Published Papers

“Proton pathways via free volumes: A positron annihilation lifetime spectroscopy (PALS) investigation of proton conductivity in SPEEK-PEG-TMOS composites”, Mesut Yılmazoğlu, Ufuk Abaci, Hikmet Okkay, Ayse Yumak Yahsi, Cumali Tav, Ugur Yahsi, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 687, 133558 (2024). (https://doi.org/10.1016/j.colsurfa.2024.133558)

“Dielectric relaxation time of PVAc in terms of hole fraction calculated from the theory of Simha-Somcynsky”, Ayse Yumak Yahsi, Aseel Almashayek and Ugur Yahsi, Polymer, 126753 (2024) (https://doi.org/10.1016/j.polymer.2024.126753)

“Free volume investigation of PAMAM dendrimers using positron annihilation lifetime spectroscopy”, Ayse Yumak Yahsi, Humeyra Uzun; Adalet Nur Altunkaya; Arif Unalkizilirmak; Metin Tulu; Cumali Tav and Ugur Yahsi, Journal of Molecular Structure, 1302, 137527 (2024) (https://doi.org/10.1016/j.molstruc.2024.137527).

"Detailed investigation on the insulation and permeability characteristics of rigid polyurethane foam loaded with micron-sized turkey feather powder depending on the free volume change," Uğur Soykan, Sedat Çetin, Ugur Yahsi, Celular Polymers, 42 (5-6), 204-225 (2023)(https://doi.org/10.1177/02624893231204773)

"Investigation of Nd3+:Y2Si2O7 Phosphors Using Photoluminescence and Positron Annihilation Lifetime Spectroscopy," Leyla Nur Akay, Saygin Kuzeci, Necmettin Akti, Murat Erdem, Cumali Tav, Ugur Yahsi, Gonul Eryurek and Baldassare Di Bartolo, ECS Journal of Solid State Science and Technology, 12, 086005 (2023) (https://doi.org/10.1149/2162-8777/acf0e9)

"Decoding Polymer Architecture Effect on Ion-Clustering, Chain Dynamics and Ionic Conductivity in Polymer Electrolytes," Recep Bakar, Saeid Darvishi, Umut Aydemir, Ugur Yahsi, Cumali Tav, Madhusudan Tyagi, Yusuf Menceloglu, Erkan Senses, ACS Applied Energy Materials, 6, 7, 4053–4064 (2023) (https://doi.org/10.1021/acsaem.3c00310)

"The role of defects in the structural and photocatalytic properties of Mg/B co-doped ZnO nanoparticles", K. Senturk, B. Yalcin, I. E. Yalcin, M. C. Alphan, M. S. Sengul, C. Tav, U. Yahsi, Lutfi Arda, Journal of Materials Science: Materials in Electronics, 34, 847 (2023) (https://doi.org/10.1007/s10854-023-10208-0)

“Effects of sintering and zirconmullite doping on nanostructural vacancies of bovine hydroxyapatite by positron technique”, Leyla Nur Akay, Cevriye Kalkandelen, Necmettin Akti, Merve Sazimet Sengul, Cumali Tav, Ugur Yahsi, Ziya Engin Erkmen, Journal of the American Ceramic Society, 106 (5), 3220-3227 (2023). (https://doi.org/10.1111/jace.18985)

"Investigation of the relation between free volume and physico-mechanical performance in rigid polyurethane foam containing turkey feather fibers: Part 2", Uğur Soykan, Mustafa Khaleel, Sedat Cetin, Uğur Yahşi, Cumali Tav, Journal of Cellular Plastics, 58(6), 893-915 (2022). (https://doi.org/10.1177/0021955X221144541)

"Electronic ionization-induced annealing of pre-existing defects in Al2O3 and CaF2 single crystals", M. Izerrouken, R. Hazem, S. Kuzeci, C. Tav, U. Yahsi and S. Lemam, Philosophical Magazine Part A: Materials Science, 102(4), 283-298 (2022) (https://doi.org/10.1080/14786435.2021.1989075)

"Role of Free Volume in Mechanical Behaviors of Side Chain LCP Grafted Products of High Density Polyethylene", Behiye Ozturk Sen, Sedat Çetin, Ugur Yahşi and Ugur Soykan, Journal of Polymer Research, 28:313 (2021) (https://​doi.​org/​10.​1007/​s10965-021-02646-3)

"Effect of free volume on curcumin release from various polymer-based composite films analyzed using positron annihilation lifetime spectroscopy", Jong-Whan Rhim, Saygin Kuzeci, Swarup Roy, Necmettin Akti, Cumali Tav and Ugur Yahsi, Materials, 14, 5679 (2021) (https://doi.org/10.3390/ma14195679).

