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liuyaxiong

鐵蟲 (初入文壇)

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[求助] 幫忙翻譯一段文字，謝謝�。�

Crystalline Sb doped tin oxide (ATO) , cassiterite structure , is a wide band gap n2type semiconductor. Because of its optical property (transparent for visible light and reflective for IR) and electroconductibility , good chemical and mechanical stability , it has many applications , such as transparent conductive electrodes , photovoltaic devices , photosensors , catalyst , antistatic coatings and electrochromic materials[1- 4 ] . A variety of techniques have been used to prepare ATO superfine powders , some involve dry processes , others are based on wet chemical
processes , including chemical coprecipitation[5] , sol-gelrelated process[6] , emulsion method[7 ] . Compared with dry process , wet chemical process is a low-cost method to fabricate superfine powders. However , the process suffers the disadvantage of producing hard agglomerate during drying and calcining procedures due to the high surface tension stress , physically adsorbed and / or chemically coordinated H2O molecule , and hydroxyl group on hydrate particles surface. The key issue to decrease the agglomeration has been considered to decrease the tension stress and to remove the residual H2O molecule with maximum limit by proper dehydrating process[7 , 8 ] . The dehydrating methods adopted currently include refrigeration drying[9 ] , supercritical drying[10 ] , organic solvent washing and heterogeneous azeotropic distillating[11 ] . The former two kinds of methods which needs specialized equipments , are not used as widespread as the latter two , which are simple and easy to operate. The method of organic solvent washing mainly uses ethanol , isopropanol and acetone to substitute for H2O molecules remained in the gels , but this substitution is limited and the agglomeration can not be completely eliminated. Compared with organic solvent washing method , heterogeneous azeotropic distillation is a more effective anti-agglomeration method. But , up to now , the solvent used in heterogeneous azeotropic distillation mainly is n2butanol . No any other solvents are found to be utilized in the process , and also the report on the preparation of free agglomerate nanometer2sized powder with organic dehydrating agent are not found..
In the present study , nanometer-sized ATO powders are prepared through hydrolysis of metal alkoxides. In order to eliminate the agglomerate , an improved heterogeneous azeotropic distillation process , n-butanol/ xylene mixed solvent heterogeneous azeotropic distillation , and a kind of organic dehydrating agent are used in dehydrating procedure. This paper discusses the effect of the two dehydrating process , compared with other processes , on theproperties of ATO superfine powders. It is found that the n2butanol/ xylene mixed solvent heterogeneous azeotropic
distillation process and organic dehydrating agent can effectively dehydrate , and obtain high performance nanoscaled ATO powders.

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1樓 2010-06-06 10:49:46

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wang_xin

金蟲 (小有名氣)

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wypward(金幣+1):謝謝參與，辛苦啦 2010-06-06 15:23:27

向水晶體Sb中摻雜二氧化錫（ATO），錫石的結(jié)構(gòu)，是一個寬頻帶的半導(dǎo)體。因為它的光學(xué)性能（對可見光透明并且反射紅外線），導(dǎo)電性，很好的化學(xué)穩(wěn)定性，有很多應(yīng)用。例如透明的導(dǎo)電極，光電設(shè)備，感光器，觸媒，抗靜電涂層和電致變色的材料。有很多方法用來制備這種ATO超細粉體，一些涉及干法，其他的是濕化學(xué)過程法，包括化學(xué)共同沉淀，溶膠凝膠，乳濁液法。與干法相比，濕化學(xué)過程是低廉的方法制備這種超細粉體。然而，這個過程也遭受著不利因素，如在干燥和燒結(jié)易產(chǎn)生硬的結(jié)塊，是由于表面高張應(yīng)力，物理吸附和化學(xué)配合的水分子，水合粒子表面的羥基。關(guān)鍵問題在于減少團聚已經(jīng)被認為是最大限度地降低張應(yīng)力，去除殘留的水分子通過合理的脫水過程。脫水方法采用一般包括冷凍干燥，超臨界干燥，有機溶劑洗滌和不同的共沸物蒸餾。前兩種需要特殊的器械，沒有后兩者使用廣泛，后者則簡單易于操作。有機溶劑洗滌主要用乙醇，異丙醇和丙酮，用于替代殘留在凝膠中的水分子。但是這種替代是有限度的，所以結(jié)塊仍然不能完全消除。與有機溶劑洗滌相比，不同的共沸物蒸餾是一個高效的抗結(jié)塊方法。但直至今日，在不同的共沸物蒸餾使用的溶劑主要是丁醇。沒有發(fā)現(xiàn)使用其他的溶劑，報道在制備無結(jié)塊的納米顆粒粉體所用的有機脫水試劑中也沒有發(fā)現(xiàn)。目前的研究，納米粒徑的ATO粉體的制備是通過金屬醇鹽的水解。為了減小結(jié)塊，一個改進的不同的共沸物蒸餾方法，丁醇混合溶劑的不同的共沸物蒸餾，一種有機脫水劑被用在脫水中。這篇文章討論在超細ATO粉體中，兩種脫水過程的效果，與其它的過程相比。發(fā)現(xiàn)丁醇/二甲苯混合溶劑的不同的共沸物蒸餾方法和有機脫水劑是有效的脫水，并獲得高性能的納米級ATO粉體。

累死我了，一句一句翻譯的啊

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2樓2010-06-06 13:43:37

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