Materials Today Sustainability
·
2023
·
IF 7.8
Cheng-Min Hou,Wei-Min Yan,Tian Liu
At present, the silver nanorods of UV conductive ink have the problems of easy agglomeration of silver nanorods , and slow curing speed. In this paper, firstly mace-like silver nanorods with inorganic particles were synthesized by using polycarbonate fibers as soft-templates, AgNO 3 as silver source. The diameters and lengths of silver nanorods were 0.25–0.35 μm and 2.1–5.1 μm. There are many wolf-tooth particles (0.20–0.35 μm) on the silver nanorods which prevented the silver nanorods from reuniting. The obtained silver nanorods were not easy to agglomerate. The minimum resistance value of the coating could reach 1∼10Ω. Secondly, a kind of water-alcohol UV conductive ink with low heat treatment temperature (140 °C), fast drying and curing speed and water-alcohol system was prepared. Water-alcohol soluble P(AA- r -HEMA)- g -GMA was used as the prepolymer , glycidyl triethylenetetraamine hexamethacrylate (TGMA) was used as the monomer , and 907 and ITX were used as photoinitiators. The effects of the types and contents of different photoinitiators (907:1%–5%, ITX: 0.2 %∼1 %), species and contents of prepolymer (30 %∼50 %), the number and content of monomers with different functional groups (30 %∼50 %) on the UV-curing rate were studied. The curing rate was the fastest when the mass fraction of photoinitiator ITX was 0.4 %, the mass fraction of the prepolymer with 30 % GMA content was 50 % and the mass fraction of monomer TGMA was 50 %. The curing speed can reach 2–3 s, and the ink film surface was smooth without bubbles. At last, UV conductive ink was prepared by using the obtained water-alcohol UV curing system as the bonding material and mace-like silver nanorods as the conductive filler . The influence of heat treatment temperature and time on the conductive properties of the coating was explored. The optimal heat treatment temperature was 140 °C, and the heat treatment time was 30 min.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
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IF 8.2
Chuanhui Gao,Picheng Chen,Ying Ma,Luyang Sun,Yuling Yan,Yu Ding,Lishui Sun
Antibacterial packaging used to control the growth of microorganisms in food is of great value for prolonging the shelf life of food. In this study, a bio-based antibacterial agent PDI based on zwitterionic and stereochemical synergistic antibacterial was designed and synthesized, and it was simultaneously introduced into polylactic acid (PLA) matrix with antioxidant o-vanillin (oVL) and plasticizer glycerol (GL). A series of PLA/oVL/PDI composite membranes with antibacterial, antioxidant and anti-ultraviolet properties were prepared by solution casting method. The results showed that the mechanical properties of the composite film were significantly improved compared with pure PLA (tensile strength increased by 37 %, elongation at break increased by 209 %), which was mainly attributed to the microphase separation structure induced by synthetic bio-based antibacterial agent, which improved the mechanical strength of PLA matrix, and the hydrogen bond formed by glycerol, o-vanillin and carbonyl group in PLA molecules plasticized PLA matrix. At the same time, the antibacterial rate of PLA/oVL/PDI composite membrane against Escherichia coli and Staphylococcus aureus can reach >95 %. Packaging experiments showed that PLA/oVL/PDI series composite films could effectively extend the shelf life of fresh bananas and apples for 5 days, and had great application prospects in preservative food packaging.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Ke Wang,Fayong Li,Xiaoyan Sun,Feiyan Wang,Dong Xie,Yen Wei
It is of great significance to develop natural renewable polymer materials for different applications. Herein, the nano-sized hexagonal boron nitride nanosheets (hBNNSs) were facilely exfoliated through liquid-nitrogen, microwave, and ultrasonication treatments, and novel chitosan/hBNNSs (CS/hBNNSs) films were fabricated via solution casting. The obtained transparent CS/hBNNSs films demonstrated outstanding UV shielding ability with 98.51 % UV-A and 96.40 % UV-B lights being resisted. Compared to those properties of CS film, the oxygen permeability (OP) and carbon dioxide permeability (CO 2 P) of CS/hBNNSs films are significantly lowered by 96.35 % and 94.06 %, respectively, which are much better than CS/graphene oxide or other CS nanocomposite films. Moreover, the addition of hBNNSs in CS films also obviously improves their water vapor barrier ability, thermostability , mechanical properties, and antibacterial activity . The CS/hBNNSs films and the strategy developed in this work prove their great prospect in producing high-performance packaging films with desirable excellent UV shielding and oxygen barrier qualities.
