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GCMC模擬氣體吸附時各種吸附量該怎么求? 已有3人參與
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Total gas content is defined as the entire quantity of gas that resides in the pore space at a given temperature and pressure and includes both the gas in the center of the pore (i.e., ‘free’ gas) as well as the gas adsorbed directly to the pore surface. Absolute adsorption is defined as the quantity of gas present only in an adsAbsolute adsorptionorbed state. Excess adsorption is defined as the additional amount of gas adsorbed per unit pore volume compared with the amount of gas in the same volume of a given pore in the absence of pore walls. 這3個吸附量在MS軟件sorption模塊中怎么計(jì)算? |


木蟲 (小有名氣)
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多孔材料中,能被原子夠著的地方是pore surface,夠不著的地方是pore(也稱自由體積)。是否能夠著決定于sorption模塊中cutoff distance的設(shè)置,例如默認(rèn)的離原子12.5A以外的地方原子就"夠不著"。 總的氣體吸附應(yīng)該就是材料吸附的總的氣體分子,sorption計(jì)算得到的分子數(shù)目轉(zhuǎn)化成質(zhì)量就行。 Absolute adsorption不懂。 過量吸附指的就是pore surface吸附的氣體,計(jì)算方法是用總的氣體吸附量減去自由體積(原子作用力夠不著的地方)的氣體吸附量?偟奈街苯訌膕orption就可以計(jì)算得出,而自由體積的吸附可以通過用不含任何原子的"空的胞"計(jì)算吸附類比得出,類比需要在同樣壓強(qiáng)和溫度下進(jìn)行,因?yàn)樽杂审w積和"空的胞"一樣,里面吸附(嚴(yán)格來說是"容納")的氣體都不受原子作用力,用吸附分子數(shù)目比等于體積比得出即可。而Tools-Atom Volumes & Surfaces可以用來計(jì)算多孔材料的自由體積大小。 |
木蟲 (小有名氣)
榮譽(yù)版主 (著名寫手)
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