MICROCHIMICA ACTA
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2018
·Vol. 185
·期 12
·1-9
·
IF 5.705
Wang Yongping,Yue Qiaoli,Tao Lixia,Zhang Cong,Li Chen-Zhong
N/S/P-codoped carbon dots (CDs) are shown to be a viable fluorescent probe in a turn-off-on fluorometric assay for hydroquinone (HQ). The preparation of CDs was carried out using a one-step hydrothermal reaction starting with glyoxal and isocarbophos. The method is based on the formation of ground state complexes between CD and Fe(III) which leads to quenching of blue fluorescence (with excitation/emission peaks at 363/448 nm). On addition of HQ, it will be oxidized by Fe(III) upon which fluorescence recovers. This turn-off-on system can be utilized to quantify HQ. A linear relationship exists between fluorescence recovery and HQ concentration in range between 0.56 and 375 μM. The limit of detection is 0.16 μM. The assay was successfully applied to the determination of HQ in spiked water samples and developer samples.
Fluorometric determination of hydroquinone (with good selectivity over catechol and resorcinol) by using blue-emitting N/S/P-codoped carbon dots and the quenching effect of Fe(III).
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ACS Applied Materials & Interfaces
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2019
·
IF 8.456
Wei Ma,Lin Li,Xinghuan Lin,Yingfeng Wang,Xuehong Ren,Tung-Shi Huang
Cutaneous hemorrhage often occurs in daily life which may cause infection and even amputation. This research aims to develop a novel chitosan dressing impregnated with ZnO/N-halamine hybrid nanoparticles for quick antibacterial performance, outstanding hemostatic potential, high porosity, and favorable swelling property through combining sonication and lyophilization processing. After 30 days of storage, about 90% bacterial cell viability loss could be observed toward both Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli O157:H7 within 30 min of contact by colony counting method. The hybrids assembled much more platelet and red blood cell as compared with pure chitosan control. Moreover, the lower blooding clotting index value gave evidence that these composites could control hemorrhaging and reduce the probability of wound infection. No potential skin irritation and toxicity were detected using in vitro cytocompatibility and a skin stimulation test. Therefore, this work demonstrated a facile and cost-effective approach for the preparation of N-halamine-based hybrid sponges which show promising application for wound dressings.
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INTEGRATED FERROELECTRICS
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2019
·
IF 0.486
Chengyi Chu,Huangsheng Wu,Aihua Sun,Xiaobing Tang,Yugang Yan,Guoxiong Shao,Zhixiang Li,Jianjun Guo,Gaojie Xu
The multresponsive photonic hydrogels (MRPHs) based on Fe3O4@C NPs and Acrylamide-N-isopropylacrylamide (AM-NIPAM) was prepared by UV polymerization process with the help of magnetic field. This work is mainly about the long-term stability of MRPHs. The mechano-response performance of MRPHs after being remained in water for a year has been measured and discussed in details. The result shows that the MRPHs were still very sensible and exhibit brilliant structure color. The reflectance peak of MRPHs changed markedly (from 700 nm to 550 nm) as increasing compression from 0 to 1N and the structure color change can be made reversible for ∼100 times or even more if necessary. Besides, the structure color of MRPHs was broken after being natural air-dried for 3 months and it can recover when dried MRPHs were immerged in water for 10 hours. So the MRPHs have good stability and the structure color can persevere for long time without fading, which contributes to the piratical application of MRPHs used as sensors.
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Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 11
·3181-3189
·
IF 6.641
Xin Cheng,Lin Wang,Fengmei Gao,Weiyou Yang,Zhentao Du,Ding Chen,Shanliang Chen
The third-generation semiconductor silicon carbide (SiC) is identified as one of the vitally important candidate materials to serve as a functional unit that performs stably and reliably under harsh working conditions, with respect to its excellent piezoresistive effects and robust physical/chemical characteristics. In the current work, we put forward the fabrication of SiC nanowires with co-doped N and P elements, which were fabricated via the pyrolysis of a polymeric material. The as-grown nanowires have a typical diameter of ∼260 nm with a 10 surface. The measured transverse piezoresistance coefficient π[10] of the established SiC nanowires increased from 5.07 to −146.30 × 10−11 Pa−1 as the loading forces varied from 24.95 to 130.51 nN. Meanwhile, the corresponding gauge factor (GF) was calculated up to ca. −877.79, which is higher than the values for all SiC nanostructures ever reported. The mechanism concerning the giant negative piezoresistance behavior of SiC nanowire is proposed. The current exploration may pave a new avenue for the development of highly sensitive and robust pressure sensors that could survive under harsh working conditions.
