Mechanical properties of fatty acid monolayers on the water surface based on surface pressure relaxation and area creep measurements (abstract)

1992 ◽  
Vol 36 (5) ◽  
pp. 974-974
Author(s):  
Tatsuya Tanizaki ◽  
Atsushi Takahara ◽  
Tisato Kajiyama
Keyword(s):  
Mechanical Properties ◽  
Fatty Acid ◽  
Surface Pressure ◽  
Water Surface ◽  
Pressure Relaxation ◽  
Creep Measurements

scholarly journals Mechanical properties of polymer-talc binary composite systems: effects of fatty acid amides.

1993 ◽  
Vol 66 (10) ◽  
pp. 724-730
Author(s):  
Osamu SHIMOMURA ◽  
Yoshio TAKAI ◽  
Masami SAWADA ◽  
Shigetoshi TAKAHASHI ◽  
Kunio GOTO
Keyword(s):  
Mechanical Properties ◽  
Fatty Acid ◽  
Fatty Acid Amides ◽  
Composite Systems ◽  
Binary Composite

Evaluation of Melting and Crystalline Relaxation Temperatures of Fatty Acid Monolayers on the Water Surface and Their Importances for Molecular Aggregation States in Monolayers

1992 ◽  
Vol 65 (3) ◽  
pp. 864-870 ◽  
Author(s):  
Tisato Kajiyama ◽  
Yushi Oishi ◽  
Motoko Uchida ◽  
Naoaki Morotomi ◽  
Jun-ichi Ishikawa ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Water Surface ◽  
Molecular Aggregation

scholarly journals Snowpack-stored atmospheric surface-active contaminants traced with snowmelt water surface film rheology

2020 ◽  
Author(s):  
Stanisław J. Pogorzelski ◽  
Paweł Rochowski ◽  
Maciej Grzegorczyk ◽  
Katarzyna Boniewicz-Szmyt
Keyword(s):  
Surface Pressure ◽  
Water Surface ◽  
Temporal Evolution ◽  
Surface Film ◽  
Virial Equation ◽  
Rheological Parameters ◽  
Film Material ◽  
Structure Characteristics ◽  
Film Forming ◽  
Surface Active

Abstract The aim of the study was to quantify the adsorptive and thermo-elastic properties of snowmelt water surface films and their spatial-temporal evolution with snowpack structure characteristics and the entrapped surface-active organic composition. Surface pressure–area (π-A)T isotherms, surface pressure-temperature (π-T)A isochors, and stress–relaxation (π-t) measurements were performed using a Langmuir trough system on snowmelt water samples collected in a large-scale field studies performed at several industrialized and rural Tricity (Gdansk, Poland) areas at various environmental conditions and subsequent stages of the snowpack melting progress. Since the snow-melted water composition and concentrations of surface active organic matter fractions therein are largely undetermined, the force-area isotherm scaling formalisms (2D virial equation and 2D film scaling theory of polymeric films) were adapted to the complex mixture of surfactants. The surface film parameters and their spatial and temporal evolution turned out to be unequivocally related to principal signatures of the film-forming materials: surfactant concentrations (π, Alim), surface activity (Eisoth, |E|), film material solubility (R), surface material miscibility and 2D architecture complexity (y, βs), molecular thermal mobility (πk), and a timescale of the relaxation processes within the film (τi, |E|). Moreover, the parameters appeared to be correlated with snowpack structure characteristics (snow density ρ, specific snow area SSA, snow cover thickness), sample age time, and anthropogenic atmospheric contamination pressure source locations. In particular, Eisoth was found to be related to ρ and SSA, while R correlated with the solubility of film-forming organics which turned out to be long-chain fatty acids; similarly, spatial profiles of Eisoth revealed the peak values next to the areas being under a severe anthropogenic air pollution pressure. Snowmelt water films stand for a structurally heterogeneous (y > 10) interfacial system where several transition processes of differentiated time-scales (relaxation times from 7 to 63 s) took place leading to the apparent surface viscoelasticity. To sum up, the established surface rheological parameters could serve as novel indicators, based solely on physical attributes, allowing to follow the snowpack evolution, and its melting polymorphism in order to test or improve the existing snow-entrapped organics release models based on chemical analyses. The cross-correlation functional dependences of practical value remain to be established on the larger data set.

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