JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 16
·9702-9711
·
IF 4.22
Yang Yongmei,Gao Xinna,Yang Sijun,Shen Yuhua,Xie Anjian
Abstract Fabricate surface-enhanced Raman scattering (SERS) substrate with low cost and high performance through simple method is a challenge and worthy of work. Herein, an excellent Cu 2 O SERS substrate with porous octahedron structure was synthesized by brief calcining Cu-MOFs in Ar, air and H 2 /Ar gas environment at 350 °C successively. The as-obtained octahedral Cu 2 O was utilized as SERS substrate to measure dye molecules and organic pollutants, which exhibited splendid sensitivity for the detection of methylene blue and 4-mercaptopyridine (4-MPY) with the ultralow limit of 5 × 10 –9 M and 5 × 10 –10 M, respectively. The maximum relative standard deviation for detection of 4-MPY is as low as 12.3%, which is less than limiting step in quantitative SERS (15.0%). The above excellent results are due to outstanding synergistic effect of electromagnetic enhancement of oxygen vacancy on the Cu 2 O surface and chemical enhancement of the Cu–S bonds formation. The fabricated Cu 2 O possesses superior sensitivity, selectivity and reproducibility for SERS detection of probe molecules with sulfhydryl groups and may be a prospect candidate in the practical application. Graphical Abstract
An excellent Cu 2 O SERS substrate with porous octahedron structure was synthesized by simple calcining Cu-MOFs in Ar, air and H 2 /Ar gas environment at 350 °C successively. The as-prepared Cu 2 O play significant roles in the enhancement of SERS signals for rich-thiol detection due to outstanding synergistic effect of electromagnetic enhancement of oxygen vacancy on the Cu 2 O surface and chemical enhancement of the Cu-S bonds formation. The detection limit of 4-Mercaptopyridine (4-MPY) can be as low as 5×10 –10 M. The porous octahedral Cu 2 O will have potential applications in SERS detection as the substrate.
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高影响因子
JOURNAL OF POROUS MATERIALS
·
2021
·Vol. 28
·期 3
·943-954
·
IF 2.496
Zou Xiuyang,Zhao Yijiang,Li Meisheng,Zhou Shouyong,Chen Chenglung
Graphitic carbon nitride (g-C 3 N 4 ) nanosheets have attracted great attention in the areas of photocatalysis, sensors, energy storages and membrane separations. A three-step exfoliation strategy was designed to use solvent exfoliating g-C 3 N 4 nanosheets from bulk g-C 3 N 4 . In the first stage, bulk g-C 3 N 4 was prepared and then exfoliated into g-C 3 N 4 nanosheets by various solvents. In the second stage, molecular dynamics simulations were carried out and the energy barriers for the exfoliations were determined. Various interactions between solvent molecules and exfoliated nanosheet were analyzed. In the third stage, exfoliation was re-carried out according to the result from MD simulation to obtain optimal amount of exfoliated g-C 3 N 4 nanosheets. The experimental result matched with the simulation prediction very well. In combination with simulation and experiment, a successful way to obtain maximum amount of exfoliated g-C 3 N 4 nanosheet was set up. Then a 5.03 mg/mL g-C 3 N 4 suspension was obtained. Meanwhile, a concept of kinetic energy increment was introduced for the first time to explain the exfoliating efficiency of g-C 3 N 4 nanosheets, which greatly reduced the simulation time by 80% compared with the free energies in terms of the potential of mean force.
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COLLOID AND POLYMER SCIENCE
·
2021
·Vol. 299
·期 6
·1055-1062
·
IF 1.931
LYu Zijian,Wang Fei,Liu Peng,Zhang Kai,Sun Qian,Bai Xiaoyu,Li Aixiang,Song Xinhua
Lutein-b-methoxy polyethylene glycol (Lutein-b-mPEG) encapsulated lutein nanoemulsion was prepared. First, mercapto-terminated mPEG (mPEG-SH) was prepared. Then, vinyl-terminated lutein was prepared by the esterification reaction of lutein and allyl chloroformate. Finally, Lutein-b-mPEG was synthesized by the thiol-ene reaction of the vinyl-terminated intermediate and mPEG-SH. Lutein-b-mPEG was self-assembled in water to form spherical micelles, and the unreacted lutein was directly loaded in the micelles. The synthesis of the block copolymer and loading of unreacted lutein are completed in one pot. The results of IR, 1 H NMR, GPC, and surface tension showed that the Lutein-b-mPEG was prepared. The TEM results showed that Lutein-b-mPEG loaded lutein self-assembled in water to form spherical micelles, and the average size is larger than that of Lutein-b-mPEG micelles. The chemical stability of lutein loaded by Lutein-b-mPEG micelles is greatly enhanced. Moreover, due to the water solubility and micellization of lutein, it is possible to greatly increase its bioavailability.
