Person: Sánchez Salvador, José Luis
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First Name
José Luis
Last Name
Sánchez Salvador
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Químicas
Department
Ingeniería Química y de Materiales
Area
Identifiers
6 results
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Now showing 1 - 6 of 6
Item Comparison Of Mechanical And Chemical Nanocellulose As Additives To Reinforce Recycled Cardboard(Scientific Reports, 2020) Sánchez Salvador, José Luis; Balea Martín, Ana; Monte Lara, M. Concepción; Negro Álvarez, Carlos Manuel; Miller, Meaghan; Olson, James; Blanco Suárez, ÁngelesRecycling cycles cause a decrease in mechanical paper properties due to cellulose fiber degradation. The use of cellulose micro/nanofibers (CMF/CNF) to reinforce paper strength has been well studied, although it has been found to have negative effects on drainage. However, the application of CMF/CNF as paper reinforcement is affected by the nanocellulose type. Thus in this study mechanical and chemical treatments in CNF production were compared. Old corrugated container (OCC) pulp used to produce recycled cartonboard was reinforced with 1) CMF from never-dried northern bleached softwood kraft pulp (NBSK) highly refined in a 16-inch low consistency refiner at 1200 rpm and 25 kW of net power; and 2) CNF from NBSK pulp treated by TEMPO-mediated oxidation and homogenization at 600 bars. CMF/CNF and OCC were pulped at the same time and handsheets formed with cationic starch (CS) as retention system. Mechanical, drainage and flocculation properties were evaluated and compared. Data were also compared with other sources of TEMPO CNF. Results show an improvement in mechanical properties, drainage and flocculation when OCC is reinforced with CMF obtained with LCR. Therefore, high fibrillation was not necessary to improve mechanical paper or cardboard properties.Item Enhanced Morphological Characterization of Cellulose Nano/Microfibers through Image Skeleton Analysis(Nanomaterials, 2021) Sánchez Salvador, José Luis; Campano Tiedra, Cristina; López Expósito, Patricio; Tarrés, Quim; Mutjé, Pere; Delgado Aguilar, Marc; Monte Lara, M. Concepción; Blanco Suárez, ÁngelesThe present paper proposes a novel approach for the morphological characterization of cellulose nano and microfibers suspensions (CMF/CNFs) based on the analysis of eroded CMF/CNF microscopy images. This approach offers a detailed morphological characterization and quantification of the micro and nanofibers networks present in the product, which allows the mode of fibrillation associated to the different CMF/CNF extraction conditions to be discerned. This information is needed to control CMF/CNF quality during industrial production. Five cellulose raw materials, from wood and non-wood sources, were subjected to mechanical, enzymatic, and (2,2,6,6-Tetramethylpiperidin-1-yl)oxyl (TEMPO)-mediated oxidative pre-treatments followed by different homogenization sequences to obtain products of different morphologies. Skeleton analysis of microscopy images provided in-depth morphological information of CMF/CNFs that, complemented with aspect ratio information, estimated from gel point data, allowed the quantification of: (i) fibers peeling after mechanical pretreatment; (ii) fibers shortening induced by enzymes, and (iii) CMF/CNF entanglement from TEMPO-mediated oxidation. Being mostly based on optical microscopy and image analysis, the present method is easy to implement at industrial scale as a tool to monitor and control CMF/CNF quality and homogeneity.Item Simplification of gel point characterization of cellulose nano and microfiber suspensions(Cellulose, 2021) Sánchez Salvador, José Luis; Monte Lara, M. Concepción; Negro Álvarez, Carlos Manuel; Batchelor, Warren; Garnier, Gil; Blanco Suárez, ÁngelesNanocellulose is an emerging material that needs to be well characterized to control its performance during industrial applications. Gel point (Øg) is a convenient parameter commonly used to estimate the aspect ratio (AR) of cellulose nano/microfibers (CNFs/CMFs), providing critical information on the