Preparation of nanocomposites based on starch and Na-montmorillonite in a rotary-pulsating device

The possibility of using complex mechanical actions implemented in a rotary-pulsating device for obtaining nanocomposites based on starch or cationic starch and Na-montmorillonite was studied. Structures and physical-mechanical properties of films formed from liquid-phase nanocomposite systems were investigated.     

Mechanical activation of a gelatinized dispersion of carboxymethylated starch in a conical rotor apparatus

Effect of the shear deformation rate in a conical rotor apparatus on the structure of gelatinized dispersions of carboxymethylated starch was studied.     

Rheological properties of colloid solutions of starch, produced by the mechanothermal method

Rheological method was used to study structural-mechanical properties of a solution of starch gelatinized in a two-stage rotary-pulsatory apparatus with a combined operation principle.     

Aqueous polyaniline dispersions stabilized by polymeric carboxyl-containing surfactants

Aqueous dispersions of polyaniline were synthesized in the presence of various surfactants. Polyvinyl alcohol and polymeric surfactants with various chain lengths of polyoxyethylene fragments served as stabilizers. It was shown that it is advisable to use polymeric surfactants with side polyoxyethylene fragments to improve the sedimentation stability of aqueous dispersions of polyaniline. It was found that the particle size distribution of aqueous dispersions depends on the composition of the stabilizer used. Raising the pH value of aqueous dispersions to 8 makes it possible to substantially raise the sedimentation stability. The effect of a surfactant used to stabilize the dispersed system on the electrokinetic potential was examined.     

Characteristics of the particle size distribution of hydrolyzed starch, as determined by dynamic light scattering

The unimodal distribution of hydrodynamic radii is determined by DLS measurements of starch molecule sizes. The starch was hydrolyzed in 0.3 M hydrochloric acid for 3–9 h. The ratio of amylose to amylopectin is shown to remain constant.     

Evolution of rheological properties of starch solutions obtained by mechanothermal and thermal methods

Regularities of the time variation of viscosity of colloidal starch solutions obtained by combined mechanical and thermal actions on biopolymer dispersions were studied.     

Effect of alkylamino group fixation on the spectral-luminescence properties of coumarines and their ability to participate in intermolecular interactions

The spectral-luminescence properties of substituted 7-alkylaminocoumarines with nonfixed and fixed amino groups and AC3F are studied theoretically and experimentally. The calculation is carried out by the method of partial neglect of differential overlapping. It is shown that fixation of alkylamino groups in coumarines increases the quantum yield of fluorescence in polar solutions with virtually no effect on the position of the absorption and fluorescence spectra. Data from molecular electrostatic potential calculations show that the coumarines with a fixed aikylamino group have a high probability for participating in intermolecular interactions in the proton acceptor centers.The material in this paper was presented at the All-Union Conference on Organic Luminophores and Their Application in the Economy, Khar'kov (1984).Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 11, pp. 79–84, November, 1986.     

Effect of peat humus acids on the structure of sizing starch gels

Influence of peat humus acid microadditions on the structure of starch gels for sizing cotton yarn is studied by rheology.     

Methods for simulating the readout of lengths and angles in laser interferometers with Gaussian beams

In this paper methods to simulate the signals in laser interferometers are proposed. The central part deals with the computation of the photocurrent, subsequent phase demodulation and finally the generation of interferometer signals, such as the longitudinal phase readout, differential wavefront sensing signal, differential power sensing and contrast. Here, fundamental Gaussian beams without astigmatism are assumed. The methods are validated in several examples by comparison with experimental data, with analytical results as well as with an intuitively predictable system.