The preparation and the sustained release of titanium dioxide hollow particles encapsulating L-ascorbic acid

Tominaga, Yoko; Kadota, Kazunori; Shimosaka, Atsuko; Yoshida, Mikio; Oshima, Kentaro; Shirakawa, Yoshiyuki

doi:10.1016/j.jcrysgro.2018.03.008

Cited by 6 publications

(5 citation statements)

References 27 publications

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“…Another example of functionalization by charging vitamins into the hollow particles was profiled (Tominaga et al, 2018;2019).…”

Section: Release Properties Of Vitamins From Tio 2 Porous Hollow Partmentioning

confidence: 99%

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Particle Preparation and Morphology Control with Mutual Diffusion Across Liquid-Liquid Interfaces

Kadota

Shirakawa

2021

KONA

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Advanced functional materials require sophisticated control of particle characteristics. The bottom-up process has been extensively used to produce functional materials for controlling the particle properties of composite particles. We propose crystallization at liquid-liquid interfaces as an advanced particle formation method. This review introduces crystallization at a liquid-liquid interface based on several case studies used in various applications. Conventional crystallization has been generally used to produce crystals and particles with homogeneous particle properties. Liquid-liquid interfacial crystallization makes it possible to create composite particles with hetero-phase structures and interfaces. Liquid-liquid interfacial crystallization with an inkjet technique can control the droplet size accurately, and the shape and particle size distribution are successfully controlled in inorganic-organic composite particles. In addition, we succeed in creating organic-organic composite particles using the interfacial crystallization by an ultrasonic spray nozzle. The coating efficiency of organic particles on the particles is enhanced using the ultrasonic spray nozzle in comparison with anti-solvent crystallization. In this study, the fabrication of inorganic-organic composite particles using a coaxial tube reactor on the liquid-liquid interfacial crystallization is proven successful. These findings suggest that liquid-liquid interfacial crystallization is a promising means of efficiently producing composite particles because of their applicability to infusion in various processes.

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“…Another example of functionalization by charging vitamins into the hollow particles was profiled (Tominaga et al, 2018;2019).…”

Section: Release Properties Of Vitamins From Tio 2 Porous Hollow Partmentioning

confidence: 99%

“…Time evolution of L-ascorbic acid concentration released from a sample (L-Asc) and bare specimen after UV irradiation for 12 h. Reprinted with permission from Ref (Tominaga et al, 2018)…”

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confidence: 99%

Particle Preparation and Morphology Control with Mutual Diffusion Across Liquid-Liquid Interfaces

Kadota

Shirakawa

2021

KONA

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“…Therefore, particle can be constructed spherical shape by inkjet process resulted. 38) The shell structure also is strong to thermal stress, and TiO 2 particles could remain spherical shape even after calcination. Cross-sectional SEM images of the TiO 2 particles prepared by inkjet process that were cut by the ion milling apparatus and element mapping of the inner surfaces are shown in Fig.…”

Section: Difference In Tio 2 Particles Morphology Between the Inkjet mentioning

confidence: 99%

“…The urea solution could be introduced into the hollow particles of TiO 2 through the pores by restoring atmospheric pressure. 38) The urea crystals would precipitate within the confined hollow space of TiO 2 particles during drying. The final sintering process may induce ammonia from nitrogen supply source by decomposing the urea within the hollow space.…”

Section: Speculated Formation Mechanism Of Ndopant Tio 2 Particlesmentioning

confidence: 99%

Novel preparation method of nitrogen-doped TiO<sub>2</sub> hollow particles by the reaction crystallization in refined droplet

Tominaga

Kadota

Oshima

et al. 2019

J. Ceram. Soc. Japan

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We succeeded in fabricating the uniform spherical titanium oxide (TiO 2) hollow particles improved photocatalytic activity by doping nitrogen under visible light irradiation using new processing. To prepare the uniform spherical nitrogen-doped TiO 2 particles with monodispersed size distribution and monodispersed pore distribution, we performed the reaction crystallization within the confined droplet by inkjet nozzle. The absorption edge of the TiO 2 particles shifted to the lower wavelength side with an increase in the sintering temperature. TiO 2 particles prepared by an inkjet process exhibited spherical porous structures with uniform size distribution, resulting that this process would be controllable to nitrogen-doped TiO 2 particles. The results indicated that the chemical states of the nitrogen doping and the light absorption characteristics of the TiO 2 particles could be controlled by the sintering temperature.

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“…The sol–gel processing of the TiO 2 can occur at the LLI. Titanium alkoxides are usually dissolved in organic solvent immiscible with water providing self-dissociation reactions products (H 3 O + or OH − ) catalyzing hydrolysis and condensation reactions happening at the LLI [ 13 , 14 , 15 ]. To the best of our knowledge, such reactions have not been investigated at the electrified LLI to date.…”

Section: Introductionmentioning

confidence: 99%

Interfacial Deposition of Titanium Dioxide at the Polarized Liquid–Liquid Interface

et al. 2022

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The interfacial polycondensation of titanium dioxide was studied at the bare and fiberglass membrane supported polarized liquid–liquid interface (LLI). Titanium dioxide synthesis was derived from the titanium (IV) tetrabutoxide (initially dissolved in the 1,2-dichloroethane) interfacial hydrolysis followed by its condensation. Experimental parameters, such as the pH of the aqueous phase and the influence of titanium alkoxide concentration in the organic phase on the electrochemical signal and material morphology, were investigated. The latter was achieved with fiberglass membranes used as the LLI support during TiO2 interfacial deposition. Cyclic voltammetry was used for the in situ studies, whereas scanning electron microscopy, energy-dispersive X-ray spectroscopy, and infrared spectroscopy were used during ex situ examination. The interfacial polycondensation reaction could be studied using electrified LLI and resulted in the material being a TiO2 film alone or film decorated with particles.

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The preparation and the sustained release of titanium dioxide hollow particles encapsulating L-ascorbic acid

Cited by 6 publications

References 27 publications

Particle Preparation and Morphology Control with Mutual Diffusion Across Liquid-Liquid Interfaces

Particle Preparation and Morphology Control with Mutual Diffusion Across Liquid-Liquid Interfaces

Novel preparation method of nitrogen-doped TiO<sub>2</sub> hollow particles by the reaction crystallization in refined droplet

Interfacial Deposition of Titanium Dioxide at the Polarized Liquid–Liquid Interface

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