Angebote zu "Precursors" (19 Treffer)

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Preparation of Activated Carbon from low cost P...
81,30 € *
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Low cost agricultural waste material and animal bones were utilized for the preparation of activated carbon. Industrial spent carbon was also regenerated. The carbon samples were activated chemically and by thermal means (400-1000°C). The samples were characterized by surface area (BET, DR, BJH, Langmuir) with pore volume, FTIR, XRD, SEM and EDS. The rate of adsorption of dyes on the carbon samples was high in the initial fifteen seconds and then declined due to its diffusion in to the micropores. Negative values of entropy of activation ( S) of the dyes adsorption reflected the affinity of the dye molecules towards the carbon surface which were found to decrease with the increase in adsorption temperature. The linear plots of Bangham and intraparticle diffusion models showed that the adsorption of dye on the carbon surface is a diffusion controlled process. The Freundlich, Langmuir and DR models were used to estimate the adsorption parameters. The best fit of the isotherms, found from the correlation coefficients (r2) were in the sequence: DR Langmuir Freundlich.

Anbieter: Dodax AT
Stand: 22.01.2020
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Preparation of Activated Carbon from low cost P...
79,00 € *
ggf. zzgl. Versand

Low cost agricultural waste material and animal bones were utilized for the preparation of activated carbon. Industrial spent carbon was also regenerated. The carbon samples were activated chemically and by thermal means (400-1000°C). The samples were characterized by surface area (BET, DR, BJH, Langmuir) with pore volume, FTIR, XRD, SEM and EDS. The rate of adsorption of dyes on the carbon samples was high in the initial fifteen seconds and then declined due to its diffusion in to the micropores. Negative values of entropy of activation ( S) of the dyes adsorption reflected the affinity of the dye molecules towards the carbon surface which were found to decrease with the increase in adsorption temperature. The linear plots of Bangham and intraparticle diffusion models showed that the adsorption of dye on the carbon surface is a diffusion controlled process. The Freundlich, Langmuir and DR models were used to estimate the adsorption parameters. The best fit of the isotherms, found from the correlation coefficients (r2) were in the sequence: DR Langmuir Freundlich.

Anbieter: Dodax
Stand: 22.01.2020
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Nanocellulose: Chemistry and Application for th...
82,20 € *
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Over the last two decades, the use of cellulosic fibers as reinforcing elements in polymeric matrix has been the subject of a good deal of work. Essential reasons for this is the possibility of replacing conventional fibers such as glass by natural cellulosic fibers in reinforced composites due to the abundance, renewable, low cost and eco-friendly nature of cellulose. The original work of the candidate presented in book is undertaken with a view to accomplish technological through harnessing nanotechnology in development of novel precursors for use in different applications especially in green synthesis of nanostructural materials. The as prepared cellulose nanowhiskers (CNW) are chemically modified through grafting and etherification and the onset of this on their ability to form nanocomposites are investigated. Utilization of this newly prepared nanocellulosics as precursors in green synthesis of metal nanoparticles are studied. Also studied are the applications of CNW in textile wet processing and other disciplines. Moreover, optimization of the potential properties of stimuli responsive hydrogels nanocomposites will be addressed in terms of in-vitro drug release.

Anbieter: Dodax AT
Stand: 22.01.2020
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Nanocellulose: Chemistry and Application for th...
79,90 € *
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Over the last two decades, the use of cellulosic fibers as reinforcing elements in polymeric matrix has been the subject of a good deal of work. Essential reasons for this is the possibility of replacing conventional fibers such as glass by natural cellulosic fibers in reinforced composites due to the abundance, renewable, low cost and eco-friendly nature of cellulose. The original work of the candidate presented in book is undertaken with a view to accomplish technological through harnessing nanotechnology in development of novel precursors for use in different applications especially in green synthesis of nanostructural materials. The as prepared cellulose nanowhiskers (CNW) are chemically modified through grafting and etherification and the onset of this on their ability to form nanocomposites are investigated. Utilization of this newly prepared nanocellulosics as precursors in green synthesis of metal nanoparticles are studied. Also studied are the applications of CNW in textile wet processing and other disciplines. Moreover, optimization of the potential properties of stimuli responsive hydrogels nanocomposites will be addressed in terms of in-vitro drug release.

Anbieter: Dodax
Stand: 22.01.2020
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Electrochromic Properties of Nickel Oxide-Polym...
74,00 € *
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The present work planned to synthesize NiO/PPy and NiO/PANI thin films by electrodeposition and chemical bath deposition respectively. In conclusion, we could successfully demonstrate: (i) Cost-effective one step deposition of NiO thin films at room temperature from low-cost precursors. (ii) Electrochemically stable NiO sample with moderate colouration efficiency. (iii) NiO-PPY composites with excellent stability and fast switching response. (iv) NiO-PANI composites with higher colouration efficiency, faster response time, stable and marvelous range of colours. (v) It is concluded that the strong co-ordinate bonding between NiO and organic polymer (PPY and PANI) resulted into the marked improvement in their EC performance. (vi) This strategy would also pave the novel way to synthesize variety of combination of the oxide-polymer composites (via combination of cost-effective ED and CBD methods) on large areas, suitable for building facades as smart windows. This route would offer a smarter and enabling way for energy efficient buildings, thereby helping conservation of energy, the urgently needed technology to override energy crisis in India.

