Diffusion of self-assembled monolayers of thiols on the gold surfaces covered with polydimethylsiloxane stamps

Abstract

Thiols can diffuse and form self-assembled monolayers (SAMs) on the gold surfaces covered with polydimethylsiloxane (PDMS) stamps. For the first time, with cells as the indicator of how far alkanethiols had diffused to form SAM, we studied the growth dynamics of SAMs of HS(CH 2 ) 11 (OCH 2 CH 2 ) 3 OH (EG 3 ) and HS(CH 2 ) 11 (OCH 2 CH 2 ) 6 OH (EG 6 ) on the gold surfaces covered with PDMS stamps. The growth of SAMs is well described by one-dimensional diffusion from a line source of concentration, with surface diffusion coefficient of 193.4 ± 19.2 lm 2 /min (EG 3 ) and 95.8 ± 18.9 lm 2 /min (EG 6 ).

Effect of Concentration, Chain Length, Hydrophobicity, and an External Electric Field on the Growth of Mixed Alkanethiol Self-Assembled Monolayers: A Molecular Dynamics Study

“…The first-order diffusion-limited Langmuir model (see eq ) achieved the best fit to the simulation data (see Figure S3, Supporting Information). This indicates that internal diffusion of the alkanethiolates is the rate-limiting step for SAM growth in the initial stage, which is in agreement with other studies. ,, The first-order diffusion-limited Langmuir model is as follows where θ is the fraction of monolayer surface coverage (0 ≤ θ ≤ 1) and k 1DL (in ns –0.5 ) is the rate constant. ,, The first-order kinetic model fitting curves for all of the alkanethiolate concentrations are shown in Figures S4 and S5, Supporting Information. The rate constants obtained from the fitting quantified the initial growth of the different SAM systems.…”

“…This indicates that internal diffusion of the alkanethiolates is the rate-limiting step for SAM growth in the initial stage, which is in agreement with other studies. 68,71,72 The first-order diffusion-limited Langmuir model is as follows…”

Gallium‐Induced Perturbation of Zinc Selenide Quantum Dots Electronics

“…The surface concentrations calculated from equation 9b, were 6.1426 x 10 ‐10 mol cm ‐2 for Ga 2 Se 3 ‐3MPA, 2.5215 x 10 ‐10 mol cm ‐2 for ZnSe‐3MPA and 1.3778 x 10 ‐10 mol cm ‐2 for Ga‐doped ZnSe‐3MPA. These surface concentration values lie within the order for a monolayer and the characterized MPA induced self‐assembled monolayer of the quantum dots.…”

Application of LC-MS-Based Global Metabolomic Profiling Methods to Human Mental Fatigue

“…Analytical methods have been developing rapidly with the development of nanoscience, computer science, and mass spectrometric technology since the end of the last century, − and these developments have made it possible to learn biochemical changes in organisms at great depth even at the cellular level. − We can even monitor changes and identify compounds in living organisms, , in particular, with the emergence of metabolomics. Metabolomics “measures the fingerprint of biochemical perturbations caused by disease, drugs, and toxins” in order to find related biomarkers. , These biomarkers help us to understand these biochemical perturbations better and contribute to diagnoses and therapy of disease, discovery of new drugs, and evaluation of toxins.…”