JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 24
·28321-28334
·
IF 2.478
Jiang Yinying,Wang Yizheng,Zhou Kuan,Ding Senxu,Yu Jiang
In recent years, heterojunction photocatalytic materials have received more and more attention. Ball milling and microwave–assisted heating were used in this work to prepare the g–C 3 N 4 /TiO 2 heterojunction photocatalytic nanocomposites with different g–C 3 N 4 /TiO 2 mass ratios (0.5:1, 1:1, 2.5:1, 5:1, 10:1, 20:1, 30:1, and 40:1, labeled as TCN–1, TCN–2, TCN–3, TCN–4, TCN–5, TCN–6, TCN–7, and TCN–8, respectively). The crystal structure, morphology, and optical properties of the samples were characterized by various analytical techniques. The photocatalytic activity was evaluated by the degradation efficiency of Rhodamine B (RhB) and methylene blue (MB) under visible light and UV irradiation. After 120 min at visible light illumination, TCN–7 had the best degradation efficiency with 99.41% for RhB and 91.75% for MB, whereas after 120 min at UV light illumination, TCN–7 exhibited the best degradation effect, and the efficiency reached at 48.66% for RhB and 71.64% for MB, respectively. The analysis of crystal structure of the as–prepared TCN samples confirmed that TCN–7 has a good crystallinity, which is facilitated for photocatalytic activity. In photocatalytic reactions, superoxide radical (·O 2 − ), hydroxyl radical (·OH), and hole (h + ) are recognized as the main active groups, and ·O 2 – plays the main role for TCN–7 in the photocatalytic reaction system for the degradation of RhB.
✓ 已验证
产品关联
DOI
高影响因子
INFRARED PHYSICS & TECHNOLOGY
·
2026
·
IF 3.8
Guanghui Jing,Tingting Wu,Jian Wen,Wei Liu,Yulin Wang,Mengying Lu,Hongwei Lei,Su Sheng,Chao Jiang
High-precision detection of ultraviolet and blue light intensity remains a major challenge in monitoring fields such as industrial, medical, and laboratory applications. This paper proposes a strategy to enhance the sensing performance of FPI cavity using a ZnO/PVA composite material. Leveraging the photo-generated carrier effect of ZnO, the refractive index within the cavity is directly modulated, yielding high-sensitivity wavelength modulation for both UV and blue light. Experimental results show that the FPI 1 cavity with ZnO/PVA composite material achieves a UV sensitivity of 0.273 nm/(mW·cm −2 ) and a blue sensitivity of 0.267 nm/(mW·cm −2 ). Furthermore, a dual-cavity structure (S 1 ) based on the Vernier effect, formed by connecting FPI 1 and FPI 2 in parallel, demonstrates significantly enhanced sensitivities of −2.140 nm/(mW·cm −2 ) for UV light and −2.392 nm/(mW·cm −2 ) for blue light. In addition, the proposed sensing element features facile fabrication, excellent stability, and a relatively simple fiber-optic configuration. This work provides a high-performance fiber-optic approach for UV and blue-light intensity detection, with a low-cost and convenient sensing-element fabrication process.
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Technologies
·
2023
·
IF 6.8
Huan Zhang,Jufeng Huang,Yu Wang,Yaxian Qin,Jiaxiang Lu,Liang Su,Xilin Li,Jinbo Wang,Haolun Wang,Jianan Song,Sen Lin
As the prevalence of electromagnetic interference (EMI) continues to rise, there is a growing demand for shielding materials, which play a crucial role in electronic devices, communication systems, health protection, etc. However, conventional EMI shielding materials encounter difficulties in effectively addressing the escalating intricacies of electromagnetic environments and diverse shielding scenarios, wherein foldability, flexibility, and lightweight are desired. In this work, a novel EMI shielding material, silver-hollow-fiber (AgHF), is developed by combining blow-spinning, UV radiation, and temperature-controlled annealing technologies. During the fabrication process, UV radiation is used to selectively reduce silver ions on the outer surface of precursor fiber, and temperature-controlled annealing is further employed to remove the inside polymer, forming a hollow fiber structure. The AgHF exhibits superior flexibility, lightweight, remarkable mechanical stability, and excellent EMI shielding efficiency (SE). Particular, the AgHF with a thickness of 163 µm demonstrates an EMI SE of 101.65 dB, and with minimal degradation of less than 10% even after undergoing 2000 bending cycles. The remarkable EMI shielding performance, combined with the lightweight, flexibility, and mechanical stability of AgHF, positions it as a highly promising material for a wide range of EMI shielding applications in the future.
