Nanophotonics
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2022
·Vol. 11
·期 22
·5121-5131
·
IF 7.923
Ao Liu,Yiqiao Chen,Biwen Yang,Zhouyi Guo,Luoqi Mo,Haolin Chen,Chenglong Tao,Chengkang Su,Zhiming Liu
Fluorescence microscopy based on fluorochrome has been rapidly developed as the candidate for morphological identification of pathogenic fungi over recent years, offering superior rapidity and efficacy over traditional culture methods. However, the intrinsic quenching properties of fluorescein limit the clinical application of fluorescence imaging. Herein, we report a nano-strategy by converting a commercial fluorescein dye, fluorescent brightener-33 (FB-33), into carbon dots (FB-CDs) through a one-pot hydrothermal method. FB-CDs exhibit a chitin-targeting capacity allowing the selective recognition and ultrafast imaging of fungi within 30 s. The fluorescence quantum yield of FB-CDs is 51.6% which is 8.6-fold higher than that of commercial dye, FB-33. Moreover, FB-CDs also display superstable fluorescence signals under continuous intense light irradiation for 2 h and long-term storage for more than 2 months. The significantly improved photobleaching resistance meets the prolonged fluorescence observation and quantitative analysis of microbial samples. This work offers a novel nanoconversion strategy of commercial dyes for point-of-care testing of pathogenic organisms.
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MACROMOLECULAR MATERIALS AND ENGINEERING
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2022
·Vol. 308
·期 4
·2200529
·
IF 4.402
Peijie Sun,Qiaoling Li
PVA-BB/GO-Fe 3+ /agar hydrogels (BB is configured by 1:1 configuration of 0.04 mol L −1 boric acid solution and 0.04 mol L −1 borax solution) are designed with excellent mechanical and electrical properties due to their triple cross-linked network, and they maintain stable performance in various tests, which is sufficient to support the use of hydrogels in multiple scenarios. Meanwhile, the tension responsiveness of the PVA-BB/GO-Fe 3+ /agar hydrogel allows it to rapidly transmit signal changes upon tension changes. Finally, maintaining increased energy dissipation and strength enhancement during the loading–unloading cycle provides the possibility of long, stable operation. In summary, it is believed that PVA-BB/GO-Fe 3+ /agar hydrogel has significant potential in the field of flexible sensors and is expected to be fabricated as a sensor for motion monitoring.
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2022
·
IF 5.999
Lerong Liu,Weizheng Song,Wan Zheng,Feihu Li,Hanlin Lv,Yuhang Wang,Yanjun Chen,Yifeng Wang
Multilayer beads made from biomacromolecules are useful for encapsulating, protecting, and delivering active ingredients such as drugs, dyes, and proteins. However, their encapsulated cargos are allowed to diffuse slowly out into the surrounding solvent during storage. This study describes a “smart” multilayer bead that can achieve zero leakage for encapsulated materials during storage and controlled release after triggered by near-infrared (NIR) light. The innermost layer of the multilayer bead containing Fe 3 O 4 magnetic nanoparticles is prepared based on the thermal-responsive sol-gel transition of agar, which offers magnetic responsiveness to the bead. The middle layer of the bead embedding gold nanorods (Au NRs) is produced by the ionic crosslinking between alginate and terbium ions. Moreover, encapsulated materials (drugs, dyes, and agrochemicals) are loaded in the middle layer. The outermost layer of the bead, a paraffin-wax shell, is formed at 75 ℃ through the phase transition of paraffin wax . Because of the protection of the paraffin-wax shell, the encapsulated materials present zero leakage when the multilayer bead is placed in aqueous solutions for at least six weeks. Under the irradiation of 808 nm NIR light for 1 min, the multilayer bead is heated up to 50 ℃ by the photothermal effect of Au NRs in the middle layer, which triggers the melting of the paraffin-wax shell. Then, the controlled release of the encapsulated materials can be achieved by the rest of the bead. Furthermore, the bead can be recycled after the release due to its magnetic responsiveness. Consequently, the multilayer bead is a novel, green and economical candidate for diverse applications, especially for the encapsulation and controlled release of hydrophilic materials in bio-related applications.
