FOOD CHEMISTRY
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2020
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IF 6.306
Yue Hu,Yingping Li,Yunwen Liao,Xiaohui Jiang,Zhengjun Cheng
A water-soluble, long-term stable, poly(sodium-p-styrenesulfonate)-enhanced and d -penicillamine stabilized argentum nanoclusters (PSS-DPA-AgNCs) was synthesized by a one-step ultraviolet radiation combined with microwave heating method. The effects of different types of polyelectrolytes and energy suppliers on the AgNCs photo-luminescence performance were investigated in detail. The prepared AgNCs are exhibited to be viable fluorescent method for 2-Mercapto-3-butanol (2-M-3-B), 3-Mercapto-2-butanone (3-M-2-B) and silicate (SiO 3 2− ) determinations. The fluorescence (FL) of PSS-DPA-AgNCs is quenched with the addition of 2-M-3-B/3-M-2-B/SiO 3 2− mainly originating from a static quenching process. The method can monitor 2-M-3-B/3-M-2-B by fluorometry with a linear response in the range of 0.33–90.0/0.33–80.0 μM and a 74/250 nM detection limit (at 3σ/slope). For the SiO 3 2− assay, corresponding data are 3.33–100.0 μM and 278 nM. Moreover, the proposed method was successfully used for the assays of two food flavors in the steamed bread and soda drinks, and silicate in the mineral water samples respectively.
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PubMed
高影响因子
Frontiers of Materials Science
·
2020
·Vol. 14
·期 1
·62-72
·
IF 1.747
Liu Guojin,Han Pengshuai,Chai Liqin,Lu Peng,He Yuping,Zhou Lan
Patterned photonic crystals with structural colors on textile substrates have attracted a special attention due to the great advantages in application, which currently become a research hot-spot. This study utilized an ink-jet printing technology to prepare high-quality photonic crystal patterns with structural colors on polyester substrates. The self-assembly temperature of poly(styrene-N-methylol acrylamide) (P(St-NMA)) microspheres set to construct photonic crystals were deeply optimized. Moreover, the structural colors of prepared photonic crystal patterns were characterized and evaluated. When the mass fraction of P(St-NMA) microspheres was 1.0 wt.%, the pH value ranged from 5 to 7, and the surface tension was in the range of 63.79 to 71.20 mN/m, inks could present the best print performance. At 60 °C, prepared P(St-NMA) microsphere inks were good for printing to obtain patterned photonic crystals with regular arrangement and beautiful structural colors. Specifically, photonic crystals with different colors could be constructed by regulating the diameter of microspheres in inks, and prepared structural colors exhibited distinct iridescent phenomenon. The present results could provide a theoretical basis for the industrial realization of patterned photonic crystals by ink-jet printing technology.
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JOURNAL OF POLYMER RESEARCH
·
2021
·Vol. 28
·期 7
·1-13
·
IF 3.097
Yao Qi,Lan Hai,Li Xin,Chen Youyi
Organic–inorganic interpenetrating network poly (acrylic acid- co -acrylamide) IPN-P(AA-co-AM) polymer sphere with core–shell structure has been synthesized by modified suspension polymerization, which the core is high cross-linked and shell is light cross-linked, respectively. The dispersed phase (water phase) and continuous phase (oil phase), as well as core and shell crosslinking agent are screened based on the water absorption capacity of the polymer spheres. In addition, SiO 2 is applied to endow polymer spheres with excellent thermal and water absorption properties. FTIR, TG, SEM, and XPS analyze the chemical structure, thermal properties, morphology and surface element of polymer spheres, respectively. Particularly, the forming mechanism of polymer spheres and water absorption dynamic model are discussed in detail. The results show that the Organic–inorganic IPN-P(AA-co-AM) polymer spheres are successfully synthesized. The polymer spheres could be wrapped effectively when the SiO 2 content up to 2%. Compared to polymer spheres without SiO 2 , the thermal stability is greatly improved. The optimum core and shell crosslinking agent are pentaerythritol triacrylate (PETA) and sodium alginate, respectively. The maximum absorption capacity of polymer spheres for distilled water and 0.9wt% sodium chloride can up to 922.22 g/g and 93.87 g/g, respectively. Finally, the water absorption of IPN-P(AA-co-AM) polymer spheres dynamic model is closed to second-order.
