Needle-like crystals consisting of a solid solution of C(60)-C(70)fullerene were synthesized by a liquid-liquid interfacial precipitation method using toluene and 2-propanol as solvents.A machined crystal with a V-not...Needle-like crystals consisting of a solid solution of C(60)-C(70)fullerene were synthesized by a liquid-liquid interfacial precipitation method using toluene and 2-propanol as solvents.A machined crystal with a V-notch was placed in a focused ion beam scanning electron microscope where it was bent until fracture by pushing it with a molybdenum probe to measure its mechanical properties and its fracture surface was examined.The crystals had a tensile strength of 58-71 MPa,which is much higher than C60 fullerene needle-like crystals and slightly larger than alumina,and a fracture toughness of 1.1-1.3 MPa m(1/2).Moreover,it is possible to change the plasticity and fracture toughness of the C(60)-C(70)crystals by solvation of different numbers of fullerene molecules.The C(60)-C(70)fullerene crystals have the potential for use as electrodes,anchors for brittle materials,and ductile wires to carry electricity.展开更多
Based on mineral component and in-situ vane shear strength of deep-sea sediment, four kinds of simulative soils were prepared by mixing different bentonites with water in order to find the best simulative soil for the...Based on mineral component and in-situ vane shear strength of deep-sea sediment, four kinds of simulative soils were prepared by mixing different bentonites with water in order to find the best simulative soil for the deep-sea sediment collected from the Pacific C-C area. Shear creep characteristics of the simulative soil were studied by shear creep test and shear creep parameters were determined by Burgers creep model. Research results show that the shear creep curves of the simulative soil can be divided into transient creep, unstable creep and stable creep, where the unstable creep stage is very short due to its high water content. The shear creep parameters increase with compressive stress and change slightly or fluctuate to approach a constant value with shear stress, and thus average creep parameters under the same compressive stress are used as the creep parameters of the simulative soil. Traction of the deep-sea mining machine walking at a constant velocity can be calculated by the shear creep constitutive equation of the deep-sea simulative soil, which provides a theoretical basis for safe operation and optimal design of the deep-sea mining machine.展开更多
基金partly supported by the Center of Materials Research for Low Carbon Emission of National Institute for Materials Sciencethe Japan Society for the Promotion of Science KAKENHI(No.26600007)
文摘Needle-like crystals consisting of a solid solution of C(60)-C(70)fullerene were synthesized by a liquid-liquid interfacial precipitation method using toluene and 2-propanol as solvents.A machined crystal with a V-notch was placed in a focused ion beam scanning electron microscope where it was bent until fracture by pushing it with a molybdenum probe to measure its mechanical properties and its fracture surface was examined.The crystals had a tensile strength of 58-71 MPa,which is much higher than C60 fullerene needle-like crystals and slightly larger than alumina,and a fracture toughness of 1.1-1.3 MPa m(1/2).Moreover,it is possible to change the plasticity and fracture toughness of the C(60)-C(70)crystals by solvation of different numbers of fullerene molecules.The C(60)-C(70)fullerene crystals have the potential for use as electrodes,anchors for brittle materials,and ductile wires to carry electricity.
基金Project(51274251)supported by the National Natural Science Foundation of China
文摘Based on mineral component and in-situ vane shear strength of deep-sea sediment, four kinds of simulative soils were prepared by mixing different bentonites with water in order to find the best simulative soil for the deep-sea sediment collected from the Pacific C-C area. Shear creep characteristics of the simulative soil were studied by shear creep test and shear creep parameters were determined by Burgers creep model. Research results show that the shear creep curves of the simulative soil can be divided into transient creep, unstable creep and stable creep, where the unstable creep stage is very short due to its high water content. The shear creep parameters increase with compressive stress and change slightly or fluctuate to approach a constant value with shear stress, and thus average creep parameters under the same compressive stress are used as the creep parameters of the simulative soil. Traction of the deep-sea mining machine walking at a constant velocity can be calculated by the shear creep constitutive equation of the deep-sea simulative soil, which provides a theoretical basis for safe operation and optimal design of the deep-sea mining machine.
