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1

C12 hydroxyester ethoxylates as nonionic surfactants

100%

Materna K., Tic W., Sokołowski A., Hreczuch W.

Open Chemistry

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2011

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vol. 9

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issue 2

300-307

EN

A series of ethoxylates of 2,2,4-trimethyl-1,3-pentanediol mono-isobutyrate representing a synthetic C12 hydroxyester hydrophobe was obtained. The solubility parameters, surface tension and critical micelle concentrations for model solutions were investigated. The new surfactants were found to produce extremely low foam levels and a non-standard surface interfacial behavior was determined. It was observed that the ethoxylates of the C12 hydroxyester formed an oriented monolayer at the interface regardless of their average polyaddition degree. Such behavior is different from the surface activities of commonly known linear nonionic surfactants and it indicates self organization of the surfactants at the interface. This feature offers possibility for application of these surfactants in nanotechnology as well as in the conventional cleaning processes.

2

Excess interfacial energy change of solid/aqueous salt solution system with increasing salt concentration at a constant charge-determining ion activity based on the Gibbs equation and ionic components of charge

88%

Ratajczak T., Drzymala J.

Open Chemistry

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2012

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vol. 10

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issue 6

1927-1932

EN

A thermodynamic equation relating the change of interfacial excess (Gibbs) energy in the solid/aqueous salt solution system, caused by a variation of concentration of inorganic salt at a constant charge-determining ion activity, temperature and pressure, is derived. The equation is based on the Gibbs equation and ionic components of charge parameters. On the basis of literature experimental data for the AgI/aqueous KNO3 and TiO2/aqueous NaCl systems it was shown that the interfacial excess energy decreases with increasing salt concentration due to variation of the ionic components of charge of the interface. [...]

3

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

88%

Adewuyi A., Göpfert A., Wolff T.

Open Chemistry

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2013

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vol. 11

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issue 8

1368-1380

EN

The 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). [...]

4

Surface tension study of cationic gemini surfactants binding to DNA

88%

Pisárčik M., Devínsky F.

Open Chemistry

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2014

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vol. 12

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issue 5

577-585

EN

Binding of cationic gemini surfactants alkanediyl-a-ω-bis(dimethyldodecylammonium bromides) with variable polymethylene spacer length ranging from 2 to 12 methylene groups to DNA in NaBr solution is investigated utilizing the tensiometry method. A simple method is presented for calculating the number of surfactant molecules bound to DNA. The results are evaluated in terms of the gemini surfactant spacer length, showing that gemini molecules with either short spacers (2 methylene groups) or long spacers are most efficiently adsorbed to DNA. A weak adsorption to DNA was found for gemini molecules with a medium spacer length (6 methylene groups in the spacer). The binding properties of cationic gemini surfactants as a function of spacer length are consistent with the results obtained by other experimental methods (dynamic light scattering measurements, fluorescence spectroscopy), indicating identical adsorption behaviour of gemini molecules as a function of the spacer length.

5

Semi-Automatic Apparatus for Measuring Wetting Properties at High Temperatures

88%

Bąkała M., Wojciechowski R., Sankowski D., Rylski A.

Metrology and Measurement Systems

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2017

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vol. 24

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issue 1

6

Calculation of Surface Tension of Multicomponent Silicate Solutions

88%

Kalisz D., Kalisz D.

Archives of Foundry Engineering

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2020

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vol. 20

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issue 4

7

Fuzzy modeling applied to optical and surface properties of a ferrocenylsiloxane polyamide solution

88%

Pislaru M., Curteanu S., Cazacu M.

Open Chemistry

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2012

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vol. 10

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issue 1

194-204

EN

A fuzzy model was designed to predict changes in surface tension and maximum absorbance due to self-assembly in a DMF solution of poly{1,1′-ferrocene-diamide-[1,3-bis(propylene) tetramethyl-disiloxane} as a function of temperature and concentration. The building of fuzzy rule-based inference systems appears as a grey-box because it allows interpretation of the knowledge contained in the model as well as its improvement with a-priori knowledge. The method provides accurate results and increases the efficiency of utilizing the available information in the model. Small mean squared errors (0.0064 for absorbance and 0.79 for surface tension) and strong correlations between experiment and simulated results (0.93 and 0.97, respectively) were found during model validation. The results showed that it is feasible to apply a Mamdani fuzzy inference system to the estimation of optical and surface properties of a ferrocenylsiloxane polyamide solution.

8

Wettability and Surface Free Energy of Ti(C,N) Coatings on Nickel-based Casting Prosthetic Alloys

75%

Banaszek K., Klimek L.

Archives of Foundry Engineering

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2015

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issue 3

Refine search results

C12 hydroxyester ethoxylates as nonionic surfactants

Excess interfacial energy change of solid/aqueous salt solution system with increasing salt concentration at a constant charge-determining ion activity based on the Gibbs equation and ionic components of charge

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

Surface tension study of cationic gemini surfactants binding to DNA

Semi-Automatic Apparatus for Measuring Wetting Properties at High Temperatures

Calculation of Surface Tension of Multicomponent Silicate Solutions

Fuzzy modeling applied to optical and surface properties of a ferrocenylsiloxane polyamide solution

Wettability and Surface Free Energy of Ti(C,N) Coatings on Nickel-based Casting Prosthetic Alloys