nanofiber network. However, its estimation requires many sedimentation experiments, tedious and time consuming. In this study, a simpler and faster technique is presented to estimate Øg, based on one or two sedimentation experiments, reducing the experiments by a factor of at least 2.5. Here, this new methodology is successfully validated by using the Øg of different CNF/CMF hydrogels calculated with the traditional methodology, showing an error lower than 7%. The error in the estimation of the AR is lower than 3% in all cases. Furthermore, the two mathematical models currently used to estimate Øg, the smoothing spline and the quadratic fit, are compared and the mathematical assumptions improved.- Project number: 290
Item Desarrollo y aplicación de una metodología innovadora para realizar visitas técnicas virtuales a empresas y centros de investigación() Blanco Suárez, Ángeles; Balea Martín, Ana; Monte Lara, M. Concepción; Negro Álvarez, Carlos; de la Fuente González, Elena; Hierro Paredes, Eva; Romero De Ávila Hidalgo, María Dolores; Tijero Cruz, Antonio; Plaza Rodriguez, Jesus; Sánchez Salvador, José Luis; Ojembarrena Jiménez, Francisco de Borja; Xu, Hongyu; Gascó Guerrero, Antonio María; Márquez Negro, Alejandro; Hermosilla Redondo, Daphne; Aguado García, Sofía; Alarcón Mondéjar, Juan Ignacio; González Seade, Sofía; Sánchez Calatayud, TaniaEl objetivo del proyecto es desarrollar una metodología innovadora para realizar visitas técnicas virtuales a plantas industriales y/o centros de investigación con alumnos que podrán utilizarse en 8 asignaturas de 4 grados y 2 másteres de la UCM. Item Pickering Emulsions Containing Cellulose Microfibers Produced by Mechanical Treatments as Stabilizer in the Food Industry(Applied Sciences, 2019) Sánchez Salvador, José Luis; Balea Martín, Ana; Monte Lara, M. Concepción; Blanco Suárez, Ángeles; Negro Álvarez, Carlos ManuelPickering emulsions are emulsions stabilized by solid particles, which generally provide a more stable system than traditional surfactants. Among various solid stabilizers, bio-based particles from renewable resources, such as micro- and nanofibrillated cellulose, may open up new opportunities for the future of Pickering emulsions owing to their properties of nanosize, biodegradability, biocompatibility, and renewability. The aim of this research was to obtain oil-in water (O/W) Pickering emulsions using cellulose microfibers (CMF) produced from cotton cellulose linters by mechanical treatment through a high-pressure homogenizer. The O/W Pickering emulsions were prepared with different O/W ratios by mixing edible oil (sunflower oil) with water containing CMF at concentrations of up to 1.0 wt%. The apparent viscosity of the separated emulsion phase was measured. Results showed the feasibility of using low concentration of CMF for preparing and stabilizing Pickering emulsions, with the apparent viscosity of the emulsion phase increasing 60–90 times with respect to the sunflower oil, for a shear rate of 1 s−1 . In addition, theoretical nutrition facts of the emulsions were calculated and compared with other fats used in foods, showing that they can be a promising low-calorie product containing dietary fiber, replacing trans and saturated fats in foods.- Project number: 100
Item Transformación de prácticas de laboratorio a modalidad no presencial: desarrollo de una metodología más allá de la simulación(2021) Monte Lara, M. Concepción; Negro Álvarez, Carlos Manuel; Blanco Suárez, Ángeles; Fuente González, Elena de la; Balea Martín, Ana; Tijero Cruz, Antonio; Hierro Paredes, Eva; Romero De Ávila Hidalgo, María Dolores; Ojembarrena Jiménez, Francisco de Borja; Sánchez Salvador, José Luis; Tejera Tejo, Javier; Campano Tiedra, Cristina; Plaza Rodriguez, Jesus; Gascó Guerrero, Antonio María; Hermosilla Redondo, Daphne; Merayo Cuevas, Noemí; Ocaña Martín, Marta; Sicilia Domínguez, Lucía; Gil, LoanaDesarrollo de una metodología para trasformar las prácticas de laboratorio presenciales en prácticas virtuales para mejorar la docencia presencial, complementando las prácticas presenciales, y resolver el problema actual de la pandemia.