COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Jing Wang,Xue Fang,Guangjin Yu,Tianzhi Luo,Yunqi Xu,Chunyan Xu,Ken Cham-Fai Leung,Ailing Hui,Shouhu Xuan,Qunling Fang
Nanoplatforms have been considered as an effective strategy to address the resistance problem of traditional antimicrobial agents. This work reports a magnetic Fe 3 O 4 @AgAu@PDA (Fe 3 O 4 @AgAu@Polydopamine) antibacterial nanomaterial which possesses magnetically induced force-thermal coupling antibacterial effect . The polydopamine shell has good biocompatibility and the AgAu nanorods immobilized on the surface of the magnetic nanospindle not only create a rough surface for the anisotropic nanospindle but also endow it with high photothermal performance and oxidase-like/peroxide-like activities. Besides the original Ag ions release antibacterial activity, Fe 3 O 4 @AgAu@PDA nanospindles (80 μg/mL) also exhibit a good photothermal antibacterial effect (>90%) against Escherichia coli and Staphylococcus aureus under near - infrared (NIR) irradiation. Interestingly, when a rotating magnetic field (RMF) is applied, the antibacterial activity of the magnetic nanospindles can be further increased to nearly 100%. More importantly, in comparison to the Fe 3 O 4 @AgAu@PDA nanospheres , the Fe 3 O 4 @AgAu@PDA nanospindles exhibit a better antibacterial effect. By exploring the interaction between different particles and bacteria under magnetic field conditions, the basic mechanism of force-thermal coupling antibacterial was deeply explored and extended to biofilm removal. The results of cytotoxicity assay show that Fe 3 O 4 @AgAu@PDA nanospindles have good biocompatibility. Thus, the proposed strategy provides broad promise in antimicrobial therapy and biomedicine.
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CHEMISTRY OF MATERIALS
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2015
·
IF 8.354
Siwei Yang,Jing Sun,Peng He,Xinxia Deng,Zhongyang Wang,Chenyao Hu,Guqiao Ding,Xiaoming Xie
A new reversible fluorescent switch for the detection of oxidative hydroxyl radical (•OH) and reductive glutathione (GSH) was designed based on the use of selenium doped graphene quantum dots (Se-GQDs). The Se-GQDs have a thickness of 1–3 atomic layers, a lateral size of 1–5 nm, a quantum yield of 0.29, and a photoluminescence lifetime of 3.44 ns, which ensured a high selectivity and stability for the fluorescent switch. The fluorescence of Se-GQDs was reversibly quenched and recovered by •OH and GSH, respectively, because of the reversible oxidation of C–Se groups and reduction of Se–Se groups. This brand-new GQD-based fluorescent switch gave a rapid response when tested in both aqueous solutions and living HeLa cells. In particular, the detection limit for •OH was only 0.3 nM, which was much lower than that in switches made from organic dyes.
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Materials
·
2023
·Vol. 16
·期 23
·7504
·
IF 3.4
Zeliang Guan,Ling Bai,Binyang Du
With the development of mobile electronic devices, there are more and more requirements for high-energy storage equipment. Traditional lithium-ion batteries, like lithium–iron phosphate batteries, are limited by their theoretical specific capacities and might not meet the requirements for high energy density in the future. Lithium–sulfur batteries (LSBs) might be ideal next-generation energy storage devices because they have nearly 10 times the theoretical specific capacities of lithium-ion batteries. However, the severe capacity decay of LSBs limits their application, especially at high currents. In this study, an ionic liquid (IL) electrolyte additive, TDA+TFSI, was reported. When 5% of the TDA+TFSI additive was added to a traditional ether-based organic electrolyte, the cycling performance of the LSBs was significantly improved compared with that of the LSBs with the pure traditional organic electrolyte. At a rate of 0.5 C, the discharge specific capacity in the first cycle of the LSBs with the 5% TDA+TFSI electrolyte additive was 1167 mAh g−1; the residual specific capacities after 100 cycles and 300 cycles were 579 mAh g−1and 523 mAh g−1, respectively; and the average capacity decay rate per cycle was only 0.18% in 300 cycles. Moreover, the electrolyte with the TDA+TFSI additive had more obvious advantages than the pure organic ether-based electrolyte at high charge and discharge currents of 1.0 C. The residual discharge specific capacities were 428 mAh g−1after 100 cycles and 399 mAh g−1after 250 cycles, which were 13% higher than those of the LSBs without the TDA+TFSI additive. At the same time, the Coulombic efficiencies of the LSBs using the TDA+TFSI electrolyte additive were more stable than those of the LSBs using the traditional organic ether-based electrolyte. The results showed that the LSBs with the TDA+TFSI electrolyte additive formed a denser and more uniform solid electrolyte interface (SEI) film during cycling, which improved the stability of the electrochemical reaction.Keywords:lithium–sulfur battery;ionic liquid;electrolyte;additive
