Network


Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot


Dive into the research topics where M. Dolz is active.

Publication


Featured researches published by M. Dolz.


Journal of Pharmaceutical Sciences | 2000

A time-dependent expression for thixotropic areas. Application to Aerosil 200 hydrogels

M. Dolz; F. González; J. Delegido; M. J. Hernández; J. Pellicer

Experimental determination of the areas enclosed under the up curve, sigma = sigma(;gamma), corresponding to time zero, and the down curve, which would be obtained following complete rheodestruction of the system structure, is not an easy matter. In the present study a semi-empirical procedure for calculating the hypothetical values of these parameters is proposed. With these parameters it is possible to obtain a time-dependent expression for the thixotropic areas, S(T). This procedure has been applied to the study of the thixotropic behavior of Aerosil 200 hydrogels at different concentrations. The comparative analysis of these systems has been realized by studying the relative thixotropic areas and relative thixotropic rates that are obtained from S(T).


Journal of Dispersion Science and Technology | 1998

Rheological characterization of easy-to-disperse (ETD) Carbopol hydrogels

M. J. Hernández; J. Pellicer; Jesús Delegido; M. Dolz

Experimental determinations of apparent viscosity were used to investigate the rheological behaviour of easy-to-disperse (ETD) Carbopol 2001, 2020 and 2050 hydrogels, involving different polymer concentrations, degrees of neutralization, agitation times and shear rates. Mathematical expressions were obtained, based on the power law, to allow calculation of the viscosity of each system, for the different variables studied. These equations proved valid within the 5.5-7.5 pH range, i.e., the pH interval of greatest interest in pharmaceutics and cosmetics. The rheological behaviours of the three types of ETD hydrogels were investigated comparatively and with respect to Carbopol 940, i.e., one of the most widely utilized hydrogels.


Journal of Dispersion Science and Technology | 2008

Thixotropic Behavior of Salad Dressings Stabilized with Modified Starch, Pectin, and Gellan Gum. Influence of Temperature

M. J. Hernández; J. Dolz; Jesús Delegido; C. Cabeza; M. Dolz

The thixotropy of low‐oil salad dressing has been analyzed at different temperatures (8–26°C). The usual formulation containing modified starch (4%) was compared with others in which part of the starch had been substituted by pectin (0.5%) or different concentrations of gellan (0.1 and 0.5%). Up and down flow curves were measured, showing in all cases shear thinning behavior and fitting the Herschel‐Bulkley model. Thixotropic areas enclosed by the up curve and the corresponding different down curves, STh, were obtained. With the aim of establishing comparative results, and since the viscosities were quite different, the parameter considered was relative thixotropic area, SR (%)=100 (STh/Sup). These areas increased with agitation time and depended on temperature. Their tendencies were reproduced by equations SR=SRmax {1‐exp [‐f(t)]}, with f(t)=βt0.5, where the maximum relative thixotropic area, SRmax , increases with increasing temperature while β decreases. The parameter β has different values for each formulation, and indicates the time dependence. The emulsion formulated with pectin was found to be the most stable with temperature and agitation time, while the greatest thixotropy corresponded to the emulsion formulated with starch only. The thixotropic behavior of the emulsions formulated with gellan gum was seen to be intermediate between the two above formulations—the emulsion formulated with the largest percentage of gellan gum being the least thixotropic of both.


Journal of Dispersion Science and Technology | 1995

Pseudoplasticity and thixotropy of different types of starch hydrogels prepared with microcrystalline cellulose-sodium carboxymethyl cellulose

Jesús Delegido; M. Dolz; M.J. Hemdndez; J. Pellicer

ABSTRACT Based on experimental measurements of apparent viscosity and employing the Ostwald-de Waele model, a number of mathematical functions were obtained representing the pseudoplastic thixotropic behaviour of hydrogels prepared with microcrystalline cellulose-sodium carboxymethyl cellulose (MCC-NaCMC) and four types of starch of different origin (corn, potato, rice and wheat). The results obtained corresponding to each parameter of the model and for each gel were analyzed as a function of starch concentration and agitation time.


Journal of Dispersion Science and Technology | 1994

THE INFLUENCE OF STARCH ON THE RHEOLOGICAL BEHAVIOUR OF MICROCRYSTALLINE CELLULOSE HYDROGELS

M. Dolz; F. González; M. Herráez; O. Díez-Sales

ABSTRACT A study has been made of the influence of physical factors such as temperature, agitation time and shear rate upon the rheological behaviour of hydrogels composed of 2·5% microcrystalline cellulose -sodium carboxymethyl cellulose (Avicel RC 591(r), American Viscose Div., FMC Corp.) and different percentages of corn starch (0-3% by weight, w/w).


Food Hydrocolloids | 2008

Creep and recovery experimental investigation of low oil content food emulsions

M. Dolz; M. J. Hernández; Jesús Delegido


Journal of Petroleum Science and Engineering | 2007

Flow and thixotropy of non-contaminating oil drilling fluids formulated with bentonite and sodium carboxymethyl cellulose

M. Dolz; J. Jiménez; M. Jesús Hernández; Jesús Delegido; A. Casanovas


Journal of Pharmaceutical Sciences | 1995

Shear Stress Synergism Index and Relative Thixotropic Area

M. Dolz; M. J. Hernández; J. Pellicer; J. Delegido


Food Hydrocolloids | 2011

Cluster classification of dysphagia-oriented products considering flow, thixotropy and oscillatory testing

A. Casanovas; M. J. Hernández; E. Martí-Bonmatí; M. Dolz


Journal of Applied Polymer Science | 2009

Effect of carboxymethyl cellulose concentration on rheological behavior of milk and aqueous systems. A creep and recovery study

S. Bayarri; M. Dolz; M. J. Hernández

Collaboration


Dive into the M. Dolz's collaboration.

Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar

C. Cabeza

University of Seville

View shared research outputs
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar

F. Corrias

University of Valencia

View shared research outputs
Top Co-Authors

Avatar

J. Dolz

University of Valencia

View shared research outputs
Top Co-Authors

Avatar
Researchain Logo
Decentralizing Knowledge