Octavio Manero

Octavio Manero
Universidad Nacional Autónoma de México | UNAM · Materials Research Institute (IIM-UNAM)

professor

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281
Publications
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Publications

Publications (281)
Article
Desde el punto de vista reológico, las pulpas de mineral exhiben un comportamiento de un fluido no newtoniano del tipo adelgazante al flujo (n<1). Además, poseen una respuesta viscoelástica con una componente viscosa dominante sobre la componente elástica (G’’>G’) en la ventana de flujo. La cantidad de bacterias presentes y los elementos disueltos...
Article
Full-text available
Desde el punto de vista reológico, las pulpas de mineral exhiben un comportamiento de un fluido no newtoniano del tipo adelgazante al flujo (n<1). Además, poseen una respuesta viscoelástica con una componente viscosa dominante sobre la componente elástica (G’’>G’) en la ventana de flujo. La cantidad de bacterias presentes y los elementos disueltos...
Article
Full-text available
In this study, rheological techniques are used to measure the flow properties of blood from 52 patients with liver cirrhosis. A comparative analysis included a control group (23 persons) to determine the stage of the disease in cirrhotic patients. An important correlation relating the blood biochemical composition with the rheological response was...
Article
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This is the first on a series of articles that deal with nonlinear dynamical systems under oscillatory input that may exhibit harmonic and non-harmonic frequencies and possibly complex behavior in the form of chaos. Frequency response techniques of nonlinear dynamical systems are usually analyzed with numerical methods because, most of the time, an...
Article
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The main objective of this work is to demonstrate the agreement between the two-fluid linear Langevin formulation and that described by the extended irreversible thermodynamics (EIT). The two-fluid model, originally proposed by de Gennes, has been widely analyzed by many authors in various flow situations, especially to compare predictions with exp...
Article
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Non-equilibrium molecular dynamics are used in a coarse-grained scale to simulate the simple shear flow of telechelic and non-telechelic associative polymer solutions. The work includes the study of inception of flow and stress relaxation in transient flows and the constitutive curve at steady state. The instabilities (plateau stress, stress maxima...
Article
Acidithiobacillus thiooxidans is a microorganism of great interest in bio-hydrometallurgical processes, as it is potentially capable of treating complex, low-grade (purity) sulfur minerals. However, there are concerns in the metallurgical industry regarding the microbial manipulation due to problems arising related to cellular integrity, metabolic...
Article
In this work we present theoretical and experimental studies on the structure factor in micellar systems. Cetyl trimethyl ammonium tosilate (CTAT) solutions in absence of salts exhibit a flow behavior similar to polymer solutions, while upon an increase in the ionic strength with NaCl, their behavior changes to that of a kinetic-controlled breakage...
Article
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In this work, a spray‐drying process is used to encapsulate a probiotic strain of Lactobacillus plantarum with mixtures of Aloe vera mucilage (AVM) (Aloe barbadensis Miller) and agave fructans of high degree of polymerization (AFHDP). Physicochemical properties of the powders reveal moisture contents lower than 10% and water activity between 0.195...
Article
A mathematical model for pretreatment and hydrolysis of lignocellulosic biomasses in twin-screw extruders is presented. The model allows for calculation of the concentrations of extracted hemicellulose and sugars (xylose and glucose) at different operating conditions (pressure, temperature, NaOH and H2SO4 concentrations, as well as screw rotational...
Book
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Recent disasters caused by the spread of fire in buildings and in transportations remind us of the importance of fire protection. Using flame-retardant materials is one important element of the firefighting strategy, which aims to prevent fire development and propagation. These materials are used in different applications, such as in textiles, coat...
Article
The iron purity was increased by 3–4% by a bioleaching process. Zinc dissolution exceeded 50% during the first day of leaching. Bacteria concentration affects the rheological behavior of mineral pulps during bioleaching. The mineral pulp exhibited shear. The optimum bioleaching time was five days.
Book
Conference proceedings of the 33rd International conference of the Polymer Processing Society (PPS-33). Cancun. Mexico. 10–14 December 2017
Article
In this work, we analyze the kinetics of the entanglement‐disentanglement process of complex fluids coupled to a rheological constitutive equation of state within an irreversible thermodynamics framework. In the context of the coupling between the kinetics and the mechanical phenomena, we assume that the rate constants are functions of the affiniti...
Article
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The high flame-retardant loading required for ethylene-vinyl acetate copolymer blends with polyethylene (EVA-PE) employed for insulation and sheathing of electric cables represents a significant limitation in processability and final mechanical properties. In this work, melamine triazine (TRZ) and modified bentonite clay have been investigated in c...
