采用超声悬浮无容器处理技术,并结合高速摄影实时分析方法,研究了丁二腈-樟脑(SCN-DC)共晶型合金在不同声场条件下的液态过冷能力及其结晶过程.实验发现,SCN-10%DC亚共晶、SCN-23.6%DC共晶和SCN-40%DC过共晶合金熔体获得的最大过冷度分...采用超声悬浮无容器处理技术,并结合高速摄影实时分析方法,研究了丁二腈-樟脑(SCN-DC)共晶型合金在不同声场条件下的液态过冷能力及其结晶过程.实验发现,SCN-10%DC亚共晶、SCN-23.6%DC共晶和SCN-40%DC过共晶合金熔体获得的最大过冷度分别达22.5 K (0.07T_(L)),16 K (0.05T_(E))和32.5 K (0.1T_(L)),相应的晶体生长速度各为27.91,0.21和0.45 mm/s.随着声压的增强,合金液滴的径厚比逐渐增大.其过冷度随径厚比的增大先升高后逐渐降低,最后基本保持不变.强声场引起的表面形核率增加以及合金液滴振动是阻碍深过冷的主要因素.展开更多
A new one-dimensional compound [Cd(dafo)(SCN)2]n (dafo=4,5-diazafluoren-9-one) has been synthesized and characterized by single crystal X-ray diffraction. It crystallizes in the orthorhombic system; space group Pbca w...A new one-dimensional compound [Cd(dafo)(SCN)2]n (dafo=4,5-diazafluoren-9-one) has been synthesized and characterized by single crystal X-ray diffraction. It crystallizes in the orthorhombic system; space group Pbca with a=1.708 6(5), b=1.303 6(4), c=2.592 6(8) nm, V=5.775(3) nm3, and Z=16. The crystal structure revealed that the structure of [Cd(dafo)(SCN)2]n features μ-1,3-thiocyante bridges and 1D chains. It consists of octahedrally coordinated Cd atoms. Both Cd(1) and Cd(2) are surrounded by two nitrogen atoms from dafo, two S atoms and two N atoms from two di-μ-1,3 thiocyanato bridges. CCDC: 251185.展开更多
Two_dimensional arrays of Cu and Au nanowires have been fabricated by template synthesis method, using the anodic aluminum oxidation films as the template. The morphology of the nanowire array was monitored by atomic ...Two_dimensional arrays of Cu and Au nanowires have been fabricated by template synthesis method, using the anodic aluminum oxidation films as the template. The morphology of the nanowire array was monitored by atomic force microscope (AFM) in the dissolution processes of the alumina film. Based on the probe molecule strategy, the spectral feature of SCN - adsorbed at the Cu and Au nanowires with different diameters has been investigated by surface enhanced Raman spectroscopy (SERS). The results reveal that the intensity of the SERS bands depends on the length of the exposed nanowires. The C≡N stretching vibration frequency (ν CN ) of SCN - up_shifted significantly with the increase of the diameter of the nanowires in the range of 15 nm to 50 nm. This interesting phenomenon is briefly discussed.展开更多
The method to measure the refractive index of the liquid-state metal is introduced. By inserting a wedge sample cell to the optical path of the Michelson interferometer, the refractive index of the liquid-state alloy ...The method to measure the refractive index of the liquid-state metal is introduced. By inserting a wedge sample cell to the optical path of the Michelson interferometer, the refractive index of the liquid-state alloy SCN-Eth is measured at different temperatures and densities. The results show that this method can be applied to measure the refractive index of various liquids, especially at different temperatures.展开更多
