Abstract
Adhesion of zein to solid substrates has been studied using surface energy profiles as indices and by adhesion mapping using atomic force microscopy (AFM). Different plasticizers like glycerol and sorbitol have been used to form mixed films with zein and properties of these films are studied using surface energy profiles. Comparison of the results from the different mixed samples with those from the pure zein films showed that force mapping could identify areas rich in protein. The adhesion maps produced were deconvoluted from sample topography and contrasted with the data obtained from contact angle measurements. A comparison of the two methods shows that the extent of contact angle hysteresis is indicative of both hydrophobicity of the surface as well as the force of adhesion. Mechanical properties and microstructure of zein films prepared by casting from solutions and using Langmuir-Blodgett film technique have been investigated. Pure zein seemed brittle and exhibited an essentially linear relationship between stress and strain. Films with plasticizer were tougher than these films. In general, mixed films showed better mechanical properties than pure films and had higher ultimate tensile strength and increased per cent elongation. Further, the mixed films of zein showed a higher force of adhesion compared to the pure films.
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References
A W Adamson,Physical chemistry of surfaces (Wiley, New York, 1990) p. 493
P Hiemencz and R Rajagopalan,Principles of colloid and surface chemistry (Dekker, New York, 1997) p. 248
A Marmur,Colloids and Surfaces 116, 55 (1996)
D Iwahara, H Shinto, H Miyahara and M Higashitai,Langmuir 19, 9086 (2003)
R Gnanasambandam, N S Hettiarchychy and M Coleman,J. Food Sci. 62, 395 (1997)
G Li, J A Jobin and D D Denton,Appl. Phys. Lect. 64, 560 (1994)
D N S Hon and W Y Chao,J. Appl. Polym. Sci. 50, 17 (1993)
C Della-Volpe, S Siboni and M Morra,Langmuir 18, 1441 (2002)
S Shalel-Levanon and A Marmur,J. Colloid Interface Sci. 262, 489;268, 272 (2003)
R E Johnson and R H Dettre,Surface and colloid science edited by E Matijevic (Wiley-interscience, New York, 1969) p. 85
A Marmur,Adv. Colloid Interface Sci. 50, 121 (1994)
A Marmur,J. Colloid Interface Sci. 168, 40 (1994)
T Yasuda, T Okuno and H Yasuda,Langmuir 10, 2440 (1994)
A MarmurJ. Imaging Sci. Technol. 44, 406 (2000)
C Andrieu, C Sykes and F Brochard,Langmuir 10, 2077 (1994)
A Kawai, H Nagata and H Morimoto,Surf. Modif. Technol. VII, 343 (1994)
A Kawai, H Nagata and M Takata,Jpn. J. Appl. Phys. 31, 3725 (1992)
P J Eaton, P Graham, J R Smith, J D Smart, T G Nevell and J Tsibouklis,Langmuir 16, 7887 (2000)
J P Cleveland, S Manne, D Bocek and P K Hansma,Rev. Sci. Instrum. 64(2), 403 (1993)
O Marti, T Stifter, H Waschipky, M Quitus and S Hild,Colloids Surf. A: Physicochem. Eng. Aspects 154, 65 (1999)
R G Good and C J van Oss,Modern approaches to wettability: Theory and applications edited by M E Schrader and G Loeb (Plenum Press, New York, 1991) pp. 1–27
R G Good, M K Chaudhury and C J Van Oss,Fundamentals of adhesion edited by L H Lee (Plenum Press, New York, 1991) pp. 153–17
M Kanthimathi, R Maheshwari and A Dhathathreyan,Langmuir 19, 3398 (2003)
R Maheshwari and A Dhathathreyan,Langmuir 18, 10039 (2002)
M J Owen, T M Gentle, T Orbeck and D E Williams, Dynamic wettability of hydrophobic polymer, in:Polymer surface dynamics edited by J D Andrade (Plenum Press, New York, 1988) pp. 101–110
R Maheshwari and A Dhathathreyan,J. Colloid Interface Sci. 279, 79 (2004)
R Maheshwari, R Parthasarathy and A Dhathathreyan,J. Colloid Interface Sci. 271, 419 (2004)
F Brochard-Wyat and P G de Gennes,Langmuir 10, 2440 (1994)
P Stokes, M J Higgins, A P Kushnick and S Bhattacharya,Phys. Rev. Lett. 65, 1885 (1990)
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Muthuselvi, L., Dhathathreyan, A. Contact angle hysteresis of liquid drops as means to measure adhesive energy of zein on solid substrates. Pramana - J Phys 66, 563–574 (2006). https://doi.org/10.1007/BF02704499
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DOI: https://doi.org/10.1007/BF02704499