ACS Applied Bio Materials
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2018
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IF 0
Yaling Lin,Weiqiang Zhong,Chenyun Dong,Chang Zhang,Xixiang Feng,Anqiang Zhang
Cationic polymers are prospective fungicidal agents for inhibiting plant diseases because of the controllability of their structure and properties. This study investigates the effect of the hydrophobic–hydrophilic balance on the antifungal activities of antimicrobial polymers against phytopathogenic fungi (Rhizoctonia solani Kühn AG-1(IA)), the pathogen of rice sheath blight (RShB). A series of polydimethylsiloxane-polymethacrylate block copolymers containing quaternary ammonium salts (PDMS-b-QPDMAEMA, labeled as SnQm; n and m represent 1000th of the molecular weight of the PDMS and QPDMAEMA chain, respectively) were synthesized via anionic ring-opening polymerization and atom transfer radical polymerization (ATRP). The abilities of the quaternary ammonium salts to adsorb onto the surface of R. solani sclerotia and permeate the R. solani sclerotia were investigated on the basis of static water contact angles and fluorescence labeling. The results indicated that the moderately hydrophobic PDMS chain helped stabilize the attachment of the hydrophilic QPDMAEMA chain and then help it penetrate the R. solani sclerotia. Its antifungal properties toward R. solani were characterized by determining its minimum inhibitory concentration (MIC) and minimum fungicidal concentration (MFC) and the inhibition rate of R. solani sclerotia germination. The hydrophobic PDMS chains had a significant influence on the antifungal activities of amphiphilic SnQm against R. solani sclerotia. This work highlights the prospective application of amphiphilic antimicrobial polymers as antifungal agents for inhibiting plant diseases.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2019
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IF 5.589
Xu Yan,Mengmeng Song,Mo Zhou,Chunlian Ding,Zhongren Wang,Yunyan Wang,Weichun Yang,Zhihui Yang,Qi Liao,Yan Shi
CuO nanoparticles (NPs) released into aqueous environments induce metal toxicity, which generally exerts negative effects on various organisms and leads to great challenge for wastewater biotreatment. In this study, a promotion effect of CuO NPs on biological process was first found. Cr(VI) reduction by Cupriavidus basilensis B-8 (hereafter B-8) was enhanced in the presence of CuO NPs. The efficiency of Cr(VI) bioreduction was much higher with B-8 and CuO NPs (approximately 100%) than with B-8 (approximately 37.6%) and CuO NPs (39.9–44.7%) alone, indicating a stimulatory effect of CuO NPs on Cr(VI) reduction by B-8. Our material analyses revealed different response mechanisms of B-8 to Cr(VI), with and without CuO NPs. The addition of CuO NPs influenced the interaction of Cr(VI) with the N-, P-, S-, and C-related functional groups of B-8. Transcriptomic analysis indicated that multiple mechanisms, including Cr(VI) uptake and reactive oxygen species detoxification, were induced by Cr(VI). Many genes involved in various metabolic processes were significantly upregulated by the addition of CuO NPs. To a certain extent, the pressure of DNA repairment by B-8 induced by Cr(VI) was also alleviated by the presence of CuO NPs. They contributed to facilitate B-8 growth and enhance Cr(VI) reduction, even with 50 mg/L Cr(VI). This study not only elaborated the mechanisms of bacterial Cr(VI) reduction when enhanced by CuO NPs, but also provided a novel perspective for wastewater biotreatment.
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ACS Applied Nano Materials
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2018
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IF 0
Shining Ni,Tiantian Zhou,Haonan Zhang,Yongqiang Cao,Ping Yang
By virtue of the facile anion-exchange technique, smart BiOI/BiVO4 two-dimensional (2D) heteronanostructure (HNS) photocatalysts targeted for the degradation of organic pollutants have been developed by the in situ growth of BiVO4 on the scaffolds of BiOI nanoplates. The as-obtained BiOI/BiVO4 HNSs exhibited excellent 2D structure as templates of BiOI nanoplates and well structure stability due to the in situ growth pattern of BiVO4 on BiOI. The 2D HNSs exhibited superior photocatalytic activities, especially the V/I8 2D HNSs (V:I = 80%), exhibited the highest Rhodamine B (RhB) and salicylic acid (SA) degradation rates, which are 29.8 times (RhB) and 15.7 times (SA) those of the individual BiVO4 and 6.4 times (RhB) and 10 times (SA) those of BiOI, respectively. Such excellent photocatalytic activities should be attributed to the organic combination of the 2D structure and heterojunction, as verified by the detailed morphology and composition characterizations. The well-known unique advantages of 2D nanostructures such as efficient light harvesting, quick reactant transport, exposure of plenty of surface reactive sites, and significantly reduced perpendicular migration distances of photogenerated carriers from the interior to the surface of materials, coupled with enhanced carrier separation behavior due to the built-in field at the heterointerface endow the 2D HNSs with ultrastrong photocatalytic abilities. It is hoped that our work could offer a paradigm for the development of smart 2D HNS optoelectronic functional materials used in photosynthesis, solar cells, sensors, catalysis, and so on, in the future.