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BMC Chemistry
·
2021
·Vol. 15
·期 1
·1-9
·
IF 2.61
Chen Lirong,Guo Yuqiu,Li Xiaoyue,Gong Kuijie,Liu Kaichang
The polyphenol distribution in fresh waxy corns of different color varieties and their functional activities, which may be useful for treating various chronic diseases, were investigated. The in vitro antioxidant activity, and hypoglycemic and hypocholesterolemic effects of the free and bound corn phenolics were determined to evaluate the edible value of fresh waxy corn. The colored varieties contained more phenols than the common varieties (white and/or yellow). The total free phenolic acid content of the six varieties was 6637.73 µg/g DW (dry weight), which was slightly higher (P > 0.05) than that of the total bound form (6276.65 µg/g DW). The total free flavonoid content was 5850.09 µg/g DW, which was higher (P < 0.05) than that of the total bound form (4874.51µg/g DW). No bound anthocyanin was detected in the methanol extracts of the tested varieties. For all the varieties, free polyphenols contributed 86−100 % and 70−78 % of the 2, 2-diphenyl-1-picrylhydrazyl (DPPH) and hydroxyl radical scavenging abilities, respectively, and 100 % of the ferric reducing capacity. The free phenolics in fresh waxy corn showed better (P < 0.05) hypoglycemic effect than the bound form in terms of inhibition of α-amylase activity, whereas the bound phenolics of most varieties showed higher α-glucosidase inhibitory activity than the free forms. The free phenolics showed better (P < 0.05) glycocholesterol binding than the bound form for all varieties. The bound polyphenols showed better sodium cholate and taurocholate binding than the free form for most varieties. In conclusion, the difference between free and bound polyphenol content and functional activities indicates that fresh waxy corn can be potentially used for the development of functional food.
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PubMed
高影响因子
Nature Communications
·
2021
·Vol. 12
·期 1
·1-10
·
IF 14.919
Wang Yuyan,Huang Xin,Zhang Xinxing
Self-healing materials integrated with excellent mechanical strength and simultaneously high healing efficiency would be of great use in many fields, however their fabrication has been proven extremely challenging. Here, inspired by biological cartilage, we present an ultrarobust self-healing material by incorporating high density noncovalent bonds at the interfaces between the dentritic tannic acid-modified tungsten disulfide nanosheets and polyurethane matrix to collectively produce a strong interfacial interaction. The resultant nanocomposite material with interwoven network shows excellent tensile strength (52.3 MPa), high toughness (282.7 MJ m ‒3 , which is 1.6 times higher than spider silk and 9.4 times higher than metallic aluminum), high stretchability (1020.8%) and excellent healing efficiency (80–100%), which overturns the previous understanding of traditional noncovalent bonding self-healing materials where high mechanical robustness and healing ability are mutually exclusive. Moreover, the interfacical supramolecular crosslinking structure enables the functional-healing ability of the resultant flexible smart actuation devices. This work opens an avenue toward the development of ultrarobust self-healing materials for various flexible functional devices.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 29
·期 12
·17964-17976
·
IF 4.223
Chen Heng,Liu Fengjun,Cai Chenjian,Wu Hao,Yang Linjun
A novel adsorbent consisting of tannic acid (TA) immobilized on graphene oxide (GO) was proposed and used to remove Hg 2+ from desulfurization wastewater. The morphology and physicochemical properties of tannin-immobilized graphene oxide (TAIGO) were characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The characterization results showed that TA was successfully immobilized on GO, and that new functional groups were introduced on TAIGO. The effects of contact time, adsorbent dose, pH, and ion components on removal efficiency were evaluated. The adsorption process was found to be complete within 15 min, and the removal efficiency increased with increasing adsorbent dosage. The pH value affected the protonation of TAIGO and the form of Hg 2+ in wastewater. High concentrations of Cl − and SO 3 2− hindered the adsorption performance, whereas SO 4 2− and cations had a negligible effect. In addition, the excellent economic benefits of TAIGO were analyzed in an economic evaluation, and the Hg 2+ removal efficiency remained at 88% after three recycles. A pseudo-second-order kinetic model ( R = 0.9995) was used to fit the adsorption process, and the oxygen-containing functional groups and chelation reaction played critical roles in adsorption. TAIGO is a low-cost adsorbent with high Hg 2+ removal efficiency and could be further used in practical desulfurization wastewater. Graphical abstract
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高影响因子
JOURNAL OF POROUS MATERIALS
·
2021
·Vol. 29
·期 1
·241-247
·
IF 2.496
Lu Jun,Cui Chaofan,Yu Qihao,Su Juanjuan,Han Jian
