COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Xiaojin Liu,Ting Li,Chenxi Hu,Yang Wang,Guanglong Li,Weifu Dong,Jinliang Qiao
Overexposure to ultraviolet (UV) light can pose a threat to human health and lead to the photodegradation of organic materials, thereby there is great interest in the development of UV-shielding and UV-to-visible light converting materials. In this study, a novel polymer microsphere with both UV-shielding and blue-light-emitting characteristics was fabricated by grafting disodium 4,4′-bis[(4-anilino-6-hydroxyethylamino-1,3,5-triazin-2-yl) amino] stilbene-2,2′-disulphonate (VBL) onto poly (maleic anhydride-co-α-methyl styrene) (PMAS) microspheres via an esterification reaction. The as-prepared PMAS-VBL microspheres were then incorporated into polyvinyl alcohol (PVA) to prepare composite films . The introduction of PMAS-VBL endowed PVA with excellent UV-shielding and fluorescent properties, which are mainly derived from the UV-to-blue light converting ability of VBL. PVA films containing 7 wt% PMAS-VBL microspheres can block almost 100% UV light while the visible light transmittance was maintained at 66.9% and the absolute quantum yield of the films reached up to 74.26%. This work opens up a new pathway for fabricating UV filters and blue light converters, which are very promising for a diversity of UV-shielding and fluorescence-based applications.
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PROGRESS IN ORGANIC COATINGS
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2023
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IF 6.6
Jie Wang,Changzhou Gao,Jiaojiao Fang,Liang Fang,Chunhua Lu,Zhongzi Xu
Light and heat management in greenhouses are important for crops yield and quality. Here, we created waterborne polyurethane (WPU) composite coatings for greenhouse films, which can act both as ultraviolet (UV) light down-conversion and directional infrared light barrier for the light and temperature conditions in pepper greenhouses. Rare-earth organic complexes (REOC) that can convert UV light to red light were mixed with WPU by ball-milling. The REOC nanoparticles presented good dispersion in WPU coatings, which were determined by atomic force microscopy , and the coating with 1 wt% REOC still remained comparably high transparency. The luminescence properties were increased with REOC loadings. The coatings with REOC showed lower infrared (IR) light transmittance and higher IR light reflectance than those of the pristine film and WPU coatings. The preferable location of the composite coatings on inner side of films acted as IR light barrier and facilitated the maintenance of heat inside the greenhouses, increasing the temperature. Simulation was performed to testify the temperature increase using IR barrier covered layer. Small and big greenhouses with different films were built and the temperatures were recorded. The results show that the film containing REOC increase the temperature in the greenhouses by >2 °C compared to traditional agricultural films. Finally, due to light conversion and IR light barrier, the yields of green peppers can be increased by 35 %. The mass of single fruits can also be increased by 8 g.
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Materials Research Express
·
2023
·Vol. 10
·期 4
·045303
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IF 2.3
Chengqi Yan,Junyue Chen,Zhuying Jia,Zhanjun Li
Hydrogels have similar structural and functional properties to natural articular cartilage, so they have been widely used in the research of biomimetic articular cartilage. In this research, polyvinyl alcohol (PVA) and betaine monomer were used as raw materials to prepare hydrogel on polyetheretherketone (PEEK) surface by Uv light molding and casting molding respectively. The results showed that two methods were used to prepare hydrogel film on PEEK surface successfully. The diameter of the internal hole of the hydrogel prepared by Uv light molding was larger than that prepared by casting molding. Compared with the hydrogels prepared by Uv light molding, the hydrogels prepared by casting molding have a lower friction coefficient because of their high load-carrying capacity. Different preparation methods seriously affect the formation of hydrogel structure. This study provides an important reference value for the preparation of high performance hydrogels.
