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The effects of oxidizing gases like O3 and NO2 on the electronic and transport properties of carbon nanotubes (CNT) have recently attracted great interests. In this work, a combined experimental and theoretical study on CNT-based thin... more
The effects of oxidizing gases like O3 and NO2 on the electronic and transport properties of carbon nanotubes (CNT) have recently attracted great interests. In this work, a combined experimental and theoretical study on CNT-based thin films is reported. Ultraviolet Photoelectron ...
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Fil: Martini, Raquel Evangelina. Universidad Nacional de Cordoba; Argentina. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Bahia Blanca. Planta Piloto de Ingenieria Quimica (i); Argentina
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espanolLa tecnica de electrospinning es un metodo eficaz para la produccion de fibras biopolimericas con diametros que van desde varios micrometros hasta unos pocos nanometros. El proceso de electrospinning esta regulado por variables... more
espanolLa tecnica de electrospinning es un metodo eficaz para la produccion de fibras biopolimericas con diametros que van desde varios micrometros hasta unos pocos nanometros. El proceso de electrospinning esta regulado por variables relacionadas con el proceso, como el campo electrico aplicado y el caudal de flujo, asi como por las derivadas del material, entre estas el tipo de biopolimero y su concentracion en la disolucion empleada. Estos parametros afectan a la morfologia y tamano de las fibras obtenidas. En este articulo se comparan fibras de poliacido lactico (PLA) y poli(ɛ-caprolactona) (PCL) obtenidas variando los valores de las diferentes variables con el fin de determinar su influencia en las propiedades finales de las fibras. Por otro lado, la cristalinidad de las fibras es un parametro importante que puede afectar a propiedades mecanicas, velocidad de degradacion, solubilidad y propiedades opticas y electricas EnglishThe electrospinning process is a useful technique to produce biopolymeric fibers with diameters from microns to few nanometers. The electrospinning process is controlled by variables related to the process, such as applied voltage and flow-rate, as well as related to the solution properties, such as the kind of biopolymer and the polymer solution concentration. These parameters strongly affect the fibers morphology and diameter. In this article, the final properties polylactic acid (PLA) and poly(ɛ-caprolactone) (PCL) fibers obtained with different parameter values are compared. In particular, the fiber crystallinity is an important property, which can affect the mechanical properties, the degradation rate, solubility and the optical and electrical properties
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espanolLas resinas epoxidicas pueden ser nanoestructuradas mediante diferentes tipos de copolimeros de bloque con un bloque miscible y otro inmiscible con la resina. El bloque inmiscible del copolimero de bloque puede autoensamblarse... more
espanolLas resinas epoxidicas pueden ser nanoestructuradas mediante diferentes tipos de copolimeros de bloque con un bloque miscible y otro inmiscible con la resina. El bloque inmiscible del copolimero de bloque puede autoensamblarse generando diferentes morfologias de redes termoestables nanoestructurados tales como esferica, hexagonal o lamelar. Redes termoestables nanoestructurados pueden ser utilizadas coma plantillas para dispersar moleculas organicas o nanoparticulas inorganicas dando a la matriz epoxidica nuevas propiedades. EnglishThe epoxy resin can be nanostructured by different kind of block copolymers, in which one of the blocks is partially miscible and the other one is immiscible with the epoxy system. The immiscible block of the block copolymer can microphase separate leading to different morphologies in the thermosetting nanostructured systems such as spherical, hexagonal and lamellar structures. Nanostructured thermosetting systems can act as templates for dispersion of organic molecules or inorganic nanoparticles leading to materials with new properties.
