RSC Advances
·
2020
·Vol. 10
·期 45
·27173-27182
·
IF 3.119
Yinghui Wang,Simin Wei,Kang Wang,Zhe Wang,Jinwei Duan,Lin Cui,Huayu Zheng,Ying Wang,Shanshan Wang
Since silver nanoparticles (AgNPs) synthesized by using plant extracts revealed varied biological activities, the green synthesis of AgNPs has attracted considerable attention. Although the green synthesis of AgNPs have been accomplished by using the extracts of Cornus Officinalis, which is a traditional Chinese medicine and exhibits a wide spectrum of phytochemicals. The effects of biosynthesis parameters on reducing reaction, stability and more broad biological activities of so-prepared AgNPs did not been evaluated. In this paper, we firstly assessed the effects of UV radiation, pH, material proportion and radiation times on the green synthesis of AgNPs under 365 nm UV radiation by UV-visible spectrum and dynamic light scattering (DLS) analysis. The results showed that UV radiation could accelerate the formation of AgNPs and influence the average size below pH 7.0, and the size of so-prepared AgNPs were sensitive to the pH and material proportion, but no obvious changes to UV radiation times, offering a size-controlled synthetic method for AgNPs. The further X-ray diffraction (XRD), transmission electron microscopy (TEM) and DLS studies showed AgNPs synthesized at pH 7.0, extract: AgNO3 = 1 : 1 and after 4 h UV radiation were a face-centered cubic (fcc) structure and both spherical and polygonal in shape with average particle size of 64.5 ± 0.3 nm existed in a monodispersed form. Subsquently, the stability of AgNPs was analyzed by zeta potential (−24.8 mV) and the average size measurement after 30 days storage (63.3 ± 0.4 nm), revealing a high degree of stability. Lastly, the investigation of biological activities showed that the biosynthesized AgNPs had potent antioxidant activity, antimicrobial activity against both S. aureus and E. coli as well as anticancer activity against HCT116 and HepG2 cell lines but negligible cytotoxicity against SW620. And the internalization of biosynthesized AgNPs inside the bacterial cell was evaluated by flow cytometric analysis, where the SSC values have significant increase after treating with nanoparticles. These results confirmed that the biosynthesis parameters on the green synthesis of AgNPs by using Cornus Officinalis extract also played pivotal roles and so-prepared AgNPs would be useful for the development of new alternative antioxidant, antimicrobial and anticancer agents in biomedicine.
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PubMed
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 41
·14217-14225
·
IF 6.4
Potao Sun,Zeyan Shi,Wenxia Sima,Xinyu Tang,Tao Yuan,Ming Yang,Hang Xu,Zhaoping Li
Microscale damage, including cracks and electrical trees, is inevitably generated in the polymer insulation materials used in the packaging of power equipment and power electronic devices during long-term operation, which leads to premature insulation failure or even widespread power outages. Self-healing insulation materials are the most promising way to solve this problem. However, the mechanical/electrical strength or the dimensional stability of the materials could be sacrificed during the repair process, which has limited their application as insulation materials. In this study, we report an intrinsic self-healing epoxy resin based on reversible anthracene photodimerization (ISEP-RAP) that remains mechanically robust while ensuring efficient healing via a reversible reaction. The damaged area is decrosslinked by 254 nm UV and thermal excitation, which accelerates the molecular chain diffusion to the damaged area to fill and repair the damaged channels. The ISEP-RAP is recrosslinked by 365 nm UV to restore the mechanical and electrical properties after self-healing. Due to the combined action of the epoxy-amine permanent crosslinking sites and the anthracene reversible crosslinking sites, high crosslinked ISEP-RAP possesses excellent tensile and dielectric strength similar to that of standard epoxy resin and a lower permittivity constant. Importantly, the decrosslinked ISEP-RAP still possesses sufficiently high strength to keep the macrostructure unchanged. ISEP-RAP achieves high-efficiency, repeatable, non-contact intrinsic self-healing of scratches and electrical trees with whole-process dimensional stability. This work provides a new method for intrinsic self-healing in mechanically robust insulation materials to eliminate microdamage with repeatability, high reliability, and high efficiency.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Deyu Niu,Wenhao Yu,Weijun Yang,Pengwu Xu,Tianxi Liu,Zhenyu Wang,Xiuping Yan,Piming Ma
