INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
·
IF 8.2
Yinan Li,Jun Wang,Jiajia Guo,Chenglong Fu,Liulian Huang,Lihui Chen,Yonghao Ni,Qinghong Zheng
Actuators are widely used in bionic devices and soft robots, among which invisible actuators have some unique applications, including performing secret missions. In this paper, highly visible transparent cellulose-based UV-absorbing films were prepared by dissolving cellulose raw materials using N -methylmorpholine-N-oxide (NMMO) and using ZnO nanoparticles as UV absorbers. Furthermore, transparent actuator was fabricated by growing highly transparent and hydrophobic polytetrafluoroethylene (PTFE) film on regenerated cellulose (RC)-ZnO composite film. In addition to its sensitive response to Infrared (IR) light, the as-prepared actuator also shows a highly sensitive response to UV light, which is attributed to the strong absorption of UV light by ZnO NPs. Thanks to the drastic differences in adsorption capacity between the RC-ZnO and PTFE materials for water molecules, the asymmetrically- assembled actuator demonstrates extremely high sensitivity and excellent actuation performance, with a force density of 60.5, a maximum bending curvature of 3.0 cm −1 , and a response time of below 8 s. Bionic bug, smart door and the arm of excavator made from the actuator all exhibit sensitive responses to UV and IR lights.
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E-POLYMERS
·
2023
·Vol. 23
·期 1
·
IF 3.7
Xuya Fu,Tao Zhang,Wenshuo Zhang,Yuye Zhong,Shuliang Fang,Guannan Wang,Ying Li,Yajun Deng,Xinghai Liu,Houbin Li
Biomass films with ultraviolet (UV)-shielding ability have attracted considerable attention. Curcumin was introduced into castor oil-based polyurethane (CCPU) as a chain extender, which was melt with polylactic acid (PLA) as a reinforcement to obtain biomass UV-shielding film. The excellent UV absorption and antioxidant qualities of curcumin contributed to the impressive UV-shielding capacity (97.6% UV radiation absorption) and antioxidant (51% free radical scavenging) of PLA/CCPU-20 film. In the scanning electron microscopic images of film fracture, the mixing of CCPU elastomer into the PLA matrix caused the blend films to exhibit significant toughening fracture characteristics compared to the pure PLA film. The excellent thermal stability, low water swelling degree, and low water solubility of PLA/CCPU blend films were maintained after CCPU was added to the PLA matrix. Therefore, the PLA/CCPU blend films can be considered as a potential packaging material because of its favorable UV-shielding properties and film stability.
Graphical abstract
Schematic for the preparation of the PLA/CCPU blend films.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2023
·Vol. 140
·期 17
·e53788
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IF 3
Lei Jiang,Chengkun Wu,Lu Yao,Qiuxia Dong,Guohua Wu
Regenerated silk fibroin (RSF) fibers have great application prospects in medicine, textiles, optoelectronics, and other fields. However, under the synergistic action of ultraviolet, oxygen, and water, RSF will inevitably become brittle, which will greatly shorten the service life of RSF. Therefore, it is urgent to find some methods to protect RSF from aging damage. Cerium dioxide nanoparticles have a strong ultraviolet absorption and antioxidant capacity and have been used as an anti-aging component for other biomaterials. Thus, the RSF/CeO 2 NPs hybrid fibers were successfully prepared, and a series of artificial aging tests were carried out. Mechanical property is an important index to measure the aging degree. After aging, compared with RSF, the stress of RSF/CeO 2 NPs hybrid fibers was increased by 130.47 ± 4.78 MPa, and the strain of RSF/CeO 2 NPs hybrid fibers was increased by 69.89% ± 1.37%. The results of Fourier transform infrared spectroscopy, UV–Vis, sodium dodecyl sulfate polyacrylamide gel electrophoresis discussed the protective mechanism of CeO 2 NPs, which prevent the transition from β-sheet to α-helix/random coil and the disorder of structure. Furthermore, RSF/CeO 2 NPs hybrid fibers have an excellent antibacterial activity against Escherichia coli and Staphylococcus aureus bacteria; the antioxidant activity of RSF/CeO 2 NPs hybrid fibers is gradually enhanced in the presence of UV-light.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
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IF 3.131
Chunli Li,Zhiguang Li,Xuehong Ren
In this paper, organic ultraviolet absorber 2-hydroxy-4-(3-methacrylate-2-hydroxypropoxy) benzotriazole (BTMA) was synthesized, and characterized by 1 H NMR, Fourier transform infrared spectroscopy (FTIR) and ultraviolet spectroscopy . TiO 2 nanosol was prepared using tetraethyl orthosilicate (TEOS) by a sol-gel method. The synthesized BTMA and TiO 2 nanosol were mixed to form an organic/inorganic hybrid and coated onto polyester (PET) fabrics. The coated PET fabrics were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy dispersive spectrometer (EDS) analysis. Thermal stability, UV protective property, washing stability, and tensile strength of the coated PET fabrics were measured. The coated PET fabrics showed excellent UV protection properties and stability toward washing. It was found that the addition of nano-TiO 2 and BTMA in the anti-UV coatings could significantly improve the UV light stability of the fabrics.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Haishan Wu,Weiwei Zhang,Junjie Wu,Yuwu Chi
Nowadays, people are facing more and more threats from solar UV radiation due to global ozone layer depletion and the ozone hole. Therefore, it is highly desirable to develop a fast, simple, and sensitive sensor for solar UV radiation. In this work, recently emerging perovskite quantum dots (PQDs) with excellent optical properties are used for sensing solar UV radiation. PQDs with high quantum yields are protected in solid paraffin to obtain paraffin-PQD composite (P-PQD) film. The hydrophobic and compact paraffin not only can protect PQDs from degradation by water and air for long-term use but also is transparent to UV light and thus maintains the high quantum yield of PQDs. The P-PQD film shows high sensing sensitivity for solar UV radiation based on which a novel visual ratiometric luminescence sensing strategy for UV light has been developed. The visual ratiometric luminescence sensor for solar UV radiation adopts a paraffin-encapsulated red fluorescence PQD (P-r-PQD) film as the sensing unit for UV light and a green luminescence light-emitting diode as reference light. When exposed to different solar UV radiation, the sensing film shows wide color variations from green to red, which can easily observed by the naked eye or recorded by a camera. On the basis of this, a simple and visualized solar UV index-reporting system has been established.
