APPLIED CLAY SCIENCE
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2023
·
IF 5.6
Yan Qin,Weihua Su,Guihua Meng,Lin Cui,Jianning Wu,Shengchao Yang,Zhiyong Liu,Jichang Liu,Xuhong Guo
Photodegradation and the low retention rate of pesticides on crop leaves seriously affect their utilization rate. Regarding this problem, we have developed an anti-ultraviolet and high-adhesion pesticide carrier based on halloysite nanotubes (Hal) and was loaded with chlorpyrifos (CPF). By grafting polyethylenimine (PEI) and protocatechuic acid (PCA) onto Hal, PEI- g -Hal (pH) and PCA- g -(PEI- g -Hal) (PPH) were obtained. Load CPF into the cavity of PPH by negative pressure to obtain PPH @ CPF. Its structure and morphology were confirmed by TEM , XPS, FT-IR, zeta potential , TG and XRD , etc. The results indicated that the retention rate of PPH@CPF on cotton leaves was 74.33%, estimated as 1.8 times more efficient than that of PH@CPF. The fluorescence intensity of PPH@FITC was better than that of PH@FITC after 5 times of simulated rain wash. With the decrease in pH, the amino group was protonated gradually, PPH@CPF hydrophilicity was enhanced, and the release rate of PPH@CPF increased gradually. At pH = 5–7 (roughly the same as the pH environment on the leaf surface), PPH@CPF has a faster initial rate and a longer sustained release period than in other pH environments. The photodegradation rate of PPH@CPF was 70% after 24 h, which was much lower than the original CPF. The high adhesion and UV-shielding properties of organic modified Hal played a positive role in reducing the photodegradation and improved the retention rate of pesticides on the crop leaf surface, thus having an extensive significance in crop protection and environmental protection.
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ACS Applied Polymer Materials
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2023
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IF 5
Gang Wang,Zhengxiang Zhou,Mengyu Chen,Juanjuan Wang,Yingfeng Yu
Optically clear pressure-sensitive adhesives (PSAs) face the challenges presented by a range of electronic and touch screen applications. Although many efforts have been made to manipulate the optical and adhesion properties of ultraviolet (UV)-curable acrylate-based PSAs, further application and large-scale production are still limited owing to the intrinsically poor processability that stems from the large content of the high-vinyl-equivalent and low-viscosity acrylic monomers. Introducing a low-vinyl-equivalent and high-viscosity polyurethane acrylate (PUA) prepolymer into the formulation is a facile method to solve this issue without sacrificing the transparency. In this study, a series of PUA prepolymers are prepared to construct the model of PUA-co-2-ethylhexyl acrylate (2EHA), denoted as poly(PUA-2EHA). The influence of PUA prepolymer architectures (average functionality and molecular features) on the optical and adhesion properties is elaborately discussed. The chemical cross-linking-induced enhancement of the haze values of PUA-based PSAs is investigated for the first time. Moreover, an improved and uniform bright image display without blemish, which is usually called the Mura defect-free image display in the industrial field, is obtained by using poly(PUA-2EHA) as the optically clear adhesive for full lamination of the thin-film transistor liquid crystal display (TFT-LCD) module. The laminated TFT-LCD module could be disassembled easily without leaving the residue on the screen. These results provide clear design guidelines to regulate the properties of PUA-based PSAs, which are especially valuable for the large-scale industrial production of UV-cured PSAs and facilitate the development of display technologies.
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Nano Research
·
2023
·Vol. 16
·期 5
·7810-7819
·
IF 9.9
Zheng Nan,Liu Jie,Wang Guoqing,Yao Pan,Dang Lihong,Liu Ze,Lu Jiufu,Li Wenge
Polydimethylsiloxane containing methacryloyloxy and methoxy silane groups (MAPDMS)-microcapsule-SiO 2 (MPMS) functional materials were prepared by constructing micro-nano hierarchical structures on the surface of MAPDMS matrix. Herein, MAPDMS@1,1-stilbene-modified hydrolyzed polyglycidyl methacrylate/graphene oxide/dimethyloctadecyl[3-(trimethoxysilyl) propyl]ammonium chloride (MAPDMS@PGMA m /GO/QC18) self-healing microcapsules with compact multi-shell structure were synthesized and combined with nano-SiO 2 to construct the hierarchical structures. Furthermore, ultraviolet (UV)/moisture dual curing mode was introduced into deep curing reaction and efficient self-healing reaction of the MPMS. The results show that the introduction of UV/moisture dual curing mode and micro-nano hierarchical structure gives MPMS functional materials excellent mechanical properties, antifouling properties, self-healing properties, and antibacterial properties. The shear strength and tensile strength of MPMS increase from 3.32 and 4.26 MPa of MAPDMS to 3.81 and 5.06 MPa, respectively. Its static contact angle increases from 115.9° of MAPDMS to 156.5°, and its slide angle decreases from 68.5° of MAPDMS to 7.8°, respectively. The antifouling performance of MPMS against seawater, soy sauce, juice, coffee, protein, and other contaminants is effectively improved compared with MAPDMS matrix. At the same time, the tensile strength and elongation at break of MPMS after healing reach 98.22% and 96.57% of those in original state, respectively. In addition, the antibacterial rates of MPMS against Escherichia coli and Staphylococcus aureus reach 99.85% and 100%, respectively. The MPMS prepared in this paper is expected to be widely used in marine antifouling, pipeline network, anti-icing, microfluidics, wearable devices, medical devices, electrochemical biosensors, and other fields.
