Yazar "Torabfam, Milad" seçeneğine göre listele

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    A microwave-powered continuous fluidic system for polymer nanocomposite manufacturing: A proof-of-concept study
    (Royal Society of Chemistry, 2022) Torabfam, Milad; Nejatpour, Mona; Fidan, Tuçe; Kurt, Hasan; Yüce, Meral; Bayazıt, Mustafa Kemal
    Continuous manufacturing of pure nanocrystals with a narrow size distribution in a polymer matrix is very challenging, although it is highly crucial to get their full potential for advanced applications. A long-lasting nanocomposite (NC) manufacturing challenge is, for the first time, overcome by a microwave-powered fluidic system (MWFS). The effect of microwave power (MWP), flow rate, and the concentration of the reagents are systematically studied. The nylon-6 NC bearing evenly distributed silver nanoparticles (AgNPs) with a mean size of similar to 2.59 +/- 0.639 nm is manufactured continuously in similar to 2 min at similar to 50-55 degrees C using a green solvent, formic acid. The AgNP size becomes smaller when increasing the polymer concentration gradually. Small NPs with a narrow size distribution are produced at high MWP (40 W), but large ones with a broad size distribution at low MWP (10 W). The nylon-6 crystallinity is NP size-dependent, and the gamma-phase (pseudo-hexagonal crystal) is dominant in the presence of small NPs as against the large counterparts. Given the small-sized AgNPs in the MWF-manufactured NCs, the antibacterial activity tests with Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginosa show superior activity compared to that of the large AgNP-bearing (similar to 50 nm) NCs produced in a conventional heating fluidic system. The proposed MWFS can manufacture other added-value NCs continuously.
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    Aptamer and nanomaterial based FRET biosensors: a review on recent advances (2014–2019)
    (Springer, 2019) Pehlivan, Zeki Semih; Torabfam, Milad; Kurt, Hasan; Ow-Yang, Cleva; Hildebrandt, Niko; Yüce, Meral
    Fluorescence resonance energy transfer, one of the most powerful phenomena for elucidating molecular interactions, has been extensively utilized as a biosensing tool to provide accurate information at the nanoscale. Numerous aptamer- and nanomaterial-based FRET bioassays has been developed for detection of a large variety of molecules. Affinity probes are widely used in biosensors, in which aptamers have emerged as advantageous biorecognition elements, due to their chemical and structural stability. Similarly, optically active nanomaterials offer significant advantages over conventional organic dyes, such as superior photophysical properties, large surface-to-volume ratios, photostability, and longer shelf life. In this report (with 175 references), the use of aptamer-modified nanomaterials as FRET couples is reviewed: quantum dots, upconverting nanoparticles, graphene, reduced graphene oxide, gold nanoparticles, molybdenum disulfide, graphene quantum dots, carbon dots, and metal-organic frameworks. Tabulated summaries provide the reader with useful information on the current state of research in the field.
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    Characterization of biological molecule–loaded nanostructures using circular dichroism and fourier transform infrared spectroscopy
    (Taylor and Francis, 2021) Parlar, Ayhan; Kulabhusan, Prabir Kumar; Kurt, Hasan; Gürel, Büşra; Torabfam, Milad; Özata, Başak; Yüce, Meral
    Drug-loaded nanoparticles have many advantages in drug administration, which is an essential step for the impact of the drugs and their mechanism of action. Circular dichroism (CD) is a spectroscopy technique that measures the absorbance difference between right-circularly polarized light and left-circularly polarized light. Of several analytical techniques available, Fourier transform infrared spectroscopy is a powerful and widely employed technique explicitly for identifying chemical species. The peaks in the IR spectrum of a sample represent the molecular vibrations of the molecules present in the sample, signifying the various chemical bonds and functional groups. Various types of nanoparticles are being utilized for drug delivery applications because of their advantages such as controlled drug release, protection of the therapeutic payload, improved bioavailability, and targeted delivery. The discovery of novel nanoparticles and their application to the diagnosis and treatment of diseases have received considerable attention during the past decades.
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    Functionalized graphitic carbon nitrides for environmental and sensing applications
    (Wiley, 2021) Fidan, Tuçe; Torabfam, Milad; Saleem, Qandeel; Wang, Chao; Kurt, Hasan; Yüce, Meral; Tang, Junwang; Bayazıt, Mustafa Kemal
    Graphitic carbon nitride (g-C3N4) is a metal-free semiconductor that has been widely regarded as a promising candidate for sustainable energy production or storage. In recent years, g-C3N4 has become the center of attention by virtue of its impressive properties, such as being inexpensive, easily fabricable, nontoxic, highly stable, and environment friendly. Herein, the recent research developments related to g-C3N4 are outlined, which sheds light on its future prospective. Various synthetic methods and their impact on the properties of g-C3N4 are detailed, along with discussion on frequently used characterization methods. Different approaches for g-C3N4 surface functionalization, mainly categorized under covalent and noncovalent strategies, are outlined. Moreover, the processing methods of g-C3N4, such as g-C3N4-based thin films, hierarchical, and hybrid structures, are explored. Next, compared with the extensively studied energy-related applications of the modified g-C(3)N(4)s, relatively less-examined areas, such as environmental and sensing, are presented. By highlighting the strong potential of these materials and the existing research gaps, new researchers are encouraged to produce functional g-C3N4-based materials using diverse surface modification and processing routes.
