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1.
用实空间自洽场理论研究了二嵌段共聚物薄膜受限于平行板中的模板化自组装情况.通过改变平行板表面场修饰的情况,给出了粗略微观结构,观察了体系微相结构的变化过程,并对所观察到的变化规律作了讨论.另一方面,固定平行板的厚度、相分离强度等参数,改变吸附表面场的大小,观察并讨论了体系微相结构的变化及其规律.结果表明,二嵌段共聚物体系的微相结构是由受限条件和表面场修饰共同所决定的,因而控制表面场修饰情况的相关参数可以得到所期望的特定高分子体系结构.  相似文献   
2.
用实空间自洽场理论研究了单个纳米颗粒对受限于矩形边界的二嵌段共聚物层状结构的影响.选取了处于强分凝区域的层状结构二嵌段共聚物作为研究对象.通过调节纳米颗粒的半径、颗粒表面场强度等体系参数,观察到了柱状结构出现在多层的层状结构中间,即柱状和层状的共混结构.结果表明,二嵌段共聚物的柱状和层状共混等结构是由矩形边界和纳米颗粒表面参数相互竞争所决定的,因而控制矩形边界条件和纳米颗粒的相关参数可以得到所期望的特定微相结构,为纳米微结构的设计提供了一条可能的途径.  相似文献   
3.
王向红  李士本  章林溪  梁好均 《中国物理 B》2011,20(8):83601-083601
The surface-induced effect on the morphologies of lamella-forming diblock copolymers in nanorod arrays is studied by using the self-consistent field theory.In the simulation study,a rich variety of novel morphologies are observed by variations in the strength of the surface field for the diblock copolymers.Different surface-field-induced effects are examined for the diblock copolymers in the arrays with distinct preferential surfaces.It is observed that the majority-block preferential surfaces have more obvious induced effects than those of minority-block preferential surfaces.The strong surface fields exhibit different behaviours from those observed in the weak surface fields,by which the morphologies possess cylindrical symmetries.Results from this research deepen the knowledge of surface-induced effects in a confinement system,which may aid the fabrication of polymer-based nanomaterials.  相似文献   
4.
在不同条件、不同形状与尺寸孔隙下,星型ABC三嵌段共聚物自组装形成的核-壳-柱状相的相行为,纳米结构形成与小孔几何形状有关,不同表面势能对星型ABC三嵌段共聚物的自组装过程有影响.  相似文献   
5.
The phase behaviours of diblock copolymers under cylindrical confinement are studied in two-dimensional space by using the self-consistent field theory. Several phase parameters are adjusted to investigate the cylindrical-confinement-induced phase behaviours of diblock copolymers. A series of lamella-cylinder mixture phases, such as the mixture of broken-lamellae and cylinders and the mixture of square-lamellae and cylinders, are observed by varying the phase parameters, in which the behaviours of these mixture phases are discussed in the corresponding phase diagrams. Fur-thermore, the free energies of these mixture phases are investigated to illustrate their evolution processes. Our results are compared with the available observations from the experiments and simulations respectively, and they are in good agreement and provide an insight into the phase behaviours under cylindrical confinement.  相似文献   
6.
Channel interaction of Ba 6pns (J=1) autoionizing series   总被引:2,自引:0,他引:2       下载免费PDF全文
李士本  戴长建  张艳 《中国物理》2002,11(7):690-693
The channel interactions between the Ba 6pnl (J=1) autoionizing series with different l and n have been observed by means of unsaturation and saturation excitation methods.The observed interactions were interpreted with the spectral density calculated from the multichannel quantum defect theory,the results of which are quite satisfactory.  相似文献   
7.
采用一个13通道多通道量子亏损(MQDT)模型对Ba原子6pns(J=1)自电离态的光谱进行了计算,并获得了它们的理论计算光谱。通过分析它们的自电离态光谱的特性,对6pns(J=1)自电离系列之间的组态相互作用现象进行了解释。  相似文献   
8.
表面场诱导线性三嵌段共聚物薄膜的微结构及其转变规律   总被引:1,自引:0,他引:1  
采用实空间自洽场理论研究了ABC对称线性三嵌段共聚物薄膜的自组装结构及其转变规律.选取具有特定聚合物参数的对称线性三嵌段共聚物,对无修饰条纹和有修饰条纹的两类薄膜受限表面情况,通过调节其薄膜表面场强度和薄膜厚度,获得了一系列新颖的聚合物薄膜微结构.研究结果表明,在无修饰条纹的单一薄膜受限情况下,共聚物趋向于形成规整有序的层状或穿孔层状结构;而在有条纹修饰情况下,共聚物在相应的条纹修饰区域下发生微相分离并趋于形成水平柱状结构.  相似文献   
9.
STARK STRUCTURE OF THE RYDBERG STATES OF ALKALINE-EARTH ATOMS   总被引:1,自引:0,他引:1       下载免费PDF全文
郅妙婵  戴长建  李士本 《中国物理》2001,10(10):929-934
The Stark effects of the Rydberg states in the alkaline-earth atoms are studied theoretically. Using a method similar to the treatment of alkali atoms, the properties of the Stark states of Mg, Ca, Sr and Ba atoms in the regions far away from the perturbers are investigated. The Stark maps for Mg (n=16, M=0), Ca (n=10, M=0), Sr (n=12, M=0) and Ba (n=13, |M|=0,1) are presented. Topics such as the general methods of calculation, the treatment of fine structure, and the structure of level anti-crossings are discussed. The comparison between the theoretical and experimental Stark maps is satisfactory.  相似文献   
10.
李士本  戴长建 《中国物理》2007,16(2):382-391
Using a three-step laser saturation excitation technique, the saturation effects on the Ba 6pns (J = 1) and 6pad (J = 1, 3) autoionization spectra are observed systemically in zero field. These saturation spectra are introduced to determine the high n members of 6pnl (l = 0, 2) autoionizing series and are used to analyse the channel interactions among the autoionizing series in zero field. Furthermore, the saturation excitation technique is applied to the electric field case, in which the saturation spectra of Ba 6pnk (|M|= 0, 1) autoionizing Stark states are measured. Most of these saturation spectra are observed for the first time so far as we know, which indicate the mixing of the autoionizing states in the electric fields.  相似文献   
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