Advanced Fiber Materials
·
2023
·Vol. 5
·期 2
·681-693
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IF 16.1
Wang Yan,Guo Ziyi,Xiong Jie,Liu Jingchong,Zhao Yong,Guo Fengyun
Flexible wearable ultraviolet (UV) shielding, monitoring and warning devices have important applications in civil and military fields. However, most flexible wearable UV devices show unsatisfactory performance due to their poor stability and easy failure at large strains. Herein, inspired by tree rings, we engineered a hierarchical composite nanofibrous helix with an alternately stacked Archimedes spiral structure via a cost-effective strategy. Based on a photo-electricity-acoustic energy conversion system, we fabricated an all-in-one device exhibiting strain-insensitive UV protection at 0–500% strain for UV shielding as well as strain-sensitive UV monitoring at 500–1500% strain for UV early warning. Compared with previously reported common nanofibrous membrane devices, the as-prepared composite nanofibrous helix shows great advantages in terms of stability and UV protection, especially at large strains. Furthermore, the helix demonstrates multiple functions of wear resistance, antibacterial properties, biodegradation and knittability. This versatile strategy holds great promise for wearable electronics and multifunctional devices. Graphical abstract
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MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 2
·1-12
·
IF 5.7
Zhang Zi-Yang,Xu Yi-Heng,Chen Ke-Yan,Zhang Mei-Hang,Meng Chun-Yan,Wang Xue-Sheng,Wang Man-Man
Benzotriazole UV stabilizers (BUVSs) are a class of emerging contaminants of concern; the development of rapid and convenient monitoring method for these trace-level pollutants in waters is of crucial significance in environmental science. Here, a novel magnetic flower-like molybdenum disulfide/cobalt ferrite nanocomposite (MoS 2 /CoFe 2 O 4 ) was synthesized by hydrothermal reaction. Compared with the conventional Fe 3 O 4 -based magnetic composites, the proposed material just required a minimum consumption of Co/Fe towards the equivalent of MoS 2 while providing superior magnetization performance. Taking advantages of high adsorption capacity, extraordinary stability, and repeatability in construction, MoS 2 /CoFe 2 O 4 was applied to the extraction to BUVSs. The enrichment factors of three BUVSs were in the range 164–193 when 20 mL of environmental water sample was loaded on 40 mg of the adsorbent. MoS 2 /CoFe 2 O 4 could be regenerated and recycled at least 10 cycles of adsorption/desorption with recoveries of 80.1–111%. The method of MoS 2 /CoFe 2 O 4 -based extraction coupled with high-performance liquid chromatography-variable wavelength detector was applied to the monitoring of BUVSs in seawater, lake water, and wastewater, which gave detection limits ( S/N = 3) of 0.023–0.030 ng·mL −1 and recoveries of 80.1–110%. The intra-day and inter-day precisions (relative standard deviation, RSDs, n = 3) were in the range 1.6–7.5% and 3.2–11.5%, respectively. The approach is an alternative for efficient and sensitive extraction and determination of trace-level environmental pollutants in waters. Graphical Abstract
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高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Lin Duan,Yiyuan Qin,Xin Meng,Yaqi Liu,Tong Zhang,Wei Chen
Microplastics in the environments can undergo various aging processes that alter their physicochemical properties and consequently their affinities for environmental contaminants. Here, we compare the effects of sulfide-induced aging (a common process in anoxic environments) and UV-induced aging on contaminant binding of polypropylene (PP), polystyrene (PS) and polyethylene terephthalate (PET) microplastics derived from commercial plastic products. The two aging processes differentially affect adsorption of pyrene (a model nonionic, nonpolar organic) and ciprofloxacin (CIP, a zwitterion under the conditions tested) by modulating the hydrophobicity , surface charges and polarity of the microplastics to different extents. The effects of the two treatments on Cd(II) adsorption correlate well with their modulation on ζ potential and surface (O + S)/C ratio of the microplastics. For all three microplastics sulfide treatment results in stronger adsorption of Cr(VI) and its subsequent conversion to Cr(III) than does UV treatment , as the thiol groups formed during sulfide treatment strongly regulate the complexation and reduction of Cr(VI). Notably, both sulfide and UV treatments result in the flattening of the PET microplastics, significantly enhancing the adsorption of all four contaminants, by increasing surface area for adsorption. The findings of this study further underline the importance of understanding environmental aging/weathering processes of microplastics, particularly, those readily occur in anoxic environments but were previously not well studied.