Only one bifunctional metal-chelator was used to prepare immunogen and coating antigen in all of the previous researches. However, the antibody-specific recognition to the spacer arm of the bifunctional metal- chelato...Only one bifunctional metal-chelator was used to prepare immunogen and coating antigen in all of the previous researches. However, the antibody-specific recognition to the spacer arm of the bifunctional metal- chelator might lower the specificity of heavy metal ions immunoassay. Two different bifunctional metal-chelators were adopted to prepare the immunogen and coating antigen respectively in our study to avoid this problem. The conjugates of keyhole limpet hemocyanin （KLH） and p-SCN-Bz-DTPA-Pb were used as immunogen, whereas the conjugates of bovine sentrn albumin （BSA） and p- NH2-Bn-DTPA-Pb were used as coating antigen. Poly- clonal antibodies specific to DTPA-Pb chelates were obtained from rabbits. Indirect competitive enzyme-linked immunosorbent assay （ELISA） was adopted to detect Pb^2＋ ion solutions prepared by Pb^2＋ standard solution and ultrapure water. In the mixing microplate, DTPA and Pb2＋ ions formed chelates and combined with specific anti- bodies. After incubation, the DTPA-Pb and the antibodies complex were added into the wells of the reaction microplate. The reaction microplate was coated by the conjugates ofBSA andp-NH2-DTPA-Pb, which competed for the specific antibodies. The result signals presented a good sigmoid curve when the Pb^2＋ concentration ranges from 0.01 to 100mg·L^-1 The IC50 of the indirect competitive ELISA is 0.23±0.04mg·L^-1 Pb2＋ ion. The cross-reaction with Cd^2＋, Cu^2＋, Fe^2＋, Mn^2＋, Zn^2＋, and other divalent ions were less than 5%.展开更多
开展生物法处理金矿含氰废水同步收金技术研究,通过改良缺氧^(-)好氧生物处理工艺,成功驯化增殖了以硫杆菌、特吕珀菌、假单胞菌为主的CN^(-)、SCN^(-)高效降解菌群。在工业应用上,生物法对SCN^(-)、COD、CN^(-)、NH_(3)-N的平均去除率...开展生物法处理金矿含氰废水同步收金技术研究,通过改良缺氧^(-)好氧生物处理工艺,成功驯化增殖了以硫杆菌、特吕珀菌、假单胞菌为主的CN^(-)、SCN^(-)高效降解菌群。在工业应用上,生物法对SCN^(-)、COD、CN^(-)、NH_(3)-N的平均去除率分别为99.99%、97.54%、93.92%和98.92%,处理后的出水各项污染物指标远低于《污水综合排放标准》(GB 8978—1996)一级标准。微生物在降解废水污染物的同时,通过自身的氧化、吸附、絮凝沉降等作用,对起始浓度低的混合含金废水进行金回收,金的回收率可达到91%,富集金品位300~400 g t,不仅深度处理了废水中各项污染物,同时回收了有价金属,是一种环境友好且无公害的含氰废水处理技术。展开更多
文摘采用超声悬浮无容器处理技术,并结合高速摄影实时分析方法,研究了丁二腈-樟脑(SCN-DC)共晶型合金在不同声场条件下的液态过冷能力及其结晶过程.实验发现,SCN-10%DC亚共晶、SCN-23.6%DC共晶和SCN-40%DC过共晶合金熔体获得的最大过冷度分别达22.5 K (0.07T_(L)),16 K (0.05T_(E))和32.5 K (0.1T_(L)),相应的晶体生长速度各为27.91,0.21和0.45 mm/s.随着声压的增强,合金液滴的径厚比逐渐增大.其过冷度随径厚比的增大先升高后逐渐降低,最后基本保持不变.强声场引起的表面形核率增加以及合金液滴振动是阻碍深过冷的主要因素.
文摘A new one-dimensional compound [Cd(dafo)(SCN)2]n (dafo=4,5-diazafluoren-9-one) has been synthesized and characterized by single crystal X-ray diffraction. It crystallizes in the orthorhombic system; space group Pbca with a=1.708 6(5), b=1.303 6(4), c=2.592 6(8) nm, V=5.775(3) nm3, and Z=16. The crystal structure revealed that the structure of [Cd(dafo)(SCN)2]n features μ-1,3-thiocyante bridges and 1D chains. It consists of octahedrally coordinated Cd atoms. Both Cd(1) and Cd(2) are surrounded by two nitrogen atoms from dafo, two S atoms and two N atoms from two di-μ-1,3 thiocyanato bridges. CCDC: 251185.