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CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Zhen Nie,Kelin Peng,Lizhi Lin,Jueying Yang,Zhekun Cheng,Qiang Gan,Yu Chen,Changgen Feng
Conductive hydrogels (CHs) have drawn wide attention from the field of flexible sensor for their similarities to tissues, excellent flexibility and good electrical conductivity. However, most of the reported hydrogel-based flexible sensors display the disadvantages of poor tensile strength, low sensitivity and insufficient stability, and most of them are prepared with non-degradable synthetic polymers, which have greatly limited their application. To solve these problems, in this work, we have constructed an agar-based dynamic double cross-linked CH by the dynamic crosslinking between agar and borax via borate bonds and the hydrogen bonds between agar chains. The CH exhibits excellent electrical conductivities, tensile properties and self-healing abilities. A novel two-dimensional material, MXene nanosheet, was introduced to further improve the mechanical properties and ionic conductivity of the CH with its high ionic conductivity and ability to form hydrogen bonds with agar. The obtained Agar/Borax/MXene CH displays the excellent strength and elongation of 129 kPa and 105.1 % and the satisfying ionic conductivity of 8.14 × 10 −2 S/cm. The flexible sensor assembled with Agar/Borax hydrogel with 0.15 wt% MXene exhibits a wide strain detection range from 0 to 100 %, high sensitivity (GF≈1.520) and good stability. Our work has provided a novel strategy for the construction of green flexible sensors with good mechanical properties and high sensitivity.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Ying Liu,Jingfeng Gao,Mingyan Zhao,Xiaoyu Fu,Yi Zhang,Haoran Zhang
As the emerging contaminants , antibiotic resistant bacteria (ARB) and antibiotic resistance genes (ARGs) have caught considerable research attention, horizontal gene transfer is one of the most primary contributors to antibiotic resistance dissemination. The application of the oxidant peroxymonosulfate (PMS) as a disinfection alternative has been systemically explored. Also, the effects of various process parameters on ARB inactivation and plasmid-mediated horizontal transfer inhibition, initial bacterial concentration, pH value and temperature, were systemically investigated. The changes in cell substances (cell membrane integrity and intracellular reactive oxygen species) were determined by flow cytometry. The results suggested that the inactivation efficiency of Escherichia coli DH5α (donor) and Pseudomonas sp. HLS-6 (recipient) by 0.8 mM PMS treatment reached 4.45 log and 4.15 log in 30 min, respectively. The conjugative transfer didn’t arise after treatment for only 1 min when the dosage of PMS exceeded 0.4 mM. PMS could work in a wide pH and ambient temperature range. It also showed significant removal efficiency on intracellular ARGs and extracellular ARGs. To identify the underlying mechanisms of restraining conjugative transfer, the mRNA expression of conjugative genes, oxidative stress genes, save our souls (SOS) response-related gene, cell outer membrane proteins genes and global regulatory genes were evaluated. The results demonstrated that the expressions of these genes were altered by 0.8 mM PMS treatment. PMS has the advantages of low cost, easy operation and technical applicability. This study illustrated that PMS treatment showed great potential for controlling the antibiotic resistance for wastewater treatment .