Poly(lactic acid) (PLA) is one of the most promising sustainable bioplastics for its superior processibility and mechanical strength. However, the inherent flammability and poor UV shielding severely inhibit its widespread application. Traditional solutions usually require a high content of additives, which results in the sacrifice of mechanical properties. In this work, we propose an efficient strategy to overcome these challenges by incorporating epoxy-functionalized hexa -cyclotriphosphazene (HCCP-HEP) and diphenylphosphinyl chloride modified lignin (Lignin(P)) into PLA. The synergistic effect of HCCP-HEP and Lignin(P) through free radical quenching, non-flammable gas dilution and charring promotion significantly impedes combustion and enhances the flame retardance of PLA/HCCP-HEP/Lignin(P) (PLA/H/L) composites. Consequently, the PLA/H/L composite with 1 wt% HCCP-HEP and 1 wt% Lignin(P) loading exhibits a limiting oxygen index of 28.3 % and achieves UL-94 V-0 rating. Moreover, the composite provides over 97 % shielding against UV-A and UV-B radiation with an increased ultraviolet protection factor (UPF) from 1 to 700, while maintaining superior tensile strength (59 MPa). This work presents a new approach to prepare high-performance and multi-functional PLA composites, which is expected to broaden the application of PLA.
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Food Analytical Methods
·
2021
·Vol. 14
·期 7
·1345-1358
·
IF 3.366
Wei Yihua,Zhang Jinyan,Qiu Shuyan,Huang Qingqing,Yuan Linfeng,Chen Liumeng,Dai Tingcan,Tu Tianhua,Zhang Biaojin,Yan Han,Li Weihong
A simple, rapid, and accurate method for determination of selenocystine (SeCys 2 ), methyl selenocysteine (MeSeCys), selenourea (SeUr), selenite (Se(IV)), selenotmethionine (SeMet), and selenate (Se(VI)) in grain crops was developed, based on the coupling of ion-pair reversed-phase high-performance liquid chromatography (IP-RP-HPLC) and ultraviolet irradiation hydride generation atomic fluorescence spectrometry (UV-HG-AFS). The conditions of IP-RP-HPLC-UV-HG -AFS were studied. The conditions of the pretreatment sample, such as types and dosage of proteinases, were investigated. The detection limits (LODs) for six Se species were between 0.77 and 1.77 μg·L −1 . Then, the proposed method has been successfully used to analyze selenium (Se) species in Se-enriched rice paddy ( Oryza sativa L. ), soybean ( Glycine max (Linn.) Merr. ), and sweet potato ( Ipomoea batatas (L.) Lam. ) with foliar application of sodium selenite solution. SeMet was the major Se spices in Se-enriched grain crops, ranged from 77–90% of the total Se contents. The capabilities of Se enrichment were relatively larger differences in three-grain corps as follows: soybean > rice paddy > sweet potato.
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高影响因子
COMPOSITE INTERFACES
·
2021
·
IF 2.952
Bin Xu,Chenghua Chen,Enpei Ma,Zhenghuang Wei,Xiaoqing Li
In this study, SiO2/polymer co-coated colored aluminum pigment was prepared by sol-gel method and atom transfer radical polymerization technique. The results of scanning electron microscope (SEM) and transmission electron microscope (TEM) analysis showed that there was a coating layer with the thickness of about 500 nm on the surface of the pigment. X-ray diffraction (XRD) and fourier transform infrared spectroscopy (FT-IR) analysis revealed that the coating layer of the pigment contained SiO2 and polymer of 2-(Dimethylamino)ethyl methacrylate (DMAEMA), indicated that SiO2 and the polymer were successfully coated on the surface of the aluminum powder. Moreover, the co-coated layer of SiO2 and the polymer can effectively prevent the contact between the aluminum powder and the corrosive medium, thereby exhibiting excellent corrosion resistance. In addition, the prepared pigment was made into a pigment paste in a certain ratio and uniformly coated on a polyester fabric, its UPF value was 93.03, which revealed that the coated fabric has excellent ultraviolet protection properties.
