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Ahmet Alper Aydın - One of the best experts on this subject based on the ideXlab platform.
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in situ preparation and characterization of encapsulated high chain Fatty Acid Ester based phase change material pcm in poly urethane urea by using amino alcohol
Chemical Engineering Journal, 2013Co-Authors: Ahmet Alper AydınAbstract:Abstract A Fatty Acid Ester-based phase change material (PCM) has been encapsulated with a proper poly-functional amino alcohol and toluene diisocyanate under in situ polymerization conditions for further use in thermal applications. N-(2-hydroxyethyl)ethylenediamine has been utilized for the first time for encapsulation of PCMs to form poly(urethane-urea) shell material. The research reports the influence of utilized anionic and non-ionic surfactants on properties of the encapsulated end products at different surfactant/PCM stoichiometric ratios. The thermal properties are reported in terms of phase change temperature, enthalpy and PCM encapsulation efficiency with necessary statistical calculations by differential scanning calorimeter (DSC) analyses after the conducted effective scrubbing procedure for excess PCM in the boundary layer and on walls of the shell material. Particle size distribution analysis and high-resolution transmission electron microscope (HRTEM) imaging have been utilized for further discussions on relations between surfactant types, stoichiometric ratios and structural properties. The prepared PCM composites with micro- and nano-structures are suitable candidates for use in desirable exterior building materials and solar units as outdoor thermal energy storage agents for construction of energy efficient buildings.
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Polyurethane rigid foam composites incorporated with Fatty Acid Ester-based phase change material
Energy Conversion and Management, 2013Co-Authors: Ahmet Alper Aydın, Hasancan OkutanAbstract:Abstract Polyurethane (PU) rigid foam structures are the most effective materials with the best insulation value per unit thickness and thermal energy storage via phase change materials (PCMs) offers flexibility to play key role in heat management. In this sense, the paper presents the feasibility of PU–PCM composites by direct utilization of a PCM and its compatibility with the used PU formulation recipe in terms of improved thermal characteristics. The thermal properties are reported in terms of phase change temperature, enthalpy, total absorbed heat and thermal decomposition with necessary statistical calculations. The stability of the PCM inside the foam matrix has also been investigated to clarify its leakage behavior. The particle distribution in the foam samples have been reported with optical microscope and scanning electron microscope (SEM) imaging. The DSC analyses indicate that the total heat absorption capacity can be improved up to 34% which represents the improved buffering function against temperature changes. The composites offer higher heat absorption capacity with combined heat deposition property of the PCM and thermal insulation property of the PU foam.
Uwe T Bornscheuer - One of the best experts on this subject based on the ideXlab platform.
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lipase catalyzed glucose Fatty Acid Ester synthesis in ionic liquids
Organic Letters, 2005Co-Authors: Franka Ganske, Uwe T BornscheuerAbstract:Glucose Fatty Acid Ester synthesis with poly(ethylene glycol)-modified Candida antarctica lipase B (CAL-B) was performed in pure 1-butyl-3-methyl imidazolium tetrafluoroborate [BMIM][BF4] (30% conversion) and in pure 1-butyl-3-methyl imidazolium hexafluorophosphate [BMIM][PF6] (35% conversion). In a solvent system composed of ionic liquid and 40% t-BuOH conversions up to 90% and isolated yields of up to 89% were achieved using Fatty Acid vinyl Esters as acyl donors and commercial CAL-B.
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lipase catalyzed glucose Fatty Acid Ester synthesis in ionic liquids
Organic Letters, 2005Co-Authors: Franka Ganske, Uwe T BornscheuerAbstract:[reaction: see text] Glucose Fatty Acid Ester synthesis with poly(ethylene glycol)-modified Candida antarctica lipase B (CAL-B) was performed in pure 1-butyl-3-methyl imidazolium tetrafluoroborate [BMIM][BF(4)] (30% conversion) and in pure 1-butyl-3-methyl imidazolium hexafluorophosphate [BMIM][PF(6)] (35% conversion). In a solvent system composed of ionic liquid and 40% t-BuOH conversions up to 90% and isolated yields of up to 89% were achieved using Fatty Acid vinyl Esters as acyl donors and commercial CAL-B.
Padmaja Shivanand - One of the best experts on this subject based on the ideXlab platform.
