Yazar "Tuncel, Ali" seçeneğine göre listele
Listeleniyor 1 - 4 / 4
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Comparison of newly developed hydroxyl- functionalized monodisperse HILIC columns new HILIC column(Journal of Liquid Chromatography & Related Technologies, 2017) Dinç, Saliha; Samatya Ölmez, Saba; Tuncel, AliIn this study, new hydroxyl-functionalized monodisperse polymeric hydrophilic interaction chromatography (HILIC) columns were developed using different derivatization agents. In addition, the influences of derivatization temperature of the best agent and polymer composition on the separation were investigated under HILIC conditions. Monodisperse–porous hydrophilic particles were synthesized by the seeded polymerization method using 3-chloro-2-hydroxypropile methacrylate (HPMA-CL) and ethylene glycol dimethacrylate (EGDMA) monomers. The chloropropyl terminal ends of the poly(HPMA-Cl-coEGDMA) particles were derivatized with amine group of ethanolamine (EA), diethanolamine, and triethanolamine (TEA) at 80°C through nucleophilic reaction. The performance of synthesized particles was evaluated with the amount of ligand on the particle surfaces, column backpressure, and separation power under HILIC condition. TEA was found to be the best derivatization agent for the separation of toluene, acrylamide, thymine, adenine, and cytosine in respect to resolution factors (>1.5 for all analytes) and theoretical plate numbers (64.562 N/m for acylamide). Upon determination of the best ligand, then the effect of different derivatization temperatures and polymer composition on TEA performance was investigated. Of all the tested polymer compositions, the chromatographic performance of TEA-M-80 (the derivatization of TEA at 80°C together with M polymer composition) was found to be the best.Öğe Comparison of newly developed hydroxyl-functionalized monodisperse HILIC columns new HILIC column(Taylor & Francis Inc, 2017) Dinc, Saliha; Olmez, Saba Samatya; Tuncel, AliIn this study, new hydroxyl-functionalized monodisperse polymeric hydrophilic interaction chromatography (HILIC) columns were developed using different derivatization agents. In addition, the influences of derivatization temperature of the best agent and polymer composition on the separation were investigated under HILIC conditions. Monodisperse-porous hydrophilic particles were synthesized by the seeded polymerization method using 3-chloro-2-hydroxypropile methacrylate (HPMA-CL) and ethylene glycol dimethacrylate (EGDMA) monomers. The chloropropyl terminal ends of the poly(HPMA-Cl-co-EGDMA) particles were derivatized with amine group of ethanolamine (EA), diethanolamine, and triethanolamine (TEA) at 80 degrees C through nucleophilic reaction. The performance of synthesized particles was evaluated with the amount of ligand on the particle surfaces, column backpressure, and separation power under HILIC condition. TEA was found to be the best derivatization agent for the separation of toluene, acrylamide, thymine, adenine, and cytosine in respect to resolution factors (>1.5 for all analytes) and theoretical plate numbers (64.562N/m for acylamide). Upon determination of the best ligand, then the effect of different derivatization temperatures and polymer composition on TEA performance was investigated. Of all the tested polymer compositions, the chromatographic performance of TEA-M-80 (the derivatization of TEA at 80 degrees C together with M polymer composition) was found to be the best.Öğe The Novel Polymethacrylate Based Hydrophilic Stationary Phase for Ion Chromatography(Oxford Univ Press Inc, 2023) Olmez, Saba Samatya; Kokden, Didem; Tuncel, AliIon chromatography is widely used as a useful and powerful tool for the analysis of anionic and cationic components found in waters and aqueous media. The performance and selectivity of ion chromatography are based on the stationary phase column packed material. In this study, it is aimed to develop new column material with quaternary ammonium functional group based on monodisperse polymeric particles for ion chromatography and to investigate their chromatographic performance. For the analysis of inorganic anions by ion chromatography, new stationary phases macroporous monodisperse particles based on 3-chloro-2-hydroxy propylmethacrylate-co-ethylene dimethacrylate are obtained as column packing material. 3-chloro-2-hydroxy propylmethacrylate and ethylene glycol dimethacrylate are transformed to porous monodisperse particle form by using glycidyl methacrylate as the seed latex and ethyl benzene as the porogen solvent via micro-suspension polymerization technique. Then macroporous monodisperse particles surface is functionalized by triethylamine so strong anion exchange is obtained for ion chromatography packing material. A series of stationary phases prepared from polymer particles containing different amounts of porogen solvent were tested. The results show that column packing material is successful to separate inorganic anions mixture such as F-, Cl-, NO2-, Br-, NO3- by using the carbonate and bicarbonate solutions as mobile phases.Öğe Utilization of geothermal water as irrigation water after boron removal by monodisperse nanoporous polymers containing NMDG in sorption-ultrafiltration hybrid process(Elsevier, 2015) Samatya, Saba; Köseoğlu, Pelin; Kabay, Nalan; Tuncel, Ali; Yüksel, MithatA relatively new method of polymerization, 'modified seeded polymerization' has been used for the synthesis of monodisperse nanoporous poly(glycidyl methacrylate-co-ethylene dimethacrylate) and poly(vinylbenzyl chloride-co-divinylbenzene) beads. The synthesized polymer beads were then functionalized with N-methyl-D-glucamine (NMDG) to obtain boron selective resins. The efficiency of these particles for boron removal from geothermal water was investigated by using the hybrid process coupling sorption with ultrafiltration (UF) method where a submerged hollow fiber type UF membrane module was employed for filtration. It was possible to reduce the boron concentration from 11.0. mg/L to ?. 1. mg/L in 20. min with hybrid method using poly(glycidyl methacrylate-co-ethylene dimethacrylate)-NMDG beads with 4. g-resin/L-geothermal water. The respective period for poly(vinylbenzyl chloride-co-divinylbenzene) beads with the same resin dosage was 30. min. In the case of commercially available boron selective ion exchange resin Dowex-XUS 43594.00 ground to an average particle size of 20. ?m, the target boron concentration which is ?. 1. mg/L was reached in 20. min by using 2. g-resin/L-geothermal water. © 2015 Elsevier B.V.
