Incorporation of well-dispersed sub-5-nm graphitic pencil nanodots into ordered mesoporous frameworks

Kong, Biao; Tang, Jing; Zhang, Yueyu; Jiang, Tongying; Gong, X. G.; Peng, Chengxin; Wei, Jing; Yang, Jianping; Wang, Yongcheng; Wang, Xianbiao; Zheng, Gengfeng; Selomulya, Cordelia; Zhao, Dongyuan

doi:10.1038/nchem.2405

Cited by 157 publications

(104 citation statements)

References 39 publications

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“…These applications often demand complex materials with several components or with particular, desired crystalline structures and structural ordering. For example, the incorporation of carbon nanodots into mesoporous TiO 2 frameworks is a very promising approach to further optimize the properties of the framework and achieve a sharp increase in the photocurrent density 216 . Another exciting study reports that high-surface-area mesoporous TiO 2 single crystals show substantially higher conductivities and electron mobilities than those observed for state-of-the-art titania nanocrystals 217 .…”

Section: Discussionmentioning

confidence: 99%

Mesoporous materials for energy conversion and storage devices

2016

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At present, more than 80% of the energy consumed globally is derived from non-renewable fossil fuels such as coal, oil and natural gas. The combustion of these fuels inevitably leads to the emission of CO 2 -a main driver of climate change and other serious environmental effects, including the emission of other dangerous gases. Although mitigating climate change is a multifaceted challenge, one of the pillars of any future low-carbon economy will be a substantially increased dependence on renewable and environmentally friendly energy sources and storage systems. Tremendous progress is being made in developing advanced technologies to meet these challenges. However, to enable the cost-effective, large-scale production of these technologies, further improvement of performance and efficiency is needed. Although unique challenges exist for each technology, the development of functional materials is crucial.Porous solids -in particular, mesoporous solids -are appealing materials in many energy applications owing to their ability to absorb and interact with guest species (including, but not limited to, lithium ions, hydrogen atoms and sulfur molecules) on their outer and inner surfaces, and in the pore spaces 1,2 . According to the International Union of Pure and Applied Chemistry (IUPAC) definition, porous materials are classified into three categories according to their pore sizes: micro porous (<2 nm), mesoporous (2-50 nm) or macro porous (>50 nm). Since the first report of mesoporous silica in the 1990s 3,4 , the variety of mesoporous materials available has rapidly expanded, encompassing a very broad range of compositions.Mesoporous materials have exceptional properties, including ultrahigh surface areas, large pore volumes, tunable pore sizes and shapes, and also exhibit nanoscale effects in their mesochannels and on their pore walls. These features are particularly advantageous for applications in energy conversion and storage [5][6][7][8][9][10] . In principle, high surface areas should provide a large number of reaction or interaction sites for surface or interface-related processes such as adsorption, separation, catalysis and energy storage; however, a high surface area does not necessarily translate to an improved performance in applications. Large pore volumes have shown promise in the loading of guest species and in the accommodation of the expansion and strain relaxation during repeated electrochemical energy storage processes. Uniform and tunable mesopore channels facilitate the transport of atoms, ions and large molecules through the bulk of the material, thereby increasing the number of active sites with high accessibility and overcoming the size restriction encountered with microporous materials. In addition, there are fascinating nanoconfinement effects in the voids of uniform mesochannels, which are advantageous in catalysis and energy storage. 3D nanometre-sized frameworks can produce extraordinary nanoscale effects (that is, surface and quantum effects) that result in mesoporous materials with u...

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Section: Discussionmentioning

confidence: 99%

Mesoporous materials for energy conversion and storage devices

2016

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“…Recently, in addition to the core–shell structured MSNs, induction of luminescent functional factors within the mesopores can maintain the original host mesostructures and inspire a promising protocol to synthesizing well-defined functional MSNs. [14] A series of functional groups, such as organic, ionic, and photoactive molecules, have been incorporated into ordered mesoporous materials. [15] Owing to the relatively weak chemical stability of such functional factors in the complex in vivo physiological environment, the direct in situ growth of light-responsive nanocrystals, rather than just molecules or ions, into ordered mesoporous MSNs may offer remarkable advancement to the drug delivery platforms to achieve the real-time control of drug pharmacokinetics.…”

