scholarly journals Preparation of foaming agents for dust suppression of coal particles

2019 ◽  
pp. 12-18
Author(s):  
Zh.B. Ospanova ◽  
S. Toktagul ◽  
A. Tasmagambetova ◽  
M. Asadov
Keyword(s):  
Surface Tension ◽  
Anionic Surfactants ◽  
Foam Stability ◽  
Sodium Dodecyl ◽  
Solid Particles ◽  
Foaming Agents ◽  
Coal Particles ◽  
Foaming Capacity ◽  
The Stability ◽  
Surface Tension Isotherms

The results of the study of foams stabilized by solid coal particles are given. The method of sedimentation analysis determined the most likely radius of coal particles equal to 20.28 microns. Foaming ability was determined by the height of the foam column obtained by the method of bubbling within 1 min. Foam stability was determined by the time of complete destruction of the foam column. Foams stabilized by the compositions of anionic surfactants – sodium dodecyl sulfate (DDSNa) and sulfonol (SF) with polyvinyl alcohol (PVA) in the presence of hydrophobic solid particles of coal showed greater foaming capacity and stability compared to foams from individual surfactants. The surface tension isotherms of aqueous solutions of surfactants, PVA, and their mixtures were obtained. An increase in the stability of foams in the presence of coal particles corresponds to a decrease in the surface tension at the liquid-gas interface. The stability of foams obtained from surfactant-PVA compositions is explained by the combined influence of thermodynamic (reduction of surface tension) and structural-mechanical (increase in viscosity of inter-membrane fluid) of stability factors. These properties of foams can be used to suppress dust in coal mining.

scholarly journals Foaming Capacity of New Superficial Active Salefied Polyether ( = 3 – 20) Primary Amides in Food Hygienization

2011 ◽  
Vol 68 (2) ◽  
Author(s):  
M. SBANCA ◽  
C. JIANU ◽  
I. JIANU
Keyword(s):  
Plant Protection ◽  
Foam Stability ◽  
Wide Spectrum ◽  
Foaming Agents ◽  
New Class ◽  
Wide Range ◽  
Low Toxicity ◽  
Foaming Capacity ◽  
Water Plants ◽  
Alkaline Catalysis

.Colloidal features [foaming capacity (FC); foam stability (FS) and foam density (FD)] of conditioning auxiliaries (additives) of plant protection active principles constitute, together with toxicity, a decisive technical index in forming administering receipts in modern ecological agriculture and foodstuff processing all during the agroalimentary processing and consumption chain. In this paper we show the results of a study on a new class of superficial active compounds salefied polyether ( = 3 – 20) primary amides. As diderived glymes, they have a guided regulation capacity of the HLB balance through the change of the medium degree of oligomerisation ( ) of the polyoxyethylene chain (PEO). Can thus obtain a wide range of structures such as micellar solute, dispersion, emulsion, and foaming agents, etc., through the cyanoethylation of polyethoxylated nonylphenols with a medium degree of oligomerisation ( ) between 3 and 20 structural oxyethylene units (EO) in alkaline catalysis with monomer acrylonitrile, followed by a classical hydrogenation in heterogeneous catalysis of intermediary nitrile thus obtained, and finally partial hysrolysis and salefied with HCOOH; CH3COOH. These are biodegradable in water plants, which ensure special ecologlcal features and high compatibility within the restrictive legal ensemble of a foodstuff processing integrated in an extremely polluted environment. Structures have real bacteriostatical abilities compared to a wide spectrum of microrganisms (tested in studies related to this paper). Low toxicity of polyoxyethylene chains (PEO) together with that of other structural units in this polyether primary amides provide the studied glymes with a high compatibility in relation to environment and to plant and animal organisms of the food chain.

scholarly journals Properties of sodium phosphate-hydroxy ethanolamide gemini surfactant synthesized from the seed oil of Luffa cylindrical

2013 ◽  
Vol 11 (8) ◽  
pp. 1368-1380 ◽  
Author(s):  
Adewale Adewuyi ◽  
Andrea Göpfert ◽  
Thomas Wolff
Keyword(s):  
Surface Tension ◽  
Reaction Mechanism ◽  
Sodium Dodecyl Sulphate ◽  
Sodium Phosphate ◽  
Gemini Surfactant ◽  
Seed Oil ◽  
Foam Stability ◽  
Sodium Dodecyl ◽  
Luffa Cylindrica ◽  
Wetting Power

