Manuel J Lis

Universitat Politecnica de Catalunya, Chemical Engineering, Faculty Member

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Chemical Engineer, Master in Engineering and PhD on Mass and Energy Transport in Polymers Teaching Chemical Engineering since 1984. ESEIAAT.UPCMember of INTEXTER. UPCResearch Group POLQUITEX. Focussed on the physico-chemical aspects on Drug-Delivery Systems based on polymeric structuresHead of Surfactants and Detergency Laboratory at INTEXTER-UPC

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Papers by Manuel J Lis

Soil biostabilisation and interaction with compaction processes for earthen engineering structures production

Materiales De Construccion, Aug 17, 2021

Interaction between microbially induced calcium carbonate precipitation (MICP) and compaction pro... more Interaction between microbially induced calcium carbonate precipitation (MICP) and compaction procedures to stabilise raw soil materials has been studied with the aim of producing earthen engineering structures. Initial tests to optimise MICP in aqueous medium and in selected soils were performed. MICP and compaction were finally applied to assess mediumsize elements. The main result was that sandy soils should be compacted before irrigation treatment to close the existing voids and prevent bacterial sweeping, whereas clayey soils should be compacted after irrigation treatment to avoid the plugging effect. MICP improved small sand soil compressive strength by up to 32% over the value reached by compaction alone. However, MICP had no positive effect on coarse soils and soils with an optimum particle size distribution: MICP treatment was not able to fill large connected voids in the first case and it caused little void generation due to bacteria sporulation in the second.

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Microencapsulation of Essential oils with biopolymers

Fire performances comparison of cotton fabrics incorporated with ZIF-8 and UIO-66-COOH

Fire Performance of Cotton Fabrics Coated with 10-(2,5-Dihydroxyphenyl)-9,10-dihydro-9-xa-10-phosphaphenanthrene-10-oxide (DOPO-HQ) Zr-Based Metal-Organic Frameworks

Polymers

We investigated the performance of cotton fabrics coated with DOPO-HQ and Zr-based Metal–organic ... more We investigated the performance of cotton fabrics coated with DOPO-HQ and Zr-based Metal–organic Frameworks when exposed to fire. The chemical structure of the cotton fabrics before and after the coating was characterized using FTIR spectroscopy, and the surface morphology of cotton and their combustion residues was probed via scanning electron microscopy. In our experiments, we used flammability tests and thermogravimetric methods to understand the burning behavior of the coated fibers, as well as their thermal stability. The cotton fabrics coated with DOPO-HQ and Zr MOFs exhibited shorter combustion times, had better thermal degradation properties, promoted the creation of heat-insulating layers, and exhibited improved smoke suppression behavior.

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ABSORCIÓN DE COLORANTES DIRECTOS SOBRE FIBRAS DE LYOCELL

by J. Valldeperas and Manuel J Lis

La reciente aparición de la fibra lyocell ofrece las ventajas de un proceso de fabricación menos ... more La reciente aparición de la fibra lyocell ofrece las ventajas de un proceso de fabricación menos contaminante que el de viscosa convencional, mejorando las propiedades de resistencia y tenacidad en húmedo. El comportamiento de la fibra lyocell frente a la absorción de colorantes directos adquiere especial importancia en la etapa de tintura correspondiente, durante el procesado químico-industrial de esta fibra.

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Determinación de la permeabilidad de films de polietileno de baja densidad mediante la técnica electroquímica cronoamperométrica. Efecto de la temperatura

Afinidad, 2001

Kinetic and Diffusional Approach to the Dyeing Behavior of the Polyester PTT

Textile Research Journal, 2007

The textile fiber made of poly(trimethylene terephthalate) came onto the market a few years ago. ... more The textile fiber made of poly(trimethylene terephthalate) came onto the market a few years ago. This fiber has certain advantages over traditional polyester, especially its greater elasticity and the fact that it can be dyed at lower temperatures. Here we study the dyeing kinetics of this “new” fiber using an azo disperse dye, C.I. Disperse Red 82, observing that the dyeing rate increases with temperature and that dyebath exhaustions only reach acceptable levels at temperatures above 80 °C. In order to quantify and compare the experimental data obtained, three kinetics models have been chosen. To fit results with models, non-linear regression methods have been applied and, to differentiate between early and final stages, two levels of exhaustion have been checked. From results obtained with the Chrastil model, apparent diffusion coefficients and the activation energy of diffusion have been calculated.