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PROGRESS IN ORGANIC COATINGS
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2023
·
IF 6.6
Shuai Zhang,Kuanjun Fang,Xiuming Liu,Meilin Cheng,Dongdong Liu,Xiran Qiao,Jinkun Wang
The construction of multifunctional colored cotton fabrics still faces significant challenges that dramatically limit the application of dyed fabrics in multiple fields. This report presented a simple and effective method for creating multifunctional colored cotton fabrics with hydrophobic, UV-resistant, and antibacterial properties. This was achieved by applying Metal-organic frameworks (MOF)/composite colored nanospheres and polymethylhydrosiloxane (PMHS) via a spray-on process. Firstly, ZIF-8/disperse dye nanospheres (ZIF-8@DPAN) with uniform diameter and dispersion stability were synthesized, which could effectively prevent the leakage of dispersed dyes. The ZIF-8@DPAN had excellent color properties, enabling direct spray and bonding to cotton fabrics by electrostatic gravitational force. The colored cotton fabric that was obtained exhibited outstanding performance, boasting a hydrophobic angle of 142°, a UPF value exceeding 400, and an antibacterial rate of over 94 %. Furthermore, the colored cotton fabric boasts remarkable durability against washing and rubbing, ensuring its longevity and resistance to wear and tear. Therefore, the synergistic effect of functionalized colored nanoparticles ZIF-8@DPAN and PMHS offers a facile and feasible method for fabricating of multifunctional dyed textiles.
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PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Lin Li,Zhenpeng Zhang,Minhui Wang,Yanan Zhang,Xun Lu
Photo-curing coating has the advantages of environmental friendliness, short curing time, high productive efficiency and low energy consumption. However, it is also a challenge to overcome the weakness of brittleness , water vapor damage and repairing difficulty. Herein, we have prepared a flexible and self-healing epoxy acrylic coating by introducing dynamic disulfide bond and dangling chain into the resin system, furthermore, sprayed nano-SiO 2 to construct the micro surface structure to endow the coating with super-hydrophobicity. The introduction of dynamic disulfide bond has endowed the coating with self-healing ability, while the diluent as dangling chain has promoted the mobility of molecular chain, more importantly, which not only improved the self-healing efficiency of the coating, but also reduced the brittleness, three birds with one stone. Moreover, silane coupling agent was used to modify the nano-SiO 2 particles to enhance the abrasive resistance of the coating. The coating exhibits outstanding comprehensive performance: the water contact angle can reach 155°, the self-healing efficiency can reach 97 %, wear-resistance greatly increases by 40 %. These results are expected to provide some references for developing UV-curable coating with high performance.
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DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 17
·5798-5803
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IF 4
Lehui Liu,Feifei Yuan,Yisheng Huang,Zhoubin Lin,Lizhen Zhang
The [B3O6] group has attracted a lot of attention as α-BaB2O4 (α-BBO) is composed of the [B3O6] group showing a short UV cut-off edge and a large birefringence. However, it is difficult to synthesize novel crystals with properties beyond α-BBO using [B3O6] as a fundamental building block (FBB). Hence, we successfully synthesized two cases of α-BBO-type organic–inorganic hybrid compounds using α-BBO as the template and melamine [C3N6H6] as the fundamental building block. The coplanar and parallel arrangement of π-conjugated [C3N6H6] groups makes them exhibit excellent optical properties, including improved birefringence responses (0.264 and 0.243@546 nm) and wide bandgaps (4.12 and 4.20 eV).
