Size- and charge-controllable polystyrene spheres for templates in the preparation of porous silica particles with tunable internal hole configurations

Nandiyanto, Asep Bayu Dani; Suhendi, Asep; Ogi, Takashi; Umemoto, Ryohei; Okuyama, Kikuo

doi:10.1016/j.cej.2014.07.005

Cited by 39 publications

(25 citation statements)

References 45 publications

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“…In our previous studies, we successfully produced inorganic oxide particles with controllable sizes, morphologies, and crystallinities [1,[11][12][13][14][15]. In the case of WO 3 , the WO 3 particles were prepared from various ammonium tungstate raw materials.…”

Section: Introductionmentioning

confidence: 99%

Influences of Temperature on the Conversion of Ammonium Tungstate Pentahydrate to Tungsten Oxide Particles with Controllable Sizes, Crystallinities, and Physical Properties

et al. 2018

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The purpose of this study was to investigate influences of temperature on the conversion of ammonium tungstate pentahydrate (ATP) to yellowish green). The relationships between the reaction temperatures and the physicochemical properties of the ATP were also investigated in detail along with the theoretical consideration and the proposal of the WO 3 particle formation mechanism. In simplification, the phenomena can be described into three zones of temperatures: (1) Below 250 °C (release of water molecules and some ammonium ions); (2) At 250-400 °C (release of water molecules and ammonium ions, restructurization of tungsten and oxygen elements, and formation of amorphous tungsten trioxide); and (3) At higher than 400 °C (crystallization of tungsten trioxide

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Section: Introductionmentioning

confidence: 99%

Influences of Temperature on the Conversion of Ammonium Tungstate Pentahydrate to Tungsten Oxide Particles with Controllable Sizes, Crystallinities, and Physical Properties

et al. 2018

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“…3(b) and 3(c). The hollow spheres were prepared using a PS template method as described previous study [39,[44][45][46]. In this method, silica-alumina composite primary particles were prepared using a sol-gel method, and the primary particles were deposited on the surface of PS template particles to form composite shells [44,[47][48][49].…”

Section: Resultsmentioning

confidence: 99%

“…Hollow spheres have been prepared using many templates such as silica particles, carbon particles, bacteria, and polymer particles [3337]. In particular, polystyrene (PS) particles have attracted a great deal of attention as templates because they are easily removed using either heat treatment or solvent dissolution, and they produce well-defined and monodispersed hollow spheres [38,39].…”

Section: Introductionmentioning

confidence: 99%

Influence of morphology of hollow silica–alumina composite spheres on their activity for hydrolytic dehydrogenation of ammonia borane

et al. 2017

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Hollow silica-alumina composite spheres were prepared by a polystyrene (PS) template method using various amounts of PS suspension. Homogeneous hollow spheres prepared using 40 g were found to be with a diameter of about 300 nm in scanning electron microscopy, and transmission electron microscopy demonstrated their hollow sphere morphology. From the nitrogen adsorption isotherm results, the homogeneous hollow spheres prepared using 40 g of the PS suspension were found to be an ordered pore structure. The activities of the hollow spheres prepared using various amounts of the PS suspension for hydrolytic dehydrogenation of ammonia borane were compared. The results showed that 10, 7, and 6 mL of hydrogen were evolved from the aqueous ammonia borane solution in about 40 min in the presence of the hollow spheres prepared using 40, 80, and 120 g of PS suspension, respectively. The homogeneous hollow spheres with an ordered pore structure showed the highest activity among all the hollow spheres. The amount of acid sites and the coordination number of aluminum active species were characterized using neutralization titration and solid-state 27 Al magic angle spinning nuclear magnetic resonance spectroscopy. The homogeneous hollow spheres with an ordered pore structure had high amount of acid sites and 4-coordinated aluminum species. The relative proportion of 4-coordinated aluminum species was related to the dispersion of aluminum species. These results indicate that the homogeneous hollow spheres with an ordered pore structure showed the high activity because of high amount of acid sites induced by the highly dispersed aluminum species.

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“…Hal ini disebabkan silika memiliki sifat yang terbukti memiliki stabilitas tinggi, fleksibilitas kimia, dan biokompatibilitas yang berperan penting bagi berbagai lingkup (Nandiyanto et al, 2014). Silika di alam dapat diperoleh dari mineral dan bahan nabati.…”

Section: Pendahuluanunclassified

Silika pada Togkol Jagung yang Dikarakterisasi Menggunakan Spektroskopi Infra Merah dan Difraksi Sinar-X

Wardhani¹

2017

JKR

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AbstrakPenelitian ini dilakukan untuk mengisolasi silika pada tongkol jagung menggunakan HCl dengan variasi suhu perendaman. Silika yang diperoleh dikarakterisasi ikatan dan strukturnya menggunakan spektroskopi infra merah dan difraksi sinar-X. Silika dari serbuk tongkol jagung diperoleh dengan cara nontermal melalui perendaman dengan HCl pada suhu kamar dan suhu 60˚C selama 3 jam dan cara termal melalui pembakaran pada suhu 800˚C. Silika yang diperoleh dikarakterisasi ikatannya dan diperoleh pita serapan karakteristik silika muncul pada bilangan gelombang 1101, 794, dan 468 cm -1 . Struktur silika yang dikarakterisasi menggunakan difraktometer sinar-X menunjukkan fase amorf silika pada 2θ = 21 -25 ᵒ dan mulai terbentuk fase kristalin pada 2θ = 26 ᵒ . Kata kunci: Silika pada tongkol jagung, spektroskopi infra merah, difraksi sinar-X AbstractThis study was conducted to isolate the silica on a corn cob using HCl with soaking temperature variation. The silica was characterized bonding and structure using infrared spectroscopy and X-ray diffraction. Silica of corn cob powder obtained by nontermal through immersion with HCl at room temperature and at 60 ᵒ C for 3 hours and thermal way through burning at 800 ᵒ C. The silica was characterized bondage and obtained an absorption band characteristic of silica appears at wave number 1101, 794, and 468 cm -1 . Silica structure characterized using X-ray diffraction that showed the amorphous phase silica 2θ˚ = 21 -25 ᵒ and begin to form the crystalline phase in 2θ˚ = 26 ᵒ .

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Size- and charge-controllable polystyrene spheres for templates in the preparation of porous silica particles with tunable internal hole configurations

Cited by 39 publications

References 45 publications

Influences of Temperature on the Conversion of Ammonium Tungstate Pentahydrate to Tungsten Oxide Particles with Controllable Sizes, Crystallinities, and Physical Properties

Influences of Temperature on the Conversion of Ammonium Tungstate Pentahydrate to Tungsten Oxide Particles with Controllable Sizes, Crystallinities, and Physical Properties

Influence of morphology of hollow silica–alumina composite spheres on their activity for hydrolytic dehydrogenation of ammonia borane

Silika pada Togkol Jagung yang Dikarakterisasi Menggunakan Spektroskopi Infra Merah dan Difraksi Sinar-X

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