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Adhesion and its ten commandments.

C G Matasa
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Abstract

Despite the fact that retention has been widely discussed in many specialty papers, there is still a lack of information regarding it. The author of the following article happens to have been both a designer or orthodontic adhesives for a major manufacturer and a principal scientist of a Fortune 200 company (in charge of adhesion projects like the substitution of riveting through bonding for airplanes and advanced composites metal/plastics). Based upon his experience, he's trying to relate knowledge which is common in the bonding industry to the needs of the orthodontist.

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BibTeXRIS

C G Matasa. 1989. Adhesion and its ten commandments.. https://doi.org/10.1016/0889-5406(89)90171-6

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Air classifier technology (ACT) in dry powder inhalation. Part 1. Introduction of a novel force distribution concept (FDC) explaining the performance of a basic air classifier on adhesive mixtures.

Air classifier technology (ACT) is introduced as part of formulation integrated dry powder inhaler development (FIDPI) to optimise the de-agglomeration of inhalation powders. Carrier retention and de-agglomeration results obtained with a basic classifier concept are discussed. The theoretical cut-off diameter for lactose of the classifier used, is between 35 and 15 microm for flow rates ranging from 20 to 70 l/min. Carrier retention of narrow size fractions is higher than 80% for flow rates between 30 and 60 l/min, inhalation times up to 6s and classifier payloads between 0 and 30mg. The de-agglomeration efficiency for adhesive mixtures, derived from carrier residue (CR) measurement, increases both with increasing flow rate and inhalation time. At 30 l/min, 60% fine particle detachment can be obtained within 3s circulation time, whereas at 60 l/min only 0.5s is necessary to release more than 70%. More detailed information of the change of detachment rate within the first 0.5s of inhalation is obtained from laser diffraction analysis (LDA) of the aerosol cloud. The experimental results can be explained with a novel force distribution concept (FDC) which is introduced to better understand the complex effects of mixing and inhalation parameters on the size distributions of adhesion and removal forces and their relevance to the de-agglomeration in the classifier.

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