Oily wastewater is an urgent issue that threatens the ecosystem and human health. Superhydrophobic porous materials are widely concerned as promising candidates for effective oil/water separation and oil adsorption. However, superhydrophobic porous materials are still confronted with frustrations such as complex preparation processes and secondary pollution to the environment. Superhydrophobic porous materials with biodegradability and a relatively simple preparation process are more attractive to practical application and environmental protection. In this work, biodegradable and industrially applied polylactic acid (PLA) nonwoven materials were used as porous membranes, then PLA nanoparticles were loaded on the membrane surface to construct the hierarchical rough structure. The modified PLA nonwoven membrane (nano-PLA) shows superhydrophobicity and efficient oil/water separation performance. Moreover, strong mechanical strength and acceptable toughness are obtained. This work offers an easily controlled and industrially used pathway for the design of robust, highly selective, and biodegradable oil/water separation materials.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 23
·27871-27881
·
IF 2.478
Zhang Hongda,Zhou Hong,Liu Guolong,Ge Jing,Jin Liguo
The hybrid fillers (Al 2 O 3 –ATP hybrids) composed of two types of inorganic materials—modified alumina (Al 2 O 3 ) and modified attapulgite (ATP)—were principally prepared, following which the epoxy matrix (EP) composites reinforced with Al 2 O 3 –ATP hybrids were synthesized. The mechanical and dynamic mechanical properties of fabricated Al 2 O 3 –ATP/EP composites are enhanced by doping Al 2 O 3 –ATP hybrids into EP. The highest impact and flexural strength of EP composites (3 wt% Al 2 O 3 –3 wt% ATP/EP) are improved to 27.88 kJ/m 2 and 157.04 MPa, which are 457.6% and 89.2% higher than those of the pure epoxy resin, respectively. The glass transition temperature of Al 2 O 3 –ATP/EP composites increases by 8.8 °C, compared with pure EP composites and the dielectric constant and dielectric loss can reach 3.19 and 0.0041 at 100 Hz. These excellent mechanical and dynamic mechanical properties, accompanied by dielectric property may expand the practical applications of EP composites in industrial engineering.
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Advanced Fiber Materials
·
2021
·Vol. 3
·期 6
·349-358
·
IF 0
Yu Miao,Tian Qihang,He Guangyuan,Cui Kaimin,Zhang Jihong
Surface-enhanced Raman scattering (SERS) provides a novel method for low concentration molecular detection. The performances were highly dependent on the sizes, geometries and distributions of metal nanostructures. Here, highly sensitive SERS fiber probe based on silver nanocubes (Ag NCs) was fabricated, by assembled nanostructures on planar and tapered fiber tips. Ag NCs were synthesized by polyol method, and controlled by reductant content, reaction temperatures and crystal growth durations. Tapered fibers with different cone angles were prepared by chemical etching. The electromagnetic distribution simulation indicated that nanocubes had stronger electric field between two cubes and vertex corners than nanosphere, under 532 nm laser excitation. The intensity could reach 53.52 V/m, for cubes with 70 nm edge length. The SERS performance of probes was characterized using crystal violet analyte. The detectable lowest concentration could reach 10 –9 and 10 –10 M for planar and tapered fiber probes, respectively. The corresponding enhancement factor could be 9.02 × 10 7 and 6.22 × 10 8 . The relationship between SERS peak intensities and analyte concentrations showed well linear, which indicated both fiber probes could be applied for both qualitative and quantitative analysis. Furthermore, optimal cone angle of tapered fiber SERS probe was 8.3°. The tapered fiber SERS probes have highly sensitive activity and great potential in substance detection. Graphic abstract
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JOURNAL OF POLYMER RESEARCH
·
2021
·Vol. 28
·期 11
·1-13
·
IF 3.097
Yang Mingcheng,Guo Wenhui,Liu Shubo,Zhang Benshang,Chen Yang,Wang Yun
The development of facile and cost-effective strategies for hydrogels with multifunctionality is of great scientific interest. In this work, a series of poly (vinyl alcohol)/tannic acid (PVA/TA) composite hydrogels were facilely prepared by gamma radiation of a PVA solution and subsequent soaking treatment in TA solutions. The chemical composition, transparency, microstructure, mechanical property and antibacterial activity of the resulting composite hydrogels were characterized by Fourier Transform Infrared Spectroscopy (FT-IR), UV-Vis spectroscopy, SEM, tensile measurements and an antibacterial test, respectively. The introduction of TA into the gamma radiation-induced chemically cross-linked networks of PVA hydrogels via the soaking treatment, which forms the second physically cross-linked networks, endows the PVA hydrogels with improved mechanical performance. The tensile strength, toughness and elongation at break of the