Probing the Gelatin–Alkylammonium Salt Mixed Assemblies through Surface Tensiometry and Fluorimetry

2018 ◽  
Vol 122 (20) ◽  
pp. 5161-5172 ◽  
Author(s):  
Suprava Maharana ◽  
Pramila K. Misra
Keyword(s):  
Alkylammonium Salt ◽  
Surface Tensiometry

Application of surface tensiometry in the investigation of the permeation process using Rossi number

2021 ◽  
Author(s):  
Davide Rossi ◽  
Marisa Fiordelisi ◽  
Elisa Vettorato ◽  
Nicola Realdon
Keyword(s):  
Surface Tensiometry

Complexation of β-Cyclodextrin with a Gemini Surfactant Studied by Isothermal Titration Microcalorimetry and Surface Tensiometry

Langmuir ◽  
2014 ◽  
Vol 30 (23) ◽  
pp. 6756-6762 ◽  
Author(s):  
Mária Benkő ◽  
László A. Király ◽  
Sándor Puskás ◽  
Zoltán Király
Keyword(s):  
Gemini Surfactant ◽  
Isothermal Titration Microcalorimetry ◽  
Titration Microcalorimetry ◽  
Surface Tensiometry

scholarly journals Morphology of Dried Drop Patterns of Saliva from a Healthy Individual Depending on the Dynamics of Its Surface Tension

Surfaces ◽  
2019 ◽  
Vol 2 (2) ◽  
pp. 395-414 ◽  
Author(s):  
Lyudmila V. Bel’skaya ◽  
Elena A. Sarf ◽  
Anna P. Solonenko
Keyword(s):  
Surface Tension ◽  
Biological Fluids ◽  
Human Saliva ◽  
Diagnostic Methods ◽  
Visual Methods ◽  
Dynamic Surface ◽  
Integral Methods ◽  
Crystallization Zone ◽  
And Gender ◽  
Surface Tensiometry

Background: The study of processes in the drying drops of biological fluids (dried drop patterns) and the method of dynamic surface tensiometry can be attributed to integral methods of assessing the state of the organism. Research objective: to establish the relationship between the type of crystallization patterns and the surface tension of human saliva in normal conditions. Methods: 100 volunteers (40 males, 60 females) that were aged 30–59 participated in the study. In all saliva samples, the parameters of dynamic tensiometry, types of crystallization patterns and 11 biochemical parameters were determined. Results: No statistically significant differences in the saliva crystallization patterns were observed, depending on the age and gender characteristics of the volunteers. A negative correlation of the area of the crystallization zone and the surface tension of saliva is shown. When considering the crystallization patterns, their considerable variability was noted; on this basis, the entire studied sample was divided into four clusters by surface tension. Conclusion: In general, the crystallization patterns that are inside the selected groups remain quite heterogeneous. This increases the likelihood of making an incorrect diagnosis when using visual methods to evaluate the crystallization patterns, which significantly limits the use of such diagnostic methods in clinical practice.

scholarly journals PHYSICAL CHEMICAL STUDIES OF THE AGGREGATION AND CATALYTIC PROPERTIES OF THE SURFACTANT CETYLDIMETHYLETHYLAMMONIUM BROMIDE (CDEAB)

1999 ◽  
Vol 7 (8) ◽  
pp. 105-114
Author(s):  
Lavinel G. Ionescu ◽  
Silvia Dani ◽  
Elizabeth Fatima de Souza
Keyword(s):  
Free Energy ◽  
Catalytic Properties ◽  
Activation Parameters ◽  
Critical Micellar Concentration ◽  
Physical Chemical ◽  
Chemical Studies ◽  
Diphenyl Phosphate ◽  
Free Energy Of Micellization ◽  
Surface Tensiometry ◽  
Hydrolysis Of

The micellization of cetyldimethylethylammonium bromide (CDEAB) in water was studied by means of surface tensiometry. The critical micellar concentration (CMC) was determined at 25°, 32°, and 40°C, and thermodynamic properties such as the free energy of micellization (∆G°mic), enthalpy (∆H°mic) and entropy (∆S°mic) of micellization were measured. The CMC at 25°C was 9.05 x 10-4 M and the corresponding values of the thermodynamic parameters were: ∆G°mic = -4.15 kcal/mol; ∆H°mic = -1.37 kcal/mol and ∆S°mic = + 9.33 e.u. Micelles of the surfactant CDEAB were good catalysts for the alkaline hydrolysis of p-nitrophenyl diphenyl phosphate (NPDPP) with a maximum catalytic factor of approximately 80, comparable to that of CTAB. Typical activation parameters measured for 0.005 M NaOH were: Ea = 9.0 kcal/mol; ∆H°≠ = 8.4 kcal/mol; ∆G°≠ = 19.2 kcal/mol and ∆S°≠ = -36.3 e.u. The kinetic results were also analyzed in terms of the pseudo-phase ion-exchange models (PPIE) and showed that the model is applicable and gave reasonable fits

A supramolecular polymer gel with dual-responsiveness constructed by crown ether based molecular recognition

2014 ◽  
Vol 5 (19) ◽  
pp. 5591-5597 ◽  
Author(s):  
Danyu Xia ◽  
Min Xue
Keyword(s):  
Molecular Recognition ◽  
Crown Ether ◽  
Self Assembly ◽  
Supramolecular Polymer ◽  
Polymer Gel ◽  
Alkylammonium Salt

A supramolecular polymer gel was prepared from self-assembly of a heteroditopic A–B monomer based on benzo[18]crown-6. Such a gel shows interesting gel–sol transitions in response to dual-stimuli owing to the dynamically reversible complexation between benzo[18]crown-6 and primary alkylammonium salt moieties.

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