+2 Metal Katkılanmış Fe3o4 Nanoparçacıkların Sentezi Ve Karakterizasyonu

Proje kapsamında gerçekleştirilecek olan bu çalışmada +2 Metal Katkılanmış Fe3O4 Nanoparçacıkların Sentezi ve Karakterizasyonu yapılmıştır. Metal katkılanmış genel formülü MxFe1-XFe2O4 olan manyetik nanomalzemeler, bir bakımıyla yarı metalik özellik gösterdiği için ne metal ne de ametal özellik göstermektedir Bu malzemeler birçok uygulama alanı ile günümüzde büyük bir öneme sahiptir. Manyetit tetrahedral boşluklarında Fe+3 oktahedral boşluklarında ise hem Fe+2 hem Fe+3 iyonunun bulunduğu ters spinel yapıda bir malzemedir. Bu yüzden nanoferritlerin özellikleri dopant cinsine ve miktarına göre ayrıca malzemedeki katyon değişimi düşünülerek modifiye ya da optimize edilebilir. Bu proje kapsamında manyetite +2 yükte farklı metal iyonları (Ni2+, Mn2+ ve Co2+) yüklü katyonlarla katkılanmış manyetit (Fe3O4) nanoparçacıklarının sentezi ve karakterizasyonu yapılmıştır. Bu sentez işlemleri için hidrotermal sentez, polyol, mikrodalga ve birlikte çöktürme gibi çeşitli yöntemler kullanılmıştır. Ayrıca Mössbauer spektropi analizi ve katyon dağılım hesaplamaları ile yapıdaki tüm iyonların varlığı detaylı olarak tespit edilmiştir.. Bu arada M2+ yüklü metal iyonu katkılanarak elde edilen Fe3O4 nanoparçacığının manyetik özellikleri VSM tekniği ile de analiz edilmiştir.In this project, synthesis and characterization of +2 Metal-doped Fe3O4 Nanoparticles were done. The magnetic nanomaterials with the metal-doped general formula MxFe1XFe2O4 exhibit neither metalic nor ametalic properties due to their semi-metallic character. Nowadays, these materials have a great suggestion with many applications. In magnetite tetrahedral cavities, Fe+3 octahedral cavities where both Fe+2 and Fe +3 ions are a material in the reverse spinel structure. Therefore, the properties of nanoferrites can be modified or optimized depending on the nature and amount of dopant, as well as cation exchange in the material. In this project, the synthesis and characterization of magnetite (Fe3O4) nanoparticles doped with +2 charge different metal ions (Ni2+, Mn2+ and Co2+) on the magnetite compound have been made. The different methods such as hydrothermal synthesis, polyol, microwave and co-precipitation have been used for this synthesis. In addition, Mössbauer spectropy analysis and cation distribution calculations were used to determine the presence of all ions in the structure in detail. Meanwhile, the magnetic properties of Fe3O4 nanoparticles obtained by doping M2 + loaded metal ions were also analyzed by VSM technique

Synthesis and Characterization of Carboxylated Luteolin (CL)-Functionalized SPION

In this study, a stable carboxylated luteolin (CL)-functionalized superparamagnetic iron oxide nanoparticle (SPION) as a potential drug carrier for in vitro analysis of L929 (mouse fibroblast), U87 (glioblastoma (brain cancer)), MCF-7 (breast cancer), HeLa (cervix cancer), and A549 (human lung cancer) cell lines has been synthesized. Thermal decomposition and Stober methods were used to prepare 3-aminopropyl triethoxysilane-capped SPIONs respectively. Carboxylated polyethylene glycol (PEG-COOH), folic acid (FA), and CL were conjugated on the surface via a carboxylic/amine group using the nanoprecipitation method respectively. Internalization of CL-functionalized SPION and the release of luteolin from it has been studied using Prussian blue staining and spectrophotometry respectively. The cytotoxicity of CL-functionalized SPION on cell lines was tested by MTT assay. Internalization of product by HeLa, MCF-7, and U87 was higher than A549 and L929 cells. It was observed that luteolin release increased in an acidic environment (pH 5.4). A newly synthesized SPION-FA-PEG in all concentrations (except 500 mu g/mL) did not show notable toxicity against L929, U87, MCF-7, HeLa, and A549. However, the product in all used concentrations decreased cell viability at the 24th and 48th hours. This study confirmed that the product has a potential to be used as an anti-cancer CL-functionalized SPION for targeted drug delivery