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2021
·
IF 5.645
Caihong Li,Yan Zhao,Wenjing Li,Rongrong Xing,Jing Lu,Rongxia Liu
Euodiae Fructus (EF, the fruit of Tetradium ruticarpum ) belongs to the family Rutaceae which has a complex genetic background, making classification a challenge. In order to classify the three closely related cultivars (small flower EF, medium flower EF, and big flower EF) and simplify the identification procedure in the future, an approach integrating ultra-high performance liquid chromatography-ultraviolet spectrum-hybrid quadrupole-Orbitrap high resolution mass spectrometry (UHPLC-UV-Q-Orbitrap HRMS) with machine learning algorithms was developed. Orthogonal partial least squares-discriminant analysis (OPLS-DA) and random forest (RF) were used to assort the processed EF products and select the chemical markers to differentiate among the three EF cultivars, respectively. Then the thresholds of classification were determined using the eXtreme Gradient Boosting (XGboost) model based on the quantitative data of chemical markers by the UHPLC-Q-Orbitrap HRMS. The results demonstrated that the approach successfully discriminated among three closely related cultivars of EF, and five chemical markers (neochlorogenic acid, (+)-catechin, chlorogenic acid, dehydroevodiamine, and limonin) were selected. Thresholds were obtained to classify the three cultivars. If the content of neochlorogenic acid was greater than 7.52 mg/g, the sample belonged to small flower EF, otherwise, it belonged to medium flower EF or big flower EF. Furthermore, if the content of dehydroevodiamine was greater than 3.84 mg/g, the sample was medium flower EF, otherwise, it was big flower EF. In general, this research provides a novel strategy for the discrimination of Euodiae Fructus cultivars to avoid misapplication and possible side effects.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Han Chen,Tao Lin,Shisheng Zhang,Hang Xu,Hui Tao,Wei Chen
The application of the integrated Fe II /EDDS/UV/PAA (FEUP) process (EDDS = ethylenediamine- N,N’ -disuccinic acid; PAA = peracetic acid) as a novel advanced oxidation process (AOP) for the degradation of a model contaminant, namely, naproxen (NAP), at neutral pH was investigated. The enhanced NAP degradation in this system at pH 7 was primarily attributable to the continuous activation of PAA via the UV-assisted Fe II /Fe III cycle. A four-phase conceptual process of NAP degradation was established. The instantaneous degradation stage (IDS), in which Fe II and PAA instantaneous react within 1 s, resulted in the degradation of ~ 20% of NAP. The rapid degradation stage (RDS), in which the regenerated Fe II rapidly activates PAA to produce the hydroxyl radicals (•OH) and organic radicals including CH 3 C(O)O•, CH 3 C(O)OO•, CH 3 OO• and •CH 3 (defined as R-C•) without being scavenged by the Fe II /Fe III -EDDS complexes, contributed to the degradation of ~ 55% of NAP. The slow degradation stage (SDS), during which Fe II /Fe III -EDDS complexes started competing for radicals, and resulted in the degradation of ~ 15% of NAP. The continuous degradation stage (CDS), in which hydrogen peroxide (H 2 O 2 ) was the only oxidant because PAA was exhausted, corresponded to the degradation of another ~ 10% of NAP. The effect of water matrices including Cl - /Br - , HCO 3 – /CO 3 2– , and humic acid (HA) was evaluated: Br - , HCO 3 – /CO 3 2– , and HA exhibited an inhibiting effect on NAP degradation, while Cl - showed no influence on NAP degradation in the FEUP process. A superior degradation performance was achieved under a low Fe II dosage and neutral conditions, demonstrating the great potential of the FEUP process for practical applications.