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APPLIED SURFACE SCIENCE
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2014
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IF 2.538
Xiuying Liu,Dan Yu,Yingchao Yu,Shujuan Ji
A novel magnetic molecularly imprinted polymer (MMIP) was developed as an adsorbent to selectively remove rhodamine B from real samples. The polymer was characterized by scanning electron microscopy, Fourier-transform infrared spectroscopy, and thermo-gravimetric analysis. Static adsorption, kinetic adsorption, and selective recognition experiments were also performed to investigate the specific adsorption equilibrium, kinetics, and selective recognition ability of the MMIP. The MMIPs had outstanding thermal stability, large adsorption capacity, and high competitive selectivity. When they were used as dispersed solid-phase extraction adsorbents in real samples, rhodamine B recovery was 79.97–81.88% and 75.56–79.74% in intra-day and inter-day reproducibility experiments with relative standard deviations lower than 2.62% and 4.28%, respectively. Extraction was optimized for yield and efficiency. Precision, accuracy, and linear working range were determined under optimal experimental conditions. The limits of detection and quantification were 1.05 and 3.49 μg L −1 , respectively. These results suggest MMIPs may be used for determination of rhodamine B in real samples.
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2013
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IF 3.554
Yan-Ling Luo,Xiao-Li Yang,Feng Xu,Ya-Shao Chen,Bin Zhang
Two kinds of thermo-sensitive poly(N-isoproplacrylamide) (PNIPAM) block copolymers, AB 4 four-armed star multiblock and linear triblock copolymers, were synthesized by ATRP with hydroxyl-terminated polybutadiene (HTPB) as central blocks, and characterization was performed by 1 H NMR, FT-IR and SEC . The multiblock copolymers could spontaneously assemble into more regular spherical core–shell nanoscale micelles than the linear triblock copolymer. The physicochemical properties were detected by a surface tension technique, nano particle analyzer, TEM, DLS and UV–vis measurements. The multiblock copolymer micelles had lower critical micelle concentration than the linear counterpart, TEM size from 100 to 120 nm and the hydrodynamic diameters below 150 nm. The micelles exhibited thermo-dependent size change, with low critical solution temperature about 33–35 °C. The characteristic parameters were affected by the composition ratios, length of PNIPAM blocks and molecular architectures. The camptothecin release demonstrated that the drug release was thermo-responsive, accompanied by the temperature-induced structural changes of the micelles. MTT assays were performed to evaluate the biocompatibility or cytotoxicity of the prepared copolymer micelles.
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POLYMER TESTING
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2017
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IF 2.464
Dong Liu,Chengsha Wei,Guanyun Yan,Guangai Sun
A series of well-defined double hydrophilic block copolymers Poly ( N -isopropylacrylamide)- b -poly (2-vinylpyridine) (PNIPAM 38 - b -P2VP 43 ) were synthesized. The ‘schizophrenic’ behavior and the aggregation process of PNIPAM- b -P2VP in response to temperature and pH in dilute aqueous solution were tested via transmittance measurements, dynamic light scattering (DLS), and small-angle neutron scattering (SANS). The results revealed that: i) both PNIPAM-core and P2VP-core micelles can be induced from an intermediate unimers state via the adjustment of temperature and pH; ii) The lower critical solution temperature (LCST) of PNIPAM homopolymers is narrowly in the range of 31–34 °C, while PNIPAM- b -P2VP diblock copolymers at pH = 7 and 2 have broad LCSTs of 25–40 °C and 41-50 °C, respectively; iii) SANS results show that only the PNIPAM- b -P2VP solution at pH = 7 and 50 °C (both blocks are hydrophobic) has a sphere form factor with diameter of about 110 nm.