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Abstract This chapter is to explore the utilization of biodegradable nanostructured polymers and their associated physicochemical properties in pharmaceutical application. The main hub of the pharma industry is involved in the development... more
Abstract This chapter is to explore the utilization of biodegradable nanostructured polymers and their associated physicochemical properties in pharmaceutical application. The main hub of the pharma industry is involved in the development of innovative biodegradable and biocompatible polymers that have targeting ability and a predictable release profile of an incorporated active pharmaceutical ingredient or therapeutic agents. Moreover, the pharmaceutical and biological efficiency of the nano-drug delivery system varies with the inherent properties of the polymer. The foremost, important physicochemical properties of biodegradable polymers include molecular weight, hydrophobicity, surface charge, and size. Nevertheless, these properties can be manipulated to modify the kinetics of the delivery system by selecting an optimum polymer (based on physicochemical properties) for a specific purpose.
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Abstract Plastics are the most demanding materials for the food packaging industry due to economical and practical reasons such as their low cost, lightness, easy to handle in integrated production lines, and their higher resistance than... more
Abstract Plastics are the most demanding materials for the food packaging industry due to economical and practical reasons such as their low cost, lightness, easy to handle in integrated production lines, and their higher resistance than other materials. Besides containment and information, the packaging should protect foodstuffs from not only contamination but also the loss of food quality. Despite the many advantages, their inherent permeability is perhaps the foremost drawback that could lead to the loss of some food components and, also, to the transference of gases or moisture from the surrounding to the food. Thus, the barrier properties and the wettability are of fundamental importance for food contact materials. Nanotechnology offers innovative solutions to improve the polymer performance. The addition of nanoparticles allows tuning the polymer barrier properties through a relatively simple approach. This chapter aims to explain the role of nanoparticles on the polymer permeation and diffusion processes focusing on food safety and environmental concerns.
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Abstract The use of nanoparticulate pharmaceutical drug delivery systems to enhance the in vivo effectiveness of drugs is now well established. The development of multifunctional and stimulus-responsive nanoparticles (NPs) is an active... more
Abstract The use of nanoparticulate pharmaceutical drug delivery systems to enhance the in vivo effectiveness of drugs is now well established. The development of multifunctional and stimulus-responsive nanoparticles (NPs) is an active area of current research. Such nanosystems can have long circulation times, target the site of the disease, and enhance the intracellular delivery of a drug. The core shell NPs combine the advantages of a magnetic core and the stimuli-responsive property of the thermosensitive biodegradable polymer shell (e.g., an on-off mechanism responsive to external temperature change). They can also respond to local stimuli that are characteristic of the pathological site by, for example, releasing an entrapped drug or shedding a protective coating, thus facilitating the interaction between drug-loaded nanocarriers and target cells or tissues. In addition, imaging contrast moieties can be attached to these carriers to track their real-time biodistribution and accumulation in target cells or tissues. In this chapter, we highlight recent developments with multifunctional and stimuli-sensitive core-shell NP and their therapeutic potential for diseases including cancer, cardiovascular diseases, and infectious diseases.
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In applications like space satellites, high-energy physics experiments, and nuclear power stations, epoxy structural adhesives are normally used in an ionizing radiation environment. To check the effects of γ-irradiation on room... more
In applications like space satellites, high-energy physics experiments, and nuclear power stations, epoxy structural adhesives are normally used in an ionizing radiation environment. To check the effects of γ-irradiation on room temperature epoxy adhesives, mechanical measurements were undertaken for three different resins up to the dose of 3 MGy. Both dumbbell and single-lap shear tests were performed. To correlate the measured radiation effects on these mechanical properties with the molecular modifications of the resins, outgassing and calorimetric tests were performed on one of the tested adhesives. As a result of these tests, the mechanical modifications were associated with the combination of reticulation, network scission, and production of low-weight molecules due to radiation. Differences in shear and tensile strength behaviors were associated with the presence of the adhesive-adherend interface.
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Materials and methods Uniform and patterned a-C:H films were prepared according to previously described methods (1). Glass cover slips (∅ 13 mm) were used as substrates. Thin films were patterned with three different geometries: uniform,... more
Materials and methods Uniform and patterned a-C:H films were prepared according to previously described methods (1). Glass cover slips (∅ 13 mm) were used as substrates. Thin films were patterned with three different geometries: uniform, grids and grooves. hBM-MSCs were isolated as described (1). hBM-MSCs were plated on glass cover slips, on TCP, a-C:H coated glass cover slips, and nanopatterned substrates at a density of 2 x 103 cells/cm2.
