The effects of oxidizing gases like O3 and NO2 on the electronic and transport properties of carb... 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 ...
Fil: Martini, Raquel Evangelina. Universidad Nacional de Cordoba; Argentina. Consejo Nacional de ... more 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
Revista de plásticos modernos: Ciencia y tecnología de polímeros, 2015
espanolLa tecnica de electrospinning es un metodo eficaz para la produccion de fibras biopolimeri... 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
Revista de plásticos modernos: Ciencia y tecnología de polímeros, 2014
espanolLas resinas epoxidicas pueden ser nanoestructuradas mediante diferentes tipos de copolimer... 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.
Abstract This chapter is to explore the utilization of biodegradable nanostructured polymers and ... 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.
Abstract Plastics are the most demanding materials for the food packaging industry due to economi... 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.
Abstract The use of nanoparticulate pharmaceutical drug delivery systems to enhance the in vivo e... 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.
The effects of oxidizing gases like O3 and NO2 on the electronic and transport properties of carb... 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 ...
Fil: Martini, Raquel Evangelina. Universidad Nacional de Cordoba; Argentina. Consejo Nacional de ... more 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
Revista de plásticos modernos: Ciencia y tecnología de polímeros, 2015
espanolLa tecnica de electrospinning es un metodo eficaz para la produccion de fibras biopolimeri... 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
Revista de plásticos modernos: Ciencia y tecnología de polímeros, 2014
espanolLas resinas epoxidicas pueden ser nanoestructuradas mediante diferentes tipos de copolimer... 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.
Abstract This chapter is to explore the utilization of biodegradable nanostructured polymers and ... 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.
Abstract Plastics are the most demanding materials for the food packaging industry due to economi... 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.
Abstract The use of nanoparticulate pharmaceutical drug delivery systems to enhance the in vivo e... 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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