Article
A biocomposite based on montmorillonite clay mineral (MMT) and hybrid biopolymer microparticles (MP) carrying atorvastatin (AC), these were designed for oral drug carrier was characterized by scanning and transmission electron microscopy (SEM &TEM), differential scanning calorimetry (DSC) and in vitro biocompatibility by cell viability on fibroblas...
Article
Mucilage of Aloe vera (Aloe barbadensis Miller) is an alternative agent for microencapsulation by spray drying of labile bioactives, such as gallic acid. The microstructure of powders prepared with Aloe vera and maltodextrin (used for comparison purposes) with and without gallic acid revealed defined and undamaged particles. Aloe vera particles wit...
Article
In this work, a new simplified method to find the fluidity enhancement of a non-Newtonian liquid under a pulsating (time-dependent) pressure gradient is analyzed. The fluidity enhancement is predicted by means of a Taylor series expansion of the flow rate in the vicinity of the applied wall stress. This expansion is shown to render the same results...
Research
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This patent details the coupling of an ultrasonic transducer to a rheometer to perform simoultaneously rheometric measures with ultrasound application
Patent
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Se preparó un nuevo material compuesto MP / MMT híbrido lípido-polímero con alta eficacia de entrampe de fármaco (> 60%) y se caracterizó por tamaño, potencial zeta, XRD, FT-IR, SEM y el comportamiento reológico. El grado de interacción entre la arcilla MMT y MP se estimó mediante experimentos de XRD y se encontró que los resultados eran fuertement...
Article
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A supercapacitor based on nitrile butadiene rubber substrate (NBR) and polypyrrole (PPy) was developed in this work. PPy was deposited on the surface of the substrate, NBR, which acts as a solid electrolyte in a sandwich arrangement, using a simple and fast in situ chemical synthesis, employing copper(II) perchlorate. The system was characterized b...
Article
Full-text available
In this work, curcumin was spray‐dried (SD) with Aloe vera mucilage as the encapsulating agent giving particular attention to the effect of the relevant process parameters (feed flow rate, atomization speed, and inlet air temperature) on the resulting properties of the SD powders. The powders obtained were analyzed by infrared spectroscopy, scannin...
Article
In this work, asphalt modifiers consisting of a series of poly(glycidyl methacrylate‐ran‐styrene)‐block‐poly(butyl acrylate)‐block‐poly(glycidyl methacrylate‐ran‐styrene) tri‐block copolymers (GS‐BA‐GS) were synthesized via reversible addition‐fragmentation chain transfer polymerization. Particular attention is given to the influence of controlled...
Article
Full-text available
In this work, we examine the shear-banding flow in polymer-like micellar solutions with the generalized Bautista-Manero-Puig (BMP) model. The couplings between flow, structural parameters, and diffusion naturally arise in this model, derived from the extended irreversible thermodynamics (EIT) formalism. Full tensorial expressions derived from the c...
Article
The main objective of this work is to demonstrate that non-local terms of the structure variable and shear-stress is a sufficient condition to predict multiple bands in rheologically complex fluids, i.e., shear-thickening fluids. Here, shear bands are considered as dissipative structures arising from spatial instabilities (Turing patterns) rather t...
Article
High density polyethylene (HDPE), linear low density polyethylene (LLDPE) and low density polyethylene (LDPE) are blended, and compared against a similar mixture but functionalized LDPE with maleic anhydride (MAh), HDPE‐LLDPE‐LDPE‐g‐MAh. In order to obtain nanocomposites from these polymer blends, a modified bentonite was added by incorporating l‐l...
Article
In this predominately predictive modelling finite volume/element study, a comparative analysis is performed for time-dependent and viscoelastoplastic flow in a circular contraction-expansion geometry of aspect-ratio 10:1:10. For this, a hybrid finite volume/element scheme is employed. A new and revised micellar model is investigated, under the deno...
Article
Full-text available
In this work, we prepared a novel composite based on hybrid gelatin carriers and montmorillonite clay (MMT) to analyze its viability as controlled drug delivery system. The objective of this research involves the characterization of composites formed by structured lipid-gelatin micro-particles (MP) and MMT clay. This analysis included the evaluatio...
Article
A set of analytical solutions to transient pressure and double-porosity (bilinear) flows in the Cartesian domain for constant and variable flow rated wells having hydraulic fractures are presented. Both finite and infinite-fracture reservoir systems with transient linear-flows for the fracture and the formation in wells intercepted by a finitecondu...
