Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 47
·12879-12887
·
IF 5.976
Zhuang Li,Fei Liang,Yangwu Guo,Zheshuai Lin,Jiyong Yao,Guochun Zhang,Wenlong Yin,Yicheng Wu,Chuangtian Chen
Demands for UV birefringent materials are growing dramatically owing to the rapid development of ultraviolet technology. Here, a new family of UV birefringent materials, Ba2Mg(C3N3O3)2 (BMCY) and Ba2Ca(C3N3O3)2 (BCCY), have been successfully discovered. It is the first time that the excellent birefringent properties of cyanurates have been studied. These materials exhibit an extremely large birefringence (Δn = 0.728–0.351 and 0.771–0.346 from 230 nm to 800 nm for BMCY and BCCY, respectively), much larger than that of the commercial UV birefringent crystal α-BaB2O4 (α-BBO) (Δn = 0.12@532 nm). Our study indicates that the impressive optical properties of BMCY and BCCY stem from the strengthened optical anisotropy of the planar (C3N3O3)3− group compared with the isoelectronic (B3O6)3− group. Besides, its congruent-melting properties make it feasible to grow a bulk crystal by the Bridgman–Stockbarger technique. The extraordinary properties of BMCY and BCCY may shed light on a new path to explore birefringent materials for practical application.
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IRANIAN POLYMER JOURNAL
·
2025
·
IF 2.8
Duan Qiancheng,Dong Xiang,Sun Zhiyu,Dai Guowei,Li De-long,Xie Le,Liu Song
A novel multifunctional flame-retardant DOPO-AS/M(OH)(OCH 3 ) (M = Co, Ni) was synthesized and incorporated into epoxy resin (EP) to prepare EP composites with enhanced flame retardancy and mechanical properties. Specifically, the DOPO-AS was synthesized using 3-aminopropyltriethoxysilane (APTES), salicylaldehyde (Salal), and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO). The 2D nanosheet M(OH)(OCH 3 ) was surface modified with DOPO-AS, thereby synthesizing the organic/inorganic nanohybrid DOPO-AS/M. The results showed that the addition of only 5% (by wt) DOPO-AS/M enabled EP to achieve the UL-94 of V-1 rating, with the limiting oxygen index (LOI) increasing from 28.7% to 31.0%. The thermogravimetric analysis (TGA) results demonstrated that the EP/DOPO-AS/M composite exhibited a significant enhancement in thermal stability compared to pure EP. Meanwhile, EP/DOPO-AS/M 5% composite showed significant reduction of 48.1%, 14.7%, 30.9%, and 22.7% in the peak heat release rate (pHRR), total heat release (THR), smoke production rate (SPR), and total smoke production (TSP), respectively. In addition, the tensile strength and elongation-at-break of the EP composite with 1% (by wt) DOPO-AS/M were increased by 13.5% and 3.2%, compared with pure EP. This work provides a novel and facile strategy for the simultaneous enhancement of flame retardancy and mechanical properties in EP composites, showing promising potential for practical applications. Graphical
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JOURNAL OF NANOPARTICLE RESEARCH
·
2017
·Vol. 19
·期 6
·1-15
·
IF 2.02
Qin Xin,Shi Penghui,Liu Haolin,Fan Jinchen,Min Yulin,Xu Qunjie,Yao Weifeng
Metal nanoparticles have been combined with magnet metal–organic frameworks (MOFs) to afford new materials that demonstrate an efficient catalytic degradation, high stability, and excellent reusability in areas of catalysis because of their exceptionally high surface areas and structural diversity. Magnetic M
x
O
y
@N-C (M = Fe, Co, Mn) nanocrystals were formed on nitrogen-doped carbon surface by using 8-hydroxyquinoline as a C/N precursor. The Co@N-C, MnO@N-C, and Fe/Fe 2 O 3 @N-C catalysts were characterized by X-ray diffraction (XRD), Raman, scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), N 2 adsorption/desorption, and X-ray photoelectron spectroscopy (XPS). The catalytic performances of catalysts were thoroughly investigated in the oxidation of aniline solution based on sulfate radicals (SO 4
−. ) toward Fenton-like reaction. Magnetic M
x
O
y
@N-C exhibits an unexpectedly high catalytic activity in the degradation of aniline in water. A high magnetic M
x
O
y
@N-C catalytic activity was observed after the evaluation by aniline degradation in water. Aniline degradation was found to follow the first-order kinetics, and as a result, various metals significantly affected the structures and performances of the catalysts, and their catalytic activity followed the order of Co > Mn > Fe. The nanoparticles displayed good magnetic separation under the magnetic field.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Hui Chen,Guo-Dong Li,Meihong Fan,Qian Gao,Jiabo Hu,Saren Ao,Cundi Wei,Xiaoxin Zou
