JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 4
·1-8
·
IF 2.8
Li Dongxiang,Qian Xing,Huang Rui,Li Chunfang
Thermo-responsive poly( N -isopropylacrylamide) with terminal azobenzene group (PNIPAM-Azo) can show distinct property changes in response to temperature and light. In this paper, azobenzene-terminated trithiocarbonate (DDMAT-Azo) was synthesized as chain transfer agent, with which PNIPAM-Azo was prepared by reversible addition-fragmentation transfer (RAFT) polymerization of NIPAM in 1, 4-dioxane at 80 °C under N 2 atmosphere, azodiisobutyronitrile as initiator. The structure of DDMAT-Azo was characterized by nuclear magnetic resonance (NMR) and fourier transform infrared spectra, and PNIPAM-Azo was characterized by NMR spectra and Gel Permeation Chromatography (GPC). The result from GPC showed the numerical average molecular weight of PNIPAM-Azo was 3870 and its molecular weight distribution index was 1.31. Furthermore, thermo- and light-responsive hydrogel was obtained by introducing PNIPAM-Azo. Both PNIPAM-Azo and the hydrogel showed good light sensitivity and thermo sensitivity. Such double-stimuli sensitive hydrogel will be applied in biomaterials such as sensor, drug controlled release, information storage etc.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2023
·Vol. 415
·期 14
·2705-2713
·
IF 4.3
Hua Fei,Pan Fenglan,Yang Juanhua,Yan Yongkang,Huang Xueer,Yuan Yali,Nie Jinfang,Wang Hua,Zhang Yun
This work describes two new colorimetric nanosensors for label-free, equipment-free quantitative detection of nanomolar copper (II) (Cu 2+ ) and mercury (II) (Hg 2+ ) ions. Both are based on the analyte-promoted growth of Au nanoparticles (AuNPs) from the reduction of chloroauric acid by 4-morpholineethanesulfonic acid. For the Cu 2+ nanosensor, the analyte can accelerate such a redox system to rapidly form a red solution containing dispersed, uniform, spherical AuNPs that is related to these particles’ surface plasmon resonance property. For the Hg 2+ nanosensor, on the other hand, a blue mixture consisting of aggregated, ill-defined AuNPs with various sizes can be created, showing a significantly enhanced Tyndall effect (TE) signal (in comparison with that produced in the red solution of AuNPs). By using a timer and a smartphone to quantitatively measure the time of producing the red solution and the TE intensity (i.e., the average gray value of the corresponding image) of the blue mixture, respectively, the developed nanosensors are well demonstrated to achieve linear ranges of 6.4 nM to 100 μM and 6.1 nM to 1.56 μM for Cu 2+ and Hg 2+ , respectively, with detection limits down to 3.5 and 0.1 nM, respectively. The acceptable recovery results obtained from the analysis of the two analytes in the complex real water samples including drinking water, tap water, and pond water ranged from 90.43 to 111.56%. Graphical abstract
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MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 5
·1-9
·
IF 5.7
Jiang Guo-yong,Liu Lin,Wan Yu-qi,Li Jing-kun,Pi Fu-wei
Molecularly imprinted polymers (MIPs) were combined with surface-enhanced Raman scattering (SERS) and AgNPs were prepared by in situ reduction within the MIP for selective and sensitive detection of sulfamethazine (SMZ). The MIP@AgNPs composites were characterized in detail by several analytical techniques, showing the generation of polymers and the formation of AgNPs hot spots. The specific affinity and rapid adsorption equilibrium rates of MIP@AgNPs composites were verified by static and kinetic adsorption studies. The MIP@AgNPs with high selectivity and excellent sensitivity were used as SERS substrates to detect SMZ. A good linear correlation (R 2 = 0.996) in rang of 10 –10 -10 –6 mol L -1 was observed between the Raman signal (1596 cm −1 ) and the concentration of SMZ. The limit of detection (LOD) was as low as 8.10 × 10 –11 mol L -1 with relative standard deviations (RSD) of 6.32%. The good stability and reproducibility are also fully reflected in the SERS detection based on MIP@AgNPs. The method was successfully applied to the analysis of lake water samples, with recoveries in the range 85.1% to 102.5%. In summary, SERS detection based on MIP@AgNPs can be developed for a wider and broader range of practical applications. Graphical Abstract
Schematic illustration of MIP@AgNPs sensor for the SERS detection of sulfamethazine
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JOURNAL OF NANOBIOTECHNOLOGY
·
2023
·Vol. 21
·期 1
·1-18
·
IF 10.2
Yu Hao,Teng Yun,Ge Jun,Yang Ming,Xie Haifeng,Wu Tianyi,Yan Qi,Jia Mengting,Zhu Qing,Shen Yanping,Zhang Lianxue,Zou Jun
