Strategies to control zeolite particle morphology

Li, Shiying; Li, Junfen; Dong, Mei; Fan, Shangwu; Zhao, Tiansheng; Wang, Jianguo; Fan, Wei

doi:10.1039/c8cs00774h

Cited by 173 publications

(110 citation statements)

References 245 publications

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“…Zeolites for industrial applications are conventionally synthesized through hydrothermal processes, where the oligomerization of poly-silicic acids is crucial [3]. People have come to realize the significant roles of the concentration of silicate precursors, pH values of the reaction mixture, and the reaction temperatures to the formed framework structure and crystallinity of the zeolite materials [14,15,16]. However, due to the complexity of the hydrothermal reaction and the lack of suitable experimental techniques, limited knowledge has been gained at molecular level on the oligomerization of poly-silicic acids, especially at the initial nucleation and during the growth of zeolite materials, even though they are crucial [17,18,19,20].…”

Section: Introductionmentioning

confidence: 99%

Oligomerization of Silicic Acids in Neutral Aqueous Solution: A First-Principles Investigation

Liu

Meng

2019

IJMS

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Crystallite aluminosilicates are inorganic microporous materials with well-defined pore-size and pore-structures, and have important industrial applications, including gas adsorption and separation, catalysis, etc. Crystallite aluminosilicates are commonly synthesized via hydrothermal processes, where the oligomerization of silicic acids is crucial. The mechanisms for the oligomerization of poly-silicic acids in neutral aqueous solution were systematically investigated by extensive first-principles-based calculations. We showed that oligomerization of poly-silicic acid molecules proceeds through the lateral attacking and simultaneously proton transfer from the approaching molecule for the formation of a 5-coordinated Si species as the transition state, resulting in the ejection of a water molecule from the formed poly-silicic acid. The barriers for this mechanism are in general more plausible than the conventional direct attacking of poly-silicic acid with reaction barriers in the range of 150–160 kJ/mol. The formation of linear or branched poly-silicic acids by intermolecular oligomerization is only slightly more plausible than the formation of cyclic poly-silicic acids via intramolecular oligomerization according to the reaction barriers (124.2–133.0 vs. 130.6–144.9 kJ/mol). The potential contributions of oligomer structures, such as the length of the linear oligomers, ring distortions and neighboring linear branches, etc., to the oligomerization were also investigated but found negligible. According to the small differences among the reaction barriers, we proposed that kinetic selectivity of the poly-silicic acids condensation would be weak in neutral aqueous solution and the formation of zeolite-like structures would be thermodynamics driven.

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Section: Introductionmentioning

confidence: 99%

Oligomerization of Silicic Acids in Neutral Aqueous Solution: A First-Principles Investigation

Liu

Meng

2019

IJMS

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“…Imaging-guided chemo-photodynamic dual-mode therapy is a novel modality of cancer theranostics, which can improve therapeutic efficiency with minimized side effects and avoid the burden of multiple injections of different therapeutic agents in clinical applications. 8,108,109 Liu and co-workers 20 developed a kind of theranostic agent (Co-NPs) which was constructed by self-assembly of a paclitaxel (PTX, 110 an anti-tumor drug for ovarian and breast cancer) dimer and two-photo photosensitizer (Fig. 10a).…”

Section: Fluorescence Imaging-guided Cht and Pdtmentioning

confidence: 99%

Activatable molecular agents for cancer theranostics

et al. 2020

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Theranostics that integrates diagnosis and treatment modalities has attracted great attention due to its abilities of personalized therapy and real-time monitoring of therapeutic outcome. Such a theranostic paradigm requires agents to simultaneously possess the capabilities of targeting, imaging, and treatment. Activatable molecular agents (AMAs) are promising for cancer theranostics, as they show a higher signal-to-noise ratio (SNR), real-time detection of cancer-associated biomarkers, lower normal tissue toxicity, and a higher therapeutic effect. This perspective summarizes the recent advancements of AMAs, which include imagingguided chemotherapy, imaging-guided photodynamic therapy, and imaging-guided photothermal therapy.The molecular design principles, theranostic mechanisms, and biomedical applications of AMAs are described, followed by a discussion of potential challenges of AMAs in cancer theranostics.

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“…The basic building unit of zeolite structure is the individual tetrahedra with center of Al 3+ , Si 4+ , or other small ions with electrovalence of IV or more. [106][107][108] The secondary building unit (SBU) consists of selected geometric groupings of primary tetrahedra linked by oxygen bridge. [109,110] There are nine such building units, which can be used to describe all of the known zeolite structures.…”

Section: Preparation Of Nanocarbon Materials In Zeolites Templatesmentioning

confidence: 99%

Revival of Zeolite‐Templated Nanocarbon Materials: Recent Advances in Energy Storage and Conversion

et al. 2020

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Nanocarbon materials represent one of the hottest topics in physics, chemistry, and materials science. Preparation of nanocarbon materials by zeolite templates has been developing for more than 20 years. In recent years, novel structures and properties of zeolite-templated nanocarbons have been evolving and new applications are emerging in the realm of energy storage and conversion. Here, recent progress of zeolite-templated nanocarbons in advanced synthetic techniques, emerging properties, and novel applications is summarized: i) thanks to the diversity of zeolites, the structures of the corresponding nanocarbons are multitudinous; ii) by various synthetic techniques, novel properties of zeolite-templated nanocarbons can be achieved, such as hierarchical porosity, heteroatom doping, and nanoparticle loading capacity; iii) the applications of zeolite-templated nanocarbons are also evolving from traditional gas/vapor adsorption to advanced energy storage techniques including Li-ion batteries, Li-S batteries, fuel cells, metal-O 2 batteries, etc. Finally, a perspective is provided to forecast the future development of zeolite-templated nanocarbon materials.

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Strategies to control zeolite particle morphology

Abstract: Methods to synthesize zeolites with different crystal habits and assemble zeolite crystals into specific structures are reviewed for the rational design of zeolite particle morphologies.

Cited by 173 publications

References 245 publications

Oligomerization of Silicic Acids in Neutral Aqueous Solution: A First-Principles Investigation

Oligomerization of Silicic Acids in Neutral Aqueous Solution: A First-Principles Investigation

Activatable molecular agents for cancer theranostics

Revival of Zeolite‐Templated Nanocarbon Materials: Recent Advances in Energy Storage and Conversion

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