Adsorption als Folge von Polarisation

Mechanistic analysis on the effects of salt concentration and pH on protein adsorption onto a mixed-mode adsorbent with cation ligand

“…Therefore, it could be concluded that the multilayer adsorption of BSA occurs mainly through the protein/protein interactions, and the oriented adsorption should be very important for this process. De Boer and Zwikker [18] attributed the multilayer adsorption to the electrical polarization initiated at a solid polar surface, which induced the dipoles in the first layer of molecules which in turn induced the dipoles in the next layer and so on. This polarized process may be the same as the oriented adsorption process of BSA on Streamline Direct HST under the electrostatic repulsion condition.…”

A NEW TREATMENT OF HYGROSCOPIC EQUILIBRIA: APPLICATION TO WALNUTS (JUGLANS REGIA) AND OTHER FOODSa

“…They may be employed : to define limits for the dehydration of fruits, vegetables, nuts, etc. (28); to estimate moisture content changes under any given condition of temperature and humidity (28); to evaluate processing variables and to distinguish differences between grades or varieties of agricultural commodities (23,27); to aid in the selection of packaging materials (23,28); and to define moisture or humidity conditions under which product deterioration (2, 6, 10,19) and microbial growth can be inhibited (5,38,39). In addition, water sorption isotherms of more homogeneous materials, such as natural and synthetic fibres, proteins and other purified materials, can be used in the determination of various physical constants (1, 7, 11, 12, 13,16, 18,24,29,36,40) and to provide information on the mechanisms of moisture binding (2 to 4, 9, 21, 29 to 35,41,46).…”

A Model to Describe Adsorption Isotherms

“…2. form After determining Dm from the temperature and the relative pressure, the product DmrV ads is calculated for the excess surface work F. The capacity V mono , the excess surface lnÉDmÉ Å 0 1 n mono n ads / lnÉDm 0 É, [10] work F mono , and therefore the chemical potential Dm mono are it is possible to determine the amount n mono from a plot of then determined from the minimum in a plot of F as a area and the energy constants. Excluding the Aranovich value, the values for the specific surfaces lie within 10% of function of the adsorbed volume V ads (Fig.…”

“…[10], the following equation is obtained and each other. This error is common in BET calculations and lies within the range of experimental precision.…”