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高影响因子
Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 14
·4230-4240
·
IF 7
Ziwang Zhang,Nan Yang,Zhuo Li,Jun Chen,Pin Chen,Yiqin Xu,Jianxin Shi,Mingmei Wu
Single-phase white light phosphors for phosphor-converted white light-emitting diodes (pc-WLEDs) have become a hot spot and attracted considerable attention. However, the unsatisfactory luminous efficiency and colour rendering index of this kind of device hinder their large-scale applications in the field of lighting. Herein, a novel multi-centre activated single-phase white light phosphor, Gd2Sr3B4O12:Ce3+,Tb3+,Sm3+, has been designed and prepared. The crystal structures of the host and the doped samples are characterized with XRD and Rietveld refinements. The band gap of the host calculated with the density functional theory is consistent with the value obtained from the UV-Vis reflection spectrum. Benefiting from the energy transfer paths of Ce3+–Tb3+, Ce3+–Sm3+ and Tb3+–Sm3+, which are quantitatively evaluated with photoluminescence spectra and decay curves, the intensities of the characteristic emission peaks of the three dopants are found to be closely interlocked and the emission colour of the phosphors can be precisely tuned by adjusting the relative ratio of the three ions. Under the excitation of near-UV light, the two phosphors of Gd2Sr3B4O12:0.03Ce3+,0.18Tb3+,0.05Sm3+ and Gd2Sr3B4O12:0.03Ce3+,0.22Tb3+,0.07Sm3+ emit white light with CIE coordinates of (0.32, 0.35) and (0.34, 0.34), and the quantum efficiencies are 46.8% and 34.9%, respectively. The temperature-dependent photoluminescence spectra of the phosphors show that the quenching temperature (T50%) is as high as 450 K. Finally, WLED devices with maximal colour rendering index of 87.5 are obtained by fabricating the two single-phase white light phosphors with 365 nm LED chips. The balanced and preferable comprehensive performances of Gd2Sr3B4O12:Ce3+,Tb3+,Sm3+ demonstrate that the as-prepared single-phase white light phosphor can be a promising candidate for fabricating near-UV chip-based WLEDs.
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POLYMER
·
2023
·
IF 4.6
Wei Zhang,Ruolin Wang,Zhen Yang,Yongping Bai,Linghui Meng,Yu Wang
UV-curable silicone pressure-sensitive adhesive (SPSA) is composed of silicone rubber and silicone resin. Generally, the C C double bond in acryloyloxy group provides a photocurable group for SPSA. However, oxygen inhibition of acryloyloxy group block the degree of cure and C C double bond conversion of SPSA during the photopolymerization . Therefore, efficient photocurable groups for UV curing SPSA is particularly important to be developed. Thiol-ene click polymerizations have been widely used in photocrosslinked polymers due to the rapid efficiency of reactions. In this study, sulfhydryl functionalized silicone resin (SFSR) and methacrylate functionalized amino silicone rubber (MFASR) were synthesized to prepare a SPSA via photoinitiated thiol-ene click polymerization. The double bond in MSASR and sulfhydryl in SFSR were characterized by FT-IR spectroscopy and 1 H NMR spectroscopy . The double bond conversion of SPSA was calculated after polymerization. The cohesion of SPSA was improved by SFSR, while the crosslinking degree was improved by thiol-ene. The loop tack of SPSA with 50 wt% SFSR was 9.01 N, and the 180° peel strength was 11.37 N/25 mm. The SPSA maintained good bonding adhesion to steel at various temperature.
