Papers by Vera A. Alvarez
Pectin-based inks development for 3D bioprinting of scaffolds
Journal of Polymer Research
Hydrogels for extrusion-based bioprinting: General considerations
Bioprinting
Handbook of Nanomaterials and Nanocomposites for Energy and Environmental Applications, 2020
Wastes from polymeric materials could be considered as resources to manufacture new products by r... more Wastes from polymeric materials could be considered as resources to manufacture new products by recycling. The properties of the as-obtained materials should be comparable to those of the virgin fossil-based plastics and also biopolymers. Several strategies are useful to achieve the required properties in order to introduce the recycled products into the market having competitive performance. Scientific knowledge related to different aspects of polymeric materials is a relevant tool to assure the performance of recycled products for new applications. Diverse strategies, able to upgrade the morphology and the properties of recycled
GESTIÓN DE UN PROYECTO DE I+D+i EN EL ÁREA DE NANOTECNOLOGÍA
Iberoamerican Journal of Project Management, 2014
El proyecto tiene como objetivo general el desarrollo de cadenas de valor que se sustenten en la ... more El proyecto tiene como objetivo general el desarrollo de cadenas de valor que se sustenten en la comercializacion de productos formulados a partir de materiales de alto valor agregado basados en matrices polimericas, mediante el agregado de NANO-ARCILLAS modificadas incluyendo las etapas de laboratorio, escala piloto y pre-comercial. En el proyecto interactuan el sector industrial, el ambito academico y el estado a traves de sus areas de fomento al desarrollo cientifico tecnologico. Si bien en la etapa inicial se utilizo la metodologia clasica de Gestion de Proyectos siguiendo los lineamientos del PMBOK surgio la necesidad de aplicar otra metodologia complementaria para el trabajo diario. Los proyectos de I+D+i piden basicamente rapidez y calidad, pero para asumir estos retos, es necesario tener agilidad y flexibilidad. Para ello se implemento la metodologia agil SCRUM. La misma esta basada en un proceso constructivo iterativo e incremental donde las iteraciones tienen duracion fija...
Thermal and Mechanical Properties of Polycaprolactone-Soy Lecithin Modified Bentonite Nanocomposites
World Academy of Science, Engineering and Technology, International Journal of Materials and Metallurgical Engineering, 2016
RESULTADOS PRELIMINARES Y EXPECTATIVAS FUTURAS En la primera etapa del proyecto se formularon b... more RESULTADOS PRELIMINARES Y EXPECTATIVAS FUTURAS En la primera etapa del proyecto se formularon biotintas de pectina y celulosa (biopolímeros) para ser inyectados mediante bioimpresión 3D. Se obtuvieron andamios 3D rectangulares, circulares y parabólicos. Están siendo realizadas pruebas con nanopartículas (NPs) metálicas de plata, oro y cobre para evaluar la posibilidad de ser adicionadas a las biotintas. En etapas próximas se espera caracterizar los biomateriales analizando: estabilidad fisicoquímica, biocompatibilidad, análisis biofísicos, potencial de curación de heridas, entre otros estudios. Licencia Creative Commons Atribución-CompartirIgual 4.0 Internacional
Hydrogels Beads of Alginate/Seaweed Powder for Plants Nutrition
World Academy of Science, Engineering and Technology, International Journal of Materials and Metallurgical Engineering, 2016
Nanotechnology Applied to Personalized 3D Dressings for Diabetic Feet
Handbook of Consumer Nanoproducts, 2021
Phantom gels towards medicine improvement: uses for magnetic device tests and enhancements on magnetic-dependent clinical techniques
Materials for Biomedical Engineering, 2019
Abstract A phantom is an especially designed material that should respond similarly to the desire... more Abstract A phantom is an especially designed material that should respond similarly to the desired human organ/tissue. Biomedical phantoms have a broad set of applications, from uses for magnetic device tests and enhancement of magnetic-dependent clinical techniques, to medical student training and complex surgery planning. Among the magnetic devices that could be tested are embolic particles, materials useful for hyperthermia treatments, and others employed in magnetofection therapy. These magnetic therapies are considered potential key solutions in malignant tumor and cancer treatments due to their relatively simple implementation and reduced secondary undesired effects. In this sense, the possibility to test novel magnetic devices on phantoms simulating real human organs/tissues opens up a vast area of possibilities. Magnetic resonance imaging, commonly known as MRI, is a useful diagnostic tool broadly applied for clinical diagnostic and scientific research. Certain phantoms could be used to study how to enhance MRI quality, increasing signal-to-noise-ratio. Taking into account the importance of ensuring the correct reproduction of the specific property or group of properties, such as morphological, mechanical, electric, and/or electromagnetic intrinsic characteristics of the human organ/tissue, selecting the appropriate materials and techniques is a real challenge. Many polymeric gels have been suggested as convenient materials capable of producing phantoms simulating thermal and mechanical behavior, and also permeability properties of human organs/tissues.