Cineticas de tintura en banos de reutilizacion directa: microfibras de poliester con colorantes dispersos

Revista de química textil, 2004

Degradación oxidativa de perfiles de PVC destinados a la fabricación de marcos de ventana inducidos por tratamiento mediante inmersión en ácido nítrico

Drug release system of ibuprofen in PCL-microspheres

Colloid and Polymer Science, 2012

Today, the technology of microencapsulation of active principles is on top of biomedical advances... more Today, the technology of microencapsulation of active principles is on top of biomedical advances, because through it we can solve many of the problems caused by current methods of taking medication. Active principle microencapsulation not only solves the problems of drug intake but also controls its dosage. In this study was carried out the development of a protocol for the microencapsulation of ibuprofen by solvent evaporation method. A subsequent application of those microencapsulates to biofunctional textile substrates (cotton, polyamide, acrylic, and polyester) using a finishing process, and finally a study of the release of active principle in two different media (deionized water and physiological serum) has been carried out using samples of the treated fabrics that were submerged into a thermostatized vessel at semi-infinite bath conditions. The determination of active principles released to the bath was determined by a UV spectrophotometer. These experimental results have been analyzed and evaluated, and have therefore allowed to define a controlled drug release system by Fickian diffusion in different media.

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Skin penetration and antioxidant effect of cosmeto-textiles with gallic acid

Journal of photochemistry and photobiology. B, Biology, 2016

In this work, the antioxidant gallic acid (GA) has been encapsulated in microspheres prepared wit... more In this work, the antioxidant gallic acid (GA) has been encapsulated in microspheres prepared with poly-ε-caprolactone (PCL) and incorporated into polyamide (PA) obtaining the cosmeto-textile. The topical application of the cosmeto-textile provides a reservoir effect in the skin delivery of GA. The close contact of the cosmeto-textile, containing microsphere-encapsulated GA (ME-GA), with the skin and their corresponding occlusion, may be the main reasons that explain the crossing of active principle (GA) through the skin barrier, located in the stratum corneum, and its penetration into the different compartments of the skin, epidermis and dermis. An ex vivo assessment was performed to evaluate the antioxidant effect of the ME-GA on the stratum corneum (SC) using the thiobarbituric acid-reactive species (TBARS) test. The test is based on a non-invasive ex vivo methodology that evaluates lipid peroxides formed in the outermost layers of the SC from human volunteers after UV radiation ...

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Formation and Characterization of Oregano Essential Oil Nanocapsules Applied onto Polyester Textile

Polymers

Oregano essential oil was encapsulated in poly-ϵ-caprolactone nanoparticles by a nanoprecipitatio... more Oregano essential oil was encapsulated in poly-ϵ-caprolactone nanoparticles by a nanoprecipitation method using glycerin as a moisturizer. Nanocapsule characterization was performed by measuring the particle size, colloidal stability and encapsulation efficiency using dynamic light scattering, UV–Vis spectrophotometry and scanning electron microscopy (SEM). The nanoparticles had a mean particle size of 235 nm with a monomodal distribution. In addition, a low polydispersity index was obtained, as well as a negative zeta potential of −36.3 mV and an encapsulation efficiency of 75.54%. Nanocapsules were applied to polyester textiles through bath exhaustion and foulard processing. Citric acid and a resin were applied as crosslinking agents to improve the nanocapsules’ adhesion to the fabric. The adsorption, desorption, moisture content and essential oil extraction were evaluated to determine the affinity between the nanocapsules and the polyester. The adsorption was higher when the citr...

