Relationship between the microstructure of boehmite gels and their transformation to alpha-alumina

Radonjić, L.; Srdić, Vladimir V.; Nikolić, Ljubiša

doi:10.1016/0254-0584(93)90078-z

Cited by 13 publications

(10 citation statements)

References 16 publications

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“…Boehmite and γ-Alumina exist together at 400 1C however, at 600 1C only γ-Alumina peaks were seen. Park et al [22] and Radonjic et al [23] have reached the same conclusion.…”

Section: The Crystal Structure Of the Alumina Layersupporting

confidence: 50%

RETRACTED: Preparation and characterization of multilayer mesoporous alumina nano membrane via sol–gel method using new precursors

Kheirollahi

Abdellahi

Emamalizadeh

et al. 2015

Ceramics International

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“…Boehmite and γ-Alumina exist together at 400 1C however, at 600 1C only γ-Alumina peaks were seen. Park et al [22] and Radonjic et al [23] have reached the same conclusion.…”

Section: The Crystal Structure Of the Alumina Layersupporting

confidence: 50%

RETRACTED: Preparation and characterization of multilayer mesoporous alumina nano membrane via sol–gel method using new precursors

Kheirollahi

Abdellahi

Emamalizadeh

et al. 2015

Ceramics International

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“…However, at 600°C only γ-alumina peaks were observed. Park et al [22] and Radonjic et al [23] came to the same conclusion.…”

Section: The Crystal Structure Of the Alumina Layersupporting

confidence: 71%

Preparation and characterization of multilayer mesoporous γ-alumina membrane obtained via sol-gel using new precursors

Tafrishi

Taheri-Nassaj

Sadighzadeh

et al. 2015

Materials Science-Poland

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In this paper, a mesoporous γ-alumina membrane coated on a macroporous α-alumina support via sol-gel method has been reported. A crack-free γ-alumina membrane was obtained by adding PVA to the alumina solution and optimum parameters of roughness, temperature and porosity were achieved. The support was dip-coated in different solutions using two new different solvents with different particle size distributions. Using these two solvents led to the uniform distribution of pore size in the final membrane. The alumina sols showed particle size distributions in the range of 20 to 55 nm which was measured by a DLS Zeta Sizer. X-ray diffraction technique, atomic force microscopy and scanning electron microscopy were used to characterize the membrane layer. XRD and DTA data for the γ-alumina membrane showed its thermal stability up to around 600°C. The thickness of the mesoporous γ-alumina membrane was about 4 µm with 16 nm of surface roughness and 5 nm pore size. The resultant crack-free mesoporous membrane shows that the membrane preparation procedure was optimum. In this work, it has been investigated the performance of γ-alumina membranes for single gas permeation and separation of binary gas mixtures.

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“…Homogeneous precipitation using urea decomposition of aluminium nitrate in various media was reported to yield alumina powders of varying properties. 3 Usually, the steps involved in the precipitation reaction are hydrolysis of aluminium salts, peptisation of the precipitate to stable sols, gelation, drying and calcination. 4 Finally, the calcined portion is got converted to the high temperature phase form of a-alumina.…”

Section: Introductionmentioning

confidence: 99%

Sol-Gel Concepts as Applied to Alumina Ceramics

Warrier

1995

Transactions of the Indian Ceramic Society

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Alumina has been recognised as one of the most important high temperature ceramic materials; as its application has expanded the scope, a variety of preparative processes have also emerged. For example, sol-gel based synthesis techniques have been applied with a variety of modifications. The monohydroxy aluminium oxide (boehmite) is the precursor in most of the synthesis techniques. Keeping boehmite sol as the starting material, ceramic materials such as alumina, aluminium titanate and alumina-titania high surface area particulates have been prepared at low processing temperatures, and are reported here.Details regarding the in-depth problems with respect to the understanding of structure-property relations in boehmite are presented. Further, the details of synthesis of some high temperature alumina ceramics are discussed. The importance of hydrolysis procedure and calcination conditions in the control of the end properties is highlighted.

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Relationship between the microstructure of boehmite gels and their transformation to alpha-alumina

Cited by 13 publications

References 16 publications

RETRACTED: Preparation and characterization of multilayer mesoporous alumina nano membrane via sol–gel method using new precursors

RETRACTED: Preparation and characterization of multilayer mesoporous alumina nano membrane via sol–gel method using new precursors

Preparation and characterization of multilayer mesoporous γ-alumina membrane obtained via sol-gel using new precursors

Sol-Gel Concepts as Applied to Alumina Ceramics

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