Kurum Yazarı "Evingür, Gülşen Akın" Araştırma Çıktıları | TR-Dizin | WoS | Scopus | PubMed İçin Listeleme
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Evaluation of the fractal dimension of polyacrylamide during gelation and swelling
Arda, Ertan; Kara, Selim; Pekcan, Önder; Evingür, Gülşen Akın (Elsevier, 2021)The photon scattering method was performed to monitor the free radical crosslinking copolymerization (FCC) of acrylamide (AAm) applied with N,N'-methylenebis (acrylamide) (Bis) in time. FCC experiments were conducted using ... -
Fractal dimension and phase transition of graphene oxide (GO) doped polyacrylamide
Evingür, Gülşen Akın; Pekcan, Önder (Elsevier Sci Ltd, 2020)Graphene Oxide (GO)- Polyacrylamide composites prepared between 5 and 50 mu l GO were performed by Fluorescence Spectroscopy. The phase transition performed on the composites was measured by calculating the critical ... -
Gelation of PAAm-PVP composites: A fluorescence study
Evingür, Gülşen Akın; Kaygusuz, Hakan; Erim, F. Bedia; Pekcan, Önder (World Scientific Publ Co Pte Ltd, 2014)Hybrid hydrogels are a new class of composite materials. Polyacrylamide (PAAm) hydrogels are mainly produced by free radical crosslinking copolymerization (FCC) of AAm in the presence of N, N'-methylene bis (acrylamide) ... -
Investigation of Drying of Poly(N-isoproplacrylamide-co-acrylamide) by Fluorescence Technique
Evingür, Gülşen Akın; Pekcan, Önder (Wiley-Blackwell, 2013)The steady-state fluorescence technique was performed on drying of various molar percentages of poly(N-isopropylacrylamide-co- acrylamide) [poly(NIPA-co-AAc)] to elucidate the mechanism of temperature-induced phase separation ... -
Investigation of thermal effects and physical parameters on crosslinking by different riboflavin solutions and UV-A
Riboflavin-Dextran and Riboflavin-Dextrin solutions have the ability to create crosslinks between fibrilles in the biological tissues. These solutions cause the generation of free oxygen radicals by the excitement of UV ... -
Keratoconus Treatment: Some Physical Parameters of Different Solutions For Corneal Cross-Linking
Gözün birincil ışık kırıcı elementi olan kornea; göziçi elementler ve dış çevre arasında fiziksel bir bariyer gibi davranan berrak, saydam ve esnek bir dokudur. Kornea beş katmandan oluşur. Stroma tabakası özellikle kolajen ... -
Kinetic models for the dynamical behavior of polyacrylamide (PAAm)-kappa-carrageenan (kappa C) composite gels
Evingür, Gülşen Akın; Pekcan, Önder (Springer, 2015)A fluorescence method was employed for studying the drying and swelling of PAAm-kappa C composite gels, which were formed from acrylamide (AAm) and N, N'- methylenebisacrylamide (BIS) with various kappa-carrageenan (kappa ... -
Mechanical properties of graphene oxide-polyacrylamide composites before and after swelling in water
Evingür, Gülşen Akın; Pekcan, Önder (Springer, 2018)Polyacrylamide (PAAm) hydrogels have been proposed for use as promising biomaterials in biomedical and tissue engineering but their poor mechanical and water-retention properties have hindered their development. Graphene ... -
Monitoring of dynamical processes in PAAm-MWNTs composites by fluorescence method
Evingür, Gülşen Akın; Pekcan, Önder (Taylor & Francis Ltd, 2012)Polyacrylamide (PAAm)-multi walled carbon nanotube (MWNT) composites were prepared by free radical cross-linking copolymerization in water. Ammonium persulfate and N,N'-methylenebis (acrylamide) (BIS) were used as a free ... -
Monitoring the gelation of polyacrylamide-sodium alginate composite by fluorescence technique