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Science China-Technological Sciences
·
2020
·Vol. 64
·期 4
·785-792
·
IF 2.302
Ge Bo,Zhang YuLing,Zhang TingXiao,Ren GuiNa,Li WenZhi,Zhao Hui
Various forms of pollutants discharged from industrial and life; how to treat the opposite water-soluble pollutants at the same time is a challenge. Here, a superhydrophobic BiOBr/Ag 3 PO 4 fabric (SH fabric) bulk material was prepared aiming at the diversity of pollutants. Water (WCA=160°) and oil contaminants (spread) have different wetting behavior on fabric surfaces. The high recovery efficiency for oil pollutants was achieved by using the selective oil removal property of the SH fabric. Meanwhile, the pollutants in the aqueous phase were removed by photocatalyst after oil/water separation. Mechanism analysis demonstrated that the direct Z-type heterojunction formed between BiOBr ( E VB =1.66 eV; E CB =−1.08 eV) and Ag 3 PO 4 ( E VB =3.03 eV; E CB = 0.6 eV). It is worth noting that the SH fabric exhibited good mechanical stability and UV shielding performance, which have potential application in environmental control.
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高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 39
·13612-13620
·
IF 7.059
Majid Basharat,Yasir Abbas,Djebar Hadji,Zahid Ali,Shuangkun Zhang,Hanlin Ma,Zhanpeng Wu,Wei Liu
Covalent inorganic–organic hybrid frameworks (CIOFs) composed of inorganic heterocycles covalently linked to organic building blocks are a relatively unexplored and fertile area of research compared to the covalent organic frameworks. Herein, we report the selective light responsive CIOFs prepared by considering energy gaps (Egs) of the inorganic heterocycle (P3N3Cl6) (Eg 5.745 eV), organic building block (4,4-sulfonyldiphenol) (Eg 4.05 eV), and triazine heterocycle (1,3,5-triazine-2,4,6-triamine) (Eg 4.79 eV) under mild reaction conditions (by P–O–C and P–NH–C bond formation). The morphology of CIOF-I (prepared from hexachlorocyclotriphosphazene and 4,4-sulfonyldiphenol) is micro-spherical (diameter, ca. 0.6–1 μm), whereas that of CIOF-II (prepared from hexachlorocyclotriphosphazene and 1,3,5-triazine-2,4,6-triamine) is micro-spherical (diameter, ca. 0.5–1 μm) as well as tubular. The X-ray diffraction (XRD) analysis showed that these CIOFs are amorphous in nature. The luminescence studies of both CIOFs have shown a selective response to different lights; when excited under UV light at a wavelength of 365 nm, the CIOFs showed cyan emission, while under visible region 420 nm and 546 nm excitations, the emission shifts to green and red, respectively. CIOF-I demonstrated maximum emission at 454 nm (Ex. 365 nm), 487 nm (Ex. 420 nm), and 708 nm (Ex. 546 nm), while CIOF-II exhibited maximum emission at 460 nm (Ex. 365 nm), 478 nm (Ex. 420 nm), and 604 nm (Ex. 546 nm). The density functional theory (DFT) studies were performed based on Gaussian 09 (B3LYP/6-311+G (d,p)) for the core structure of CIOFs’ HOMO and LUMO levels (CIOF-I −6.54 eV, −2.62 eV and CIOF-II −6.44 eV, −2.55 eV), and Egs (3.92 eV and 3.84 eV) which are in good agreement with the experimental values. The mechanism behind the demonstration of similar emission colors by two different chemical structures is also underpinned. The selective response towards different lights is ascribed to the aggregation/clustering-induced/triggered emission (AIE/CTE) and restricted rotation emission (RRE) due to the crosslinking of the wider energy gap inorganic heterocycle and organic linkers. This study may grab the attention of researchers to study the inorganic heterocycle centered selective light responsive materials due to their extensive application prospects.
