Yawen W Chan

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The primary role of lung surfactant is to reduce surface tension at the air-liquid interface of alveoli during respiration. Axisymmetric drop shape analysis (ADSA) was used to study the effect of poly(ethylene glycol) (PEG) on the rate of surface film formation of a bovine lipid extract surfactant (BLES), a therapeutic lung surfactant preparation. PEG of(More)
Silicone gels provide the dielectric insulation in insulated gate bipolar transistor (IGBT) power modules to prevent partial discharge, inhibit moisture ingress and keep out contaminants from the internal circuitry. The junction temperatures of these power modules are located between 150<sup>o</sup>C and 175<sup>o</sup>C and these temperatures will increase(More)
Plasma modification is used to alter surface chemical and physical properties of substrates to improve specific characteristics including adhesion and biocompatibility. Such stable and highly cross-linked coatings produced via high discharge power, however, results in a low concentration of reactive chemical functionalities on the surface. Here, we carried(More)
Existing methodology for surface tension measurements based on drop shapes suffers from the shortcoming that it is not capable to function at very low surface tension if the liquid dispersion is opaque, such as therapeutic lung surfactants at clinically relevant concentrations. The novel configuration proposed here removes the two big restrictions, i.e.,(More)
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