European Journal of Plant Pathology, 2020
Your article is protected by copyright and all rights are held exclusively by Koninklijke Nederla... more Your article is protected by copyright and all rights are held exclusively by Koninklijke Nederlandse Planteziektenkundige Vereniging. This e-offprint is for personal use only and shall not be self-archived in electronic repositories. If you wish to self-archive your article, please use the accepted manuscript version for posting on your own website. You may further deposit the accepted manuscript version in any repository, provided it is only made publicly available 12 months after official publication or later and provided acknowledgement is given to the original source of publication and a link is inserted to the published article on Springer's website. The link must be accompanied by the following text: "The final publication is available at link.springer.com".
Applied Clay Science, 2018
Bentonite (Bent) clay is a component of soil with useful properties for enzyme adsorption. In thi... more Bentonite (Bent) clay is a component of soil with useful properties for enzyme adsorption. In this work, the previously characterized antioxidant superoxide dismutase (SOD) enzyme named wGLP by wheat germin-like protein was immobilized in raw (Bent) and modified bentonites (Bent-DDA). The physicochemical characterizations of both supports were carried out. Successful adsorption of wGLP onto Bent and Bent-DDA occurred on the surface and within the interlayer spacing as was revealed by X-Ray Diffraction (XRD) and Thermogravimetric Analysis (TGA). The release of wGLP at different times and pHs was tested. While wGLP remained almost totally immobilized into Bent-DDA up to 96 h, it was released from Bent to reach nearly 60% after 72 h at pH 7.5 and preserving its SOD activity. Since tomato cell viability under the presence of Bent-wGLP was maintained, Bent-wGLP complexes are potential carriers of antioxidants in tomato cell suspension cultures.
Non-isothermal crystallization of PCL/CLAY nanocomposites
Advanced Materials Letters, 2018
Fil: Lanfranconi, Matias R.. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro C... more Fil: Lanfranconi, Matias R.. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnologia de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingenieria. Instituto de Investigaciones en Ciencia y Tecnologia de Materiales; Argentina
International Journal of Advances in Medical Biotechnology - IJAMB, 2020
Three-dimensional bioprinting is a new technology that should be integrated into several areas, i... more Three-dimensional bioprinting is a new technology that should be integrated into several areas, including medical technology. However, before designing and applying it on a large scale, several biophysical parameters and particularly printability need to be established. In the present work, general characteristics of the extrusion method, bioinks, and scaffolds are reviewed. Printability analysis of 3D bioprinting is also included.