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CELLULOSE
·
2022
·Vol. 29
·期 13
·7477-7494
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IF 6.123
Liu Wenjing,Cheng Wei,Zhou Man,Xu Bo,Wang Ping,Wang Qiang,Yu Yuanyuan
As a kind of melanin-like nanoparticles, poly(levodopa) nanoparticles have abundant reactive catechol groups, which provide the basis for the structure design of melanin-like nanoparticles. In this work, we synthesized silver/melanin-like nanoparticles (Ag-SMNPs) using a one-step method. The results of X-ray photoelectron spectroscopy (XPS) showed that the chemical structures of Ag-SMNPs were not only loaded with silver nanoparticles (Ag NPs), but also formed a complex structure with silver ions. Ag-SMNPs-modified fabrics (Ag-SMNPs@Cotton) had demonstrated excellent anti-ultraviolet radiation, photothermal, and antibacterial properties. UV protection levels of the modified fabrics had reached UPF50 + , and their surface temperatures had exceeded 100 °C when irradiated by a Xenon lamp for 1 min. As for the antibacterial activity, the survival rates of Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ) on the surface of the modified fabrics were 1.94% and 5.92%, respectively, when the fabrics were irradiated by Xenon lamp for 10 min. Without Xenon lamp irradiation, the survival rates on the modified fabrics were 3.35% and 2.53% for E. coli and S. aureus , respectively, when bacteria were in contact with the fabric for 6 h. Additionally, the modified fabrics also maintained an outstanding air and moisture permeability. Multifunctional melanin-like nanoparticles provide a new option for material modification.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Ping Li,Youyou Feng,Dong Cheng,Jing Wei
Mesoporous vanadium oxide nanospheres are a very promising nanozyme for antibacterial and chemical sensing. However, controllable synthesis of mesoporous vanadium oxide nanospheres with uniform structure and small diameter (<200 nm) remains challenging. Herein, mesoporous vanadium oxide nanospheres (MVONs) with a small, uniform and adjustable particle size (52–105 nm), large mesopore size (5.1–5.8 nm), and high specific surface area (up to 63.7 m 2 g −1 ) are constructed via a self-template strategy using tannic acid, formaldehyde and vanadium compounds as a polymerizable ligand, cross-linking agent and metal source, respectively. The relationships between synthesis conditions and material nanostructure are systematically investigated. The particle size and peroxidase-like activity of MVONs can be easily changed by adding different amounts of Pluronic block copolymer F127. Owing to the mesoporous structure, high specific surface area and small particle size, MVONs can effectively convert H 2 O 2 into extremely toxic reactive oxygen species, and further kill Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ). This research establishes a universal, reliable method for synthesizing mesoporous vanadium oxide nanospheres, which might be used in catalysis, biosensors, and antibacterial treatment.
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PubMed
高影响因子
DESALINATION
·
2022
·
IF 11.211
Shao-Lu Li,Juntao Wang,Yaxu Guan,Junping Miao,Runsha Zhai,Jindi Wu,Yunxia Hu
Membrane fouling is the major obstacle to hinder the extensive application of polyamide thin-film composite reverse osmosis (PA TFC RO) membranes in the water purification and reclamation fields. In this study, a series of hydrophilic and charge-tuned antifouling RO membranes were fabricated by grafting three kinds of small molecules of multi-grade amines N , N -dimethylethylenediamine (DMEDA), (2-aminoethyl) guanidine (AEGu) and (2-aminoethyl)triethylenediamine (AEDABCO) via layer-by-layer interfacial polymerization (LbL-IP). Detailed characterizations revealed that the three tailored membranes presented obviously diminished surface negative charge and reduced PA layer thickness, the water permeability increased by 67.4 %, 34.7 % and 75.6 % compared to the pristine membrane , reached 4.05 L m −2 h −1 bar −1 , 3.26 L m −2 h −1 bar −1 , and 4.28 L m −2 h −1 bar −1 , respectively, meanwhile kept high NaCl rejection > 98.5 %. The dynamic fouling tests indicated that the tailored membranes exhibited much improved antifouling performance towards most of the model organic foulants. Meanwhile the membranes assembled with cationic groups exhibited an enhanced antibacterial property against E. coli . These functional small charged molecules and the convenient modification method provide a valuable pattern for designing antifouling PA TFC RO membranes, which is important for sustainable water purification.
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CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Qi Xu,Qi-Xing Xie,Tong Xue,Gao Cheng,Jian-Dong Wu,Lan Ning,Xiang-Hui Yan,You-Jun Lu,Zhong-Li Zou,Bei-Ping Wang,Feng-Lan Han
The electrolytic Zn-MnO 2 aqueous battery is an attractive energy storage technology with a high working voltage and energy density for the large-scale application. Here, a three-phase decoupled Zn-MnO 2 electrolytic battery is designed. A salt bridge gel as an intermediate is introduced to separate the catholyte and anolyte in this design. This battery behaves a wide electrochemical stability window and a high discharge voltage of 2.5 V with 95 % capacity retention after 350 cycles. The working mechanism has also been discussed in this study via ex-situ analysis.
