Ceramic hollow spheres and their applications

Cochran, Jack

doi:10.1016/s1359-0286(98)80010-7

Cited by 181 publications

(89 citation statements)

References 6 publications

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“…They are also used in syntactic foams, associated with a polymeric, metallic or ceramic matrix, for applications such as stress absorption, acoustic insulation, lightweight parts, buoyancy modules, radar-transparent components, blast mitigation or thermal management (Shutov 1986;Cochran 1998). S468 Ceramic microparticles and capsules C. Ye et al…”

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confidence: 99%

Ceramic microparticles and capsules via microfluidic processing of a preceramic polymer

Chen

Colombo

et al. 2010

J. R. Soc. Interface.

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We have developed a robust technique to fabricate monodispersed solid and porous ceramic particles and capsules from single and double emulsion drops composed of silsesquioxane preceramic polymer. A microcapillary microfluidic device was used to generate the monodispersed drops. In this device, two round capillaries are aligned facing each other inside a square capillary. Three fluids are needed to generate the double emulsions. The inner fluid, which flows through the input capillary, and the middle fluid, which flows through the void space between the square and inner fluid capillaries, form a coaxial co-flow in a direction that is opposite to the flow of the outer fluid. As the three fluids are forced through the exit capillary, the inner and middle fluids break into monodispersed double emulsion drops in a single-step process, at rates of up to 2000 drops s 21. Once the drops are generated, the silsesquioxane is cross-linked in solution and the cross-linked particles are dried and pyrolysed in an inert atmosphere to form oxycarbide glass particles. Particles with diameters ranging from 30 to 180 mm, shell thicknesses ranging from 10 to 50 mm and shell pore diameters ranging from 1 to 10 mm were easily prepared by changing fluid flow rates, device dimensions and fluid composition. The produced particles and capsules can be used in their polymeric state or pyrolysed to ceramic. This technique can be extended to other preceramic polymers and can be used to generate unique core -shell multimaterial particles.

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confidence: 99%

Ceramic microparticles and capsules via microfluidic processing of a preceramic polymer

Chen

Colombo

et al. 2010

J. R. Soc. Interface.

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“…Previous methods of preparation have involved some liquid phase syntheses such as layer-by-layer LBL deposition, 9 sol-gel process, 10 and inorganic precipitation using templates, 11 and gas phase synthesis such as spray-drying.…”

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confidence: 99%

Formation of TiO<sub>2</sub> Hollow Nanoparticles via Gas Phase Synthesis using Titanium Oxide Acetylacetonate as a Precursor

Lee

2006

J. Ceram. Soc. Japan

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TiO 2 nanoparticles were synthesized by chemical vapor condensation CVC using titanium oxide acetylacetonate as a precursor in the temperature range of 800-1000? C. TEM observation revealed that TiO 2 nanoparticles 10-40 nm in diameter consisted of a hollow structure with shells 4-5 nm in thickness. From XRD results, it was found that TiO 2 nanopowders obtained at all temperatures consisted of a two-phase rutile and anatase mixture. The sequential decomposition of the metal acetylacetonate precursor observed in thermogravimetry TG analysis showed that formation of the hollow structure depends on the characteristics of the metalorganic precursor. In addition, it was found that the transmittance of TiO 2 hollow nanoparticles is lower than that of commercial nanopowders in the wavelength range of 400-800 nm by UV-visible spectrophotometry. However, the band gap energy of the TiO 2 hollow nanoparticles at about 3.0 eV is unchanged from other forms of TiO 2 .

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“…Hollow particle (HP) which is defined as a particle with an internal void has received much attention because it is useful in various fields such as lithium battery [1], piezoelectric transducer [2], drug delivery [3][4][5], catalyst [6,7], and light diffuser [8]. A variety of inorganic materials such as silica [9,10], calcium carbonate [11], copper oxide [12], tin oxide [13], and titanium oxide [14] have been used for building blocks for HP.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Hollow Silica Particles Using a Self-Assembled Polyethylene Granule as a Template

Park

Kim

Yoo

et al. 2018

Journal of Nanomaterials

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We developed a novel method preparing nonspherical hollow silica particles (HSP) using a micron-sized granule self-assembled from partially oxidized PE wax. The morphology of the granule was closely investigated in terms of concentration and acid value of PE wax and cooling rate. Due to the oxidized unit in PE wax, magnetic nanoparticle was incorporated into the granule during the self-assembly, and silica was coated on the granule surface via the self-assembly. Silica-coating condition was studied by varying water content and reaction time. After the PE wax was removed by calcination, nonspherical HSP or magnetic HSP was obtained. This cost-effective HSP is expected to be useful for practical applications.

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Ceramic hollow spheres and their applications

Cited by 181 publications

References 6 publications

Ceramic microparticles and capsules via microfluidic processing of a preceramic polymer

Ceramic microparticles and capsules via microfluidic processing of a preceramic polymer

Formation of TiO<sub>2</sub> Hollow Nanoparticles via Gas Phase Synthesis using Titanium Oxide Acetylacetonate as a Precursor

Fabrication of Hollow Silica Particles Using a Self-Assembled Polyethylene Granule as a Template

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