Excessive reactive oxygen species (ROS) in nucleus pulposus cells (NPCs) promote extracellular matrix (ECM) degradation and cellular inflammatory responses by activating a variety of cellular pathways, ultimately inducing cell apoptosis and leading to the development of low back pain. Here, we designed and fabricated an isoginkgetin-loaded ROS-responsive delivery system (IGK@SeNP) based on diselenide block copolymers. Successfully encapsulated IGK was released intelligently and rapidly in a microenvironment with high ROS levels in degenerative disc. Controlled-release IGK not only efficiently scavenged ROS from the intervertebral disc together with diselenide block copolymers but also effectively enhanced autophagy in NPCs to inhibit ECM degradation and cell apoptosis, and showed significant therapeutic effects in the rat intervertebral disc degeneration (IDD) model. Overall, the synergistic effects of IGK@SeNP in ROS scavenging and autophagy enhancement endowed it with an attractive therapeutic strategy for IDD treatment.
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-12
·
IF 16.6
Sheng Huixiang,Wang Jin,Huang Juhui,Li Zhuoyao,Ren Guozhang,Zhang Linrong,Yu Liuyingzi,Zhao Mengshuai,Li Xuehui,Li Gongqiang,Wang Ning,Shen Chen,Lu Gang
The reaction efficiency of reactants near plasmonic nanostructures can be enhanced significantly because of plasmonic effects. Herein, we propose that the catalytic activity of molecular catalysts near plasmonic nanostructures may also be enhanced dramatically. Based on this proposal, we develop a highly efficient and stable photocatalytic system for the hydrogen evolution reaction (HER) by compositing a molecular catalyst of cobalt porphyrin together with plasmonic gold nanoparticles, around which plasmonic effects of localized electromagnetic field, local heating, and enhanced hot carrier excitation exist. After optimization, the HER rate and turn-over frequency (TOF) reach 3.21 mol g −1 h −1 and 4650 h −1 , respectively. In addition, the catalytic system remains stable after 45-hour catalytic cycles, and the system is catalytically stable after being illuminated for two weeks. The enhanced reaction efficiency is attributed to the excitation of localized surface plasmon resonance, particularly plasmon-generated hot carriers. These findings may pave a new and convenient way for developing plasmon-based photocatalysts with high efficiency and stability.
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Nano Research
·
2023
·Vol. 16
·期 7
·8757-8764
·
IF 9.9
Liang Zhong,Song Lianpeng,Sun Mingzi,Huang Bolong,Du Yaping
Currently, single-atom combo catalysts (SACCs) for carbon dioxide reduction reaction (CO 2 RR) to the formation of HCOOH are still very limited, especially the lanthanide-based SACCs. In this work, the novel SACCs with atomically dispersed In and Ce active sites were successfully prepared on the nitrogen-doped carbon matrix (InCe/CN). Both aberration-corrected high-angle annular dark-field scanning transmission electron microscopy (AC-HAADF-STEM) images and the extended X-ray absorption fine structure (EXAFS) spectra proved the well-isolated In and Ce atoms. The as-prepared InCe/CN shows a high Faradaic efficiency (FE) (77%) and current density of HCOOH formation ( j HCOOH ) at −1.35 V vs. reversible hydrogen electrode (RHE), much higher than the single atom catalysts. Theoretical calculations have indicated that the introduced Ce single atom sites not only significantly promote electron transfer but also optimize the In-5p orbitals towards higher selectivity towards the HCOOH formation. This work innovatively extends the design of SACCs towards the main group and Ln metals for more applications.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 7
·1-19
·
IF 2.8
Zhu Yong,Wu Yu-Rong,Xu Long-Shan,Ma Li-Li,Jiang Yang-Ying
Photocatalysis is considered as a promising method to control water pollution caused by organic and biological pollutants. However, this technology faces some challenges, especially the easy recombination of photogenerated electron hole pairs. The construction of p–n heterojunction is a feasible way to expand the light absorption range and inhibit charge carrier recombination to improve the photocatalytic performance. But p–n heterojunction is at the expense of semiconductor redox ability to some extent. So it is necessary to build a new model to solve the above problems. Herein, an emerging Z-scheme photocatalyst composed of ZnO single crystal nanorods (SCNRs) assisted Cu 2 O ultrafine nanoparticles (Cu 2 O-UNPs) is successfully synthesized using a hydrothermal method in conjunction with a chemical reduction. The two parts of this heterostructure are chemically bonded one another to form a tight interface. The specific surface area of Cu 2 O/ZnO is 28.6 time than that of pure ZnO. The Cu 2 O/ZnO exhibited excellent photocatalytic activity and stability on