Nature Communications
·
2023
·Vol. 14
·期 1
·1-12
·
IF 16.6
Xiong Xueru,Chen Yunhua,Wang Zhenxing,Liu Huan,Le Mengqi,Lin Caihong,Wu Gang,Wang Lin,Shi Xuetao,Jia Yong-Guang,Zhao Yanli
While hydrogels enable a variety of applications in wearable sensors and electronic skins, they are susceptible to fatigue fracture during cyclic deformations owing to their inefficient fatigue resistance. Herein, acrylated β-cyclodextrin with bile acid is self-assembled into a polymerizable pseudorotaxane via precise host-guest recognition, which is photopolymerized with acrylamide to obtain conductive polymerizable rotaxane hydrogels (PR-Gel). The topological networks of PR-Gel enable all desirable properties in this system due to the large conformational freedom of the mobile junctions, including the excellent stretchability along with superior fatigue resistance. PR-Gel based strain sensor can sensitively detect and distinguish large body motions and subtle muscle movements. The three-dimensional printing fabricated sensors of PR-Gel exhibit high resolution and altitude complexity, and real-time human electrocardiogram signals are detected with high repeating stability. PR-Gel can self-heal in air, and has highly repeatable adhesion to human skin, demonstrating its great potential in wearable sensors.
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JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 12
·5552-5568
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IF 4.5
Gao Zheng,Huang Chao,Tang Ruizhi,Ma Shujuan,Gong Bolin,Ou Junjie
Asymmetric particles (Janus particles) with discrete surface regions owning different chemical compositions or physical shapes have attracted increasing attention in the last two decades. Exploring novel strategies for synthesis of Janus particles is a great challenge due to somewhat complicated process and taking long time. In this work, several micron-scale Janus particles were rapidly prepared by photo-initiated seeded swelling polymerization for the first time, using glycyl methacrylate (GMA) as monomer and pentaerythritol tetraacrylate (PET4A) as crosslinker. After swelling of the seeds, the polymerization could be completed with ultraviolet light of 365 nm for 15 min. The effects of seed amount, molar ratio of monomer to crosslinker, volume ratio and type of porogenic agent and illumination time on Janus particle morphology were systematically investigated, and the resulting Janus particles with semi-raspberry-like morphology could be adjusted. Additionally, Janus particles were modified with a layer of polymer brush by surface-initiated atom transfer radical polymerization. The as-synthesized Janus@poly(GMA)-EDA was utilized for the adsorption of Cu(II) ion, and the adsorption capacity reached 349.6 mg g −1 , indicating that Janus@poly(GMA)-EDA exhibited great application potential for heavy metal removal. Graphical abstract
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Science China-Materials
·
2023
·Vol. 66
·期 6
·2483-2491
·
IF 8.1
Wang Junjun,Zhu Yicai,Li Jinsong,Wang Aidong,Yu Zhipeng,Wang Sen,Zhou Hongping
The design of metal-free nano-photosensitizers (nano-PSs) with high-order multi-photon activity for second near-infrared (NIR-II, 1000–1700 nm) light-induced photodynamic therapy (PDT) has always been an intractable challenge. In this study, a high-order multiphoton activity was successfully initiated in a facile process by the supramolecular assembly of bovine serum albumin (BSA) with a series of metal-free PSs (named as TPA- n Cs ( n = 2, 3, 4, 5, 6, and 7)), and an interesting structure-function relationship was revealed by the “odd-even” effect. Specifically, the prepared protein nano-assembly TPA- n Cs@BSA initiated a zig-zag