Journal of Materials Chemistry B
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2021
·Vol. 9
·期 12
·2877-2884
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IF 6.331
Yanping Cao,Shengjie Liu,Zhaoqiang Wu,Hong Chen
Linear poly(N-hydroxyethylacrylamide) (PHEAA) is regarded as one of the most promising antifouling materials because of its excellent antifouling properties and good hemocompatibility. However, the antifouling performance of topological PHEAAs remains largely unknown. Herein, the preparation of antifouling surfaces based on a tadpole-shaped PHEAA coating is reported for the first time, and how the tadpole-shaped PHEAA architecture affects antifouling performance is investigated. It is shown that the tadpole-shaped PHEAA-modified surfaces exhibit better antifouling performance than linear copolymer precursor-modified surfaces with identical molar masses and chemical compositions. This may be primarily attributed to the presence of cyclic PHEAA head chain segments in the tadpole-shaped PHEAA copolymer, and the absence of interchain entanglements can facilitate the formation of smoother and densely packed grafts, which result in better antifouling properties.
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Asian Journal of Organic Chemistry
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2021
·Vol. 10
·期 3
·668-673
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IF 3.319
Yuan Chen,Fo-Yun Lu,Rui-Xue Li,Zhi Guan,Yan-Hong He
Graphical A visible light-mediated reaction of N -phenylpropynamide with diethyl 2,2-dibromomalonate has been developed for the synthesis of bromo-substituted azaspirotrienedione. This method avoids the use of transition metals, peroxides and other substances that are harmful to the environment. Through radical addition/ipso-cyclization/oxidation cascade reaction, C−Br, C−C and C=O bonds can be formed in one pot. Various substituents of N -arylpropynamide are well tolerated and yield of the target product is up to 95%. A visible-light-mediated reaction of N -phenylpropynamides with diethyl 2,2-dibromomalonate for the synthesis of bromo-substituted azaspirotrienediones has been developed. This method allows the formation of C−Br, C−C and C=O bonds in one pot via a cascade radical addition/ipso-cyclization/oxidation process. A possible radical mechanism involving single electron transfer and energy transfer processes is proposed based on control experiments, cyclic voltammetry determination and Stern-Volmer quenching experiments.
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Colloid and Interface Science Communications
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2020
·
IF 2.831
Danxia Chai,Wenxin Liu,Xiufeng Hao,Heyuan Wang,Haixiao Wang,Yujiao Hao,Yue Gao,Huihui Qu,Lifang Wang,Alideertu Dong,Ge Gao
Antibacterial N -halamine coatings are successful in avoiding and eliminating bacterial infections caused by bacterial contamination and biofilms on the surfaces. However, the N -halamine coatings remain a long-standing challenge faced by our healthcare system. Herein we reported a new mussel-inspired surface modification strategy to achieve N -halamine copolymer coatings with adhesive effects. The phenolic hydroxyl groups from N -halamine copolymers are used for ligand exchange with oleic acid on the magnetic Fe 3 O 4 nanoparticles for binding the N -halamine copolymer onto the surface of the nanoparticles. The as-synthesized N -halamine coatings endow the magnetic Fe 3 O 4 nanoparticles antibacterial activity toward both Gram-negative bacteria ( Escherichia coli ) and Gram-positive bacteria ( Staphylococcus aureus ). Since the super-paramagnetism of Fe 3 O 4 in core, the N -halamine coatings are separable magnetically and remain high inactivating efficiency toward bacteria even after five cycles. We believe that, with the advantage of mussel-inspired strategy, the N -halamine coatings should have great potential for use in antibacterial and biomedical fields.
