C 89 Critical properties of hydrogen peroxide determined from direct measurements [Text] / E. D. Nikitin, P. A. Pavlov, A. P. Popov, N. E. Nikitina // Journal of Chemical Thermodynamics. - 1995. - V. 27, №9. - P945-952 Рубрики: ФИЗИКА Кл.слова (ненормированные): СВОЙСТВА КРИТИЧЕСКИЕ -- КРИТИЧЕСКИЕ СВОЙСТВА -- ГИДРОГЕН ПЕРОКСИД -- ИЗМЕРЕНИЯ ПРЯМЫЕ -- ПРЯМЫЕ ИЗМЕРЕНИЯ -- ТЕПЛОФИЗИКА Аннотация: The critical temperatures and the critical pressures of aqueous solutions with mass fractions of hydrogen peroxide from 0 to 0.9 have been measured using the pulse-heating method applicable to thermally unstable substances. The critical temperature and the critical pressure of pure hydrogen peroxide have been determined by extrapolation. The results are compared with the values predicted by various methods |
B 93 Bulanov, N. V. Mode of Bubble Boiling of Emulsion with a Low-Boiling Dispersed Phase [Text] / N. V. Bulanov, B. M. Gasanov, V. G. Baidakov // Heat Transfer Research. - 2002. - V. 33, N 3-4. - P166-168 . - ISSN 1064-2285 Рубрики: ФИЗИКА Кл.слова (ненормированные): КИПЕНИЕ ПУЗЫРЬКОВОЕ -- ПУЗЫРЬКОВОЕ КИПЕНИЕ -- ЭМУЛЬСИИ -- ДИСПЕРСНЫЕ ФАЗЫ -- ФАЗЫ ДИСПЕРСНЫЕ -- НИЗКОКИПЯЩИЕ ФАЗЫ -- ФАЗЫ НИЗКОКИПЯЩИЕ -- ТЕПЛОПЕРЕНОС -- ЖИДКОСТИ Аннотация: The results of the experimental investigations on the heat transfer of thin wires with water/oil and ether/water emulsions are given. The temperature of normal oil boiling is not lower than 340°C. A considerable delay in the crisis of bubble boiling is obtained for both emulsions, and is particularly noticeable for the ether/water emulsion. In the latter case the coefficient of connective heat transfer and the density of heat flux substantially exceed the corresponding values for pure initial liquids in the entire investigated range of temperatures (from 20 to 230°C) and pressures (from 0.1 to 3.6 MPa) |
N 64 Nikitin, E. D. (Gas+liquid) critical temperatures and pressures of polyethelene-glycols from HOCH2CH2OH to H(OCH2CH2)v=132OH [Text] / E. D. Nikitin, P. A. Pavlov, A. P. Popov // Journal of Chemical Thermodynamics. - 1995. - V. 27, №1. - P43-51 Рубрики: ФИЗИКА Кл.слова (ненормированные): ЛИТЬЕ -- жидкости -- ТЕМПЕРАТУРА КРИТИЧЕСКАЯ -- КРИТИЧЕСКАЯ ТЕМПЕРАТУРА -- ДАВЛЕНИЕ -- ПОЛИЭТИЛЕН-ГЛЮКОЛЬ -- HOCH2CH2OH -- H(OCH2CH2)v=132OH -- H -- O (КИСЛОРОД) -- C -- ВОДОРОД -- КИСЛОРОД -- УГЛЕРОД Аннотация: The critical temperatures and pressures of mono-, di-, tri-, and tetra-ethene glycols, and polyethene glycols with nominal molar massesM/M°(whereM°= 1 g·mol−1) equal to 300, 400, and 600, have been measured by the pulse-heating method applicable to thermally unstable substances. The results have been correlated as a function of the molar mass using the hole theory of liquids developed by Kurata and Isida with a slight modification |
B 16 Baidakov, V. G. Nucleation in a superheated nitrogen-helium solution [] / V. G. Baidakov // Chemical Physics Letters. - 2008. - Vol. 462, № 4-6. - С. 201-204 Рубрики: ФИЗИКА Кл.слова (ненормированные): HELIUM Аннотация: The method of lifetime measurement has been used to investigate the nucleation of the vapor phase in a superheated liquid nitrogen–helium solution. Temperature dependences of the mean lifetime of a metastable solution have been obtained in experiments at pressures p = 0.5, 1.0 MPa and several values of the mixture concentration. The nucleation rate J has been calculated. It varied in experiments from 104 tо 108 s?1 m?3. The results of experiments are compared with homogeneous nucleation theory. The paper deals with the size effect on the surface tension of a nucleus and the work of its formation. \\\\Expert2\\nbo\\Chemical Physics Letters\\2008, v. 462, p.201.pdf |
V 70 Vinogradov, V. E. Explosive cavitation in superheated liquid argon [Text] / V. E. Vinogradov, P. A. Pavlov, V. G. Baidakov // Journal of Chemical Physics. - 2008. - Vol. 128, № 23. - P234508/1-234508/6 Рубрики: ФИЗИКА Кл.слова (ненормированные): ARGON Аннотация: The kinetics of explosive boiling-up of liquid argon has been investigated at negative pressures created by the reflection of a compression pulse 3–5 µs long from the free surface of a liquid by the method of liquid pulse heating on a thin platinum wire (with a rate of temperature increase of about 1 K/µs). The limiting superheats T* (stretches p*), the effective nucleation rate J*, and the derivative GT=(d ln J/dT)T=T* have been determined by experimental data on the thermal perturbation of a wire probe and the results of solution of the problem on the initial stage of explosive boiling-up of a liquid. The experimental data are compared with homogeneous nucleation theory. \\\\Expert2\\nbo\\Journal of Chemical Physics\\2008, v.128, p.234508.pdf |
