查询词典 coprecipitation

The magnetite with a mean diameter of 8nm was prepared by chemical coprecipitation methods. By the addition of nonionized oleic acid to the suspension of magnetite in solution during precipitation, the magnetite nanoparticles were coated with a double surfactant layer. A gel-like precipitated precursor is then formed because of the hydrophobic interaction among those coated units. By transferring of this precursor to an organic solvent, the surfactant double layer on Fe〓O〓 nanoparticles reduces to one; however, it still remains as a double layer by transferring to an alkaline aqueous solution. Both these cases give in stable colloids of superparamagnetic Fe〓O〓 nanoparticles.

从解决无机磁性Fe〓O〓颗粒与有机烯类单体的相容性入手，采用化学共沉淀法，制备了平均直径为8nm的超顺磁性Fe〓O〓颗粒，在制备过程中以非离子形式引入油酸，在Fe〓O〓颗粒表面形成一个具有双层结构的疏水外壳，并通过疏水相互作用凝聚成磁性Fe〓O〓凝胶，能够以单分子层结构形式溶解在非极性溶剂中，也能够以双分子层结构形式溶解在碱性水溶液中，形成稳定的超顺磁性Fe〓O〓溶胶。

Titania-supported nonprecious oxides catalysts have been prepared by impregnation and coprecipitation, respectively, and tested for carbon monoxide oxidation. The supported copper oxide catalyst showed higher catalytic activity for CO oxidation.

对浸渍法和共沉淀法制备得到的各种TiO2负载氧化物催化剂进行了活性组分的筛选，结果发现，两种方法得到的CuO催化剂均具有优良的CO氧化催化性能。

The coprecipitation is based on the formation of water-insoluble inner complex compounds of the trace elements with-SH group-containing reagent and the formation of disulphide directly in the solution owing to the easy oxidizability of the-SH group. During the formation of the solid disulphide phase the trace elements are coprecipitated.

痕量元素和含-SH基团的试剂形成不溶於水的螯合物，由於-SH基团易被氧化从而直接在溶液中形成固相二硫化物，同时将溶液中的痕量元素共沉淀下来。

Some popular seawater phosphate δ^18 O analysis methods were reviewed. Then MAGIC-CePO4 coprecipitation-cation exchange resin separation method was choosed to preconcentrate, separate and purify the phosphate. Some basic experiment conditions were also discussed.

通过对国内外海水中磷酸盐氧同位素组成的测定方法进行查阅，选择改进后的MAGIC-CePO4沉淀－阳离子交换树脂法对海水中溶解态磷酸盐进行富集、分离与纯化，并对实验条件进行了探讨。

L-aspartic acid s are intercalated into magnesium aluminum layered double hydroxidesby using the methods of reprecipitation and coprecipitation.

以镁铝水滑石为插层主体、L-天冬酸离子为插层客体，分别用返混沉淀法和共沉淀法制备了 L-天冬酸根插层镁铝水滑石手性层柱材料，并用 FT-IR、XRD 和 DTA 对其结构进行了表征。

In this paper, strontium lead titanate was prepared from strontium lead titanyl oxalate tetrohydrate by chemical coprecipitation .

采用化学共沉淀法经前驱体草酸氧钛锶铅制得钛酸锶铅粉末。

The barium-strontium titanyl oxalate precursor powder was prepared successfully by using the simple oxalate chemical coprecipitation method. The pyrolysis of BSTO at 905℃ in air produced barium-strontium titanate powder. BST powder was characterized with SEM, TEM, XRD and FT-IR, which revealed that the powder was spherical, highly pure, perovskite, and the average particle diameter was 36nm.

采用草酸盐化学共沉淀法制备了草酸氧钛锶钡前驱体，通过905℃高温煅烧，制得了高纯纳米钛酸锶钡，并利用SEM、TEM、FT-IR和XRD对其进行了表征；并将该粉体应用于水中重金属镉离子的吸附。

The results show that the sample prepared by coprecipitation method exhibits the highest activity and has the largest crystallite size, and after reaction for 140 min, 53.6% of rhodamine B is decolored; while for catalyst prepared by the citric acid complexation, the decoloration ratio is only 9.0%, though the latter has a higher surface area and smaller crystallite size than the former.

研究结果表明：这4种方法均能制备单一的钙钛矿型LaFeO3催化剂，其中，共沉淀法制备的催化剂具有最大的晶粒尺寸，最小的比表面积，仅为0.4 m2/g，显示出最强的光催化活性；在可见光照射下反应140 min，罗丹明B的脱色率达到53.6%。柠檬酸络合法制备的催化剂的比表面积最大，为8.1 m2/g，但其脱色率仅为9.0%。

Ce0.35Zr0.55Y0.07La0.03O1.95(OSM=oxygen storage material), La-Al2O3 were prepared by coprecipitation and peptizing method, respectively. Monolith catalysts of Fe2O3 supported on prepared material were obtained by impregnation method and the catalytic activity for methane combustion under low concentration was investigated.

采用共沉淀法制备了高性能低铈储氧材料Ce0.35Zr0.55Y0.07La0.03O1.95和胶溶法制备了耐高温、高比表面的La-Al2O3并以它们为载体，制备了一系列整体式铁基催化剂。

Nanosized W-Cu powder containing 20 weight percents of Cu was prepared by a homogeneous coprecipitation process,in which Cu2WO42 / CuWO4·2H2O precipitates were first obtained by adding aqua ammonia into a liquor solution containing natrium tungstate and copper chloride and heating the solution to remove ammonia.

采用蒸氨均相共沉淀法，即加热含有Cu2+和WO42-的氨络合物溶液，使氨蒸发，获得沉淀物，然后对沉淀物进行煅烧、还原，最终制得了含Cu量为20%的W-Cu复合粉。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。