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The importance of the production and application of disperse systems in industry is steadily growing, while colloidal systems surround us every day (for example foodstuffs, pharmaceuticals etc.). Understanding the forces and mechanisms of interaction allows the development of new materials and improvement of available systems. The stability of such systems is one of the central research points. One of the well-known physical models of colloid stability is given by DLVO-Theory. With this theory we have a tool to influence the stability of such dispersion systems. In this paper, electrokinetic methods are used to investigate interaction forces in disperse systems. The influence of pH-value, electrolyte concentration and valency is shown with suitable examples. However, in some cases the DLVO-model is not satisfactory, and reasons for this behavior will also be discussed.
The importance of the production and application of disperse systems in industry is steadily growing, while colloidal systems surround us every day (for example foodstuffs, pharmaceuticals etc.). Understanding the forces and mechanisms of interaction allows the development of new materials and improvement of available systems. The stability of such systems is one of the central research points. One of the well-known physical models of colloid stability is given by DLVO-Theory. With this theory we have a tool to influence the stability of such dispersion systems. In this paper, electrokinetic methods are used to investigate interaction forces in disperse systems. The influence of pH-value, electrolyte concentration and valency is shown with suitable examples. However, in some cases the DLVO-model is not satisfactory, and reasons for this behavior will also be discussed.
Herstellung und Einsatz disperser Systeme gewinnen in der Industrie immer größere Bedeutung. Auch im täglichen Leben begegnen wir häufig solchen Systemen (z. B. Nahrungsmittel, Pharmazeutika usw.). Die Erforschung der Gesetzmäßigkeiten der Kolloidchemie ermöglicht, neue Stoffe zu entwickeln oder vorhandene zu verbessern. Ein zentraler Ansatzpunkt hierbei ist die Stabilität solcher kolloidalen Systeme. Eines der physikalischen Modelle zur Kolloidstabiltät liefert die DLVO‐Theorie. Entsprechend den physikalischen Bedingungen einer solchen Stabilisierungsform kann diese in vielfältiger Weise beeinflusst werden. Die hier vorzustellenden Arbeiten befassen sich mit dem Einsatz elektrokinetischer Messmethoden zur Untersuchung der Wechselwirkungskräfte in dispersen Systemen. An Beispielen soll der Einfluss von pH‐Wert, Elektrolytkonzentration und ‐wertigkeit auf die Kolloidstabilität gezeigt werden. Nicht immer erfüllen die untersuchten Dispersionen die Bedingungen des DLVO‐Modells. Ursachen für dieses Verhalten sollen diskutiert werden.
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