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Environmental Science-Processes & Impacts
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2023
·Vol. 25
·期 12
·1962-1973
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IF 5.5
Jine Wang,Chen Zhang,Rui Zhao,Pei Wang,Meihua Jin,Jiujun Xu
Marine biofouling is a thorny issue that causes serious economic losses and adverse ecological impacts on marine ecosystems. Effective and promising antifouling strategies such as surface hydration, flow shear force, and lubricant injection have been developed to address this challenge. However, for the complex marine environment, they still appear inadequate. Mussels are a common fouling organism with strong surface adhesion ability. However, when hypoxia and the oxidative cross-linking reaction of 3,4-dihydroxy phenyl-L-alanine (DOPA) in the structure of adhesion proteins are disrupted, their adhesion ability will be greatly reduced. Inspired by this, we developed an effective antifouling strategy based on reactive oxygen species (ROS) scavenging using N-acetylcysteine (NAC) and evaluated its performance. As a ROS scavenger interfered with the oxidative cross-linking reaction of DOPA in an aqueous solution, the adhesion of DOPA was also affected on the surface of NAC functionalized polyvinyl chloride (PVC) (PVC-NAC). In addition, the colonization level of mussels and the adhesion rate of marine bacteria and benthic diatoms on PVC-NAC were low. The antifouling strategy proposed in this paper was eco-friendly and broad-spectrum, and may provide a new idea for solving marine biofouling and reducing the environmental and economic impacts of fouling organisms.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
·
IF 5.2
Xuefan Deng,Xun Liu,Shiyin Xia,Haixu Zhao,Yandong Liu,Qiong Ding,Haibo Zhang
Azobenzenes play an important role in dyes and pigments, food additives and pharmaceuticals. However, selective oxidation of aniline to valuable azobenzene under mild conditions is considerably challenging. Herein, through the reduction of boron clusters loaded with layered double hydroxides (LDHs), a nanometallic photocatalyst ZnTi LDH@ [ closo -B 12 H 12 ]@ 1.17%Ag(ZnTi LDH@B 12 H 12 @Ag) was synthesized. The catalyst catalyzed the synthesis of azobenzene from aniline. The catalyst achieved a high turnover frequency (TOF) of 54.9 h −1 and turnover number (TON) of 439.3. Under the reaction conditions of Na 2 CO 3 , at 40 °C and irradiation at 365 nm with an ultraviolet light source at atmospheric pressure, the yield of azobenzene reached 95.3% after 8 h of reaction and the catalytic activity remained above 80% after six recycles. This study reports a new synthetic catalyst for the selective oxidation of aniline compounds to azobenzene.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2023
·Vol. 141
·期 12
·e55129
·
IF 3
Hanyu Ren,Andi Guo,Wentang Wang,Chunhui Luo
As a load-bearing tissue, natural cartilages possess a compressive stress above 50 MPa, a water content around 60%, and a friction coefficient (FC) less than 0.1, which remains difficult for synthetic materials to realize. Herein, a facile strategy was reported to achieve this goal. The hydrogel was obtained through a three-step strategy from polyvinyl alcohol (PVA), chitosan (CS), sodium carboxymethyl cellulose (CMC-Na), lecithin (LS), and deionized water. First, freezing–thawing the aqueous solution of PVA and CS three times generated the precursor gel. Second, immersing it in aqueous solution of CMC-Na to form multiple linkages (hydrogen bonds, ionic interactions, and crystallize domains). Third, it was coated with LS to form a lubrication layer. Due to the synergy of dynamic interactions, the compressive stress was 115 MPa, superior to most tough hydrogels. Owing to existence of LS, the FC was 0.03, better than the requirement for artificial cartilage. Remarkably, the FC remained stable within 50,000 wear cycles. On account of the reversible break/reformation of physical linkages, the creep recovery efficiency was 93%. The raw materials are all biocompatible and the fabrication process exclude the adoption of toxic additives. All of these features make it an ideal material for cartilage replacement.
