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micro-and submicrostructural evidence for high-temperature brittle-ductile transition deformation of hornblende: Case study of high-grade mylonites from Diancangshan, western Yunnan

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Science China Earth Sciences 2007年第10期50卷 1459-1470页

作者： CAO ShuYun, LIU JunLai? & HU Ling State Key Laboratory of Geological Processes and Mineral Resources (GPMR), China University of Geosciences, Beijing 100083, China Key Laboratory of Lithosphere Tectonics and Lithoprobing Technology of Ministry of Education, China University of Geo- sciences, Beijing 100083, China State Key Laboratory of Geological Processes and Mineral Resources (GPMR) China University of Geosciences Beijing 100083 China Key Laboratory of Lithosphere Tectonics and Lithoprobing Technology of Ministry of Education China University of Geosciences Beijing 100083 China

OM (optical microscope)/TEM (transmission electron microscope) micro- and submicrostructural analysis of hornblende rocks sheared at high temperatures from the Diancangshan area, western Yunnan reveals evidence for deformation in the brittle-ductile transition of hornblende at middle crustal level (about 637℃ and 0.653 GPa) and mechanisms of deformation in the transitional regime are further discussed. Sheared hornblende rocks at middle crustal level have typical mylonitic microstructures, shown by coarse porphyroclasts and fine matrix grains. Different mineral phases in the rocks show distinct deformation characteristics. Hornblende and feldspar grains are intensely deformed with ob- vious grainsize reduction, but quartz grains are recrystallized dominantly by grain growth. Hornblende grains show typical brittle-ductile transition nature. Initial crystallographic orientations of porphyro- clasts have strong effects on the behavior of grains during deformation. There are mainly two types of porphyroclasts, type I "hard" porphyroclasts and type II "soft" porphyroclasts, with [001] perpendicular and parallel to external shear stresses respectively. "Hard" porphyroclasts generally occur as compe- tent grains that are rarely deformed or sometimes deformed by fracturing and dislocation tangling. "Soft" porphyroclasts are highly deformed primarily by dislocation tangling (as shown in the cores of the porphyroclasts), but twinning, dislocation glide and climb probably due to hydrolytic weakening also contribute to dynamic recrystallization of the porphyroclasts into fine grains in the matrix. The micro- and submicrostructures of the two types of porphyroclasts and fine-grained matrix provide powerful evidence for the behavior of brittle-ductile transition of hornblende grains. It is concluded that twinning nucleation is one of the most important processes that operate during dynamic recrystalliza- tion of hornblende crystals at the brittle-ductile transition. (100) [001] t

关键词： hornblende, brittle-ductile transition, micro-and submicrostructures, twinning nucleation recrystallization, Diancangshan

Mechanical Properties of micro-regions in Cement-based Material based on the PeakForce QNM Mode of AFM

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Journal of Wuhan University of Technology(Materials Science) 2019年第4期34卷 893-899页

作者： REN Mei SHI Tao College of Management Zhejiang University of Technology Hangzhou 310023China College of Civil Engineering and Architecture Zhejiang University of TechnologyHangzhou 310023China Key Laboratory of Civil Engineering Structures & Disaster Prevention and Mitigation Technology of Zhejiang Province Hangzhou 310023China Department of Civil and Environmental Engineering Northwestern UniversityEvanstonIL 60208USA

In this paper, the cement paste and the mortar were tested using the PF-QNM technique. It is shown that the PF-QNM technique is very powerful to characterize the mechanical properties of micro-and nanostructures in the cement-based materials. It does not have strict requirements for test environment and it does not damage the surface of the material. High-resolution images can be obtained very easily, and they can be analyzed statistically. The test results show that PF-QNM analysis can test not only the mechanical properties of the cement paste, but also investigate the interfacial regions in the cement-based material, including the variation in the mechanical properties of interface regions and the extension of the interfacial regions. During the test, care must be taken to choose the size of test area;indeed, a test area too small is not representative but too large leads to lack of stability. The recommended side is a square with a length of in the range 10-30 μm.

关键词： PF-QNM peakforce tapping AFM cement pastes mortar Young's modulus interface micro-and nano-structure nanoindentation

Soft Fibrous Structures in Nature as Liquid Catcher

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Acta Mechanica Solida Sinica 2019年第5期32卷 580-590页

作者： Moxiao Li Tianjian Lu Feng Xu State Key Laboratory for Strength and Vibration of Mechanical Structures School of AerospaceXi'an Jiaotong UniversityXi'an 710049China Bioinspired Engineering and Biomechanics Center(BEBC) Xi'an Jiaotong UniversityXi'an 710049China State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China Nanjing Center for Multifunctional Lightweight Materials and Structures(MLMS) Nanjing University of Aeronautics and AstronauticsNanjing 210016China The Key Laboratory of Biomedical Information Engineering of the Ministry of Education School of Life Science and TechnologyXi'an Jiaotong UniversityXi'an 710049China

Past decades have witnessed the explosive growth of interest in the field of bioinspired materials,of which the structures and properties can be well utilized for industrial and bioengineering *** these structures,the natural fibrous structures propose diverse strategies to adapt to their environment,offering inspirations for versatile applications,especially droplet *** various well-adapted soft structures and materials,these fibrous structures show good control over their interaction with liquids(e.g.,water),providing a database full of effective solutions to these droplet-related scientific and technical problems(e.g.,colloidal synthesis,single-cell gene sequencing,drug delivery and solution synthesis).In this review,the current achievements in water collection by multiple fibrous structures are highlighted;the structures,basic models,bio-inspired structures and their applications are presented;and the current challenges and future prospects for the development of bio-inspired fibrous structures are discussed.

关键词： Soft fibrous structure micro-and nanostructure Bio-inspired materials Surface tension

高分子薄膜中异质含氟表面的宏观、微观和纳米结构及应用（英文）

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出版与印刷 2015年第3期 32-46页

作者： V.G.Nazarov Moscow State University of Printing Arts

INTRODUCTION Recently,in polymer technology,there has been an evident change in the production of flexible functional film materials and devices on flexible polymer *** aforementioned products are used in power engineering(light-emitting materials,solar cells),medicine(materials with incorporated drugs and other special ingredients,functionalized membranes,medical transdermal films),

关键词： micro-and Nanostructures Polymer Films Application