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FUEL
·
2019
·
IF 5.128
Xiaojie Li,Erjiang Hu,Xin Lu,Shihan Huang,Zuohua Huang
Laminar flame speeds of hexene isomers (1-hexene, 2-hexene and 3-hexene) and n-hexane are investigated at equivalence ratios of 0.8–1.5, initial temperatures of 373–453 K and initial pressures of 0.1–0.5 MPa using a constant volume combustion chamber . Results show that laminar flame speeds of hexene isomers are similar to each other and higher than those of n-hexane. NUI model, Fan model and LLNL model are validated against the experimental data. Simulation results of NUI model and Fan model agree well with experimental data while results of LLNL model show large discrepancies. The discrepancies between hexene isomers and n-hexane are mainly caused by thermal effect. Reaction pathway analysis shows that hexene isomers undergo similar reactions including H-abstraction reactions, radical-addition reactions and unimolecular decomposition reactions . Sensitivity analysis also reveals that the sensitivity coefficients of fuel specific reactions of hexene isomers are close to each other on the whole.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Shihang Guo,Yi Feng,Jianhao Qiu,Xiaodan Li,Jianfeng Yao
Transition metal sulfides have attracted wide attention in energy storage, especially in Li-ion batteries anodes due to the high theoretical capacity and low cost. However, their poor stability and rate performance have hindered their further development. Here, leaf-shaped ZIF (zeolitic imidazole framework) was used as precursor to prepare two-dimensional (2D) CoZnS x @N-doped Carbon (L-Co 2 Zn 1 -S) to address this problem. The different distribution of Zn 2+ and Co 2+ will greatly influence the morphology of products. L-Co 2 Zn 1 -S displays great cycling performance of specific capacity of 527 mA h g −1 at 0.5 A g −1 after 200 cycles with Coulombic efficiency of about 99% and excellent rate capability as lithium-ion battery anode. This superior electrochemical performance can be ascribed to 2D N-doped carbon structure and synergistic effect of bimetallic sulfide. This work not only casts a new light on the design of bimetallic sulfides but also provides a manufacturing method of 2D carbon matrix.
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MICROCHEMICAL JOURNAL
·
2019
·
IF 3.206
Xu Chen,Jianliang Bai,Yusha Ma,Guojun Yuan,Jing Mei,Lu Zhang,Lili Ren
Recently, carbon dots (CDs) with long wavelength (i.e., orange and red-light) are gradually critical in the bioimaging and biomedical fields. In this paper, a simple one-pot hydrothermal method for preparing bright orange N-doped carbon dots (N-CDs) from p -phenylenediamine has been developed. The resulting N-CDs with abundant surface functional groups show strong orange fluorescence, certain water solubility property and obvious fluorescence quenching to Fe 3+ ions and pH. What's more, the fluorescence of the N-CDs displays a consequent color variation with the increasing concentration of Fe 3+ and pH. In short, N-CDs can be considered as an efficient and multifunctional fluorescent sensor for monitoring pH and Fe 3+ because of their prominent biocompatibility and low toxicity characteristics.
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ACS Applied Nano Materials
·
2018
·
IF 0
Shengshuai Gao,Qingda An,Zuoyi Xiao,Shangru Zhai,Dongjiang Yang
Microwave absorption materials with great reflection loss and wide absorption band that can provide electromagnetic waves (EMWs) absorption with minimal thickness are highly desirable, particularly when they could be controllably fabricated through a facile process. Herein, N-doped three-dimensional (3D) carbonaceous composites with highly dispersed nickel nanoparticles (N-SA/Ni-X, X = 3%, 6%, 9%) were successfully prepared by a facile one-step encapsulation process and carbonization. The performance of the absorber has a significant enhancement due to the introduction of nitrogen elements into a carbon network for controlling the dispersion and size distribution of Ni nanoparticles. When a 6% Ni2+ mass percentage was used, the maximum reflection loss (RL) could reach −42.2 dB at 9.8 GHz. Moreover, the effective absorption (below −10 dB) bandwidth can be increased by 2.3 GHz, from 8.5 to 10.8 GHz, with the absorber thickness of only 2 mm, and it can be tuned from 2.8 to 14.4 GHz by adjusting the thickness from 1.5 to 5 mm. The excellent electromagnetic-wave-absorbing performance could be assigned to the combinatorial advantages of the lightweight conductive porous network with favorable dielectric loss and magnetic loss features induced by highly dispersed Ni nanoparticles. These newly fabricated N-SA/Ni-X composites could be regarded as promising candidates for lightweight and high-performance microwave absorption materials.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Suyun Zhang,Xinxin Xiao,Taotao Lv,Xiaomeng Lv,Botao Liu,Wei Wei,Jun Liu
Exploring efficient and economical Pt-free electrocatalysts is of great significance for the electrocatalytic hydrogen evolution reaction (HER). However, the rational design on an industrial scale is a formidable challenge. Herein, we reported a facile calcination at controlled temperatures to fabricate rationally assembled cobalt nanoparticles embedded in defect-rich N-doped carbon nanotubes (Co-NCNTs), which was derived from low-cost dicyanadiamide thermally polymerized with cobalt precursor forming metal-organic frameworks, then further calculation leading to final products. The as-obtained samples were endowed with high content of N as electrocatalytic active site, defect-rich structure and excellent synergistic effect between cobalt nanoparticles and carbon nanotubes toward electrocatalytic HER . As expected, Co-NCNTs were highly active and long-term stable with onset potentials of c.a. 15 mV in acidic electrolytes (0.5 M H 2 SO 4 ), 70 mV in alkaline (1 M KOH) and 300 mV in neutral media (pH 7). Specially, to achieve the current density of 10 mA cm −2 , the overpotential of 103 mV in acid, 204 mV in alkaline and 337 mV in neutral media was obtained. The enhanced HER performance was discussed in detail by adjusting the molar ratio of precursor and metal species. Moreover, the present synthetic route is easy to scale up and expand to other non-noble metal and alloy.