C 74 Computer simulation of nucleation in a gas-saturated liquid [Electronic resource] / S. P. Protsenko, V. G. Baidakov, A. S. Teterin, E. R. Zhdanov // Journal of Chemical Physics. - 2007. - Vol. 126, № 9. - P094502/1-094502/14 Рубрики: ФИЗИКА Кл.слова (ненормированные): LIQUID Аннотация: Molecular dynamics methods have been used to investigate the kinetics of the liquid-gas phase transition in a two-component Lennard-Jones system at negative pressures and elastic stretches of the liquid to values close to spinodal ones. The molecular dynamics system consists of 2048 interacting particles with parameters of the Lennard-Jones potential for argon and neon. Density dependences of pressure and internal energy have been calculated for stable and metastable states of the mixture at a temperature T*?0.7±0.01 and three values of the concentration. The location of mechanical and the diffusion spinodals has been determined. It has been established that a gas-saturated mixture retains its stability against finite variations of state variables up to stretches close to the values near the diffusion spinodal. The statistic laws of the process of destruction of the metastable state have been investigated. The lifetimes of the metastable phase have been determined. It is shown that owing to the small height of the potential barrier that separates the microheterogeneous from the homogeneous state a system of finite size has a possibility to make the reverse transition from the microheterogeneous into the homogeneous state. The lifetimes of the system in the microheterogeneous state, as well as the expectation times of the occurrence of a critical nucleus, are described by Poissonian distributions. \\\\Expert2\\NBO\\Journal of Chemical Physics\\2007, v.126, p.094502, S.P.Protsenko.pdf |
B 16 Baidakov, V. G. Singular Point of a System of Lennard-Jones Particles at Negative Pressures [Electronic resource] / V. G. Baidakov, S. P. Protsenko // Physical Review Letters. - 2005. - Vol. 95, № 1. - P015701/1-015701/4 Рубрики: ФИЗИКА Кл.слова (ненормированные): LENNARD-JONES FLUID Аннотация: The method of molecular dynamics is used in a system of 2048 Lennard-Jones particles to determine the spinodal of a stretched liquid and crystal and the lines of their phase equilibrium at negative pressures. It is shown that a metastable extension of the melting line does not reach the zero isotherm, and ends on the spinodal of a stretched liquid. The point of termination of metastable liquid-crystal phase equilibrium is the singular point at a thermodynamic surface of states. \\\\Expert2\\NBO\\Physical Review Letters\\2005. v.95, p.015701.pdf |
N 64 Nikitin, E. D. Vapor-liquid critical properties of some tetraalkoxysilanes [Текст] / E. D. Nikitin, A. P. Popov, V. A. Simakina // Journal of Chemical & Engineering Data. - 2008. - Vol. 53, № 6. - С. 1371-1374 Рубрики: ФИЗИКА Кл.слова (ненормированные): VAPOR-LIQUID Аннотация: The critical pressures and the critical temperatures of ten tetraalkoxysilanes (tetraalkyl esters of silicic acid) Si[O(CH2)nH]4 with n = 1 to 10 have been measured. All the substances studied begin to decompose at temperatures below their critical points. The method of pulse-heating applicable to thermally unstable compounds has been used. Residence times were from (0.03 to 1) ms, which resulted in little decomposition of the substances during measuring. The experimental critical properties of tetraalkoxysilanes have been compared with the values estimated by the group-contribution methods of Lydersen and Nannoolal et al \\\\Expert2\\NBO\\Journal of Chemical and Engineering Data\\2008, v.53, p. 1371.pdf |