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CONSTRUCTION AND BUILDING MATERIALS
·
2023
·
IF 7.4
Wanfu Wang,Shibing Sun,Yan Shi,Wufei Tang,Suping Cui,Dawei Sun,Hui Liu,Hui Wang,Xiaodong Jin
UV curable organic-inorganic hybrid (OIH) coatings were used to modify the extruded polystyrene foam (XPSF) surfaces to increase the bonding strengthen (BS) of XPSF/mortar composite (XMC). OIH coatings contained polyurethane acrylate, hexanediol and nanoparticles with different dimensions. With the addition of nano-SiO 2 and halloysite nanotubes , the BS-D (BS in dry state) & BS-W-2H/7D (BS in wet state after 2-hour/7-day drying) values for modified XMC were increased from 0.050 & 0.039/0.047 MPa to 0.245 & 0.196/0.356 and 0.312 & 0.233/0.323 MPa. The chemical bonding between SiO 2 /-COOH from UV coating and hydration products in mortar improved the bonding state.
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Materials Today Physics
·
2023
·
IF 11.5
Yadong Yu,Ding Weng,Lei Chen,Jiadao Wang
In this study, the effective large-scale deicing based on the interfacial toughness-tuning strategy of an ultraviolet-curable PDMS coating was developed. Methacrylate groups were grafted on the hydroxyl-terminated PDMS molecular chains to endow PDMS the response to UV irradiation. Then the precursor was doped with different proportions of silicon dioxide nanoparticle (SiO 2 NP) to tune the interfacial toughness between the coating and the ice layer. The PDMS coating was fabricated through manual spraying and the polymerization under UV irradiation. The effects of the amounts of the methacrylate groups and SiO 2 NP on the deicing properties of UV-curable PDMS coatings were investigated systematically. In addition, it was found that the large-scale deicing performance of the PDMS coating with 10% SiO 2 NP improved when lowering the ambient temperature, which was mainly related to the increase of the shear modulus and thermal residual stress on the interface and might indicate attractive advantage on the extremely cold environment. Meanwhile, the durability and the adaptability to different substrates of the PDMS coating were also examined for the verification of the possible practical application. In summary, the effective large-scale deicing based on the interfacial toughness tuning of a UV-curable PDMS coating was achieved and the coating showed great potential for practice.
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ACS Applied Materials & Interfaces
·
2023
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IF 9.5
Zhen Wang,Jianping Xu,Shaobo Shi,Jing Chen,Jianghua Xu,Lina Kong,Xiaosong Zhang,Lan Li,Shougen Yin
One-dimensional (1D) metal oxides with excellent carrier transport and light absorption properties can be applied to photodetectors (PDs), facilitating device miniaturization, portability, and integration. Surface modification of 1D semiconductors can reduce carrier recombination in PDs as a way to increase photocurrent and decrease dark current of PDs. Herein, ultrathin BaTiO3 (BTO) shell layers are grown on the surface of TiO2 nanorod arrays (NRs) by in situ conversion using hydrothermal reaction, and the self-powered TiO2-BTO NRs PDs are constructed. The effect of the thickness of BTO shell layers on the photoresponse characteristics of self-powered TiO2-BTO NRs PDs is investigated by controlling the Ba2+ conversion concentration. The results show that the BTO shell layer reduces the dark current of the PDs because of the decreased interfacial transfer resistance and improved transfer of photogenerated carriers for building a “bridge” of carrier transport between BTO and TiO2 due to the formation of Ti–O–Ti bonds. Moreover, the presence of the spontaneous polarization electric field in BTO enhances the photocurrent and response speed of PDs. The self-powered TiO2-BTO NRs PDs are integrated in series and parallel to realize the functions of “and” and “or” gates of light-controlled logic gates. The ability to convert light signals into electrical signals for the self-powered PDs in real time demonstrates its great potential for optoelectronic interconnection circuits, which has important application prospects in the field of optical communication.
