Adsorption of Proteins at the Solution/Air Interface Influenced by Added Nonionic Surfactants at Very Low Concentrations for Both Components. 2. Effect of Different Surfactants and Theoretical Model

Langmuir ◽  
2014 ◽  
Vol 30 (43) ◽  
pp. 12812-12818 ◽  
Author(s):  
V. B. Fainerman ◽  
M. Lotfi ◽  
A. Javadi ◽  
E. V. Aksenenko ◽  
Yu. I. Tarasevich ◽  
...  
Keyword(s):  
Theoretical Model ◽  
Nonionic Surfactants ◽  
Air Interface ◽  
Low Concentrations

Study on Wettability Alteration of Quartz Surface by Surfactants

2014 ◽  
Vol 962-965 ◽  
pp. 539-543
Author(s):  
Zi Yuan Qi ◽  
Ye Fei Wang ◽  
Hai Yang Yu ◽  
Xiao Li Xu
Keyword(s):  
Nonionic Surfactants ◽  
Anionic Surfactants ◽  
Electrostatic Force ◽  
Dynamic Contact ◽  
Contact Angles ◽  
Wettability Alteration ◽  
Quartz Surface ◽  
Hydrophobic Force ◽  
Polar Components ◽  
Low Concentrations

In order to study the effect of surfactants on wettability of quartz surface, the dynamic contact angles of different surfactants on water-wet and oil-wet quartz surfaces were measured. The experimental results showed that the advancing contact angles of cationic surfactants, anionic surfactants and nonionic surfactants on oil-wet quartz surfaces decrease with the increase of surfactant concentrations; the wettability of water-wet quartz plates remains water-wet after treated by all three kinds of surfactants. Surfactants can reverse the wettability from oil-wet to water-wet at low concentrations; The electrostatic force, hydrophobic force and the attraction between surfactant and polar components of crude oil are the key interactions in the wettability alteration process.

Simulation Study of the Ultrasonic Attenuation Measurement of Particle Concentration

2013 ◽  
Vol 291-294 ◽  
pp. 2723-2726
Author(s):  
Bao Jiang Sun ◽  
Ji Guang Chen
Keyword(s):  
Theoretical Model ◽  
Particle Concentration ◽  
Ultrasonic Attenuation ◽  
Paper Analysis ◽  
Physical Parameters ◽  
Scattering Method ◽  
Simulation Experiments ◽  
Attenuation Measurement ◽  
Low Concentrations ◽  
Methods Of Measurement

This paper analysis principle of BLBL(Bouguer-Laanbert-Beer-Law) model, and introduce SiO2 physical parameters of the simulation experiments to verify the scope of the model and the expected value of the theoretical model. The model be applicable under the low concentrations and meets unrelated conditions. The model full-scattering method in the optics methods of measurement obtained consistent with the theoretical value.

scholarly journals A Multistate Adsorption Model for the Adsorption of C14EO4 and C14EO8 at the Solution/Air Interface

2021 ◽  
Vol 5 (3) ◽  
pp. 39
Author(s):  
Valentin B. Fainerman ◽  
Volodymyr I. Kovalchuk ◽  
Eugene V. Aksenenko ◽  
Francesca Ravera ◽  
Libero Liggieri ◽  
...  
Keyword(s):  
Experimental Data ◽  
Theoretical Model ◽  
Profile Analysis ◽  
Alkyl Ether ◽  
Adsorption Model ◽  
Data Description ◽  
Classical Version ◽  
Air Interface ◽  
Complete Set ◽  
Adsorption Layers

The dynamic and equilibrium properties of adsorption layers of poly (oxyethylene) alkyl ether (CnEOm) can be well described by the reorientation model. In its classical version, it assumes two adsorption states; however, there are obviously surfactants that can adsorb in more than two possible conformations. The experimental data for C14EO4 and C14EO8 (dynamic and equilibrium surface tensions and surface dilational visco-elasticity as measured by bubble profile analysis tensiometry) are used to verify if a reorientation model with more than two possible adsorption states can better describe the complete set data of CnEOm adsorption layers at the water/air interface. The proposed refined theoretical model allows s different states of the adsorbing molecules at the interface. The comparison between the model and experiment demonstrates that, for C14EO4, the assumption of s = 5 adsorption states provides a much better agreement than for s = 2, while for C14EO8, a number of s = 10 adsorption states allows an optimum data description.

scholarly journals Irreversible chemical afm-fishing for the detection of low-copied proteins

2014 ◽  
Vol 60 (1) ◽  
pp. 28-50 ◽  
Author(s):  
Yu.D. Ivanov ◽  
V.V. Danichev ◽  
T.O. Pleshakova ◽  
I.D. Shumov ◽  
V.S. Ziborov ◽  
...  
Keyword(s):  
Experimental Data ◽  
Atomic Force Microscopy ◽  
Theoretical Model ◽  
Horseradish Peroxidase ◽  
Bulk Solution ◽  
Irreversible Binding ◽  
Chip Surface ◽  
Force Microscopy ◽  
Atomic Force ◽  
Low Concentrations

The atomic-force microscopy-based method of irreversible chemical AFM-fishing (AFM-IF ) has been developed for the detection of proteins at ultra-low concentrations in solution. Using this method, a very low concentration of horseradish peroxidase (HRP) protein (10 17 M) was detected in solution. A theoretical model that allows the description of obtained experimental data, is proposed. This model takes into consideration both the transport of the protein from the bulk solution onto the AFM-chip surface and its irreversible binding to the activated area.

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