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Synthesis, characterization and biological properties of intercalated kaolinite nanoclays: intercalation and biocompatibility

Yilmaz B., Irmak E. T., Turhan Y., Doğan S., Doğan M., Turhan O.

Advances in Materials Science

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2019

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Vol. 19, nr 1(59)

83--99

EN

The aims of the present study were to synthesize the intercalated kaolinite samples with dimethylsulfoxide (DMSO), glutamic acid (GA), succinimide (SIM), cetylpyridiniumchloride (CPC), and hexadecyltrimethylammoniumchloride (HDTMA+); to characterize by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy-attenuated total reflectance (FTIR-ATR), and to determine the hemocompatibility and the cytotoxic effects of the intercalated kaolinite nanoclays on human lymphocytes. It was found that the intercalation with DMSO did not cause any decrease in cell viability until its maximum concentration (500 μg/mL), however, the intercalation with SIM, CPC, and (HDTMA+) causd important decreases in lymphocyte viabilities. It was determined that no significant decrease was observed in protein content of the lymphocyte cells exposed to the kaolinite nanoclays except the ones intercalated with SIM. Furthermore, the pristine kaolinite nanoclays which were intercalated with DMSO, GA, and SIM exhibited high hemocompatibility and the nanoclays intercalated with CPC and (HDTMA+) were highly hemocompatibile for the amounts below 125 and 500 μg/mL, respectively. All the results of this work can serve for the human risk assesment of intercalated nanoclays.

2

Synthesis, characterization and their antimicrobial activities of boron oxide/poly(Acrylic Acid) nanocomposites: thermal and antimicrobial properties

Beyli P. T., Doğan M., Gündüz Z., Alkan M., Turhan Y.

Advances in Materials Science

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2018

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Vol. 18, nr 1(55)

28--36

EN

Boron oxide (B2O3)/Poly(acrylic acid) (PAA) nanocomposites were synthesized by solution intercalation method, and characterized by Fourier transform infrared spectroscopy (FTIR-ATR), transmission electron microscopy (TEM), X-ray diffraction and thermogravimetric analysis (DTA/TG). The effect of boron oxide amount on the thermal stability of nanocomposites was investigated. Moreover, the antimicrobial activities of them were also determined by the serial dilution method against E. coli and S. aureus. XRD analysis showed that boron oxide was homogenously dispersed in polymer matrix; FTIR-ATR that there was interaction between PAA and boron oxide; and TEM that boron oxide particles had spherical structure, and dispersed in nano size in polymer matrix; DTA/TG that the thermal stability of polymers increased with the adding of boron oxide into polymer matrix, and changed the decomposition mechanism of PAA. B2O3/PAA nanocomposites exhibited higher decomposition temperature. The decomposition mechanisms of PAA and its nanocomposites occurred through three decomposition steps; dehydration, decarboxylation and chain scission. B2O3/PAA nanocomposites showed greater antimicrobial activity with increasing B2O3 amount.

3

Synthesis and characterization of poly(acrylic acid)/organo-modified nanohydroxyapatite nanocomposites: thermal, optical and biocompatibility properties

Diken M. E., Doğan S., Turhan Y., Doğan M.

Advances in Materials Science

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2018

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Vol. 18, nr 3(57)

54--67

EN

The aim of this study was to investigate the structural, thermal, optical and biocompatibility properties of poly(acrylic acid)(PAA)/organo-modified nanohydroxyapatite (OM-nHAp) nanocomposites synthesized by solvent intercalation method. The characterization of PAA/OM-nHAp nanocomposites was made by different techniques. SEM and TEM results showed that OM-nHAp particles were dispersed in the nanoscale into PAA matrix and that they were uniformly distributed within film. Glass transition temperature of PAA increased with OM-nHAp content. Ultraviolet (UV) absorbance experiments showed that PAA had a higher UV transmission than its nanocomposites. The biocompatibility of nanocomposites was also examined in simulated body fluid.

4

Al-Pillared-Montmorillonite (AlPMt)/Poly(Methyl Methacrylate)(PMMA) Nanocomposites: The Effects of Solvent Types and Synthesis Methods

Kizilduman B. K., Alkan M., Doğan M., Turhan Y.

Advances in Materials Science

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2017

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Vol. 17, nr 3(53)

5--23

EN

Al-pillared-montmorillonite (AlPMt)/poly(methyl methacrylate)(PMMA) nanocomposites were synthesized via melt blending method (MBM) and solution blending method (SBM). FTIR-ATR spectroscopy proved the interaction of AlPMt with PMMA polymer matrix. The thermogravimetric and differential scanning calorimeter analyses showed that the thermal stability and the glass transition temperature (Tg) of polymer matrix shifted to higher temperatures with increasing AlPMt content. Images showed that AlPMt dispersed at nanometer scale in polymer matrix. Contact angle measurements demonstrated that the hydrophilicity of the PMMA increased with incorporation of AlPMt. However, the thermal stability of clay/polymer nanocomposites (CPNs) was significantly changed with CPN preparation method.

5

Spectrophotometric determination of iodine by iodine starch method in urine samples after alkaline ashing

Divrikli Ü., Soylak M., Doğan M.

Chemia Analityczna

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2000

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Vol. 45, No. 2

257-264

EN

A spectrophotometric method is proposed for the determination of iodine in urine samples. Destruction of the organic matter of urine by alkaline ashing with KOH is carried out prior to determination of iodine by the iodine-starch method. The influence of components of urine, as interferents, was discussed. The iodine contents of the urine samples collected from adults from Kayseri (Turkey) were determined by using the proposed method. The method was also applied for the determination of iodine in drinking water samples. The relative standard deviations of the iodine determinations were less than 10%. The detection limit of the proposed method was 2.3 ug 1(-1).

PL

Opracowano spektrometryczną metodę oznaczania jodu w próbkach moczu. Do rozkładu substancji organicznych, przed oznaczeniem jodu metodą jodowo-skrobiową, zastosowano alkaliczne spopielanie z użyciem KOH. Przedyskutowano wpływ składników moczu jako substancji przeszkadzających. Opracowaną metodę wykorzystano do oznaczania zawartości jodu w moczu dorosłych osób z miejscowości Kayseri (Turcja). Metodę tę zastosowano także do oznaczania jodu w próbkach wody pitnej. Względne odchylenie standardowe oznaczeń jodu nie przekroczyło 10%. Granica wykrywalności metody wynosi 2.3 ug1(-1).