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Food Additives and Contaminants Part A-Chemistry Analysis Control Exposure & Risk Assessment
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2022
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IF 3.549
Yike Han,Ziang Zhou,Zihan Cao,Wei Zong,Guangyuan Zhao,Xiaoyuan Wang
Alternariol (AOH) and alternariol monomethyl ether (AME) are two Alternaria mycotoxins with high occurrence rates in food systems. This study aimed to investigate the photodegradation of AOH and AME by ultraviolet-C (UV-C) irradiation. The effect of UV-C intensity, pH, treatment time, solvents and the exposure of food components were evaluated. After treated by UV-C irradiation at 3500 μW/cm2 for 90 min, AOH samples in methanol, aqueous solution and solid state were degraded by 89.1%, 72.9% and 53.2%, respectively, while the degradation percentages of AME were 86.6%, 50.1% and 11.1%, respectively. Increasing irradiation intensity and prolonging irradiation time could significantly facilitate the degradation of AOH and AME. An alkaline environment (pH = 11) was more conducive to the degradation of toxins. In addition, 2.5 mg mL−1 citric acid or malic acid increased the photodegradation of AOH and AME to 94.6% and 95.3%, 93.2% and 70.5%, respectively. However, protein, polyphenols and vitamin C exerted inhibitory effects on the degradation, while 10% glucose or sucrose reduced the photodegradation of AOH and AME to 65.9% and 40.3%. UV-C treatment could effectively reduce the content of AOH and AME, with the highest efficiency achieved in methanol and alkaline environment. By contrast, UV-C irradiation is more effective in degrading toxins in some liquid foods rich in organic acids but lacking in protein. The utilization of UV-C radiation appears to be a potentially useful approach for decreasing the underlying risk of Alternaria mycotoxin contamination in foods.
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Advanced Optical Materials
·
2022
·Vol. 11
·期 5
·2202248
·
IF 10.05
Neng Hu,Di Gao,Xin Cai,Lin Lei,Weijia Wang,Huiqing Fan,Peter Müller-Buschbaum,Qi Zhong
Inspired by the lady costume from Tang Dynasty, printable tattoos are prepared from hybrid nanogels to monitor ultraviolet (UV) radiation from sunshine. The hybrid poly(di(ethyleneglycol) methylether methacrylate- co -poly(ethylene glycol) methylethermethacrylate) nanogels containing graphitic carbon nitride (g-C 3 N 4 ) nanosheets, abbreviated as hybrid P(MA- co -MA 300 )/g-C 3 N 4 nanogels, are prepared by precipitation polymerization. Due to the excellent photocatalysis of the g-C 3 N 4 nanosheets, the dyed hybrid nanogels can be rapidly photodegraded under sunshine. Based on the linear correlation between the discoloration of dyed hybrid nanogels and the dose of solar radiation, the UV radiation from sunshine can be simply monitored by checking the color in real-time. By applying different types of dyes, the hybrid nanogels even can be used to trace the dose for the synthesis of vitamin D, induction of erythema and risk of skin cancer simultaneously. Favored by the stickiness of acrylate-based polymers, the hybrid nanogels can be printed to the body as tattoos to realize decoration and UV detection. By simply switching the template for printing, the tattoo patterns can be easily changed according to personal interests and applied position on the human body. Therefore, the present hybrid nanogels can be a promising candidate to monitor the solar radiation dose and decorate the human body.
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Ying Lv,Siting Fan,Yujie Zhao,Yu Liu,Xiaohang Zhang,Jie Zhao,Jian Yu
Single-component white phosphor is highly desirable to obtain efficient and stable white light-emitting diodes (w-LED). In this paper, a series of Bi 3+ , Tb 3+ , and Eu 3+ doped Ca 3 LuAl 3 B 4 O 15 (CLAB) luminescent materials were successfully prepared. The structure, morphology, and optical properties of samples were characterized by X-ray diffractometer, scanning electronic microscopy, and fluorescence spectroscopy , respectively. The synthesized phosphor exhibits strong blue band emission from Bi 3+ and intense characteristics line emission from Tb 3+ and Eu 3+ under ultraviolet (UV) light excitation. The emission color can fine be adjusted by changing the doping content of the three activators. The warm white light of CLAB:0.5%Bi 3+ ,2%Tb 3+ ,0.75%Eu 3+ with CIE chromaticity coordinates of (0.3728,0.3166), a CCT of 3671 K, and a Ra index of 87 could be realized under UV light excitation. The fabricated w-LED by combining UV chip with CLAB:0.5%Bi 3+ ,2%Tb 3+ ,0.75%Eu 3+ shows excellent thermal stability after high-temperature aging test, implying its promising application in single-phosphor-converted warm w-LEDs.
