نتایج جستجو برای: uv vis drs

تعداد نتایج: 83788  

Journal: :Analytical sciences : the international journal of the Japan Society for Analytical Chemistry 2003
Juan M Bosque-Sendra Eva Almansa-López Ana Ma García-Campaña Luis Cuadros-Rodríguez

The determination of stoichiometries and stability constants of complexes by means of UV-visible spectrophotometry applying traditional methods does not evaluate the quality of the values obtained, since the classic application of these methods does not provide coverage intervals. However, the use of chemometric techniques in different steps of the application of these methods makes it possible...

Journal: :Environmental Technology and Innovation 2021

The magnetite/zinc oxide (Fe3O4/ZnO) nanocomposites were synthesized by the solid-state method using different ratios of zinc and iron oxide. structural, morphological, optical properties analysed X-ray diffraction (XRD), Fourier transform infrared spectra (FT-IR), Raman spectroscopy, transmission electron microscope (TEM), UV–Vis diffuse reflectance (UV–Vis/DRS) Photoluminescence (PL) spectrop...

Journal: :Dalton transactions 2008
Ching-Yao Lin Yen-Chuan Chen Chi-Wen Yao Sung-Chou Huang Yi-Hui Cheng

Two series of free-base and manganese N-methyl-pyridylethynyl-5,15-biphenyl porphyrins were synthesized, and their UV-Visible, electrochemical and spectro-electrochemical properties were studied. Cyclic voltammetry experiments showed positive shifts in the reduction potentials and the UV-Visible spectra showed significant red-shifts in the absorption wavelengths of these porphyrins, indicating ...

2015
Tapan Barman Amreen A. Hussain Bikash Sharma Arup R. Pal

Studies on hot carrier science and technology associated with various types of nanostructures are dominating today's nanotechnology research. Here we report a novel synthesis of polyaniline-gold (PAni-Au) nanocomposite thin films with gold nanostructures (AuNs) of desired shape and size uniformly incorporated in the polymer matrix. According to shape as well as size variation of AuNs, two tunab...

2011
Yongliang Zhuang Liping Sun

Maillard reaction (MR) was carried out in L-lysine-D-glucose (Lys-Glu) model system heated at 120°C for 0 to 10 h without pH control. Optical property (UV-Vis absorbance and fluorescence) development of MR was monitored. Antioxidant activity of maillard reaction products (MRPs) was investigated by a series of in vitro tests. The UV-Vis absorbance zero and first-order derivative spectrophotometr...

Journal: :Catalysts 2023

In this paper, we present the results of a one-pot process for converting, utilizing modified clinoptilolite catalyst. Iron, cobalt, and copper were introduced into zeolite structure as active centers. The catalyst was characterized in terms phase composition, structure, microstructure (using XRD, BET, FT-IR, DRS UV-VIS), well speciation metals. catalytic conducted at temperature 250 °C 1–5 h. ...

Journal: :International Journal of Astrobiology 2006

2007
C. D. Fernandes D. Johnson Monica M. Grady

NASA’s Stardust mission flew through the coma of comet Wild 2 in January 2004, capturing dust grains as it did so. The grains were returned safely to Earth in January 2006, and are in the process of being distributed to investigators. As members of the Spectroscopy Preliminary Examination Team, we are preparing to analyse Stardust grains. Our contribution is to measure the spectrum of the grain...

Metal-organic framework 5 (MOF-5) and bimetallic MOF-5s (Co/Zn and Ni/Zn) were prepared via a simple solvothermal method. Samples were characterized by various techniques such as powder X-ray diffraction (XRD), Fourier transform infrared (FT-IR), scanning electron microscopy (SEM), UV-Vis diffuse reflectance spectroscopy (DRS), inductively coupled plasma (ICP) and elemental analysis (EA). Photo...

Journal: :Catalysts 2021

In order to degrade toxic pollutants such as dyes during the process of sewage treatment, considerable attention has been paid photocatalytic technologies. this paper, TiO2/Ag[BMIM]Cl (1-butyl-3-methyl imidazolium chloride ([BMIM]Cl)) nanocomposites were prepared with TiO2 carrier, silver ions dopants and ionic liquids (IL) modifiers. The morphologies, microstructures, crystalline structure opt...

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