Order and composition of methyl-carboxyl and methyl-hydroxyl surface-chemical gradients

Langmuir : the ACS Journal of Surfaces and Colloids
Nagaiyanallur V VenkataramanNicholas D Spencer

Abstract

A detailed infrared and XPS characterization of surface-chemical gradients of dodecanethiol with 11-mercaptoundecanol or 11-mercaptoundecanoic acid self-assembled on gold, is reported. Gradients were prepared using a simple, two-step process previously reported from our laboratory, which involves a controlled immersion of a polycrystalline gold substrate in a dilute (5 microM) solution of one component and a subsequent back-filling with the other. FTIR measurements show that a single-component gradient of dodecanethiol is composed of disordered, liquidlike alkyl chain conformations. Such a gradient, when back-filled with a complementary thiol, having either a hydroxyl or carboxyl end-group, yields two-component gradients that show similar changes in wettability along their lengths. However, while gradients composed of methyl and hydroxyl end-groups show a well-ordered alkyl chain structure over their entire length, methyl-carboxyl gradients exhibit a greater conformational disordering toward the carboxyl-rich end.

References

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Jan 26, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Shuang LiScott S Perry
Jan 26, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Michael RieplBo Liedberg
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Mar 8, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·Sara M MorgenthalerNicholas D Spencer

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Citations

Jun 7, 2013·Interface Focus·Jindan WuChangyou Gao
Sep 16, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Giulia FioravantiMassimiliano Cavallini
Aug 16, 2008·Angewandte Chemie·Tobias WinklerAndreas Terfort
Aug 10, 2015·Journal of Chromatography. a·Veeren C DewoolkarMaryanne M Collinson
Nov 13, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Andrew C JamisonT Randall Lee
Feb 21, 2008·Soft Matter·Sara MorgenthalerNicholas D Spencer
Jan 29, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Jan Genzer, Rajendra R Bhat
Jun 16, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Doris M SporiStefan Zürcher
Feb 20, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Eva BeurerNicholas D Spencer
Aug 30, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Rosalynn Quiñones, Ellen S Gawalt
Sep 20, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·Jan GenzerDaniel A Fischer

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