Person: SARIER, NİHAL
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SARIER
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NİHAL
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Publication The Manufacturing Of Polyamide- And Polypropylene-Organoclay Nanocomposite Filaments And Their Suitability For Textile Applications(Elsevier Science Bv, Po Box 211, 1000 Ae Amsterdam, Netherlands, 2012-09-10) Önder, Emel; Ersoy, M. Sabri; SARIER, NİHAL; TR11772; TR10598; TR114920In this study, we prepared polymer-clay monofilaments using a melt spinning technique in which organoclays were incorporated into polyamide 6 (PA6) and polypropylene (PP) homopolymer resins. The structural and thermal characterizations of the monofilaments were performed by Fourier transform infrared spectrometry (FTIR), scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and thermogravimetric (TG) analyses. The detailed mechanical and dynamic mechanical analyses (DMA) of the nanocomposite filaments were conducted to evaluate their mechanical performances in relation to the type and ratio of organoclays incorporated into the structure. Thermal analysis, tensile rest and dynamic mechanic analysis results show that the properties of the nanocomposite fibers were considerably more desirable compared with those of ordinary PP and PA6 fibers. (C) 2012 Elsevier B.V. All rights reserved.Publication Preparation of Shape Stabilized Phase Change Materials by Coaxial Electrospinning(2018) Önder Karaoğlu, Emel; Boz, Ezgi Ceren; SARIER, NİHAL; ARAT, REFİK; 114920; 3551Publication Biodegradable Pectin Based Agrotextiles(2013) Özay, Seray; Ukuser, Gökçen; SARIER, NİHAL; ARAT, REFİK; ; 114920Publication Thermal Characteristics of Polyurethane Foams Incorporated with Phase Change Materials(ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS, 2007-03-15) Önder, Emel; SARIER, NİHAL; TR114920; TR10598Thermal energy storage plays an important role in heat management because of the demand for developed energy conservation, and has applications in diverse areas, from building heating/cooling systems which enable solar energy incorporation into the structure, to textiles and clothings providing an enhanced thermal comfort. In this study, we aimed to improve thermal characteristics of polyurethane rigid foams that have been widely used for thermal insulation as the ultimate energy savers due to their ability to form sandwich structures with various facer materials. Through a laboratory-scale work, two paraffin waxes acting as phase change materials, namely n-hexadecane and n-octadecane, each of which is capable of managing large heat storage/release, were directly incorporated into the polyurethane foams at different ratios. Polymerization modified by means of n-alkane addition could be achieved without any adverse effect. In order to determine both structural and thermal characteristics, seven types of foams produced were examined by FT-IR, SEM, DSC analyses, calorimeter bomb and mechanical tests. Results show that polyurethane foams can be designed as thermal insulators equipped with an improved buffering function against temperature changes. (c) 2007 Elsevier B.V. All rights reserved.Publication Preparation of magnetite nanoparticle and fatty alcohol/acidincorporated poly(methacrylic acid-ethyl acrylate) nanowebs via electrospinning for magnetic hyperthermia application(RADIOMAG: Annual Action Conference and MC meeting, Bilbao, 2017) Önder Karaoğlu, Emel; SARIER, NİHAL; ARAT, REFİK; 114920; 10598Publication New Approaches for Improving Thermal Properties of Textile Materials(2013) Uludağ, Burcu; Önder Karaoğlu, Emel; SARIER, NİHAL; 10598; 114920Publication Synthesis of Biobased Oleocarbonates and Their Use in the Production of Thermally Enhanced Nanofibers by Electrospinning(2015) Boz, Ezgi Ceren; Önder Karaoğlu, Emel; SARIER, NİHAL; ARAT, REFİK; 114920; 10598Thermal management named as the dynamic heat-storage, has attracted more attention in the last decade because of the demand for developed energy conservation as well as improved thermal comfort. Phase change materials (PCMs), as thermally active materials, have a buffering effect against temperature changes. A PCM is capable of absorbing or releasing large amount of heat during phase transitions between two solid states and/or liquid and solid states. Various encapsulating and shape stabilizing methods for PCMs have been developed by researchers and industry prior to their application on the surfaces for reducing their reactivity with the outside environment, decreasing the evaporation and diffusion rates and promoting the ease of handling [1]. Fatty acids, fatty alcohols and their derivatives, obtained from fats and oils, serve as an important raw material for the oleochemical industry, since they are from biomass resources. Recently, fatty acids and their derivatives have attracted attention as potential biobased PCM candidates in consequence of their attractive thermal characteristics [2,3]. With the aim of spreading out the biobased PCMs away from fatty acids and fatty acid derivatives, this study concerns with the synthesis of two oleocarbonates, namely dihexadecyl carbonate and dioctadecyl carbonate, from fatty alcohols through a carbonate interchange reaction, and examines for their potential to be used as potential biobased PCM in dynamic thermal management of various composites such as clothing