Browsing by Author "Demirci, Şahin"
Now showing items 1-19 of 19
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Alpha-Glucosidase Enzyme Immobilized Dextran-Co Metal Nanoparticle Cryogel Composite Systems as Dual Catalyst with Enhanced Stability and Catalytic Activity
Demirci, Şahin; Şahiner, Nurettin (John Wiley and Sons Inc, 2023)Here, dextran (Dex) cryogels were prepared and used for the immobilization of α-Glu enzyme via two different techniques of entrapment and covalent linking. The entrapment of α-Glu enzyme within Dex cryogels (α-GluE@Dex) ... -
Amine-modified halloysite nanotube embedded PEI cryogels as adsorbent nanoarchitectonics for recovery of valuable phenolic compounds from olive mill wastewater
Demirci, Şahin; Sağbaş Suner, Selin; Yılmaz, Selehattin; Bağdat, Sema; Tokay, Feyzullah; Şahiner, Nurettin (Elsevier Ltd, 2024)Here, natural tubular clays, halloysite nanotubes (Hal), were modified with ethylenediamine (EDA), triethylenetetramine (TETA), pentaethylenehexamine (PEHA), and polyethyleneimine (PEI) to enhance their adsorption capabilities ... -
B, P, and S heteroatom doped, bio- and hemo-compatible 2D graphitic-carbon nitride (g-C3N4) with antioxidant, light-induced antibacterial, and bioimaging endeavors
Demirci, Şahin; Sağbaş Suner, Selin; Uğuz Neli, Özlem; Koca, Atıf; Şahiner, Nurettin (Institute of Physics, 2024)The synthesis of two-dimensional (2D) graphitic g-C3N4 and heteroatom-doped graphitic H@g-C3N4 (H: B, P, or S) particles were successfully done using melamine as source compounds and boric acid, phosphorous red, and sulfur ... -
Chemically Cross-Linked Poly(β-Cyclodextrin) Particles as Promising Drug Delivery Materials
Demirci, Şahin; Khiev, Dawin; Can, Mehmet; Şahiner, Mehtap; Biswal, Manas R.; Ayyala, Ramesh S.; Şahiner, Nurettin (Amer Chemical Soc, 2021)One-pot synthesis of poly(β-cyclodextrin) (p(β-CD)) micro-/nanoparticles was accomplished using two different cross-linkers, divinyl sulfone (DVS) as p(β-CD)-1 and trimethylolpropane glycidyl ether (TMPGDE) as p(β-CD)-2. ... -
Chondroitin Sulfate-Based Cryogels for Biomedical Applications
Demirci, Şahin; Şahiner, Mehtap; Ari, Betül; Sunol, Aydın K.; Şahiner, Nurettin (MDPI, 2021)Cryogels attained from natural materials offer exceptional properties in applications such as tissue engineering. Moreover, Halloysite Nanotubes (HNT) at 1:0.5 weight ratio were embedded into CS cryogels to render additional ... -
Değişik Boyalar Yüklenmiş p(AMPS) Hidrojellerinin Optik Özelliklerinin ve Elektriksel İletkenliklerinin İncelenmesi
Demirci, Şahin; Şahiner, Nurettin; Sel, Kıvanç (Çanakkale Onsekiz Mart Üniversitesi, 2018-05)Bu çalışmada, öncelikle poli(2-akrilamido-2-metilpropan sülfonik asit) (p(AMPS)) türü hidrojeller sentezlenmiş ve sonrasında giemsa stain (GS), methylene blue (MB) ve rhodamin 6G (R6G) boya maddeleri ile yüklenmiştir. ... -
Improved Biomedical Properties of Polydopamine-Coated Carbon Nanotubes
Demirci, Şahin; Şahiner, Mehtap; Sağbaş Suner, Selin; Şahiner, Nurettin (MDPI, 2021)Carbon nanotubes (CNTs) due to their outstanding mechanical, thermal, chemical, and optical properties were utilized as a base material and were coated with polydopamine (PDA) (PDA@CNT) via the simple self-polymerization ... -
PEI modified natural sands of Florida as catalysts for hydrogen production from sodium borohydride dehydrogenation in methanol
Inger, Erk; Demirci, Şahin; Can, Mehmet; Sunol, Aydin K.; Philippidis, George; Şahiner, Nurettin (John Wiley and Sons Ltd, 2021)Sand samples from Tampa (T) and Panama (P) City beaches in Florida were used as catalysts for dehydrogenation of NaBH4 in methanol. T and P sand samples were sieved to [removed]500 μm sizes, and the smallest fractions ... -
PEI-M [M:Cu(II) and Co(II)] hydrogel catalyst for methyl orange degradation and epinephrine oxidation
Ghorbanloo, Massomeh; Demirci, Şahin; Şahiner, Nurettin (Çanakkale Onsekiz Mart Üniversitesi, 2015)Here, we report the catalytic activity of catalyst derived from polyethylene imine-M (II) (PEI-M: Cu(II), and Co(II)) hydrogel composite in the presence of H2O2 as an oxidant. The PEI-Cu(II)/H2O2 heterogeneous composite ... -
Physically and Chemically Crosslinked, Tannic Acid Embedded Linear PEI-Based Hydrogels and Cryogels with Natural Antibacterial and Antioxidant Properties
