Browsing by Author "Mata, Vera G."
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- Characterization and evaluation of commercial fragrance microcapsules for textile applicationPublication . Rodrigues, Carla Sofia; Martins, Isabel M.; Mata, Vera G.; Barreiro, M.F.; Rodrigues, AlírioIn this paper, some commercial microcapsule samples, containing different fragrances used for textile application purposes, were characterized and evaluated. Microcapsule samples were evaluated in terms of particle size, morphology, shell material composition, and fragrance intensity. The effectiveness of the textile impregnation and its durability were assessed. The selection of samples used in each study was made in order to the specific goals of characterization and evaluation of microcapsules. Lemon_Bayer, Lemon_Focor, Lemon_Horquim, Strawberry_Horquim, and Jasmine_Focor samples were used to study the morphology and particle size distribution, and it was observed that microcapsules have a spherical shape with size between 2 and 6 lm. The chemical composition of Lavender_Horquim, Mints_Horquim, Eucaliptus_Focor, and Apple_Focor samples was checked/ confirmed and was based on melamine copolymers including melamine-formaldehyde ones. Lemon_Horquim microcapsules were impregnated on textile substrates, and it was observed that a loss of 46% of limonene occurred after one domestic wash and a loss of 97% occurred after 20 domestic washes.
- Flow and mass transferPublication . Rodrigues, Alírio; Mata, Vera G.; Zabka, Michal; Pais, Luís S.In the last decade, a growing interest in large-pore, permeable, or flow-through particles for engineering applications as catalysts supports, adsorbents, HPLC packings, ceramic membranes, supports for mammalian cell culture/biomass growth, and building materials can be observed. In particular in the area of separation engineering, perfusion chromatography appeared as a key technique for separation of proteins.
- Fractionation of multicomponent sugar mixtures using a pseudo simulated moving bedPublication . Mata, Vera G.; Pais, Luís S.; Azevedo, Diana C.S.; Rodrigues, AlírioA model for the fractionation of a ternary mixture of sugars by pseudo-simulated moving bed chromatography, according to the JO process of Japan Organo Co., is presented. This methodology is applied to the separation of a ternary mixture constituted by two sugars – sucrose (disaccharide) and fructose (monosaccharide) – and one non-sugar – betaine.
- Microencapsulation of limonen oil for textile applicationPublication . Rodrigues, Sofia Nogueira; Fernandes, Isabel P.; Mata, Vera G.; Barreiro, M.F.; Rodrigues, AlírioThe production of polyurethane-urea microcapsules using the interfacial polymerization technology was performed. Microcapsules were produced in a basic IKA® Miniplant laboratory reactor, in order to produce microcapsules with controlled parameters. In this formulation, limonene, a fragrant chemical characteristic of the lemon oil - was microencapsulated, because lemon oil is the most used oil in perfumery. It resulted in microcapsules with bimodal distribution and average size equal to 10µm. The characterisation of the microcapsules includes particle size distribution, optical microscopy and scanning electron microscopy. Using scanning electron microscopy it is visible the presence of well defined microcapsules on the woven.
- Microencapsulation of limonene for textile applicationPublication . Rodrigues, Sofia Nogueira; Fernandes, Isabel P.; Martins, Isabel M.; Mata, Vera G.; Barreiro, M.F.; Rodrigues, AlírioPolyurethane−urea microcapsules with limonene oil as the active agent were produced by interfacial polymerization, and their suitability for textile applications was studied. Experimental conditions for the textile substrates impregnation were based on industrial requirements and set up at laboratory scale using a mini-foulard. The success of the polymerization reaction leading to the formation of the polyurethane−urea shell was checked by Fourier transform infrared spectroscopy. Particle size distributions and morphology of the microcapsules were studied using a particle size analyzer (Coulter LS230), optical microscopy, and scanning electron microscopy. The effectiveness of the textiles impregnation and the durability of the impregnation effect were evaluated by scanning electron microscopy and by headspace/GC/FID. Under the present research, a product was developed and its performance, in regard to industrial requirements, was successfully tested.