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ACS Applied Polymer Materials
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2022
·
IF 4.855
Xu Yang,Hong Zhao,Chunyang Li,Xindong Zhao,Jiaming Yang,Xuan Wang
Polypropylene (PP), as a recyclable thermoplastic polymer, is a promising insulating material for application as an environmentally friendly insulation layer in high-voltage-direct-current (HVDC) cables. However, the lack of toughness and the poor wide-temperature-range electrical properties under a DC electric field seriously restrict its development and application. Herein, a block polypropylene with a low elastic modulus is selected and grafted with organic molecules of maleic anhydride (MAH) and 4-tert-butylstyrene (St*) as a masterbatch (PP-g-(St*-co-MAH)) by an ultraviolet-irradiated radical reaction. The modified b-PP with different grafting contents was prepared by diluting the masterbatch through melt blending, and their DC electrical properties at a wide temperature range of 40–100 °C were tested. The results indicate that the introduction of a comonomer St* significantly improves the grafting rate of MAH and suppresses the degradation of PP chains during the grafting reaction; thus, the PP-g-(St*-co-MAH) possesses improved thermogravimetric performance and maintains the original mechanical properties and workability. The grafted functional groups introduce deep charge traps into the matrix and thus effectively suppress the space charge injection and accumulation, significantly reduce the conductivity, and enhance the breakdown strength of PP at wide temperature ranges. Among the tested materials, the PP grafted with 0.57 wt % St*-co-MAH exhibits the best electrical properties, while inadequate or excessive grafting content of St*-co-MAH relatively weakens the positive effects of grafting modification. The mechanism is analyzed based on calculation of the trap level and the three-dimensional (3D) electric potential.
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Drug Research
·
2023
·Vol. 73
·期 06
·335-340
·
IF 2.2
Guo Haihua,Zhang Rui,Deng Liangjun,Li Meng,Li Sha,Zhao Suqing
Background Inhalation preparation involves liquid or solid raw materials for delivering to lungs as aerosol or vapor. The liquid preparation for nebulizer is effective for convenient use and patient compliance and it has been extensively used in the treatment of clinical lung diseases. Clinical staff often mixes the compound ipratropium bromide with beclomethasone propionate and budesonide inhaler but reference values of inhalants for clinical use need to be established for simplifying the operation procedure. The high-performance liquid chromatography (HPLC) method of compound ipratropium bromide solution, beclomethasone propionate suspension and budesonide suspension after mixed atomization was studied. Methods The specificity, linearity, recovery (accuracy), precision and stability of compound ipratropium bromide, beclomethasone propionate and budesonide were tested to verify the developed liquid phase method. Results The developed liquid phase method had high specificity, linear R2≥0,999, recovery (accuracy) RSD (relative standard deviation) less than 2%, precision RSD less than 2,0%, and stability RSD less than 2,0%. Conclusion The liquid phase methodology developed in this study can be used for the determination of compound ipratropium bromide mixed with beclomethasone propionate and budesonide. The current methodology can also be used to provide a reference for the determination of its content after mixing, and further data support for its clinical medication.
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高影响因子
ACS ES&T Water
·
2023
·
IF 5.3
Hui Huang,Lili Jin,Jun Hu,Yanru Wang,Hongqiang Ren
Total nitrogen (TN) and steroid estrogens (SEs) in secondary effluent challenge widely used denitrification biofilter (DNBF) in achieving the regulated limit value in water reuse, as well as toxicity reduction. Herein, we first use UV/peracetic acid (PAA) as a pretreatment of DNBF for advanced wastewater treatment, followed by an evaluation of its effectiveness in removing TN and SEs from low C/N wastewater. The results showed that UV/PAA-biofilter significantly improved the removal of TN and SEs compared to conventional DNBF. Under the conditions of [PAA]0 = 15 mg/L, UV = 1250 μW/cm2, photoreaction time of 30 min, and biofilter hydraulic retention time (HRT) = 3 h, the SE removal rates could reach more than 95% and the effluent TN maintained less than 10 mg/L. Furthermore, UV/PAA-biofilter improved the reduction of estrogenic activity but not of acute toxicity. Increased extracellular polymeric substance (EPS) content and relative abundance of napA gene were observed in DNBF pretreated with UV/PAA, and Azospira was identified as the core microorganism for denitrogenation. Our investigations confirmed the feasibility of the UV/PAA-biofilter to remove SEs and TN simultaneously, highlighting the great potential of its application in the advanced purification of secondary effluent for safe wastewater reuse.
