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Gallium oxides are of broad interest due to their wide band gaps and attractive photoelectric properties. Typically, the synthesis of gallium oxide nanoparticles is based on a combination of solvent-based methods and subsequent calcination, but detailed information about solvent based formation processes is lacking, and this limits the tailoring of materials. Here we have examined the formation mechanisms and crystal structure transformations of gallium oxides during solvothermal synthesis using X-ray diffraction. γ-GaO readily forms over a wide range of conditions. In contrast, β-GaO only forms at high temperatures ( > 300 °C), and it is always preceded by γ-GaO, indicating that γ-GaO is a crucial part of the formation mechanism of β-GaO. The activation energy for formation of β-GaO from γ-GaO is determined to be 90-100 kJ mol in ethanol, water and aqueous NaOH based on kinetic modelling of phase fractions obtained from multi-temperature X-ray diffraction data. At low temperatures GaOOH and GaOOH form in aqueous solvent, but these phases are also obtained from γ-GaO. Systematic exploration of synthesis parameters such as temperature, heating rate, solvent and reaction time reveal that they all affect the resulting product. In general, the solvent based reaction paths are different from reports on solid state calcination studies. This underlines that the solvent is an active part of the solvothermal reactions and to a high degree determines different formation mechanisms.
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http://dx.doi.org/10.1039/d2nr07128b | DOI Listing |
Naunyn Schmiedebergs Arch Pharmacol
December 2024
Department of Pharmaceutical Sciences and Technology, Birla Institute of Technology, Mesra, Ranchi, Jharkhand, India.
Idiopathic pulmonary fibrosis (IPF) is a severe and progressive lung disorder with an average survival rate of 3 to 5 years. IPF presents a significant challenge in clinical management, necessitating novel therapeutic approaches. Nanostructured lipid carriers (NLCs) have proven to be promising vehicles for targeted drug delivery to the lung tissues.
View Article and Find Full Text PDFMikrochim Acta
December 2024
Chemistry Department, Faculty of Science, Tanta University, Tanta, Egypt.
The detection of 4-chloro-2-methylphenoxyacetic acid (CMPA) herbicide is crucial due to the potential health risks linked to exposure through drinking water, air, and food, which may adversely affect liver and kidney functions. To address this environmental concern and promote sustainable agriculture, a sensitive carbon paste sensor incorporating a composite material was developed. The composite sensor is based on porous cobalt-1,4-benzenedicarboxylate metal-organic framework and exfoliated montmorillonite nanolayers (Co-OF/MMt).
View Article and Find Full Text PDFPharm Dev Technol
December 2024
Professor & Principal, Brilliant Grammar School Educational Society's Group Of Institutions- Integrated Campus (Faculty Of Engineering and Faculty Of Pharmacy), Hyderabad. Abdullapur (V), Abdullapurmet (M), Rangareddy (Dist), Hyderabad-501505, Telangana, India.
The natural flavonoid Quercetin (QT) showed a potential for various health benefits, but its pharmaceutical applications are hindered by low solubility, permeability, and limited bioavailability. This research aimed to synthesize, develop and optimize polylactic acid co-glycolic acid (PLGA) nanobubbles using solvent evaporation method as a sustained delivery system for QT, thus improving stability and bioavailability. Through a four-factor, three-level Box Behnken Design, 29 experimental runs were carried out to optimize QT-PLGA nanobubbles.
View Article and Find Full Text PDFRev Sci Instrum
December 2024
Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Aoba-ku, Sendai, Miyagi 980-8577, Japan.
An objective soft x-ray flat-field spectrograph employing a laminar-type bilayer coated, varied-line-spacing, spherical grating was designed to improve the detection limit and sensitivity of soft x-ray flat-field spectrographs in a region of 250-550 eV. As a design criterion, spectral flux, SF, [Hatano et al., Appl.
View Article and Find Full Text PDFTalanta
December 2024
Thin Films and Materials Science Research Laboratory, Department of Physics, Dayanand Science College, Latur, Maharashtra, 413512, India. Electronic address:
In this study, we report the synthesis, optical characterization and ultra-sensitive ammonia gas sensing properties of Mg-doped ZnO cauliflower like nanostructures obtained via chemical spray pyrolysis technique. The morphological and structural properties of the prepared films were investigated by Field Emission Scanning electron microscope (FESEM) and X-ray diffraction (XRD). Gas sensing and optical characterizations were carried out using Keithley electrometer and Uv-Vis.
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