Ana María Gayol González | Universidade de Vigo (original) (raw)

Papers by Ana María Gayol González

ACTAS DEL VI CONGRESO INVESTIGACIÓN, DESARROLLO E INNOVACIÓN DE LA UNIVERSIDAD INTERNACIONAL DE CIENCIA Y TECNOLOGÍA IDI - UNICyT 2021

En este trabajo se demuestra que el uso de las tecnologías se puede hacer mucho más entretenido e... more En este trabajo se demuestra que el uso de las tecnologías se puede hacer mucho más entretenido e interesante para el alumnado que cursa Química en todas las etapas, mediante el uso de videos, clases invertidas o flipped classroom. De este modo, el alumnado verá en internet materiales elaborados por su docente en la propia web del profesor, además de realizar alguna búsqueda por medios propios para tener un conocimiento de lo que va a versar la clase y de este modo la parte teórica con algún ejemplo o practica virtual se imparte en menos tiempo, lo que hace que haya más tiempo para resolución de problemas y prácticas de laboratorio en el centro educativo.

En este libro se realiza un estudio de los sistemas binarios y ternarios resultantes de la combin... more En este libro se realiza un estudio de los sistemas binarios y ternarios resultantes de la combinacion de carbonatos (dimetilcarbonato o dietilcarbonato) + p-xileno + n-alcanos (n-octano o n-decano). La finalidad es conocer su comportamiento debido a que su aplicacion es muy importante en las industrias frigorifica, farmaceutica y quimica. Es de destacar su aplicacion como refrigerantes, agentes naturales, lubricantes, petroleo y disolventes.

En este libro se desarrolla un Plan de Marketing para una pequena y mediana empresa (PYME). Su fu... more En este libro se desarrolla un Plan de Marketing para una pequena y mediana empresa (PYME). Su funcion es desarrollar un estudio de mercado, con objeto de la creacion de una pequena empresa. Esta dirigido a emprendedores y personas que esten interesadas en la creacion y gestion de la pequena empresa. Este trabajo se ha realizado en el campo de la Gestion y Direccion Comercial, Marketing, Publicidad y Comunicacion.

Journal of Chemical Thermodynamics, Oct 21, 2013

New data of high pressure density have been reported for p-xylene pure component and its binary m... more New data of high pressure density have been reported for p-xylene pure component and its binary mixtures with dimethyl carbonate, diethyl carbonate, n-octane and n-decane at (288.15, 298.15 and 308.15) K and (0.1, 5, 10, 20, 30 and 40) MPa and they have been compared with those available in the literature. The high pressure density has been correlated and predicted using a modified Tait equation and Nitta Chao group contribution model respectively. The derived thermophysical properties such as isothermal compressibility (jT), isobaric thermal expansivity (aP) and internal pressure (p) have been also calculated.

The Journal of Chemical Thermodynamics, 2014

New data of high pressure density have been reported for p-xylene pure component and its binary m... more New data of high pressure density have been reported for p-xylene pure component and its binary mixtures with dimethyl carbonate, diethyl carbonate, n-octane and n-decane at (288.15, 298.15 and 308.15) K and (0.1, 5, 10, 20, 30 and 40) MPa and they have been compared with those available in the literature. The high pressure density has been correlated and predicted using a modified Tait equation and Nitta Chao group contribution model respectively. The derived thermophysical properties such as isothermal compressibility (j T ), isobaric thermal expansivity (a P ) and internal pressure (p) have been also calculated.

The Journal of Chemical Thermodynamics, 2013

The present work reports valuable experimental high-pressure density data for dimethyl carbonate,... more The present work reports valuable experimental high-pressure density data for dimethyl carbonate, diethyl carbonate, n-octane, n-decane pure components and their binary mixtures (dialkyl carbonate + n-alkane) at temperatures between (288.15 and 308.15) K and pressures between (0.1 and 40) MPa. The experimental density values were compared with experimental information available in the literature. While the volumetric properties for (dimethyl carbonate + n-alkane) were reported in many works, the (diethyl carbonate + n-alkane) were less studied. The purpose of this study is to extend the available experimental information about the thermophysical behavior of this kind of mixtures, which is useful in the fuel field. The experimental density data were correlated using a modified Tait equation and were predicted by Nitta-Chao group contribution model.

$Research paper thumbnail of Refractive indices, excess molar volumes and isentropic compressibilities of the mixture of ethanol + n-hexane + n-nonane in function of the temperature$

Physics and Chemistry of Liquids, Mar 6, 2013

This study presents the analysis of different thermodynamic properties (refractive indices, exces... more This study presents the analysis of different thermodynamic properties (refractive indices, excess molar volumes and ultrasonic velocity) and the temperature dependence of the ternary mixture ethanol þ n-hexane þ n-nonane at the range 288.15-323.15 K and atmospheric pressure. The derived properties were computed from experimental data and were fitted to the Cibulka equation.

