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The movement of decanol droplets on surfaces with a chemically patterned energy gradient

Slootheer, I.B. and Markink, M.H. (2012) The movement of decanol droplets on surfaces with a chemically patterned energy gradient.

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Abstract:In this report, droplet movement due to a gradient in surface energy is studied. The droplet is a 2µl 1-decanol droplet. The gradient is created by forming an array of different chemically striped patterns with alternating hydrophobic and hydrophilic stripes, allowing for reproducible gradients. The hydrophobic stripes are selfassembled monolayers made of hydrophobic uorinated molecules, while the hydrophilic stripes are the bare SiO2 surface of the wafer. The ration α, defined as the width of the hydrophobic stripes divided by the width of the hydrophilic stripes, is a key parameter that influences the dynamics of the droplet moving on a surface with a surface energy gradient. Another key parameter for the droplet movement is the absolute width of the hydrophobic and hydrophilic stripes. The movement of the droplet is influenced by the patterned surface underneath the droplet. The droplet tends to move more easily over patterns with wide SiO2 stripes. The length of the individual patterns influences the droplet motion as well.
Item Type:Essay (Bachelor)
Faculty:TNW: Science and Technology
Subject:33 physics
Programme:Applied Physics BSc (56962)
Link to this item:http://purl.utwente.nl/essays/62102
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