锤子
Cotton sheeting was tested for contact angle and absorption using a customer supplied ink as the test fluid. Two samples were provided: one had a special treatment and the other did not. Small droplets, in the 2 to 3μl volume range, were deposited on the sample by positioning the dispense tip just above the surface and growing the pendant drop until its bottom touched the sample and the drop detached. The image below shows a typical drop just before detachment.
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