Sol-Gel Process for Preparing Spheroidal Particles of Dicarbides of Thorium and Thorium-Uranium Mixtures

Kelly, J.L.; Kleinsteuber, A. T.; Clinton, S.D.; Dean, O.C.

doi:10.1021/i260014a016

Cited by 12 publications

(3 citation statements)

References 2 publications

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“…This phenomenon was reported in the 1960's by researchers at Oak Ridge National Laboratory and has been extensively employed to prepare solid microspheres of thoria, urania, and plutonia for ceramic nuclear fuel applications. 23 " 25 The reason solid microspheres were formed in the aforementioned literature is probably attributed to the use of 2-EH which has very little dehydration capability (2.5% water solubility), leading to a very low water extraction rate. As noted previously, the importance of water extraction rate lies in the critical time (t c ) to form the initial membrane.…”

Section: Influence Of Process Variables On Microsphere Size and Asmentioning

confidence: 99%

Factors influencing the formation of hollow ceramic microspheres by water extraction of colloidal droplets

Liu¹,

Wilcox²

1995

J. Mater. Res.

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Hollow ceramic microspheres of A1 2 O 3 , SiO 2 , and mullite have been prepared by the combination of an emulsion technique with a water extraction sol-gel method. Concentration of sol, initial droplet size, and water extraction rate of the system are found to be the important process parameters controlling the size and wall thickness of the hollow microspheres, and their influences are shown. A model that correlates the morphology of microspheres to concentration and water extraction rate is proposed and is in good agreement with the experimental observations. The capability and limitation of this process for forming hollow microspheres are demonstrated. It was shown that hollow microspheres with sizes greater than 5 fim could be readily prepared, while a limitation was met for sizes less than 1 /xm, in which case solid microspheres were normally formed.

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Section: Influence Of Process Variables On Microsphere Size and Asmentioning

confidence: 99%

Factors influencing the formation of hollow ceramic microspheres by water extraction of colloidal droplets

Liu¹,

Wilcox²

1995

J. Mater. Res.

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“…Another approach is to dissolve the solid powder in sufficient solvent to render it fluid, disperse by agitation or spray into water and steam-distill the solvent to give solid particles [17]. In the sol-gel process [19,20], small crys tallites of various materials are dispersed as an aqueous sol which is then formed into droplets in an organic phase. Gelation into a more solid form occurs in the organic phase, for example by dehydration of the aqueous droplets through the action of higher alcohols in the organic phase.…”

Section: Dispersion In Liquid Phasementioning

confidence: 99%

Agglomeration in Liquid Media

1980

Handbook of Powder Technology

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“…By use of two nozzles simultaneously, a 3.1 M thoria sol was fed through each two-fluid nozzle at a rate of 2.5 cc. per minute for 4 hours. With a value of 2.4 for constant k in Equation 1, the drive-fluid flow rate was set to produce spheres with a calcined diameter of 230 microns.…”

Section: Dispersion Of Solsmentioning

confidence: 99%