✓ 已验证
产品关联
DOI
高影响因子
WATER RESEARCH
·
2023
·
IF 12.8
Xuecong Qian,Shilong Wang,Haijun Cheng,Ziye Jia,Da Wang,Yandong Xie,Jinhao Duan,Yu Tian,Jun Ma
The oxidation kinetics of Mn(II) by free chlorine is relatively low under near-neutral pH conditions which limits the Mn removal efficiency in drinking water treatment. Therefore, this study investigated the oxidation efficiency of Mn(II) by the UV-enhanced chlorination (UV/chlorine) system and identified the responsible reactive radical species. The results show that the oxidation kinetic of Mn(II) was greatly enhanced by the UV/chlorine system under near-neutral pH or even acidic conditions. The pseudo-first-order reaction rate of Mn(II) at pH 8.0 (within the first 20 min) increased from 2.60 × 10 −5 s −1 to 3.41 × 10 −4 s −1 . Based on the scavenging experiments and the steady-state kinetic modeling, ClO · and ClO 2 , whose steady-state concentration (∼10 −10 M and ∼10 −9 M, respectively at pH 8.0) was at least 4 orders of magnitude higher than that of HO · and Cl · , were recognized as the dominant reactive species contributing to the oxidation of Mn(II). Kinetic model calculations indicate that the contribution of ClO · to the oxidation of Mn(II) was consistently maintained above 70 %, and ClO 2 also played an important role in the oxidation of Mn(II) especially under acidic and alkaline conditions. In addition, the background components of HCO 3 − and Cl − had negligible influence on the oxidation efficiency because they barely changed the concentration of the ClO · and ClO 2 . This study first demonstrates the important role of ClO 2 in the oxidation of Mn(II) in the UV/chlorine system, and the possible role of ClO 2 in the degradation of some organic pollutants needs to be carefully evaluated in the future.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Lan Ding,Ling Sun,Ziwei Wang,Di Li,Qiuyan Zhang,Xiaohui Liu,Yuanlin Ren,Yuesheng Li
Multifunctional cellulose fabrics with flame retardancy, electrical conductivity and UV resistance are expected to be used in the next generation of wearable flexible sensors, so there is an urgent need to develop novel coating systems that improve the natural properties of cellulose fabrics and give it more functionality. Here, a 2D-3D hetero-structured multifunctional coating consisting of titanium carbide (Ti 3 C 2 Tx MXene), zeolitic imidazolate framework-8 (ZIF-8) and phosphonitrilic chloride trimer (PPZ) was constructed on cotton/lyocell blended fabrics (C/L) by a one-pot impregnation method. Briefly, C/L first interacted with MXene via hydrogen bonding, and then the ZIF-8 encapsulation system grew in situ on MXene. The optimal sample obtained, named as MXene@ZIF-8@PPZ-C/L, combines flame retardancy, human motion detection and UV resistance. Compared to the untreated C/L, MXene@ZIF-8@PPZ-C/L exhibited a limiting oxygen index value of up to 30.8%, with peak heat release rate and total heat release values reduced by 65.7% and 15.8%, respectively. Meanwhile, MXene@ZIF-8@PPZ-C/L with an electrical conductivity of 24.4 s/m was able to sense human movement stably and continuously. Moreover, MXene@ZIF-8@PPZ-C/L also showed a high ultraviolet protection factor. In short, this work provided a simple method for fabricating new-generation multifunctional flexible wearable smart fabrics.
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Hua-Bin Yuan,Xue Lei,Jin Cheng,Tieling Xing,Guoqiang Chen
Polyphenols have been utilized to connect hydrophobic modifiers with certain substrates because of their adhesive properties and multiple active groups in their structure. Nevertheless, research is scarce regarding using polyphenols to enhance the superhydrophobic properties of polyamide . In this study, a plant-derived phenolic compound , p-coumaric acid (pCA), was chelated with Fe 3+ and deposited on the polyamide 66 (PA66) surface to increase its roughness. Subsequently, octadecanethiol was grafted onto pCA using a thiol-ene click chemistry reaction to create a superhydrophobic modified PA66 fabric (pCA-Fe-SH-PA66) with a static water contact angle (CA) of 154.4° and a sliding angle (SA) of 2°. The resulting pCA-Fe-SH-PA66 demonstrated excellent capabilities in self-cleaning, UV-blocking, photothermal conversion, and oil-water separation. Furthermore, pCA-Fe-SH-PA66 exhibited remarkable antibacterial ability, displaying inhibitory rates of 97.00% against E. coli and 96.15% against S. aureus , respectively. Additionally, it demonstrated noteworthy stability in a series of tests, encompassing 225 min of washing, 1000 cycles of abrasion, 48 h of UV light aging, 48 h of acid/base solution, seawater, and organic reagents immersion. Furthermore, it was demonstrated that three additional plant-derived phenolic compounds, namely 3-hydroxycinnamic acid (HA), polyatin (PD), and 4-hydroxy-3,5-dimethoxycinnamic acid (HDA), can also be effectively utilized for the multifunctional modification of PA66 fabric. The proposed modification method is mild, fast, and simple, offering a novel approach to the multifunctional modification of synthetic materials. The modified PA66 fabric holds potential in applications such as oily wastewater treatment , outdoor sportswear, tents, and other fields.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