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RSC Advances
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2021
·Vol. 11
·期 14
·7954-7960
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IF 3.361
Jianxin Chen,Peng Miao,E. Emily Lin,Ting Bai,Stoyan K. Smoukov,Jie Kong
Microwave absorbents with specific morphology and structure have fundamental significance for tuning microwave absorption (MA). Herein, N-doped carbon sphere nanoparticles and hollow capsules were successfully fabricated via oxidative polymerization of dopamine in different mixed solutions, without any template preparation or etching process. Compared to solid particles, the microwave absorbents consisting of N-doped carbon with a hollow structure showed enormously enhanced MA performance, exhibiting a broad effective absorption bandwidth (from 12.7 GHz to 17.9 GHz) and a minimum reflection loss of −27.2 dB with a sample thickness of 2.0 mm. This work paves an attractive way for simple and eco-friendly preparation of advanced light weight microwave absorbents.
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DIAMOND AND RELATED MATERIALS
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2020
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IF 2.65
Chang Ma,Lei Liu,Fang Zhang,Yue Zhang,Senlin Hou,Aibing Chen
The hierarchical porous carbon (HPC) materials have rich porous structure , high specific surface area and reasonable porosity for a wide range of applications in many fields, such as catalysis, adsorption, and energy storage, etc. Although some synthetic strategies have been developed, efficient preparing HPC materials remains challenging. In this work, we propose a method to prepare N-doped hierarchical porous carbon (NHPC) by acetone dissolution following co-assembly process. 1-Alkyl-3-methyl imidazole bromide ([C 18 Mim]Br), tetraethyl orthosilicate (TEOS) and resorcinol-formaldehyde were co-assembled to form a pleated sheet composite material, where [C 18 Mim]Br induced formation of the sheet structure and also led to nitrogen doping in the carbon skeleton. TEOS created a mesoporous structure and increased specific surface area, while acetone dissolved the oligomer of the resin, creating a macroporous structure, but destroying the morphology of the sheet. At an appropriate amount of acetone, the resulting NHPC exhibits the hierarchical porous structure, high specific surface area and N-doping characteristics. When used as a supercapacitor material, NHPC exhibits the specific capacitance is as high as 241 F g −1 at 1 A g −1 . Furthermore, the symmetric supercapacitor manufactured with NHPC has a power density of 4.1 kW kg −1 , an energy density of 2.56 Wh kg −1 , and demonstrates excellent cycle stability of up to 92.82%, exhibiting the potential as good supercapacitor materials.
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FOOD CONTROL
·
2020
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IF 4.258
Xuejian Yu,Naiyan Lu,Jiyue Wang,Zhe Chen,Chen Chen,Joe Mac Regenstein,Peng Zhou
Nisin, the only antimicrobial peptide that has GRAS (generally considered as safe) status from both WHO and FDA, has the potential to become an important natural antibiotic as bacteria become more resistant to traditional antibiotics. Many studies have focused on how modification of nisin affects antimicrobial activity. In this study, nisin and chitosan were crosslinked using genipin to modify the N-terminal of nisin. The antimicrobial experiments were carried out on Staphylococcus aureus ATCC 6538. The results showed that nisin still retained antimicrobial activity after modification. When the crosslinking ratio of nisin to chitosan increased to 200: 1, MIC decreased from 48 μg/ml to 40 μg/ml. Less chitosan increased local number density and antimicrobial activity of nisin. When the local number density was high, adjacent peptides could cooperatively penetrate into the lipid membrane. The results of this study may help to better understand the antimicrobial mechanism and provide suggestions for the further modification of nisin.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Jiahao Yu,Jieyi Yu,Tongpan Ying,Xianguo Liu,Xuefeng Zhang,Dandan Han
Three main strategies for designing efficient microwave absorber includes the intrinsic dielectric/magnetic properties, the novel structure and the single atom doping. The Fe-N/C nanocomposites integrate the advantages of above three strategies into one system. In this work, the method for preparing Fe-N/C nanocomposite by calcining the FePc@ZIF-8 precursor under a flowing N 2 gas is described. Fe-N/C nanocomposites, displaying respectable dodecahedron-like morphology, have the merits of strong absorption ability, wide effective absorption bandwidth, thin thickness, and excellent microwave absorption efficiency, which are attributed to the synergistic effect of good electromagnetic loss capacity and proper impedance matching originating from intrinsic dielectric/magnetic properties, the novel structure and the single atoms (Fe and N) doping. Fe-N/C-24 composite delivers an optimal reflection loss of −30.98 dB, an effective absorption bandwidth of 5.04 GHz, the microwave absorption capacity of 87.61 dB GHz the absorption efficiency of 51.53 dB GHz/mm at 1.7 mm.
