The Experts below are selected from a list of 13719 Experts worldwide ranked by ideXlab platform
Alenka Ristić - One of the best experts on this subject based on the ideXlab platform.
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New Composite Water Sorbents CaCl₂-PHTS for Low-Temperature Sorption Heat Storage: Determination of Structural Properties.
Nanomaterials (Basel Switzerland), 2018Co-Authors: Alenka Ristić, Nataša Zabukovec LogarAbstract:Sorption heat storage, as one of low-energy consuming technologies, is an approach to reduce CO₂ emissions. The efficiency of such technology is governed by the performance of the applied sorbents. Thus, sorbents with high Water Sorption Capacity and regeneration temperature from 80 to 150 °C are required. Incorporation of hygroscopic salt such as calcium chloride into porous materials is a logical strategy for increasing the Water Sorption Capacity. This work reports the study on the development of composites with PHTS (plugged hexagonal templated silicate) matrix with an average pore size of 5.7 nm and different amounts of calcium chloride (4, 10, 20 wt.%) for solar thermal energy storage. These composites were prepared by wetness incipient impregnation method. Structural properties were determined by X-ray diffraction (XRD), nitrogen physiSorption, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). CaCl₂ was confined in micro- and mesopores of the matrix. The resulting CaCl₂-PHTS materials were used for Water Sorption at 40 °C, showing an increase of maximal Water uptake with higher amount of calcium chloride from 0.78 g/g to 2.44 g/g of the dry composite. A small reduction in Water uptake was observed after 20 cycles of Sorption/deSorption between temperatures of 140 °C and 40 °C, indicating good cycling stability of these composites under the working conditions.
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Sorption composite materials for solar thermal energy storage
Energy Procedia, 2014Co-Authors: Alenka Ristić, Stefan K. HenningerAbstract:Two different composites, one with disordered mesoporous iron silicate matrix and the other with ordered mesoporous matrix together with calcium chloride, are presented. The introduction of CaCl2in the matrices improves the maximal Water Sorption Capacity. The composite with disordered mesoporous matrix showed a maximal Water uptake of 0.58 g/g at 5.6 kPa, while the composite with ordered mesoporous matrix revealed higher maximal Water uptake of 0.88 g/g. These composites show good hydrothermal stability after 20 cycles of Sorption/deSorption between temperatures of 150°C and 40°C and at Water vapor pressure of 5.6 kPa. After the cycling test no leakage of the salt hydrate from the composites was detected.
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New two-component Water sorbent CaCl2-FeKIL2 for solar thermal energy storage
Microporous and Mesoporous Materials, 2012Co-Authors: Alenka Ristić, Stefan K. Henninger, Darja Maučec, Venčeslav KaučičAbstract:A new two-component (composite) Water sorbent CaCl2-FeKIL2 has been developed for Sorption-based solar thermal energy storage. The matrix of the composite is FeKIL2 material with disordered mesopores, high surface area of 712 m 2 /g and mesopore dimensions between 4 and 29 nm. The composite, prepared by wet impregnation of FeKIL2 with CaCl2, has lower surface area (418 m 2 /g) and similar mesopore dimensions as the matrix. The maximum Water Sorption Capacity of FeKIL2 is 0.21 g/g, while the composite possesses 3 times higher maximum Water Sorption Capacity due to the presence of the salt in the matrix. Heat of adSorption of the composite is 50.4 kJ/mol. A short-term cycling test between temperatures of 150 and 40 C at a Water vapour pressure of 5.6 kPa confirms a comparatively good hydrothermal stability of the composite.
Stefan K. Henninger - One of the best experts on this subject based on the ideXlab platform.
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Sorption composite materials for solar thermal energy storage
Energy Procedia, 2014Co-Authors: Alenka Ristić, Stefan K. HenningerAbstract:Two different composites, one with disordered mesoporous iron silicate matrix and the other with ordered mesoporous matrix together with calcium chloride, are presented. The introduction of CaCl2in the matrices improves the maximal Water Sorption Capacity. The composite with disordered mesoporous matrix showed a maximal Water uptake of 0.58 g/g at 5.6 kPa, while the composite with ordered mesoporous matrix revealed higher maximal Water uptake of 0.88 g/g. These composites show good hydrothermal stability after 20 cycles of Sorption/deSorption between temperatures of 150°C and 40°C and at Water vapor pressure of 5.6 kPa. After the cycling test no leakage of the salt hydrate from the composites was detected.