enhanced three-photon performance due to the huge differences in dipole moments between “odd” and “even” alkyl substituents of TPA- n Cs. Among them, TPA-7C@BSA has the largest three-photon absorption cross section up to 4.81 × 10 −81 cm 6 s 2 photon −2 , which could delicately execute effective NIR-II PDT towards H22-tumor by the reactive oxygen species generated upon the irradiation of laser (1250 nm). The “odd-even” regulation of alkyl chains provided a new idea for developing and improving multi-photon photosensitized metal-free materials for biomedical applications.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 19
·55200-55213
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IF 5.8
Feng Huimiao,Zhou Ping,Liu Feixue,Zhang Wei,Yang Haitao,Li Xueqing,Dong Jingquan
Abamectin is a commonly used pesticide in agriculture and fisheries and poses a risk to aquatic species. However, the mechanism of its toxic effects on fish remains to be discovered. In this study, we explored the effects of abamectin exposure at different concentrations on the respiratory system of carp. Carp were divided into three groups, namely the control group, low-dose abamectin treatment group, and high-dose abamectin treatment group. Gill tissue was collected after abamectin exposure for histopathological, biochemical, tunnel, mRNA, and protein expression analysis. Histopathological analysis indicated that abamectin damaged the gill structure. Biochemical analysis showed that abamectin triggered oxidative stress with lowered antioxidant enzyme activities and increased MDA content. Moreover, abamectin led to enhanced INOS levels and pro-inflammatory transcription, activating inflammation. Tunnel results demonstrated that exposure to abamectin induced gill cell apoptosis through an exogenous pathway. In addition, exposure to abamectin activated the PI3K/AKT/mTOR pathway, leading to inhibition of autophagy. Overall, abamectin caused respiratory system toxicity in carp via triggering oxidative stress, inflammation, and apoptosis and inhibiting autophagy. The study suggests that abamectin has a profound toxicity mechanism in the respiratory system of carp, contributing to a better understanding of pesticide risk assessment in aquatic systems.
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npj Regenerative Medicine
·
2023
·Vol. 8
·期 1
·1-21
·
IF 7.2
Wen Bo,Dai Yuguo,Han Xue,Huo Fangjun,Xie Li,Yu Mei,Wang Yuru,An Ning,Li Zhonghan,Guo Weihua
Maxillofacial hard tissue defects caused by trauma or infection often affect craniofacial function. Taking the natural hard tissue structure as a template, constructing an engineered tissue repair module is an important scheme to realize the functional regeneration and repair of maxillofacial hard tissue. Here, inspired by the biomineralization process, we constructed a composite mineral matrix hydrogel PAA-CMC-TDM containing amorphous calcium phosphates (ACPs), polyacrylic acid (PAA), carboxymethyl chitosan (CMC) and dentin matrix (TDM). The dynamic network composed of Ca 2+ ·COO − coordination and ACPs made the hydrogel loaded with TDM, and exhibited self-repairing ability and injectability. The mechanical properties of PAA-CMC-TDM can be regulated, but the functional activity of TDM remains unaffected. Cytological studies and animal models of hard tissue defects show that the hydrogel can promote the odontogenesis or osteogenic differentiation of mesenchymal stem cells, adapt to irregular hard tissue defects, and promote in situ regeneration of defective tooth and bone tissues. In summary, this paper shows that the injectable TDM hydrogel based on biomimetic mineralization theory can induce hard tissue formation and promote dentin/bone regeneration.