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Materials Today Physics
·
2020
·
IF 10.443
Juan Li,Shuai Zhang,Fei Jia,Shuqi Zheng,Xiaolei Shi,Daqiang Jiang,Siyu Wang,Guiwu Lu,Liming Wu,Zhi-Gang Chen
Approaching practical thermoelectric devices require high-performance and machinable thermoelectric materials . However, the currently available materials are usually brittle. In this work, Nd-doped Mg 3 Sb 2 -based compounds exhibit not only excellent thermoelectric performance but also superior machinability . Mg 3.2 Nd 0.03 Sb 1.5 Bi 0.5 exhibits a high power factor of 20.6 μW cm −1 K −2 at 725 K and a peak zT of 1.8, which mainly originates from the increased n of ~8 × 10 19 cm −3 by Nd/Mg substitutional defects. Defect calculations predict that other rare earth elements (Sm, Gd, Tb, Dy and Ho) have the same effect as Nd on Mg 3 Sb 2 and the predicted highest achievable electron concentrations at 700 K are ~10 20 cm −3 . The measured hardness, Young's modulus and fracture toughness of Mg 3.2 Nd 0.03 Sb 1.5 Bi 0.5 are 1.1 GPa, 49.8 GPa and 1.4 MPa m 1/2 , respectively. In addition, the sample can be easily machined into the dog-bone shape with external thread at both ends, indicating the excellent machinability of Mg 3 Sb 2 -based materials. This work suggests a bright future of Mg 3 Sb 2 -based thermoelectric materials for practical applications and device fabrication .
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Nanomaterials
·
2019
·Vol. 9
·期 12
·1714
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IF 4.034
Weiping Liu,Ximing Zhang,Zhaofeng Wang,Ruijian Wang,Chen Chen,Chengjun Dong
Cd/In-glycerate spheres are synthesized through a simple solvothermal method. After thermal treatment, these Cd/In-glycerates can be converted into CdIn2O4spheres. Many characterization methods were performed to reveal the microstructure and morphology of the CdIn2O4. It was found that pure CdIn2O4phase was obtained for the Cd/In starting materials at ratios of 1:1.6. The CdIn2O4spheres are composed by a large number of nanoparticles subunits. The CdIn2O4sphere-based sensor exhibited a low detection limit (1 ppm), high response (81.20 to 500 ppm n-butanol), fast response (4 s) and recovery (10 s) time, good selectivity, excellent repeatability, and stability at 280 °C. Our findings highlight the possibility to develop a novel gas sensor based on CdIn2O4for application in n-butanol detection with high performance.Keywords:gas sensor;n-butnaol;CdIn2O4;spheres;solvothermal method
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JOURNAL OF MEMBRANE SCIENCE
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2019
·
IF 7.015
Fang Hua Liu,Qian Yang,Xue Lang Gao,Hong Yue Wu,Qiu Gen Zhang,Ai Mei Zhu,Qing Lin Liu
To prepare anion exchange membranes (AEMs) with high performances, we tethered the as-synthesized oligomers with dense N-spirocyclic cations (NS) as the side-chain to poly(ether sulfone) (PES). The steric hindrance of spirocyclic structure and electron-donating effect of alkyl spacers significantly enhance the stability of cations in harsh alkaline and high hydration conditions. Correspondingly, the ionic exchange capacity (IEC) of PES–NS–10% only decreased by 13.8% and the conductivity remained 84.3% after being immersed in harsh environment (80 °C, 2 M NaOH) for 864 h. In addition, the high density of N-spirocyclic cations in the side-chain benefits the formation of clear microphase separation , as confirmed by atomic force microscopy (AFM) and transmission electron microscopy (TEM). The highest conductivity of 95.5 mS cm -1 was achieved by PES–NS–10% at 80 °C while the corresponding swelling ratio was only 7.69%. Furthermore, the single cell assembled with PES–NS–10% showed a peak power density of 110.1 mW cm -2 at 300 mA cm -2 . Durability test of the single cell based on PES–NS–10% under 100 mA cm -2 also demonstrates that the as-prepared AEMs with NS have potential application for fuel cells.