AbstractThe production of surfactant from biological and renewable sources is important as this reduces environmental hazards since the products are highly biodegradable. Oil extracted from the seed of Luffa cylindrica using hexane in a soxhlet extractor was used in the synthesis of sodium phosphate-hydroxy ethanolamide via a simple reaction mechanism. The progress of the reaction was monitored and confirmed by FTIR, 1HNMR and 13CNMR. The process used gave a yield of 88.46% of sodium phosphate-hydroxy ethanolamide. The properties of this compound were compared with those of sodium dodecyl sulphate (SDS) used as a known reference surfactant. Important properties of sodium phosphate-hydroxy ethanolamide such as foam stability, wetting power and surface tension turned out superior to those of the known reference surfactant (SDS).

Surface properties of the bovine casein components: relationships between structure and foaming properties

1989 ◽  
Vol 56 (3) ◽  
pp. 495-502 ◽  
Author(s):  
Denis Lorient ◽  
Brigitte Closs ◽  
Jean Luc Courthaudon
Keyword(s):  
Surface Tension ◽  
Ionic Strength ◽  
Foam Stability ◽  
Covalent Binding ◽  
High Surface ◽  
Surface Hydrophobicity ◽  
Foaming Properties ◽  
Foam Formation ◽  
Foaming Capacity ◽  
Low Ionic Strength

SummaryIn order to optimize the use of caseins as surfactants, the surface tension, foaming capacity and stability were measured as a function of pH, ionic strength, protein concentration and polarity (modified by covalent binding of carbohydrates). We found that the caseins differ in their behaviour at the air/water interface with β-casein showing the greatest ability to decrease surface tension and to produce foams, due probably to its amphipathic structure. In experiments carried out at pH values close to pI, with low ionic strength and constant solubility (optimal conditions for foam formation), we observed a high surface hydrophobicity, a good accessibility and flexibility of peptidic side chains (evaluated by proteolysis), and a high foaming capacity parallelled by increased surface pressure. Foam stability of caseins was low compared to those of globular proteins such as β lactoglobulin.

Article

1998 ◽  
Vol 76 (2) ◽  
pp. 152-157
Author(s):  
Catherine E Drennan ◽  
Rachelle J Hughes ◽  
Vincent C Reinsborough ◽  
Oladega O Soriyan
Keyword(s):  
Surface Tension ◽  
Critical Micelle Concentration ◽  
Mixed Micelles ◽  
Anionic Surfactants ◽  
Sodium Dodecyl ◽  
Surfactant Solution ◽  
Kinetic Studies ◽  
Stopped Flow ◽  
Dilute Solution ◽  
Surfactant Micelles

Kinetic studies through stopped-flow spectroscopy were undertaken in the dilute solution range of anionic surfactants where pronounced rate enhancement or inhibition of Ni2+-ligand complexations is often observed at surfactant concentrations much below the critical micelle concentration (CMC). The results are interpreted in terms of Ni-surfactant micelles as the agents responsible for the rate changes in dilute surfactant solution. At higher surfactant concentrations these micelles are transformed into mixed micelles (counterion and size changes), eventually becoming normal surfactant micelles close to the CMC. Surface tension, dye solubility, conductivity, and fluorescent probe investigations support this interpretation.Key words: micellar catalysis, sodium dodecyl sulfate, micelles, critical micelle concentration, premicelles, Ni2+-ligand complexations.

scholarly journals A Review on Bubble Stability in Fresh Concrete: Mechanisms and Main Factors

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1820 ◽  
Author(s):  
Xiaohui Zeng ◽  
Xuli Lan ◽  
Huasheng Zhu ◽  
Haichuan Liu ◽  
Hussaini Abdullahi Umar ◽  
...  
Keyword(s):  
Surface Tension ◽  
Influencing Factors ◽  
Fresh Concrete ◽  
Foam Stability ◽  
Current Trend ◽  
Surface Elasticity ◽  
Air Bubbles ◽  
Huge Impact ◽  
The Stability ◽  
Air Liquid Interface

