scholarly journals Influence of Impurities on the Luminescence of Er3+Doped BaTiO3Nanophosphors

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
G. D. Webler ◽  
M. J. M. Zapata ◽  
G. S. Maciel ◽  
A. Patra ◽  
J. M. Hickmann ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Barium Titanate ◽  
Powder Diffraction ◽  
Barium Carbonate ◽  
X Ray ◽  
Luminescence Efficiency ◽  
Emulsion Gel ◽  
Low Levels ◽  
Influence Of Impurities

The influence of the presence of barium carbonate (BaCO3) phase on the luminescence properties of barium titanate nanocrystals (BaTiO3) powders was investigated. Structural and optical characterizations of erbium (Er3+) doped BaTiO3synthesized by the sol-emulsion-gel were performed. Using Fourier transform infrared spectroscopy and X-ray powder diffraction, we identified the presence of impurities related to BaCO3and quantified its fraction. It was observed that the presence of BaCO3phase, even at low levels, depletes significantly the infrared-to-visible upconverted luminescence efficiency of the produced nanopowders.

Improved Crystallinity of Zinc Sulfide Nanoparticles in Aqueous Environment

2005 ◽  
Vol 879 ◽  
Author(s):  
Navendu Goswami ◽  
P. Sen
Keyword(s):  
Particle Size ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Zinc Sulfide ◽  
Structural Transformation ◽  
Powder Diffraction ◽  
Aqueous Environment ◽  
X Ray ◽  
Zinc Sulfide Nanoparticles

AbstractZinc sulfide nanoparticles, prepared employing a non-equilibrium route, are investigated for surface related effects. Water has been shown to induce a structural transformation in nanoparticles prepared this way, which is not related to their particle size. Employing Fourier transform infrared spectroscopy and x-ray powder diffraction, we show here the importance of S-H interaction in the buildup to the final ZnS structure of these nanoparticles. These particles hold promise as water sensors.

scholarly journals Adsorption of Uranium (VI) from Aqueous Solutions by Amino-functionalized Clay Minerals

2019 ◽  
Vol 3 (1) ◽  
pp. 41 ◽  
Author(s):  
Victoria Tobilko ◽  
Larysa Spasonova ◽  
Iryna Kovalchuk ◽  
Borys Kornilovych ◽  
Yurij Kholodko
Keyword(s):  
Thermal Analysis ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Clay Minerals ◽  
Powder Diffraction ◽  
Nitrogen Adsorption ◽  
Layer Silicate ◽  
X Ray ◽  
Modified Montmorillonite ◽  
Adsorption Desorption

Silylation of clay minerals from Cherkasy deposit (Ukraine) montmorillonite (layer silicate) and palygorskite (fibrous silicate) was performed using organosilane (3-aminopropyl)triethoxysilane (APTES). Solvents with different polarity (ethanol, toluene) were used in synthesis. The structure of modified minerals was characterized by complex of methods (X-ray powder diffraction, Fourier transform infrared spectroscopy, nitrogen adsorption-desorption at −196 °C and thermal analysis). Studies of adsorption characteristics of APTES-modified clay minerals were carried out in relation to uranium (VI). The results indicated that modified montmorillonite and palygorskite were effective materials for water purification from UO22+.

Crystallization of Aragonite from Vaterite Precursor during Various Refluxing Times

2015 ◽  
Vol 1119 ◽  
pp. 466-470 ◽  
Author(s):  
Radek Ševčík ◽  
Petra Mácová ◽  
Marta Pérez-Estébanez
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Powder Diffraction ◽  
X Ray ◽  
Gradual Transformation ◽  
Scanning Electron

CaCO3 polymorphs are intensively studied due to their importance in the nature and the widespread use in the industry as well. This work is dealing with the crystallization of aragonite from vaterite dispersion during the refluxation at 100°C. The characterization of CaCO3 polymorphs during vaterite transformation was performed with Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and X-ray powder diffraction (XRPD). The influence of the different refluxing times on the aragonite crystallization was discussed. The purest aragonite, 70.7(2) wt.%, was synthetized in the sample refluxed for 60 minutes. Prolonged refluxation strongly affected aragonite crystals with gradual transformation into calcite.

Solvent-Induced Crystallization of Polyarylene Sulfide Sulfone

2015 ◽  
Vol 815 ◽  
pp. 529-533
Author(s):  
Su Ying Li ◽  
Yue Wu Gong ◽  
Sheng Ru Long ◽  
Xiao Jun Wang ◽  
Jie Yang
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Thermogravimetric Analysis ◽  
Powder Diffraction ◽  
Induction Time ◽  
Crystallization Behavior ◽  
Crystal Size ◽  
Crystalline Region ◽  
X Ray ◽  
Induced Crystallization

In this paper, N-methyl-2-pyrrolidone (NMP) induced crystallization behavior of PASS was found and studied. To study NMP induced crystallization of PASS, Differential Scanning Calorimeter (DSC), X-Ray Powder Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Thermogravimetric Analysis (TGA) were employed. The results showed that the crystal induced by NMP was consistent with precipitates obtained in solution, and was the eutectic of PASS and NMP. With the induction time increased, crystalline region continued to improve and the crystal size became bigger.