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JOURNAL OF NANOBIOTECHNOLOGY
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2021
·Vol. 19
·期 1
·1-20
·
IF 10.435
Deng Xuanru,Liu Hongxing,Xu Yuan,Chan Leung,Xie Jun,Xiong Zushuang,Tang Zheng,Yang Fang,Chen Tianfeng
Background The design of stable and biocompatible black phosphorus-based theranostic agents with high photothermal conversion efficiency and clear mechanism to realize MRI-guided precision photothermal therapy (PTT) is imminent.Results Herein, black phosphorus nanosheets (BPs) covalently with mono-dispersed and superparamagnetic ferrous selenide (FeSe2) to construct heteronanostructure nanoparticles modified with methoxy poly (Ethylene Glycol) (mPEG-NH2) to obtain good water solubility for MRI-guided photothermal tumor therapy is successfully designed. The mechanism reveals that the enhanced photothermal conversion achieved by BPs-FeSe2-PEG heteronanostructure is attributed to the effective separation of photoinduced carriers. Besides, through the formation of the P-Se bond, the oxidation degree of FeSe2 is weakened. The lone pair electrons on the surface of BPs are occupied, which reduces the exposure of lone pair electrons in air, leading to excellent stability of BPs-FeSe2-PEG. Furthermore, the BPs-FeSe2-PEG heteronanostructure could realize enhanced T2-weighted imaging due to the aggregation of FeSe2 on BPs and the formation of hydrogen bonds, thus providing accurate PTT guidance and generating hyperthermia to inhabit tumor growth under NIR laser with negligible toxicity in vivo.Conclusion sCollectively, this work offers an opportunity for fabricating BPs-based heteronanostructure nanomaterials that could simultaneously enhance photothermal conversion efficiency and photostability to realize MRI-guided cancer therapy.Graphic abstract
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高影响因子
MICROCHEMICAL JOURNAL
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2021
·
IF 4.821
Yeqing Xu,Ting Huang,Bo Hu,Minjia Meng,Yongsheng Yan
Molecular imprinted ratiometric fluorescent analysis method has been a popular method for the quantitative and qualitative tests of target analysis yet encounters low detection efficiency caused by the deep embedment and uneven distribution of fluorescent monomers, even the embedding rate of fluorescent monomer directly affects the visual detection effect. Herein, the ratiometric fluorescent molecularly imprinted polymers (F-PDA/CdTe QDs@SiO 2 @MIPs) based fluorescent polydopamine (F-PDA) and CdTe quantum dots (CdTe QDs) was successfully synthesized to detect p -nitrophenol ( p -NP) selectively and visually. F-PDA was firstly used in the synthesis of ratiometric fluorescent molecularly imprinted polymers to serve as both fluorescent monomer and functional monomer, which greatly shorten the detection time while reducing the fluorescence loss caused by polymer coating. The test results showed that the p -NP quenched the fluorescent of F-PDA via electron transfer. Meanwhile, F-PDA/CdTe QDs@SiO 2 @MIPs enabled to visually detect a low detection limit of p -NP (56.68 nM) within 2.0 min by naked eyes. The detection time was as fast as quantum dots detect targets directly and the detection limit was well below the standard concentration of p -NP in drinking water. Finally, the F-PDA/CdTe QDs@SiO 2 @MIPs realize the detection of p -NP in the drinking and wastewater respectively.
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高影响因子
Science China-Chemistry
·
2019
·Vol. 63
·期 1
·28-34
·
IF 6.085
Zhao Bohang,Huang Yi,Liu Dali,Yu Yifu,Zhang Bin
The development of a facile strategy to construct stable hierarchal porous heterogeneous photocatalysts remains a great challenge for efficient CO 2 reduction. Additionally, hole-trapping sacrificial agents (e.g., triethanolamine, triethylamine, and methanol) are mostly necessary, which produce useless chemicals, and thus cause costs/environmental concerns. Therefore, utilizing oxidation ability of holes to develop an alternative photooxidation reaction to produce value-added chemicals, especially coupled with CO 2 photoreduction, is highly desirable. Here, an in situ partial phosphating method of In 2 O 3 is reported for synthesizing InP–In 2 O 3 p-n junction. A highly selective photooxidation of tetrahydroisoquinoline (THIQ) into value-added dihydroisoquinoline (DHIQ) is to replace the hole driven oxidation of typical sacrificial agents. Meanwhile, the photoelectrons of InP–In 2 O 3 p-n junction can induce the efficient photoreduction of CO 2 to CO with high selectivity and stability. The evolution rates of DHIQ and CO are 2 and 3.8 times higher than those of the corresponding In 2 O 3 n-type precursor, respectively. In situ irradiated X-ray photoelectron spectroscopy and electron spin resonance are utilized to confirm that the direct Z-scheme mechanism of InP–In 2 O 3 p-n junction accelerate the efficient separation of photocarriers.