Structural characterization and vibrational studies of human urinary stones from Istanbul, Turkey

Seven human urinary stones were collected from urinary bladders of patients hailing from Istanbul, Turkey. Their XRD, EDX, FT-IR and FT-Raman spectra as well as SEM images have been recorded to determine their chemical compositions, morphologies, crystal structures, and crystallite sizes. XRD and vibrational (FT-IR and FT-Raman) analyses indicate that six out of the seven stones have identical contents. The ratios of organic and inorganic contents of the stones have been determined by their thermogravimetric analyses. The stones have been found to contain calcium oxalate monohydrate and apatite as the major components. (C) 2016 Elsevier B.V. All rights reserved

Synthesis of magnetically recyclable MnFe2O4@SiO2@Ag nanocatalyst: Its high catalytic performances for azo dyes and nitro compounds reduction

In this study, magnetically recycable MnFe2O4@SiO2@Ag nanocatalyst (MnFe2O4@SiO2@Ag MRCs) has been synthesized through co-precipition and chemical reduction method. XRD analysis confirmed the synthesis of single phase nanoproduct with crystallite size of 10 nm. VSM measurements showed the superparamagnetic property of the product. Catalytic studies showed that MnFe2O4@SiO2@Ag MRC could catalyze the reduction of the various azo compounds like methyl orange (MO), methylene blue (MB), eosin Y (EY), and rhodamine B (RhB) and also aromatic nitro compounds such as 4-nitrophenol (4-NP), 4-nitroaniline (4-NA) and 2-nitroaniline (2-NA). Moreover, the magnetic nanocatalyst showed an excellent reusability properties that remained unchanged after several cycles. Therefore, MnFe2O4@SiO2@Ag is the potential candidate for the application of organic pollutants for wastewater treatment. (C) 2016 Elsevier B.V. All rights reserved

Magneto-optical and catalytic properties of Fe3O4@HA@Ag magnetic nanocomposite

Fe3O4@HA@Ag magnetic nanocomposites (MNCs) were successfully synthesized by the simple reflux method for the removal of azo dyes from the industrial aqueous media. Fe3O4@HA@AgMNCs exhibited high catalytic activity to reduce MB within 20 min from the waste water. The obtained materials were characterized by the means of different techniques. Powder X-ray diffraction(XRD) analysis confirmed the single-phase of Fe3O4 spinel structure. SEM and TEM analysis indicated that Fe3O4@HA@AgMNCs were nanoparticles like structure with small agglomeration. TG result showed that the products contained 9% of HA. The characteristic peaks of HA at 1601 cm(1) and 1703 cm(1) was observed by the means of FT-IR spectra of Fe3O4@HA@AgMNCs. The hysteresis(sigma-H) curves revealed Fe3O4@HA@AgMNCs exhibit a typical superparamagnetic characteristic with a saturation magnetization of 59.11 emu/g and measured magnetic moment is 2.45 mu(B). The average magnetic particle dimension(D-mag) is 13.25 nm. In accordance, the average crystallite and particle dimensions were obtained as 11.50 nm and 13.10 nm from XRD and TEM measurements, respectively. Magnetocrystalline anisotropy was offered as uniaxial and calculated effective anisotropy constant(K-eff) is 2.96 x 10(5) Erg/g. The blocking temperature was estimated as 522K. The size-dependent saturation magnetization suggests the existence of a magnetically dead layer as 0.793 nm for Fe3O4@HA@AgMNCs. The UV-vis diffuse reflectance spectroscopy (DRS) and Kubelka-Munk theory were applied to determine the optical properties of powder samples. The direct optical energy band gap(E-g) values were estimated from Tauc plots between 1.62 eV and 2.12 eV. (c) 2016 Elsevier B.V. All rights reserved.Fatih University Research officeFatih University [P50031504_B (10790)]; Turkish Research Council (TUBITAK)Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [2215]This study was supported by Fatih University Research office with the project number: P50031504_B (10790). Md. Amir is also thanks to the Turkish Research Council (TUBITAK) for his master studies and for Foreign students scholarship program of 2215

Adsorption of industrial Acid Red 114 onto Fe3O4@ Histidine magnetic nanocomposite