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CATALYSIS LETTERS
·
2023
·
IF 2.8
Xu Lingling,Pan Xiaomei,Wu Ningxin,Gao Lijing,Xiao Guomin
The conversion of biomass energy sources is a crucial direction in the transformation of energy resources, such as cellulose to high-value chemicals. As an important platform compound, 5-hydroxymethylfurfural (HMF) is one of the worthwhile products from biomass. Previously, the use of Hf/ZSM-5 catalyst demonstrated excellent catalytic performance, with the yield of HMF reaching 67.50% under optimal reaction conditions (120 min, 190 °C, H 2 O(NaCl)/THF). Based on the previous work, the effect of a series of metal salts on the preparation of HMF from cellulose catalyzed by Hf/ZSM-5 catalyst was investigated in this paper. This result demonstrates the addition of AlCl 3 promoted the production of HMF yield and AlCl 3 completed with excellent performance among five metal salts. Moreover, the yield of HMF was improved to 70.95% by adjusting the optimal reaction conditions. Graphical Abstract
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-11
·
IF 16.6
Chen Huai,Xiong Yangyang,Li Jun,Abed Jehad,Wang Da,Pedrazo-Tardajos Adrián,Cao Yueping,Zhang Yiting,Wang Ying,Shakouri Mohsen,Xiao Qunfeng,Hu Yongfeng,Bals Sara,Sargent Edward H.,Su Cheng-Yong,Yang Zhenyu
Improving the dispersion of active sites simultaneous with the efficient harvest of photons is a key priority for photocatalysis. Crystalline silicon is abundant on Earth and has a suitable bandgap. However, silicon-based photocatalysts combined with metal elements has proved challenging due to silicon’s rigid crystal structure and high formation energy. Here we report a solid-state chemistry that produces crystalline silicon with well-dispersed Co atoms. Isolated Co sites in silicon are obtained through the in-situ formation of CoSi 2 intermediate nanodomains that function as seeds, leading to the production of Co-incorporating silicon nanocrystals at the CoSi 2 /Si epitaxial interface. As a result, cobalt-on-silicon single-atom catalysts achieve an external quantum efficiency of 10% for CO 2 -to-syngas conversion, with CO and H 2 yields of 4.7 mol g (Co) −1 and 4.4 mol g (Co) −1 , respectively. Moreover, the H 2 /CO ratio is tunable between 0.8 and 2. This photocatalyst also achieves a corresponding turnover number of 2 × 10 4 for visible-light-driven CO 2 reduction over 6 h, which is over ten times higher than previously reported single-atom photocatalysts.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2023
·Vol. 27
·期 5
·1269-1278
·
IF 2.5
Li Minzhang,Xu Junyuan,Qi Fei,Wang Yu,Yan Chunliu,Xu Jiaju
A tetrafluoro substituted CoPc (CoF 4 Pc), which is well dispersed in N,N-dimethylformamide (DMF), was used to modify carbon nanotubes (CNTs) via a facile sonication method, resulting in CoF 4 Pc nanorods with the length lower than 30 nm on the CNT surface. The as-fabricated CoF 4 Pc-CNT composites showed superior CO 2 RR catalytic activity compared with that of individual CoF 4 Pc, due to enhanced mass transfer and electrical conductivity arising from the CNT substrate. The CoF 4 Pc-CNT composite with the CoF 4 Pc/CNT weight ratio of 2:30 exhibited the highest CO current density of 29.0 mA cm −2 and CO selectivity of 91.8% at − 0.85 V vs. reversible hydrogen electrode (RHE) in a flow cell setup containing 0.5 M KHCO 3 , which was ascribed to enhanced charge transfer induced by highly dispersion of CoF 4 Pc nanorods, and good conductivity of CNT substrates. The work provides new insights for developing low-cost, effective, phthalocyanine-based catalysts for electrochemical CO 2 RR.