- Scentfashion®: Microencapsulated perfumes for textile applicationPublication . Rodrigues, Sofia Nogueira; Martins, Isabel M.; Fernandes, Isabel P.; Gomes, P.B.; Mata, Vera G.; Barreiro, M.F.; Rodrigues, AlírioThis work is a contribution to the introduction of emergent technologies in the textile sector, namely the microencapsulation of fragrances and its application to obtain added-value products. Interfacial polymerization was used to produce polyurethane/urea (PUU) microcapsules with a perfume for industrial application on textile substrate having in view man suits production. The extent of reaction of PUU microcapsules formation was followed by Fourier transform infrared spectroscopy. Size distribution and morphology of the produced microcapsules were studied using particle size analysis, optical microscopy and scanning electron microscopy. Impregnation on textile substrates was tested both at laboratory level and at industrial scale. The fragrance release from textile substrates was measured with headspace chromatography. The content of microcapsules was released with light abrasion to simulate day-to-day wear, and fabrics impregnated at laboratory scale have survived to 9000 abrasion cycles. Microcapsules have continued to release aroma up to five dry cleaning washing cycles.
- Simulated moving bed and related techniquesPublication . Pais, Luís S.; Mata, Vera G.; Rodrigues, AlírioIn the last 12 years, Simulated Moving Bed (SMB) technology has received considerable attention in both academic and industrial fields. The objective of this chapter is to introduce the SMB concept and to present the modeling strategies to simulate and to implement the design of SMB processes. Results will be shown, illustrating the influence of equilibrium adsorption isotherms and mass transfer resistances on SMB performance. At the end of the chapter, two examples of SMB-related techniques will be discussed: the Varicol process, to be used inSMBunits with a lownumber of chromatographic columns; and the pseudo-SMB process, a modification of classic SMB operation to perform ternary separations.
- Synthesis of polyurethane-urea microcapsules with perfume for textile applicationPublication . Rodrigues, Sofia Nogueira; Martins, Isabel M.; Fernandes, Isabel P.; Barreiro, M.F.; Mata, Vera G.; Rodrigues, AlírioSynthesis of polyurethane-urea microcapsules with perfume for textile application. In Particules - Micro-Nano encapsulation. Belrlin, Germany. Resumo: This work is a contribution to the introduction of emergent technologies in the textile sector, namely the microencapsulation of fragrances and its application to obtain added-value products. Polyurethane/urea microcapsules with a perfume have been produced using the interfacial polymerization technology for industrial application on textile substrate having in view man suits production. The specific objective of this work is the production of a scented clothing line, which includes: Development of technologies/processes for the production of microcapsules; Incorporation of microcapsules into textile substrates and optimization of the process in a laboratory; Validation and industrial scale-up; Development of testing methods and analysis of the release of the perfume.
- Synthesis of polyurethane-urea microcapsules with perfume for textile applicationPublication . Rodrigues, Sofia Nogueira; Martins, Isabel M.; Mata, Vera G.; Barreiro, M.F.; Rodrigues, AlírioThis work is a contribution to the introduction of emergent technologies in the textile sector, namely the microencapsulation of fragrances and its application to obtain added-value products. Polyurethane/urea microcapsules with a perfume have been produced using the interfacial polymerization technology for industrial application on textile substrate having in view man suits production. The specific objective of this work is the production of a scented clothing line, which includes: Development of technologies/processes for the production of microcapsules; Incorporation of microcapsules into textile substrates and optimization of the process in a laboratory; Validation and industrial scale-up; Development of testing methods and analysis of the release of the perfume.
- Technologies for producing microcapsules with added valuePublication . Rodrigues, Sofia Nogueira; Martins, Isabel M.; Mata, Vera G.; Barreiro, M.F.; Rodrigues, AlírioTwo technologies were studied to produce microcapsules for different application. Interfacial polymerization was applied to produce polyurethane urea (PUU) microcapsules with limonene oil for textile application and coacervation was applied to produce polylactide (PLA) microcapsules with thyme oil for cosmetics application. The production of PUU microcapsules using interfacial polymerization technology was performed in a basic IKA Miniplant laboratory reactor, in order to produce microcapsules with controlled parameters. In this formulation, limonene fragrant chemical chatracteristic of lemon oil was microencapsulated, because lemon oil was the most used oil in perfumery. Coacervation was the chosen technique to produce PLA microcapsules using thyme oil, an antioxidant and antimicrobial agent as the core material. The novelty of our approach consists on dissolving PLA in dimethylformamide (DMF) which is a good solvent for PLA but in addition has a high solubility in water. Upon contact with water, the homogeneous solution of PLA in DMF promote the precipitation of PLA around the thyme oil core. The characterization of PUU and PLA microcapsules includes size distribution, optical microscopy, scanning electron microscopy and Headspace/GC/FID.