The reactions of the four-coordinated macrocyclic copper complex [CuL](ClO4)2(L = 1,4,8,11-tetraazacyclotetradecane) with NH4VO3 under different conditions gave three inorganic-organic hybrid materials of [CuL][VO...The reactions of the four-coordinated macrocyclic copper complex [CuL](ClO4)2(L = 1,4,8,11-tetraazacyclotetradecane) with NH4VO3 under different conditions gave three inorganic-organic hybrid materials of [CuL][VO3]2·2.33H2O(1), [CuL]3[V(10)O(28)]·8H2O(2) and [Cu L]3[V6O(18)]·8H2O(3). Single-crystal X-ray diffraction analyses reveal that three diverse vanadium polyoxoanions, [V6O(18)]6- ring, [V(10)O(28)]6- cluster, and [V(12)O(35)]^10- ring, were isolated from the same reactant NH4VO3 under different conditions. The [CuL]^2+ bridges the [V10O28]6- clusters to form a two-dimensional sheet in 2, and link the [V6O(18)]^6- rings in 1 and [V(12)O(35)]^10- rings in 3 into three-dimensional frameworks, respectively.展开更多
Moolooite particles with flaky morphology were synthesized by mixing dilute solutions of copper nitrate and sodium oxalate in the presence of citric acid. Solution p H value, citric acid concentration, and stirring we...Moolooite particles with flaky morphology were synthesized by mixing dilute solutions of copper nitrate and sodium oxalate in the presence of citric acid. Solution p H value, citric acid concentration, and stirring were found to have large effect on the shape of the precipitated particles. Under the stirring, the radial area of flaky moolooite particles was enlarged and extended to become a thinner and larger flake. This is ascribed to growth promotion caused by the selective absorption of citric ligands onto a particular crystalline surface of the moolooite particles. Flaky shape of the moolooite particles tended to become spherical and disappeared completely when decomposed under an Ar atmosphere, leading to the formation of large porous aggregated particles composed of many tiny nanosized copper crystals.展开更多
A copper coating was deposited by electroless plating on the surfaces of urea-formaldehyde microcap- sules containing paraffin (UFP) particles. This composite microcapsule structure had low infrared OR) emissivity ...A copper coating was deposited by electroless plating on the surfaces of urea-formaldehyde microcap- sules containing paraffin (UFP) particles. This composite microcapsule structure had low infrared OR) emissivity and maintained a constant temperature, and could be used in IR stealth applications. The eiectroless copper layer formation and its micro-appearance, and the effect of the copper layer on the IR emissivity and thermal properties of the composite microcapsules were investigated. The IR emissivity of the composite microcapsules at wavelengths of 1-14 μm gradually decreased with increasing copper mass on the surface. After formation of an integrated copper layer, the rate of IR emissivity decrease was lower. This is because the copper coating improves the surface conductivity of the UFP; a high conductivity results in high reflectivity, which leads to a decrease in IR emissivity. The lowest IR emissivity achieved was 0.68. The phase-change enthalpy of the composite microcapsules decreased with increasing amount of copper coated on the surface because of the high density of copper. When the mass increase of the UFP after electroless copper plating was about 300%, the composite microcapsules had low IR emissivity (about 0.8) and a high phase-change enthalpy (80J/g).展开更多
基金Supported by the Opening Project of Key Laboratory of Comprehensive Utilization of Advantage Plants Resources in Hunan South(XNZW14C08)the NSF of Hunan Province(2015JJ2072)+2 种基金the Construct Program of the Key Discipline in Hunan Provincethe Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Provincethe Project for Undergraduate Research Study and Innovative Experiment of Hunan Provincial(2016-283)
文摘The reactions of the four-coordinated macrocyclic copper complex [CuL](ClO4)2(L = 1,4,8,11-tetraazacyclotetradecane) with NH4VO3 under different conditions gave three inorganic-organic hybrid materials of [CuL][VO3]2·2.33H2O(1), [CuL]3[V(10)O(28)]·8H2O(2) and [Cu L]3[V6O(18)]·8H2O(3). Single-crystal X-ray diffraction analyses reveal that three diverse vanadium polyoxoanions, [V6O(18)]6- ring, [V(10)O(28)]6- cluster, and [V(12)O(35)]^10- ring, were isolated from the same reactant NH4VO3 under different conditions. The [CuL]^2+ bridges the [V10O28]6- clusters to form a two-dimensional sheet in 2, and link the [V6O(18)]^6- rings in 1 and [V(12)O(35)]^10- rings in 3 into three-dimensional frameworks, respectively.
基金financially supported by the Fundamental Research Funds for the Central Universities of China (FRF-BD-15-004A)
文摘Moolooite particles with flaky morphology were synthesized by mixing dilute solutions of copper nitrate and sodium oxalate in the presence of citric acid. Solution p H value, citric acid concentration, and stirring were found to have large effect on the shape of the precipitated particles. Under the stirring, the radial area of flaky moolooite particles was enlarged and extended to become a thinner and larger flake. This is ascribed to growth promotion caused by the selective absorption of citric ligands onto a particular crystalline surface of the moolooite particles. Flaky shape of the moolooite particles tended to become spherical and disappeared completely when decomposed under an Ar atmosphere, leading to the formation of large porous aggregated particles composed of many tiny nanosized copper crystals.
文摘A copper coating was deposited by electroless plating on the surfaces of urea-formaldehyde microcap- sules containing paraffin (UFP) particles. This composite microcapsule structure had low infrared OR) emissivity and maintained a constant temperature, and could be used in IR stealth applications. The eiectroless copper layer formation and its micro-appearance, and the effect of the copper layer on the IR emissivity and thermal properties of the composite microcapsules were investigated. The IR emissivity of the composite microcapsules at wavelengths of 1-14 μm gradually decreased with increasing copper mass on the surface. After formation of an integrated copper layer, the rate of IR emissivity decrease was lower. This is because the copper coating improves the surface conductivity of the UFP; a high conductivity results in high reflectivity, which leads to a decrease in IR emissivity. The lowest IR emissivity achieved was 0.68. The phase-change enthalpy of the composite microcapsules decreased with increasing amount of copper coated on the surface because of the high density of copper. When the mass increase of the UFP after electroless copper plating was about 300%, the composite microcapsules had low IR emissivity (about 0.8) and a high phase-change enthalpy (80J/g).