Design and engineering of sculptured nano-structures for application in hydrophobicity

다국어 초록 (Multilingual Abstract)

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.

참고문헌 (Reference)

1 A. Siabi-Garjan, 86 : 257-, 2013

2 H. Lee, 565 : 105-, 2014

3 J. P. Singh, 84 : 3657-, 2004

4 M. Zahir, 346 : 178-, 2015

5 M. Minglin, 11 : 193-, 2006

6 X. Zhang, 18 : 621-, 2008

7 L. Gao, 25 : 14100-, 2009

8 P. Roach, 4 : 224-, 2008

9 S. V. Kesapragada, 6 : 854-, 2006

10 D. Ebert, 368 : 584-, 2012

11 N. Zhao, 38 : 8996-, 2005

12 H. M. Shang, 472 : 37-, 2005

13 F. E. Bartell, 64 : 494-, 1942

14 D. J. Perston, 105 : 0116011-, 2014

15 C. Demangeat, 65 : 1679-, 2002

16 A. Siabi-Garjan, 93 : 3527-, 2013

17 Z. Y. Yuan, 378 : 349-, 2003

18 J. A. Paulsen, 97 : 490-, 2005

19 Y. Kwok, 81 : 167-, 1999

20 F. M. Fowkes, 56 : 40-, 1964

21 F. M. Fowkes, 4 : 155-, 1972

22 F. M. Fowkes, 28 : 493-, 1968

23 D. K. Owens, 13 : 1741-, 1969

24 S. Wu, 34 : 19-, 1971

25 S. Wu, 5 : 39-, 1973

26 H. W. Fox, 7 : 109-, 1952

27 H. W. Fox, 7 : 428-, 1952

28 C. J. van Oss, 111 : 378-, 1986

29 C. C. Sun, 47 : 2533-, 2006

30 R. Messier, 2 : 496-, 1984

31 A. F. Stalder, 286 : 92-, 2006

32 R. Messier, 4 : 490-, 1986

33 H. Savaloni, 46 : 167-, 1995

34 H. Savaloni, 256 : 48-, 1995

35 L. Abelmane, 305 : 1-, 1997

36 C. Yang, 97 : 1161-, 2006

37 M. S. Ambrosia, 282 : 211-, 2013

38 D. Murakami, 30 : 2061-, 2014

39 A. B. D. Cassie, 40 : 546-, 1944

40 R. N. Wenzel, 28 : 988-, 1936

41 B. He, 19 : 4999-, 2003

42 T. Deng, 94 : 1331-, 2009

43 M. Reyssat, 81 : 260-, 2008

44 Y. C. Jung, 57 : 1057-, 2007

45 J. F. Oliver, 59 : 568-, 1977

46 M. Reyssat, 81 : 260061-, 2008

47 Z. Yoshimitsu, 18 : 5818-, 2002

48 N. A. Patankar, 20 : 7097-, 2004

49 N. A. Patankar, 26 : 8941-, 2010

50 N. Zhao, 21 : 4713-, 2005

51 G. Decher, 46 : 321-, 1991

52 H. Savaloni, 257 : 9425-, 2011

53 C. Neinhuis, 79 : 667-, 1997

54 A. Promraksa, 418 : 8-, 2014

55 M. R. Cardoso, 257 : 3281-, 2011

56 K. Liu, 4 : 768-, 2012

57 A. Y. Stark, 16 : 6340-, 2013

58 Y. Liu, 17 : 1071-, 2007

59 T. Kustandi, 17 : 2211-, 2007

60 W. Barthlott, 202 : 1-, 1997

61 L. Feng, 24 : 4114-, 2008

62 M. M. Stanton, 367 : 502-, 2012

63 L. Eckertova, "Physics of Thin Flms" Plenum Press 28-49, 1986

64 H.J. Butt, "Physics and Chemistry of Interfaces" Wiley-VCH Verlag 8-, 2003

65 G. Decher, "Multilayer Thin Films: Sequential Assembly of Nanocomposite Materials" Wiley-VCH 1-, 2002

66 J.N. Israelachvili, "Intermolecular and Surface Forces" Academic Press 223-, 1985

67 C.J. van Oss, "Interfacial Force in Aqueous Media" Taylor & Francis 9-, 2006

68 K.D. Kreuer, "Fuel Cells: Selected Entries from the Encyclopedia of Sustainability Science and Technology" Springer 755-, 2014