N 64 Nikitin, E. D. Critical Point Measurements for n-Alkyl Benzoates (C8 to C13) [Текст] / E. D. Nikitin, A. P. Popov, Yu. G. Yatluk // Journal of Chemical & Engineering Data. - 2007. - Vol. 52, № 4. - С. 1336-1339 Рубрики: ФИЗИКА Кл.слова (ненормированные): ALKYL BENZOATES Аннотация: The critical temperatures and critical pressures of six n-alkyl benzoates C6H5COO(CH2)nH with n = 1 to 6 have been measured. All the substances are thermally unstable at their critical points. The method of pulse-heating of a wire probe placed into the liquid under study has been used. Residence times are from (0.03 to 1) ms, which results in little decomposition of the liquid in the course of measuring. The experimental critical properties of alkylbenzoates have been compared with the values estimated by the group contribution methods of Constantinou and Gani and Marrero and Gani. ?? \\\\Expert2\\NBO\\Journal of Chemical and Engineering Data\\2007, v.52, p.1336.pdf |
N 64 Nikitin, E. D. Vapor-Liquid Critical Properties of Phenol and (C8 to C10)Phenylalkanols [Текст] / E. D. Nikitin, A. P. Popov, Yu. G. Yatluk // Journal of Chemical & Engineering Data. - 2007. - Vol. 52, № 1. - С. 315-317 Рубрики: ФИЗИКА Кл.слова (ненормированные): VAPOR-LIQUID Аннотация: The critical pressures and temperatures of phenol and three phenylalkanols C6H5(CH2)nOH with n = 2 to 4 have been measured. These substances are thermally unstable at their critical points. The pulse-heating method with ultralow residence times has been used. Residence times are from (0.03 to 1) ms. The experimental critical properties of phenol and phenylalkanols have been compared with the values calculated using the group-contribution methods by Constantinou and Gani and by Marrero and Gani \\\\Expert2\\NBO\\Journal of Chemical and Engineering Data\\2007, v.52, p.315.pdf |
V 28 Vapor Pressures, Enthalpies of Vaporization, and Critical Parameters of a Series of Linear Aliphatic Dimethyl Esters of Dicarboxylic Acids [Текст] / S. P. Verevkin, S. A. Kozlova, V. N. Emel'yanenko, E. D. Nikitin, A. P. Popov, E. L. Krasnykh // Journal of Chemical & Engineering Data. - 2006. - Vol. 51, № 5. - С. 1896-1905 Рубрики: ФИЗИКА Кл.слова (ненормированные): VAPOR PRESSURES Аннотация: Vapor pressures and the molar enthalpies of vaporization of the linear aliphatic dimethyl esters of dicarboxylic acids CH3-CO2-(CH2)n-CO2-CH3 with n = (0 to 8) have been determined by the transpiration method. A linear correlation of enthalpies of vaporization (at T = 298.15 K) of the esters studied with the number n and with the Kovat's indices and has been found. The critical temperatures and pressures of the esters with n = (0 to 6) and n = 8 have been measured by the pulse-heating method with the residence times ranging from (0.03 to 1) ms. Experimental data on the critical properties are compared with the estimations by group contribution methods by Constantinou and Gani and by Marrero and Gani. Both methods considerably underestimate the critical temperatures of the esters studied; however, the method by Marrero and Gani provides the prediction of the critical pressures of the esters with an average absolute error approximately equal to the uncertainty of the measurements. ?? \\\\Expert2\\NBO\\Journal of Chemical and Engineering Data\\2006, v.51, p.1896.pdf |
N 64 Nikitin, E. D. Critical-Point Measurements for Phenylethanoic to 7-Phenylheptanoic Acids [Текст] / E. D. Nikitin, A. P. Popov, Yu. G. Yatluk // Journal of Chemical & Engineering Data. - 2006. - Vol. 51, № 4. - С. 1335-1338 Рубрики: ФИЗИКА Кл.слова (ненормированные): ACIDS Аннотация: The critical temperatures and pressures of phenylalkanoic acids with a straight alkyl chain C6H5(CH2)nCOOH (n = 1 to 6) have been measured. The method of pulse heating of a wire probe placed into the substance under study has been used. The method minimizes the thermal decomposition because residence times are from (0.035 to 1) ms. An equation for the correlation of the critical pressures of phenylalkanoic acids with the number of CH2 groups between phenyl and carboxyl functional groups and molar mass has been obtained. The experimental critical constants of phenylalkanoic acids have been compared with the values calculated by the group-contribution methods of Constantinou and Gani and Marrero and Gani. ?? \\\\Expert2\\NBO\\Journal of Chemical and Engineering Data\\2006, v.51, p.1335.pdf |