In order to improve the stability of air bubbles in fresh concrete, it is of great significance to have a better understanding of the mechanisms and main influencing factors of bubble stability. In the present review, the formation and collapse process of air bubbles in fresh concrete are essentially detailed; and the advances of major influencing factors of bubble stability are summarized. The results show that the surface tension of air–liquid interface exerts a huge impact on bubble stability by reducing surface free energy and Plateau drainage, as well as increasing the Gibbs surface elasticity. However, surface tension may not be the only determinant of bubble stability. Both the strength of bubble film and the diffusion rate of air through the membrane may also dominate bubble stability. The application of nano-silica is a current trend and plays a key role in ameliorating bubble stability. The foam stability could be increased by 6 times when the mass fraction of nano-particle reached 1.5%.

scholarly journals Laboratory Analysis of Foam Generating Surfactants and Their Thermal Stability for Enhanced Oil Recovery Application

2020 ◽  
Vol 39 (2) ◽  
Author(s):  
Muhammad Khan Memon ◽  
Ubedullah Ansari ◽  
Habib U Zaman Memon
Keyword(s):  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Foam Stability ◽  
Sodium Dodecyl ◽  
Life Time ◽  
Alpha Olefin Sulfonate ◽  
Alpha Olefin ◽  
Secondary Oil Recovery ◽  
The Stability ◽  
Brine Salinity

The residual oil after primary or secondary oil recovery can be recovered by the methods of EOR (Enhanced Oil Recovery). The objective of this study is screening the surfactants that generate maximum stable foam in the presence of brine salinity at 92oC. Laboratory experiments have been performed to examine and compare the stability of generated foam by individual and blended surfactants in the synthetic brine water. AOS C14-16 (Alpha Olefin Sulfonate) and SDS (Sodium Dodecyl Sulfonate) were selected as main surfactants. Aqueous stability test of AOS C14-16 and SDS with brine water salinity 62070ppm was performed at 92oC. AAS (Alcohol Alkoxy Sulfate) was blended with SDS and AOS C14-16. The solution was stable in the presence of brine salinity at same conditions. Salt tolerance experimental study revealed that AOS C14-16 did not produce precipitates at 92oC. Further, the foam stability of surfactant blend was performed. Result shows that, the maximum life time of generated foam was observed by using blend of 0.2wt% SDS+0.2wt% AOS+0.2wt% AS-1246 and 0.2wt% AOS+0.2wt% IOSC15-18+0.2wt% AAS surfactants as compared to the foam generated by individual surfactants. The success of generated foam by these surfactant solutions in the presence of brine water is the primary screening of surfactant stability and foamability for EOR applications in reservoirs type of reservoirs.

Application Property and Structural Characteristics of Bark Lignosulfonate Superplasticiser

2012 ◽  
Vol 460 ◽  
pp. 361-364
Author(s):  
Zhe Wang ◽  
Jing Wen Xue
Keyword(s):  
Molecular Weight ◽  
Surface Tension ◽  
Cement Paste ◽  
Foam Stability ◽  
Structural Characteristics ◽  
Hydroxyl Group ◽  
Carboxyl Group ◽  
Foaming Capacity ◽  
Application Property ◽  
Better Than

The application property and structural characteristics of bark lignosulfonate (LS) was studied. Results showed that bark LS had perfect application property in concrete. The fluidity of cement paste was 214mm, which was 87.0% of commercial superplasticiser of naphthalene sulfonate; the loss on fluidity of cement paste of bark LS was very small, which was much better than that of naphthalene sulfonate. The loss on fluidity of cement paste of bark LS after 60 min was only 5.6%, but that of naphthalene sulfonate was 30.6%. Bark LS had low foaming capacity and high foam stability. Surface tension of 1% bark LS solution was 48.1 mN/m. Structural characteristics of bark LS was also studied. It showed that the reason that bark LS had good application property was that it had high content of hydrophilic sulfonic group, carboxyl group and phenolic hydroxyl group, and uniform molecular weight distribution.

