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英譯中 三個(gè)簡(jiǎn)短的段落，不勝感激！
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9.5 The computation of mesopore size distribution is valid only if the isotherm is of Type IV. In view of the uncertainties inherent in the application of the Kelvin equation and the complexity of most pore systems, little is to be gained by recourse to an elaborate method of computation. The decision as to which branch of the hysteresis loop to use in the calculation remains largely arbitrary. If the desorption branch is adopted (as appears to be favoured by most workers), it should be appreciated that neither a Type H2 nor a Type H3 hysteresis ioop is likely to yield a reliable estimate of pore size distribution, even for comparative purposes. 9.6 If a Type I isotherm exhibits a nearly constant adsorption at high relative pressure, the micropore volume is given by the amount adsorbed (converted to a liquid volume) in the plateau region, since the mesopore volume and the external surface are both relatively small. In the more usual case where the Type I isotherm has a finite slope at high relative pressures, both the external area and the micropore volume can be evaluated provided that a standard isotherm on a suitable non-porous reference solid is available . At present, however, there is no reliable procedure for the computation of micropore size distribution from a single isotherm; but if the size of the micropores extends down to molecular dimensions, adsorptive molecules of selected size can be employed as molecular probes. 9.7 The following check list is recommended to assist authors in the measurement of adsorption isotherms and the presentation of the data in the primary literature. The reporting of results along generally accepted lines would considerably facilitate the compilation of data in the secondary literature and would thus promote interdisciplinary scientific cooperation (see Note 1). |
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