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Chemical Engineering and Processing-Process Intensification
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2023
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IF 4.3
Yu Zhong,Kama Huang,Nanya Zhong,Yijun Wang,Wenqi Chen
The traditional cathode low-pressure Hg lamp is the most mainstream UV light source in degrading organic wastewater but with significant limitations of short lifetime, environmental hazard and poor degradation efficiency. Here, we evaluate a self-designed microwave-driven ZnI 2 deep-UV lamp on degrading Rhodamine B (RhB), methylene blue (MB), and p-nitrophenol (PNP). An electrodeless Hg lamp was used as control. First we investigated the emission wavelength, spatial radiation distribution, the effect of power on radiation intensity, and relative permittivity of ZnI 2 lamp. Then the degradation rate, kinetics and energy yield on degrading RhB, MB and PNP as well as the cost were studied. ZnI 2 lamp showed shorter wavelengths, approaching UVC radiation intensity, approaching attenuation factor and higher microwave coupling capability to Hg lamp. After treatment with ZnI 2 lamp for 10, 6 and 15 min, 5 mg/L of RhB, MB and PNP can reach 100% removal rates. Moreover, higher degradation rate and kinetic constants of ZnI 2 lamp for 3 compounds than the Hg lamp in this paper and in the literature were achieved. With the assistance of microwave and properties of environmental-friendly and low cost, ZnI 2 lamp provides a new alternative to traditional Hg lamp and wastewater photochemical treatment method.
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Environmental Science-Water Research & Technology
·
2023
·Vol. 9
·期 7
·1932-1943
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IF 5
Chen-Yan Hu,Dan-Dan Huang,Yi-Li Lin,Qiang-Bing Wang,Ling Xu,Zi-Yi Dong,Yi-Hui Wu,Sheng-Jie Ji
This study novelly reported the degradation kinetics and the correlated formation of disinfection by-products (DBPs) of metribuzin, a widely used herbicide that contains nitrogen, in the UV/chlorine process. The influencing factors, including chlorine dosage, pH, and the presence of chloride (Cl−) and natural organic matter (NOM, simulated using humic acid (HA)) in water for metribuzin degradation were evaluated. The pseudo-first-order rate constant (kobs) of metribuzin during UV/chlorination was calculated to be 0.0986 min−1, which was 6.90 times higher than those of UV-alone and 1.53 times greater than that of chlorine-alone. The kobs increased with increasing chlorine dosage and decreasing pH value. Cl− could promote the degradation of metribuzin, while the content of metribuzin changed non-monotonically with HA concentration. Through the establishment of the kinetic model, the kobs of HO• with metribuzin was calculated to be 5.6 × 109 M−1 s−1, and HO• contributed to 20% of metribuzine degradation. The possible degradation pathways of metribuzin in the UV/chlorine process were proposed. In the sequential chlorine disinfection process, trichloromethane (TCM) was the dominant DBP in non-bromine water, while the content of tribromomethane (TBM) raised with increasing molar ratio of bromine to chlorine, which has to be carefully controlled in drinking water treatment plants to provide safe drinking water to the public.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Yuanlong Guo,Yang You,Gu Guo,Zixiang Chen,Wei Peng,Lijie Hu,Songmiao Liang,Haibo Xie
Herein, a serial of full cellulose and lignosulfonate derivatives (LS), including sodium lignosulfonate (LSS), calcium lignosulfonate (LSC), lignosulfonic acid (LSA), composite films were generated through dissolving cellulose in reversible carbon dioxide (CO 2 ) ionic liquids solvent system (TMG/EG/DMSO/CO 2 solvent system), followed by a facile solution-gelation transition and absorption strategy. The findings indicated that LS aggregated and embedded inside the cellulose matrix via H-bond interaction. The cellulose/LS derivatives composite films showed good mechanical properties which the tensile strength reaches the maximum value of 94.7 MPa in MCC3LSS film. While for the MCC1LSS film, the breaking strain increases to 11.6 %. The outstanding UV shielding effect and high transmittance in the visible region of composite films were also achieved and the shielding performance of the whole UV region (200–400 nm) tended to 100 % for MCC5LSS film. In addition, thiol-ene click reaction was selected as model reaction to verify the UV-shielding performance. It was also found that the oxygen and water vapor barrier performances of composite films were evidently associated with the intense H-bond interaction and tortuous path effect. The OP and WVP of MCC5LSS film were 0 and 6 × 10 −3 g·μm/m 2 ·day·kPa, respectively. These outstanding properties make them with great potential for packaging field.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Chen Ling,Chaolin Li,Aiping Liang,Wenhui Wang