N 64 Nikitin, E. D. Critical Temperatures and Pressures of 12 Phthalates Using the Pulse-Heating Method [Текст] / E. D. Nikitin, A. P. Popov, Yu. G. Yatluk // Journal of Chemical & Engineering Data. - 2006. - Vol. 51, № 4. - С. 1326-1330 Рубрики: ФИЗИКА Кл.слова (ненормированные): CRITICAL TEMPERATURES Аннотация: The critical temperatures and pressures of phthalates with the straight side alkyl chains C6H4?1,2-[COO(CH2)nH]2 (n is from 1 to 11) as well as bis(2-ethylhexyl) phthalate have been measured. No literature data are available for the critical properties of phthalates. Since phthalates decompose at temperatures well below their critical temperatures, the method of pulse heating of a wire probe immersed into the liquid under study has been used. The method minimizes the effect of thermal decomposition because residence times are only from (0.035 to 1) ms. The experimental critical properties of phthalates have been compared with the values calculated using the group-contribution methods by Constantinou and Gani and Marrero and Gani. ?? \\\\Expert2\\NBO\\Journal of Chemical and Engineering Data\\2006, v.51, p.1326.pdf |
N 64 Nikitin, E. D. Critical Pressures and Temperatures of n-Diaminoalkanes (C2 to C12) [Текст] / E. D. Nikitin, A. P. Popov, Yu. G. Yatluk // Journal of Chemical & Engineering Data. - 2006. - Vol. 51, № 2. - С. 609-111 Рубрики: ФИЗИКА Кл.слова (ненормированные): CRITICAL PRESSURES Аннотация: The critical temperatures and pressures of eight n-diaminoalkanes NH2(CH2)nNH2 with n = 2, 3, 4, 6, 8, 9, 10, and 12 have been measured. The method of pulse heating of a wire probe immersed into the liquid under study has been used. Residence times are from (0.03 to 1) ms. The critical properties of diaminoalkanes have been estimated by the group-contribution methods by Joback and Reid, Constantinou and Gani, and Marrero and Gani. These properties have also been calculated using a method based on the assumption that the functions describing the dependence of the critical properties of homologous series on the number of mers in a molecule should be self-similar and provide the scaling behavior for long-chain molecules. The last method provides the best accuracy in calculating the critical properties of diaminoalkanes. For this method, the average absolute errors are equal to 0.4 % for the critical temperature and about 2 % for the critical pressure. ?? \\\\Expert2\\NBO\\Journal of Chemical and Engineering Data\\2006, v.51, p.609.pdf |
N 64 Nikitin, E. D. Critical properties of long-chain substances from the hypothesis of functional self-similarity [Текст] / E. D. Nikitin, P. A. Pavlov, N. S. Bogatishcheva // Fluid Phase Equilibria. - 2005. - Vol. 235, № 1. - С. 1-6 Рубрики: ФИЗИКА Кл.слова (ненормированные): CRITICAL STATE -- METHOD OF CALCULATION -- ALKANES -- ALKANOLS -- ALKANONES Аннотация: A method for the construction of the functions fitting the critical properties of homologous series is presented. The method is based on the hypothesis of functional self-similarity and the scaling behaviour of the critical constants of long-chain molecules. Equations for calculating the critical temperatures and pressures of the homologous series with the common formula H(CH2)nR, where R is a radical have been obtained. The parameters of the equations have been determined from experimental data for six homologous series. The presented method allows predicting the critical temperatures or pressures of any member of a homologous series of the given type if the critical temperature/pressure of one substance, which belongs to this series, is known. The proposed method provides better accuracy in comparison with currently used group-contribution methods for most of the homologous series considered. \\\\Expert2\\NBO\\Fluid Phase Equilibria\\2005. v.235, p.1-6.pdf |