·
2021
·
IF 5.551
Wantang Wang,Baoguo Zhang,Yunhui Shi,Tengda Ma,Jiakai Zhou,Ru Wang,Hanxiao Wang,Nengyuan Zeng
Chemical mechanical polishing (CMP) has revolutionized the processing of semiconductor material such as silicon carbide (SiC). However, the strong chemical bond between silicon atoms and carbon atoms gives SiC materials a very high mechanical hardness and chemical stability. Therefore, SiC wafers may suffer from a low material removal rate (MRR) and serious subsurface damage when traditional CMP methods are used. In this study, to improve the CMP properties of Si-face of the 4H-SiC wafers, the synergistic effect of UV and TiO 2 on the activation of persulfate (PS) was investigated for the first time. The response surface method was employed to study the effect of pH, PS concentration, and TiO 2 dosage on CMP in-depth, and to ultimately optimize the polishing process. The analysis demonstrated that an MRR of 608 nm/h can be obtained with the average surface roughness ( Sq ) of 0.521 nm when the pH is 6, in which the TiO 2 dosage is 0.015 wt% and the PS concentration is 3 wt%. Polarization curves , AC impedance spectra and X-ray photoelectron spectroscopy tests were performed to further analyze the chemical action of the slurry, which showed that the introduction of UV-TiO 2 strongly enhances the chemical action of slurry and results in the formation of a passivated layer on the SiC surface. Finally, based on the radical quenching experiments and the results mentioned above, a model that relates to the removal of 4H-SiC by UV-TiO 2 synergistic activation of PS is proposed.
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Haiying Chen,Jiemin Liu,Chuandong Wu,Tongwang Zhang
Volatile organic compounds (VOCs) emissions are regarded as a worth concerned threat to human health. The UV-Fenton coupled with mass transfer enhanced process shows promising effects on VOCs treatment. However, the detailed mechanism and mathematical model for this method have not been established. This work focuses on the hypothesis and validation of a mathematical model for UV-Fenton removal of VOCs using activated carbon particles to enhance mass transfer efficiency. Based on the mathematical model of reaction-diffusion-mass transfer, a mathematical model is established by using a series of important parameters such as u b , D g , D l , K ial , K l a and hydroxyl radical lifetime. The proposed model in this study introduces the key parameter of synergistic factor, which greatly improves the consistency between the model predicted results and the experimental data (the determination coefficient R 2 distribution range changed from 0.71–0.98 to 0.95–0.98). Moreover, it can also explain reasonably the steady trend of outlet VOC concentration after 30 min of reaction. The mathematical model confirms that the addition of activated carbon during the UV-Fenton reaction ensures mass transfer efficiency and considerably improves (growth from 2% to 54%) the VOCs removal efficiency due to the synergy between UV-Fenton oxidation and mass transfer enhancement. Meanwhile, it provides insight into fruitful utilization of the oxidation capacity in the oxidation reaction,and achieves the purpose of predicting the efficiency of VOC removal in the Fenton process.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Zheng-Yu Dong,Bin Xu,Chen-Yan Hu,Tian-Yang Zhang,Yu-Lin Tang,Yang Pan,Mohamed Gamal El-Din,Qi-Ming Xian,Nai-Yun Gao
A novel light source UV-C laser was applied in persulfate (PS) activation to effectively remove iodinated X-ray contrast medias (ICMs) including iohexol (IOX), iopamidol (IPM) and diatrizoate (DTZ) in this study. Significant ICMs degradation was observed in UV-C laser/PS systems with pseudo first-order rate constants of 0.022–0.067 s −1 . Sulfate radicals (SO 4 •− ) were the main active species in the three ICMs degradation, and the steady-state concentrations ([SO 4 •− ] ss ) were 3.629 × 10 −11 M (IOX), 1.702 × 10 −11 M (IPM) and 1.148 × 10 −11 M (DTZ), respectively. Under the high intensity of UV-C laser, the optimal reaction efficiency was achieved at pH = 7.0 with PS concentration of 1.0 mM, and the degradation efficiency for IOX reached 93.8% within only 40 s. Both bicarbonate and chloride ions could inhibit the three ICMs degradation and the inhibition rate increased with the increase of ions concentration . The kinetic models were established and the steady-state concentrations of radicals were calculated. Density functional theory (DFT) calculations combined with experiments were used to derive the reaction pathways for three ICMs. Cyclic voltammetry measurements detected a lower redox potential peak in IOX degradation, revealing the existence of electron shuttles under the UV-C laser irradiation to promote the redox reaction. This study is the first report of UV-C laser activation of persulfate. It is a new advanced oxidation process mediated by very effective photolysis and active species formation.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2021