Transition metal spinel semiconductors, with a general formula of AB 2 O 4 , have been shown as a promising group for gas sensor applications. This paper reports a simple and effective electrospinning method to systematically prepare mesoporous MGa 2 O 4 (M Ni, Cu, Co) nanofibers. It is found that gas sensing reaction process of the materials is decisively influenced by transition metal M(II)-ions. The gas response tends to decrease in the order of NiGa 2 O 4 > CuGa 2 O 4 > CoGa 2 O 4 . In addition, NiGa 2 O 4 and CoGa 2 O 4 show p-type behaviors, and CuGa 2 O 4 shows an n-type behavior. Further analysis reveals that charge carrier hopping (e − hopping or h + hopping) processes between different valent metal cations, which is mainly dominated by octahedral sites of spinel, are responsible for the conductivity type, the surface redox reaction and thereby the gas sensing properties.
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NEW JOURNAL OF CHEMISTRY
·
2015
·Vol. 39
·期 8
·6474-6481
·
IF 3.086
Yansheng Liu,Wei Zhang,Xinlin Li,Xuanduong Le,Jiantai Ma
In this study, Pd nanoparticles functionalized on the surface of a Fe3O4@SiO2@m-SiO2 nano-catalyst has been synthesised with accessible active sites and ultra-large surface areas. The Pd/Fe3O4@SiO2@m-SiO2 nano-catalyst can be recovered by applying an external magnetic field. The catalytic activity of Pd/Fe3O4@SiO2@m-SiO2 is tested in the catalytic reduction of 4-nitrophenol and the hydrodechlorination of 4-chlorophenol. The high catalytic activity is attributed to the well-dispersed Pd nanoparticles on the ultra-large surface of Fe3O4@SiO2@m-SiO2. Furthermore, the Pd/Fe3O4@SiO2@m-SiO2 nano-catalyst can be reused at least five times without significant loss in activity, which confirms its good stability. Therefore, the approach mentioned above that is based on core–shell structured magnetic Pd/Fe3O4@SiO2@m-SiO2 provides a useful platform for the fabrication of Pd NP based catalysts that feature easy accessibility, superior activity and convenient recovery.
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CATALYSIS LETTERS
·
2014
·Vol. 144
·期 6
·1001-1008
·
IF 2.291
Lin Chao,Tao Kai,Hua Dayin,Ma Zhen,Zhou Shenghu
Abstract Bimetallic Au 3 M (M = Ni, Co, Fe) nanoparticles (NPs) were synthesized by reducing a mixture of Au 3+ and metal cations (Ni 2+ , Co 2+ , Fe 3+ ) by butyllithium in the presence of oleylamine. Au 3 M NPs were then deposited onto a commercial SiO 2 support. The Au 3 M/SiO 2 samples were not particularly active in the catalytic reduction of p -nitrophenol unless they were converted into Au–MO
x
/SiO 2 after appropriate thermal treatment in air. The Au–MO
x
/SiO 2 catalysts showed good thermal stability and significantly higher p -nitrophenol conversions than Au/SiO 2 . Relevant characterization was conducted employing X-ray diffraction, transmission electron microscopy, Fourier-transform infrared spectroscopy, and ultraviolet–visible spectroscopy. Graphical Abstract
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APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
·
2014
·Vol. 172
·期 8
·3913-3925
·
IF 1.687
Zhang Jian-Fen,Yang Bo,Chen Weiqing,Chen Jing
A soluble glucoside 3-dehydrogenase (G3DH) was purified from a newly isolated Sphingobacterium faecium ZJF-D6 CCTCC M 2013251. The enzyme was purified to 35.71-fold with a yield of 41.91 % and was estimated by sodium dodecyl sulphate–polyacrylamide gel electrophoresis with a molecular mass of 62 kDa. The sequences of two peptides of the enzyme were all contained in a GMC family oxidoreductase (EFK55866) by mass spectrometry analysis. The optimal pH of the enzyme was around 6.2. The enzyme was stable within a pH range of 5.0–6.6 and was sensitive to heat. G3DH from S. faecium exhibited extremely broad substrate specificity and well regioselectivity to validoxylamine A. The enzyme was completely inhibited by Hg 2 Cl 2 and partly inhibited by Cu 2+ , Fe 2+ , Ca 2+ , and Cd 2+ . The apparent K
m
values for D-glucose, sucrose, and validoxylamine were calculated to be 1.1, 1.7, and 2.1 mM, respectively. With this purified enzyme, 3-keto sucrose was prepared at pH 5.0, 30 °C for 10 h with a yield of 28.7 %.