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高影响因子
APPLIED SURFACE SCIENCE
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2019
·
IF 5.155
Lingjiao Li,Jing Xu
The effect of reaction solvent on the hydrogen evolution activity of novel CoS 2 /FeLaO 3 -4(CS/FLO-4) p-n heterojunction photocatalysts, synthesized using the solvothermal method, was assessed. The highest activity under visible light irradiation was recorded for the CS/FLO-4 catalyst prepared in ethanol. In fact, after 5 h of reaction, the H 2 -yield of the ethanol composite (279.7 μmol) was found to be 5.2 and 150.2 times greater than that of CoS 2 microspheres and FeLaO 3 nanoparticles, respectively. Time-resolved fluorescence (TRF) and photoelectrochemical experiments confirmed the effectiveness of space charge separation in the ethanol catalyst, whereas linear sweep voltammetry results showed that this material is characterized by high current response. The direction of electron migration in the p-n type heterojunction (p-FeLaO 3 /n-CoS 2 ) was found to be the same as that of photoexcited electron transfer (from the conduction band of CoS 2 to the valence band of FeLaO 3 ), which enhances the photocatalytic hydrogen evolution activity of the composite material. This work provides a feasible and simple strategy for the design and synthesis of FeLaO 3 -doped composite catalysts with high photocatalytic activity.
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高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Long Yu,Fei Lu,Xinghao Huang,Yingying Liu,Meiyu Li,Haoze Pan,Leiyu Wu,Yudong Huang,Zhen Hu
Graphene-based coaxial hybrid fibers (CHFs) with a typical core–sheath structure have attracted extensive attention in recent years because of their potentially excellent mechanical performance. However, direct introduction of the micrometer-thick graphene stack structure on the extremely inert fiber surface with little negative effect has barely been reported so far and is still a great challenge. In the present work, a facile and cost-efficient dimensionally confined hydrothermal reduction, static adsorption, and thermal-assisted shrinkage sequential treatment strategy was developed to fabricate one-dimensional CHFs. The large-scale reduced graphene oxide–metal organic framework (RGO–UIO-66) hybrid layer and poly(p-phenylene benzobisoxazole) (PBO) fiber serve as the sheath part and core part, respectively, and the final product is denoted as PGU–CHFs. The experimental results confirmed that the prepared monofilament composite with thermoplastic polyurethane (PGU–CHF–TPU) exhibited an excellent and stable intrinsically self-healing efficiency (about 85%) over 5 cycles and an extraordinary uvioresistant performance (increased by 128%) compared to those of pristine PBO fibers after 288 h UV aging irradiation. Moreover, the anti-ultraviolet (UV) properties of PGU–CHFs at 96 h are basically at the optimum level among most of the reported literatures at present after comparison. The highly near-infrared photothermal conversion ability and stability of micrometer-thick RGO stack structure and the synergism of RGO–UIO-66 hybrid sheath layer including UV adsorption, shielding attenuation, and reflection are responsible for the satisfactorily interfacial self-healing efficiency and UV-resistance properties of PGU–CHFs, respectively. Considering the diversities and versatilities of RGO and MOFs, the proposed fabrication strategy will promisingly endow PBO fibers with great application potential in the other fields such as fiber-based sensors and smart fibers.
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高影响因子
CARBON
·
2019
·
IF 7.466
Lulu Chen,Yelong Zhang,Lile Dong,Xiangjian Liu,Ling Long,Siyu Wang,Changyu Liu,Shaojun Dong,Jianbo Jia
Fabrication of transition metal phosphides/carbon hybrids as electrocatalysts for oxygen reduction reaction (ORR) has great significance for developing clean energy conversion and storage devices based on earth abundant elements. In this work, we prepared 3D N,P-codoped porous carbon supported with ultrasmall Fe 2 P nanoparticles (Fe 2 P/NPC) as high-efficient ORR catalyst by a simple grinding-calcination strategy. As the pore-forming agent, ZnO nanospheres can be in-situ eliminated and generate abundant porous structures which are beneficial to mass transfer. Meanwhile, the large BET surface area (1288 m 2 g −1 ) and pore volume (1.23 cm 3 g −1 ) of Fe 2 P/NPC can provide more contact active centres for ORR. In alkaline solution, Fe 2 P/NPC performs excellent ORR activity with the positive onset potential (0.997 V) and half-wave potential (0.872 V), which are more positive than those of the commercial Pt/C (0.977 and 0.812 V). In addition, Fe 2 P/NPC can be used as air cathode catalyst in a Zn-air battery whose open circuit voltage (1.469 V) is larger than that of the commercial Pt/C (1.332 V) based one. This work provides new strategy to prepare transition metal phosphides/carbon hybrids for electrocatalysis and clean energy conversion systems.