·
IF 5.03
Chunyang Li,Chengcheng Zhang,Hong Zhao,Hui Zhang,Xuan Wang,Baozhong Han
Voltage stabilizers are widely used to improve the resistance to electrical treeing degradation and breakdown of cross-linked polyethylene (XLPE) insulating materials. However, the effects of voltage stabilizers under high temperatures are not fully investigated by now, and the long-term effect of voltage stabilizers is still a concern due to its poor compatibility with polymer. In this work, the UV absorber 4-allyloxy-2-hydroxybenzophenone (AOHBP) which contains an unsaturated graftable vinyl group was demonstrated as a high-efficiency voltage stabilizer and compared with an ungraftable UV absorber as reference. Characterization by Fourier transform infrared (FTIR) spectra and differential scanning calorimetry (DSC) indicated that the AOHBP could be grafted onto the macromolecules of XLPE through radical addition reaction on the vinyl during peroxide cross-linking process. The test results of electrical tree initiation, electrical tree propagation and breakdown strength indicated that the grafted voltage stabilizer AOHBP exhibited higher efficiency than the ungrafted UV absorber and could comprehensively improve the electrical tree initiation voltage, inhibit the electrical tree propagation and improve the breakdown strength of XLPE at different temperatures. Through the electrical aging test with the longest aging time of up to 6000h, the AOHBP was confirmed to still maintain the initial effect on improving the breakdown strength after aging, which indicated that the migration and precipitation of AOHBP was restrained by the grafting reaction. The mechanism of AOHBP improving the electrical properties by scavenging high-energy electrons was analyzed by theoretical calculation based on density functional theory (DFT). It was proposed that the graftable AOHBP is a promising voltage stabilizer.
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Chang-An Xu,Zhencai Qu,Mangeng Lu,Huifa Meng,Yingjie Zhan,Bing Chen,Kun Wu,Jun Shi
Although polyurethane pressure-sensitive adhesives (PSAs) have been widely used, there are still some deficiencies in adhesion and heat resistance . To make up for these shortcomings, rosin is introduced into polyurethane/polysiloxane copolymer to improve its heat resistance and adhesion, while its hydrophobicity is also improved. The vinyl-terminated polyurethane/polysiloxane copolymer is synthesized by a one-pot polymerization method, and finally PSA with different content of rosin is obtained by UV radiation . The effects of rosin on heat resistance, hydrophobicity, viscoelasticity , adhesion and antibacterial of PSA have been studied. The results show that the heat resistance index, the contact angle and the peel strength of PSA are increased by 4%, 31 % and 88 % respectively when rosin content is 6 wt%. In addition, the storage modulus and loss modulus of PSAs enhance with the increase of frequency, and the storage modulus of PSAs is always higher than the loss modulus. All PSAs have good antibacterial properties, with an antibacterial rate above 99.2 %. This will help expand the application of polyurethane/polysiloxane PSA such as food packaging materials.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY
·
2020
·
IF 1.365
Panpan Hao,Bingyan Sun,Xiaomeng Chu,Yujuan Sun,Xuteng Xing,Shaojie Liu,Erjun Tang,Xiaodong Xu
In this work, the isocyanate terminated castor oil based urethane oligomer (CO-IPDI) was prepared by the reaction of castor oil and isophorone diisocyanate (IPDI) without adding any organic solvent. After the acrylic copolymer pressure sensitive adhesive (PSA) was heated at 80 °C for 20 min, it was mixed with CO-IPDI, trifunctional acrylic monomer and photo-initiator in a certain proportion to give a UV-curable peelable adhesive for silicon wafer cutting process. Before UV irradiation, the acrylate copolymer chains were cross-linked by CO-IPDI to form a network. After UV irradiation, another polymer network formed by photo-polymerization of trifunctional acrylic monomer hold together with it to form an interpenetrating network (IPN) structure. The results showed that this IPN structured UV-curable peelable PSA had a high peeling strength of 13.99 N/25 mm before UV curing to meet the suggested requirements for silicon wafer cutting process. The peeling strength was significantly decreased to 0.49 N/25 mm after UV curing, and the tape was easily peeled off from wafer with about 0.96% residual adhesive estimated by the area ratio of all residual adhesive particles to silicon wafer observed by scanning electron microscopy. This work provides a new candidate idea for green and efficient preparation of UV-curable peelable PSA.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）