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MICROPOROUS AND MESOPOROUS MATERIALS
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2016
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IF 3.349
Xiangrong Chen,Bingxue Tang,Jianquan Luo,Yinhua Wan
Polysulfone (PSF) membranes were prepared by nonsolvent-induced phase separation (NIPS) method using PSF-b-PEG copolymer as pore formation additive. The effects of copolymer composition, hydrophilic chain length and copolymer dosage on membrane morphologies, permeability, stability and biocompatibility were systematically discussed in order to determine the role of the additive. The results suggest that the copolymer composition and dosage play an important role in pore formation. The increase of PEG content in the copolymer results in larger pore size and narrower pore size distribution . The modified membranes show average surface pore sizes in the range of 11.4–15.2 nm, which increase by 14–52% compared to that of the pristine PSF membrane. With increase of copolymer dosage, the pore size increases first and then decreases. The hydrophilic chain length has no significant influence on the pore size and size distribution. The results of pure water flux and rejection agree with the variation of pore size. With increasing the copolymer dosage, the static adsorption of protein and platelet to the membrane is suppressed and thus the antifouling ability is improved. The PSF-b-PEG copolymer outperforms the common water soluble additive (i.e. PVP) in terms of the better pore forming ability and membrane stability, implying that the PSF-b-PEG copolymer would be an alternative to PVP in membrane preparation.
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ACS Applied Materials & Interfaces
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2024
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IF 8.3
Yecheng Wang,Mei Yang,Jie Wang,Yajun Shuai,Zongpu Xu,Quan Wan,Suting Zhong,Chuanbin Mao,Weidong Ping,Mingying Yang
Sunscreens play a crucial role in protecting the skin from ultraviolet (UV) damage. However, present commercial sunscreens have a tendency to generate free radicals in the UV window, resulting in serious inflammatory responses and health problems. In this study, we demonstrate that silk fibroin microspheres (SFMPs) assembled from regenerated silk fibroin (SF) could scavenge free radicals while preventing UV irradiation and thus present a promising sunscreen. The SFMP reflected more UV light than SF and presented a higher stability than that of organic commercial sunscreens. In vitro analysis proved that SFMP could more efficiently scavenge the hydroxy radical and reduce the intracellular reactive oxygen than titanium dioxide (TiO2). In vivo experiments exhibited that SFMP provided stronger skin protection against UV irradiation than commercial sunscreens and TiO2. Furthermore, SFMP treatment significantly inhibited the skin inflammatory response. This work suggests that the SFMP has great potential to be developed into a biosafe sunscreen.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Qing Yuan,Liping Yan,Yi He,Shijun Xu,Yi Sun,Han Liu,Xiangshan Hou,Huilian Zhou,Xianmin Gong
In this paper, Ni-B alloy coatings were prepared by electroless deposition, similarly, Ni-B/TiC composite coatings with TiC nanoceramic particles as the reinforcing phase were also prepared. On this basis, the composite coating was superhydrophobically modified using hexadecylmethoxysilane (HDTMS) to obtain HDTMS-modified superhydrophobic Ni-B/TiC composite coating (HDTMS* Ni-B/TiC). The hardness of the superhydrophobic coating is up to 954.9 HV, and the wettability test shows that the superhydrophobic composite coating has a water contact angle of 151.2°, and the rolling angle less than 10°. Furthermore, which maintains good non-wettability to several common household stains, in addition to good self-cleaning performance to common household dust. Electrochemical tests show that the corrosion inhibition rate of HDTMS*Ni-B/TiC superhydrophobic composite coatings reach 99.67 % and an impedance value of 3.107 × 10 5 Ω·cm −2 in 3.5 wt% NaCl solution at room temperature. Overall, the prepared superhydrophobic composite coatings have good hydrophobicity, corrosion resistance, and high hardness, which are of extensive research value.