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高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Yu Zhang,Tingting Wang,Yong Wang,Yuanqi Wang,Liqian Wu,Yuan Sun,Xuan Zhou,Wentao Hou,Youwei Du,Wei Zhong
Hollow nano-/micromaterials with tunable shell architectures and compositions are becoming increasingly important and attractive for electrochemical energy conversion and storage. Here, we report carbon-incorporated mixed anionic nickel phosphorus-selenium (Ni 0.85 Se|P) hollow yolk-shell microspheres synthesized by simultaneous selenization and phosphatization of Ni-based metal organic framework (Ni-MOF). Our experimental results indicated that P-doping reduces the synthesis temperature of the system and enhances the crystallinity of Ni 0.85 Se. As a result, this unique structure (Ni 0.85 Se|P) with better crystallinity and higher Ni 2+ /Ni 3+ ratio shows outstanding specific capacity of 506 C g −1 at 1 A g −1 . And the assembled Ni 0.85 Se|P//AC hybrid supercapacitor shows high power density of 20.7 Wh kg −1 at energy density of 798.7 W kg −1 . Meanwhile, Ni 0.85 Se|P exhibits smaller Tafel slope of 90 mV dec −1 and lower onset overpotential of 179 mV versus reversible hydrogen electrode (RHE) for hydrogen evolution reaction (HER) than that of NiP 2 and Ni 0.85 Se, which demonstrates the modulated electronic structure of Ni 0.85 Se|P. Our study will provide a new strategy for combining P-doped induced high crystallinity mixed anion transition metal complexes with MOF of hollow structures for energy storage device and HER.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
·
IF 14.229
Senchuan Huang,Yuying Meng,Yangfei Cao,Shiman He,Xiaohui Li,Shengfu Tong,Mingmei Wu
To realize clean and renewable energy conversion systems, such as fuel cells and water splitting devices, cost-effective and energy-efficient bifunctional metal-free electrocatalysts are highly needed. Herein, N-, O- and P-doped hollow carbons (NOPHCs) are successfully synthesized via pyrolysis of Co 2 P-containing polypyrrole (Co 2 P@PPY) precursors and removal of Co 2 P templates. The materials are proven to serve as efficient and stable metal-free bifunctional electrocatalysts toward hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR) in basic media. Notably, NOPHC 10 -900, which is obtained using 0.10 g of Co 2 P as template and pyrolyzed at 900 °C, exhibits high electrocatalytic performance for HER with a small overpotential of 290 mV at −10 mA cm −2 , a low Tafel slope of 102 mV dec -1 , and a great long-term stability for 19 h. Moreover, it affords decent electrocatalytic performance for ORR, with positive onset potential, high electron-transfer number, good methanol crossover tolerance and outstanding durability. The excellent electrocatalytic performance is mainly due to the synergistic effect of the multi-heteroatoms dopants in it and the large density of active sites on the surface of the hollow carbons.
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高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Pengcheng Du,Yuman Dong,Hongxing Kang,Qi Wang,Jingye Niu
p-Phenylene diamine (PPD) was selected as functional monomer to modify the holey graphene networks (rHGO-PPD) by a facile one-step hydrothermal method . rHGO-PPD was employed as promising active electrode materials to apply in supercapacitors (SCs), which exhibited excellent electrochemical performance, including high specific capacitance (375.5 F/g at current density of 0.5 A/g), excellent rate capability and good cycling stability due to the contribute of pseudocapacitive behavior of PPD. For further pursuit of great value in the practical application, the rHGO-PPD was used to fabricate symmetric SCs and flexible solid-state SCs (FSSCs). The FSSCs possessed high specific capacitance of 332.4 F/g, maintained good cycling stability of 74% of its initial capacitance up to 5000 charge-discharge cycles. In addition, FSSCs also exhibited extraordinary mechanical flexibility, and also maintained excellent stability even in a harsh environment. Remarkably, the FSSCs showed excellent long-term storage stability, and the capacitance kept about 88% after ten weeks of storage. Therefore, the FSSCs based on rHGO-PPD electrode material display promising application in flexible energy-storage devices.
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