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New two-component Water sorbent CaCl2-FeKIL2 for solar thermal energy storage
Microporous and Mesoporous Materials, 2012Co-Authors: Alenka Ristić, Stefan K. Henninger, Darja Maučec, Venčeslav KaučičAbstract:A new two-component (composite) Water sorbent CaCl2-FeKIL2 has been developed for Sorption-based solar thermal energy storage. The matrix of the composite is FeKIL2 material with disordered mesopores, high surface area of 712 m 2 /g and mesopore dimensions between 4 and 29 nm. The composite, prepared by wet impregnation of FeKIL2 with CaCl2, has lower surface area (418 m 2 /g) and similar mesopore dimensions as the matrix. The maximum Water Sorption Capacity of FeKIL2 is 0.21 g/g, while the composite possesses 3 times higher maximum Water Sorption Capacity due to the presence of the salt in the matrix. Heat of adSorption of the composite is 50.4 kJ/mol. A short-term cycling test between temperatures of 150 and 40 C at a Water vapour pressure of 5.6 kPa confirms a comparatively good hydrothermal stability of the composite.
Anil Kumar Bajpai - One of the best experts on this subject based on the ideXlab platform.
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Nano-silver hydroxyapatite based antibacterial 3D scaffolds of gelatin/alginate/poly (vinyl alcohol) for bone tissue engineering applications.
Colloids and surfaces. B Biointerfaces, 2019Co-Authors: Rajesh Kumar Saini, Laxami Prasad Bagri, Anil Kumar BajpaiAbstract:Abstract In the present study macroporous three dimensional spongy scaffolds composed of gelatin, alginate, and poly (vinyl alcohol) were prepared by cryogelation technique and silver hydroxyapatite was reinforced into the 3 D matrix. The polymer nanocomposite materials were characterized by analytical techniques such as Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and x-ray diffraction (XRD) analysis. The nanocomposite scaffolds were studied for their porous nature, Water Sorption Capacity, and mechanical behavior. The suitability of scaffolds for bone tissue engineering applications was judged by evaluating their antibacterial and cytotoxic nature against gram positive and gram negative bacteria, and MC3T3-E1 preosteoblast cells, respectively. The scaffolds were also studied for release of silver ions and the influence of various experimental conditions on the release profiles of silver ions was investigated.
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Designing polyethylene glycol (PEG) – plasticized membranes of poly(vinyl alcohol-g-methyl methacrylate) and investigation of Water Sorption and blood compatibility behaviors
Designed Monomers and Polymers, 2012Co-Authors: Sangeeta Jain, Anil Kumar BajpaiAbstract:Polyethylene glycol (PEG)-based semi-IPNs have been widely used as hydrogel matrices in tissue engineering applications because of their inherent hydrophilicity and biocompatibility. Today, synthetic scaffolds are being widely used in tissue engineering and allied applications because they offer the ability to precisely control the mechanical properties, morphology, and blood compatibility of the materials. In this regard, an attempt has been made to develop scaffolds membranes by judiciously combining PEG, polyvinyl alcohol, and polymethyl methacrylate. The so prepared hydrogel membranes were undertaken for structural, morphological, and thermal characterization using FTIR, scanning electron microscope (SEM), and DSC techniques, respectively. The hydrogel films were investigated for Water Sorption Capacity under various experimental conditions such as changing chemical composition of the membrane, different pH, and temperature of the swelling media and varying simulated biological fluids. The hydrogel me...
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Fabrication of Interpenetrating Networks of Poly (vinyl alcohol-g-acrylamide) and Chitosan-g-polyacrylamide Chains and Evaluation of Water Sorption, Blood Compatibility and Cytotoxicity Behaviors
Polymer-Plastics Technology and Engineering, 2012Co-Authors: Suman Prabhakar, Jaya Bajpai, Anil Kumar BajpaiAbstract:In the present study an interpenetrating polymer network (IPN) of poly (vinyl alcohol-g-acrylamide) and chitosan-g-polyacrylamide chains were prepared by the redox polymerization method. The prepared network was characterized by FTIR, DSC and ESEM techniques. The hydrogels were evaluated for their Water intake potential and influence of various factors such as chemical composition of the hydrogels, pH and temperature of the swelling bath; various simulated biological fluids were investigated on the Water Sorption Capacity of the IPNs. The in-vitro blood compatibility of the prepared IPN was judged by blood-clot formation, percent haemolysis, protein (BSA) adSorption, and cytotoxicity methods.