scholarly journals Characterization of lauryl betaine foam in the Hele-Shaw cell at high foam qualities (80%–98%)

2020 ◽  
Vol 17 (6) ◽  
pp. 1634-1654
Author(s):  
Asad Hassan Syed ◽  
Nurudeen Yekeen ◽  
Eswaran Padmanabhan ◽  
Ahmad Kamal Idris ◽  
Dzeti Farhah Mohshim
Keyword(s):  
Apparent Viscosity ◽  
Foam Stability ◽  
Sodium Dodecyl ◽  
Alpha Olefin Sulfonate ◽  
Stable Foam ◽  
Alpha Olefin ◽  
The Stability ◽  
Film Thinning ◽  
Hele Shaw Cell

AbstractLauryl betaine (LB) as an amphoteric surfactant carries both positive and negative charges and should be able to generate stable foam through electrostatic interaction with nanoparticles and co-surfactants. However, no previous attempts have been made to investigate the influence of nanoparticles and other co-surfactants on the stability and apparent viscosity of LB-stabilized foam. In this study, a thorough investigation on the influence of silicon dioxide (SiO2) nanoparticles, alpha olefin sulfonate (AOS) and sodium dodecyl sulfate (SDS), on foam stability and apparent viscosity was carried out. The experiments were conducted with the 2D Hele-Shaw cell at high foam qualities (80%–98%). Influence of AOS on the interaction between the LB foam and oil was also investigated. Results showed that the SiO2-LB foam apparent viscosity decreased with increasing surfactant concentration from 0.1 wt% to 0.3 wt%. 0.1 wt% SiO2 was the optimum concentration and increased the 0.1 wt% LB foam stability by 108.65% at 96% foam quality. In the presence of co-surfactants, the most stable foam, with the highest apparent viscosity, was generated by AOS/LB solution at a ratio of 9:1. The emulsified crude oil did not imbibe into AOS-LB foam lamellae. Instead, oil was redirected into the plateau borders where the accumulated oil drops delayed the rate of film thinning, bubble coalescence and coarsening.

Polidocanol foam stability in terms of its association with glycerin

2013 ◽  
Vol 29 (5) ◽  
pp. 304-309 ◽  
Author(s):  
R Rial ◽  
L S Hervas ◽  
G Monux ◽  
A Galindo ◽  
A Martin ◽  
...  
Keyword(s):  
Surface Tension ◽  
Foam Stability ◽  
Control Group ◽  
Foam Sclerotherapy ◽  
Time Control ◽  
Group 3 ◽  
Group 2 ◽  
The Stability ◽  
Microscopic Measurement ◽  
Group 1

Objectives: Foam sclerotherapy effectiveness mainly depends on the concentration of the sclerosing agent and foam stability. The objective of this study was to determine if the addition of glycerol at different concentrations contributes to the stability of polidocanol foam. Materials and methods: Control Group: 3% polidocanol. Group 1: polidocanol 3% + glycerin 1.66%. Group 2: polidocanol 3% + glycerin 3.3%. Group 3: polidocanol 3% + Glycerin 5%. Tessari standard method. Five recordings were made for each mixture. Early visual liquefaction time and half liquid time decay were recorded in seconds. Microscopic measurement of the foams. Mixtures surface tension measurement (N/m). Results: Early visual liquefaction: Control Group: 27 (± 3.11); Group 1: 67.8 (± 6.49); Group 2:48.6 (± 8.2); and Group 3: 35.8 (± 4.49). Half-liquid time: Control: 129.2 (± 11.00); Group 1: 260.4 (±18.99); Group 2: 224.6 (±13.03); and Group 3: 189.2 (±8.52). Bubbles/mm2–diameter–wall thickness: Control: 68–98 μm-7 μm; Group 1: 189–60 μm-9 μm; Group 2: 76–92 μm-12 μm; and Group 3: 49–112 μm-20 μm. Surface tension: Control = 5.54 N/m; Group 1 = 5.45 N/m; Group 2 = 5.35 N/m; and Group 3 = 5.21 N/m. Conclusions: Small amounts of glycerin highly increase the stability and quality of polidocanol foam. This simple chemical method is easily reproducible and applicable.

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