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ankang276金蟲(chóng) (正式寫(xiě)手)
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[交流]
求助翻譯一段英譯漢
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As Fig. 2 shows, starting from nutrients, hydrolysis, silica oligomerization and condensation reactions catalyzed by hydroxyls lead to entities of different size (and hence stability) and order. Depending on the synthesis conditions (pH, temperature,and presence of structure-directing agents) an amorphous phase can be obtained as either intermediate phase (which would either transform into a crystalline phase or dissolve to be incorporated into a more stable product) or final product. In this scheme, the role of hydroxyl ions has been well described in breaking and remaking Si,Al–Si,Al bonds in the corresponding condensation and rearranging reactions leading to pre-nuclei and then to nuclei particles; the concept of hydrophobic hydration has been introduced to explain how some organic molecules can organize silica and how others cannot ; and finally subcolloidal or precursor nanoparticles which could be the previously mentioned pre-nuclei have been identified by means of NMR, TEM, DLS and SAXS techniques . In fact, some of these particles, called nanoslabs (slab shaped particles), have been claimed to be of defined sizes of 1.3 nm × 4 nm × 4 nm, each one containing a TPA+ cation , even if this finding has been the subject of serious controversy .Another aspect recently introduced is the concept of molecular recognition to describe the early interaction between silica complexes and template molecules to form clusters from which ordered structures may grow . |
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我翻譯了一點(diǎn),供樓主參考。一些專(zhuān)業(yè)術(shù)語(yǔ)不熟,還請(qǐng)見(jiàn)諒。最后兩句理解起來(lái)不難,樓主自己譯一下,我的時(shí)間不夠用了。 如圖2所示,溶液中反應(yīng)物經(jīng)水解和羥基催化的二氧化硅低聚和縮合反應(yīng)后形成具有不同尺寸(因而穩(wěn)定)和結(jié)構(gòu)順序的物質(zhì)。根據(jù)合成的工藝條件(pH,溫度和結(jié)構(gòu)導(dǎo)向劑的使用),非晶相物質(zhì)要么由中間相(它可以轉(zhuǎn)變?yōu)榫嗷蛘叻纸夂笾匦潞喜⒊筛臃(wěn)定的物質(zhì))得到,要么由最終產(chǎn)物得到。該圖中,很好地描述了氫氧根離子在聚合和重組反應(yīng)(這些反應(yīng)會(huì)使晶核預(yù)先生成,進(jìn)而成為晶粒)中對(duì)Si,Al–Si,Al鍵的斷裂和重排的作用。接著,疏水水化的概念被引入到解釋為什么一些有機(jī)分子能夠使二氧化硅有序化而其他有機(jī)分子不行。最后,subcolloidal或前體納米粒子(這可能是前面提到的預(yù)先生成的晶核)通過(guò)核磁共振,透射電鏡,動(dòng)態(tài)光散射和SAXS技術(shù)進(jìn)行表征。 |
木蟲(chóng) (正式寫(xiě)手)
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如圖2所示,營(yíng)養(yǎng)劑(即源物質(zhì)),經(jīng)由羥基催化的水解反應(yīng),硅低聚以及縮合反應(yīng),生成不同粒徑和次序的物質(zhì)。反應(yīng)會(huì)生成非晶相(無(wú)定形相),由于合成條件(pH,溫度,和存在的結(jié)構(gòu)導(dǎo)向劑)的不同,非晶相可能是最終產(chǎn)品或者中間產(chǎn)物(中間產(chǎn)物會(huì)轉(zhuǎn)化成晶體或者溶解進(jìn)入到更穩(wěn)定的產(chǎn)品中)。 圖中這個(gè)方案,很好的詮釋了氫氧根離子的作用,它的作用是在相應(yīng)的縮合和重排反應(yīng)中打開(kāi)和重組Si,Al–Si,Al鍵,而縮合和重排反應(yīng)導(dǎo)致了預(yù)晶核乃至進(jìn)一步晶核的生成。疏水水合反應(yīng)概念的提出,可以解釋為什么有些有機(jī)物質(zhì)可以將硅組織起來(lái)而其他物質(zhì)不可以。最后,準(zhǔn)膠體或者前驅(qū)體納米粒子(可以是之前提到的預(yù)晶核),通過(guò)核磁共振(NMR),透射電鏡(TEM),動(dòng)態(tài)光散射(DLS)和小角X射線衍射(SAXS)等分析手段進(jìn)行識(shí)別。 實(shí)際上,其中的一些粒子,叫做納米片晶(片狀粒子),已經(jīng)被解釋為:1.3 nm × 4 nm × 4 nm大小,每個(gè)粒子包含一個(gè)TPA+陽(yáng)離子,即使這一解釋引起了極大的爭(zhēng)議。另外一方面,最近提出的分子識(shí)別,是用來(lái)描述早期硅的復(fù)雜結(jié)構(gòu)和模板劑分子形成簇的反應(yīng),簇然后可以生長(zhǎng)成有序結(jié)構(gòu)。 |
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