"Heavy ion irradiation induced defects in Zircaloy-4", M. Izerrouken, R. Hazem, U. Yahşi, S.E. Naceri, C. Tav, S. Küzeci, A. Sari, F. Haid, I. Ahmad, O. Mench and M. Ghamnia, Physica Scripta, 96, 045008 (2021). (https://doi.org/10.1088/1402-4896/abe3bf).

"Structural and dielectrical properties of PMMA/TiO2 composites in terms of free volume defects probed by positron annihilation lifetime spectroscopy", A. U. Kaya, G. Kosem, M. Y. Yener, U. Yahsi, C. Tav and K. Esmer, Polymers and Polymer Composites, 29(2), 107-116 (2021). (https://doi.org/10.1177/0967391120903533)

"Free volume, thermal and morphological properties of photocrosslinked thiol-ene/nanodiamond hybrid network" A. Beyler-Çiğil, S. Madakbaş, C. Tav; U. Yahşi and M. V. Kahraman, Pigment & Resin Technology, 50(2), 113-120 (2021). (https://doi.org/10.1108/PRT-05-2020-0045)

"Optical and photoluminescence spectroscopy analysis and Doppler broadening annihilation radiation studies of perovskites based on La1-XNiXMnO2.75 thin layers", A. Arrar, M. Benhaliliba, A. Boukhachem, U. Yahşi, T. Cumali, A. Yumak and M. Amlouk, Optik, 224, 165678 (2020).(https://doi.org/10.1016/j.ijleo.2020.165678)

"A detailed survey for determination of the grafted semifluorinated acrylic compound effect on thermal, microstructural, free volume, mechanical and morphological features of HDPE", Ugur Soykan, Behiye Ozturk Sen, Sedat Cetin, Ugur Yahsi and Cumali Tav, Journal of Fluorine Chemistry, 233, 109511 (2020). (https://doi.org/10.1016/j.jfluchem.2020.109511).

“Ionic Conductivity of PVdF-co-HFP with LiClO4: Free Volume Effects Probing by Positron Annihilation Lifetime Spectroscopy”, U. Yahsi, H. Deligöz, C. Tav, K. Ulutaş, D. Değer, S. Yılmaztürk, G. Erdemci, B. Coşkun, M. Yılmazoğlu and S. Yakut, Radiation Effects and Defects in Solids, 174(3), 214-228 (2019). (https://doi.org/10.1080/10420150.2018.1552959)

“Dielectric Properties and Conductivity of PVdF-co-HFP/LiClO4 Polymer Electrolytes”, K. Ulutaş, U. Yahsi, H. Deligöz, C. Tav, S. Yılmaztürk, M. Yılmazoğlu, G. Erdemci, B. Coşkun, Ş. Yakut and D. Değer, Can. J. Phys., 96(7), 786–791 (2018). (https://doi.org/10.1139/cjp-2017-0678)

“Effects of Boron Nitrite in Thermoplastic Polyurethane on Thermal, Electrical and Free Volume Properties”, M. Y. Yener, E. Basturk, S. Madakbas, V. Kahraman, F. Dumludag, M. A. Umer, U. Yahsi and C. Tav, Polymer Bulletin, 76, 4087–4101 (2019). (https://doi.org/10.1007/s00289-018-2560-2)

“Temperature and Weight Dependence of Free Volumes in Conducting Composite Polymer Using Positron Annihilation Techniques”, C. Tav and S. Yılmazturk, High Temperature Materials and Processes, 30(1-2), 193-198 (2011). (https://doi.org/10.1515/htmp.2011.028) Link

“A method for obtaining the pure annihilation peak of Na-22 radioisotope”, C. Celiktas and C. Tav, Radiation Measurements, 39(5), 569-572 (2005). (https://doi.org/10.1016/j.radmeas.2004.10.013)

“Molecular-weight Dependence of Free Volume in Polystyrene Studied by Positron Annihilation Measurements,” Z. Yu, U. Yahsi, J. D. McGervey, A. M. Jamieson and R. Simha, J. Polymer Science B: Polymer Physics, 32, 2637-2644 (1994). (https://doi.org/10.1002/polb.1994.090321609) (Citation Index = 82)