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    • 14. 发明申请
    • PROCESS OF MAKING FINE CERAMIC POWDERS FROM AQUEOUS SUSPENSIONS
    • 从水性悬浮液制造精细陶瓷粉的工艺
    • WO1997048641A1
    • 1997-12-24
    • PCT/CA1997000408
    • 1997-06-10
    • CORPORATION DE L'ECOLE POLYTECHNIQUE
    • CORPORATION DE L'ECOLE POLYTECHNIQUEKIRCHNEROVA, JitkaKLVANA, Danilo
    • C01B13/14
    • C04B35/50B01J23/002B01J37/32B01J2523/00C01B13/14C01G3/006C01G37/006C01G51/68C01P2002/34C01P2002/54C01P2002/72C01P2002/88C01P2006/12C01P2006/60C04B35/4508Y10S977/776B01J2523/24B01J2523/36B01J2523/3706B01J2523/67B01J2523/17B01J2523/25B01J2523/845B01J2523/847B01J2523/72B01J2523/842
    • The new preparation process for making fine high specific surface ceramic powders suitable as catalysts or precursors for ceramics uses lanthanum (or other rare earth lanthanide) oxide as one of the precursors. The oxide is mixed with water to form a liquid slurry, whereby it is transformed to the hydroxide by reaction with water. The resulting hydroxide slurry, which can be milled to reduce the particle size and to speed up the reaction, is then combined, while stirring vigorously to assure homogenous mixing, with a solution of required amount of remaining metal nitrate precursors, for example strontium and cobalt nitrates. The reaction between lanthanum hydroxide and transition metal nitrates produces a coloured (colour depending on the transition metal) slurry consisting of metal hydroxides suspended in aqueous nitrate solution with pH > 2. This perovskite precursor slurry is spray-frozen and freeze dried. The freeze-dried material is transformed to perovskite by slow controlled calcination at temperatures above 550 DEG C. For example calcination 12 h at 585 DEG C and subsequently 4 h at 620 DEG C produces nearly phase pure perovskite having specific surface area of > 10 m /g, depending on the composition. The perovskite precursor slurry can alternatively be processed first by spray-drying (instead of spray-freezing/freeze-drying) and subsequent calcination.
    • 用于制备适合作为陶瓷或催化剂前体的精细高比表面陶瓷粉末的新制备方法使用镧(或其它稀土镧系元素)氧化物作为前体之一。 将氧化物与水混合以形成液体浆料,由此通过与水反应将其转化为氢氧化物。 然后将所得氢氧化物淤浆(其可以研磨以减小粒度和加速反应)合并,同时剧烈搅拌以确保均匀混合,与所需量的剩余的金属硝酸盐前体溶液,例如锶和钴 硝酸盐。 氢氧化镧和过渡金属硝酸盐之间的反应产生着悬浮在pH> 2的硝酸盐水溶液中的金属氢氧化物组成的着色(颜色取决于过渡金属)浆料。该钙钛矿前体浆液被喷雾冷冻并冷冻干燥。 通过在高于550℃的温度下缓慢控制煅烧将冷冻干燥的材料转化为钙钛矿。例如在585℃煅烧12小时,随后在620℃焙烧4小时,产生比表面积> 10微米的几乎相纯的钙钛矿 <2> / g,取决于组成。 另外可以通过喷雾干燥(代替喷雾冷冻/冷冻干燥)和随后的煅烧来首先处理钙钛矿前体浆料。
    • 16. 发明申请
    • PINNING AND AFFIXING NANO-ACTIVE MATERIAL
    • 密封和结合纳米活性材料
    • WO2011081834A1
    • 2011-07-07
    • PCT/US2010/059763
    • 2010-12-09
    • SDCMATERIALS LLCYIN, QinghuaQI, XiwangRUIZ, Eliseo
    • YIN, QinghuaQI, XiwangRUIZ, Eliseo
    • H01L21/00
    • B01J23/8926B01J23/42B01J35/0013B01J37/00B01J37/009B01J37/0211B01J37/32B01J37/349B28B23/0087B32B7/12B32B37/14B82Y30/00B82Y40/00C23C4/134
    • A nanoparticle comprises a nanoactive material and a nanosupport. In some embodiments, the nanoactive material is platinum and the nanosupport is alumina. Pinning and affixing the nanoactive material to the nanosupport is achieved by using high temperature condensation technology. In some embodiments, a quantity of platinum and a quantity of alumina are loaded into a plasma gun. When the nanoactive material bonds with the nanosupport, an interface between the nanoactive material and the nanosupport forms. The interface is a platinum alumina metallic compound, which dramatically changes an ability for the nanoactive material to move around on the surface of the nanosupport, providing a better bond than that of a wet catalyst. Alternatively, a quantity of carbon is also loaded into the plasma gun. When the nanoactive material bonds with the nanosupport, the interface formed comprises a platinum copper intermetallic compound, which provides an even stronger bond.
    • 纳米颗粒包含纳米活性材料和纳米载体。 在一些实施方案中,纳米活性材料是铂,纳米载体是氧化铝。 通过使用高温冷凝技术将纳米活性材料固定和固定到纳米载体上。 在一些实施例中,将一定数量的铂和一定量的氧化铝装入等离子体枪。 当纳米活性材料与纳米载体结合时,纳米活性材料和纳米支撑体之间形成界面。 该界面是铂铝氧化物金属化合物,其显着改变纳米活性材料在纳米载体表面上移动的能力,提供比湿式催化剂更好的粘合力。 或者,一定量的碳也被加载到等离子体枪中。 当纳米活性材料与纳米载体结合时,所形成的界面包含铂铜金属间化合物,其提供更强的键。