The Preparation of Flexible Collodion Membranes
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The Preparation of the Graded Collodion Membranes of Elford and Their Use in the Study of Filterable Viruses
1. The method described by Elford for the preparation of graded collodion membranes suitable for ultrafiltration was found to give excellent results, and his findings are fully confirmed. 2. A formula is given for the preparation of collodion from which satisfactory membranes of graded porosity can be prepared. 3. The technique and apparatus used in the preparation, and standardization of membr...
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The preceding paper 1 of this series describes the preparation of "megapermselective" collodion membranes which are extremely impermeable to anions, but at the same time are very permeable to univalent cations. The purpose of the present paper is to describe the preparation and the properties of analogous electropositive "megapermselecfive" membranes which are very impermeable to cations, but a...
متن کاملStructure of T H E Collodion Membrane and Its Electrical Behavior Vi
Previous publications 1, ~ in this series have dealt with the preparation and electrochemical properties of the activated (electronegative) collodion membrane. The activation consisted of an oxidation of the nitrocellulose, a process which caused an increase in the number of dissociable groups in the pores of the membrane. Such membranes show more pronounced effects than similar untreated membr...
متن کاملCollodion Membrane and Its Electrical Behavior
Previous publications 1, ~ in this series have dealt with the preparation and electrochemical properties of the activated (electronegative) collodion membrane. The activation consisted of an oxidation of the nitrocellulose, a process which caused an increase in the number of dissociable groups in the pores of the membrane. Such membranes show more pronounced effects than similar untreated membr...
متن کاملThe Structure of the Collodion Membrane and Its Electrical Behavior v. the Influence of the Thickness of Dried Collodion Membranes upon Their Electromotive Behavior by Karl Sollner and Charles W. Carr
The electrochemical properties of collodion membranes are known to vary greatly with the nature of the collodion preparation used, more acid preparations yielding membranes of higher electrochemical activity, x-s The assumption has always been made, tacitly or expressly, that the thickness of the membrane is of no influence. Thus, it has been generally assumed that the characteristic concentrat...
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تاریخ انتشار 2003