文摘Two_dimensional arrays of Cu and Au nanowires have been fabricated by template synthesis method, using the anodic aluminum oxidation films as the template. The morphology of the nanowire array was monitored by atomic force microscope (AFM) in the dissolution processes of the alumina film. Based on the probe molecule strategy, the spectral feature of SCN - adsorbed at the Cu and Au nanowires with different diameters has been investigated by surface enhanced Raman spectroscopy (SERS). The results reveal that the intensity of the SERS bands depends on the length of the exposed nanowires. The C≡N stretching vibration frequency (ν CN ) of SCN - up_shifted significantly with the increase of the diameter of the nanowires in the range of 15 nm to 50 nm. This interesting phenomenon is briefly discussed.
文摘The method to measure the refractive index of the liquid-state metal is introduced. By inserting a wedge sample cell to the optical path of the Michelson interferometer, the refractive index of the liquid-state alloy SCN-Eth is measured at different temperatures and densities. The results show that this method can be applied to measure the refractive index of various liquids, especially at different temperatures.
文摘Only one bifunctional metal-chelator was used to prepare immunogen and coating antigen in all of the previous researches. However, the antibody-specific recognition to the spacer arm of the bifunctional metal- chelator might lower the specificity of heavy metal ions immunoassay. Two different bifunctional metal-chelators were adopted to prepare the immunogen and coating antigen respectively in our study to avoid this problem. The conjugates of keyhole limpet hemocyanin （KLH） and p-SCN-Bz-DTPA-Pb were used as immunogen, whereas the conjugates of bovine sentrn albumin （BSA） and p- NH2-Bn-DTPA-Pb were used as coating antigen. Poly- clonal antibodies specific to DTPA-Pb chelates were obtained from rabbits. Indirect competitive enzyme-linked immunosorbent assay （ELISA） was adopted to detect Pb^2＋ ion solutions prepared by Pb^2＋ standard solution and ultrapure water. In the mixing microplate, DTPA and Pb2＋ ions formed chelates and combined with specific anti- bodies. After incubation, the DTPA-Pb and the antibodies complex were added into the wells of the reaction microplate. The reaction microplate was coated by the conjugates ofBSA andp-NH2-DTPA-Pb, which competed for the specific antibodies. The result signals presented a good sigmoid curve when the Pb^2＋ concentration ranges from 0.01 to 100mg·L^-1 The IC50 of the indirect competitive ELISA is 0.23±0.04mg·L^-1 Pb2＋ ion. The cross-reaction with Cd^2＋, Cu^2＋, Fe^2＋, Mn^2＋, Zn^2＋, and other divalent ions were less than 5%.
文摘开展生物法处理金矿含氰废水同步收金技术研究,通过改良缺氧^(-)好氧生物处理工艺,成功驯化增殖了以硫杆菌、特吕珀菌、假单胞菌为主的CN^(-)、SCN^(-)高效降解菌群。在工业应用上,生物法对SCN^(-)、COD、CN^(-)、NH_(3)-N的平均去除率分别为99.99%、97.54%、93.92%和98.92%,处理后的出水各项污染物指标远低于《污水综合排放标准》(GB 8978—1996)一级标准。微生物在降解废水污染物的同时,通过自身的氧化、吸附、絮凝沉降等作用,对起始浓度低的混合含金废水进行金回收,金的回收率可达到91%,富集金品位300~400 g t,不仅深度处理了废水中各项污染物,同时回收了有价金属,是一种环境友好且无公害的含氰废水处理技术。