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Sustainable Energy & Fuels
·
2023
·Vol. 7
·期 4
·986-995
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IF 5.6
Pengcheng Zhou,Yuxian Liu,Jian Chen,Shouqiang Lu,Huiyang Li
The replacement of flammable electrolytes with non-flammable electrolytes is the ultimate solution for addressing the safety concerns related to lithium-ion batteries. In this context, inorganic/polymer composite electrolytes (IPCEs) offer the advantages of high flexibility, stability, ionic conductivity, and interfacial compatibility and therefore have received growing research attention. Herein, a novel IPCE based on a Norland optical adhesive (NOA81) and a Li-rich fast ion conductor Li10.7Al0.24La3Zr2O12 for quasi-solid-state lithium-ion batteries was designed and synthesized via solvent-free in situ ultraviolet (UV) curing. In this system, polyethylene oxide and poly(vinylidene fluoride-co-hexafluoropropylene) were used to modify the polymers, and sebaconitrile was used as a plasticizer. Screen printing was also employed during the manufacturing process. The composite electrolyte displayed a lithium-ion conductivity of 1.3 × 10−4 S cm−1 at 25 °C and sustained good stability up to 5.43 V (vs. Li+/Li). Lithium-ion batteries fabricated using the composite electrolyte, a LiNi1/3Mn1/3Co1/3O2 (NMC111) cathode, and a Li4Ti5O12 (LTO) anode achieved a specific capacity of 128 mA h g−1 and exhibited an 80% capacity retention after 154 cycles at 0.2C under testing at 25 °C. In addition, this battery exhibited an extremely high coulombic efficiency (>99.5%) over its entire cycle life. The NMC111 loading in the cathode reached 11.7 mg cm−2, which is comparable to those of commercialized electrodes. Significantly, the battery retained excellent electrochemical performances over a wide temperature range from 25 to 100 °C and achieved the highest specific capacity of 143 mA h g−1 at 45 °C.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Ziwei Liu,Shan Chen,Ye Wan,Xin Miao,Qunchao Zhang,Tao Jiang,Cheng Zhang,Xianwu Cao,Tonghui Hao
Restricted by the poor solubility and complex structure, it remains a significant challenge to efficiently convert raw peach gum (RPG), a natural plant gum comprised of polysaccharides, into usable polymer materials. Herein, a novel approach is reported to prepare UV-responsive peelable pressure-sensitive adhesives (PSAs), which are mainly applied in the manufacturing of ultrathin electronics, through efficient utilization of RPG via prior dissolution using the N,N -dimethylacetamide/lithium chloride (DMAc/LiCl) solvent system and later degradation using H 2 O 2 under UV light at room temperature. With sorbitol-based polyurethane acrylate (SPUA) as a UV-curable oligomer, rosin as a tackifier, and epoxidized soybean oil (ESO) as a plasticizer, before UV irradiation, the 180° peel strength of the prepared PSAs reached 244.4 N/m. A short period of UV irradiation caused a formed cross-linked network structure inside the PSA and a disruption of the adhesive interface, resulting in a sharp decrease of 180° peel strength to 7.3 N/m to achieve a non-destructive peeling of the adherend electronics from the carrier. This work provides a feasible strategy for efficiently utilizing natural peach gum to prepare bio-based UV-responsive peelable PSAs.
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Foods
·
2023
·Vol. 12
·期 14
·2794
·
IF 5.2
Shushan Gao,Chonghao Zhu,Liangfei Ma,Chenghai Liu,Hongqiong Zhang,Shengming Zhang
To reduce the usage of petroleum-based plastic products, a lignin-based film material named aminated lignin/Fe(III)/PVA was developed. The mixture of 8 g lignin, 12 mL diethylenetriamine, 200 mL NaOH solution (0.4 mol·L−1), and 8 mL formaldehyde was heated at 85 °C for 4 h; after the aminated lignin was impregnated in the Fe(NO3)3solution, a mixture of 3 g aminated lignin/Fe(III), 7 g PVA, and 200 mL NaOH solution (pH 8) was heated at 85 °C for 60 min; after 2 mL of glycerin was added, the mixture was spread on a glass plate to obtain the aminated lignin/Fe(III)/PVA film. This film demonstrated hydrophobicity, an UV-blocking function, and a good slow-release performance. Due to the formation of hydrogen bonds between the hydroxyl groups of lignin and PVA, the tensile strength, the elongation at break, and the fracture resistance of the film were 9.1%, 107.8%, and 21.9% higher than that of pure PVA film, respectively. The iron content of aminated lignin/Fe(III)/PVA was 1.06 wt%, which mainly existed in a trivalent form. The aminated lignin/Fe(III)/PVA film has the potential to be used as a food packaging material with anti-ultraviolet light function and can also be developed as other packaging materials, such as seedling bowls, pots for transplanting, and coating films during transport.Keywords:lignin;polyvinyl alcohol;Fe(III);packaging material;slow-release function
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高影响因子
ACS Omega
·
2023
·
IF 4.1
