Sintering of pseudo-boehmite and γ-Al2O3

Tijburg, I. I. M.; Bruin, Hubert de; Elberse, P. A.; Geus, J.W.

doi:10.1007/bf01130139

Cited by 52 publications

(28 citation statements)

References 12 publications

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“…2) Alternatively, if the particle sizes are too small, then nucleation of the more stable phase may be strongly hindered and the existence of γ‐alumina in the carbon matrix at 1300 °C would be due to a kinetic barrier. Also this effect has been discussed extensively for zirconia,124 and related arguments have been put forward for alumina as well 125…”

Section: Exotemplating: Creating High‐surface‐area Materials By Symentioning

confidence: 99%

Endo‐ and Exotemplating to Create High‐Surface‐Area Inorganic Materials

2003

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Porous and high-surface-area materials are of interest to many scientific communities. Templating pathways can be used to synthesize such materials with a high degree of control over their structural and textural properties. As templates molecular or supramolecular units are added to the synthesis mixture. They are occluded in the growing solid and leave a pore system after their removal. For such templates the term "endotemplate" is introduced. Alternatively, the templates can be materials with structural pores in which another solid is created, thus providing a scaffold for the synthesis. After removal of the scaffold, a porous or finely divided solid remains, depending on the connectivity of the template. Such a template is termed an "exotemplate". By judicious choice of the templating procedure, unprecedented control of the structure and texture on length scales between nanometers and micrometers has been achieved over the last few years.

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Section: Exotemplating: Creating High‐surface‐area Materials By Symentioning

confidence: 99%

Endo‐ and Exotemplating to Create High‐Surface‐Area Inorganic Materials

2003

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“…These rods are approximately 260 nm in length, 95 nm in width and 8-14 nm in thickness. Synthetic well-crystallised boehmite microcrystals from some commercial boehmite samples have been described variously: as thin plates 21 ; as fibrous platelets 13 ; as needle-like 24 ; as platelets 25 ; as thin and acicular 26 ; as tiny needles 27 ; and as rods 28 . The variety of descriptions indicates that synthetic wellcrystallised boehmite microcrystals have different plate-like shapes.…”

Section: Ervin and Osbornmentioning

confidence: 99%

Hydrothermal synthesis of well-crystallised boehmite crystals of various shapes

et al. 2009

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Aluminium monohydroxide, also known as aluminium oxyhydroxide (boehmite -AlO[OH]), is water insoluble but crystallises into microcrystals of various shapes. When, by X-ray diffraction, the microcrystals present a basal reflexion (d [020] ) of 0.611 nm, the crystalline structure is referred to as "well-crystallised" boehmite. Natural and synthetic crystals of well-crystallised boehmite can have a plate-like shape with either a rhombic or hexagonal profile. Synthetic crystals can also be lath-like or ellipsoid in shape. The purpose of this paper is to present a method of hydrothermal synthesis using a single temperature (200 °C) for preparing plate-like crystals of wellcrystallised boehmite with ellipsoid, rhombic, hexagonal, and lath-like profiles by using different precursors. Our observations suggest that all of these shapes are stages of growth of the microcrystals of well-crystallised boehmite along the c-axis direction of the rhombic crystals.

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“…During thermal treatments, it undergoes a series of polymorphs of g-, d-, y-, then to the thermodynamically stable phase, a-Al 2 O 3 [10]. The y-to a-Al 2 O 3 phase transformation can be achieved by a nucleation and growth process [11][12][13].…”

Section: Introductionmentioning

confidence: 99%