Physical Properties of Self-Assembled Monolayers of Mercapto Oligo (ethylene oxide) Methyl Ether on Gold

Yoshimoto, Minoru; Honda, Keita; Aizawa, Hitoshi; Kurosawa, Shigeru; Tanaka, Mutsuo

doi:10.5650/jos.62.45

Cited by 2 publications

(4 citation statements)

References 29 publications

(31 reference statements)

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“…The CV charts for electrochemical reductive desorption of (EO) n are shown in Figure S3 of the Supporting Information. The values of ρ eff and h eff of the SAM can be yielded by combining the CV and impedance data as ρ eff = ρ normalW m QCM − m CV m QCM + ρ normals m CV m QCM h eff = m QCM ρ eff where m CV is the mass per unit area measured by the CV, ρ W is the water density of 997 kg/m 3 , and ρ s is the density of SAM estimated as 1200 kg/m. ,,, …”

Section: Results and Dicussionmentioning

confidence: 99%

“…where m CV is the mass per unit area measured by the CV, ρ W is the water density of 997 kg/m 3 , and ρ s is the density of SAM estimated as 1200 kg/m. 27, 28,37,38 Using the data of harmonic overtones of a fundamental resonant frequency, the parameter values of eqs 1 and 2 were evaluated using the genetic algorithm in MATLAB. Figure 1 shows the results for m QCM and m CV as a function of the molecular weight of (EO) n .…”

Section: ■ Results and Dicussionmentioning

confidence: 99%

“…Here, we attempted to evaluate the h eff values for the SAMs of (EO) 35 and (EO) 43 from the tendency of the relative water content in SAM, w % , in relation to the molecular weight of (EO) n , M n . The w % value was calculated by 37,38 On the basis of eq 6, we calculated the w % values. Figure 2 indicates that the w % values increase with M n , and have the constant value of 20% above (EO) 19 .…”

Section: ■ Results and Dicussionmentioning

confidence: 99%

Section: Results and Dicussionmentioning

confidence: 99%

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Dynamic Properties of Self-Assembled Monolayers of Mercapto Oligo(ethylene oxide) Methyl Ether on an Oscillating Solid–Liquid Interface

et al. 2014

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The dynamic properties of chemisorbed soft matter on a solid−liquid interface oscillating at megahertz were investigated using a quartz crystal microbalance (QCM). As a chemisorbed soft matter, we employed the self-assembled monolayers of mercapto oligo(ethylene oxide) methyl ethers, HS(CH 2 CH 2 O) n CH 3 (n = 5, 11, 12, 19, 27, 35, and 43), where those molecular weights had unity. The systematic analyses on the basis of the Voight model revealed that the molecular thickness moving with the solid−liquid interface oscillating at megahertz frequencies, the resonant length, is 8.8 nm, where the frequency dependence of the resonant length is not considered. On the other hand, the analyses based on the Debye process revealed that the logarithm of the resonant length linearly decreases with the logarithm of 2πF, where F is the frequency of the QCM, and varies from 17.3 (9 MHz) to 12.4 nm (81 MHz). Those values in the Debye process were within twice that of the Voight model and were approximately consistent with that in the Voight model. On the basis of the experimental data, we proposed the equation with the resonant length of HS(CH 2 CH 2 O) n CH 3 as a function of frequency. Moreover, we discussed the difference between the chemisorbed and the physisorbed molecules on the solid−liquid interface oscillating at megahertz frequencies.

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