Fe3O4@ Histidine (Fe3O4@ His) magnetic nanocomposite (MNCs) was successfully prepared by simple thermal decomposition method. The final obtained products were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR), thermogravimetric analysis, scanning electron microscope (SEM), and transmission electron microscopy (TEM). Powder XRD analysis confirmed the single phase of Fe3O4 spinel structure. SEM and TEM analysis indicated that Fe3O4@ His MNCs were nanoparticles-like structure with small agglomeration. FT-IR results revealed that L-histidine made a bond through its COO-group with Fe3O4 Nanoparticles (NPs). There is electrostatic attraction between cationic NH2 group (NH3+) of Fe3O4@ His MNCs and anionic dye. The Fe3O4@ His MNC has much higher adsorbed amount of Acid Red 114 (AR114) than the Fe3O4 NPs at pH 5 and 8. At pH -5 on the nanoparticle surface via ammonium groups. Thermal analysis showed the decomposition of the L-histidine capping. The hysteresis (sigma-H) curves revealed Fe3O4@ His MNC exhibit a typical super paramagnetic characteristic with a saturation magnetization of 45.5 emu/g. The adsorption capacity of low-cost and eco-friendly adsorbents Fe3O4@ His nanocomposite for removal of industrial AR114 from wastewater was investigated. Therefore, pH of 5 and contact time of 120 min were found to be optimum for maximum removal of AR114 by Fe3O4@ His MNCs. The experimental data of adsorption obey Langmuir isotherm and pseudo-second-order kinetic. The maximum adsorption capacity of the Fe3O4@ His MNC for AR114 was 140.8 mg/g at pH 5. The reusability of the Fe3O4@ His MNCs was also done, and significant removal of AR114 obtained even after five cycles. Thus, Fe3O4@ His MNCs considered as a good stability and reusability absorbent for the removal of industrial AR114.Fatih University Research office [P50031504_B (10790)]This study was supported by Fatih University Research office with the project number: P50031504_B (10790)

Electrical and Dielectric Characterization of Bi-La Ion-Substituted Barium Hexaferrites

BaLa (x) Bi (x) Fe12-2xO19 (0.0 ae x ae 0.5) hexaferrites were produced by solid-state synthesis route, and the effect of Bi3+ and La3+ substitutions on electrical and dielectric properties of barium hexaferrite material were investigated. It is noticed that ac conductivity of barium (BaM) increases slightly with ionic substitutions of both La3+ and Bi3+ and then decreases. Ac conductivity is increased with increasing frequency at lower temperatures then remains constant for higher temperatures. This type of conductivity attitude could be originated from the indication of both electronics and polaron hopping mechanisms. The dielectric properties of BaLa (x) Bi (x) Fe12-2xO19 (0.0 ae x ae 0.5) hexaferrites represent a very interesting tunability as functions of frequency, temperature, and Bi3+ and La3+ ions

Impacts of Sol-Gel Auto-Combustion and Ultrasonication Approaches on Structural, Magnetic, and Optical Properties of Sm-Tm Co-Substituted Sr0.5Ba0.5Fe12O19 Nanohexaferrites : Comparative Study

In this paper, we introduced a comparative study of Sm-Tm-substituted Sr-Ba nanohexaferrites (NHFs), Sr0.5Ba0.5TmxSmxFe12-2xO19 with x = 0.00-0.05, manufactured via both citrate sol-gel auto-combustion and ultrasonication approaches. The phase formation of M-type hexaferrite (HF) for both compositions was confirmed by X-ray diffraction (XRD) powder pattern, Fourier-transform infrared (FT-IR) spectra, scanning and transmission electron microscopy (SEM and TEM) micrographs, energy dispersive X-ray (EDX) spectra, and elemental mappings. The magnetic properties at room temperature (RT) and low temperature (T = 10 K) were also investigated. M-H loops revealed ferrimagnetic nature for various prepared nanohexaferrites via sol-gel and ultrasonication routes. The M-s (saturation magnetization) and M-r (remanence) values increased with increasing Tm-Sm substituting contents. M-s and M-r reached their maximum values at x = 0.04 in the case of samples prepared using the sol-gel technique and at x = 0.03 for those prepared via ultrasonication route. M-H loops were very broad in samples prepared via ultrasonication route in comparison to those produced by means of the sol-gel approach, implying that the products synthesized via ultrasonication route have greater values of coercivity (H-c). The variations in H-c values with respect to Tm-Sm substitutions were governed by the evolutions in the magneto-crystalline anisotropy. Diffuse reflectance spectra (DRS) were employed to estimate the direct band gap of pristine and co-substituted Sr0.5Ba0.5Fe12O19 hexaferrites. Optical energy band gaps (E-g) of pristine samples were significantly tuned by co-substitution of Tm3+ and Sm3+ ions. E-g values of the Sr0.5Ba0.5Fe12O19 sample, which was synthesized using the sol-gel method, decreased almost linearly from 1.75 to 1.45 eV by increasing co-doped ion content. However, we observed a sharp drop from 1.85 eV to an average of 1.50 eV for the samples, which were synthesized using the ultrasonication approach

