Preparation, surface activity and colloidal properties of the ionic complex of chitosan with hexadecyl-oligo-oxyethylene hemisuccinate

Mono- and di- esters of adipinic acid with long chain ethoxylated aliphatic alcohols (mixture of C10 – C12 and C16 – C18 alkohols) were obtained by the reaction of Synthanol DS-10 and adipinic acid and its dichloroanhydride. If adipinic acid with p-toluenesulfonic acid as catalyst were used as acylating agent and the mole ratio of Synthanol DS-10 to adipinic acid is 1:1 the yield of monoacylated product was 76 %. (temperature 120-125 °C, 3 h). If the mole ratio of Synthanol DS-10 to adipinic acid is 2:1 the yield of diacylated product was 80 % (temperature 120-125 °C, 6 h). Using dichloroanhydride of adipinic acid as acylating agent gives the 90 % (temperature 90-100 °C, 7.5 h) yield of diacylated product. The structure of all compounds was established by IR and NMR spectroscopy. Surface tension dependence on concentration in aqueous and alkaline medium was investigated for the obtained compounds. It was determined that the colloidal properties of the synthesized products differ significantly from the original Synthanol DS-10. The minimal surface tension of synthesized compounds is 25-33 mN/m. The surface activity of monoester in 5 % sodium hydroxide is 5.74 N·m2·mol-1 (for Synthanol DS-10 3.06 N·m2·mol-1). But in water their surface activity is 4.00 and 4.17, respectively. Opacity temperature in different mediums was established for the new compounds. Cloud point at the concentration of 0.25 g/dm3 of diester of adipinic acid in water (>100 °C) is significantly higher than for Synthanol DS-10 (81 °C) and for monoester (46 °C). In 5 % solution of sodium hydroxide the cloud points of all these compounds are the same (difference is 2-3 °C). The new products are stable in water and alkaline medium, but not stable in 0.1N solution of hydrochloric acid. The new synthesized surfactants from Synthanol DS-10 and adipinic acid (by the complex of colloidal and physical-chemical properties) are interesting as the ingredients of technical and household compositions. Forcitation:Lominoga E.A., Burmistrov K.S., Gevod V.S. Syntesis of dimeric surfactants based on synthanol DS-10 and adipinic acid. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N2. P. 91-96

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Surface activity and colloidal properties of drugs and naturally occurring substances

Surfactant Systems ◽

10.1007/978-94-009-5775-6_4 ◽

1983 ◽

pp. 124-228 ◽

Cited By ~ 5

Author(s):

D. Attwood ◽

A. T. Florence

Keyword(s):

Surface Activity ◽

Naturally Occurring ◽

Colloidal Properties

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Study of the surface properties of buckwheat flour produced by different enterprises by De-Nui methods and tenzimetric to predict its technological properties

Proceedings of the Voronezh State University of Engineering Technologies ◽

10.20914/2310-1202-2019-2-202-207 ◽

2019 ◽

Vol 81 (2) ◽

pp. 202-207

Author(s):

A. A. Livinskiy ◽

M. E. Saitova ◽

S. A. Livinskaya

Keyword(s):

Experimental Data ◽

Surface Properties ◽

Surface Activity ◽

Adsorption Properties ◽

Technological Properties ◽

Production Environment ◽

Industrial Community ◽

Colloidal Properties ◽

Air Liquid Interface ◽

Buckwheat Flour

The scientific and industrial community of specialists is developing indirect methods for predicting the technological properties of flour, which would reduce economic costs in a production environment. The results of comparing the colloidal properties of 4 samples of different producers of buckwheat flour from steamed cereals and 1 from green are presented. As methods for predicting the technological properties of flour used surface properties. The graphs of the dependence “surface tension at the air-liquid interface - concentration of dissolved substance” were constructed using experimental data obtained by the De Nui method. The surface activity of the compared samples was established by solving equations obtained by mathematical processing of experimental data. The adsorption properties of buckwheat flour samples were studied by the tensimetric method. Based on the study of surface properties, flour samples were arranged in a row according to the manifested colloidal properties. Studies of the surface properties of flour samples from steamed and non-steamed cereals showed that buckwheat flour produced by different enterprises is characterized by various adsorption properties, which should be taken into account during its storage and use in flour products. A sample of unpaired cereal has the highest surface activity, which allows us to recognize it as the best sample. The main influence on the technological advantages of flour is exerted by the fraction of flour with a particle size of up to 50 microns, the amount of which should be 58.69 ± 2%. At a higher content of particles of this fraction, the flour is characterized by reduced surface activity and has a higher hygroscopicity, which negatively affects its technological properties.

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Surface Activity of Newly Nonionic Surfactants at Air/Water Interface and their Interaction with Clay and Teflon

Tenside Surfactants Detergents ◽

10.3139/113.100371 ◽

2008 ◽

Vol 45 (3) ◽

pp. 137-143 ◽

Cited By ~ 2

Author(s):

R. Abdel-Rahem ◽

A. S. Ayesh

Keyword(s):

Surface Activity ◽

Nonionic Surfactants ◽

Water Interface ◽

Air Water Interface

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Influence of Partial Blocking of the Electrode Surface on the Transfer Coefficients

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19930496 ◽

1993 ◽

Vol 58 (3) ◽

pp. 496-505

Author(s):

Ondřej Wein

Keyword(s):

Surface Activity ◽

Elliptic Problem ◽

Electrode Surface ◽

Driving Force ◽

Two Dimensional ◽

Transfer Coefficients ◽

Constant Potential ◽

Numeric Solution ◽

Active Zones ◽

Partial Blocking

Partial blocking of the transport surface under the stagnant (nerst) layer is simulated by periodically alternating bands of perfectly insulating zones and active zones with a constant potential of driving force. The numeric solution of the corresponding two-dimensional elliptic problem is represented by a simple empirical correlation for the transfer coefficients. The result is interpreted in terms of a simple electrochemical problem about limiting diffusion currents at electrodes with non-uniform surface activity.

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