author in simulating the propagation of wave fronts through woodland massifs without regard for forest stand destruction. The effect of vegetation is reproduced by introducing bulk forces in the volume occupied by forest. An initial perturbation of explosion-in-flight type was specified in the form of an increased-pressure region located at various heights from the ground surface. Simple threshold models are used to examine the effect of the dynamic pressure on vegetation destruction. A refined model was developed to investigate the change in the configuration of woodland massifs with consideration given to vegetation fall and the effect of this process on the rate of perturbation dissipation. The system of equations was solved by the Godunov method implemented using parallel programming. Numerical experiments were conducted with the use of two types of models of forest stand destruction, with various threshold values of the destruction factor, various initial perturbation intensities, and various heights above the vegetation massif. The effects arising during the interaction of a high-intensity perturbation with a woodland massif were identified. An analysis of the results showed that the destruction of vegetation occurs during its interaction with the fronts of the incident and reflected shock wave and with the jet core of the perturbation. In some cases, the model taking into account the accumulation of fallen vegetation predicts situations where destruction will occur only in the upper part of the forest stand, without touching the canopy. This effect can explain the existence of such regions in the area of the Tunguska event. It was also demonstrated that estimates of the sizes of the destruction zones obtained with the use of the models taking into account the influence of vegetation on the perturbation and destructibility differ substantially from those obtained within the framework of the models without regard for vegetation resistance. The highest range of perturbation dissipation was predicted by the models simulating the formation of obstructions. 相似文献
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T. V. Kononenko I. A. Nagovitsyn G. K. Chudinova 《Bulletin of the Lebedev Physics Institute》2009,36(2):29-33
The technique of forming mesotetraphenylporphyrin microstructures on the quartz substrate surface by laser-induced forward transfer from a target was developed. The target was a transparent substrate with a thin titanium coating onto which five mesotetraphenylporphyrin layers were deposited by the Langmuir-Schaefer method. The target was irradiated with single 500-ps pulses through a transparent substrate, which causes nondestructive thermal deformation of a metal film, resulting in efficient porphyrin emission from the target. The effect of the titanium film thickness and the laser emission wavelength on the transfer process was studied. An analysis of the optical absorption and fluorescence spectra of obtained surface microstructures suggests that the material structure is retained during laser transfer. 相似文献
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基于光滑粒子流体动力学方法, 分别采用实测样品几何缺陷模型和简化V形沟槽模型对铅的微喷射过程进行了模拟. 重点分析了金属表面几何缺陷微细结构对微喷射特性的影响, 并将数值计算结果与相应的实验测量值进行对比. 结果表明, 基于实测样品几何缺陷模型计算的最快喷射速度和累积喷射量与实验测量结果符合得很好. 进一步研究发现, 在实测样品几何缺陷诱导的微喷射过程中存在“二次汇聚喷射”现象, 与单次喷射相比, 该过程会诱导产生更高的喷射速度并显著影响微喷物的空间密度分布. 这说明除了受扰动波长、深度影响外,表面几何缺陷微细结构也是影响金属微喷射过程的重要因素. 相似文献
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在基于红外高光谱辐射数据进行大气遥感方面的研究中,准确模拟红外高光谱数据是很重要的一步。分析了红外高光谱辐射仪的测量原理,建立了基于Atmospheric Radiation Transfer Simulator(ARTS)的考虑仪器干涉图截断与离散化处理过程的正向模型。在该正向模型中,首先采用高光谱辐射传输模式ARTS模拟得到离散化理想光谱,通过逆傅里叶变换将理想光谱转化为干涉图,对干涉图加窗截断处理,模拟仪器响应函数对干涉图的影响,最后采用傅里叶变换得到仪器测量光谱。在这一过程中,窗口函数的选择取决于仪器的干涉图截断方式。未经过切趾处理的仪器,其对应的窗口函数为矩形窗口;经过切趾函数处理,可以减少干涉图截断造成的能量泄露现象。逆傅里叶变换与傅里叶变换过程中必须满足Nyquist采样定律。基于已建立的正向模型,模拟了Atmospheric Emitted Radiance Interferometer (AERI)在Southern Great Plains (SGP)站点的108组晴空辐射数据,并与AERI的实测结果进行比较分析,结果发现理想光谱与AERI实测光谱在吸收线上差异较大,最大残差达到35 mW·sr-1·m-2·(cm-1)-1(简称RU)以上,增加干涉图截断过程后,模拟光谱与实测光谱的最大残差减小到10 RU以内。截断过程的增加对模拟光谱的精度有明显提高,尤其在吸收线上,模拟光谱明显被平滑,模拟精度显著提高。进一步分析六种常用窗口函数截断处理的结果与AERI实测数据的残差,结果发现,模拟过程中选择窗口函数为矩形窗口时,模拟光谱与AERI实测数据残差最小,基本可以约束在5 RU以内,确定了AERI的干涉图截断方式可以近似看作矩形截断。另外,在理想光谱转换为干涉图的过程中,理想光谱分辨率的选择决定了干涉图信息的采样率以及ARTS的计算效率,因此综合考虑模型计算精度和模型计算效率,确定最佳的理想光谱分辨率对于提高模型计算效能是非常必要的;基于此,本文模拟了不同理想光谱分辨率下的仪器测量光谱,对比分析了模拟光谱与AERI实测光谱的残差分布,并讨论了光谱分辨率对模型计算耗时的影响。结果表明,对于AERI,在对应的正向模型中设置理想光谱分辨率为0.241 1 cm-1时,可在保证模型准确度的前提下,最大化模型计算效率。 相似文献
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Combination of phase-modulation interferometry and scanning of the object is capable of restoring the sine of the phase everywhere in the object field. So, information on the direction of the surface relief is obtained. The influences of the analysing surface characteristics and of the process of scanning are studied. 相似文献