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International Journal of Nanomedicine
·
2021
·
IF 6.4
Yarong Wang,Xueling Yan,Qiming Kou,Qi Sun,Yuexin Wang,Ping Wu,Lulan Yang,Jiaming Tang,Tao Le
Purpose Sulfamethazine (SMZ) exposed in the environment can enter the human body through the food chain and pose a serious threat to human health. Therefore, it is important to develop a rapid and sensitive method for detecting SMZ in environmental samples. In order to fastly and quantitatively detect SMZ in environmental samples, we developed a label-free fluorescent aptasensor based on specific aptamer (SMZ1S) and fluorescence resonance energy transfer (FRET) between gold nanoparticles (AuNPs) and rhodamine B (RhoB).Methods In the absence of SMZ, SMZ1S was adsorbed on the surface of AuNPs, which led to dispersion of the AuNPs in high concentration saline solution, thus effectively quenching the fluorescence of RhoB. With the increase of the SMZ concentration, the specific binding of SMZ1S and SMZ led to the aggregation of AuNPs in the presence of NaCl, which reduced the quenching of RhoB fluorescence and increased the fluorescence intensity. The sensitivity and linearity curve of the label-free fluorescent aptasensor were determined with different concentrations of sulfamethazine standard solutions. The specificity of this fluorescent aptasensor was determined by replacing sulfamethazine with different antibiotics. In addition, the actual water and soil samples were spiked and recovered.Results Under optimized conditions, the proposed fluorescent aptasensor demonstrated a good linear detection of SMZ in binding buffer from 1.25 ng mL−1 to 40 ng mL−1 and the limit of detection was 0.82 ng mL−1. The spiked recoveries for SMZ were 94.4% to 108.8% with a relative standard deviation of 1.8–10.3% in water and soil samples, respectively.Conclusion The label-free fluorescent aptasensor investigated in the current study is a promising tool to detect and quantify SMZ in water and soil samples.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 13
·17490-17499
·
IF 2.478
Qie Yaqin,Liu Yixuan,Kong Fanqi,Shi Zhan,Yang Hua
Magnetic cobalt nanomaterials, due to the high magneto-crystalline anisotropy, are favorable candidates for hard magnets. Herein, we improved the polyol process, which replaces α-diol with cost-effective 1,4-butanediol, and explored the best conditions for the synthesis of hard magnetic cobalt materials. The synthesized hexagonal cobalt nano-urchins exhibited a high coercivity of 2891.5 Oe. Further, we also studied the influence of the structure and morphology of cobalt nanomaterials on the oxygen evolution reaction (OER) activity. This combination of highly crystalline hexagonal close-packed nanostructure and special branch morphology can effectively enhance OER performance.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yi Zheng,Wenping Ma,Zhibo Yang,Hongjian Zhang,Jingge Ma,Tian Li,Huicong Niu,Yanling Zhou,Qingqiang Yao,Jiang Chang,Yufang Zhu,Chengtie Wu
Rapid hemostasis and wound healing for emergency trauma is the key to ensure the survival of patients with massive hemorrhage. However, it is still a challenge to develop hemostatic materials with both excellent hemostatic activity and wound healing function. Herein, we propose to fabricate an inorganic hemostatic aerogel mainly based on biocompatible inorganic ultralong hydroxyapatite (HAP) nanowires with polyvinyl alcohol (PVA) as organic binder, and the hemostatic aerogel is prepared by using freeze-drying technology to construct three-dimensional (3D) porous structure, which possesses good plasticity and flexibility. When the content of ultralong HAP nanowires reaches 80 wt%, the W-8HAP-2PVA aerogel (aerogel consists of 80 wt% ultralong HAP nanowires and 20 wt% PVA) exhibits super-hydrophilicity/super-hematophilicity, and its in vitro blood clotting index is only 3.81 ± 0.71 %, which is much lower than that of medical gauze. When applied in hemostasis of rat liver and rabbit femoral artery, the hemostatic time and blood loss amount of the W-8HAP-2PVA aerogel are 26.59 ± 7.46 s, 0.18 ± 0.05 g and 174.00 ± 16.57 s, 2.18 ± 1.56 g, respectively. Benefiting from its excellent hydrophilicity and high porosity structure, W-8HAP-2PVA aerogel can quickly absorb water from blood to concentrate blood cells and platelets and accelerate hemostasis. Notably, it shows good hemocompatibility and cytocompatibility, and is able to promote skin wound healing. Hence, W-8HAP-2PVA aerogel has great potential in rapid hemostasis and wound healing for clinical settings.
