Study of non-isothermal crystallization of Eu3+ doped Zn2SiO4 powders through the application of various macrokinetic models

Janković, Bojan; Marinović‐Cincović, Milena; Dramićanin, Miroslav D.

doi:10.1016/j.jallcom.2013.10.240

Cited by 4 publications

(1 citation statement)

References 70 publications

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“…Statistical analysis suggested that Avrami exponent values of oleogels differ from each other significantly ( P < 0.05). This indicated that the growth of the crystals may be both 1‐dimensional and 2‐dimensional (Francis ; Janković and others ). The fitting correlation coefficient for S1 was different from the fitting correlation coefficient values of S2, S3, and S4.…”

Section: Resultsmentioning

confidence: 98%

Effect of Span 60 on the Microstructure, Crystallization Kinetics, and Mechanical Properties of Stearic Acid Oleogels: An In‐Depth Analysis

Uvanesh

Sagiri

Senthilguru

et al. 2015

Journal of Food Science

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Modulation of crystallization of stearic acid and its derivatives is important for tuning the properties of stearate oleogels. The present study delineates the crystallization of stearic acid in stearate oleogels in the presence of Span 60. Microarchitecture analysis revealed that stearic acid crystals in the oleogels changed its shape from plate-like structure to a branched architecture in the presence of Span 60. Consequently, a significant variation in the mobility of the solute molecules inside the oleogel (Fluorescence recovery after photobleaching studies, FRAP analysis) was observed. Thermal analysis (gelation kinetics and DSC) revealed shortening of nucleation induction time and secondary crystallization with an increase in the Span 60 concentration. Furthermore, isosolid diagram suggested better physical stability of the formulations at higher proportions of Span 60. XRD analysis indicated that there was a decrease in the crystal size and the crystallinity of the stearic acid crystals with an increase in Span 60 concentration in the Span 60 containing oleogels. However, crystal growth orientation was unidirectional and found unaltered with Span 60 concentration (Avarmi analysis using DSC data). The mechanical study indicated a composition-dependent variation in the viscoelastic properties (instantaneous [τ 1 ], intermediate [τ 2 ], and delayed [τ 3 ] relaxation times) of the formulations. In conclusion, Span 60 can be used to alter the kinetics of the crystallization, crystal habit and crystal structure of stearic acid. This study provides a number of clues that could be used further for developing oleogel based formulation.Practical Application: Stearic acid can be used for the solidification of vegetable oils. This will allow easy handling, storage and transportation of the oils. The physical and the thermal properties of the oleogels can be altered by tailoring the microstructure of the oleogels using Span 60 (nonionic surfactant). The oleogels can be used for the controlled delivery of nutraceuticals and drugs.

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Section: Resultsmentioning

confidence: 98%

Effect of Span 60 on the Microstructure, Crystallization Kinetics, and Mechanical Properties of Stearic Acid Oleogels: An In‐Depth Analysis

Uvanesh

Sagiri

Senthilguru

et al. 2015

Journal of Food Science

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Optical band gap and photoluminescence studies of Eu3+-doped zinc silicate derived from waste rice husks

Khaidir

Fen

Zaid

et al. 2019

Optik

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In this study, investigation on photoluminescence and optical properties of europium doped zinc silicate (Zn2SiO4:Eu3+) glass ceramics derived from white rice husk ash as potential silica source have been done. Undoped and 3 wt. % of europium doped zinc silicate were prepared by solid state method and sintered at 600-1000 °C for 2 h. XRD analysis revealed the phase formation of amorphous, α or β-Zn2SiO4:Eu3+ phases of the glass and glass ceramic samples. FESEM results show the samples were irregular in shapes but well connected and formed large grain crystallites as sintering temperatures increases. The optical band gap values for undoped samples are increasing from 2.97 eV to 3.39 eV respectively. Meanwhile, the optical band gap values for 3 wt. % Eu3+ doped samples decrease from 4.14 eV to 2.62 eV and increase again to 3.71 eV as sintering temperature increases. PL analysis concludes that the red emission exhibited corresponding to 5D0 → 7F2 electron configuration at 612 nm while excitation spectra was found at 400 nm attributed to 7F0 → 5L6 transition. As conclusion, Eu3+ doped Zn2SiO4 glasses has potential as glass host phosphor which can be used for optical devices such as plasma display panels (PDPs) and cathode ray tubes.

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Addition of ZnO nanoparticles on waste rice husk as potential host material for red-emitting phosphor

Khaidir

Fen

Zaid

et al. 2020

Materials Science in Semiconductor Processing

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Study of non-isothermal crystallization of Eu3+ doped Zn2SiO4 powders through the application of various macrokinetic models

Cited by 4 publications

References 70 publications

Effect of Span 60 on the Microstructure, Crystallization Kinetics, and Mechanical Properties of Stearic Acid Oleogels: An In‐Depth Analysis

Effect of Span 60 on the Microstructure, Crystallization Kinetics, and Mechanical Properties of Stearic Acid Oleogels: An In‐Depth Analysis

Optical band gap and photoluminescence studies of Eu3+-doped zinc silicate derived from waste rice husks

Addition of ZnO nanoparticles on waste rice husk as potential host material for red-emitting phosphor

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