Xinwei Jiang,Julin Yuan,Zhijie Zheng,Yufang Tao,Xiaogang Wu
This study evaluated the effects of ultraviolet (UV) photolysis combined with electrochemical oxidation on sulfonamides (SAs) as well as its treated effluent on the bacterial community in surface water. In terms of degradation rate, the best anode material for electrochemical oxidation was Ti/RuO2–IrO2, which had the highest degradation kinetic constant compared to Ti/Ta2O5–IrO2 and Ti/Pt. Experiments showed the highest degradation rate of SAs at 8.3 pH. Similarly, increasing the current leads to stronger degradation due to the promotion of free chlorine production, and its energy consumption rate decreases slightly from 73 to 67 W h/mmol. Compared with tap water, the kinetic constants decreased by 20–62% for SAs in three different surface water samples, which was related to the decrease in free chlorine. When extending the reaction time to 24 h, the concentrations of chemical oxygen demand and total organic carbon decreased by approximately 30–40%, indicating that the SAs and their products could be mineralized. The diversity analysis showed that the effluents influenced the richness and diversity of the bacterial community, particularly in the 4 h sample. Additionally, there were 86 operational taxonomic units common to all samples, excluding the 4 h sample; significant differences were derived from changes in the Actinobacteriota and Bacteroidota phyla. The toxicity of the products might explain these changes, and these products could be mineralized, as observed in the 24 h sample. Therefore, the extension of treatment time would greatly reduce the ecological harm of treated effluent and ensure that the UV/electrochemical process is a feasible treatment option. Overall, this study provides valuable insight into the optimization and feasibility of UV/electrochemical processes as a sustainable treatment option for sulfonamide-contaminated water sources, emphasizing the importance of considering ecological impacts and the need for extended treatment times that address environmental concerns and ensuring improved water quality.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Xiangrui Bu,Kunfeng Ding,Qiang Wu,Yubin Yuan,Weihua Liu,Chuanyu Han,Xiaoli Wang,Xin Li
As an n-type metal oxide semiconductor (MOS), vanadium pentoxide (V 2 O 5 ) has shown great potential in gas sensing, especially for the detection of NO 2 . Herein, a highly sensitive NO 2 sensor based on 3D porous V 2 O 5 microrods (MRs) derived from metal organic frameworks (MOFs) was reported. The porous structure of vanadium-based MOF-derivatives (MIL-47) was tuned by the control of annealing temperature (300 °C–600 °C) in the pyrolysis process . The gas sensors with the MOF-derivatives are exposed to NO 2 at 150 ℃ for gas sensing tests. The sensor with MOF-derivatives annealed at 500 °C (MIL-47–500) showed the highest response (527 %) to 50 ppm NO 2 . It also showed excellent selectivity, low limit of detection, and good repeatability. The NO 2 -sensing behaviors of the MIL-47–500 sensor under ultraviolet (UV) illumination have also been investigated. Under UV illumination, the response of the MIL-47–500 sensor increased to 706 %. At 75 °C, the response of the MIL-47–500 sensor toward 50 ppm NO 2 was significantly improved from 57 % to 538 % under UV illumination. The response/recovery times were reduced from 102 s/300–48 s/178 s. The excellent performance was attributed to the unique porous structure of MIL-47–500 and the UV light excited charge carriers.
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COMPOSITES SCIENCE AND TECHNOLOGY
·
2023
·
IF 9.1
Shengtao Dai,Fei Yan,Jiaming Guo,Mingxin Li,Yanan Zhao,Yu Liu,Liu Liu,Yuhui Ao
On account of environment concerns and the gradually depletion of fossil resources , a hyperbranched waterborne polyurethane (HWPU) serving for sizing agent of carbon fibers (CF) was designed based on bio-based materials. Hyperbranched chain extender named CAG was synthesized by citric acid (CA) and glycerol as HWPU precursor. Tartaric acid (TA) was coordinated with nano titanium dioxide (TiO 2 ) through two –COOH groups, which was introduced to HWPU as the chain extender, leading to a significant improvement in ultraviolet (UV)-resistant of the sizing agent. The interfacial performance promotion of CF reinforced nylon 6 (CF/PA6) composites contributed by the HWPU sizing agent were systematically investigated. In contrast to the untreated CF composites , the mechanical performance arrived the best improvement after sizing by concentration of 1.5 wt%, which exhibited a dramatic promote of 44.9% in interlaminar shear strength (ILSS), 58.7% in interfacial shear strength (IFSS) and 43.3% in flexural strength . Extraordinary, the treated CF composites remained over 98% of mechanical performance after a week of unremitting ultraviolet irradiation, signifying the outstanding UV-resistance of the TiO 2 modified HWPU sizing agent.
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危险品化学品经营许可证（带存储）