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以两个形状杂化分子(Shape Hybrid Molecules)为目标分子,研究了它们在气液界面上形成Langmuir膜的过程和Langmuir-Blodgett(LB)膜的聚集态结构,杂化分子是由Wells-Dawson型磷钨氧簇(Polyoxometalates,POMs)和T_8型的倍半硅氧烷簇(Polyhedral Oligosilsesquioxane,POSS),通过对苯二甲酸有机连接链(OL)用共价键构筑的具有杂化性质和哑铃形状的簇-簇杂化分子[POM-OL-POSS).这两种杂化分子的差别在于POSS段中,外围有机基团的尺寸不同,在实验中,采用Langmuir和LB膜技术,了解POSS外围的七个取代基变化导致的分子尺寸变化对Langmuir膜形成过程和LB膜结构的影响,采用Langmuir技术测定了表面压-平均分子面积(π-A)等温曲线和π-A循环等温曲线,跟踪并研究了这两个杂化分子在水表面上形成Langmuir膜的过程,实验结果表明,两个杂化分子都表现出良好的两亲性,从气相变化到固相的过程中,杂化分子经历了从分散到集中的过程,将这些膜转移到基片上,得到单层的LB膜,再利用原子力显微镜(AFM)和透射电子显微镜(TEM)研究了LB膜的表面形貌和聚集态结构.由于POM段中含有钨和钒金属,可以直接用TEM观察聚集态结构,发现了在气-液和液-固相转变过程中,LB膜中杂化分子的聚集态结构都呈现涨落特征,一种凝聚态物理中由相转变导致结构涨落的重要物理现象,本研究获得的结果能够帮助我们以及这个领域的研究者们继续优化杂化分子的结构,进一步构筑具有有序结构的膜和本体材料。
Two kinds of hybrid molecules (Shape Hybrid Molecules) were used as target molecules to study the formation of Langmuir membrane at the gas-liquid interface and the aggregated structure of Langmuir-Blodgett (LB) membrane. The hybrid molecules were composed of Wells-Dawson Polyoxometalates (POMs) and T_8 type polyhedral Oligosilsesquioxanes (POSS), which are characterized by the covalent bonding of the organic linkages (OL) of terephthalic acid Shaped cluster-cluster hybrids [POM-OL-POSS]. The difference between the two hybrids is that the sizes of the peripheral organic groups in the POSS segment are different. In the experiment, Langmuir and LB membrane techniques were used to understand the POSS The influence of molecular size change on the Langmuir film formation and LB film structure caused by the change of seven substituents on the periphery was investigated. Langmuir technique was used to determine isotherm curve of π-A and isothermal curve of π-A cycle. The formation of Langmuir films on the water surface was investigated and investigated. The experimental results show that both of the two hybrids exhibit good amphiphilicity. From gas phase to solid phase, the hybridization The molecules have gone from scattered to , These films were transferred onto the substrate to obtain a single layer of LB film, and the surface morphology and aggregation state of the LB film were studied by atomic force microscopy (AFM) and transmission electron microscopy (TEM) Containing tungsten and vanadium metal, TEM can be directly observed aggregation state structure, found in the gas-liquid and liquid-solid phase transition, the LB film in the aggregation state of the hybrid molecules showed fluctuations in the characteristics of a condensed state The results of this study can help us and researchers in this field to continue to optimize the structure of hybrid molecules and further construct the ordered structure of the membrane and bulk materials.