RSC Advances
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2022
·Vol. 12
·期 10
·6083-6092
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IF 4.036
Xia Chen,Yongjie Li,Qiang Fu,Hongyun Qin,Junnan Lv,Kun Yang,Qicheng Zhang,Hui Zhang,Ming Wang
The use of large amounts of deleterious solvents in the synthesis of metal–organic frameworks (MOFs) is one of the important factors limiting their application in industry. Herein, we present a detailed study of the synthesis of UiO-66, which was conducted with hydrobromic (HBr) acid as a modulator for the first time, at a high concentration of precursor solution (ZrCl4 and H2BDC, both 0.2 mol L−1). Powder crystals with atypical cuboctahedron structure were obtained which indicated that the HBr acid modulator played roles by competitive coordination and deprotonation modulation, thereby controlling the processes of nucleation and crystal growth. The properties of the obtained materials were systematically characterized and compared with those of materials synthesized with hydrofluoric (HF) acid and hydrochloric (HCl) acid modulators. Despite the high concentration of defectivity, the UiO-66 material synthesized with the HBr acid additive has the characteristics of larger specific surface area, excellent thermal stability and higher porosity in the structure. Besides that, the present protocol has the advantages of high reaction mass efficiency (RME), and feasibility of scalable synthesis, providing a facile and sustainable route to diverse Zr-based MOFs.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Jing Fu,Fuchao Yang,Fan Cheng,Zhiguang Guo
Improving the performance of recycled paper (R paper) can broaden its applicability in different fields and is conducive to saving resources. Herein, we report a simple method to prepare R paper using waste-print-paper pulp mixed with ketjenblack and ammonium polyphosphate followed by modification with polydimethylsiloxane . The R paper demonstrated good electrical conductivity of 14.83 S/m. Water contact angle (WCA) and sliding angle (SA) were used to assess the wettability of the prepared R paper. The WCA and SA of the R paper reached 152 ± 2° and 3.5°, respectively, thereby indicating excellent superhydrophobicity. Vertical flame tests and thermogravimetric analysis proved that the flame retardancy of the R paper was superior to that of the waste-print paper. These results suggested that the R paper with conductive, flame-retardant, and superhydrophobic properties can be obtained by incorporating specific fillers into waste-print paper, thereby increasing the potential for the application of R paper.
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FUEL
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2022
·
IF 8.035
Wennan Xu,Yuxin Li,Xin Liu,Yining Zhao,Rui Li,Rui Li,Hongliang Li
Interactions between coal matrix and organics are vital for adsorption [1] , surfactant adsorption on lignite [2] , [3] , [4] , [5] , and solid–liquid separation of coal slurry [6] , [7] , [8] , [9] , [10] . Herein, for studying the interaction between hydrophobic surface (coal surface) and small molecules (organics), we measured interactions between organics [nitro and phenyl , pyridine , phenyl, alkyl chain (hexyl) or cycloalkyl (hexyl)] and the coal matrix (liptinite or inertinite) using atomic force microscopy . The strength of interaction followed the order: nitro and phenyl > pyridine > phenyl > alkyl chain (hexyl) > cycloalkyl (hexyl), and liptinite > inertinite . The liptinite has a greater hydrophobicity than inertinite, the greater the attraction force. The lignite surface and coal slurry were modified in an aqueous solution using five surfactants (dodecyl trimethyl ammonium chloride , DTAC; hexadecyl trimethyl ammonium chloride, CTAC ; octadecyl trimethyl ammonium chloride, STAC; hexadecyl dimethyl benzyl ammonium chloride, HDBAC; and cetyl pyridine chloride, CPC). Subsequently, the moisture adsorption on treated lignite coal surface and the sedimentation of the treated tails was compared to characterize hydrophobic modifications which showed the order of CTAC > HDBAC > DTAC > CPC > STAC. Thus, the interaction between coal surface and organics needs to consider two rules: 1) The desolvation or the hydrophobic property of the coal surface; 2) The VDW force of the organics. The nature of the difference between rules No. 1 and 2 is that with the size of hydrophobic molecules increased to a surface, the H-bond structure between water molecules in the around would change a lot, which formats great hydrophobic property or desolvation. Synopsis Interaction between organic reagents and coal reveals the mechanism of restraining moisture reabsorption of lignite and solid–liquid separation of coal slurry by organics.