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INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Yue-hong Zhang,Meng-jiao Zhai,Lei Shi,Qin-yang Lei,Shu-tong Zhang,Lei Zhang,Bin Lyu,Shun-hua Zhao,Jian-zhong Ma,Vijay Kumar Thakur
Vitrimers with reversible cross-links are emerging promising sustainable materials with reprocessability and recyclability. Here, castor oil-based epoxy resin (EMCO) with epoxy group and carbon-carbon double bonds was prepared through a two-step process and then cured with itaconic acid (IA) through epoxy-acid ring-opening reaction and free radical polymerization to fabricate fully bio-based epoxy vitrimers containing reversible transesterification bond. The thermal-mechanical properties, reprocessability, repairability, and recyclability could be balanced by varying the molar ratio of EMCO to IA. When the carboxyl group/epoxy group molar ratio reached 1.0, the EMCO-IA 1.0 vitrimer exhibited the highest tensile strength of 14.39 MPa and T g of 52.95 °C. Moreover, the vitrimer can be effectively remodeled (2 h at 180 °C) to prepare films and self-healing thanks to a rapid and mild stress relaxation process (2.56 min at 110 °C) and low activation energy (60.94 kJ·mol −1 ). More significantly, EMCO-IA vitrimer could be degraded in ethanol solution and recycled to prepare films and also exhibited excellent UV blocking ability. Overall, the EMCO-IA vitrimer can achieve a highly efficient closed-loop recycling without significantly sacrificing the mechanical properties, which can extend the service life and facilitate the sustainable development of the castor oil-based polymeric material.
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Journal of Composites Science
·
2023
·Vol. 7
·期 2
·51
·
IF 3.3
Zhanqi Li,Ling Zhu,Xiaowen Xie,Meng Zhou,Changqing Fu,Shuai Chen
Despite the fact that PEDOT:PSS has been successfully used in the field of flexible electronics, some of its applications in the domain of rigid conductive coating have been limited by the pricey cost and subpar mechanical properties (hardness, adhesion, and moisture absorption) of the commercially available Clevios™ PH 1000, as well as the poor conductivity, film formation, and mechanical properties of the self-made PEDOT:PSS. In the process of investigating the low-cost preparation of PEDOT-based conductive polymer coatings, we discovered that self-made PEDOT:PSS, a waterborne epoxy resin, and a bio-based epoxy curing agent can be blended uniformly to produce good film-forming conductive coatings. Later, the addition of KH560-modified nano-SiO2further improved the coating’s hardness while ensuring a modest increase in conductivity. Meanwhile, the inadequacies of the epoxy resin, which are not UV-resistant, were considerably improved by the synergistic action of PEDOT:PSS and the modified SiO2. The result is a low-cost method designed for creating conductive coatings that are UV-resistant and may be utilized for electromagnetic, electrothermal, and antistatic shielding applications. Such a PEDOT:PSS/epoxy composite system and its design approach will broaden the scope of PEDOT:PSS’s application and will inspire future research in and practical implementations of PEDOT:PSS-based conducting coatings.Keywords:waterborne epoxy resin;PEDOT:PSS;high hardness;conductive coatings;bio-based;UV-resistant
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TALANTA
·
2023
·
IF 6.1
Peijiang Wang,Shanshan Jiang,Jun Zeng,Yuewen Huang,Bin Song,Bin Wang
Luminescent metal-organic frameworks (LMOF) with ligand-modified are a promising strategy to be applied to fabricate chemical sensors. Herein, a novel Co (II) metal-organic framework (Co-MOF), namely Co [(NTB) bpy] (NTB = 4,4′4″-tricarboxylic acid triphenylamine, bpy = 4,4 ′-bipyridyl), was successfully synthesized with excellent water stability and fluorescence properties. Due to the propeller structure of NTB ligands, a special topological structure of Co-MOF was shown: {2 4 .4 16 .6 8 }{2}4. It was proved that Co-MOF has great stability by soaking in different solvents for two weeks. Remarkably, the fluorescence quenching experiment verified that Co-MOF has excellent fluorescence sensor performance. Trinitrophenol, 2,4-dinitrophenol, and 2-amino-4-nitrotoluene (10 −5 M) with LOD of 9.00 × 10 −5 , 5.40 × 10 −5 and 5.07 × 10 −6 M can be detected via the process of fluorescence enhancement and quenching. Throughout the investigation, the mechanics of fluorescence quenching was performed. Due to the excellent UV absorption capacity of Co-MOF, it was a promising application to combine low-dimensional nanomaterials with sustainable biomass materials. A hybrid films of Co-MOF and cellulose acetate (CA) was generated. The hybrid films had highly transparency in the visible wavelength range and excellent UV-shielding ability owing to the CA/Co-MOF hybrid films enhanced the UV absorption capacity of Co-MOF.
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危险品化学品经营许可证（带存储）