Şahiner, Mehtap; Yılmaz, Aynur Sanem; Demirci, Şahin; Şahiner, Nurettin (MDPI, 2023)Linear polyethyleneimine (L-PEI) was obtained from the acidic hydrolysis of poly(2-ethyl-2-oxazoline) and employed in the synthesis of physically crosslinked L-PEI hydrogel, PC-L-PEIH, chemically crosslinked L-PEI hydrogel, ... -
Poly(2-aminoethyl methacrylate) based microgels catalyst system to be used in hydrolysis and methanolysis of NaBH4 for H2 generation
Demirci, Şahin; Sutekin, S. Duygu; Güven, Olgun; Şahiner, Nurettin (Elsevier Ltd, 2023)The poly(2-aminoethyl methacrylate) (p(AEM)) microgels were synthesized by microemulsion polymerization technique and used for in situ metal nanoparticle preparation to render as p(AEM)-M (M: Co or Ni) microgel composites ... -
Poly(vinyl alcohol)-tannic Acid Cryogel Matrix as Antioxidant and Antibacterial Material
Arı, Betül; Şahiner, Mehtap; Demirci, Şahin; Şahiner, Nurettin (MDPI (Multidisciplinary Digital Publishing Institute), 2022)The biocompatible, viscoelastic properties of poly(vinyl alcohol) (PVA) in combination with the antimicrobial and antioxidant natural polyphenolic, tannic acid (TA), and the natural flavonoid and antioxidant curcumin ... -
Poly(Vinylamine) Derived N-Doped C-Dots with Antimicrobial and Antibiofilm Activities
Sutekin, Semiha Duygu; Şahiner, Mehtap; Suner, Selin Sağbaş; Demirci, Şahin; Güven, Olgun; Şahiner, Nurettin (MDPI (Multidisciplinary Digital Publishing Institute), 2021)Nitrogen-doped carbon dots (N-doped C-dots) was synthesized by using poly(vinyl amine) (PVAm) as a nitrogen source and citric acid (CA) as a carbon source via the hydrothermal method. Various weight ratios of CA and PVAm ... -
Preparation and Evaluation of Virgin Olive Oil Oleogels Including Thyme and Cumin Spices with Sunflower Wax
Yılmaz, Emin; Demirci, Şahin (MDPI AG, 2021)This study aimed to prepare and evaluate virgin olive oil (VOO) oleogels enriched with thyme and cumin spices with sunflower wax (SW) organogelator. Common physico‐chemical, structural, thermal, and rheological analyses ... -
Removal of Cd(II), Co(II), Cr(III), Ni(II), Pb(II) and Zn(II) ions from wastewater using polyethyleneimine (PEI) cryogels
Bağdat, Sema; Tokay, Feyzullah; Demirci, Şahin; Yılmaz, Selehattin; Şahiner, Nurettin (Academic Press, 2023)The removal of the target analytes, Cd(II), Co(II), Cr(III), Ni(II), Pb(II), and Zn(II) from contaminated waters was achieved using super porous polyethyleneimine (PEI) cryogels as adsorbent. The optimum values of the ... -
Rod-like L-Aspartic acid-Cu(II) metal organic frameworks; Synthesis, characterization and biomedical properties
Gizer, Görkem; Şahiner, Mehtap; Yıldırım, Yıldız; Demirci, Şahin; Can, Mehmet; Şahiner, Nurettin (Elsevier B.V., 2021)L-aspartic acid (L-AA) based MOFs were prepared from acetate, chloride, nitrate, and sulfate salts of Cu(II) ions as L-AA-Cu(II)-A,-C,-N,-S, respectively with 96.7 2.4, 89.8 3.1, 92.1 1.5, 74.6 5.2 m2/g, surface ... -
Sentetik gübre yükleme ve salım için hidrojel-kil kompozitleri
Demirci, Şahin; Alparslan, Duygu; Dudu, Tuğba Ersen; Aktaş, Nahit; Öztürk, Ömer Faruk; Şahiner, Nurettin (Çanakkale Onsekiz Mart Üniversitesi, 2015)Bu çalışmada, anyonik ve katyonik monomerler, 2- akrilamido 2- metil 1-propan sülfonik asit (AMPS) ve 3-akril amido propil trimetil amonyum klorür (APTMACl), ile bentonit ve kaolin içeren çapraz bağlı polimerik hidrojeller ... -
Synthesis and characterization of poly(Maltodextrin) microgel from maltodextrin as drug delivery system
Şahiner, Mehtap; Güngör, Buket; Sılan, Coşkun; Demirci, Şahin; Erdoğan, Hakika; Ayyala, Ramesh S.; Şahiner, Nurettin (Elsevier B.V., 2024)Microgels of maltodextrin (MDex) as poly(maltodextrin) (p(MDex)) were prepared by reverse-micelle crosslinking technique at various crosslinking ratios, 25, 50, and 100% based on the repeating unit of MDex using divinylsulfone ... -
Tunable fluorescent and antimicrobial properties of poly(vinyl amine) affected by the acidic or basic hydrolysis of poly(N-vinylformamide)
Demirci, Şahin; Kurt, Saliha B.; Güven, Olgun; Şahiner, Nurettin; Sütekin, S. Duygu (Wiley, 2021)Synthesis of poly(N-vinylformamide) (PNVF) and its subsequent hydrolysis toconvert it to poly(vinyl amine) (PVAm) were performed. Kinetics of acidic andbasic hydrolysis of poly(N-vinylformamide) (PNVF), and products of ...