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Biomedical Materials
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2022
·Vol. 17
·期 2
·025005
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IF 4.103
Bo Li,Hong Li,Haocheng Yang,Yue Shu,Kejiang Li,Ke Chen,Wenqian Xiao,Xiaoling Liao
Pure gelatin hydrogels lack antibacterial function and have poor mechanical properties, which restrict their application in wound dressings. In this study, nanosized silver bromide-doped mesoporous silica (AgBr@SiO2) microspheres with hollow structures were prepared by a modified Stober method. The novel microspheres can not only release silver ions to treat bacteria but also release drugs to treat skin wound. Furthermore, AgBr@SiO2 microspheres were modified with propyl methacrylate, incorporated into methacrylated gelatin (GelMA), and crosslinked by UV light to prepare AgBr@SiO2/GelMA dressings consisting of composite hydrogels. The results showed that the AgBr@SiO2 microspheres could enhance the mechanical properties of the hydrogels. With the increase in the AgBr@SiO2 concentration from 0.5 to 1 mg ml−1, the dressings demonstrated effective antimicrobial activity against both Staphylococcus aureus and Escherichia coli. Furthermore, full-thickness skin wounds in vivo wound healing studies with Sprague–Dawley rats were evaluated. When treated with AgBr@SiO2/GelMA containing 1 mg ml−1 AgBr@SiO2, only 15% of the wound area left on day 10. Histology results also showed the epidermal and dermal layers were better organized. These results suggest that AgBr@SiO2/GelMA-based dressing materials could be promising candidates for wound dressings.
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TALANTA
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2022
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IF 6.556
Linsha Wei,Junyang Ding,Jiaqi Wu,Lai Li,Qipeng Li,Li-Xiong Shao,Jianmei Lu,Jinjie Qian
Due to the harmfulness of diabetes, a fast and efficient glucose detector is particularly important. Metal-organic polyhedron (MOP) provides a porous framework and a special matrix, which makes it an excellent precursor for electrochemical detection . Herein, we report a novel MOP as a precursor for the preparation of an electrocatalytic detector for glucose. The new metal-organic polyhedron of Cu 4 (TPDC) 4 can be solvothermally obtained and characterized by X-ray crystallography, which can be thermally converted into nanosized copper oxides embedded into graphitic carbon layers ( MOP-CO ). The as-prepared MOP-CO electrode is further applied to glucose detection, which shows a fast response time (<1 s) in a wide linear range of 0–4000 μM and high sensitivity of 2720 μA mM −1 cm −2 , as well as low detection limit (26 nM (S/N = 3)), good anti-interference, repeatability and stability (>3600 s).
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Lei Qiao,Hui Ye,Qingping Xin,Lilan Huang,Yuzhong Zhang,Hong Li
A sulfonated polyethersulfone/functionalized graphene membrane (SPES/CSrGO) was developed through a facile ‘one-pot’ method for hardness removal. The concentrated sulfuric acid (H 2 SO 4 ) was used as both sulfonating agent for PES materials and solvent for preparing casting solution of SPES/CSrGO. The sulfonic acid group of SPES could form hydrogen bond with carboxyl group on CSrGO, improving the dispersibility of CSrGO in membrane. The SPES/CSrGO membrane with uniform dispersion of CSrGO showed good adsorption–desorption behavior in static adsorption. The SPES/CSrGO membrane with CSrGO content of 30 wt% (SPES/CSrGO-30) showed the highest static adsorption capacities for Ca 2+ (82.52 mg/g) and Mg 2+ (74.21 mg/g), respectively. In artificial seawater, the SPES/CSrGO-30 membrane also exhibited good adsorption performance and the adsorption capacities of Ca 2+ and Mg 2+ reached 26.27 mg/g and 50.1 mg/g. In dynamic adsorption, the adsorption capacities of SPES/CSrGO-30 for Ca 2+ and Mg 2+ were 43.63 mg/g and 34.29 mg/g, respectively. More importantly, the hydrophilicity CSrGO endowed the excellent antifouling property of SPES/CSrGO membrane. This strategy showed a high potential for the removal of hardness during the ultrafiltration process and provided a promising direction to the design of high-performance adsorptive membranes.
