ZrO2, CuO, Al2O3 and SiO2 mixed nanopowder was used to coat the head of sapphire single crystal fiber for improving the properties of high-temperature single crystal fiber sensor. The result indicates that the head co...ZrO2, CuO, Al2O3 and SiO2 mixed nanopowder was used to coat the head of sapphire single crystal fiber for improving the properties of high-temperature single crystal fiber sensor. The result indicates that the head coated with above mixed nanopowder shows better optical stability, shorter response time and higher thermal shock resistance, in comparison with the head coated with coarse-grained particles with the same chemical compositions.展开更多
Initial process is influenced by substrate microstructure according to the study of initial stage of electroless plating on low carbon steel and pure iron. For low carbon steels, depositing on cementite is prior to th...Initial process is influenced by substrate microstructure according to the study of initial stage of electroless plating on low carbon steel and pure iron. For low carbon steels, depositing on cementite is prior to that on ferrite; and for pure iron, the grain boundaries and some favourable grains are deposited more easily. The initial reactions of electroless depositing of Ni-P alloy have been tentatively proposed.展开更多
The effects of heat treatment on the phase transformation temperature and the microstructure of Ni-Ti-Nb alloy have been investigated by means of R-T method, TEM and EPMA. With the increase of annealing temperature, c...The effects of heat treatment on the phase transformation temperature and the microstructure of Ni-Ti-Nb alloy have been investigated by means of R-T method, TEM and EPMA. With the increase of annealing temperature, cooling rate and ageing temperature, the M-s temperature increases. TEM observations show no new precipitated phase was found in the B2 parent phase after heat treatment, but EPMA shows the content of Ni (or Ni/Ti ratio) in the B2 matrix changed. The main reason for the change of transformation temperature lies in the change of the matrix composition (or Ni/Ti ratio) with the variation of heat treatment procedure.展开更多
The innovative approach imparting strength and toughness to carbon fiber reinforced polymer composites (CFRP) is put forward from the viewpoint of biomimetics. Helical fibers produced by twisting fiber bundle are arra...The innovative approach imparting strength and toughness to carbon fiber reinforced polymer composites (CFRP) is put forward from the viewpoint of biomimetics. Helical fibers produced by twisting fiber bundle are arranged in the matrix to simulate the unique structure of natural fibers. The results on the CFRP with helical fiber bundles show that, under the same state of strong fiber/matrix interface, the impact fracture toughness can be improved substantially compared to conventional composites with plain fibers. The beneficial effect is attributed to the helical fiber bundles which act as single fibers of huge diameter effectively increasing the fiber elastic energy.展开更多
Diamond films have been synthesized by means of LCVD through combined effects of a XeCl ultraviolet laser and an infrared CO2 laser. A special apparatus has been developed. The conditions of synthesis and the roles pl...Diamond films have been synthesized by means of LCVD through combined effects of a XeCl ultraviolet laser and an infrared CO2 laser. A special apparatus has been developed. The conditions of synthesis and the roles played by both lasers were studied. High-purity diamond films were deposited on Si substrates at 340 degrees C.展开更多
THE self-assembled monolayers (SAMs) emerged in the last decade as one of the most convenient and useful methods of preparing molecularly tailored interfaces with controlled spatial and geometric constraints, and have...THE self-assembled monolayers (SAMs) emerged in the last decade as one of the most convenient and useful methods of preparing molecularly tailored interfaces with controlled spatial and geometric constraints, and have been examined widely from both fundamental and applied perspectives. Recently, SAMs of both unfunctionalized and redox-attached alkanethiols展开更多
THE electrochemical and/or photochemical active organic molecules have attracted much atten-.tion due to their potential applications in the field of molecular electronics. The azobenzenederivatives have been widely s...THE electrochemical and/or photochemical active organic molecules have attracted much atten-.tion due to their potential applications in the field of molecular electronics. The azobenzenederivatives have been widely studied as typical systems, owing to their reversible trans-cis iso-merization and reduction/oxidation reactions (see fig. 1 (a) ). We have studied the char-acteristic photochromic and electrochemical behavior of azobenzene Langmuir-Blodgett mono-展开更多
文摘ZrO2, CuO, Al2O3 and SiO2 mixed nanopowder was used to coat the head of sapphire single crystal fiber for improving the properties of high-temperature single crystal fiber sensor. The result indicates that the head coated with above mixed nanopowder shows better optical stability, shorter response time and higher thermal shock resistance, in comparison with the head coated with coarse-grained particles with the same chemical compositions.
文摘Initial process is influenced by substrate microstructure according to the study of initial stage of electroless plating on low carbon steel and pure iron. For low carbon steels, depositing on cementite is prior to that on ferrite; and for pure iron, the grain boundaries and some favourable grains are deposited more easily. The initial reactions of electroless depositing of Ni-P alloy have been tentatively proposed.
文摘The effects of heat treatment on the phase transformation temperature and the microstructure of Ni-Ti-Nb alloy have been investigated by means of R-T method, TEM and EPMA. With the increase of annealing temperature, cooling rate and ageing temperature, the M-s temperature increases. TEM observations show no new precipitated phase was found in the B2 parent phase after heat treatment, but EPMA shows the content of Ni (or Ni/Ti ratio) in the B2 matrix changed. The main reason for the change of transformation temperature lies in the change of the matrix composition (or Ni/Ti ratio) with the variation of heat treatment procedure.
文摘The innovative approach imparting strength and toughness to carbon fiber reinforced polymer composites (CFRP) is put forward from the viewpoint of biomimetics. Helical fibers produced by twisting fiber bundle are arranged in the matrix to simulate the unique structure of natural fibers. The results on the CFRP with helical fiber bundles show that, under the same state of strong fiber/matrix interface, the impact fracture toughness can be improved substantially compared to conventional composites with plain fibers. The beneficial effect is attributed to the helical fiber bundles which act as single fibers of huge diameter effectively increasing the fiber elastic energy.
文摘Diamond films have been synthesized by means of LCVD through combined effects of a XeCl ultraviolet laser and an infrared CO2 laser. A special apparatus has been developed. The conditions of synthesis and the roles played by both lasers were studied. High-purity diamond films were deposited on Si substrates at 340 degrees C.
文摘THE self-assembled monolayers (SAMs) emerged in the last decade as one of the most convenient and useful methods of preparing molecularly tailored interfaces with controlled spatial and geometric constraints, and have been examined widely from both fundamental and applied perspectives. Recently, SAMs of both unfunctionalized and redox-attached alkanethiols
文摘THE electrochemical and/or photochemical active organic molecules have attracted much atten-.tion due to their potential applications in the field of molecular electronics. The azobenzenederivatives have been widely studied as typical systems, owing to their reversible trans-cis iso-merization and reduction/oxidation reactions (see fig. 1 (a) ). We have studied the char-acteristic photochromic and electrochemical behavior of azobenzene Langmuir-Blodgett mono-