Anbieter: Dodax AT
Stand: 22.01.2020
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Electrochromic Properties of Nickel Oxide-Polym...
71,90 € *
ggf. zzgl. Versand

The present work planned to synthesize NiO/PPy and NiO/PANI thin films by electrodeposition and chemical bath deposition respectively. In conclusion, we could successfully demonstrate: (i) Cost-effective one step deposition of NiO thin films at room temperature from low-cost precursors. (ii) Electrochemically stable NiO sample with moderate colouration efficiency. (iii) NiO-PPY composites with excellent stability and fast switching response. (iv) NiO-PANI composites with higher colouration efficiency, faster response time, stable and marvelous range of colours. (v) It is concluded that the strong co-ordinate bonding between NiO and organic polymer (PPY and PANI) resulted into the marked improvement in their EC performance. (vi) This strategy would also pave the novel way to synthesize variety of combination of the oxide-polymer composites (via combination of cost-effective ED and CBD methods) on large areas, suitable for building facades as smart windows. This route would offer a smarter and enabling way for energy efficient buildings, thereby helping conservation of energy, the urgently needed technology to override energy crisis in India.

Anbieter: Dodax
Stand: 22.01.2020
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Carbon Fibre from Lignin
57,38 € *
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This book presents detailed information on the production and properties of carbon fibers derived from lignin precursors. Focusing on future directions in the carbon fiber industry, it also introduces a novel process for obtaining high-purity lignin, a key aspect in the manufacture of high-quality carbon fiber. Carbon fiber is currently the most preferred lightweight manufacturing material and is rapidly becoming the material of choice for manufacturers around the world. Although more than 80% of commercial carbon fiber is estimated to use PAN (polyacrylonitrile) as a precursor, carbon fiber manufactured from PAN is expensive and therefore its application is limited to high-performance structural materials. Lignin is the second most abundant biopolymer in nature after cellulose and offers a carbon-rich, renewable resource. As a byproduct of the pulp and paper industry and the production of cellulosic ethanol, lignin is also available at low cost, making it an economically attractive alternative to PAN for the production of carbon fibers, as highlighted in this book. The information presented will be of interest to all those involved in the investigation of carbon fiber materials, carbon fiber manufacturers and carbon fiber users.

Anbieter: Dodax
Stand: 22.01.2020
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Carbon Fibre from Lignin
57,38 € *
ggf. zzgl. Versand

This book presents detailed information on the production and properties of carbon fibers derived from lignin precursors. Focusing on future directions in the carbon fiber industry, it also introduces a novel process for obtaining high-purity lignin, a key aspect in the manufacture of high-quality carbon fiber. Carbon fiber is currently the most preferred lightweight manufacturing material and is rapidly becoming the material of choice for manufacturers around the world. Although more than 80% of commercial carbon fiber is estimated to use PAN (polyacrylonitrile) as a precursor, carbon fiber manufactured from PAN is expensive and therefore its application is limited to high-performance structural materials. Lignin is the second most abundant biopolymer in nature after cellulose and offers a carbon-rich, renewable resource. As a byproduct of the pulp and paper industry and the production of cellulosic ethanol, lignin is also available at low cost, making it an economically attractive alternative to PAN for the production of carbon fibers, as highlighted in this book. The information presented will be of interest to all those involved in the investigation of carbon fiber materials, carbon fiber manufacturers and carbon fiber users.

Anbieter: Dodax AT
Stand: 22.01.2020
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Nanofiltration
35,00 € *
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High Quality Content by WIKIPEDIA articles! Nanofiltration is a relatively recent membrane filtration process used most often with low total dissolved solids water such as surface water and fresh groundwater, with the purpose of softening (polyvalent cation removal) and removal of disinfection by-product precursors such as natural organic matter and synthetic organic matter.Nanofiltration is also becoming more widely used in food processing applications such as dairy, for simultaneous concentration and partial (monovalent ion) demineralisation.Nanofiltration (NF) is a cross-flow filtration technology which ranges somewhere between ultrafiltration (UF) and reverse osmosis (RO). The nominal pore size of the membrane is typically below 100 nanometres, thus Nanofiltration. Nanofilter membranes are typically rated by molecular weight cut-off (MWCO) rather than nominal pore size. The transmembrane pressure (pressure drop across the membrane) required is considerably lower than the one used for RO, reducing the operating cost significantly. However, NF membranes are still subject to scaling and fouling and often modifiers such as anti-scalants are required for use.

Anbieter: Dodax AT
Stand: 22.01.2020
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