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    Microwave-promoted continuous flow synthesis of thermoplastic polyurethane-silver nanocomposites and their antimicrobial performance
    (Royal Society of Chemistry, 2022) Saleem, Qandeel; Torabfam, Milad; Kurt, Hasan; Yüce, Meral; Bayazıt, Mustafa Kemal
    Thermoplastic polyurethane-silver nanocomposites (PU-Ag NCs) have considerable potential in many medical applications due to their superior mechanical and antimicrobial properties. Herein, a microwave-promoted flow system is successfully employed for continuous in situ manufacturing of PU NCs having spherical silver nanoparticles (AgNPs) without any reducing agent at similar to 40 degrees C in approximately 4 minutes. The main experimental parameters, including microwave power, metal salt concentration, polymer concentration, and flow rate, are optimised for the reproducible synthesis of AgNPs (similar to 5 nm) in the PU matrix, characterised by HRTEM-EDS and DLS analysis. XRD patterns indicate an increase in PU crystallinity with decreased particle size. Conventional heating flow synthesis at similar to 50 degrees C or microwave-batch synthesis (MWB) at similar to 44 and similar to 50 degrees C is ineffective in preparing AgNPs, and only large AgNPs (>100 nm) are synthesised at 70 degrees C in the MWB reactor. PU-Ag NC films bearing small AgNPs (similar to 5 nm) exhibit superior antibacterial activity (>97%) against Escherichia coli, Pseudomonas aeruginosa, and Staphylococcus aureus compared to large NPs (similar to 218 nm). The proposed method may manufacture other metal-polymer matrix composites.
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    Microwave-promoted continuous flow systems in nanoparticle synthesis-A perspective
    (American Chemical Society, 2021) Saleem, Qandeel; Torabfam, Milad; Fidan, Tuçe; Kurt, Hasan; Yüce, Meral; Clarke, Nigel; Bayazıt, Mustafa Kemal
    Microwave-promoted continuous flow systems have emerged as a game-changer in nanoparticle synthesis. Owing to the excellent compatibility between fast, sustainable microwave heating and one-step, efficient flow chemistry, this promising technology is meant to enhance the synthetic abilities of nanoscientists. This Perspective aims to present a panoramic view of the state of the art in this field. Additionally, the effect of various microwave and flow parameters on the properties of nanoparticles is discussed along with a comparative glance at the features that make flow reactors more practical and sustainable than their batch counterparts. The overview has also analyzed various microwave continuous flow reactors available in the literature, with an acute emphasis on the nanosynthesis route and design features. Moreover, a discussion on the numerical modeling of microwave flow systems has been made a part of this perspective to reiterate its significance and encourage research in this domain. The Perspective also briefly comments on existing challenges and future prospects of this technology.
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    Plasmonic titanium nitride nanohole arrays for refractometric sensing
    (American Chemical Society, 2023) Günaydın, Beyza Nur; Gülmez, Mert; Torabfam, Milad; Pehlivan, Zeki Semih; Tütüncüoğlu, Atacan; Kayalan, Cemre Irmak; Saatçioğlu, Erhan; Bayazıt, Mustafa Kemal; Yüce, Meral; Kurt, Hasan
    Group IVB metal nitrides have attracted great interest as alternative plasmonic materials. Among them, titanium nitride (TiN) stands out due to the ease of deposition and relative abundance of Ti compared to those of Zr and Hf metals. Even though they do not have Au or Ag-like plasmonic characteristics, they offer many advantages, from high mechanical stability to refractory behavior and complementary metal oxide semiconductor-compatible fabrication to tunable electrical/optical properties. In this study, we utilized reactive RF magnetron sputtering to deposit plasmonic TiN thin films. The flow rate and ratio of Ar/N2 and oxygen scavenging methods were optimized to improve the plasmonic performance of TiN thin films. The stoichiometry and structure of the TiN thin films were thoroughly investigated to assess the viability of the optimized operation procedures. To assess the plasmonic performance of TiN thin films, periodic nanohole arrays were perforated on TiN thin films by using electron beam lithography and reactive ion etching methods. The resulting TiN periodic nanohole array with varying periods was investigated by using a custom microspectroscopy setup for both reflection and transmission characteristics in various media to underline the efficacy of TiN for refractometric sensing.