Evingür, Gülşen Akın; Tezcan, Filiz; Erim, F. Bedia; Pekcan, Önder (Taylor & Francis Ltd, 2012)Polyacrylamide (PAAm)-sodium alginate (SA) composite was prepared with different amounts of SA varying in the range between 0.06% and 2% (w/v). The PAAm-SA composite was characterized by the steady-state fluorescence ... -
Optical energy band gap of PAAm-GO composites
Evingür, Gülşen Akın; Pekcan, Önder (Elsevier Sci Ltd, 2018)Graphene oxide (GO) can be used as an electron acceptor for polymers. The generation of the exciton in such materials is intimately related to the optical band gap. Polyacrylamide (PAAm) - graphene oxide (GO) composites ... -
Optical, Mechanical, and Electrical Properties of Polymer Composites Doped by Multiwalled Carbon Nanotubes
Evingür, Gülşen Akın; Pekcan, Önder (Intechopen, 2016)Three-dimensional networks can be hydrophilic and/or hygroscopic. Optical, mechanical, and electrical properties of these materials encompass many fields of technology. Composites of carbon nanotubes (CNTs) in polymeric ... -
PAAm-Kappa Carrageenan Composites: Drying and Swelling with Various Kappa Carrageenan Contents
Evingür, Gülşen Akın; Pekcan, Önder (Polish Acad Sciences Inst Physics, 2012)The purpose of this study is to discuss the role of kappa-carrageenan (kappa-car) in the drying and swelling of polyacrylamide (PAAm)-kappa-car composite. The fluorescence intensity of pyranine increased and decreased as ... -
Superelastic percolation network of polyacrylamide (PAAm)-kappa carrageenan (kappa C) composite
Evingür, Gülşen Akın; Pekcan, Önder (Springer, 2013)The elasticity of the polyacrylamide (PAAm)-kappa carrageenan (kappa C) composite was determined as a function of (w/v-%) kappa C content at 40 A degrees C. The gel composites studied contained various percentages (w/v-%) ... -
Surfactant and metal ion effects on the mechanical properties of alginate hydrogels
Kaygusuz, Hakan; Evingür, Gülşen Akın; Pekcan, Önder; Klitzing, von Regine; Erim, F. Bedia (Elsevier Science Bv, 2016)This paper addresses the controlled variation of the mechanical properties of alginate gel beads by changing the alginate concentration or by adding different surfactants or cross-linking cations. Alginate beads containing ... -
Temperature Effect on the Elasticity of Acrylamide-n-Isopropylacrylamide Copolymers
Evingür, Gülşen Akın; Pekcan, Önder (Taylor & Francis Inc, 2018)Acrylamide (AAm) - N-isopropylacrylamide (NIPA) copolymers were prepared via free radical crosslinking copolymerization with various weight percentages (wt%) of AAm and NIPA. The temperature dependence of the compressive ... -
Thermal effects on cornea during keratoconus treatment
Keratoconus is characterized by stromal thinning that leads to corneal surface distortion. It causes nanofibrils become weaker and change in cornea's shape. Cornea leans out. Symptoms such as astigmatism appeared as a ... -
Universality of elasticity on PAAM-NIPA copolymer gels
Evingür, Gülşen Akın; Pekcan, Önder (Edp Sciences S A, 2015)Polyacrylamide (PAAm)-N-isopropylacrylamide (NIPA) copolymers were prepared via free radical crosslinking copolymerization with different molar of NIPA varying in the range between 0 and 2 M. The mechanical properties of ... -
The WS(2)dependence on the elasticity and optical band gap energies of swollen PAAm composites
Evingür, Gülşen Akın; Sağlam, Nafia Alara; Çimen, Busra; Uysal, Bengü Özügür; Pekcan, Önder (Sage Publications Ltd, 2021)New generation nano-filler polymer composites have many applications including biomedical, electronic and maritime related applications because of their mechanical, electronic and optical properties. The properties of ...