RSC主编推荐：材料领域精彩文章快览（免费阅读原文）

英国皇家化学会（RSC）是一个超过175年历史的面向全球化学家的非营利会员制机构，旗下拥有44种期刊，其中很多在化学领域有很高影响力。为了进一步帮助广大读者追踪科技前沿热点，X-MOL团队与英国皇家化学会合作，推出英国皇家化学会期刊主编推荐的精彩文章快览，本期文章属“材料领域”，英文点评来自英国皇家化学会期刊的主编。如果大家对我们的解读有更多的补充和点评，欢迎在文末写评论发表您的高见！

Chemical Science (IF: 9.556)

1. Ambient aqueous-phase synthesis of covalent organic frameworks for degradation of organic pollutants

Chem. Sci., 2019, Advance Article

DOI: 10.1039/C9SC03725J

Researchers in China have looked into the developed of a mild, low cost and green synthetic route for the preparation of covalent organic frameworks (COFs). Here the authors report a general and facile strategy to prepare a series of microporous or mesoporous COFs by a β-ketoenamine based Michael addition–elimination reaction in aqueous systems at ambient temperature and pressure. This synthesis method not only produces highly crystalline and porous COFs, but also can be carried out with a high reaction rate (only 30 min), high yields (as high as 93%) and large-scale preparation (up to 5.0 g). This work provides a promising pathway to large-scale green preparation of COFs and their potential application in environmental remediation.

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2. Near-infrared light-responsive hydrogels via peroxide-decorated MXene-initiated polymerization

Chem. Sci., 2019, Advance Article

DOI: 10.1039/C9SC03917A

The authors report the preparation of two-dimensional MXene Ti₃C₂T_xnanosheets with peroxide decoration (p-Ti₃C₂T_x) via a sonication-assisted MILD etching method. The obtained MXenes can generate hydroxyl radical species and act as an initiator for free-radical polymerization of a series of acrylic monomers without the use of light illumination or co-initiators. The nanocomposite hydrogels have a photothermal conversion efficiency of 34.7% and photothermal stability superior to that of pristine Ti₃C₂T_x. The nanocomposite hydrogels are successfully exploited as remotely near-infrared light controlled “smart” windows, fluidic valves and photodetectors.

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Biomaterials Science (IF: 5.251)

1. A forskolin-conjugated insulin analog targeting endogenous glucose-transporter for glucose-responsive insulin delivery

Biomater. Sci., 2019, 7, 4508-4513

DOI: 10.1039/C9BM01283D

Authors conjugated insulin and forskolin (a glucose transporter inhibitor) to create an insulin analog named insulin-F. In vitro testing showed it was reversibly binding to glucose transporters and the binding kinetics were studied. The authors demonstrated that insulin-F could  be used to maintain normal blood glucose levels (BGLs) for more than 10 hours after the injection in vivo in diabetic mice. With a second injection 3 hours after the initial injection BGLs were maintained for 20 hours in total. The authors carried out a four-week study giving regular injections of insulin-F to successfully maintain BGLs in the diabetic mice.

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Polymer Chemistry (IF: 4.760)

1. Recyclable sulfone-containing polymers via ring-opening polymerization of macroheterocyclic siloxane monomers: synthesis, properties and recyclability

Polym. Chem., 2019, Advance Article

DOI: 10.1039/C9PY01363F

The authors describe the synthesis and properties of new recyclable sulfone-containing polysiloxanes with a molecular weight up to 49 kg mol^-1. The polymers exhibited good thermal stability and polysiloxane nanofibers were successfully obtained via electrospinning. The polymer synthesis was carried out via the anionic ring-opening polymerization (ROP) of a macrocyclic siloxane monomer and the depolymerisation was carried out under mild conditions at room temperature, and with a high selectivity. The authors carried out computational studies and have proposed a reaction mechanism of the closed-loop recycling of the polymer.