composite hydrogel were increased by 1500 % (from 18 kPa to 254 kPa), 3600 % (from 8.5 kJ m −3 to 315 kJ m −3 ) and 360 % (from 87 to 403 %), respectively. Meanwhile, high transparency of the neat irradiated PVA hydrogels was maintained in the obtained composite hydrogels (transmittance over 60 % at 660 nm). The strong hydrogen bonding interaction between PVA and TA within the networks serves as sacrificial bonds and suppresses the crystallinity of the PVA hydrogels. In addition, the composite hydrogels also possess superior antibacterial activity against both gram-negative and gram-positive bacteria. This work provided a simple approach for the construction of multifunctional hydrogels on large-scale preparation, thus would hopefully promote their applications in biomedicine, wound dressings and soft devices.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 29
·期 10
·13893-13904
·
IF 4.223
Wang He,Liu Congzhi,Ma Xiaofei,Wang Yong
In this work, polymers containing a large number of benzene rings and multiple functional groups were designed to remove aromatic organic pollutants. Using tetrafluoroterephthalonitrile (TFTPN) as a rigid crosslinking agent to crosslink different functionalized phenylcarbamoylated-β-cyclodextrin derivatives to prepare a series of porous multifunctional cyclodextrin (CD) polymerizations, including three preliminary polymerized adsorption materials and a mix β-cyclodextrin polymer (X-CDP) prepared via a secondary crosslinking procedure of the above three materials. The X-CDP preparation process connects the pre-formed nanoparticles and increases the presence of linkers inside the particles. At the same time, X-CDP exhibited porous structure with various functional groups such as nitro, chlorine, fluorine, and hydroxyl. Those special characteristics render this material with good adsorption ability towards various aromatic organic pollutants in water, including tetracycline, ibuprofen, dichlorophenol, norfloxacin, bisphenol A, and naphthol. Especially, the maximum adsorption capacity for tetracycline at equilibrium reached 110.56 mg·g −1 , which is competitive with the adsorption capacities of other polysaccharide adsorbents. X-CDP removed organic contaminants much more quickly than other adsorbents, reaching almost ~95% of its equilibrium in only 30 s, and the rate constant reaches 2.32 g·mg −1 ·min −1 . The main adsorption process of the pollutants by X-CDP fitted the pseudo-second-order kinetic and Langmuir isotherm well, indicating that the adsorption process is monolayer adsorption. Moreover, X-CDP possessed the good reusability where the pollutant removal rate was only reduced 8.3% after five cycles. Such advantages render the polymer great potential in the rapid treatment of organic pollutants in water bodies.
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高影响因子
COLLOID AND POLYMER SCIENCE
·
2021
·Vol. 299
·期 11
·1797-1805
·
IF 1.931
Li Saiyao,Wang Yang,Li Ting,Ma Piming,Zhang Xuhui,Xia Bihua,Chen Mingqing,Du Mingliang,Dong Weifu
Organic filters in traditional sunscreens usually are limited photodegradation and easily penetrate the stratum corneum and epidermal layer, leading to potential harmful effects. Melanin is a natural ubiquitous pigment that protects living organisms from intense sunlight. Inspired by the structure and function of the mussel adhesive protein, a facile strategy involving oxidative polymerization of dopamine was proposed for surface modification of titanium dioxide (TiO 2 ) to obtain melanin/TiO 2 nanoparticles. The thickness of melanin layers was varied from 1 to 7 nm by changing pH and dopamine concentration. The melanin/TiO 2 nanoparticles with 1-nm-thick melanin layers showed highly efficient UV-shielding ability due to synergistic effect of melanin and TiO 2 . The melanin/TiO 2 nanoparticles were introduced as the sole active ingredient to formulating sunscreen; sun protection factor (SPF) could reach 116.9 and 162.4 with a loading of 10 wt% and 15 wt%, respectively. Most importantly, melanin exhibits a good bioadhesion property and can effectively prevent the penetration of melanin/TiO 2 nanoparticles. Thus, the as-prepared nanoparticles possess excellent UV-shielding capacity and biocompatibility, ensuring their superior performance and safe use in the sunscreen. Graphical abstract Inspired by the structure and function of the mussel adhesive protein, a facile strategy involving oxidative polymerization of dopamine was proposed for surface modification of titanium dioxide (TiO 2 ) to obtain melanin/TiO 2 nanoparticles. The melanin/TiO 2 nanoparticles with 1-nm-thick melanin layers showed highly efficient UV-shielding ability due to synergistic effect of melanin and TiO 2 . Most importantly, melanin exhibits a good bioadhesion property and can effectively prevent the penetration of melanin/TiO 2 nanoparticles. Thus, the as-prepared nanoparticles possess excellent UV-shielding capacity and biocompatibility, ensuring their superior performance and safe use in the sunscreen.
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危险品化学品经营许可证（带存储）