摘要:
Polyester nanocomposite compositions contain silica nanoparticles that have been subjected to surface treatment with novel trialkoxysilane compositions. The novel silane compositions are prepared by reacting a 3-isocyanatopropyl trialkoxysilane with 1,3-propanediol or certain polyether diols. The silica nanoparticles exhibit improved dispersion in the polyester. This leads to haze reduction and improvements in mechanical properties.
摘要:
A method wherein an aqueous solution of a fluoride, an aqueous solution of a host multi-valent metal salt and, optionally, an aqueous solution of a rare-earth metal dopant form a precipitate and wherein increasing the concentration of at least one of the group selected from the aqueous solution of the fluoride or the host multi-valent metal salt within the concentration range achieves smaller particles; or wherein decreasing the concentration of at least one of the group selected from the aqueous solution of the fluoride or the host multi-valent metal salt within the concentration range achieves larger particles.
摘要:
Novel silane compositions have been prepared by reacting a 3-isocyanatopropyl trialkoxysilane with an alcohol or diol having a divalent alkylene or alkylene-ether group. The alcohol or diol has a formula weight less than about 5000. The compositions can be used to modify the surfaces of inorganic oxygen-containing materials, including but not limited to silica, silicates, borosilicates, aluminosilicates, days, and metal oxides. Surface treatment of silica nanoparticles with these compositions improves their improved dispersion in polyester nanocomposites.
摘要:
Polyester nanocomposite compositions contain silica nanoparticles that have been subjected to surface treatment with novel trialkoxysilane compositions. The novel silane compositions are prepared by reacting a 3-isocyanatopropyl trialkoxysilane with 1,3-propanediol or certain polyether diols. The silica nanoparticles exhibit improved dispersion in the polyester. This leads to haze reduction and improvements in mechanical properties.
摘要:
A method wherein an aqueous solution of a fluoride, an aqueous solution of a Group 2 or Group 3 metal salt, and an aqueous solution of a rare-earth metal dopant are combined to form a precipitate of a rare-earth doped Group 2 or Group 3 metal fluoride, and wherein increasing the concentration of the rare-earth dopant cation increases the resulting particle size, and wherein decreasing the concentration of the rare-earth dopant cation decreases the particle size.
摘要:
The invention is directed a composition represented by the chemical formula EuxA1−xF2+x−2yOy wherein A is alkaline earth, 0.002≦x≦0.20, and 0≦y≦x; the composition exhibiting a luminescence spectrum characterized by peaks at 592±2 nm and 627±2 nm, wherein the ratio of the peak intensity at 592±2 nm to that at 627±2 nm is at least 5% larger than the corresponding peak intensity ratio at the same wavelengths of a first corresponding reference composition with the same value of x that has not been exposed to a temperature above 100° C., and wherein said ratio of the peak intensity at 592±2 nm to that at 627±2 nm is at least 5% smaller than the corresponding peak intensity ratio at the same wavelengths of a second corresponding reference composition with the same value of x that has been subject to heating to 900° C. for 6 hours.
摘要翻译:本发明涉及由化学式EuxA1-xF2 + x-2yOy表示的组合物,其中A为碱土金属,0.002≤x≤0.20,0 <= y <= x; 该组合物表现出以592±2nm和627±2nm的峰为特征的发光光谱,其中592±2nm处的峰强度与627±2nm处的峰强度的比例比相应的峰强度至少大5% 在相同波长的相同波长处的相同波长的第一对应参考组合物具有未暴露于高于100℃的温度的相同的x值,并且其中所述592±2nm处的峰强度与627±2nm处的峰强度比 nm相对于第二相对应参考组合物的相同波长的相应峰强度比例至少比具有与900℃加热6小时相同的x值。
摘要:
Novel silane compositions have been prepared by reacting a 3-isocyanatopropyl trialkoxysilane with an alcohol or diol having a divalent alkylene or alkylene-ether group. The alcohol or diol has a formula weight less than about 5000. The compositions can be used to modify the surfaces of inorganic oxygen-containing materials, including but not limited to silica, silicates, borosilicates, aluminosilicates, days, and metal oxides.Surface treatment of silica nanoparticles with these compositions improves their improved dispersion in polyester nanocomposites.
摘要:
The invention is directed to a process of combining an aqueous solution of a fluoride with an aqueous solution of a host multi-valent metal salt and an aqueous solution of a salt forming a reactant mixture resulting in a precipitate of aqueously insoluble rare-earth doped multi-valent metal fluoride nanoparticles.
摘要:
The present invention relates to syntheses of nano-sized iron particles formed by mixing a source of ferrous iron with a combination of reducing agent and base, and the particles formed therefrom.
摘要:
The invention is directed to a process of combining an aqueous solution of a fluoride with an aqueous solution of a host multi-valent metal salt and an aqueous solution of a salt forming a reactant mixture resulting in a precipitate of aqueously insoluble rare-earth doped multi-valent metal fluoride nanoparticles.