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	Chemical force titration of conjugated pyridyl group-terminated self-assembled monolayers
	He, HX ; Zhang, H ; Wang, YC ; Liu, ZF
	1999
关键词	chemical force titration contact angle titration surface pK(1/2) MICROSCOPY SURFACE IONIZATION PKA
英文摘要	Chemical force microscopy (CFM) was used to follow the dissociation process of 4-mercaptopyridine (4-MP) self-assembled monolayers (SAMs) on gold. The force probe was an Au-coated Si(3)N(4) tip modified with 4-MP SAM. The adhesion force between tip and substrate was found to be a function of solution pH. The PK(1/2) value of surface pyridyl groups of 4-MP SAM obtained from force titration curve was 5.4, remarkably different from the conventional contact angle titration result (pK(1/2)=3.3). This difference is believed to arise from the difference in spatial resolution of two approaches. The force titration would probe the local dissociation properties of surface groups, while the contact angle titration reflects the average dissociation properties underneath the water droplet.; Crystallography; SCI(E); CPCI-S(ISTP); 6
语种	英语
DOI标识	10.1080/10587259908023437
内容类型	其他
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/150550]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	He, HX,Zhang, H,Wang, YC,et al. Chemical force titration of conjugated pyridyl group-terminated self-assembled monolayers. 1999-01-01.

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