Physics and Chemistry of Liquids, 2012

This article presents the analysis of the following physical properties such as refractive indice... more This article presents the analysis of the following physical properties such as refractive indices, excess molar volumes, sound velocity and the temperature dependence of the ternary system ethanol þ n-hexane þ n-octane in the temperature range 288.15-323.15 K at atmospheric pressure. The derived properties are calculated from data obtained experimentally and fitted to Cibulka equation.

Monatshefte für Chemie - Chemical Monthly, 2007

$Research paper thumbnail of Density, speed of sound, refractive index and derivatives properties of the binary mixture n-hexane + n-heptane T = 288.15 – 313.15 K$

Physics and Chemistry of Liquids

This article reports experimental values of refractive index nD, density ρ, speed of sound u, is... more This article reports experimental values of refractive index nD, density ρ, speed of
sound u, isentropic compressibility κs, excess molar volume of mixing VE, deviations
of refractive index δnD and isentropic compressibility δκs of the binary mixture
n-hexane + n-alkane from T = (288.15 to 323.15) K and atmospheric condition. The
corresponding excess derived property was computed from the experimental data.
Parameters of analytical expressions which represent the composition dependences
of the derived property are reported. Values of physical properties were compared with
the results obtained by different prediction methods.

Physics and Chemistry of Liquids, Nov 25, 2012

This present article shows the analysis of different physico-chemical properties (density, speed... more This present article shows the analysis of different physico-chemical properties
(density, speed of sound and refractive index) and excess properties (excess volume,
excess isentropic compressibility and refractive index deviation) and the temperature
dependence of the ternary mixture ethanol + n-hexane + n-heptane in the range
288.15–323.15 K and at atmospheric pressure. The derived properties were computed
from the experimental data and were fitted to the Cibulka equation.

$Research paper thumbnail of Refractive indices, excess molar volumes and isentropic compressibilities of the mixture of ethanol + n-hexane + n-nonane in function of the temperature$

Physics and Chemistry of Liquids, 2013, Oct 4, 2012

This study presents the analysis of different thermodynamic properties (refractive indices, exce... more This study presents the analysis of different thermodynamic properties
(refractive indices, excess molar volumes and ultrasonic velocity) and the
temperature dependence of the ternary mixture ethanolþn-hexaneþ
n-nonane at the range 288.15–323.15K and atmospheric pressure. The
derived properties were computed from experimental data and were fitted
to the Cibulka equation.

Physics and Chemistry of Liquids, Aug 8, 2012

This article presents the analysis of the following physical properties such as refractive indic... more This article presents the analysis of the following physical properties such
as refractive indices, excess molar volumes, sound velocity and the
temperature dependence of the ternary system ethanolþn-hexaneþ
n-octane in the temperature range 288.15–323.15K at atmospheric
pressure. The derived properties are calculated from data obtained
experimentally and fitted to Cibulka equation.

$Research paper thumbnail of Refractive indices, excess molar volumes and isentropic compressibilities of the mixture of ethanol + n-hexane + n-nonane in function of the temperature$

Physics and Chemistry of Liquids, Oct 4, 2012

This study presents the analysis of different thermodynamic properties (refractive indices, exce... more This study presents the analysis of different thermodynamic properties
(refractive indices, excess molar volumes and ultrasonic velocity) and the
temperature dependence of the ternary mixture etanol+n-hexane+
n-nonane at the range 288.15–323.15K and atmospheric pressure. The
derived properties were computed from experimental data and were fitted
to the Cibulka equation.

ACTAS DEL VI CONGRESO INVESTIGACIÓN, DESARROLLO E INNOVACIÓN DE LA UNIVERSIDAD INTERNACIONAL DE CIENCIA Y TECNOLOGÍA IDI - UNICyT 2021

Journal of Chemical Thermodynamics, Oct 21, 2013

The Journal of Chemical Thermodynamics, 2014

New data of high pressure density have been reported for p-xylene pure component and its binary m... more New data of high pressure density have been reported for p-xylene pure component and its binary mixtures with dimethyl carbonate, diethyl carbonate, n-octane and n-decane at (288.15, 298.15 and 308.15) K and (0.1, 5, 10, 20, 30 and 40) MPa and they have been compared with those available in the literature. The high pressure density has been correlated and predicted using a modified Tait equation and Nitta Chao group contribution model respectively. The derived thermophysical properties such as isothermal compressibility (j T ), isobaric thermal expansivity (a P ) and internal pressure (p) have been also calculated.