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Small
·
2018
·Vol. 14
·期 19
·1800367
·
IF 9.598
Hui Li,Si-Min Xu,Hong Yan,Lan Yang,Sailong Xu
Exploring highly efficient and stable oxygen evolution reaction (OER) electrocatalysts such as transition-metal phosphides (TMPs) is critical to advancing renewable hydrogen fuel. TMP nanostructures typically involving binary or ternary TMPs tuned by cation or anion doping are suggested to be promising low-cost and durable OER catalysts. Herein, the preparation of CoP/CoP 2 composite nanoparticles encapsulated within N,P-doped carbon nanotubes (CoP/CoP 2 @NPCNTs) is demonstrated as a synergistic electrocatalyst for OER via the calcination of a CoAl-layered double hydroxide/melamine mixture and subsequent phosphorization. Facile visualization by scanning electron microscopy in conjunction with electron backscatter diffraction demonstrates the encapsulation of the CoP/CoP 2 nanoparticles within the N,P-codoped CNTs. Electrocatalytic evaluation shows that the composite electrode requires a low overpotential of 300 mV for the OER at 10 mA cm −2 in a 1.0 m KOH solution and, in particular, exhibits an excellent long-term durability of ≈100 h, which is superior to that of the state-of-the-art RuO 2 electrocatalyst. Density functional theory calculations reveal that the synergistic effect of CoP and CoP 2 can enhance the electrocatalytic performance. In addition, molecular dynamics simulations demonstrate that the generated O 2 molecules can readily diffuse out of the CNTs. Both the effects give rise to the observed OER enhancement.
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Polymers
·
2018
·Vol. 10
·期 4
·441
·
IF 2.935
Weiqiu Wen,Jianwei Guo,Xi Zhao,Xiong Li,Hongmei Yang,Jem-Kun Chen
Considering the poor compatibility and water-resistance of sulfonate flame retardants for polycarbonate (PC), an efficient S/N-based flame retardant named 1,3,5,7-tetrakis(phenyl-4-sulfonyl-melamine)adamantane (ASN) has been developed. Fire properties studies of PC/ASN blends indicate that the addition of 0.10 wt % ASN imparts a V-0 rating and a limited oxygen index (LOI) value of 30.1% to PC specimens, and ASN can suppress the heat and toxic gas release of PC composites. Additionally, PC/ASN blends are believed to be exceptional materials for outdoor PC applications due to their superior water-resistance properties. Moreover, mechanical properties were further systematically investigated, and the correlative results indicate that the tensile strength and rigidity of specimens are improved with the addition of ASN.Keywords:flame retardant;adamantane;polycarbonate;fire properties;water-resistance
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ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 28
·期 10
·1705876
·
IF 13.325
Fengyun Li,Chunyan Wang,Weiwei Guo
The development of highly efficient, recyclable, and multifunctional biocatalysts is of great importance for various applications, especially in biosensing. In this study, highly catalytic and recyclable DNAzyme functionalized poly- N -isopropylacrylamide (pNIPAM) microgels are prepared via one-step precipitation polymerization. The pNIPAM/DNAzyme microgels exhibit highly catalytic activities in aqueous solution at room temperature, and become hydrophobic and separable from the reaction mixture at temperature higher than the lower critical solution temperature of pNIPAM, which facilitate the recyclable utilization of these catalysts. Different kinds of DNAzyme functionalized catalytic microgels can be facilely prepared via the one-step synthesis procedure. Two typical catalytic DNA structures, the Mg 2+ -dependent DNAzyme and the hemin-G-quadruplex horseradish peroxidase (HRP)-mimicking DNAzyme, are chosen as model systems to validate the feasibility. These pNIPAM/DNAzyme microgel catalysts maintain 80% to 91% initial catalytic activity after eight times of catalysis recycling. Furthermore, the pNIPAM microgels by themselves provide additional interfaces to capturing an enzyme, glucose oxidase, which can cascade with the linked HRP mimicking DNAzymes, to form recyclable bi-enzyme cascading system for the sensing of glucose.
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