Article
Conference report for the 33rd International Conference of The Polymer Processing Society (PPS-33). December 10-14, 2017.
Article
Full-text available
Conference report for the 33rd International Conference of The Polymer Processing Society (PPS-33). December 10-14, 2017.
Article
The rheological behavior of micellar solutions is analyzed under non-homogeneous velocity and stress flow conditions. The framework is based on the extended irreversible thermodynamics and the transient network formulation coupled to the underlying kinetics embodying two relevant processes: formation of wormlike chains from a free micellar solution...
Article
Over recent years, there has been slow but steady progress towards the qualitative numerical prediction of observed behaviour when highly elastic Boger fluids flow in contraction geometries. This has led to an obvious desire to seek quantitative agreement between prediction and experiment, a subject which is addressed in the current paper. We concl...
Article
In this work, the effect of keratin biofiber on the properties of a thermoplastic starch biopolymer (TPS) is investigated. The keratin biofiber was obtained from tannery industry waste. The materials were compounded by reactive extrusion and injection molding. Traditional halogen-free Flame Retardant (FR) additives were used for comparison. Accordi...
Article
In this work, the effect of keratin biofiber on the properties of a thermoplastic starch biopolymer (TPS) is investigated. The keratin biofiber was obtained from tannery industry waste. The materials were compounded by reactive extrusion and injection molding. Traditional halogen-free Flame Retardant (FR) additives were used for comparison. Accordi...
Article
In this work, a comparative study between spray drying (SD) of fresh egg by either maltodextrin (MD) or nopal-mucilage (MN) as stabilizing vectors was made. The powders obtained were characterized for drying performance, moisture content, chemical proximate analysis, thermal analysis (TGA), chemical composition (FTIR), microscopy (SEM) and rheology...
Article
Full-text available
In this work, we study the diffusion of the interface between bands in wormlike micellar solutions that exhibit shear banding flow regimes, namely, systems undergoing coexistence of states of different shear rates along a constant stress plateau. The migration of the interface between bands possessing different birefringence levels is predicted by...
Article
Full-text available
In this work, the micro-macro approach is used to simulate the flow of dilute polymer solutions by means of a kinetic model coupled with the dynamics of a transient network. The transient network modeling is based on the original formulation, in which the kinetics of microstates describes the complexity of interactions among the macromolecules susp...
Article
In this work, comparative rheological tests on asphalt mixtures containing unmodified Montmorillonite (Mt) and two modified organo-Mt were carried out. The blended asphalt binders were characterized using softening point, penetration, and rheological tests, and compared with the unmodified asphalt. The nanostructure distribution of Mt platelets in...
Article
Full-text available
In this work, the rectilinear flow of a complex fluid (human blood) under a pulsating time-dependent pressure gradient is analyzed. A first approximation of the real case of blood flowing in a vein is described. The normalized pressure gradient simulates the pumping work of the heart while the flow geometry (circular tube) is assumed rigid, smooth,...
Article
Results on the shear flow of telechelic associative polymers using nonequilibrium molecular dynamics (NEMD) are presented. The particle stream velocities can be calculated from the peculiar velocities and the imposed velocity profile using a novel approach. The constitutive relationship stress–shear rate becomes nonmonotonic when the interaction fo...
Article
In this contribution a methodology to compute and classify shear-induced structural and phase transitions in surfactant/water mixtures from rheological measurements is presented. Non-linear rheological experiments, considering variations in surfactant concentration and temperature, are analyzed. In particular, the parameters of the BMP (Bautista-Ma...
Article
Full-text available
The rheological behavior of the ultrasound-induced gelation of poloxamer aqueous solutions (Pluronic F-127, Sigma-Aldrich) is analyzed in this work. A new rheometric technique isproposedinwhich ultrasonicpulsesare applied to the sample under shear flow. An ultrasonic transducer was adapted to the lower plate of a controlled-stress rheometer with a...
Article
This study is concerned with the continuum modelling of sharp-corner contraction-expansion axisymmetric flows, under contraction-ratio variation, and more particularly, in the precise capture of the large-levels of experimental excess pressure-drops (epd) for Boger fluids. The particular contraction-ratios (α) considered are those studied experimen...
Article
A statistical correlation to provide reasonable estimates of crude oiĺs SARA compositions (saturates, aromatics, resins, asphaltenes) from bubblepoint pressure and light-ends compositional data is presented. In developing the correlation, we collected experimental SARA compositions of 341 crude oils of different origin. The most-probable SARA compo...
