The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
Agustin Mihi - One of the best experts on this subject based on the ideXlab platform.
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Hydroxypropyl Cellulose photonic architectures by soft nanoimprinting lithography
Nature Photonics, 2018Co-Authors: Andre Espinha, Camilla Dore, Cristiano Matricardi, M I Alonso, A R Goni, Agustin MihiAbstract:As contamination and environmental degradation increase, there is a huge demand for new eco-friendly materials. Despite its use for thousands of years, Cellulose and its derivatives have gained renewed interest as favourable alternatives to conventional plastics, due to their abundance and lower environmental impact. Here, we report the fabrication of photonic and plasmonic structures by moulding Hydroxypropyl Cellulose into submicrometric periodic lattices, using soft lithography. This is an alternative way to achieve structural colour in this material, which is usually obtained by exploiting its chiral nematic phase. Cellulose-based photonic crystals are biocompatible and can be dissolved in water or not depending on the derivative employed. Patterned Cellulose membranes exhibit tunable colours and may be used to boost the photoluminescence of a host organic dye. Furthermore, we show how metal coating these Cellulose photonic architectures leads to plasmonic crystals with excellent optical properties acting as disposable surface-enhanced Raman spectroscopy substrates. Biodegradable Cellulose-based photonic and plasmonic architectures are fabricated via soft nanoimprinting lithography, and are used for structural colour generation, photoluminescence enhancement and as disposable surface-enhanced Raman scattering substrates.
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Hydroxypropyl Cellulose photonic architectures by soft nanoimprinting lithography
Nature Photonics, 2018Co-Authors: Andre Espinha, Camilla Dore, Cristiano Matricardi, M I Alonso, A R Goni, Agustin MihiAbstract:As contamination and environmental degradation increase nowadays, there is a huge demand for new eco-friendly materials. Despite its use for thousands of years, Cellulose and its derivatives have gained renewed interest as favourable alternatives to conventional plastics, due to their abundance and lower environmental impact. We report the fabrication of photonic and plasmonic structures by moulding Hydroxypropyl Cellulose into sub-micrometric periodic lattices, using soft lithography. This is an alternative way to achieve structural colour in this material which is usually obtained exploiting its chiral nematic phase. Cellulose based photonic crystals are biocompatible and can be dissolved in water or not depending on the derivative employed. Patterned Cellulose membranes exhibit tuneable colours and may be used to boost the photoluminescence of a host organic dye. Furthermore, we show how metal coating these Cellulose photonic architectures leads to plasmonic crystals with excellent optical properties acting as disposable surface enhanced Raman spectroscopy substrates.
E S Abdelhalim - One of the best experts on this subject based on the ideXlab platform.
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utilization of Hydroxypropyl Cellulose for green and efficient synthesis of silver nanoparticles
Carbohydrate Polymers, 2011Co-Authors: E S Abdelhalim, Salem S AldeyabAbstract:Abstract Hydroxypropyl Cellulose samples having different molar substitution were prepared through alkalization of Cellulose followed by etherification reaction with propylene oxide. Factors affecting Hydroxypropyl Cellulose preparation like alkali concentration, propylene oxide concentration as well as etherification reaction temperature and duration were extensively studied. The prepared Hydroxypropyl Cellulose samples were characterized by measuring their molar substitution and then were tried for their water solubility which showed that samples having molar substitution of 0.4 or higher are completely water soluble. The obtained Hydroxypropyl Cellulose samples were used in the preparation of silver nanoparticles through reduction of silver nitrate. UV–vis spectra of the prepared silver nanoparticles reveal that full reduction of silver ions to silver nanoparticles takes place at pH 12.5. Optimum conditions for conversion of silver ions to silver nanoparticles are to use 0.3% solution of Hydroxypropyl Cellulose having molar substitution of 0.42, carrying out the reaction at 90 °C for 90 min.