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Studies on Mechanical and Antithrombogenic Behaviors of Polyvinyl Alcohol and Gelatin Based Novel Binary Polymer Blends with Grafted Polyacrylamide Chains
Journal of Macromolecular Science Part A, 2010Co-Authors: Sandeep Shukla, Anil Kumar Bajpai, Shefali Mishra, Manish Sharma, R. BajpaiAbstract:The aim of this study was to design a hydrophilic but mechanically strong macromolecular matrix to discover possible application as polymer scaffolds for tissue engineering and wound healing dressings. To achieve the objectives, acrylamide was polymerized by a redox couple in the immediate presence of polyvinyl alcohol, gelatin and a crosslinking agent (N, N′–methylene bis acrylamide). The structural and thermal characterization of the prepared hydrogels were carried out by Fourier Transform Infrared Spectroscopy (FTIR) and Differential Scanning Calorimetry (DSC) which confirmed the formation of polyacrylamide grafted network and presented combined thermal features of the constituent polymers in their thermogram. The Environmental Scanning Electron Microscopy (ESEM) techniques were utilized for morphological characterization and the hydrogels were found to exhibit a highly porous structure. The hydrogels were also investigated for Water Sorption Capacity and the extent of Water intake was found to depend ...
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Removal of arsenic ions from aqueous solutions by adSorption onto biopolymeric crosslinked calcium alginate beads
Toxicological & Environmental Chemistry, 2009Co-Authors: Tulika Dewangan, Alka Tiwari, Anil Kumar BajpaiAbstract:The present article discusses the removal of As (V) ions from dilute aqueous solutions by adSorption onto biopolymeric beads of crosslinked calcium alginate. The beads were characterized by FTIR spectroscopy and their Water Sorption Capacity was investigated. The process of adSorption of arsenic ions was monitored and various adSorption parameters were evaluated. The experiments were conducted to optimize the removal Capacity and study the influence of various experimental factors such as pH, initial metal ion concentrations, contact time, and solid-to-liquid ratio. The adSorption data were applied to Langmuir and Freundlich isotherm equations, and various static parameters were calculated.
Venčeslav Kaučič - One of the best experts on this subject based on the ideXlab platform.
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New two-component Water sorbent CaCl2-FeKIL2 for solar thermal energy storage
Microporous and Mesoporous Materials, 2012Co-Authors: Alenka Ristić, Stefan K. Henninger, Darja Maučec, Venčeslav KaučičAbstract:A new two-component (composite) Water sorbent CaCl2-FeKIL2 has been developed for Sorption-based solar thermal energy storage. The matrix of the composite is FeKIL2 material with disordered mesopores, high surface area of 712 m 2 /g and mesopore dimensions between 4 and 29 nm. The composite, prepared by wet impregnation of FeKIL2 with CaCl2, has lower surface area (418 m 2 /g) and similar mesopore dimensions as the matrix. The maximum Water Sorption Capacity of FeKIL2 is 0.21 g/g, while the composite possesses 3 times higher maximum Water Sorption Capacity due to the presence of the salt in the matrix. Heat of adSorption of the composite is 50.4 kJ/mol. A short-term cycling test between temperatures of 150 and 40 C at a Water vapour pressure of 5.6 kPa confirms a comparatively good hydrothermal stability of the composite.
Luisa Coderch - One of the best experts on this subject based on the ideXlab platform.
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Water Sorption of nails treated with wool keratin proteins and peptides
Journal of Thermal Analysis and Calorimetry, 2010Co-Authors: Clara Barba, Meritxell Martí, Alisa Dawn Roddick-lanzilotta, Albert M. Manich, J. Carilla, J.l. Parra, Luisa CoderchAbstract:Water has a considerable effect on human keratin fibres, such as nails, and is therefore crucial for their cosmetic performance. Wool proteins are mild, natural, biodegradable and are sustainably produced with multiple functionalities. They have a potential for use in the cosmetic and detergent markets. The effectiveness of two wool keratin ingredients in restoring the Water Sorption characteristics of nails was determined. Acetone treatment modified nail Water Sorption, resulting in an increase in Water Sorption Capacity and in nail permeability. The application of keratin peptides and proteins to healthy and damaged nails improved Water Sorption properties, reducing permeability, especially in the case of wool keratin protein treatment.
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Effect of wool keratin proteins and peptides on hair Water Sorption kinetics
Journal of Thermal Analysis and Calorimetry, 2010Co-Authors: Clara Barba, Meritxell Martí, Alisa Dawn Roddick-lanzilotta, Albert M. Manich, J. Carilla, J.l. Parra, Luisa CoderchAbstract:Most beauty care products and treatments primarily affect the cuticle layers of hair fibers. The resulting damage has an adverse effect on hair Water abSorption. Water changes a wide variety of properties of human hair and is therefore of fundamental interest. Wool proteins are mild, natural, biodegradable, and sustainably produced with multiple functionalities and potential for use in the personal care and detergent market. In this study, the effect on hair Water Sorption of two types of keratin samples obtained from wool is investigated. Modifications of hair Water Sorption due to a bleaching treatment have been demonstrated, with lower values of Water Sorption Capacity and an increase of the fibers permeability. Applications of keratin peptides and proteins to bleached hair improved the Water Sorption properties of the fibers and reduced their permeability.