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ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Pengfei Tang,Zhiqiang Wang,Chao Wen,Chuantao Yin,Yuxian Xing,Haoming Tai,Feng Jiang
With the increasing concern about global environmental issues, reducing the carbon footprint to achieve carbon neutrality has been particularly important. Sustainable multiblock copolymer elastomers (MBCPEs) have received tremendous interest due to their unprecedented performance and huge potential applications. However, complex multistep polymerization and postpolymerization processes are needed to design MBCPEs. In this work, a series of MBCPEs, in which vanillin acrylate (VA) derived from lignin was selected as the renewable rigid segments for the glassy block, while methyl acrylate (MA) was chosen as the soft segments for the rubbery block, were prepared by two successive reversible addition–fragmentation chain transfer (RAFT) polymerization processes with polytrithiocarbonate (PTTC). These thermally stable MBCPEs exhibit distinct microphase-separated morphology, where the hard poly(vanillin acrylate) (PVA) blocks self-assemble into discrete glassy domains serving as the physical cross-linking points in the soft poly(methyl acrylate) (PMA) matrix. The macroscopic mechanical performance, such as tensile strength, stretchability, toughness, and elastic recovery, can be adjusted well by changing the molecular weights and PVA contents. Moreover, these sustainable MBCPEs can be applied as strong adhesives and excellent UV-shielding materials, broadening their potential applications. This novel strategy is convenient and robust by combining RAFT polymerization and renewable resources toward high-performance MBCPEs, which can open a new avenue for the development of sustainable biobased elastomers.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yongdong Shi,Yu Tian,Youjun Guan,Xinchang Kang,Yuanxing Li,Kunyu Ren,Chaoyao Wen,Chengyun Ning,Lei Zhou,Rumin Fu,Guoxin Tan
All-polymer piezoelectric elastomers that integrate self-powered, soft, and elastic performance are attractive in the fields of flexible wearable electronics and human–machine interfaces. However, a lack of adhesion and UV-blocking performances greatly hinders the potential applications of elastomers in these emerging fields. Here, a high-performance piezoelectric elastomer with piezoelectricity, mechanical robustness, self-adhesion, and UV-resistance was developed by using poly(vinylidene fluoride) (PVDF), acrylonitrile (AN), acrylamide (AAm), and oxidized tannic acid (OTA) (named PPO). In this design, the dipole–dipole interactions between the PVDF and PAN chains promoted the content of β-PVDF, endowing high piezoelectric coefficient (d33, 58 pC/N). Besides, high stretchability (∼500%), supercompressibility (∼98%), low Young’s modulus (∼0.02 MPa), and remarkable elasticity (∼13.8% hysteresis ratio) were achieved simultaneously for the elastomers. Inspired by the mussel adhesion chemistry, the OTA containing abundant catechol and quinone groups provided high adhesion (93.26 kPa to wood) and an exceptional UV-blocking property (∼99.9%). In addition, the elastomers can produce a reliable electric signal output (Vocmax = 237 mV) and show a fast response (24 ms) when subjected to external force. Furthermore, the elastomer can be easily assembled as a wearable sensor for human physiological (body pulse and speech identification) monitoring and communication.
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高影响因子
POLYMER
·
2023
·
IF 4.6
Xiangzhao Wang,Xiaobin Huang,Zemin Ji,Wenbin Hu,Haoqiang Sheng,Xiaofei Li
Icephobic coatings have attracted wide attention due to low energy consumption, low cost, and high efficiency. However, the icephobic coating is vulnerable to external damage due to long-term exposure, which can result in icephobic properties loss and limit its industrial application. Herein, the novel amphiphilic epoxy self-healing icephobic coating was designed by a compound with multiple hydrophilic groups, polydimethylsiloxane (PDMS) with hydrophobic groups and 4, 4′-diaminodiphenyldisulfide (APD) with reversible bonds. Moreover, considering the resource crisis, the biobased epoxy (GTE) was selected as the compound containing hydrophilic groups. In this study, the GTE will form hydrogen bonds with water molecules to achieve an anti-icing effect, while PDMS mainly play a deicing effect due to low surface energy. Due to the reasonable design, the icephobic coating showed good comprehensive icephobic properties: a 12.5-fold increase in icing delay time (802 s) and a 6.6-fold decrease in ice adhesion strength (32.6 kPa) compared with bare aluminum . Furthermore, the crystallization temperature of water was reduced by about 11 °C. More importantly, the APD with reversible disulfide bonds provides the icephobic coating with self-healing performance, removability, and excellent UV shielding performance. The coating provides a new idea for the preparation of sustainable and durable coatings with comprehensive icephobic performance.
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REACTIVE & FUNCTIONAL POLYMERS
·
2022
·
IF 4.966
Fuping Bian,Xiaoquan Li,Jihe Zhao,Xuefeng Gui,Jiwen Hu,Shi Li,Shudong Lin
Ultraviolet (UV) photocuring technology has gained importance in crosslinking of polymers, as it allows fast curing rate, low energy consumption and no volatile organic compounds (VOCs). However, the photopolymerization of very thick films and in shadow areas where the light penetration is inhibited (e. g. in filled, pigmented, dispersed samples) remains a huge challenge. As reported herein, a simple hydrosilylation reaction was employed to synthesize epoxy-based silicone prepolymers . Firstly, the structures of the synthesized epoxy-based silicone prepolymers were characterized by Fourier-transform infrared (FT-IR) and proton nuclear magnetic resonance ( 1 H NMR) spectroscopy techniques, thus confirming the successful synthesis of these prepolymers. The epoxy group of prepolymers could be crosslinked under UV irradiation , and its silicone methoxy group (-SiOCH 3 ) was condensed under moisture ambient, so as to acquire both thick coatings and pigmented coatings due to the dual-curing approach. Moreover, water droplets exhibit water contact angles between 103° and 108° on these coatings, and surface energies of the these coatings are from 25.27 to 22.67 mN/m. The transparency of these coatings is over 90%. They remain stable at temperatures reaching up to 332.2 to 344.8 °C, thus demonstrating that they have excellent heat resistance. The coatings exhibited good mechanical properties with a tensile strength >4.57 MPa. Finally, the coatings have good anti-smudge and anti-fingerprint properties, and the overall results show that these films have potential applications as anti-smudge coatings.