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Materials Horizons (IF: 14.356)

1. A monomer-assembly template-directed synthesis of conjugated porous polymer microtubular bundles

Mater. Horiz., 2019, Advance Article

DOI:10.1039/C9MH01381D

Porous organic materials (POMs) hold promising applications in catalysis, energy conversion and storage due to their substantial porous structures and finely tunable properties on the basis of the highly designable building blocks and linking modes. The defined morphology of the POMs in micrometer or larger scale plays an extremely important role in fully releasing their molecular-level properties in the bulk phase. However, the synthesis strategy for POMs with well-controlled morphologies is still very limited and full of challenges. In this study, we develop a monomer-assembly template-directed strategy to synthesize the conjugated porous polymer microtubular bundles via the dynamic covalent acylhydrazon linkage. Such kind of a formation process of the microtubular bundles is similar to the Kirkendall effect for inorganic hollow structures. As far as we know, there is no document regarding Kirkendall effect on the formation of hollow structures in organic molecules. The conjugated porous polymer featuring smooth microtubular bundles can be essentially constructed. Such defined morphology exhibits the substantial co-used tubular walls and orientated channels with sub-micrometre-sized diameters and lengths in tens of micrometers, thus rendering extremely high accessibility of their redox active sites. This study not only provides a concise method to construct conjugated porous polymer bundles with well-defined morphologies in the micrometre scale but also provides highly efficient electrochemical performance arising from such hierarchical morphology, which will promote the development of porous organic materials with more complex structures for applications in energy conversion and storage.

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2. Highly stable and spectrum-selective ultraviolet photodetectors based on lead-free copper-based perovskites

Mater. Horiz., 2019, Advance Article

DOI: 10.1039/C9MH01371G

An intrinsically large light absorption coefficient, and high and well-balanced carrier transport ability endow metal-halide perovskites with great promise for high-performance photodetectors. However, compared to the intensive efforts on broadband photodetectors, narrowband photodetectors based on perovskites, especially targeting the ultraviolet (UV) region, have not been reported. Here, for the first time solution-processed lead-free Cs₃Cu₂I₅ films were used as the light absorber to fabricate spectrum-selective UV photodetectors by using the charge collection narrowing concept, overcoming the shortcomings of conventional strategies for making narrowband photodetectors (high cost, complex configuration, and difficult integration), and a narrow response “window” of 300–370 nm was achieved. Unlike traditional perovskites, lead-free Cs₃Cu₂I₅ is very stable against heat, UV light, and environmental oxygen/moisture. Typically, the unencapsulated device can endure a high working temperature (373 K) for 12 h continuous operation in ambient air. Further, UV imaging applications were demonstrated by deploying the photodetectors as sensing pixels. The results suggest that lead-free Cs₃Cu₂I₅ is potentially an attractive candidate for stable and narrowband UV photodetectors, rendering it potentially useful for the assembly of optoelectronic systems in the future.

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3. High-κ polymers of intrinsic microporosity: a new class of high temperature and low loss dielectrics for printed electronics

Mater. Horiz., 2019, Advance Article

DOI: 10.1039/C9MH01261C

In this work, a new concept of a friction-free dipolar glass polymer is demonstrated using novel sulfonylated polymers of intrinsic microporosity (SO₂-PIMs). First, the nanopores in PIMs provide large free volume for friction-free rotation of side-chain dipolar groups. Second, the sulfonyl group has a large dipole moment of 4.5 D to promote orientational polarization. Third, the rigid, contorted, ladder-like backbone of PIM enables a high glass transition temperature (T_g, above the thermal degradation temperature). As a result of friction-free rotation of sulfonyl dipoles in the nanopores below the T_g, SO₂-PIM shows a dissipation factor as low as 0.005, while achieving a high dielectric constant (κ = 6) and a high discharged energy density of 17 J cm^-3 with discharge efficiency >90% at room temperature. Even at 175 °C, the discharge efficiency maintained at 86%, indicating excellent heat tolerance. Compared to existing high κ dipolar polymers, this concept has never been demonstrated before. Furthermore, the dielectric performance of SO₂-PIM is tested in the InSe field-effect transistors (FETs). Intriguingly, the high κ SO₂-PIM significantly promotes the electron mobility in InSe to 200–400 cm² V^-1 s^-1. This work demonstrates that SO₂-PIMs are promising as next generation gate dielectric materials for printed electronics.

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