An indirect laser-induced temperature jump determination of the surface pKa of 11-mercaptoundecanoic acid monolayers self-assembled on gold
Article Abstract:
The acidity (pKa) of monolayers made up of 11-mercaptoundecanoic acid self-assembled on vapor-deposited gold film electrodes in contact with either 0.10 or 1.0 M ionic strength NaClO4 electrolyte solutions have been measured through indirect laser-induced temperature jump method. The pKa is defined as the value of the pH of the solution in contact with the monolayer when half of the acid functional groups have been ionized. Results indicated that pKa has a value of 5.7 +/- 0.2 at O.10 M ionic strength and 4.4 +/- 0.2 at 1.0 M ionic strength.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1999
User Contributions:
Comment about this article or add new information about this topic:
Principle of unchanging total concentration and its implication for modeling unsupported transient voltammetry
Article Abstract:
The electrochemistry of solutions with little or no added supporting electrolyte has been studied. Attention was given to the oxidation or reduction of an anion or a cation to produce another ion of the same sign as the reactant. Theoretical calculations and analyses were simplified by using the principle that the total solute concentration remains the same when the diffusivities of the solute species do not deviate significantly from a common value.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1999
User Contributions:
Comment about this article or add new information about this topic:
Dimensional analysis of chronoamperometry: proof and verification of Cottrellian behavior of systems with composition-dependent diffusion coefficients
Article Abstract:
The simulations of various examples of semi-infinite linear diffusional and migrational systems with compositionally dependent diffusion coefficients are done. It is inferred that chronoamperometry of an initially homogeneous system with Dirichlet boundary conditions and semi-infinite linear diffusion will always show Cottrellian behavior and that the product [it.sub.1/2] is constant as a function of time till the system is initially homogeneous.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2007
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Grazing-incidence x-ray diffraction study of octadecanoic acid monolayers. Coherent vibrational quantum beats as a probe of Langmuir-Blodgett monolayers
- Abstracts: Interaction of carbon monoxide with anatase surfaces at high temperatures: optimization of a carbon monoxide sensor
- Abstracts: Structural and macroscopic characterization of a gel phase of densely packed monodisperse, unilamellar vesicles
- Abstracts: Thermodynamic description of the interactions between lipids in ternary Langmuir monolayers: The study of cholesterol distribution in membranes
- Abstracts: Comparison between calculated and experimental vibrational spectra of uridine and cytidine. Effects of OH radical addition on proton transfer in the guanine-cytosine base pair