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Nanomaterials
·
2022
·Vol. 12
·期 22
·4062
·
IF 5.719
Bo Zhang,Shuai Zhang,Yi Xia,Pingping Yu,Yin Xu,Yue Dong,Qufu Wei,Jing Wang
Optical excitation is widely acknowledged as one of the most effective means of balancing sensor responses and response/recovery properties at room temperature (RT, 25 °C). Moreover, noble metals have been proven to be suitable as photosensitizers for optical excitation. Localized surface plasmon resonance (LSPR) determines the liberalization of quasi-free electrons in noble metals under light irradiation, and numerous injected electrons in semiconductors will greatly promote the generation of chemisorbed oxygen, thus elevating the sensor response. In this study, pure SnO2and Au/SnO2nanowires (NWs) were successfully synthesized through the electrospinning method and validated using XRD, EDS, HRTEM, and XPS. Although a Schottky barrier led to a much higher initial resistance of the Au/SnO2composite compared with pure SnO2at RT in the dark, the photoinduced resistance of the Au/SnO2composite became lower than that of pure SnO2under UV irradiation with the same intensity, which confirmed the effect of LSPR. Furthermore, when used as sensing materials, a detailed comparison between the sensing properties of pure SnO2and Au/SnO2composite toward NO2in the dark and under UV irradiation highlighted the crucial role of the LSPR effects. In particular, the response of Au/SnO2NWs toward 5 ppm NO2could reach 65 at RT under UV irradiation, and the response/recovery time was only 82/42 s, which far exceeded those under Au modification-only or optical excitation-only. Finally, the gas-sensing mechanism corresponding to the change in sensor performance in each case was systematically proposed.Keywords:Au-loaded;UV irradiation;synergistic effect;NO2;gas sensor
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Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 36
·18834-18844
·
IF 14.511
Mingchuan Yang,Shan Li,Shugang Zhang,Bin Gao,Zhaohui Tong,Dongdong Cheng,Denglun Chen,Ruya Huang,Yuechao Yang
Large tablet controlled-release fertilizers (LCRFs) can significantly improve nutrient utilization and reduce coating costs. However, traditional petrochemical coating materials are expensive and non-renewable. Furthermore, conventional heat-curing coating process is both time and energy consuming and severely impairs the controlled-release characteristics of LCRFs. To solve above problems, green processes using renewable biomaterials have become the research hotspot for the new generation of LCRFs. In this work, bio-based polyurethane acrylate (BPUA), synthesized from castor oil, was used to coat large tablet by an innovative UV-curing process for controlled-release fertilizer to overcome the drawbacks of the heat-curing process. Furthermore, BPUA was modified with polydimethylsiloxane (PDMS) and thiol grafted nanosilica (TNS) to prepare dense and superhydrophobic biopolymer-coated large tablet controlled-release fertilizer (DSBCF). The DSBCF exhibited remarkable controlled-release characteristics with a nitrogen release longevity of nearly 120 days, requiring only 4% of the coating materials. This research provides an efficient UV-curing strategy to manufacture energy saving, superior performance and biopolymer-coated LCRFs. It can solve bottlenecks that limit the development of coated fertilizers and provide theoretical and technical support for the green upgrade of the industry.
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FOOD CONTROL
·
2022
·
IF 6.652
Tao Zhang,Wenshuo Zhang,Yajun Deng,Yifu Chu,Yuye Zhong,Guannan Wang,Yabo Xiong,Xinghai Liu,Lingyun Chen,Houbin Li
Introducing natural products to obtain ultraviolet (UV) shielding materials for inhibiting the photo-oxidation of oily foods is environmentally friendly food technology. Instead of traditional physical mixing, curcumin was introduced into castor oil-based waterborne polyurethane as a chain extender and compounded with gelatin for bioactive composite films. With the increase of curcumin-based waterborne polyurethane (CWP), the film with 10 wt% CWP achieved nearly complete ultraviolet shielding. The swelling index and water solubility were reduced by 800% and 12.93%, respectively. The tensile strength and elongation at break increased by 183% and 114%, respectively. In addition, CWP enhanced the antioxidant activity of curcumin in water system by 52.10% and reduced the oxidation degree of soybean oil by 62.03–87.84%. This work provides a new idea for compounding natural active small molecules with polymers.
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危险品化学品经营许可证（带存储）