Synthesis, characterization and nonisothermal decomposition kinetics of La2(CO3)3·3.4H2O

Zhang, Xianghui; He, Chao; Wang, Ling; Li, Zhongquan; Feng, Qian

doi:10.1007/s10973-015-4389-3

Cited by 26 publications

(9 citation statements)

References 22 publications

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“…To further substantiate this by Fouriertransform infrared spectroscopy (FTIR), the spectrum of SFGO-La 3+ showed additional absorption bands between 668 and 818 cm −1 , which correspond to the characteristic bands of hydrated lanthanum carbonate (Fig. 4D) (50,51). In particular, the band at 668 cm −1 is likely due to lattice vibrations of La─O (51).…”

Section: Membrane Characterizationmentioning

confidence: 87%

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Realizing small-flake graphene oxide membranes for ultrafast size-dependent organic solvent nanofiltration

et al. 2020

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Membranes for organic solvent nanofiltration (OSN) or solvent-resistant nanofiltration (SRNF) offer unprecedented opportunities for highly efficient and cost-competitive solvent recovery in the pharmaceutical industry. Here, we describe small-flake graphene oxide (SFGO) membranes for high-performance OSN applications. Our strategy exploits lateral dimension control to engineer shorter and less tortuous transport pathways for solvent molecules. By using La3+ as a cross-linker and spacer for intercalation, the SFGO membrane selective layer was stabilized, and size-dependent ultrafast selective molecular transport was achieved. The methanol permeance was up to 2.9-fold higher than its large-flake GO (LFGO) counterpart, with high selectivity toward three organic dyes. More importantly, the SFGO-La3+ membrane demonstrated robust stability for at least 24 hours under hydrodynamic stresses that are representative of realistic OSN operating conditions. These desirable attributes stem from the La3+ cross-linking, which forms uniquely strong coordination bonds with oxygen-containing functional groups of SFGO. Other cations were found to be ineffective.

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Section: Membrane Characterizationmentioning

confidence: 87%

“…4D) (50,51). In particular, the band at 668 cm −1 is likely due to lattice vibrations of La─O (51). In addition, band shifts and changes were observed after cross-linking with La 3+ .…”

Section: Membrane Characterizationmentioning

confidence: 90%

Realizing small-flake graphene oxide membranes for ultrafast size-dependent organic solvent nanofiltration

et al. 2020

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“…The geometric models, widely used in the kinetic analysis of thermal decomposition reactions [20][21][22][23][24][25], are based upon the processes of nucleation and growth of product nuclei by interface advance. It was suggested that more reliable data can be obtained from the kinetic study of single crystals compared to powdery samples [1].…”

Section: Introductionmentioning

confidence: 99%

An experimentally validated numerical model of interface advance of the lithium sulfate monohydrate dehydration reaction

Lan

Steenhoven

Rindt

2016

J Therm Anal Calorim

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Interface advance plays an essential role in understanding the kinetics and mechanisms of thermal decomposition reactions such as the dehydration reaction of lithium sulfate monocrystals. However, many fundamental processes including mass transfer during interface advance are still not clear. In this work, the dynamics of interface advance, involving interaction between interfacial reaction and mass diffusion, is investigated numerically together with microscopy observations. A mathematical model is developed for interface advance with a moving boundary and then solved by using a conservative scheme. To examine the significance between the intrinsic chemical reaction and mass diffusion, a Damköhler number is defined as Da ¼ k r L=ðD e c 0 Þ. Numerical results at various Da values are discussed to distinguish the limiting step of the dehydration reaction of lithium sulfate monocrystals. Moreover, experiments are carried out with a hot-stage microscopy system where the propagation of the reaction interface into the crystal bulk is followed in situ. By fitting the experimental results with the numerical results, the effective diffusivity of water through the dehydrated crystal is estimated to be in the order of 10 À8 m 2 s À1 . According to the corresponding Da values, it is found that, within the reaction temperature ranging from 110 to 130°C and a partial water vapor pressure of 13 mbar, the rate of dehydration interface advance in the bulk of large crystals (typically in the order of millimeters) is not constant, but shows a small decrease over time due to the influence of mass diffusion.

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“…Another feature is when T is close to T 0 , E value should be infinity. [27][28][29][30][31] is: Figure 4b shows the Friedman plots for the pure VO 2 at a = 0.5 around the T p . Two plots demonstrate nonlinear plots of similar shape.…”

Section: Resultsmentioning

confidence: 99%

Thermal kinetic analysis of metal–insulator transition mechanism in W-doped VO2

Zhang

Chen

et al. 2016

J Therm Anal Calorim

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Tungsten (W) doping can decrease the phase transition temperature of VO 2 , but underlining reasons are not clear. In this study, differential scanning calorimetry was employed to investigate the kinetics of the solid-solid transition in hydrothermal-synthesized W (X = 0.50, 1.09, 2.58 and 3.81 %)-doped VO 2 nanoparticles. We firstly revealed the W-doping mechanism by combining the classical nucleation kinetics model with isoconversional kinetic analysis and applied them on the solid-solid transition taking place in doping. The experimentally observed large lag in the cooling stage and asymmetry effects of the decreasing temperature on insulator-metal transition and metal-insulator transition can be rationally explained. In the heating stage, W doping decreases free energy barrier (DG*) for homogenous nucleation and reduces geometrical factor (f(H)) and both factors promote the transition and thus lower the phase transition temperature quickly. However, in cooling stage, the free energy barrier (DG het * ) for heterogeneous nucleation was much larger than that of heating stage due to lacking of proper nucleation sites. The effect of decreasing geometrical factor was accompanied with the effect of increasing free energy barrier for homogenous nucleation by doping W. Such a competition mechanism slows down the trend of reducing temperature. It is important to unravel interaction mechanisms of doped W on different VO 2 phases, which is helpful to further tailor kinetic properties of VO 2 phase transition.

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Synthesis, characterization and nonisothermal decomposition kinetics of La2(CO3)3·3.4H2O

Cited by 26 publications

References 22 publications

Realizing small-flake graphene oxide membranes for ultrafast size-dependent organic solvent nanofiltration

Realizing small-flake graphene oxide membranes for ultrafast size-dependent organic solvent nanofiltration

An experimentally validated numerical model of interface advance of the lithium sulfate monohydrate dehydration reaction

Thermal kinetic analysis of metal–insulator transition mechanism in W-doped VO2

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