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Materials
·
2020
·Vol. 13
·期 6
·1388
·
IF 3.057
Jianping Zhou,Chunfang Zhu,Hongbo Liang,Zhengyue Wang,Hailong Wang
Low surface energy coatings have gained considerable attention due to their superior surface hydrophobic properties. However, their abrasion resistance and sustainability of surface hydrophobicity are still not very satisfactory and need to be improved. In this work, a series of utraviolet (UV)-curable fluorosiloxane copolymers were synthesized and used as reactive additives to prepare polyurethane acrylate coatings with low surface energy. The effect of the addition of the fluorinated graft copolymers on the mechanical durability and surface hydrophobicity of the UV-cured hybrid films during the friction-annealing treatment cycles was investigated. The results show that introducing fluorosiloxane additives can greatly enhance surface hydrophobicity of the hybrid film. With addition of 2 wt.% fluorosiloxane copolymers, the water contact angle (WCA) value of the hybrid film was almost tripled compared to that of the pristine PU film, increasing from 58° to 144°. The hybrid film also showed enhanced abrasion resistance and could withstand up to about 60 times of friction under a pressure of 20 kPa. The microstructure formed in the annealed film was found to contribute much to achieve better surface hydrophobicity. The polyurethane acrylate/fluorinated siloxane resin hybrid film prepared in this study exhibits excellent potential for applications in the low surface energy field.Keywords:fluorosiloxane resin;UV curable;low surface energy;polyurethane acrylate
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高影响因子
PROGRESS IN ORGANIC COATINGS
·
2020
·
IF 4.469
Xiaowen Li,Zhu Liu,Peng Hong,Lijuan Chen,Xiaoxuan Liu
The combination of organic and inorganic components has become an challenging for the generation of new materials with preeminent properties over pure constituents. In the present work, a novel hybrid photoinitiator for free radical photopolymerization, belonging to the thioxanthone derivatives, was obtained via chemical joint between silica and 2-chlorothioxanthone (CTX) under a mild preparation condition. This multifunctional supported photoinitiator (silica-s-CTX) can not only initiate the photopolymerization with higher efficiency than traditional photoinitiator CTX, but also prominently improve the dispersion of nanoparticles in the epoxy acrylates resin which brings to the preeminent mechanical properties of UV-cured coatings. Importantly, the amount of residual-free PIs in silica-s-CTX curing system shows a significant decrease comparing with the filled and unfilled CTX curing system. After endowing the silica nanoparticles with photo-initiated performance, it may offer new scientific and technological opportunities for the preparation of high performance UV-curing coatings.
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2021
·Vol. 23
·期 8
·1-12
·
IF 2.253
Tan Liqiang,Liu Zhengjie,Zhou Chuyun,Ding Lu
The environmental behavior and ultimate fate of the engineered nanoparticles could inevitably be affected by the widespread dissolved organic matter and sunlight irradiation in the natural environment. In this study, an analysis combined with experimental investigations was used to explore the influence of humic acid (HA) and UV irradiation on the changes in surface charge and aggregation behavior of TiO 2 nanoparticles. A prolonged UV irradiation caused the point of zero charge (PZC) of TiO 2 nanoparticles shifted to lower values and the aggregate size reached to a maximum value at the PZC. TEM image and FT-IR spectroscopy analysis confirmed the formation of TiO 2 cluster aggregates and successive growth of the hydroxyl groups on different sites on TiO 2 surface, respectively, although no effect of irradiation on the phase transformation of TiO 2 nanoparticles was observed through the use of Raman spectroscopy. The fluorescence spectroscopy analysis illustrated the interactions between the surface hydroxyls formed during UV irradiation on TiO 2 surface and functional groups on HA molecules, which accelerated the aggregation process of TiO 2 nanoparticles. Widespread HA and UV irradiation in the natural environment significantly altered the surface properties and stability of the nanoparticles in aqueous environments. Graphical abstract
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危险品化学品经营许可证（带存储）