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cylindrical-confinement-induced phase behaviours of diblock copolymer melts

Chinese Physics B 2010年第2期19卷 489-497页

作者：刘美娇李士本章林溪王向红 Department of Physics Wenzhou University

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. Furthermore, 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.

关键词： cylindrical confinement phase behaviour diblock copolymer self-consistent field theory

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Dual Effects of Interfacial Interaction and Geometric Constraints on Structural Formation of Poly(butylene terephthalate)Nanorods

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Chinese Journal of Polymer Science 2022年第6期40卷 700-708页

作者： Kaichao Wang Ziwei Lai Jiaman Huang Haiying Li Ziying Liang Junhao Liang Xing Ouyang Xiaoguang Li Yan Cao Institute for Advanced Study(IAS) Shenzhen UniversityShenzhen 518060China College of Materials Science and Engineering Shenzhen UniversityShenzhen 518060China South China Advanced Institute for Soft Matter Science and Technology School of Molecular Science and EngineeringSouth China University of TechnologyGuangzhou 510640China

When the size of the material is smaller than the size of the molecular chain,new nanostructures can be formed by crystallizing polymers in nanoporous ***,the effect of pore wall and geometric constraints on polymer nanostructures remains *** this study,we demonstrate three new restricted nanostructures{upright-,flat-and tilting-ring}in polybutylene terephthalate(PBT)nanorods prepared from nanoporous *** dual effects of geometrical constraints and interfacial interactions on the formation of PBT nanostructures were investigated for the first time by using X-ray diffraction and Cerius^(2) modeling *** weak constraints,the interaction between pore wall and the PBT rings is dominant and the ring plane tends to be parallel to the pore wall and radiate outward to grow the upright-ring ***,in strong 2D confinement,a structural formation reversal occurs and geometrical constraints overpower the effect of pore *** tend to pile up vertically or obliquely along the long axis of the rod,so the flat-and tilting-ring crystals are predominate in the constrained *** principle,our study of the nanostructure formation based on the geometrical constraints and the pore wall interfacial effects could provide a new route to manipulate the chain assembly at the nanoscale,further improving the performance of polymer nanomaterial.

关键词： cylindrical confinement Poly(butylene terephthalate) Nanorods Geometry constraints Interfacial interaction

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Recent technological progress in Asia from the FirstAsian Symposium on Laser-induced Breakdown Spectroscopy

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Frontiers of physics 2016年第6期11卷 209-215页

作者： Lian-Bo Guo Xiang-You Li Wei Xiong Xiao-Yan Zeng Yong-Feng Lu Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology (HUST) 1037 Luoyu Road Wuhan ~3007~ China Department of Electrical Engineering University of Nebraska-Lincoln Lincoln NE 68588-0511 USA

As an atomic emission spectroscopy technique, laser-induced breakdown spectroscopy (LIBS), first proposed by Breech and Cross in 1962 [1], has attracted much academic and industrial interest for its unique properties. By focusing a pulsed laser onto the surface of a target, laser-induced plasmas can be generated. The simplicity of sample preparation of the laser ablation process enables LIBS to directly analyze solid, liquid, or gaseous materials in the atmosphere, making it a convenient tool for chemical analyses. The unique features of LIBS such as requiring little or no sample preparation, allowing remote detection, and facilitating multiple elemental analyses have contributed to its rapid development in recent years.

关键词： PARTIAL LEAST-SQUARES CONFINED FUSION DEVICE QUANTITATIVE-ANALYSIS INDUCED PLASMA CARBON CONTENT OPTICAL-EMISSION SPECTRUM STANDARDIZATION cylindrical confinement DOMINANT FACTOR LIQUID SAMPLES

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