0 BET
Über ein lineares Regressionsverfahren werden der Ordinatenabschnitt i und die Steigung k bestimmt, aus denen sich die Monoschichtkapazität nmono ( Einheit mmol / g ) nach nmono = 1 / ( i + k ) berechnen lässt.
Die spezifische Oberfläche ergibt sich daraus schließlich unter Einbeziehung des Platzbedarfs σ für ein Adsorptivmolekül in der Monoschicht zu AmonoBET Nna ⋅ ⋅ = σ wobei NA die Avogadro-Konstante ist.
www.bam.deThe plot should give a straight line yBET = i + kx within the so-called BET relative pressure range ( see below ).
Both the intercept a and the slope b, which are determined by means of linear regression, must be positive.From these values, the monolayer capacity nmono ( in mmol / g ) can be calculated according to nmono = 1 / ( i + k ).
The specific surface area aBET is calculated from the monolayer capacity by assessing a value σ for the average area occupied by each molecule in the complete monolayer:
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