Fractal-in-a-Sphere: Confined Self-Assembly of Fractal Silica Nanoparticles

Fu, Joseph; Jiao, Jinqing; Song, Hao; Gu, Zhengying; Yang, Liu; Geng, Jing; Jack, Kevin S.; Du, Ai; Tang, Jie; Yu, Chengzhong

doi:10.1021/acs.chemmater.9b03864

Cited by 45 publications

(25 citation statements)

References 50 publications

(78 reference statements)

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“…Recently, Fu and co‐authors reported the synthesis of MSNs with tree‐branch‐like morphology: fractal silica nanoparticles with tunable fractal generations and uniform particle sizes (Figure 14 a–f) [28] . In this synthesis, TEOS, 3‐aminophenol (AP)/formaldehyde (F), and ethylenediamine (EDA) were used in the Stöber system.…”

Section: Synthesis Structures and Formation Mechanisms Of Dmsnsmentioning

confidence: 99%

“…the Webo fS cience under the keywords "dendritic mesoporous silica" or "fibrous mesoporous silica" or "radial mesoporous silica", indicating the growing attention on this type of MSN in recent years.However,there is an ongoing debate on their structures and formation mechanisms,a sr eflected by many terminologies used to describe the structures,s uch as "dendritic", [18][19][20][21][22][23] "dendrimer-like", [24,25] "fibrous", [26] "wrinkle", [27] "radial", [7] "fractal", [28] "chrysanthemum-like", [29] "dandelion-type", [30] "stellate" [31] and "core-cone shaped", [14,32] usually accompanying various proposed assembly mechanisms.T he main reason for the controversy may come from the limitations of the characterization methods to examine these nanoparticles which have complicated pore structures without ordered mesostructures." DMSNs" is the most common name used to describe all those types of MSNs, [7,33,34] even though some of them have clear structure differences.…”

Section: Introductionmentioning

confidence: 99%

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Dendritic Mesoporous Nanoparticles: Structure, Synthesis and Properties

Xu,

Lei,

Wang

et al. 2022

Angew Chem Int Ed

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Recently, dendritic mesoporous silica nanoparticles with widespread applications have attracted great interest. Despite many publications (>800), the terminology “dendritic” is ambiguous. Understanding what possible “dendritic structures” are, their formation mechanisms and the underlying structure–property relationship is fundamentally important. With the advance of characterization techniques such as electron tomography, two types of tree‐branch‐like and flower‐like structures can be distinguished, both described as “dendritic” in the literature. In this Review, we start with the definition of “dendritic”, then provide critical analysis of reported dendritic silica nanoparticles according to their structural classification. We update the understandings of the formation mechanisms of two types of “dendritic” nanoparticles, highlighting how to control their structural parameters. Applications of dendritic mesoporous nanoparticles are also reviewed with a focus on the biomedical field, providing new insights into the structure–property relationship in this family of nanomaterials.

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Section: Synthesis Structures and Formation Mechanisms Of Dmsnsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dendritic Mesoporous Nanoparticles: Structure, Synthesis and Properties

Xu,

Lei,

Wang

et al. 2022

Angew Chem Int Ed

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“…The low mass‐transfer‐limitation of the precursors in the radial direction favored the radial growth of the resin and silica restricted in the shells. [ 52 ] As a result, large center‐radial pores could be obtained after removing the resin component from the composite spheres. Increasing the NH 3 ·H 2 O concentration could lead to a faster gelation of resin and silica particles and reduce their size.…”

Section: Resultsmentioning

confidence: 99%

Quantitative Coassembly for Precise Synthesis of Mesoporous Nanospheres with Pore Structure‐Dependent Catalytic Performance

Mei

Rui

et al. 2021

Advanced Materials

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Precise synthesis of porous materials is essential for their applications. Self‐assembly is a widely used strategy for synthesizing porous materials, but quantitative control of the assembly process still remains a great challenge. Here, a quantitative coassembly approach is developed for synthesizing resin/silica composite and its derived porous spheres. The assembly behaviors of the carbon and silica precursors are regulated without surfactants and the growth kinetics of the composite spheres are quantitatively controlled. This assembly approach enables the precise control of the size and pore structures of the derived carbon spheres. These carbon spheres provide a good platform to explore the structure–performance relationships of porous materials, and demonstrate their pore structure‐dependent performance in catalytic water decontamination. This work provides a simple and robust approach for precise synthesis of porous spheres and brings insights into function‐oriented design of porous materials.

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“…Recently, Fu et al reported a confined self-assembly method for the preparation of fractal silica nanoparticles with tetraethyl orthosilicate (TEOS), 3-aminophenol/formaldehyde, and ethylenediamine (EDA) in a surfactant-free sol-gel system [ 31 ]. The prepared fractal silica nanoparticles have a dendritic structure with large center-radial vertical mesopores.…”

Section: Introductionmentioning

confidence: 99%

Dendritic Mesoporous Silica Hollow Spheres for Nano-Bioreactor Application

Zhang

Fang

et al. 2022

Nanomaterials

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Mesoporous silica materials have attracted great research interest for various applications ranging from (bio)catalysis and sensing to drug delivery. It remains challenging to prepare hollow mesoporous silica nanoparticles (HMSN) with large center-radial mesopores that could provide a more efficient transport channel through the cell for guest molecules. Here, we propose a novel strategy for the preparation of HMSN with large dendritic mesopores to achieve higher enzyme loading capacity and more efficient bioreactors. The materials were prepared by combining barium sulfate nanoparticles (BaSO4 NP) as a hard template and the in situ-formed 3-aminophenol/formaldehyde resin as a porogen for directing the dendritic mesopores’ formation. HMSNs with different particle sizes, shell thicknesses, and pore structures have been prepared by choosing BaSO4 NP of various sizes and adjusting the amount of tetraethyl orthosilicate added in synthesis. The obtained HMSN-1.1 possesses a high pore volume (1.07 cm3 g−1), a large average pore size (10.9 nm), and dendritic mesopores that penetrated through the shell. The advantages of HMSNs are also demonstrated for enzyme (catalase) immobilization and subsequent use of catalase-loaded HMSNs as bioreactors for catalyzing the H2O2 degradation reaction. The hollow and dendritic mesoporous shell features of HMSNs provide abundant tunnels for molecular transport and more accessible surfaces for molecular adsorption, showing great promise in developing efficient nanoreactors and drug delivery vehicles.

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Fractal-in-a-Sphere: Confined Self-Assembly of Fractal Silica Nanoparticles

Cited by 45 publications

References 50 publications

Dendritic Mesoporous Nanoparticles: Structure, Synthesis and Properties

Dendritic Mesoporous Nanoparticles: Structure, Synthesis and Properties

Quantitative Coassembly for Precise Synthesis of Mesoporous Nanospheres with Pore Structure‐Dependent Catalytic Performance

Dendritic Mesoporous Silica Hollow Spheres for Nano-Bioreactor Application

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