F 17 Faizullin, M. Z. Estimation of the stability limit of metallic crystals under conditions of isothermal stretching [Текст] / M. Z. Faizullin, V. P. Skripov // High Temperature. - 2007. - Vol. 45, № 6. - С. 803-806 Рубрики: ФИЗИКА Кл.слова (ненормированные): METALLIC CRYSTALS Аннотация: Based on the results of analysis of behavior of the thermodynamic properties of metals, a semiempirical method is suggested for calculating the limit of thermodynamic stability of crystalline state under conditions of isothermal stretching. The pressure and volume on the spinodal at temperatures of 0 and 300 K are estimated for a group of metals, and the stability limit of lead is calculated in the temperature range from 0 K to the melting point. The correlation between limiting pressures on the melting line and on the spinodal of crystal at T > 0 is revealed. \\\\Expert2\\NBO\\High Temperature\\2007, v.45, p.803.pdf |
B 16 Baidakov, V. G. Experimental-study of cryogenic liquids in the metastable superheated state [] / V. G. Baidakov, V. P. Skripov // Experimental Thermal and Fluid Science. - 1992. - V.5, Is.5. - С. 664-678 Рубрики: ФИЗИКА Кл.слова (ненормированные): LIQUID CRYOGENIC -- STATE METASTABLE -- STATE SUPERHEATED -- DEPENDENCE OF TEMPERATURE -- NUCLEATION -- p-PROPERTIES -- rho-PROPERTIES -- T-PROPERTIES -- ULTRASOUND VELOCITY Аннотация: The results of an experimental investigation of cryogenic liquids in a metastable (superheated) state are considered. Data are presented on the maximum attainable superheat temperature of typical cryogenic liquids from atmospheric to close to critical pressures. The nucleation mechanism and the influence of factors that induce boiling on the attainable superheat of liquids are discussed. The results of experiments are compared with theory. Data on the thermodynamic properties (P, rho, T properties, heat capacity, ultrasonic velocity and attenuation, volume viscosity) of cryogenic liquids in a metastable liquids is discussed. Explosive boiling phenomena connected with large superheats of cryogenic liquids are considered, and the discharge of cryogenic liquids through short tubes and the heat interaction of cold liquid droplets with a hot surface are investigated |
F 17 Faizullin, M. Z. Lines of Some Photoorganic Substance Melting at Pressures up to 230 MPA [] / M. Z. Faizullin // Zhurnal Fizicheskoi Khimii. - 1985. - V.59, Is.1. - С. 245-246 Рубрики: ФИЗИКА Кл.слова (ненормированные): PHOTOORGANIC SUBSTANCE |
P 93 Protsenko, S. P. Tensile Strength of two-dimensional Lennard-Jones Crystals. 1. Static Aspect [] : static Aspect / S. P. Protsenko, V. G. Baidakov, A. Y. Komarov // Journal of Structural Chemistry (Russia). - 1995. - V.36, Is.1. - С. 36-42 Рубрики: ФИЗИКА Кл.слова (ненормированные): CRYSTAL LENNARD-JONES -- ASPECT STATIC -- CRYSTAL TWO-DIMENSIONAL -- DEPENDENCE OF TEMPERATURE -- ISOTHERMS Аннотация: The molecular dynamic method is employed to study the thermodynamic perameters of a two-dimensional Lennard-Jones crysyal at negative pressures. The calculations are performed for five isotherms. The lowest temperature approaches absolute zero, and the highest temperature is 35% lower that than of the triple point. The limits of attainable tension and the thermodynamic stability of the crystal as well as the lifetimes of the ultimately strained states and the relaxation times in a disordering in the crystal are estimated. The thermal characteristics of disordering in the crystalline state are revealed and investigated \\\\Cserver\\dist\\НБО\\Электронная библиотека_Библиогр1\\Journal of Structural Chemistry\\1995, V. 36, N 1, p.36.pdf |
N 64 Nikitin, E. D. Critical temperatures and pressures of some alkanoic acids (C2 to C22) using the pulse-heating method [] / E. D. Nikitin, P. A. Pavlov, A. P. Popov // Fluid Phase Equilibria. - 2001. - Vol. 189, N 1-2. - С. 151-161. - Bibliogr: p. 160-161 (26 n.) . - ISSN 0378-3812 Рубрики: ФИЗИКА Кл.слова (ненормированные): CRITICAL TEMPERATURES -- CRITICAL PRESSURES -- ACIDS -- ALKANOIC ACIDS -- PULSE-HEATING METHOD -- LIQUIDS -- NUMBER OF CARBON ATOMS -- MOLAR MASS Аннотация: This paper presents experimental critical temperatures and pressures of 12 alkanoic acids CnH2nO2 with carbon numbers from 2 to 22. The method of pulse heating of a wire probe placed in the liquid under study has been used. Equations for the correlation of the critical temperatures and pressures of alkanoic acids with the number of carbon atoms and molar mass have meen obtained. |