An Efficient Route to Rattle-Type Fe3O4@SiO2 Hollow Mesoporous Spheres Using Colloidal Carbon Spheres Templates

Zhu, Yufang; Kockrick, Emanuel; Ikoma, Toshiyuki; Hanagata, Nobutaka; Kaskel, Stefan

doi:10.1021/cm900956j

Cited by 241 publications

(179 citation statements)

References 40 publications

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“…However, our preparation method of the mMSHCs provided the Ms value comparable to the reported magnetic capsules [8][9][10][11][12][13][14][15][16][17][18]. As shown in Figure 6(b), the Ms value of our mMSHCs was large enough to show a magnetic separation using a neodymium magnet.…”

Section: Icomf16-lb16supporting

confidence: 72%

“…Specifically, the magnetic properties allow the magnetically-guided drug delivery for the therapy and the contrast-enhanced magnetic resonance imaging for the diagnosis. So far, various types of mMSHCs have been reported; the mMSHC incorporating the mNPs on the outer surface of the shell [7], inside the shell [8,9], or in the hollow cavity [10][11][12] and the rattle-type mMSHC that encapsulates one magnetic particle in its hollow cavity [13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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Mesoporous silica hollow capsules embedded with magnetic nanoparticles

2017

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Abstract. Our method for synthesizing the mesoporous silica hollow capsules (MSHCs) was combined with the Layer-by-Layer method to integrate the magnetic nanoparticles (mNPs) onto the core template for the MSHC synthesis. The resultant magnetic MSHCs (mMSHCs) were monodisperse as the conventional MSHCs, and the mNPs were embedded on the inner surface of the mesoporous silica shell. The same mesoporous structure as in the MSHCs was confirmed in the mMSHCs and the properties of the mNPs were maintained even after being incorporated into the mMSHCs.

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Section: Icomf16-lb16supporting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Mesoporous silica hollow capsules embedded with magnetic nanoparticles

2017

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“…[33][34] The Dye/HMS-NH 2 particles were prepared following the literature procedures after a little modification. [17] Typically, 500 mg of HMS particles Dye/HMS-NH 2 /CpG suspensions were used for gel electrophoresis experiment.…”

Section: Preparation Of the Dye-loaded And Aminated Hms Particles (Dymentioning

confidence: 99%

“…1, HMS particles were prepared by using a carbon sphere templating method reported in our previous work. [33][34] Reports on such an enzyme-triggered drug delivery system have not been found before.…”

Section: Introductionmentioning

confidence: 99%

Cytosine-phosphodiester-guanine oligodeoxynucleotide (CpG ODN)-capped hollow mesoporous silica particles for enzyme-triggered drug delivery

2011

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Abstract:We designed, for the first time, an enzyme-triggered drug delivery system that is based on cytosine-phosphodiester-guanine oligodeoxynucleotide (CpG ODN)-capped hollow mesoporous silica (HMS) particles as carriers. Fluorescein dye was used as a model drug, and the fluorescein loading, amino-grafting and CpG ODN capping were evaluated by UV/Vis analysis, zeta potential and N 2 adsorption-desorption measurements and gel electrophoresis. The fluorescein loading capacity and CpG ODN capping amount were 37.7 and 39.6 µg/mg, respectively at the weight ratio of 10 Dye/HMS-NH 2 /CpG ODN. Importantly, fluorescein release can be triggered by the addition of deoxyribonuclease I (DNase I) for CpG ODN degradation, and the release rate can also be controlled by changing the DNase I concentration. Therefore, it might be a promising controlled drug delivery system for application in the field of biomedicine and cancer therapy.

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“…MNPs with different sizes were synthesized [10,13,17,18] and modified with metal, oxide, an organic group, a polymer, and even a biomacromolecule for various purposes [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. Among them, MNP sorbents have been functionalized with special ligands by forming mixed hemimicelles [21][22][23] (temporary combination) or by covalent modification [17,24,25] (permanent combination) and used to extract target molecules from environmental water samples by many research groups.…”

Section: Spementioning

confidence: 99%

Preparation of a chitosan-coated C18-functionalized magnetite nanoparticle sorbent for extraction of phthalate ester compounds from environmental water samples

et al. 2010

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Novel superparamagnetic chitosan-coated C 18 -functionalized magnetite nanoparticles (MNPs) were successfully synthesized and applied as an effective sorbent for the preconcentration of several typical phthalate ester compounds from environmental water samples. The MNPs were 20 nm in diameter and had a high magnetic saturation value (52 emu g −1 ), which endowed the sorbent with a large surface area and the convenience of isolation from water samples. Phthalate esters could be extracted by the interior octadecyl groups through hydrophobic interaction. The hydrophilic porous chitosan polymer coating promoted the dispersion of MNPs in water samples, and improved the anti-interference ability of the sorbent without influencing the adsorption of analytes. The main factors affecting the adsorption of phthalate esters, including the pH of the solution, humic acid, sample loading volume, adsorption time, and desorption conditions, were investigated and optimized. Under the conditions selected (pH 11, adsorption time 20 min, elution with 10 mL of acetonitrile, and concentration to 0.5 mL), concentration factors of 1,000were achieved by extracting 500 mL of several environmental water samples with 0.1 g of MNP sorbent. The method detection limits obtained for di-n-propyl phthalate, di-n-butyl phthalate, dicyclohexyl phthalate, and di-n-octyl phthalate were 12.3, 18.7, 36.4, and 15.6 ng L −1 , respectively. The recoveries of spiked samples ranged from 60 to 100%, with a low relative standard deviation (1-8%), which indicated good method precision.

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An Efficient Route to Rattle-Type Fe₃O₄@SiO₂ Hollow Mesoporous Spheres Using Colloidal Carbon Spheres Templates

Cited by 241 publications

References 40 publications

Mesoporous silica hollow capsules embedded with magnetic nanoparticles

Mesoporous silica hollow capsules embedded with magnetic nanoparticles

Cytosine-phosphodiester-guanine oligodeoxynucleotide (CpG ODN)-capped hollow mesoporous silica particles for enzyme-triggered drug delivery

Preparation of a chitosan-coated C18-functionalized magnetite nanoparticle sorbent for extraction of phthalate ester compounds from environmental water samples

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