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Materials Today Communications
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2024
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IF 3.7
Zhengliang Deng,Yajun Wang,Ruihua Liu,Wenyu Li,Qiang Gan
In order to improve the overall performance of traditional thermite, Al/B/Fe 2 O 3 composite thermites were synthesized using electrophoretic deposition technology. The morphology, structure, composition, thermal reaction properties, reaction process, and reaction activity were investigated using X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), X-ray energy dispersive spectrometry (EDS), X-ray diffractometer (XRD), and simultaneous thermal analyzer (TG-DSC). The results indicate that the components of the prepared Al/B/Fe 2 O 3 composites were uniformly distributed and closely interconnected, with the preparation process not altering the composition and structure of the components. Compared with Al/B/Fe 2 O 3 thermite prepared by physical mixing and Al/Fe 2 O 3 thermite by electrophoretic deposition, the Al/B/Fe 2 O 3 thermite prepared by electrophoretic deposition exhibited a lower reaction onset temperature (524.9 ℃), higher heat release (1240.9 J·g −1 ), and greater reactivity ( E a =168.3 kJ·mol −1 ). These findings underscore the significant enhancement effect of boron addition and the electrophoretic deposition method on the overall performance of Al/Fe 2 O 3 thermite. Analysis of the reaction mechanism reveals that the Al/B/Fe 2 O 3 composite thermites underwent a series of complex transformations, including thermite reactions, alloying reaction between Al and B, direct oxidation reactions of Al, B, Fe, and nitriding reaction of B, within the temperature range of thermal analysis from room temperature to 1100 ℃. These results provide crucial support for material innovation, performance optimization, and application expansion of thermites.
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ACS Omega
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2024
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IF 3.7
Xin Zhao,Yishuai Jing,Zhonghua Dai,Yuanbo Chu,Zhenyu Liu,Yu Cong,Jiaming Song
As a wide-bandgap rare-earth oxide, Eu2O3 was often utilized as an auxiliary material of other photocatalysts because its photocatalytic performance was limited by the luminescence characteristics of Eu3+ and low light utilization. In this study, we improved the photocatalytic degradation performance of the Eu2O3 nanoparticles by doping with Fe cations. The Eu2O3 nanoparticles with different Fe-doping concentrations (1, 3, and 5%, noted as EF1.0, EF3.0, and EF5.0, respectively) were synthesized via chemical precipitation and calcination methods. It was found that doping could reduce Eu2O3’s bandgap, which probably originated from the introduction of oxygen vacancies with lower energy levels than the conduction band of Eu2O3. Compared with the undoped Eu2O3 nanoparticles with a removal efficiency of 22% for degrading rhodamine B dye within 60 min, the photocatalytic degradation efficiencies of EF1.0, EF3.0, and EF5.0 were demonstrated to be improved to 42, 48, and 33%, respectively, and EF3.0’s performance was the best. The enhanced photocatalytic performance of the doped samples was related to the oxygen vacancies acting as capture centers for electrons, such that the photogenerated electron–hole pairs were efficiently separated and the redox reactions on the surface of the nanoparticles were enhanced accordingly. Additionally, the enhanced light absorption and broadened spectral band further improved EF3.0’s degradation efficiency.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Yuying Zhao,Shengchun Hu,Qixin Yuan,Ao Wang,Kang Sun,Ziyun Wang,Mengmeng Fan,Jianchun Jiang
Electrochemical CO 2 conversion into formate by intermittent renewable electricity, presents a captivating prospect for both the storage of renewable electrical energy and the utilization of emitted CO 2 . Typically, Cu-based catalysts in CO 2 reduction reactions favor the production of CO and other by-products. However, we have shifted this selectivity by incorporating B, N co-doped carbon (BNC) in the fabrication of Cu clusters. These Cu clusters are regulated with B, N atoms in a porous carbon matrix (Cu/BN-C), and Zn 2+ ions were added to achieve Cu clusters with the diameter size of ∼1.0 nm. The obtained Cu/BN-C possesses a significantly improved catalytic performance in CO 2 reduction to formate with a Faradaic efficiency (FE) of up to 70 % and partial current density (j formate ) surpassing 20.8 mA cm −2 at −1.0 V vs RHE. The high FE and j formate are maintained over a 12-hour. The overall catalytic performance of Cu/BN-C outperforms those of the other investigated catalysts. Based on the density functional theory (DFT) calculation, the exceptional catalytic behavior is attributed to the synergistic effect between Cu clusters and N, B atoms by modulating the electronic structure and enhancing the charge transfer properties, which promoted a preferential adsorption of HCOO* over COOH*, favoring formate formation.
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