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JOURNAL OF HAZARDOUS MATERIALS
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2019
·
IF 7.65
Shumin Zhu,Bingzhi Dong,Yangtao Wu,Lingjun Bu,Shiqing Zhou
Vaccum-ultraviolet (VUV) is effective for elimination of organic contaminants in aqueous environment and degradation of carbamazepine (CBZ) by VUV irradiation was systematically investigated in this study. A dynamic kinetic model was developed to simulate the destruction of CBZ that is mainly initiated by hydroxyl radicals (HO ). The second-order rate constant of the reaction between CBZ and HO was determined to be 1.4 × 10 9 M −1 s -1 . Effect of initial CBZ concentration, VUV irradiation intensity and natural organic matter (NOM) were further investigated in several batch experiments. The predicted CBZ removal rates increased with the increasing VUV intensity, while decreased with the increasing initial CBZ and NOM concentrations. Based on the electrical energy per order (EE/O) calculation, the optimal VUV intensity was determined to be 7.5 × 10 -8 Einstein s −1 . Meanwhile, several intermediates/products were identified and their time-dependent evolution profiles were determined, and finally a plausible degradation pathway of CBZ was proposed. Ecotoxicity assessment indicated that the potential toxicity of CBZ and its oxidation products should be paid more attention in the VUV process.
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Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 9
·4525-4535
·
IF 10.733
Xiaofeng Pan,Qinhua Wang,Runsheng Guo,Yonghao Ni,Kai Liu,Xinhua Ouyang,Lihui Chen,Liulian Huang,Shilin Cao,Mingying Xie
Hydrogel-based strain sensors are promising for skin-like electronics. To satisfy the various requirements of wearable devices used for direct human contact, a hydrogel needs to possess transparent, stretchable, conductive, antifreezing and moisture-retention properties. However, preparation of hydrogels with these properties is challenging. Herein, we innovatively designed and fabricated a transparent, conductive polyvinyl alcohol-tannic acid@talc (PVA-TA@talc) organohydrogel via molecular-level ion conductive channels in ethylene glycol/H2O (EG/H2O), and this organohydrogel integrates excellent conductive, transparent, antifreezing, moisture-retention, toughness, and stretchable properties for the first time. Moreover, this organohydrogel possesses remarkable light filtering capabilities and can effectively filter ultraviolet (UV) light. Interestingly, this organohydrogel can act as a wearable dressing to protect skin from frostbite and ultraviolet radiation. Notably, based on molecular-level ion transport channels, this organohydrogel has great strain sensitivity (gauge factor ≈ 9.17, 0–1.2% strain) that enables recognition of limb movement, pulse, language, and handwriting. The organohydrogel can collect electromyography (EMG) signals as a bioelectrode and be applied to prepare a T-pen for controlling smartphones. In short, this novel organohydrogel has great application prospects for wearable electronics, and the strategy for the organohydrogel constructed via molecular-level ion conductive channels will open a new route for the preparation of multifunctional ionic organohydrogels.