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SURFACE & COATINGS TECHNOLOGY
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2023
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IF 5.4
Meiyu Zhao,Yongsong Ma,Yu Zhang,Xianglin Liu,Haiou Sun,Renhe Liang,Huayi Yin,Dihua Wang
Titanium carbide (TiC) coating was prepared by in-situ carbonization of titanium using a novel salt-thermo-carburizing (STC) method in molten CaCl 2 -CaC 2 . The effect of the concentration of CaC 2 , the temperature of the melt and the reaction duration on the composition, structure and thickness of the carbide coating were systematically investigated. The optimized immersion bath was CaCl 2 –2 wt% CaC 2 at 900 °C. The thickness of the coating was increasing with the immersion time and it can reach 105 μm within 8 h. It was found that the growth kinetics of TiC coating follows a parabolic law in the temperature range of 850 to 900 °C, the obtained growth rate constants ( k ) is 1.43 × 10 −15 at 850 °C, 68.38 × 10 −15 at 875 °C, and 320.17 × 10 −15 m 2 /s at 900 °C, respectively. In addition, the microhardness of the TiC coating obtained at 850 °C and 8 h is over 740 HV, which is more than five times that of the Ti substrate. This work offers a universal and facile method to prepare metallic carbide coating on the respective metal substrate.
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Regenerative Biomaterials
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2023
·
IF 6.7
Chen Nuoya,Li Mingyu,Wu Haoshaung,Qin Yumei,Wang Jian,Xu Kai,Luo Rifang,Yang Li,Wang Yunbing,Zhang Xingdong
Anti-inflammation and anti-coagulation are the primary requirements for cardiovascular stents and also the widely accepted trajectory for multi-functional modification. In this work, we proposed an extracellular matrix (ECM)-mimetic coating for cardiovascular stents with the amplified functionalization of recombinant humanized collagen type III (rhCOL III), where the biomimetics were driven by structure mimicry and component/function mimicry. Briefly, the structure-mimic was constructed by the formation of a nanofiber (NF) structure via the polymerization of polysiloxane with a further introduction of amine groups as the nanofibrous layer. The fiber network could function as a three-dimensional reservoir to support the amplified immobilization of rhCoL III. The rhCOL III was tailored for anti-coagulant, anti-inflammatory and endothelialization promotion properties, which endows the ECM-mimetic coating with desired surface functionalities. Stent implantation in the abdominal aorta of rabbits was conducted to validate the in vivo re-endothelialization of the ECM-mimetic coating. The mild inflammatory responses, anti-thrombotic property, promotion of endothelialization and suppression of excessive neointimal hyperplasia confirmed that the ECM-mimetic coating provided a promising approach for the modification of vascular implants.
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COMPOSITES PART B-ENGINEERING
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2023
·
IF 13.1
Hanjun Gong,Yan Song,Guo Liang Li,Lin Zhang,Dan Guo,Guoxin Xie
An intelligent polymer composite with self-lubricating and self-healing functionalities is reported. The high strength intrinsic self-healing material that integrated hydrogen bond interactions into covalently linked networks was used as the matrix and the surface functionalized poly-alpha-olefin oil-containing microcapsules acted as lubricant fillers, which integrated the advantages of intrinsic self-healing and external self-lubricating strategies to realize organic combination of lubrication and healing functions in one system. The tensile and compressive strengths of the bifunctional composite can reach 59 MPa and 104 MPa, while the coefficient of friction (COF) and wear rate can reduce to 0.032 and 10 −8 mm 3 /Nm. Besides, the bifunctional composite exhibited an excellent self-healing ability of scratch and the volume self-healing efficiency of 78% was achieved at 100 °C for 3 h. The developed high strength polymer material with self-lubricating and self-healing functionalities is highly expected for engineering applications .