Advanced Materials Letters, 2018
In this work, biodegradable nanocomposites based on polycaprolactone (PCL) reinforced with 2.5, 5... more In this work, biodegradable nanocomposites based on polycaprolactone (PCL) reinforced with 2.5, 5.0 and 7.5 wt.% of two different clays, a commercial organo-clay (Cloisite 20A, C20A) and a laboratory modified bentonite with tributylhexadecyl phosphonium bromide (bTBHP), were prepared by melt intercalation followed by compression molding. The study contemplates the analysis of chemical (Infrared Spectrometry, FTIR), morphological (X-Ray Diffractometry, XRD, Scanning Electron Microscopy, SEM, and Transmission Electron Microscopy, TEM), rheological, thermal (Differential Scanning Calorimetry, DSC, and Thermogravimetrical Analysis, TGA) and mechanical properties (tensile tests), which are important properties for packaging applications. In previous works, we concluded that higher clay dispersion degree inside the PCL matrix is expected when clays with large interlayer distance, strong hydrophobicity and strong processing stability are used. In the present work the opposite result was obtained. Although the phosphonium treated clay (bTBHP) showed the largest interlayer distance (d001), strongest hydrophobicity and the best processing stability, the clay dispersion degree inside PCL was worse than in the case of the alkylammonium treated clay (C20A). PCL/bTBHP nanocomposites showed weaker mechanical properties in comparison with PCL/C20A ones, which is in accordance with the morphological analysis. On the other hand, the thermal properties of the matrix were not substantially affected by clay incorporation in both nanocomposites. Copyright
Polymers and Polymer Composites, 2016
In this work, poly(lactic acid) (PLA)/cellulose-nanowhisker (CNW) nanocomposites were prepared by... more In this work, poly(lactic acid) (PLA)/cellulose-nanowhisker (CNW) nanocomposites were prepared by twin-screw extrusion followed by injection moulding. The CNW was dispersed in a plasticizer/compatibilizer (PL) before the melt mixing process. It was found that the PL not only improved the processability and reduced the fragility of PLA but also prevented the agglomeration of the CNW up to 12 wt.% of CNW content, obtaining well dispersed and distributed PLA/CNW nanocomposites. The prepared nanocomposites were injection-moulded and their mechanical/thermal properties were evaluated. PLA/CNW nanocomposites showed better mechanical properties than those of the neat matrix but the material with the lower CNW content showed the best mechanical performance.
Colloids and Surfaces B: Biointerfaces, 2018
High CBZ encapsulation in lipidic nanoparticles was achieved. Nanoparticles showed optimum pa... more High CBZ encapsulation in lipidic nanoparticles was achieved. Nanoparticles showed optimum particle size distribution and high stability. All formulations exhibited controlled release profiles of CBZ for 24 hours. An enhanced CBZ permeability through cell monolayer was observed. A neuroprotective effect in time was achieved in animal models.
Hybrid bacterial cellulose–pectin films for delivery of bioactive molecules
New Journal of Chemistry, 2018
Novel biopolymeric films based on bacterial cellulose (BC) modified with high methoxylated pectin... more Novel biopolymeric films based on bacterial cellulose (BC) modified with high methoxylated pectin (HMP) were developed for drug delivery.
Journal of Environmental Management, 2018
Iron nanoparticles can be incorporated on the structure of natural clays to obtain magnetic clays... more Iron nanoparticles can be incorporated on the structure of natural clays to obtain magnetic clays, an adsorbent that be easily removed from a wastewater by magnetic means. Magnetic clays have high adsorption capacities of different contaminants such as heavy metals, fungicides, aromatic compounds and colorants and show rapid adsorption kinetics, but crucial data for achieving its full or pilot scale application is still lacking. In this work, magnetic bentonites with different amounts of magnetite (iron fractions on the clay of 0.55, 0.6 and 0.6) were used to remove color from a real textile wastewater. On a first stage the optimal conditions for the adsorption of the dye, including pH, temperature and clay dosage were determined. Also design parameters for the separation process such as residence time, distance from magnet to magnetic clay and magnet strength were obtained. Finally a pilot scale magnetic drum separator was constructed and tested. A removal of 60% of the dye from a wastewater that contained more than 250 ppm of azo dye was achieved with only 10 min of residence time inside the separator.
Journal of Polymers and the Environment, 2017
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Papers by Vera A. Alvarez