A5025193101- Clay minerals and soil interactions
- Concrete and Cement Materials Research
- Advanced ceramic materials synthesis
- Glass properties and applications
- Nuclear materials and radiation effects
- Zeolite Catalysis and Synthesis
- Chemical Synthesis and Characterization
- Mesoporous Materials and Catalysis
- Magnesium Oxide Properties and Applications
- Recycling and utilization of industrial and municipal waste in materials production
- Advanced NMR Techniques and Applications
- Iron oxide chemistry and applications
- Thermal and Kinetic Analysis
- Fluorine in Organic Chemistry
- Layered Double Hydroxides Synthesis and Applications
- X-ray Diffraction in Crystallography
- Organic Chemistry Cycloaddition Reactions
- Asymmetric Synthesis and Catalysis
- Innovative concrete reinforcement materials
- Microwave Dielectric Ceramics Synthesis
- Solid-state spectroscopy and crystallography
- Chemical Reactions and Mechanisms
- Luminescence Properties of Advanced Materials
- Building materials and conservation
- Ferroelectric and Piezoelectric Materials
Victoria University of Wellington
2016-2025
MacDiarmid Institute for Advanced Materials and Nanotechnology
2016-2025
Keio University
2024
Arizona State University
2024
University of Calgary
2023
American University of the Middle East
2019
Plasma Processes (United States)
2017
Marymount University
2000-2015
University of Aberdeen
1999-2014
Mrag Americas (United States)
2014
The effect of SiO 2 addition on the anatase‐to‐rutile phase transition was investigated by DTA, XRD, FTIR, and XPS. TiO xerogels containing up to 20 mol% were prepared mixing hydrolyzing titanium tetraisopropoxide (TTIP) tetraethylorthosilicate (TEOS) with HNO 3 as a catalyst. With increased amounts in xerogels, following results obtained: (1) crystallization temperature anatase from 415°C pure 609°C 20‐mol%‐SiO ‐containing xerogel DTA curves; (2) formation rutile, according quantitative XRD...
Structural models previously proposed for metakaolinite are examined in light of the most recent published experimental data and new information obtained by solid‐state high resolution 29 Si 27 AI NMR. A model is proposed, consisting anhydrous regions distorted AI‐0 tetrahedra containing randomly distributed isolated residual hydroxyls associated with A1‐0 configurations regular octahedral tetrahedpal symmetry. Such a structure, which can readily be formed from kaolinite removal certain...
Solid‐state 29 Si and 27 Al NMR spectra of kaolinite fired at 800° to 1450°C, interpreted in light a newly proposed metakaolinite structure complementary X‐ray diffraction results, lead the following conclusions about hightemperature reactions: (1) Removal final residual hydroxyl radicals ∼9707deg;C triggers separation considerable amount amorphous free silica formation poorly crystalline mullite spinel phase. (2) Mullite form tandem, former originating vicinity AI‐0 units regular octahedral...
Solid-state 27Al and 25Mg MAS NMR X-ray powder diffraction in combination with thermal analysis indicates that synthetic hydrotalcite decomposes thermally at least three weight-loss steps. The first step, 250–280 °C, principally involves the loss of interlayer water, but appearance some tetrahedral Al spectra suggests this is accompanied by onset dehydroxylation. second 300–400 a rapid increase proportion to maximum 400 indicating full dehydroxylation regions. third above represents...
A simple ion-exchange method is reported for replacing the charge-balancing cations in aluminosilicate inorganic polymers with a range of other cations. Complete exchange Na+ conventional Na-inorganic polymer by K+, Ag+, NH4+ and Pb2+ was achieved this method, lower degree Li+ (82%), Cd2+ (78%) Mg2+ (57%). The NH4+-compound can be completely exchanged but less efficient compound than when using Na-compound as starting material. X-ray-amorphous nature Al Si environment original Na are...
N. H. Brett, K. J. D. MacKenzie and Sharp, Q. Rev. Chem. Soc., 1970, 24, 185 DOI: 10.1039/QR9702400185