scholarly journals Pengaruh Jumlah Polimer terhadap Karakteristik Fisik dan Pelepasan Nanopartikel Fraksi Diterpen Lakton Sambiloto - Kitosan

2020 ◽  
Vol 7 (2) ◽  
pp. 99
Author(s):  
Retno Sari ◽  
Abhimata Paramanandana ◽  
Dewi Isadiartuti ◽  
Annisa Maulidia Rahayyu
Keyword(s):  
Thermal Analysis ◽  
Fourier Transform ◽  
Differential Thermal Analysis ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Powder Diffraction ◽  
Fourier Transform Infrared ◽  
Andrographis Paniculata ◽  
X Ray

Fraksi diterpen lakton dari Andrographis paniculata Nees (sambiloto) (FDTLS) memiliki kandungan utama andrografolid. andrografolid diketahui memiliki bioavailabilitas buruk, bersifat sangat lipofilik, dan memiliki kelarutan yang rendah di dalam air. Penjebakan bahan sukar larut ke dalam polimer hidrofilik seperti kitosan dapat memperbaiki disolusi yang selanjutnya akan meningkatkan bioavailabilitas dan efektivitasnya. Tujuan penelitian ini adalah untuk meningkatkan disolusi serta mengetahui pengaruh jumlah kitosan terhadap karakteristik fisik, efisiensi penjebakan dan pelepasan FDTLS dari nanopartikel FDTLS-kitosan. Nanopartikel dibuat dengan metode gelasi ionik-semprot kering menggunakan tripolifosfat sebagai penyambung silang. Nanopartikel dibuat dengan rasio FDTLS-kitosan yang berbeda, yaitu 1:2 (FK1), 1:2,5 (FK2) dan 1:3 (FK3). Evaluasi yang dilakukan meliputi morfologi, pemeriksaan differential thermal analysis (DTA), Fourier-transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), efisiensi penjebakan, dan uji pelepasan. Nanopartikel yang dihasilkan berbentuk sferis dan FK2 mempunyai permukaan paling halus dengan entalpi paling tinggi. Difraktogram nanopartikel FDTLS-kitosan menunjukkan perubahan kristalinitas menjadi lebih amorf. Efisiensi penjerapan FDTLS dalam nanopartikel kitosan sebesar 29,01-32,69%. Hasil uji pelepasan nanopartikel menunjukkan peningkatan kecepatan FDTLS terlarut sebesar 1,6 kali dibandingkan dengan substansi FDTLS. Dari hasil penelitian dapat disimpulkan bahwa pembentukan nanopartikel dengan polimer kitosan dengan metode gelasi ionik-semprot kering dapat meningkatkan jumlah FDTLS terlarut.

Effect of Manual Grinding on Diclofenac Acid Nanocrystals: A Chemico-Physical Investigation

2021 ◽  
Vol 21 (5) ◽  
pp. 2808-2815
Author(s):  
Alessandra Scano ◽  
Francesco Lai ◽  
Francesca Marongiu ◽  
Guido Ennas
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Powder Diffraction ◽  
Crystal Size ◽  
Molecular Conformation ◽  
Grinding Process ◽  
Physical Investigation ◽  
X Ray ◽  
Metastable Form

X-ray Powder Diffraction, Fourier Transform Infrared Spectroscopy and Differential Scanning Calorimeter were used to study the effect of the manual grinding in an agate mortar of the diclofenac acid polymorphs HD1 and HD2. In particular, we have tried to highlight how the HD2 form is more sensitive than the HD1 to the grinding process to achieve a nanometric crystal size. HD1 shows no change, while in the case of the HD2, changes in the molecular conformation and the formation of a new metastable form of the polymorph are observed after grinding.

Multidisciplinary Investigations of a Double Sided Wooden Icon from Nicula Monastery, Romania

2019 ◽  
Vol 70 (8) ◽  
pp. 2747-2752
Author(s):  
Constantin Marutoiu ◽  
Ioan Bratu ◽  
Mircea Gelu Buta ◽  
Olivia Florena Nemes ◽  
Sergiu Petru Timbus(Monk Siluan) ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Fourier Transform Infrared ◽  
Spectroscopic Methods ◽  
X Ray ◽  
Painting Materials ◽  
The Status

A two-sided wooden icon from a monastery in Transylvania was submitted for multidisciplinary investigations involving X-Ray Fluorescence, Radiographic Photographyand Fourier Transform Infrared Spectroscopy. The most important part of the icon is St. Nicholas wooden icon, painted over forty years ago. The spectroscopic methods used revealed the painting materials composition, the status of the wooden stage, and the presence of resins as varnish (Fourier Transform Infrared Spectroscopy). On one side, the St Nicholasicon was painted over an old icon, St. Arch. Michael, which was evidenced by X-Ray Photography. The obtained data can serve for the preservation and the restoration of these wooden icons.

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