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- 저자 : Mehran Gholipour Shahraki (검색결과 1 건)
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Design and engineering of sculptured nano-structures for application in hydrophobicity
Somaye Hosseini,Hadi Savaloni,Mehran Gholipour Shahraki 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.45 No.-
The design and engineering of suitable structures for enhancement of the hydrophobic property of asurface is one of the most challenging problems. In order to achieve a superhydrophobic structure wehave designed and fabricated Mn nano-sculptured thinfilms with different shapes and dimensions,namely helical squares and helical pentagons on glass substrates. The contact angle (CA) of three liquids;a–bromonaphtalene (apolar), water and formamide (polar) to these surfaces was measured and thesurface free energy was calculated. Changes to the geometry of the structure produced results rangingfrom hydrophilic (CA = 51 ) to superhydrophobic (CA = 152 ). The superhydrophobic structure is a helicalsquare shaped structure with high porosity (deposited at 83 ) which also shows the rose petal effect withthe additional property of high adhesion. The resemblance of this structure to that of gecko feet, whichshows both high adhesion forces and superhydrophobic property is discussed. All structures investigatedin this work showed negative spreading coefficients with highest values for the largest contact angle foreach type/shape of structure. The superhydrophobic sample also acts as a sticky surface which isconfirmed by hysteresis of the contact angle obtained from advancing and receding contact anglesmeasurements. The influence of the volume of liquid drop and different surface morphologies on thewetting transition from Cassie–Baxter to Wenzel states is also reported.
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