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Journal of CO2 Utilization
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2022
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IF 8.321
Hongmin Cui,Jianguo Xu,Jinsong Shi,Nanfu Yan,Chao Zhang,Shengyong You
N-doped porous carbons have shown great potential as CO 2 adsorbents. In the current work, we proposed the use of oxamic acid potassium salt (OAPS) as a novel and bifunctional activator for direct synthesis of N-doped porous carbon. OAPS served as both chemical activator and nitrogen source at the same time. N-doped carbons were prepared from different biomass materials including cellulose , agar, and glucose. The yielded carbons exhibited micropores dominated porous structure . Effects of activation conditions and biomass types on the carbons’ physicochemical properties were thoroughly studied. As a result, the carbons showed high specific surface area (733–2438 m 2 /g) and nitrogen content (1.51–3.92 wt%). The presence of narrow micropores and doped nitrogen qualified OAPS activated carbons as efficient CO 2 adsorbents. These carbons demonstrated high CO 2 uptake of 3.91 mmol/g at 25 °C and 1 bar. Respective effects of narrow micropores and N-doping on CO 2 adsorption were also analyzed and revealed. The current study indicated that OAPS could be used as a very convenient and versatile activator for the preparation of N-doped carbonaceous CO 2 adsorbents.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 42
·e53009
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IF 3.057
Jiaqian Zhu,Huihui Yuan,Shunqi Zhang,Xiang Hao,Minbo Lan
Implanted medical devices are widely used in clinic for disease treatment, but they generally suffer from the bio-fouling problem which leads to the reduction of service life and loss of therapeutic effects. Herein, an eco-friendly method based on polydopamine (PDA) fast deposition is developed to construct anti-fouling and antibacterial surface on polyurethane (PU). The self-adhesive layer of PDA contributes to the formation of a platform with active sites for further antibacterial and hydrophilic modification. Polyhexamethylguanidine (PHMG) as antibacterial ingredient and chondroitin sulfate (CS) as hydrophilic component covalently bind on PDA platform, which successively helps to form PU-PDA/PHMG/CS. The resultant surface demonstrates the excellent property of anti-protein adsorption (96.8%), anti-bacterial ability (99.9%), and cell compatibility (95.0%), which would have great potential for medical application.
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Water
·
2022
·Vol. 14
·期 16
·2543
·
IF 3.53
Qi Han,Wenyi Dong,Hongjie Wang,Boping Yu,Peng Liu,Linshen Xie,Zhiguang Dai
This study has focused on the evaluation of the biotoxicity controlling effects during the TBBPA degradation by ozonation, including the acute, chronic and genetic toxicity under different [O3]/[TBBPA] (1:1–11:1), initial solution pH (5.0–9.0) and temperatures (10–40 °C). In addition, the comprehensive biotoxicity of the treated water sample was evaluated by the method of potential ecotoxic effects probe (PEEP). The results showed that TBBPA could be completely degraded with an initial solution pH of 7.0, temperature of 25 °C and an [O3]/[TBBPA] ratio of 9:1. The chronic toxicity of the untreated sample was as high as 41.7 TU, which represented the main toxicity of TBBPA itself. In contrast, the TBBPA showed a much lower acute and genetic toxicity in this study. During the process of TBBPA degradation, the ozonation could effectively control the toxicity of wastewater and showed strong adaptability. When the ratio of [O3]/[TBBPA] was 11:1, the acute and chronic toxicity were reduced to 0.02 TU and 0.76 TU, respectively, with the controlling rates being as high as 96% and 98.2% and meeting the emission standards. The mutagenicity ratio of the water sample was less than 2.0, indicating no genotoxicity risk. The evaluation of the comprehensive biological toxicity showed that ozonation could control the PEEP value below 2.0 in ranges of low [O3]/[TBBPA] ratio (3:1), wide pH (5–9) and temperatures (10–40 °C).Keywords:ozonation;tetrabromobisphenol A;acute toxicity;chronic toxicity;comprehensive biological toxicity
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