The Journal of Chemical Thermodynamics, 2013

$Research paper thumbnail of Refractive indices, excess molar volumes and isentropic compressibilities of the mixture of ethanol + n-hexane + n-nonane in function of the temperature$

Physics and Chemistry of Liquids, Mar 6, 2013

Physics and Chemistry of Liquids, 2012

Monatshefte für Chemie - Chemical Monthly, 2007

$Research paper thumbnail of Density, speed of sound, refractive index and derivatives properties of the binary mixture n-hexane + n-heptane T = 288.15 – 313.15 K$

Physics and Chemistry of Liquids

Physics and Chemistry of Liquids, Nov 25, 2012

$Research paper thumbnail of Refractive indices, excess molar volumes and isentropic compressibilities of the mixture of ethanol + n-hexane + n-nonane in function of the temperature$

Physics and Chemistry of Liquids, 2013, Oct 4, 2012

Physics and Chemistry of Liquids, Aug 8, 2012

$Research paper thumbnail of Refractive indices, excess molar volumes and isentropic compressibilities of the mixture of ethanol + n-hexane + n-nonane in function of the temperature$

Physics and Chemistry of Liquids, Oct 4, 2012

This study presents the analysis of different thermodynamic properties (refractive indices, exce... more This study presents the analysis of different thermodynamic properties
(refractive indices, excess molar volumes and ultrasonic velocity) and the
temperature dependence of the ternary mixture etanol+n-hexane+
n-nonane at the range 288.15–323.15K and atmospheric pressure. The
derived properties were computed from experimental data and were fitted
to the Cibulka equation.

Aqueous two phase systems are formed by mixing Triton X-102 and one aqueous solution of sodium su... more Aqueous two phase systems are formed by mixing Triton X-102 and one aqueous solution of sodium sulphate (Na2SO4). The equilibrium diagram for this experimental system was obtained by the cloud point method and also tie lines were determined. This present work analyses several physical properties: refractive index, density and speed of sound of the ternary system Triton X-102 + Water + Na2SO4 in the homogeneous zone for temperatures between 288.15 and 318.15 K and atmospheric pressure. Density () of pure components and the ternary mixtures of different compounds Triton X-102 + Water + Na2SO4 was measured with an Anton Paar DSA 5000 vibrating tube densimeter. Refractive index was determined using an Abbemat Automatic Refractometer. These behaviors consist in an increase in the density and refractive index when the mixture is enriched in polymer. In relation to the effect of temperature, when the temperature is high, density and refractive index decrease. On the other hand , speed of sound data for this system shows a different behavior depending the quantity of polymer: at low Triton X-102 concentration, speed of sound increases with temperatures, but at high polymer concentration, the opposite behavior was found (Figure1).This change in the influence of temperature is due to aggregation phenomenon of Triton X-102 in aqueous solution.

Present work includes original density measurements of diethyl carbonate + n-octane over the ent... more Present work includes original density measurements of diethyl carbonate + n-octane over the entire composition range that were performed up to 40 MPa and from 288.15 to 308.15 K with an interval of 10 K.
The binary mixtures were prepared by mass using a Mettler AE-240 balance, the materials had been previously degassing

This work presents the study of experimental high-pressure density data for diethyl carbonate + ... more This work presents the study of experimental high-pressure density data for diethyl carbonate + n-decane binary system1, in the pressure range between 0.1 MPa to 40 MPa, and in the temperature range from 288.15 K to 308.15 K. The experimental values were then predicted by Nitta –Chao group contribution model.
The interest on the study of this mixture lies in the fact that diethyl carbonate2,3 has been considered as replacement of traditional oxygenated gasoline additive, because is non-toxic and environmentally friendly product capable to reduce pollutant emissions as carbon monoxide.
Nitta-Chao4 is a group contribution model for the prediction of density based on the cell where the repulsive forces between molecules are expressed by a modified cell partition function derived from Carnahan–Starling EoS. Diethyl carbonate and n-decane were described by the molecular groups, methyl (-CH3), methylene( -CH2) and carbonate (-OCOO-)

En este trabajo se presentan las medidas de densidad a presión del sistema binario dietilcarbonat... more En este trabajo se presentan las medidas de densidad a presión del sistema binario dietilcarbonato + n-decano que se estudia en todo el rango de concentraciones. Las medidas se han relizado en un rango de presión que oscila entre 0.1 MPa a 40 MPa y el rango de temperatura desde 288.15 a 308.15 K con un intervalo de10 K.
Las muestras del sistema binario se han preparado mediante peso de la masa, utilizando una balanza Mettler AE-240, los reactivos han sido previamente desgasificados.
La densidad a presión se ha medido con un densímetro Anton Paar DMA 512 P/60 de tubo-vibrador conectado a un densimetro Anton Paar DMA 4500 que facilita los datos de la densidad.

Estudio de mezclas carbonato + p-xileno + n-alcano Estudio teórico experimental Estudio de mezcla... more Estudio de mezclas carbonato + p-xileno + n-alcano Estudio teórico experimental Estudio de mezclas carbonato + p-xileno + n-alcano En este libro se realiza un estudio de los sistemas binarios y ternarios resultantes de la combinación de carbonatos (dimetilcarbonato ó dietilcarbonato) + p-xileno + n-alcanos (n-octano ó n-decano). La finalidad es conocer su comportamiento, debido a que su aplicación es muy importante en las industrias frigorífica, farmacéutica y química. Es de destacar, su aplicación como refrigerantes, agentes naturales, lubricantes, petróleo y disolventes.