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utilization of Hydroxypropyl Cellulose and poly acrylic acid Hydroxypropyl Cellulose composite as thickeners for textile printing
Carbohydrate Polymers, 2008Co-Authors: E S Abdelhalim, Hossam E. Emam, M H ElrafieAbstract:Trials were carried out to partially replace kerosene oil with Hydroxypropyl Cellulose (HPC), poly (acrylic acid)-Hydroxypropyl Cellulose composite (poly (AA)-HPC) and their mixture in pigment printing paste. Partial replacement was carried out under a variety of conditions. Variables studied include type and concentration of the aqueous thickening agent and type of pigment dyes. In addition to that, poly (AA)-HPC composite was tried to replace sodium alginate in reactive printing. The fastness properties, color strength and stiffness were measured for the reactive and pigment printed samples.
Salem S Aldeyab - One of the best experts on this subject based on the ideXlab platform.
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green electrospining of Hydroxypropyl Cellulose nanofibres for drug delivery applications
Journal of Nanoscience and Nanotechnology, 2018Co-Authors: Mohamed H Elnewehy, Mehrez E Elnaggar, Saleh Alotaiby, Hany Elhamshary, Meera Moydeen, Salem S AldeyabAbstract:: Electrospun nanofibers mats are green synthesized using Hydroxypropyl Cellulose (HPC) individually or in conjugation with either poly(vinyl alcohol) (PVA) or Polyvinylpyrrolidone (PVP) to enhance the mechanical properties of the nanofibers mats. Desirable attributes of the as-obtained nanofibers mats are manifested via using SEM, FT-IR, TGA and conventional tools for mechanical and physical properties. The obtained data from SEM images demonstrated that the diclofenac sodium (DS) loaded nanofibers mats did not provide significant change of the morphological structure to the mats. In addition the thermal stability and the visual and mechanical properties of PVA or PVP was dramatically enhanced with the addition of HPC. The in vitro sustained release of DS drug was controlled when loaded into electrospun nanofibers of HPC with either PVA or PVP.
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utilization of Hydroxypropyl Cellulose for green and efficient synthesis of silver nanoparticles
Carbohydrate Polymers, 2011Co-Authors: E S Abdelhalim, Salem S AldeyabAbstract:Abstract Hydroxypropyl Cellulose samples having different molar substitution were prepared through alkalization of Cellulose followed by etherification reaction with propylene oxide. Factors affecting Hydroxypropyl Cellulose preparation like alkali concentration, propylene oxide concentration as well as etherification reaction temperature and duration were extensively studied. The prepared Hydroxypropyl Cellulose samples were characterized by measuring their molar substitution and then were tried for their water solubility which showed that samples having molar substitution of 0.4 or higher are completely water soluble. The obtained Hydroxypropyl Cellulose samples were used in the preparation of silver nanoparticles through reduction of silver nitrate. UV–vis spectra of the prepared silver nanoparticles reveal that full reduction of silver ions to silver nanoparticles takes place at pH 12.5. Optimum conditions for conversion of silver ions to silver nanoparticles are to use 0.3% solution of Hydroxypropyl Cellulose having molar substitution of 0.42, carrying out the reaction at 90 °C for 90 min.
Andre Espinha - One of the best experts on this subject based on the ideXlab platform.
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Hydroxypropyl Cellulose photonic architectures by soft nanoimprinting lithography
Nature Photonics, 2018Co-Authors: Andre Espinha, Camilla Dore, Cristiano Matricardi, M I Alonso, A R Goni, Agustin MihiAbstract:As contamination and environmental degradation increase, there is a huge demand for new eco-friendly materials. Despite its use for thousands of years, Cellulose and its derivatives have gained renewed interest as favourable alternatives to conventional plastics, due to their abundance and lower environmental impact. Here, we report the fabrication of photonic and plasmonic structures by moulding Hydroxypropyl Cellulose into submicrometric periodic lattices, using soft lithography. This is an alternative way to achieve structural colour in this material, which is usually obtained by exploiting its chiral nematic phase. Cellulose-based photonic crystals are biocompatible and can be dissolved in water or not depending on the derivative employed. Patterned Cellulose membranes exhibit tunable colours and may be used to boost the photoluminescence of a host organic dye. Furthermore, we show how metal coating these Cellulose photonic architectures leads to plasmonic crystals with excellent optical properties acting as disposable surface-enhanced Raman spectroscopy substrates. Biodegradable Cellulose-based photonic and plasmonic architectures are fabricated via soft nanoimprinting lithography, and are used for structural colour generation, photoluminescence enhancement and as disposable surface-enhanced Raman scattering substrates.
