Synthesis of AlPO4 and kinetics of thermal decomposition of AlPO4·H2O-H4 precursor

Boonchom, Banjong; Youngme, Sujittra; Srithanratana, Tipaporn; Danvirutai, Chanaiporn

doi:10.1007/s10973-007-8420-1

Cited by 27 publications

(13 citation statements)

References 24 publications

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“…This absorbance was ascribed to phosphate ions. 21) When the alumina films were treated at 160°C for 6 h, the spectrum of the films showed an absorbance at 1136 cm ¹1 , whereas the films treated at the same temperature for 4 h or less did not show the absorbance (not shown). These results indicate that phosphate ions were present at the film surfaces after the treatment at 160 and 180°C for 6 h.…”

Section: Resultsmentioning

confidence: 95%

Preparation of superhydrophilic alumina films by hydrothermal processes using an organophosphorous compound

Kato

Nishide

Nara

et al. 2015

J. Ceram. Soc. Japan

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Superhydrophilic alumina films were successfully fabricated by a hydrothermal reaction of nanofibrous alumina films in a nitrilotris(methylenephosphonic acid) (NMP) aqueous solution at 180°C for 6 h. The films showed superhydrophilicity not only as prepared but also after a boiling water resistance test, indicating that they had good durability. The alumina films were phosphorylated wholly in a hydrothermal condition only at 180°C for 6 h. Phosphate moieties were present both at the surface and inside the films and a micro-structure with a serrated morphology was observed over the entire film surface. Whole phosphorylation of the alumina films resulted in good durability in the boiling water resistance test. Other films were phosphorylated partially at 160°C for 6 h and at 180°C for 4 h. The micro-structure with a serrated morphology was observed partially at the film surface. This morphology corresponded to the degree of phosphorylation. These results indicate that the phosphate moieties present on and in the films and the micro-structure of the films produced superhydrophilicity.

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Section: Resultsmentioning

confidence: 95%

Preparation of superhydrophilic alumina films by hydrothermal processes using an organophosphorous compound

Kato

Nishide

Nara

et al. 2015

J. Ceram. Soc. Japan

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“…The activation energy and pre-exponential factor were calculated from the slopes and y-intercepts of the straight lines [42]. The model with the highest correlation coefficient is the best-fit kinetic model; meanwhile, the calculated activation energy values from four heating rates must close to the values calculated from the iterative methods [28,42,45].…”

Section: Determination Of Activation Energymentioning

confidence: 99%

“…According to the FTIR spectra, six vibrational band positions of water of crystallization (3440. 45 (20)] [53].…”

Section: Determination Of Iso-kinetic Temperaturementioning

confidence: 99%

Studies of thermal decomposition kinetics and temperature dependence of thermodynamic functions of the new precursor LiNiPO4·3H2O for the synthesis of olivine LiNiPO4

Kullyakool

Siriwong

Noisong

et al. 2015

J Therm Anal Calorim

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The olivine LiNiPO 4 was synthesized via the calcination of the new precursor LiNiPO 4 Á3H 2 O at 600°C. The precursor was obtained from low-temperature (50°C) wet chemical reaction. The results from XRD, FTIR, AAS/ AES and TG/DTG/DTA techniques confirmed the formula of the title compounds. The SEM results indicated the morphologies of the hydrate precursor as thin plate particles and the calcined product as small bead particles. The BET surface area of the final calcined product at 600°C is much higher (5.807 m 2 g -1 ) than that reported in the literature (0.25 m 2 g -1 ). The kinetic triplet [activation energy, E, pre-exponential factor, A, and the most probable mechanism function, g(a)] and the thermodynamic functions of activated complexes (DS = , DH = and DG = ) for the dehydration step of LiNiPO 4 Á3H 2 O were determined and discussed. The mechanism of the dehydration process is the single-step A 3/2 (assumed random nucleation and its subsequent growth). New information, namely the isobaric molar heat capacity, experimental entropy, enthalpy and Gibbs energy changes as function of temperature (K) of LiNiPO 4 Á3H 2 O and LiNiPO 4 , was evaluated from the DSC data by third-order polynomial fitting and reported for the first time. The calculated corresponding thermodynamic functions from kinetic parameters are compared and discussed.

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“…However, if the E a values are dependent on , the decomposition should be interpreted in terms of multi-step reaction mechanisms [17,[22][23][24][25][26][27][28][29]. The shapes of the dependence of E a on ˛ have been identified from model data for competing [30], independent [31], consecutive [32], and reversible [33] reactions, as well as reactions complicated by diffusion [34].…”

Section: Thermogravimetric Analysis (Tga)mentioning

confidence: 99%

Synthesis and degradation kinetics of a novel polyester containing bithiazole rings

Luyt

et al. 2011

Thermochimica Acta

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Synthesis of AlPO4 and kinetics of thermal decomposition of AlPO4·H2O-H4 precursor

Cited by 27 publications

References 24 publications

Preparation of superhydrophilic alumina films by hydrothermal processes using an organophosphorous compound

Preparation of superhydrophilic alumina films by hydrothermal processes using an organophosphorous compound

Studies of thermal decomposition kinetics and temperature dependence of thermodynamic functions of the new precursor LiNiPO4·3H2O for the synthesis of olivine LiNiPO4

Synthesis and degradation kinetics of a novel polyester containing bithiazole rings

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