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5-7-2004
AL0(OH) DISPERSION ANALYSIS WITH THE SZP-06 - INFLUENCE OF PH (8004)


Using SZP-04 or SZP-06 elecrtodes to analyze alkaline aluminium oxide dispersion and measure the influence of pH.

Introduction Alkaline aluminium oxide has many practical uses and is typically applied for fillers, abrasives, ceramics, adsorbents, adhesives and coatings.

Method Determination of the zeta potential

Sample Dispersion of an aluminum oxide (boehmite)

Solid Content 1 - 65%

Sample Preparation Add 400 ml de-ionized water to 4 g of aluminum oxide and stir for 15 min. Set the conductivity to approx. 150 µS/cm (20 °C) using a (10%) KCl solution. For pH adjustment, add 0.1 M NaOH solution.

Equipment SZP-04 or SZP-06, special electrodes for pigment dispersions, filter circle (white ribbon).

Result The surface charge of aluminum oxide particles is dependent on the suspension pHs. For pHs below approx. 9.1, the studied particle surfaces were found to carry a positive charge, whilst they assumed negative charges at higher pHs when the isoelectricc point was exceeded.

Industrial processes are most frequently run at precisely defined pHs, which makes special demands on the products used.

By determining the zeta potential, the eligibility of an aluminum oxide can be established under process conditions. Specifically, apart from identifying the positive or negative nature of the surface charge, papermakers are able to find out if the process pH happens to coincide with the isoelectric point of the aluminum oxide.

In this latter case, the product would be unsuitable for the intended purpose. Applying the above method of determination, mill technologists are able to select an optimally suited aluminum oxide or else to modify the surface charge by dosing appropriate additives eg dispersants in order to achieve the desired properties.

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