Microplastics (MPs) pose a severe threat to the environment and human health, and effective treatment techniques are urgently desired to prevent the global spread of MPs pollution. However, efficient degradation of MPs remains difficult. Herein, vacuum ultraviolet (VUV) activated peroxymonosulfate (PMS) was firstly proposed as a promising technique for the degradation of polyethylene MPs. The weight loss of MPs reaches as high as 51.5% under mild conditions ([PMS] = 32 mmol/L, initial pH = 7, [MPs] = 1 g/L, [Time] = 48 h), which is the record performance achieved at room temperature and ambient pressure for MPs degradation. The excellent degradation performance is uncovered to originate from the synergistic effect of VUV and activated PMS. Direct photolysis of VUV can rapidly oxidize the surface of MPs to reduce its hydrophobicity and thus enhance the adsorption of reactive oxidation species (i.e., SO 4 ⋅− and HO ⋅ ) rooted from the VUV activated PMS, which was further confirmed by DFT calculations. The degradation of MPs repeatedly undergoes the process of VUV photolysis oxidation of the surface, degradation via VUV/UV/PMS-derived reactive oxidation species, shedding, and re-exposure of the new surface via VUV photolysis oxidation. This study highlights the unique role of the VUV photolysis in MPs degradation, paving a new route for designing practical MPs pollution remediation techniques.
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PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Jinke Wang,Lingwei Ma,Xiaolun Ding,Haowen Xu,Yue Wang,Miao Zhao,Chenhao Ren,Dawei Zhang
In this study, a robust coating with enhanced corrosion resistant and weathering resistant properties was developed by incorporating novel UV resistant fillers into epoxy matrix. Tea polyphenol (TP) functioned as the free radical scavenger, which was encapsulated into mesoporous silica nanoparticles with UV absorption ability (MSN-TP) to obtain the UV resistant filler. With the incorporation of 2 wt% MSN-TP fillers in the epoxy matrix, the uniform distribution of MSN-TP nanoparticles could block the penetration of corrosive media and hence strengthening the barrier property of the coating. Moreover, the free radical scavenging ability of TP and the UV shielding effect of MSN functioned simultaneously to alleviate the weathering degradation of epoxy coating, which exhibited stabilized surface properties (including macro and micro morphology, FTIR , CLSM , gloss, and WCA) and good barrier performance during accelerated weathering exposure test. Such a robust EP/MSN-TP coating can considerably prolong the long-term protection during outdoor service life.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yiqun Chen,Baitian Zeng,Liying Long,Qing Shao,Zizheng Liu,Feng Wu,Pengchao Xie
The ultraviolet/persulfate (UV/PS) process has attracted more and more attention for water treatment. However, it runs the risk of producing bromate in the presence of bromide ions. In this work, we propose a new strategy using sulfite to inhibit bromate formation. The results show that the addition of sulfite significantly reduced the formed bromate in the UV/PS system by 61.2% and 24.5% in 30 min and 120 min, respectively. Increasing sulfite dosage or pH could enhance bromate control. From the standpoint of reaction kinetics, sulfite is likely to inhibit bromate formation by reducing bromine radicals (Br ) back to bromide ions, the energy profile of which was quantified by density functional theory (DFT) calculations. In the UV/PS/sulfite system, the conversion of SO 3 − to HO was observed, indicating that sulfite also served as a source of reactive radicals. Moreover, sulfite apparently promoted the degradation of benzoic acid and phenol in a UV/PS system, showing advantages over other inorganic reductants. As a result, we discovered that sulfite could not only help control bromate formation in UV/PS but also improve the system’s oxidation capacity.
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