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Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 45
·22708-22715
·
IF 7.443
Chunxiao Lv,Xianfeng Yang,Ahmad Umar,Yanzhi Xia,Yi(Alec) Jia,Lu Shang,Tierui Zhang,Dongjiang Yang
The increasing demand for high performance lithium ion batteries (LIBs) has aroused great interest in developing high specific capacity, cycle performance and rate capability anode materials. Transition metal oxides (TMOs) have attracted much attention as promising anode materials for rechargeable LIBs owing to their high theoretical capacity. Here, a general strategy has been developed to fabricate high-performance fibrous TMO anodes such as elemental Ni doped NiO fibre (NiO/Ni/C-F), yolk–shell structured carbon@Fe2O3 fibre (C@Fe2O3-F), and hollow CuO fibre (CuO-HF) with controllable nanostructures by using alginate microfibres as templates. The key to the formation of various TMO micro-/nano-structures is the templating ability of the natural structure of long alginate molecular chains, where the metal cations can be confined in an “egg-box” via coordination with negatively charged α-L-guluronate blocks. When tested as anode materials for LIB half cells, these fibrous electrodes deliver excellent cycling performance with no capacity decrease after 200 cycles (793 mA h g−1, NiO/Ni/C-F, 0.072 A g−1; 1035 mA h g−1, C@Fe2O3-F, 0.1 A g−1; 670 mA h g−1, CuO-HF, 0.067 A g−1), and demonstrate great rate performance at different current densities. This finding highlights a general, green and eco-friendly strategy for the scale-up production of potential high-performance TMO anodes for LIBs.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Haiyan Wang,Pei Liu,Wenjing Jiang,Xue Li,Huanshun Yin,Shiyun Ai
DNA methylation is one of the important epigenetics events, and it is responsible for transcription, genomic imprinting and cellular differentiation. Aberrant DNA methylation is always contacted with various diseases. Herein, a simple and low-cost photoelectrochemical (PEC) biosensing method is proposed for detection of DNA methylation, assay of DNA methyltransferase (MTase) activity and screening of MTase inhibitor, which is based on M. SssI MTase- HpaII endonuclease system. The graphite-like C 3 N 4 (g-C 3 N 4 ) and CdS quantum dots (CdS QDs) are used as photoactive materials. After the double-stranded DNA (dsDNA) was treated with M. SssI MTase in the presence of S -adenosylmethionine, the methylated dsDNA cannot be digested by HpaII endonuclease and dithiol group at the terminal of dsDNA can be retained. As a result, CdS QDs could be coupled successfully with methylated dsDNA between the reaction of CdS QDs with dithiol of dsDNA, achieving the amplification of PEC response. Thus, the photocurrent of PEC biosensor is consistent with the M. SssI activity. The increased photocurrent was in proportion to M. SssI activity in the linear range from 1 to 80 U/mL with a detection limit of 0.316 U/mL. Furthermore, the effects of atrazine and azamethipos on M. SssI MTase activity were investigated, which might provide useful information on carcinogenic mechanism of pesticide. The PEC biosensor has potential to screen of DNA MTase inhibitor, providing valuable information for anti-cancer drug research and also for cancer therapy.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Hongping Wan,Yunhan Yang,Zhiwen Tu,Mingrun Tang,Bo Jing,Yumei Feng,Jiulong Xie,Huile Gao,Xu Song,Xinghong Zhao
In mucosal vaccination, the targeted delivery of antigens through M (microfold) cells is essential for initiating a robust antigen-specific immune response. In the present study, we devised a nano-delivery platform to target M cells. This platform involved coating mesoporous silica nanoparticles (MSN) with a mucoadhesive chitosan-catechol (Chic) layer, incorporating a recombinant antigen to form nanoparticles that enhance the immune response. The collagenase equivalent domain (COE) of porcine epidemic diarrhea virus (PEDV) terminated with the M cell-targeting sequence RGD (COER), was initially expressed by Escherichia coli ( E. coli ) and subsequently conjugated to the surface of MSN-Chic, forming the MSN-Chic-COER nanoparticles. MSN-Chic-COER with strong mucoadhesive properties and a propensity for M cell targeting, demonstrated enhanced uptake by dendritic cells (DCs) and trafficking to lymph nodes, compared to COE/COER after intranasal administration. MSN-Chic-COER recruited more dendritic cells to the antigen-located site via stimulating chemokine CCL20 secretion was evidenced by cell co-culture model. Additionally, it enhanced antigen permeability by disrupting the distribution of the ZO-1 protein in epithelial cells. Notably, MSN-Chic-COER elicited a higher level of cellular immunity, humoral immunity, and PEDV neutralizing antibody production. These findings underscore the potential of MSN-Chic-COER as a promising intranasal vaccine delivery system.