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DYES AND PIGMENTS
·
2021
·
IF 4.889
Kun Yan,Lancheng Wang,Huimin Zhou,Zhendong Hua,Peng Xu,Hui Xu,Youmei Wang,Bin Di,Chi Hu
Typical AIE luminogens with extensive π-electron conjugation are limited in use on account of their complex synthesis, high cost and environmental concerns. To this end, we report here a novel host-guest inclusion complex that is assembled from nonemissive ligands, and surprisingly exhibits notable AIE features in aqueous solution while maintaining good sensitivity for ketamine (KET) detection. Isothermal titration studies confirm that palmatine (PAL) binds to cucurbit[8]uril (Q8) in a 2:1 ratio with an equilibrium association constant of 1.75 × 10 11 M −2 , suggesting that the unconventional AIE effects can be attributed to the stacking of two PAL moieties inside a single Q8 cavity. Geometric constraints of the macrocycle result in dimeric coupling of PAL in the ground state with significant bathochromic shifts in absorption and emission, which can be readily excited to exhibit enhanced photoluminescence . The unusual upfield perturbation and broadening of Q8 signals in the 1 H NMR spectrum upon binding with PAL convey decisive information that Q8 not only serves as a molecular container, but also participates in the electron delocalization during the AIE events. Upon addition of KET, fluorescence was switched off through guest exchange to generate [email protected] as well as free PAL. The significant AIE characteristics of 2* [email protected] in combination with its specific molecular recognition towards KET gives rise to 5.0 ng/mL limit of detection with linear range from 16.8 to 500 ng/mL, and a pronounced selectivity over possible interfering substances in biological matrices. We demonstrate the first example of Q8-mediated AIE effects, where the photoluminescence of virtually nonemissive or feebly emissive ligands is remarkably intensified through clustering inside a macrocyclic host molecule, therefore offering great promise for further development into dedicated AIE-based sensors.
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Polymers
·
2021
·Vol. 13
·期 19
·3341
·
IF 4.329
Xiuhua Yuan,Yeling Liu,Hui Yuan,Bingxin Liu,Tianyu Guo,Huawei Zhou,Xia Li
While the CuBi2O4-based photocathode has emerged as an ideal candidate for photoelectrochemical water splitting, it is still far from its theoretical values due to poor charge carrier transport, poor electron–hole separation, and instability caused by self-photoelectric-corrosion with electrolytes. Establishing synthesis methods to produce a CuBi2O4photocathode with sufficient cocatalyst sites would be highly beneficial for water splitting. Here, the platinum-enriched porous CuBi2O4nanofiber (CuBi2O4/Pt) with uniform coverage and high surface area was prepared as a photocathode through an electrospinning and electrodeposition process for water splitting. The prepared photocathode material was composed of a CuBi2O4nanofiber array, which has a freestanding porous structure, and the Pt nanoparticle is firmly embedded on the rough surface. The highly porous nanofiber structures allow the cocatalyst (Pt) better alignment on the surface of CuBi2O4, which can effectively suppress the electron–hole recombination at the electrolyte interface. The as-fabricated CuBi2O4nanofiber has a tetragonal crystal structure, and its band gap was determined to be 1.8 eV. The self-supporting porous structure and electrocatalytic activity of Pt can effectively promote the separation of electron–hole pairs, thus obtaining high photocurrent density (0.21 mA/cm2at 0.6 V vs. RHE) and incident photon-to-current conversion efficiency (IPCE, 4% at 380 nm). This work shows a new view for integrating an amount of Pt nanoparticles with CuBi2O4nanofibers and demonstrates the synergistic effect of cocatalysts for future solar water splitting.Keywords:electrospinning;CuBi2O4nanofiber;photocathode;water splitting
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2021
·
IF 5.279
Shizhong Li,Chaoning Liang,Guoxia Liu,Jian-Ming Jin,Yong Tao,Shuang-Yan Tang
Engineering an artificial microbial community for natural product production is a promising strategy. As mono- and dual-culture systems only gave non-detectable or minimal chlorogenic acid (CGA) biosynthesis, here, a polyculture of three recombinant Escherichia coli strains, acting as biosynthetic modules of caffeic acid (CA), quinic acid (QA), and CGA, was designed and used for de novo CGA biosynthesis. An influx transporter of 3-dehydroshikimic acid (DHS)/shikimic acid (SA), ShiA, was introduced into the QA module—a DHS auxotroph. The QA module proportion in the polyculture and CGA production were found to be dependent on ShiA expression, providing an alternative approach for controlling microbial community composition. The polyculture strategy avoids metabolic flux competition in the biosynthesis of two CGA precursors, CA and QA, and allows production improvement by balancing module proportions. The performance of this polyculture approach was superior to that of previously reported approaches of de novo CGA production.
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高影响因子
危险品化学品经营许可证（带存储）