查询词典 reprecipitation

There was no residue or few from asphaltene reprecipitation after acidolysis asphaltene, and using fatty acids were extracted by hexane.

结果表明，相同阳离子的不同羧酸盐活化能和频率因子分布特征相似，拥有相同的均值，不同之处在于短链的比长链的羧酸盐振荡幅度宽；不同阳离子的同种羧酸盐，活化能和频率因子分布却相差很大。

Divinylpyridine-9,9′-diethylfluorene nanoparticles were prepared by reprecipitation method.

利用二次沉淀法制备出不同粒径(101.6~516.9nm)的2，7-二乙烯吡啶基-9，9′-二乙基芴有机纳米微粒。

During Ostwald ripening, higher pH value and temperature enhance the velocity of dissolution–reprecipitation. Increasing of pH value and temperature will promote the Ostwald ripening of theγ-AlOOH.

当反应溶液的pH值为4，γ-AlOOH的熟化过程进行得不充分；当反应溶液的pH值升高至5，γ-AlOOH的熟化过程进行得较充分。

In part one, we prepared three ramification of pyrene nanoparticles by reprecipitation method under ultrasonic radiationand characterized with TEM.The determination of organic nanoparticles to DNA, NO2 -,and nucleic acids werestudied by using fluorescence. And some ultrasensitive determination of DNA, NO_2~-, and nucleic acids methods were proposed. The possible mechanism has been studied.

第一部分在超声辐射下用再沉淀的方法制备了几种芘的衍生物的纳米粒子荧光探针，并通过透射电镜进行了表征，并通过荧光法研究了它们分别与蛋白质、核酸以及NO_2~–的作用，建立了超灵敏的检测上述物质的方法，探讨了作用机理，并提出了合理的解释。

TPA-PPV (M_W of 3000-4000 g/mol) is a good kind of polymeric light-emitting diodes material and has a high photoluminescent quantum yield, we prepared a series of TPA-PPV nanoparticles with diameters ranging from 20 to 100 nm by reprecipitation method.

结果如下： 1、以一种低分子量聚合物绿色电致发光材料TPA-PPV为目标分子，平均分子量为3000—4000，具有很高的荧光量子产率。

Reprecipitation. nanoparticles. size effects. organic light-emitting diodes.

有机超微粒，尺寸效应，自组装，有机电致发光二极管

Fe and Al in the system were removed by precipitation at pH≈5. Co2 was obtained by precipitation at pH=9.5~10, it was then purified by reprecipitation. Co3O4 was obtained by calcining Co2 at 500℃ for 2h, the purity of which was 99.3%. The recovery rate of Co was 97%. Li2CO3 was obtained by adding Na2CO3 to the mother liquor, the purity of which was 97.8%. The one-time recovery for Li was 73%. The mother liquor can be reused after being cooled to below 10℃ and Na2SO410H2O is recovered.

体系中的Fe、Al从杂质在pH≈5时沉淀除去；Co2在pH为9.5~10沉淀得到，经酸溶解后二次沉淀提纯，500℃煅烧2.0h得Co3O4，其纯度达到99.3%，钴的回收率达97%，母液中Li离子加Na2CO3处理，沉淀得Li2CO3，其纯度达97.8%，锂的一次回收率达73%，母液经冷却至10℃以下除去Na2SO410H2O后可循环使用。

Then, nanoparticles were prepared with a reprecipitation method and tested. We found that the nanoparticles with small size and lower poly-dispersion index can be prepared though shortening deposited time, decreasing concentration, increasing deposited temperature and adding surfactant.

利用二次沉淀法制备出三种有机分子不同粒径的纳米微粒，通过改变时间、浓度、温度、表面活性剂等实验条件分析这些因素对纳米微粒粒度的影响，发现缩短放置时间、减少有机稀溶液的注入量、升高放置温度、加入表面活性剂可以得到小粒度，低分散度的纳米微粒。

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。

Keywords Fluorescence spectrum;Nanoparticle;Reprecipitation;Charge-transfer

荧光光谱；纳米颗粒；二次沉淀法；电荷转移

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！