textiles and building envelopes. In the second part of the study, bicomponent nanofibers of those oleocarbonates have been produced using poly olefins as shell and oleocarbonates as core material by the coaxial electrospinning process. The thermal behaviors of dihexadecyl and dioctadecyl carbonates during heating and successive cooling in DSC analysis are given in Figure 1. The heat capacity of dihexadecyl carbonate was 192.8 Jg-1 between 33.9–47.8 C and of dioctadecyl carbonate was 178.2 Jg-1 at 47.4–51.1 C which were quite remarkable in terms of their contribution to the dynamic thermal management of PCM incorporated products. Electrospun nanofibers, carrying the thermal properties of corresponding oleocarbonate, were highly competitive with other existing strategies of encapsulating and shape-stabilizing PCMs.Publication Thermal insulation capability of PEG-containing polyurethane foams(ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS, 2008-09-15) Önder, Emel; SARIER, NİHAL; TR114920; TR10598Polyethylene glycol (PEG) compounds and mixtures have many properties that make them suitable for thermal applications in buildings, such as having high heat of fusion, phase change repeatability, chemical stability, non-corrosive behavior, and low-cost. In this study, we developed a number of PU rigid foams incorporated with three types of PEGs, as new insulation materials provided with an enhanced thermal capacity, and sought their suitability for various applications Such as layer of floor and ceiling coverings in constructions. insulations in controlled temperature transportation packaging, inner coverings of automobile seats, etc. In order to investigate the thermal properties of PEG-containing PU foams, differential scanning calorimeter (DSC) tests were conducted first. Then, a two-layer concrete-PU foam system was designed in the laboratory conditions to examine the insulation performances via using a computer-aided thermal measurement setup which was sensitive to the simulated environmental temperature changes. The PU-PEG composites produced here can be helpful for the design of thermal insulators. PUI, including 44% PEG 600, exhibited fairly efficient thermal regulation under moderate ambient temperature conditions, whereas PUII (49% PEG 1000) is suitable for temperature control in both mild and hot surroundings. PUIII, containing 53% PEG 1500, showed suitable heat storage and thermal stability characteristics. PUIV, containing 38% PEG 600/PEG 1000/PEG 1500, also confirmed good thermal and durability characteristics. The blend of three PEGs is suitable for preventing discontinuous thermal regulation when the external temperature increases or decreases. PU foams containing PEGs can be assumed to be leak-resistant, which is promising for their industrial applications. (C) 2008 Elsevier B.V. All rights reserved.Publication Ethanol Sensing with Pure and Boric Acid Doped Eectrospun CuInS2 Nanofibers in the Presence of Relative Humidity(ELSEVIER SCI LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND, 2019-12) Yağcı, Özlem; Ömür, Birsel Can; Altındal, Ahmet; SARIER, NİHAL; ARAT, REFİKThe influence of boric acid doping on ethanol vapor sensing performance of electrospun copper indium disulfide (CuInS2) nanofibers in the presence of various levels of relative humidity was examined for the first time. Pure and boric doped CuInS2 nanofibers are prepared through electrospinning method and characterized by X-ray diffraction, scanning electron microscope, Fourier transform infrared spectroscopy and Thermogravimetric analysis techniques. It was found that not only the ethanol sensing performance but also base line current of the CuInS2 nanofiber based sensors are greatly influenced by the boric acid doping level. Maximum sensitivity was obtained with pure CuInS2 under humid conditions. Kinetic studies indicated that ethanol vapor adsorption kinetics strongly depend on level of the relative humidity and the ethanol concentration.Publication Organic Modification Of Montmorillonite With Low Molecular Weight Polyethylene Glycols And İts Use İn Polyurethane Nanocomposite Foams(Elsevier Science Bv, Po Box 211, 1000 Ae Amsterdam, Netherlands, 2010-10-20) Önder, Emel; SARIER, NİHAL; TR114920; TR10598This paper deals with the preparation of organoclays by intercalating poly(ethylene glycol) molecules (PEG) between Na montmorillonite (Na-MMT) layers in a clay-water suspension system. X-ray diffraction (XRD) results of organoclays revealed that galleries of MMT were expanded after their intercalation with three different low molecular weight PEGs, including PEG600, PEG1000 and PEG1500. Thus, the distance of the interlayer spacing of MMT, d = 1.38 nm, was increased to d = 1.72, 1.75 and 1.69 nm, respectively, in the organoclay samples. The results of Fourier transform infrared spectroscopic (FTIR), thermogravimetric (IG) and scanning electron microscopic (SEM) analyses supported the findings of XRD and implied that the clay mineral mainly lost its hydrophilic character and gained organophilic features. The organoclay samples also presented improved thermal stabilities. In addition, polyurethane rigid nanocomposite foams composed of 2% organoclays were synthesized, and the effects of the organoclays on the thermal and mechanical performance of the nanocomposite foams were investigated. (C) 2010 Elsevier B.V. All rights reserved.