Section: Introductionmentioning

confidence: 99%

A Multifunctional Nanocrystalline CaF₂:Tm,Yb@mSiO₂ System for Dual‐Triggered and Optically Monitored Doxorubicin Delivery

Zhou

et al. 2016

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Daunting challenges in investigating the controlled release of drugs in complicated intracellular microenvironments demand the development of stimuli-responsive drug delivery systems. Here, a nanoparticle system, CaF2:Tm,Yb@mSiO2, made of a mesoporous silica (mSiO2) nanosphere with CaF2:Tm,Yb upconversion nanoparticles (UCNPs) is developed, filling its mesopores and with its surface-modified with polyacrylic acid for binding the anticancer drug molecules (doxorubicin, DOX). The unique design of CaF2:Tm,Yb@mSiO2 enables us to trigger the drug release by two mechanisms. One is the pH-triggered mechanism, where drug molecules are preferentially released from the nanoparticles at acidic conditions unique for the intracellular environment of cancer cells compared to normal cells. Another is the 808 nm near infrared (NIR)-triggered mechanism, where 808 nm NIR induces the heating of the nanoparticles to weaken the electrostatic interaction between drug molecules and nanoparticles. In addition, luminescence resonance energy transfer occurs from the UCNPs (the energy donor) to the DOX drug (the energy acceptor) in the presence of 980 nm NIR irradiation, allowing us to monitor the drug release by detecting the vanishing blue emission from the UCNPs. This study demonstrates a new multifunctional nanosystem for dual-triggered and optically monitored drug delivery, which will facilitate the rational design of personalized cancer therapy.

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“…Because of the uniform pore channel, large mesopore size, high pore volume and good chemical inertness, ordered mesoporous carbons (OMCs) have already demonstrated promising performance in a number of applications such as catalysis, separation, fuel cells and supercapacitors12345. The wide and ordered pore channels are especially useful for the separation of large biomolecules or natural products and, at the same time, provide broad space for fast mass transfer, which is highly beneficial in high-rate supercapacitors and heterogeneous catalysis678.…”

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Solid-state synthesis of ordered mesoporous carbon catalysts via a mechanochemical assembly through coordination cross-linking

et al. 2017

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Ordered mesoporous carbons (OMCs) have demonstrated great potential in catalysis, and as supercapacitors and adsorbents. Since the introduction of the organic–organic self-assembly approach in 2004/2005 until now, the direct synthesis of OMCs is still limited to the wet processing of phenol-formaldehyde polycondensation, which involves soluble toxic precursors, and acid or alkali catalysts, and requires multiple synthesis steps, thus restricting the widespread application of OMCs. Herein, we report a simple, general, scalable and sustainable solid-state synthesis of OMCs and nickel OMCs with uniform and tunable mesopores (∼4–10 nm), large pore volumes (up to 0.96 cm3 g−1) and high-surface areas exceeding 1,000 m2 g−1, based on a mechanochemical assembly between polyphenol-metal complexes and triblock co-polymers. Nickel nanoparticles (∼5.40 nm) confined in the cylindrical nanochannels show great thermal stability at 600 °C. Moreover, the nickel OMCs offer exceptional activity in the hydrogenation of bulky molecules (∼2 nm).

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Incorporation of well-dispersed sub-5-nm graphitic pencil nanodots into ordered mesoporous frameworks

Cited by 157 publications

References 39 publications

Mesoporous materials for energy conversion and storage devices

Mesoporous materials for energy conversion and storage devices

A Multifunctional Nanocrystalline CaF₂:Tm,Yb@mSiO₂ System for Dual‐Triggered and Optically Monitored Doxorubicin Delivery

Solid-state synthesis of ordered mesoporous carbon catalysts via a mechanochemical assembly through coordination cross-linking

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Incorporation of well-dispersed sub-5-nm graphitic pencil nanodots into ordered mesoporous frameworks

Cited by 157 publications

References 39 publications

Mesoporous materials for energy conversion and storage devices

Mesoporous materials for energy conversion and storage devices

A Multifunctional Nanocrystalline CaF2:Tm,Yb@mSiO2 System for Dual‐Triggered and Optically Monitored Doxorubicin Delivery

Solid-state synthesis of ordered mesoporous carbon catalysts via a mechanochemical assembly through coordination cross-linking

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A Multifunctional Nanocrystalline CaF₂:Tm,Yb@mSiO₂ System for Dual‐Triggered and Optically Monitored Doxorubicin Delivery