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Absorción de colorantes directos sobre fibras de lyocell

by Manuel J Lis and José Morell

Skin Delivery of Gallic Acid from Cosmeto-Textiles: Cotton/ Polyamide Fabrics

Cellulase processing of lyocell and viscose type fibres: kinetics parameters

Process Biochemistry, 2003

Differences in hydrolysis behaviour between lyocell and viscose type regenerated celluloses (visc... more Differences in hydrolysis behaviour between lyocell and viscose type regenerated celluloses (viscose and modal) have been evaluated by the study of the enzymic hydrolysis by cellulases. Kinetic parameters (Vem and ke) and enzyme catalytic specificity were calculated during cellulase processing. The results show low adsorption, catalytic specificity and rate of hydrolysis (Vem=0.407 h/l h) of lyocell fibres ahead of the

Barrier Effects of Cellulosic Fibers with Hybrid Coating Based on Zirconium Metal-Organic Framework

Polymers

Metal-organic frameworks (MOFs) have great potential for the development of fire barriers for fla... more Metal-organic frameworks (MOFs) have great potential for the development of fire barriers for flammable materials. Accordingly, zirconium-based metal-organic framework (Zr-MOF), branched polyethyleneimine (BPEI), and vinyltriethoxysilane (VTES) were deposited to produce composites assembled on cellulosic fibers to investigate their barrier effects. The structure, morphology, and thermal properties of the cellulosic fibers were characterized using FTIR spectroscopy, SEM, and TGA. Compared with the untreated cotton sample, the temperature of the maximum rate of weight loss (Tmax) of C-Zr-MOF/BPEI/VTES increased from 479 to 523.3 °C and the maximum weight loss rate (Rmax) at Tmax decreased from 37.6 to 17.2 wt%/min. At 800 °C, the pristine cotton was burned out without residues whereas the residual char content of the C-Zr-MOF/BPEI/VTES sample was 7.2355 wt%. From the vertical burning tests, the results suggested that the C-Zr-MOF/BPEI/VTES sample had better barrier effects by reducing...

format_quoteHybrid coatings of Zr-MOF, BPEI, and VTES enhanced fire performance of cotton fabrics remarkably compared to untreated samples.format_quote

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Permeación en piel de ácido gálico desde un cossmeto-textil: tejidos de algodón y poliamida

Efectos Del Mercerizado en Las Propiedades Mecánicas De Hilos De Fibras Celulósicas Regeneradas Obtenidas Por Hilatura en Óxido De N-Metilmorfolina

RESUMEN El mercerizado es uno de los tratamientos más importantes que se realizan sobre las fibra... more RESUMEN El mercerizado es uno de los tratamientos más importantes que se realizan sobre las fibras celulósicas, para mejorar las propiedades de estabilidad dimensional y accesibilidad. El objetivo del trabajo es el de estudiar el efecto que produce el tratamiento de mercerizado, con diferentes concentraciones de hidróxido sódico, sobre las propiedades mecánicas de tracción (alargamiento, módulo de Young, tenacidad y trabajo de rotura) de muestras de hilo compuesto por fibras obtenidas por hilatura en óxido de N-metilmorfolina (NMMO), las cuales se denominan genéricamente lyocell. Los resultados experimentales indican que se produce una disminución progresiva de las propiedades mecánicas hasta una concentración 4,18 M de NaOH, manteniéndose constante el comportamiento a partir de este valor. Esta modificación en el comportamiento es consecuencia de los cambios estructurales y de cristalinidad producidos en la fibra. Palabras clave Lyocell, propiedades mecánicas, mercerizado. 1. INTRO...

Absorción de colorantes directos sobre fibras de lyocell

La récente apparition de cette fibre présente les avantages d’un procédé de fabrication moins pol... more La récente apparition de cette fibre présente les avantages d’un procédé de fabrication moins polluant que celui de la viscose conventionnelle, tout en améliorant les propriétés de résistance et de ténacité en milieu humide. Le comportement de la fibre lyocell par rapport à l’absorption de colorants directs revêt une certaine importance dans la phase de teinture correspondante, pendant le traitement chimique et industriel de cette fibre. L’étude vise à caractériser les paramètres influents dans le processus d’absorption de colorants directs sur les fibres de lyocell, à partir de l’analyse des isothermes d’absorption dans l’équilibre du colorant C.I. Direct Blue 1. A partir des résultats expérimentaux, nous avons déterminé les équations d’équilibre pour l’interprétation du comportement du système en faisant une analyse comparative des équations proposées par Nernst, Freundlich et Langmuir et nous avons calculé le volume libre interne caractéristique de la fibre lyocell, V(l/kg). Nous...

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4B1_0561_ Microencapsulation of C.I. Reactive Orange 122 via Solvent Evaporation

Proceedings of the 19th World Textile Conference - Autex 2019, Jul 10, 2019

Manuel J Lis

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