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PROGRESS IN ORGANIC COATINGS
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2018
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IF 2.955
Jiajian Huang,Teng Yuan,Zhicheng Yang,Limin Man,Yang Hu,Zhuohong Yang
With the increasing shortage of petroleum-based resources, the exploitation and application of the polymers derived from the renewable resources has becomes increasingly important for the industrial development. In this work, in order to promote the direct application of tung oil in the coating field, the tung oil-based polymers with the excellent mechanical properties by using cationic photoinitiator as the “green” initiator were prepared. The cationic polymerization mechanism and the optimal polymerization conditions of methyl eleostearate (ME) induced by triarylsulfonium salt (TAS) are characterized via the nuclear magnetic resonance spectroscopy. The effects of different monomers on the properties of tung oil-based polymers and the post curing behaviors of the polymers are studied by dynamic mechanical test and microtensile test. The results display that the heating treatment after UV irradiation is necessary and favorable for the cationic polymerization of ME induced by TAS. And the optimal reaction condition is 500 W of irradiation energy, 5 wt% of initiator concentration, 60 min of irradiation time, 100 °C of heating temperature and 3 h of heating time. Moreover, tung oil-based polymers with good hydrophobicity can be obtained under the optimal reaction condition. In addition, adding 20 wt% divinylbenzene and 10 wt% styrene to the tung oil can effectively increase the mechanical properties and glass transition temperatures (T g ) of tung oil-based polymers.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Jun Bai,Xingang Zuo,Xue Feng,Yunfeng Sun,Qunzi Ge,Xuemei Wang,Changyou Gao
Stimuli-responsive biomaterials supply a promising solution to adapt to the complex physiological environment for different biomedical applications. In this study, a dynamic UV-triggered pH-responsive biosurface was constructed on titania nanotubes (TNTs) by loading photoacid generators, diphenyliodonium chloride, into the nanotubes, and grafting 2,3-dimethyl maleic anhydride (DMMA)-modified hyperbranched poly(l-lysine) (HBPLL) onto the surface. The local acidity was dramatically enhanced by UV irradiation for only 30 s, leading to the dissociation of DMMA and thereby the transformation of surface chemistry from negatively charged caboxyl groups to positively charged amino groups. The TNTs–HBPLL–DMMA substrate could better promote proliferation and spreading of rat bone mesenchymal stem cells (rBMSCs) after UV irradiation. The osteogenic differentiation of rBMSCs was enhanced because of the charge reversal in combination with the titania-based substrates.
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CARBOHYDRATE POLYMERS
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2018
·
IF 5.158
Chuanwei Lu,Juan Yu,Chunpeng Wang,Jifu Wang,Fuxiang Chu
Cellulose-rosin based thermoplastic elastomers with UV absorption properties were fabricated by a combination of rosin, poly(butyl acrylate) (PBA) and ethyl cellulose (EC) via “graft from” ATRP with the aid of EC-rosin macroinitiator (EC- g -(DA)-Br) prepared by a simple esterification reaction between EC, dehydroabietic acid (DA, one of rosin’s resin acids) and 2-bromoisobutylryl bromide. The introduction of rosin affords these elastomers with UV absorption property. And the glass transition temperature of these EC-rosin grafted copolymers could be tuned by changing the content of PBA. Moreover, the introduction of PBA to EC endowed EC- g -(DA)- g -PBA with a good film-forming property and excellent thermoplastic elastomer behavior. All of these EC-rosin grafted copolymers showed an excellent UV absorption performance, and maintained outstanding UV absorption capability after continuous UV-irradiation or being heated to 115 °C for 1 h. As a result, these EC-rosin grafted copolymers have a potential application in coating materials with UV absorption property.
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Royal Society Open Science
·
2018
·Vol. 5
·期 6
·
IF 2.504
Xiangyun Han,Xi Zhang,Lei Zhang,Mei Pan,Jinlong Yan
The photodegradation of benzothiazole (BTH) in wastewater with the coexistence of iron oxides and oxalic acid under UV light irradiation was investigated. Results revealed that an effective heterogeneous photo-Fenton-like system could be set up for BTH abatement in wastewater under UV irradiation without additional H2O2, and 88.1% BTH was removed with the addition of 2.0 mmol l−1 oxalic acid and 0.2 g l−1 α-Fe2O3 using a 500 W high-pressure mercury lamp (365 nm). The degradation of BTH in the photo-Fenton-like system followed the first-order kinetic model. The photoproduction of hydroxyl radicals (·OH) in different systems was determined by high-performance liquid chromatography. Identification of transformation products by using liquid chromatography coupled with high resolution tandem mass spectrometry provided information about six transformation products formed during the photodegradation of BTH. Further insight was obtained by monitoring concentrations of the sulfate ion (SO42−) and nitrate ion (NO3−), which demonstrated that the intermediate products of BTH could be decomposed ultimately. Based on the results, the potential photodegradation pathway of BTH was also proposed.
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Bin Shang,Min Chen,Limin Wu
The biomimetic fabrication of Nepenthes as a new class of liquid-repellent surface materials has attracted much attention recently, but there still remains big challenges, for example, short-serving life, instability, and so forth. Herein, we develop a novel strategy to fabricate robust slippery liquid-repellent coating by the synthesis and use of silicon oil-contained ultraviolet-responsive microcapsules. Owing to the physical and chemical inertness of silicon oil and the substantial randomly dispersed microcapsules in the coating, this nepenthes-like liquid-repellent coating can not only endure different harsh environments but also have excellent long-term self-healing functions.
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