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paul9979金蟲(chóng) (小有名氣)
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[求助]
麻煩英語(yǔ)高手幫忙翻譯下,謝謝!
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| The membranes have been used for alcohol/water pervaporation. The membranes are highly selective for water and show selectivities >3100 for water using(90/10) ethanol/water feed systems. In permeation measurements , these membranes show no selectivities other than Knudsen for permanent gases. Unlike Knudsen diffusion, these membranes show increasing permeation with increasing temperature. This indicates the probability of small defects in the films around 10 Å. The defects shown by the gas permeation measurements indicate that cracks have formed in the membranes, possibly upon drying. It is believed that these are caused by the contraction of the zeolite NaA structure upon removal of water, which gives a 0.16% contraction in the dimensions of the unit cell. |
金蟲(chóng) (初入文壇)
| 細(xì)胞膜參與醇/水滲透蒸發(fā)。細(xì)胞膜對(duì)水具有高度選擇性,在乙醇/水為90/10的供應(yīng)系統(tǒng)中細(xì)胞膜表現(xiàn)出對(duì)水大于3100的選擇性。在滲透測(cè)量中,除了對(duì)永久性氣體的努森作用外,這些細(xì)胞膜并未顯示出選擇性。與努森擴(kuò)散不同的是,這些細(xì)胞膜的滲透能力隨溫度升高而升高。(就翻譯到這,后面沒(méi)看太明白。 |
木蟲(chóng) (正式寫(xiě)手)
| 這些膜已被用于乙醇/水的滲透汽化。膜對(duì)水具有高度選擇性,當(dāng)給水系統(tǒng)為乙醇/水比例(90/10) 時(shí),膜對(duì)水的選擇性>3100 。在滲透量測(cè)量中,這些膜沒(méi)表現(xiàn)出選擇性,除 Knudsen對(duì)永久性氣體具有選擇性。與Knudsen擴(kuò)散不同,隨溫度升高,膜的滲透量增加,這表明膜上可能存在10埃左右大小的破損;跉怏w滲透量測(cè)量所顯示的破損,表明膜上已經(jīng)形成裂痕,這可能是在烘干后形成的。這些被認(rèn)為是在除去水分時(shí)NaA型沸石的結(jié)構(gòu)收縮造成的,其單位晶胞的尺寸收縮達(dá)0.16%。 |

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