Triethylene Glycol Stabilized CoFe2O4 Nanoparticles

We report on the synthesis and detailed composition, thermal, micro-structural, ac-dc conductivity performance and dielectric permittivity characterization of triethylene glycol (TREG) stabilized CoFe2O4 nanoparticles synthesized by polyol method. XRD analysis confirmed the inorganic phase as CoFe2O4 with high phase purity. Microstructure analysis with TEM revealed well separated, spherical nanoparticles in the order of 6 nm, which is also confirmed by X-ray line profile fitting. FT-IR analysis confirms that TREG is successfully coated on the surface of nanoparticles. Overall conductivity of nanocomposite is approximately two magnitudes lower than that of TREG with increase in temperature. The ac conductivity showed a temperature dependent behavior at low frequencies and temperature independent behavior at high frequencies which is an indication of ionic conductivity. The dc conductivity of the nanocomposites and pure TREG are found to obey the Arrhenius plot with dc activation energies of 0.258 eV and 0.132 eV, respectively. Analysis of dielectric permittivity functions suggests that ionic and polymer segmental motions are strongly coupled in the nanocomposite. TREG stabilized CoFe2O4 nanoparticles has lower epsilon' and epsilon '' than that of pure TREG due to the doping of cobalt. As the temperature increases, the frequency at which (epsilon '') reaches a maximum shifted towards higher frequencies. On the other hand, the activation energy of TREG for relaxation process was found to be 0.952 eV which indicates the predominance of electronic conduction due to the chemical nature of TREG. Contrarily, no maximum peak of tan delta was observed for the nanocomposite due to the being out of temperature and frequency range applied in the study

Investigation of Structural and Magnetic Properties on Mg1-xZnxFe2-xAlxO4 (0.0 <= x <= 0.8) Nanoparticles

A mixed spinel ferrite nanoparticle, Mg1−xZnxFe2−xAlxO4 NPs (0.0 ≤ x ≤ 0.8), were synthesized effectively by co-precipitation method and sintered at 600 °C for 10 h. The structural and magnetic properties of the products were studied through X-ray powder diffraction (XRD), scanning electron microscopy, transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM) and vibrating sample magnetometer. The cubic spinel phase was confirmed by XRDs with particle size between 24.5 and 40.2 nm. The lattice parameters for the products are increased with increasing the Zn2+ and Al3+ ratio due to the successfully integrated into the cubic system without changing the original structure. Although it was observed from the cation distributions, that the cubic phase is was an inverse spinel, wherein which the Fe3+ and Mg2+ ions occupied both the tetrahedral A and octahedral B- sites, the Zn2+ ions preferred to occupy the A- sites and Al3+ occupy preferred the B -sites. The morphology of the nanoparticles NPs detailed was using TEM, HR-TEM, and SAED in selected area confirmed the particle size and crystalline spinel structure. Magnetization results at room temperature presents a narrow hysteresis loop for all ratios, which is specific of the soft magnetic materials. Also, we noticed that the increase in the magnetization with increasing the ratio of Zn2+ and Al3+ consistent with the enhancement of crystallinity. Moreover, we found that the saturation magnetization, coercively and remanent for Mg1−xZnxFe2−xAlxO4 where x = 0.6 sample is the highest, indicating the potential of Zn and Al substitution in enhancing the magnetic properties of magnesium ferrite. According to AC magnetic susceptibility measurements, the nanoparticles exhibit superparamagnetic/spin glassy behaviour with a very strong inter-nanoparticles interaction. Additionally, AC susceptibility measurements indicated a relative sensitivity of samples to the variation of applied frequency, which is an important result for the applications in hyperthermia based therapy. This is the first study in which both Zn2+ and Al3+ ions with varying concentration were tried to substitute into MgFe2O4 simultaneously and their effects on magnetic properties of MgFe2O4 was investigated