Yazar "Avcı, Nejmettin" için listeleme
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Asılı ve tek damla yöntemiyle liyotropik sıvı kristallerde yüzey gerilimlerinin belirlenmesi
Özden, Pınar; Avcı, Nejmettin (2017)Liyotropik sıvı kristaller kimyasal temizleyicilerden organik sıvılara kadar pek çok bileolu şturmaktadır. Kolloidal özelikleri nedeniyle bu malzemelerin yüzey gerilimlerinin belirlenmesi uygulama alanları için büyük önem ... -
Effect of a Trifluorophenyl-Based Monomer on the Electro-optic Performances of Polymer-Stabilized Blue Phase Liquid Crystals
Hu, Minggang; Li, Jiangwei; Avcı, Nejmettin (Springer, 2020)We synthesized one novel mono-functional acrylate monomer. The effect of the new monomer on blue phase liquid crystal stabilization and electro-optical properties was investigated with different reactive polymer concentration ... -
Electrical and photoresponse properties of metal–polymer–semiconductor device with TMPTA interface material
Özden, Pınar; Özden, Şadan; Pakma, Osman; Özenç, Mehmet Emin; Avcı, Nejmettin; Afşin Kariper I. (Springer, 2023)is study presents the pioneering fabrication of a metal–polymer–semiconductor (MPS) device, where trimethylolpropane triacrylate (TMPTA) was employed as the interface material for the first time. TMPTA offers significant ... -
Electrically tunable polarisation-independent blue-phase liquid crystal binary phase grating via phase-separated composite films
Avcı, Nejmettin; Hwang, Shug-June (Taylor & Francis Ltd, 2017)A simple method for fabricating polarisation-independent blue-phase liquid crystal phase grating is demonstrated by implementing photopolymerisation-induced phase separation through a binary photomask. The dynamic focusing ... -
High-diffraction-efficiency Fresnel lens based on annealed blue-phase liquid crystal-polymer composite
Lin, Hua-Yang; Avcı, Nejmettin; Hwang, Shug-June (Taylor & Francis Ltd, 2019)We demonstrated a relatively simple and effective method to fabricate a periodically isolated polymer wall of blue-phase liquid crystal Fresnel lens (BPLCFL) by employing a single-masking process of the ultraviolet (UV) ... -
The influence of diluter system on polymer-stabilised blue-phase liquid crystals
Avcı, Nejmettin (Taylor & Francis Ltd, 2018)In the present work, diluter effects on the phase transition temperatures and electro-optical properties of the polymer-stabilised blue-phase liquid crystals with microsecond respond time have been carried out. The temperature ... -
Influence of illumination intensity on the electrical properties of Al/NOA65/p-Si/Al heterojunction MPS device
Özden, Şadan; Avcı, Nejmettin; Pakma, Osman; Kariper, İ. Afşin (Springer, 2022)In this work, we report photodiode behavior on metal polymer semiconductor device with photopolymer interfacial layer for the first time. For this purpose, Al/NOA65/p-Si device was fabricated and the electric and dielectric ... -
Investigation of the viscoelastic properties of 4-propoxy-biphenyl-4-carbonitrile
Özden, Pınar; Mamuk, Atilla Eren; Avcı, Nejmettin (Taylor & Francis Ltd, 2019)We report on the temperature-dependent measurements of dielectric permittivity, birefringence, elastic constants and rotational viscosity for 4-propoxy-biphenyl-4-carbonitrile in the nematic region. The temperature dependence ... -
NOA61 photopolymer as an interface for Al/NOA61/p-Si/Al heterojunction MPS device
Özden, Şadan; Avcı, Nejmettin; Pakma, Osman; Kariper, Afşin (Springer, 2021)The effect of the NOA61 photopolymer organic interlayer on the electrical and dielectric properties of the Al/NOA61/p-Si/Al metal-polymer-semiconductor (MPS) device has been reported the first time. The device parameters ... -
Peculiarities of biphasic regions at phase transitions in oriented textures of 4-cyano-4 '-n-pentylbiphenyl
Nesrullajev, Arif; Avcı, Nejmettin; Oktik, Şener (Elsevier, 2007)Peculiarities of the biphasic regions at the direct and reverse phase transitions between homeotropic oriented nematic mesophase and isotropic liquid have been investigated in detail in this work. The shift of phase ... -
Polimer ile Kararlı Hale Gelen Mavi Faz Sıvı Kristallerine Polimer Yapıların Etkisi
Avcı, Nejmettin (2017)Bu çalışmada polimer yapıların mavi sıvı kristaller üzerindeki etkileri incelenmiştir. Polimer ağ oluşumları sayesinde oda sıcaklığının da dâhil olduğu geniş bir sıcaklık aralığında mavi faz sıvı kristal örnekleri elde ... -
Switchable polarisation-independent blue phase liquid crystal Fresnel lens based on phase-separated composite films
Avcı, Nejmettin; Lee, Yuan-Han; Hwang, Shung-June (Taylor & Francis Ltd, 2017)A simple method for fabricating a polarisation independent blue-phase liquid crystal Fresnel lens (BPLCFL) is demonstrated by utilising the photo-polymerisation-induced phase separation. The BPLC/polymer binary Fresnel ... -
Temperature Dependent Current Transport Mechanism of Photopolymer Based Al/NOA60/p-Si MPS Device
Özden, Şadan; Avcı, Nejmettin; Pakma, Osman; Kariper, İ. Afşin (SPRINGER, 2022)A photopolymer based Al/Norland Optical Adhesive 60 (NOA60)/p-Si MPS (metal-polymer-semiconductor) device was fabricated by a combination of vacuum evaporation and smear technique. The current transport properties of the ... -
Viscoelasticity, dielectric anisotropy, and birefringence in the nematic phase of three four-ring bent-core liquid crystals with an L-shaped molecular frame
Avcı, Nejmettin; Borshch, Volodymyr; Sarkar, Dipika Debnath; Deb, Rahul; Venkatesh, Gude; Turiv, Taras; Lavrentovich, Oleg D. (Royal Soc Chemistry, 2013)Molecular shape is an important factor in determining the material properties of thermotropic liquid crystals (LCs). We synthesized and investigated several LC compounds formed by asymmetrically bent molecules with a rigid ...