simultaneous organic dye degradation due to the high redox ability. The addition of Cu 2 O can inhibit the photogenerated electron–hole pair recombination, facilitate an effective interface charge transfer, and increase the activity of photocatalysis. Under UV–visible light, this heterojunction displayed impressive ability to degrade for anionic and cationic organic dyes. ⋅OH active species play a major role in the photocatalytic process. Therefore, based on the relevant characterization results, a reasonable photocatalytic mechanism based on Z-scheme heterostructure was established. Moreover, this novel Cu 2 O-UNPs/ZnO SCNRs Z-scheme heterojunction also presents an extraordinary chance for use in waste disposal and purification.
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JOURNAL OF ELECTRONIC MATERIALS
·
2023
·Vol. 52
·期 5
·3173-3179
·
IF 2.1
Han Ruiyi,Chen Jin,Wang Fengchao,Sun Yu,Hu Yanling,Yang Jing,Zhang Canyun,Kong Jinfang,Li Lan,Wang Haiyan
In this work, a facile solution based on the supersaturated crystallization principle combined with an ion exchange strategy was employed for the preparation of all-inorganic lead halide perovskite CsPbX 3 quantum dots (X = Cl, Br, I, and their combinations) under an ambient atmosphere. As the results showed, with the progression of Br–Cl and Br–I ion exchange, the green emission of pure CsPbBr 3 gradually turned to cyan and blue, yellow, and red, respectively. Thus, the emission featured a broad wavelength range from 472 nm to 638 nm. With regard to the morphology, the as-synthesized quantum dots were all spherical and monodisperse, and the crystal size increased from the blue to the red samples. Furthermore, the chemical composition investigated by energy-dispersive x-ray spectroscopy (EDS) and x-ray photoelectron spectroscopy (XPS) confirmed the successful Br–Cl or Br–I ion exchange, and the obtained samples were expressed as CsPbBr 1.9 Cl 1.1 , CsPbBr 2.1 Cl 0.9 , CsPbBr 3 , CsPbBr 1.7 I 1.3 , and CsPbBr 0.9 I 2.1 for blue, cyan, green, yellow, and red samples, respectively. In future work, the as-synthesized samples will be investigated for use in an optoelectronic device application.
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Cell Death Discovery
·
2023
·Vol. 9
·期 1
·1-11
·
IF 7
Yang Liu,Du Xing,Wang Siqi,Lin Chenggang,Li Qiqi,Li Qifa
Follicular atresia triggered by granulosa cell (GC) apoptosis severely reduces female fertility and accelerates reproductive aging. GC apoptosis is a complex process regulated by multiple factors, regulatory axes, and signaling pathways. Here, we report a novel, small regulatory network involved in GC apoptosis and follicular atresia. miR-187, a miRNA down-regulated during follicular atresia in sows, maintains TGFBR2 mRNA stability in sow GCs by directly binding to its 5’-UTR. miR-187 activates the transforming growth factor-β (TGF-β) signaling pathway and suppresses GC apoptosis via TGFBR2 activation. NORHA, a pro-apoptotic lncRNA expressed in sow GCs, inhibits TGFBR2-mediated activation of the TGF-β signaling pathway by sponging miR-187. In contrast, NORFA, a functional lncRNA associated with sow follicular atresia and GC apoptosis, enhances miR-187 and TGFBR2 expression by inhibiting NORHA and activating NFIX. Our findings define a simple regulatory network that controls GC apoptosis and follicular atresia, providing new insights into the mechanisms of GC apoptosis, follicular atresia, and female fertility.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2023
·Vol. 39
·期 1
·133-138
·
IF 3.1
Chen Bingda,Zhang Zelong,Su Meng,Qin Feifei,Pan Qi,Xie Daixi,Yang Xu,Zhang Kun,Zhang Zeying,Xie Hongfei,Carmeliet Jan,Song Yanlin
T raditional synthesis strategy of nanomaterials with complicated process and high cost limits their applications. Here, we propose a facile process for the synchronous synthesis and patterning of silver nanoparticles(Ag NPs) through the self-driven microchannel reactor with the capillary effect inspired by transpiration. The evaporation contributes to capillary and accumulation effects in the microchannels. The silver reactant-containing droplets can be spontaneously divided and distributed in multiple microchannels during the whole fabrication process by the capillary effect. The newly formed Ag NPs at the gas-liquid interface can be assembled on both sides of the microchannels by the accumulation effect. The capillary effect decreases the disturbances, which ensures the uniformity of the patterning. By the combination of microchannels with different widths, various Ag NPs-assembled patterns with stable electrical properties are achieved. This efficient strategy with a simple fabrication procedure is towards the technological engineering of nanoscale architected materials.
