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Modyfikator właściwości epoksydowych kompozycji powłokowych. Otrzymywanie i charakterystyka

Wierzbicka Ewa, Kugler Szymon, Ossowicz Paula, Malarczyk-Matusiak Kornelia

Inżynieria Materiałowa

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2020

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Vol. 41, nr 5

12--16

PL

Wytworzono modyfikatory na bazie haloizytu. Przedmiotowy minerał o strukturze warstwowo-rurkowej poddano modyfikacji fizyko-chemicznej z zastosowaniem fal pola ultradźwiękowego oraz 8-hydroksychinoliny. Analiza struktury (SEM), powierzchni (EDS) oraz wyniki badań właściwości termicznych (TGA) potwierdziły nanometryczną, hybrydową strukturę otrzymanych nanonapełniaczy. Oczekiwany efekt modyfikacji haloizytu potwierdziło również badanie metodą niskotemperaturowej adsorpcji azotu (BET). Wstępne próby napełniania epoksydowych kompozycji powłokowych otrzymanym nanonapełniaczem wykazały poprawę właściwości użytkowych uzyskanych spoiw, w tym tłoczności i twardości.

EN

Modifiers based on halloysite were produced. The mineral with a layered and tube structure was subjected to physico-chemical modification using ultrasonic field waves and 8-hydroxyquinoline. The analysis of the structure (SEM), surface (EDS), moreover the results of the thermal analysis (TGA) confirmed nanometric hybrid structure of obtained nanofillers. Low-temperature nitrogen adsorption test providing important information on porous structure of tested nanofillers, additionally confirmed the effect of modification. Preliminary tests of filling epoxy coating compositions with the obtained nanofiller showed an improvement in the functional properties of the obtained binders.

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Preparation, quality control and biodistribution studies of [61Cu]-oxinate for PET tumor imaging

Jalilian A. R., Zolghadri S., Faghihi R., Yousefnia H., Garousi J., Shafaii K., Bolourinovin F.

Nukleonika

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2009

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Vol. 54, No. 3

175-179

EN

Targeting apoptosis is an interesting issue in molecular imaging and various modalities have been presented. However, recent experiences in nuclear pharmacy demonstrated the application of small tracer molecules is more desired. This work was conducted for production of a radiolabeled copper complex, i.e. 61Cu-oxinate as a potential PET tracer for apoptosis imaging in oncology. Cu-61 was prepared by natural zinc target irradiation with 22 MeV protons (150 miA) via the natZn(p, xn)61Cu nuclear reaction with a yield of 3.33 mCi/miAh. In order to obtain the best labeling method, optimization reactions were performed for pH, temperature and concentration followed by solid phase extraction. Biodistribution of the tracer was studied in wild-type and fibrosarcoma bearing mice. Under the optimized conditions, radio-thin-layer chromatography (RTLC) and HPLC showed radiochemical purities of 99.99% and 97% respectively (with a minimum specific activity of 16 Ci/mM). Biodistribution of the tracer in fibrosarcoma bearing mice demonstrated a significant tumor uptake after 3 h. Tumor:blood and tumor:muscle ratios were 2.0 and 6.0 after 3 h, respectively.

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Oxidative Polymerization Studies of 8-Hydroxyquinoline in Different Media

Ahmed S. M., Ahmed S. A.

Polish Journal of Chemistry

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2007

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Vol. 81, nr 12

2195-2205

EN

Oxidative polymerization reaction of 8-hydroxyquinoline (HQ) in different media has been studied experimentally by spectrophotometric technique and confirmed computationally by molecular mechanics (MM+) calculations. MM+ calculations showed that the PE of the optimum molecular geometric (OMG) of the anionic HQ (HQ-NaOH) form is about two (1.985) times greater than the PE in the protonated (HQ-HCl) form. PE of the OMG structure of the PHQ was computed (-30.651 kJ mol-1). These calculations indicate that the matrix is highly stable. The oxidation constant (Kox) of the anionic form (HQ-NaOH) is about twice (2.02) greater than that of the protonated (HQ-H2SO4) form. The proposed procedure was success fully applied for the oxida tion of diiodohydroxyquinoline in streptoquin (SQ) (anti-di ar rhea, tab lets). The Kox of HQ in SQ was also found to be lower than the Kox in synthetic (HQ) solution. Kinetic parameters of the oxidative polymerization of the anionic form of HQ (HQ-NaOH) were deduced on the basis of absorbance variations. The results of computer-oriented kinetic analysis indicate that the rate-controlling step of the HQ polymerization is governed by Ginstling-Bronstein equation representing the three-dimensional diffusion (D4). Activation parameters of the oxidative polymerization of the anionic form of HQ (HQ-NaOH) were computed and discussed.

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Metal Complexes of C-Functionalized Macrocyclic Dioxotetraamines Bearing 8-Hydroxyquinoline Stability in Aqueous Solutions

Su X., Zhu S. -R., Sun W., Zhao G. -H., Chen Y. -T.

Polish Journal of Chemistry

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2001

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Vol. 75, nr 5

623--632

EN

Two novel 8-hydroxyquinoline connected dioxotetraamines have been designed and synthesized, and have been characterized by elemental analysis, IR, mass spectra and 1H NMR. The two ligands L1 and L2 have two chelating groups. Each can react with a transition metal ion forming complexes. Potentiometric titrations have been performed in 0.1 mol/L NaNO3 at 25_C giving the 1:1 stability constants. Coupled with UV spectroscopy the affinity of 8-hydroxyquinoline and dioxotetraamines to transition metal ions were compared and the possible structure of the metal complex species in solution was discussed. The results show that as to Mn2+, Zn2+ and Co2+, 8-hydroxyquinoline is a stronger chelating reagent than dioxo[13] or [14]tetraamine macrocycles and at 1:1 molar ratio (M:L), the former binds in 100% to the metal ions, while the dioxotetraamines can be only partially or not coordinated.