Application of the Frumkin equation to electrocapillary and capacity data of some aliphatic compounds. [N-pentanoic acid, isopentyl alcohol, primary butyl alcohol]

Journal Article · Thu Feb 12 04:00:00 EST 1976 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100545a007· OSTI ID:7353046

Broadhead, D E; Balkerikar, K G; Hansen, R S

High precision electrocapillary and capacity data for n-pentanoic acid, isopentyl alcohol, and primary butyl alcohol are tested against the Frumkin equation with parameters selected to minimize root-mean-square deviations from experimental data. For electrocapillary curves with maximum adsorbate coverages less than 0.9, excellent fits were obtained (average rms deviation for the three solutes 0.2 dyne/cm). Capacity-polarization curves are much more highly structured and therefore more severely test adsorption theories; deviations between experiment and theory were plainly evident in all systems and the average rms deviation for the three solutes was 1.5 ..mu..F/cm/sup 2/. Parameters chosen to best fit electrocapillary curves were in fair agreement with those chosen to best fit capacity curves but interchange of parameter sets led to noticeably poorer fits (average rms deviations about 0.6 dyne/cm and 2 ..mu..F/cm/sup 2/, respectively). Substantially poorer fits resulted if data corresponding to maximum coverages in excess of 0.9 were included. (auth)

• Research Organization: Ames Lab., IA
• OSTI ID: 7353046
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 80:4; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400* -- Electrochemistry
ADSORPTION
ALCOHOLS
BUTANOLS
CARBOXYLIC ACIDS
CHEMISTRY
ELECTRIC MEASURING INSTRUMENTS
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
ELECTROCHEMISTRY
ELECTROMETERS
EQUATIONS
EQUIPMENT
HYDROXY COMPOUNDS
MEASURING INSTRUMENTS
MONOCARBOXYLIC ACIDS
NUMERICAL SOLUTION
ORGANIC ACIDS
ORGANIC COMPOUNDS
PENTANOLS
PHYSICAL PROPERTIES
POLARIZATION
SORPTION
SURFACE PROPERTIES
SURFACE TENSION
VALERIC ACID