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JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 4
·1694-1707
·
IF 4.5
Zhang Pingxiu,Li Meng,Jing Yidan,Zhang Xiaomin,Su Shengpei,Zhu Jin,Yu Ningya
Cellulose has received extensive attention as hydrogel electrolytes in energy storage fields, due to its renewable and environmentally friendly properties. However, it is still difficult to prepare cellulose-based hydrogel electrolytes for supercapacitors with high flexibility, high specific capacitance, and good temperature resistance. Herein, a series of cellulose-based hydrogel electrolytes with good mechanical properties were prepared successfully by incorporating with a small amount of acrylamide/ N , N ′-methylene bisacrylamide via a simple one-pot strategy and, successively, the resultant hydrogel electrolytes were assembled with the commercial activated carbon, as electrode materials, yielding quasi solid-state symmetric supercapacitors. It was found that the optimum hydrogel electrolytes prepared with 15 wt.% acrylamide/ N , N ′-methylene bisacrylamide possessed the tensile strength and break elongation as high as 18.7 kPa and 743.3%, respectively. The supercapacitors originating from the above electrolytes showed the excellent electrochemical performance. The specific capacitance could achieve 163.7 F g −1 at 1.0 A g −1 and the corresponding capacitance retention was 87.9% after the constant charge–discharge cycles for 8000 times. Moreover, the supercapacitors could be operated at various bending angles (0°– 180°) and low temperature (− 30 °C) without significant loss of capacitance. These results indicate that the cellulose-based hydrogel electrolytes presented here would have great potential in the application of flexible energy storage devices.
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2023
·Vol. 40
·期 1
·104-111
·
IF 2.7
Cheng Ying,Zhang Wei,Shi Biqing,Li Siqi,Dong Bing,Quan Yulian,Ji Xianbin
Magnesium hydride (MgH 2 ) is one of the promising solid-state hydrogen storage materials because of its high capacity, abundant resource and excellent reversibility. However, the high dehydrogenation temperatures and sluggish kinetics restrict its practical application. It was found that doping catalysts could significantly improve the hydrogen storage properties of MgH 2 . The solid solution Ce 0.8 Mn 0.1 Zr 0.1 O 2 (denoted as CeMnZr) with abundant oxygen vacancy was synthesized and its catalytic influence on the hydrogen sorption properties of MgH 2 have been investigated. CeMnZr modified MgH 2 composite showed a reduced initial decomposition temperature, almost 62 K lower than the pristine MgH 2 . At 473 K, MgH 2 -CeMnZr composite had an absorption capacity of 4.08 wt% hydrogen within 3,500 s, which was about twice better than the pure MgH 2 at same condition. MgH 2 -CeMnZr sample could desorb 2.56 wt% of H 2 within 3,500 s at 573 K compared to low desorption rate and 0.85 wt% H 2 by as-milled MgH 2 . The activation energy (Ea) for CeMnZr codoped MgH 2 sample is about 50kJ·mol −1 lower than the milled MgH 2 . Based on the characteration analysis, the in-situ generated MgO and CeH 2.51 species as well as abundant oxygen vacancy is believed to play synergistic catalytic effects in enhancing the hydrogen storage properties of MgH 2 .
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