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A mathematical model, able to describe the recrystallization and grain growth in metals, has been developed. Taking into account the classical constitutive equations of the Taylor′s theory, the model involves only two free parameters (the... more
A mathematical model, able to describe the recrystallization and grain growth in metals, has been developed. Taking into account the classical constitutive equations of the Taylor′s theory, the model involves only two free parameters (the dislocation density and the initial number of nuclei). Results from the model are here discussed in comparison with measurements performed on an AISI 304 stainless steel. The predictions of the model are in good agreement with experimental results. As cross check of the model prediction, the independent parameter "dislocation density"was found to properly correlate to the mechanical properties of the steel and to X-ray diffraction measurements,according to Taylor′s and Debye′s relations respectively.
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espanolEn el presente trabajo se estudian diferentes nanocompuestos obtenidos a partir de una matriz de un poliuretano lineal formado por estructuras de copolimeros de bloque de policaprolactona (PCL) y poli(L-acido lactico) (PLLA)... more
espanolEn el presente trabajo se estudian diferentes nanocompuestos obtenidos a partir de una matriz de un poliuretano lineal formado por estructuras de copolimeros de bloque de policaprolactona (PCL) y poli(L-acido lactico) (PLLA) reforzados con grafeno en diferentes proporciones en peso. En particular los nanocompuestos se obtuvieron utilizando tres metodos de procesado diferentes: “solvent casting”, extrusion y polimerizacion “in situ”. La dispersion de grafeno en la matriz polimerica se estudio por microscopia electronica de transmision. Se realizo un estudio del impacto que tienen, tanto los diferentes porcentajes de grafeno como las diferentes rutas de procesado en las propiedades electricas, termicas y mecanicas de los nanocompuestos. Por ultimo se estudio el comportamiento de memoria de forma en las muestras obtenidas mediante polimerizacion "in situ", demostrando que la inclusion del grafeno no deteriora las propiedades de memoria de forma intrinsecas de la matriz EnglishIn the present work different nanocomposites obtained from a linear polyurethane matrix based on blocks of Poly(e-caprolactone) (PCL) and poly(lactic acid) reinforced with graphene are presented. In particular, nanocomposites were obtained by three different processing methods: solvent casting, extrusion and “in situ” polymerization. A study about the effect of the different amounts of graphene as well as the different processing routes has been carried out. Graphene dispersion into the polymer matrix was also studied by transmission microscopy. Finally, the shape memory behavior for the samples prepared by “in situ” polymerization process has been studied, revealing that “in situ” nanocomposite is able to maintain the intrinsic shape memory behavior of the polymeric matrix
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International audienc
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espanolEn este articulo se presentan las nuevas tendencias en disenos y materiales para envases alimentarios. Hoy en dia, los materiales plasticos son los materiales mas demandados por la industria de envasado de alimentos debido a las... more
espanolEn este articulo se presentan las nuevas tendencias en disenos y materiales para envases alimentarios. Hoy en dia, los materiales plasticos son los materiales mas demandados por la industria de envasado de alimentos debido a las numerosas ventajas que presentan como son su ligereza, bajo coste y la posibilidad de adaptar sus propiedades, diseno y tamano a las necesidades del producto. Los envases activos e inteligentes son la nueva generacion de envases alimentarios, en los cuales las tecnologias emergentes del sector aprovechan las posibilidades de interaccion entre los materiales plasticos y los alimentos para disenar envases que no solo contienen, conservan y protegen al alimento, sino que tambien interaccionan con el extendiendo su vida util o informando al consumidor sobre su estado de conservacion. Otra tendencia en la industria del envasado de alimentos es el desarrollo de envases mas sostenibles a partir de plasticos provenientes de fuentes renovables y/o con caracter...