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release of chlorpheniramine maleate from Fatty Acid Ester matrix disks prepared by melt extrusion
Journal of Pharmacy and Pharmacology, 2011Co-Authors: W Prapaitrakul, Omar L Sprockel, Padmaja ShivanandAbstract:Chlorpheniramine maleate was incorporated into disks consisting of glyceryl Fatty Acid Esters, polyethylene glycol Fatty Acid Esters or a combination of the two. A melt-extrusion process was used to prepare the matrix disks containing the drug. The release of the drug into distilled water, pH 1.2 buffer, and pH 7.5 buffer showed the expected square root of time dependence. An increase in the Fatty Acid Ester hydrophilic-lipophilic balance (HLB) from 1 to 14 resulted in a 10-fold increase in the drug release rate from 0.25 +/- 0.01 to 25.84 +/- 1.29 mg cm-2 h-1/2. The maximum release rate was seen from the Fatty Acid Ester with a melting point of 44 degrees C. The pH of the dissolution medium had a small impact on the rate of drug release, but the rate of agitation had no significant influence on the rate of drug release. By blending a Fatty Acid Ester of a high melting point (64 degrees C) and a low HLB value of 2 with Esters of lower melting points (33 to 50 degrees C) or higher HLB values (10 to 14), it was possible to modify the release from 10.0 +/- 0.70 to 21.5 +/- 0.57 mg cm-2 h-1/2.
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release of chlorpheniramine maleate from Fatty Acid Ester matrix disks prepared by melt extrusion
Journal of Pharmacy and Pharmacology, 1991Co-Authors: W Prapaitrakul, Omar L Sprockel, Padmaja ShivanandAbstract:— Chlorpheniramine maleate was incorporated into disks consisting of glyceryl Fatty Acid Esters, polyethylene glycol Fatty Acid Esters or a combination of the two. A melt-extrusion process was used to prepare the matrix disks containing the drug. The release of the drug into distilled water, pH 1·2 buffer, and pH 7·5 buffer showed the expected square root of time dependence. An increase in the Fatty Acid Ester hydrophilic-lipophilic balance (HLB) from 1 to 14 resulted in a 10-fold increase in the drug release rate from 0·25 ± 0·01 to 25·84 ± 1·29 mg cm−2 h−½ The maximum release rate was seen from the Fatty Acid Ester with a melting point of 44°C. The pH of the dissolution medium had a small impact on the rate of drug release, but the rate of agitation had no significant influence on the rate of drug release. By blending a Fatty Acid Ester of a high melting point (64°C) and a low HLB value of 2 with Esters of lower melting points (33 to 50°C) or higher HLB values (10 to 14), it was possible to modify the release from 10·0 ± 0·70 to 21·5 ± 0·57 mg cm−2 h−½
Franka Ganske - One of the best experts on this subject based on the ideXlab platform.
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lipase catalyzed glucose Fatty Acid Ester synthesis in ionic liquids
Organic Letters, 2005Co-Authors: Franka Ganske, Uwe T BornscheuerAbstract:Glucose Fatty Acid Ester synthesis with poly(ethylene glycol)-modified Candida antarctica lipase B (CAL-B) was performed in pure 1-butyl-3-methyl imidazolium tetrafluoroborate [BMIM][BF4] (30% conversion) and in pure 1-butyl-3-methyl imidazolium hexafluorophosphate [BMIM][PF6] (35% conversion). In a solvent system composed of ionic liquid and 40% t-BuOH conversions up to 90% and isolated yields of up to 89% were achieved using Fatty Acid vinyl Esters as acyl donors and commercial CAL-B.
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lipase catalyzed glucose Fatty Acid Ester synthesis in ionic liquids
Organic Letters, 2005Co-Authors: Franka Ganske, Uwe T BornscheuerAbstract:[reaction: see text] Glucose Fatty Acid Ester synthesis with poly(ethylene glycol)-modified Candida antarctica lipase B (CAL-B) was performed in pure 1-butyl-3-methyl imidazolium tetrafluoroborate [BMIM][BF(4)] (30% conversion) and in pure 1-butyl-3-methyl imidazolium hexafluorophosphate [BMIM][PF(6)] (35% conversion). In a solvent system composed of ionic liquid and 40% t-BuOH conversions up to 90% and isolated yields of up to 89% were achieved using Fatty Acid vinyl Esters as acyl donors and commercial CAL-B.
Nobuji Nakatani - One of the best experts on this subject based on the ideXlab platform.
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novel trisaccharide Fatty Acid Ester identified from the fruits of morinda citrifolia noni
Journal of Agricultural and Food Chemistry, 1999Co-Authors: Mingfu Wang, Hiroe Kikuzaki, Geetha Ghai, Robe T Rose, Katali Csisza, Charles D Oyd, Alika Maunakea, Sheri F T Fong, Nobuji NakataniAbstract:Two known glycosides and a novel trisaccharide Fatty Acid Ester were isolated from the n-butanol-soluble fraction of the fruits of Morinda citrifolia (noni). Structure determination was carried out by spectral techniques such as MS, IR, NMR, and 2D-NMR. The novel trisaccharide Fatty Acid Ester was elucidated as 2,6-di-O-(β-d-glucopyranosyl)-1-O-octanoyl-β-d-glucopyranose. The known compounds were identified as rutin and asperulosidic Acid. Keywords: Noni; Morinda citrifolia; trisaccharide Fatty Acid Ester; 2,6-di-O-(β-d-glucopyranosyl-1-O-octanoyl-β-d-glucopyranose; rutin; asperulosidic Acid