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Hydroxypropyl Cellulose photonic architectures by soft nanoimprinting lithography
Nature Photonics, 2018Co-Authors: Andre Espinha, Camilla Dore, Cristiano Matricardi, M I Alonso, A R Goni, Agustin MihiAbstract:As contamination and environmental degradation increase nowadays, there is a huge demand for new eco-friendly materials. Despite its use for thousands of years, Cellulose and its derivatives have gained renewed interest as favourable alternatives to conventional plastics, due to their abundance and lower environmental impact. We report the fabrication of photonic and plasmonic structures by moulding Hydroxypropyl Cellulose into sub-micrometric periodic lattices, using soft lithography. This is an alternative way to achieve structural colour in this material which is usually obtained exploiting its chiral nematic phase. Cellulose based photonic crystals are biocompatible and can be dissolved in water or not depending on the derivative employed. Patterned Cellulose membranes exhibit tuneable colours and may be used to boost the photoluminescence of a host organic dye. Furthermore, we show how metal coating these Cellulose photonic architectures leads to plasmonic crystals with excellent optical properties acting as disposable surface enhanced Raman spectroscopy substrates.
M I Alonso - One of the best experts on this subject based on the ideXlab platform.
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Hydroxypropyl Cellulose photonic architectures by soft nanoimprinting lithography
Nature Photonics, 2018Co-Authors: Andre Espinha, Camilla Dore, Cristiano Matricardi, M I Alonso, A R Goni, Agustin MihiAbstract:As contamination and environmental degradation increase, there is a huge demand for new eco-friendly materials. Despite its use for thousands of years, Cellulose and its derivatives have gained renewed interest as favourable alternatives to conventional plastics, due to their abundance and lower environmental impact. Here, we report the fabrication of photonic and plasmonic structures by moulding Hydroxypropyl Cellulose into submicrometric periodic lattices, using soft lithography. This is an alternative way to achieve structural colour in this material, which is usually obtained by exploiting its chiral nematic phase. Cellulose-based photonic crystals are biocompatible and can be dissolved in water or not depending on the derivative employed. Patterned Cellulose membranes exhibit tunable colours and may be used to boost the photoluminescence of a host organic dye. Furthermore, we show how metal coating these Cellulose photonic architectures leads to plasmonic crystals with excellent optical properties acting as disposable surface-enhanced Raman spectroscopy substrates. Biodegradable Cellulose-based photonic and plasmonic architectures are fabricated via soft nanoimprinting lithography, and are used for structural colour generation, photoluminescence enhancement and as disposable surface-enhanced Raman scattering substrates.
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Hydroxypropyl Cellulose photonic architectures by soft nanoimprinting lithography
Nature Photonics, 2018Co-Authors: Andre Espinha, Camilla Dore, Cristiano Matricardi, M I Alonso, A R Goni, Agustin MihiAbstract:As contamination and environmental degradation increase nowadays, there is a huge demand for new eco-friendly materials. Despite its use for thousands of years, Cellulose and its derivatives have gained renewed interest as favourable alternatives to conventional plastics, due to their abundance and lower environmental impact. We report the fabrication of photonic and plasmonic structures by moulding Hydroxypropyl Cellulose into sub-micrometric periodic lattices, using soft lithography. This is an alternative way to achieve structural colour in this material which is usually obtained exploiting its chiral nematic phase. Cellulose based photonic crystals are biocompatible and can be dissolved in water or not depending on the derivative employed. Patterned Cellulose membranes exhibit tuneable colours and may be used to boost the photoluminescence of a host organic dye. Furthermore, we show how metal coating these Cellulose photonic architectures leads to plasmonic crystals with excellent optical properties acting as disposable surface enhanced Raman spectroscopy substrates.
