A facile method of synthesis of asymmetric hollow silica spheres

Yuan, Junjie; Wang, Zhengqi

doi:10.1016/j.jcis.2011.06.022

Cited by 6 publications

(2 citation statements)

References 41 publications

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“…Up to now, various synthetic techniques such as spray drying [14,20], interfacial polymerization [21,22], self-assembly [5,11], layer-by-layer (LBL) fabrication [23,24], and templating have been established for making hollow silica particles. Among these methods, the templating method is popular, which uses polymeric spheres [8][9][10][25][26][27], micelles [6,28], droplets [7,[29][30][31], and inorganic particles [3,16,19] as templates. These templating approaches involve multi-steps such as preparation of template, coating of the template particles to form silica shell, and removal of the template [32].…”

Section: Introductionmentioning

confidence: 99%

A facile two-step etching method to fabricate porous hollow silica particles

Meng

Xiang

Zhang

et al. 2012

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 99%

A facile two-step etching method to fabricate porous hollow silica particles

Meng

Xiang

Zhang

et al. 2012

Journal of Colloid and Interface Science

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“…It was reported that colloid SiO 2 would carry a negative charge when pH > 3 [45]. The following equilibriums existed in the intermediate between the liquid and solid interfaces [48]:…”

Section: Resultsmentioning

confidence: 99%

A facile approach to synthesize SiO2 · Re2O3 (Re = Y, Eu, La, Sm, Tb, Pr) hollow sphere and its application in drug release

Zhu

Liu

et al. 2013

Nanoscale Res Lett

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Multifunctional SiO2 · Re2O3 (Re = Y, Eu, La, Sm, Tb, Pr) hollow spheres (HSs) have been fabricated using an acidic Re3+ ion solution. Under ultraviolet radiation, functional HSs emit different colors of light according to the different rare-earth ions embedded into the shell of SiO2 hollow spheres. The as-prepared hollow capsules were characterized by X-ray diffraction, transmission electron microscopy, high-resolution transmission electron microscopy, Brunauer-Emmett-Teller method, scanning electron microscopy, and energy-dispersive spectrometry. Drug loading and release experiments have been carried out using SiO2 · Eu2O3 HSs that acted as drug carriers. The results demonstrate that the multifunctional HSs exhibit a high storage capacity and the ability of retaining drug stability and activity, which indicates that the as-synthesized fluorescent hollow capsules are a potential candidate as drug delivery materials.

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Facile Fabrication of Monodisperse Micron‐Sized Dual Janus Silica Particles with Asymmetric Morphology and Chemical Environment

Wang

Wei

et al. 2023

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transportation. Zheng's group [15] synthesized a N-doped hollow porous carbon bowls, resulting in a favorable electrochemical performance. In addition, Janus particles with asymmetric surface chemical environment are efficiently synthesized. For example, Yang's group [16] prepared a amphiphilic silica particles at the liquid-liquid interface. Liu and co-workers [17] fabricated a dual functionalized Janus nanoparticle, in which a tumor-targeting ligand was modified on the one side and a charge reversal group on the other side, thus performing excellent anti-tumor therapy. The asymmetric morphology or surface chemical environment was intentionally fabricated in the particles, which have performed an excellent properties in some specific fields. [18] Therefore, if the asymmetric morphology and asymmetric surface chemical environment could be integrated into particles together, the application scope of Janus particles could be further expanded.Compared with symmetrical particles, Janus particles can realize a variety of functions in "one material", and is widely applied in interfacial catalysis, [19] bio-medicine, [20] energy storage, [21] micromotor [22] and oil-water separation [23] fields. In many Janus particle families, the Janus silica particles with ordered porous structure were accurately designed and fabricated because of excellent chemical stability and biocompatibility. More binding sites and each component could work independently or cooperatively to bring into full play of their respective advantages, so as to acquire unusual excellent performance in some specific applications. [24] Yu's group [25] fabricated a kind of Janus silica nanoparticles with tunable head-tail ordered pore structures, which enhanced biocompatibility with immune cells. Li and co-workers first designed a dual compartment Janus mesoporous silica nanoparticle via an anisotropic growth-induced strategy, [26] which could precisely release drugs. Furthermore, a tunable amphiphilicity Janus mesoporous silica nanoparticle was also fabricated, [27] which could improve biphasic catalysis efficiency. Although there were more Janus silica particles with ordered pores, exhibiting satisfactory performances in different applications, further well-defined chemical environment of pores in these particles were less reported. At present, the uniform modification of fully porous silica particles has extremely matured, [28] but the precise modification of ordered pores in Janus silica particles still encounters a great challenge.Janus particles are a kind of materials with asymmetric morphology or surface chemical environment. But so far, the preparation of particles with dual asymmetry is still a challenging problem. Hence the cation surfactant hexadecyl trimethyl ammonium bromide and co-surfactant octadecylamine are applied to improve the Pickering emulsion stability, and the micron-sized silica particles are arranged in a single layer at the toluene-water interface through electrostatic interaction. Furthermore, organosilane reagents are added in ...

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A facile method of synthesis of asymmetric hollow silica spheres

Cited by 6 publications

References 41 publications

A facile two-step etching method to fabricate porous hollow silica particles

A facile two-step etching method to fabricate porous hollow silica particles

A facile approach to synthesize SiO2 · Re2O3 (Re = Y, Eu, La, Sm, Tb, Pr) hollow sphere and its application in drug release

Facile Fabrication of Monodisperse Micron‐Sized Dual Janus Silica Particles with Asymmetric Morphology and Chemical Environment

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