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Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 11
·3694-3704
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IF 7.059
Chen Li,Xin Chen,Ning Li,Jialiang Liu,Beilei Yuan,Yujiao Li,Mei Wang,Fan Xu,Yangqing Wu,Bingqiang Cao
Highly conductive n-type bismuth-doped CH3NH3PbI3 (MAPbI3:Bi) single crystals are successfully grown by the inverse temperature crystallization (ITC) method using bismuth iodide as the dopant source. As revealed by XRD analysis, the Bi-doped MAPbI3 single crystals maintain a perfect cubic perovskite structure (Pmm). Bi3+ ions are successfully incorporated into the MAPbI3 crystal lattice, which induces three orders of magnitude enhancement in the n-type electrical conductivity in a controllable way. Clear Urbach tails in the optical absorption spectra and continuous blue shifts in the room-temperature photoluminescence (PL) spectra are both observed after bismuth doping, which indicates the formation of bismuth induced donors and the release of more electrons to the conduction band. Temperature-dependent PL (TDPL) studies are adopted to study the optical fingerprints of bismuth induced donor defects in the MAPbI3 crystals. By analyzing the TDPL spectra in detail, it is found that the bound exciton (D0X) peak in doped MAPbI3:Bi has a stronger relative intensity and also a significant redshift in comparison with the pristine MAPbI3 crystal. This indicates that stable donor levels are formed in MAPbI3:Bi single crystals by bismuth doping. These results suggest that n-type perovskite crystals have been realized in a controlled doping way, and potential applications in bipolar perovskite-based optoelectronic devices could be realized.
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EUROPEAN POLYMER JOURNAL
·
2023
·
IF 6
Jun Li,Peng Huang,Xiangbin Sun,Xue Bai,Yufeng He,Rongmin Wang
Conventional N-halamine precursor polymers with excess hydrophilic/hydrophobic and rigid/flexible groups have failed to achieve a co-balanced effect of amphiphilicity and rigidity-flexibility. To overcome this problem, hydantoin terpolymer nanohemispheres (P(AMH-St-BA)NHs) were synthesized by regulating both hydrophilic/hydrophobic and rigid/flexible group ratios to 1:1 using emulsion polymerization. Thereafter, a novel N-halamine terpolymer nanohemisphere (P(ClA-St-BA)NHs) with antibacterial activity was fabricated through chlorination treatment. Interestingly, chlorinated nanohemispheres were more dispersed and regularly shaped. Moreover, the effective chlorine content (Cl + ) of P(ClA-St-BA)NHs was detected to be 1.1 % by iodometric/thiosulfate titration, and the existence of N-Cl bonds was supported from the color change of titration. In vitro cytotoxicity suggested that P(AMH-St-BA)NHs possessed superior biocompatibility and safety. Additionally, the antimicrobial performance of samples with three various morphologies was investigated, discovering that the antibacterial rates of P(ClA-St-BA)NHs up to 89.5 % and 93.5 % against E. coli and S. aureus , respectively, exhibited a stronger antimicrobial capability than membranous and porous N-halamine copolymers, which reveals that their special shape elevates the property. In parallel, the antibacterial mechanism of nanohemispheres was also explored, and it was recognized that indirectly released Cl + synergizes with direct contact of N-Cl bonds for antibacterial purposes. By designing nanohemispheres, this method helps to provide new thoughts for realizing the co-balancing effects of hydrophilicity/hydrophobicity and rigidity/flexibility.
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