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Environmental Science-Advances
·
2024
·Vol. 3
·期 5
·763-775
·
IF 3.5
Youmei Xu,Yuchao Chen,Mengxia Wang,Yufei Shu,Siyu Cao,Zhongying Wang
Nitrophenol wastewater treatment and extracting and reusing precious metals from electronic wastewater have recently gained considerable attention. In this study, polyaniline-based membranes showcased remarkable gold recovery capability from electronic wastewater, effectively reclaiming 100% of gold on the membrane surface even in the presence of competing metal cations. The prepared Au@PmPD membrane, characterized by its high specific surface area and abundant Au nanoparticles (NPs), demonstrated excellent catalytic activity and stability, maintaining near 100% conversion efficiency in reducing 4-NP to 4-AP in the presence of NaBH4 over extended durations. Compared with the conventional physical mixing method, our in situ formation of the Au@PmPD membrane highlights the superior distribution of Au NPs and active sites for enhanced catalytic efficiency. It eliminates the need for additional steps to load Au NPs onto the membrane, resulting in a more straightforward and efficient process. Overall, this research provides a sustainable approach to repurposing waste into precious resources and offers a promising solution for the efficient treatment of persistent organic pollutants in wastewater, aligning with the principles of a circular economy.
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CATALYSIS LETTERS
·
2024
·Vol. 155
·期 1
·1-17
·
IF 2.3
Wei Ruiping,Wang Ziqi,Yao Mingzhu,Xia Rongying,Liu Huijun,Yang Lei,Ma Guanghui,Gao Lijing,Xiao Guomin
The metal-organic frameworks (MOFs) with oxidative and acidic active sites demonstrate promising potential for tandem reactions involving olefin oxidation carboxylation. In this study, M-BTCs were synthesized via a solvothermal method, employing 1,3,5-benzenetricarboxylic acid (H 3 BTC) as a ligand in combination with various metals (Mn, Co, Cu, Ni). The good thermal stability and morphology of M-BTC was verified by various characterization techniques, and its catalytic performance was evaluated for oxidative carboxylation. The catalytic activity of Mn-BTC, with Mn 3+ / Mn 2+ as the primary oxidation site, was found to be superior in both olefin epoxidation and CO 2 cycloaddition. The effects of reaction conditions on both epoxidation of styrene and the cycloaddition reaction were investigated, respectively. Under optimal reaction conditions (epoxidation: 10 wt% Mn-BTC of styrene, 80 ℃ for 12 h; cycloaddition: 100 ℃ for 12 h with a CO 2 flow rate of 15 ml/min and tetrabutylammonium bromide (TBAB) amount of 15 mol%), a 53% yield of styrene carbonate (SC) was obtained in the assisted tandem reactions. Furthermore, cycling experiments as well as XRD and FT-IR spectra of the catalysts after use demonstrated that Mn-BTC maintained its crystal structure and retained a yield of 49% SC after three cycles. Finally, a possible mechanism for assisted tandem catalytic reaction over Mn-BTC was proposed. Graphic
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