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K.H. Tonge

Bio: K.H. Tonge is an academic researcher from Royal College of Physicians and Surgeons of Canada. The author has contributed to research in topics: Decomposition & Thermal decomposition. The author has an hindex of 1, co-authored 1 publications receiving 26 citations.

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Journal ArticleDOI
TL;DR: The thermal decomposition of the anhydrous formates of manganese and zinc has been studied by means of thermogravimetry, differential thermal analysis and gas evolution analysis as discussed by the authors.

26 citations


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Journal ArticleDOI
TL;DR: The theoretical work showed that the "heating-up" and "hot injection" processes could be understood within the same theoretical framework in which they share the characteristics of nucleation and growth stages.
Abstract: We studied the kinetics of the formation of iron oxide nanocrystals obtained from the solution-phase thermal decomposition of iron−oleate complex via the “heating-up” process. To obtain detailed information on the thermal decomposition process and the formation of iron oxide nanocrystals in the solution, we performed a thermogravimetric-mass spectrometric analysis (TG-MS) and in-situ magnetic measurements using SQUID. The TG-MS results showed that iron−oleate complex was decomposed at around 320 °C. The in-situ SQUID data revealed that the thermal decomposition of iron−oleate complex generates intermediate species, which seem to act as monomers for the iron oxide nanocrystals. Extensive studies on the nucleation and growth process using size exclusion chromatography, the crystallization yield data, and TEM showed that the sudden increase in the number concentration of the nanocrystals (burst of nucleation) is followed by the rapid narrowing of the size distribution (size focusing). We constructed a theore...

415 citations

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TL;DR: The thermal behavior of di-, tri-and tetravalent metal soaps (carboxylates) is reviewed in this paper, with reference to both the phase behaviour and thermal decomposition.

100 citations

Journal ArticleDOI
TL;DR: It is reported that gas bubbles can be used to tailor the kinetics of the nucleation and growth of inorganic-nanocrystals in a colloidal synthesis, and it is suggested that a prerequisite for effectively suppressing secondary nucleation in aColloidal synthesis is that the primary nucleation must produce a critical amount of nuclei.
Abstract: This paper reports that gas bubbles can be used to tailor the kinetics of the nucleation and growth of inorganic-nanocrystals in a colloidal synthesis. We conducted a mechanistic study of the synthesis of colloidal iron oxide nanocrystals using gas bubbles generated by boiling solvents or artificial Ar bubbling. We identified that bubbling effects take place through absorbing local latent heat released from the exothermic reactions involved in the nucleation and growth of iron oxide nanocrystals. Our results show that gas bubbles display a stronger effect on the nucleation of iron oxide nanocrystals than on their growth. These results indicate that the nucleation and growth of iron oxide nanocrystals may rely on different types of chemical reactions between the iron–oleate decomposition products: the nucleation relies on the strongly exothermic, multiple-bond formation reactions, whereas the growth of iron oxide nanocrystals may primarily depend upon single-bond formation reactions. The identification of ...

83 citations

Journal ArticleDOI
TL;DR: In this paper, a general synthesis for a family of n-type transparent conducting oxide nanocrystals through doping with aliovalent cations is presented, which exhibit localized surface plasmon resonances tunable in the mid and near-infrared with increasing dopant concentration.
Abstract: We present a general synthesis for a family of n-type transparent conducting oxide nanocrystals through doping with aliovalent cations. These monodisperse nanocrystals exhibit localized surface plasmon resonances tunable in the mid- and near-infrared with increasing dopant concentration. We employ a battery of electrical measurements to demonstrate that the plasmonic resonance in isolated particles is consistent with the electronic properties of oxide nanocrystal thin films. Hall and Seebeck measurements show that the particles form degenerately doped n-type solids with free electron concentrations in the range of 1019 to 1021 cm–3. These heavily doped oxide nanocrystals are used as the building blocks of conductive, n-type thin films with high visible light transparency.

51 citations

Journal ArticleDOI
TL;DR: In this paper, metal acetate hydrazinates, M(CH3COO)2(N2H4)2 (M = Mn, Co, Ni, Zn, Cd) have been characterized by chemical analysis and infrared absorption spectra.

47 citations