Article
Full-text available
The steady and transient nonlinear rheological behaviors of dilute rod-like micellar solutions are predicted here with a particular case of the generalized Bautista–Manero–Puig (BMP) model that consists of the upper-convected Maxwell constitutive equation and a dissipative power-dependent kinetic equation, which takes into account the formation and...
Article
This study is concerned with finite element/volume modelling of contraction–expansion axisymmetric pipe flows for thixotropic and non-thixotropic viscoelastic models. To obtain solutions at high Weissenberg numbers (Wi) under a general differential form Wiτp∇=2(1−β)D−fτp, both thixotropic Bautista–Manero micellar and non-thixotropic EPTT f-function...
Article
In this work, the rheological behavior of flame retardant polypropylene composites produced by two methods: 1) twin-screw extrusion and 2) ultrasound application combined with a static mixer die single-screw extrusion is analyzed in detail; results are related to the morphology of the composites. The flame retardant polymer composites are composed...
Chapter
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This chapter deals with the properties and applications of clay mineral water dispersions and clay minerals as flame retardant additives for polymers. Clay minerals, such as kaolinites, micas, and smectites, are the basic constituents of clay raw materials, which are classically employed in the ceramic industry to produce porcelain, fine ceramics,...
Article
Abstract Aloe vera (barbadensis Miller) mucilage in powder form was obtained by spray-drying following by suspension in aqueous solution, to enable microstructure recovery. The rheological behavior of the reconstituted mucilage was evaluated as a function of mucilage concentration, temperature, pH and ionic-strength. Mucilage solutions exhibited sh...
Article
Full-text available
This study is concerned with the modelling of thixotropic and viscoelastoplastic material systems, contrasting two approaches in the development of such constitutive models. Accordingly, departure from Oldroyd-B-like behaviour is engineered through, first, a new micellar viscoelastic–thixotropic model (NM_τ p _ABS), under the Bautista–Manero framew...
Article
The shear thickening behavior of dilute micellar solutions of hexadecyltrimethylammonium-type surfactants with different counterions (tosylate, 3- and 4-fluorobenzoate, vinylbenzoate and salicylate) and of n-alkyltetradecylammonium bromide (CnTAB), with n = 14, 16 and 18, is examined here. These solutions undergo a shear thickening transition due t...
Research
Full-text available
Aloe vera (barbadensis Miller) mucilage in powder form was obtained by spray-drying following by suspension in aqueous solution, to enable microstructure recovery. The rheological behavior of the reconstituted mucilage was evaluated as a function of mucilage concentration, temperature, pH and ionic-strength. Mucilage solutions exhibited shear-thinn...
Article
A mathematical model which predicts the performance of vertical and horizontal wells intersecting fractures is presented. Based on the formulation originally proposed by Guo and Schechter (1997), this model predicts the transient pressure behavior with variable flow-rate both during the increasing pressure stage and in the declining pressure and fl...
Article
In the present work, an analysis is carried out to provide a relationship between the Molecular Weight (Mw) of degraded LDPE films (containing Mn stearate as pro oxidant (MnSt-LDPE) and changes in viscosity, elongation at break (EB %) and carbonyl index (CI) occurring during thermal degradation in the thermophilic phase of the compost process. The...
Patent
Full-text available
The present invention refers to a device that includes piezoelec. transducers that generate ultrasonic weaves and which is located in the base of a rheometer for simultaneously performing rheol. detns. by ultrasound. These rheol. detns. of shear viscosity, complex viscosity, elastic module and viscous module, amongst others, are performed in a simu...
Patent
The present invention refers to a device that includes piezoelec. transducers that generate ultrasonic waves and which is located in the base of a rheometer for simultaneously performing rheol. detns. by ultrasound. These rheol. detns. of shear viscosity, complex viscosity, elastic module and viscous module, amongst others, are performed in a simul...
Patent
Full-text available
La presente invención es acerca del desarrollo de un producto de huevo en polvo con características similares a las del huevo fresco cuando es reconstituido, usando como materia prima huevo comercial y mucílago de nopal como agente de recubrimiento, utilizando la tecnología del secado por aspersión como proceso de deshidratación.
Article
This study is concerned with the numerical modelling of thixotropic and non-thixotropic materials in contraction-expansion flows at high Weissenberg number (We). Thixotropy is represented via a new micellar time-dependent constitutive model for worm-like micellar systems and contrasted against network-based time-independent PTT forms. The work focu...