The wettability of Tungsten needles can affect their performance in microscale fluid handling applications. The surface of a Tungsten needle can be modified to achieve different levels of wettability by applying various surface coatings or treatments. For example, a hydrophobic coating can be applied to repel water or other polar fluids, while a hydrophilic coating can be applied to enhance wetting and capillary flow of the fluid along the needle. The choice of wettability also depends on the specific fluid being handled and the desired flow behavior. Therefore, Tungsten needles can be customized to achieve the desired wettability for different microscale fluid handling applications.
