Self-assembled Monolayers for Controllable Adhesion of DOPA†

doi:10.7503/cjcu20180291

Abstract

Abstract:

11-Mercapto-1-undecanol and 1-dodecyl mercaptan with —OH or —CH₃ as capping groups respectively were self-assembled onto gold surfaces at molar ratios of 1:0, 3:1, 1:1, 1:3 and 0:1, prepa-ring binary monolayers with various hydrophilic-hydrophobic properties and chemical compositions. The monolayers were characterized by X-ray photoelectron spectroscopy(XPS), contact angle(CA) and atomic force microscope(AFM) methods. The adhesion properties of dopa and liquid phase environment-related water droplets against self-assembled monolayers(SAMs) were also investigated. It can be found that the OH-terminated SAMs had the most superior anti-dopa adhesion ability. With the molar ratio decrease of —OH groups and the introduction of the —CH₃ groups on the surface, the adhesion ability of dopa to the surface is increased. Furthermore, the pure OH-terminated SAMs showed a strongest droplet adhesion performance, and with the molar ratio of —OH groups decreasing, the droplet adhesion to the surface become weak. The introduction of the —CH₃ groups significantly reduced the surface water adhesion. The experimental results showed that the OH- or CH₃-terminated SAMs is difficult to possess anti-dopa and droplet-adhesion properties at the same time and the adhesion ability of the binary mixed SAMs can be adapted to a specific environment, which proposed a new concept for the design and preparation of anti-adhesion materials.

Key words: Dopa, Droplets, Mixed self-assemded monolayers(SAMs), Adhesion

CLC Number:

TrendMD:

MENG Xiufeng,ZHAI Zhiwei,GUO Aijun. Self-assembled Monolayers for Controllable Adhesion of DOPA^†[J]. Chem. J. Chinese Universities, 2018, 39(10): 2245.

Figures/Tables 7

Scheme 1 Scheme of AFM tip preparation

Fig.1 AFM images of different samples under a binary mixture of —OH/—CH3 with molar ratios of 1:0(A), 3:1(B), 1:1(C), 1:3(D) and 0:1(E), respectivelyRMS/nm: (A) 0.582; (B) 0.633; (C) 0.607; (D) 0.667; (E) 0.677.

Fig.2 XPS characterization for different samples under a binary mixture of —OH/—CH3 with molar ratios of 1:0, 3:1, 1:1, 1:3 and 0:1, respectively

Fig.3 Contact angles of different samples under a binary mixture of —OH/—CH3 with molar ratios of 1:0, 3:1, 1:1, 1:3 and 0:1, respectively

Fig.4 Retraction force curves as a function of separation between DOPA-modified AFM tip for different samples under a binary mixture of —OH/—CH3 with molar ratios of 1:0, 3:1, 1:1, 1:3 and 0:1, respectively

Fig.5 Representative histograms of adhesion forces for the different samples(A—E) and comparison of average adhesive forces(F) under a binary mixture of —OH/—CH3 with molar ratios of 1:0(A), 3:1(B), 1:1(C), 1:3(D) and 0:1(E), respectively

Fig.6 Adhesion of water droplets to surface(A) and comparison of average adhesive forces(B) under a binary mixture of —OH:—CH3 with molar ratios of 1:0, 3:1, 1:1, 1:3 and 0:1, respectively

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