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ANALYTICAL SCIENCES
·
2023
·Vol. 39
·期 7
·1097-1106
·
IF 1.6
Xie Wenfei,Liu Jinrui,Qu Yunting,Du Fangkai
In this work, a convenient ratiometric fluorescent platform was designed to measure organophosphorus pesticides (OPs) based on acetylcholinesterase (AChE), acetylthiocholine (ATCh), manganese dioxide nanosheets (MnO 2 ), near-infrared carbon dots (RCDs) and o-phenylenediamine (OPD). In this platform, a direct oxidation of OPD by MnO 2 generated the luminescent product 2,3-diaminophenolazine (DAP) through intrinsic oxidase activity, while RCDs served as a fluorescent reference indicator. In the presence of AChE and ATCh, the enzymatic hydrolysate thiocholine (TCh) would reduce MnO 2 nanosheets to Mn 2+ , leading to the quenching of DAP fluorescence. On the other hand, OPs can inhibit the catabolism of ATCh by AChE thus acting as a recognizer of OPs. According to these reactions, OPs were quantitatively analyzed by the intensity ratio of fluorescence emitted from RCDs and DAP ( F 560 / F 676 ). The constructed platform can detect OPs with the range of 0.2–0.6 μM with a detection limit of 4.3 nM. Graphical abstract Figure A ratiometric fluorescent probe based on carbon dots was obtained and using it to determine the concentration of organophosphorus pesticides
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 19
·54846-54856
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IF 5.8
Wang Kai,Liang Yaping,Duan Manman,Che Wunan,He Lu
Broflanilide is a novel pesticide used in agriculture that binds to unique receptors on pests; however, the widespread use of broflanilide has led to toxicity in Daphnia magna . At present, little information on the potential threats broflanilide imposes on D. magna is available. Therefore, the present study examined the chronic toxicity of broflanilide in D. magna by comparing changes in molting, neurotransmitter function, and behavior. The results showed that broflanilide caused chronic toxicity in D. magna at a concentration of 8.45 μg/L, and growth, development, reproduction, and the development of offspring were affected. In addition, broflanilide affected the molting of D. magna by significantly inhibiting the expression of chitinase, ecdysteroid, and related genes. Broflanilide also affected the expression of γ-glutamic acid, glutamine, gamma-aminobutyric acid, 5-hydroxytryptamine, 5-hydroxytryptophan, dopa, and dopamine. Furthermore, the swimming distance and speed of D. magna were reduced . Taken together, the results demonstrate the chronic toxicity and exposure risk of broflanilide in D. magna .
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 8
·1-12
·
IF 2.8
Yan Xin,Xie Ming,Pan Liangfeng,Ai Tao,Li Zhuo,Niu Yanhui
The recombination of charge carriers in photocatalysts is one of the main factors restricting photocatalytic performance. In this paper, the NaNbO 3 /g-C 3 N 4 heterojunction photocatalyst was prepared by a simple ultrasonic mixing approach and applied to obtain superior piezo-photocatalytic activity. The results showed that the NaNbO 3 nanowires were attached to the g-C 3 N 4 surface for efficient degradation of rhodamine B (RhB). Through the synergistic action of visible-light irradiation and ultrasonic vibration, the RhB solution could be degraded within 30 min by 5% NaNbO 3 /g-C 3 N 4 heterojunction. The reaction rate constant ( k ) of 5% NaNbO 3 /g-C 3 N 4 heterojunction is 2.7 times that of pure g-C 3 N 4 . Moreover, quenching tests and electronic spin resonance (ESR) indicated that ·O 2 − was the primary active species for RhB degradation. The enhanced photocatalytic performance was attributed to the formation of the heterojunction at the NaNbO 3 /g-C 3 N 4 interface. Furthermore, the piezoelectric field that originated from the bending deformation of NaNbO 3 nanowires effectively promoted charge carriers separation efficiency in the NaNbO 3 /g-C 3 N 4 heterojunction.
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Nano Research
·
2023
·Vol. 16
·期 5
·6670-6678
·
IF 9.9
Jing Tianyun,Yang Shaokang,Feng Yonghai,Li Tingting,Zuo Yunpeng,Rao Dewei
Co-based catalysts are promising alternatives to precious metals for the selective and effective oxidation of 5-hydroxymethylfurfural (HMF) to the higher value-added 2,5-furandicarboxylic acid (FDCA). However, these catalysts still suffer from unsatisfactory activity and poor selectivity. A series of N-doped carbon-supported Co-based dual-metal nanoparticles (NPs) have been designed, among which the Co-Cu 1.4 -CN x exhibits enhanced HMF oxidative activity, achieving FDCA formation rates 4 times higher than that of pristine Co-CN x , with 100% FDCA selectivity. Density functional theory (DFT) calculations evidenced that the increased electron density on Co sites induced by Cu can mediate the positive electronegativity offset to downshift the d-band center of Co-Cu 1.4 -CN x , thus reducing the energy barriers for the conversion of HMF to FDCA. Such findings will support the development of superior non-precious metal catalysts for HMF oxidation.
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