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2023
·
IF 11.4
Jing Wu,Jun-Hua Zhou,Dong-Feng Liu,Jie Wu,Ru-Li He,Zhou-Hua Cheng,Hui-Hui Li,Wen-Wei Li
Plastics–microorganism interactions have aroused growing environmental and ecological concerns. However, previous studies concentrated mainly on the direct interactions and paid little attention to the ecotoxicology effects of phthalates (PAEs), a common plastic additive that is continuously released and accumulates in the environment. Here, we provide insights into the impacts of PAEs on the dissemination of antibiotic resistance genes (ARGs) among environmental microorganisms. Dimethyl phthalate (DMP, a model PAE) at environmentally relevant concentrations (2–50 μg/L) significantly boosted the plasmid-mediated conjugation transfer of ARGs among intrageneric, intergeneric, and wastewater microbiota by up to 3.82, 4.96, and 4.77 times, respectively. The experimental and molecular dynamics simulation results unveil a strong interaction between the DMP molecules and phosphatidylcholine bilayer of the cell membrane, which lowers the membrane lipid fluidity and increases the membrane permeability to favor transfer of ARGs. In addition, the increased reactive oxygen species generation and conjugation-associated gene overexpression under DMP stress also contribute to the increased gene transfer. This study provides fundamental knowledge of the PAE–bacteria interactions to broaden our understanding of the environmental and ecological risks of plastics, especially in niches with colonized microbes, and to guide the control of ARG environmental spreading.
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INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Quwei Ni,Zhibin Mei,Chunxia Li,Jieying Li,Jiachun Liu,Wanqiang Liu,Jiansheng Huo,Qianming Wang
The influence of temperature on a variety of physiological or chemical processes has generated considerable interest, and recently noninvasive lanthanide-incorporated optical thermometers have been considered as promising candidates for monitoring its changes at different scales. Herein, a novel Bi3+-activated Sr3–xGdxGaO4+xF1–x phosphor with tunable color has been constructed by a cooperative cation–anion substitution strategy with to the replacement of [Sr2+–F–] by [Gd3+–O2–]. When x = 0, the sample Sr3GaO4F/Bi3+ possesses a peak wavelength at 438 nm, and this value will shift to 470 nm if x is equal to 1 (Sr2GdGaO5/Bi3+). In addition, photoluminescence tuning from blue to red has been realized successfully by an efficient Bi3+ → Eu3+ energy migration model in Sr2.6Gd0.4GaO4.4F0.6 samples. The specific Bi3+ → Eu3+ energy transfer has been explained by dipole–dipole interactions derived from a model of the Dexter pathway. Intriguingly, the two dopants (a blue signal from Bi3+ and a red signal from Eu3+) possess different thermal responses to increasing temperature. Accordingly, the intensity ratio values are sensitive to the temperature changes. The energy level cross relaxation causes the quenching effect of Bi3+, and the multi-phonon de-excitation mode leads to the thermal quenching of Eu3+. At room temperature (298 K), the determined maximum relative sensitivity (Sr) is 1.27% K–1. Moreover, the absolute sensitivity (Sa) is 0.067 K–1 since the temperature is elevated to 523 K. The collected results are superior to most of the reported optical thermometry materials.
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INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
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2021
·
IF 3.186
Ju Wang,Zhaomiao Liu,Yan Pang,Mengqi Li
ABSTRACT The significant relationship between performance parameters of compound droplets and their geometries makes accurate control of the breakup of compound jets particularly critical. The physical mechanism behind the earlier and easier loss of stability in compound jets caused by inner dispersive interfaces is still not fully known, which constrains accurate prediction of the conditions that result in the breakup of compound jets. In the present study, three perturbation modes—namely, block-off, squeeze-through, and slip-through—are found to form between an inner sphere and a liquid jet. The conditions for the occurrence of block-off are accurately predicted by solving for the radius of the liquid jets. According to analyses of the velocity profiles of liquid jets, the key reason for the loss of stability in a quasi-steady jet interface caused by the entry of a sphere smaller in size than the jet cross-section is the degradation of tracking characteristics of the sphere due to viscous shear on the sphere. These findings provide a new explanation for the long-standing question that how the inner dispersive interface triggers jet instability and can help improve the accurate control of the breakup of compound jets containing inner dispersive interface.
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