ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 33
·2302038
·
IF 19
Hui Liu,Huan Luo,Jianying Huang,Zhong Chen,Zhihua Yu,Yuekun Lai
An intelligent fiber actuator that can sense, adapt, and interact with environmental stimuli is highly desirable for numerous applications. However, conventional fiber sensors have difficulty in responding to complex environments with fast sensing and actuation. Herein, water/light dual-responsive double-twisted RGO@HHF (hollow hydrogel fiber loaded with reduced graphene oxide) actuators are successfully developed based on dynamic self-contraction/elongation via twisting, folding, plying, and re-plying process. Under stimuli by water and light, the twisted RGO@HHF provides a forward and reverse torsional stroke of 3168 and 60° cm −1 , respectively. The excellent swelling properties endow the fiber with highly effective water-responsive ability, and the hollow structure can reduce the water required for fiber to swell. Meanwhile, the RGO loading further accelerates water evaporation and enhances the light response rate of the fiber. After twisting and re-plying, the double-twisted RGO@HHF exhibits highly increased elongation and contraction under light/water stimulation. On this basis, a new strategy is proposed for efficient desalination and anti-salt accumulation. The double-twisted RGO@HHF can elongate to absorb water and contract to evaporate seawater under sunlight/water stimulation, respectively. The accumulated salt can be dissolved in the seawater during the dynamic process. This study provides a promising approach for realizing sustainable seawater desalination.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Lan Xia,Long Yuan,Kai Zhou,Jing Zeng,Kailian Zhang,Guocan Zheng,Qiang Fu,Zhining Xia,Qifeng Fu
Mussel-inspired polydopamine (PDA) and its derivative materials have exhibited a huge potential as a facile and versatile route to fabricate multifunctional coatings on virtually any substrate surface. However, their performance and applicability are frequently obstructed by limited optical absorption in visible regions of PDA and poor surface adhesion persistence of dopamine solutions. Herein, we report a facile strategy to improve these problems by rationally regulating the dopamine polymerization pathway through mixed-solvent-mediated periodate oxidation of dopamine. The spectral analysis, ultrahigh-performance liquid chromatography coupled with high-resolution mass spectrometry, and density functional theory simulations systematically demonstrate that the mixed-solvent reaction systems can effectively accelerate the periodate-induced formation of cyclized moieties in the PDA microstructure and inhibit their further oxidative cleavage, thus contributing to narrowing the inherent energy band gap of PDA and improving the long-lasting surface deposition performance of aged dopamine solutions. Moreover, the newly constructed cyclized species-rich PDA coatings have excellent surface uniformity and significantly enhanced chemical stability. Benefiting from these fascinating properties, they have been further used for permanent dyeing of natural gray hair with remarkably improved blackening effect and excellent practicability, which exhibited their promising prospect in real-world applications.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
·
IF 8.7
Mei Fang,Qi Li,Daozheng Yang,Bing Zhou,Yuezhan Feng,Chuntai Liu
Effective utilization of abundant solar energy can help alleviate the global energy shortage. In this work, a flexible sandwich structured transparent photothermal film was prepared by sequentially spray coating MXene conductive layer as core, and spin coating polydimethylsiloxane (PDMS)-Fe 3 O 4 protective layer as skin onto polycarbonate (PC) substrate. Due to the synergistic light-to-heat conversion effects of MXene and Fe 3 O 4 nanoparticles, as well as the thermal insulation effect of PDMS layer that prevent heat from diffusing into air, the obtained PC/MXene/PDMS-Fe 3 O 4 films (PMPF 0.5 ) exhibited a satisfying photothermal conversion performance (72.6 °C at 100 mW/cm 2 ) with high visible transmittance exceeding 54%. Moreover, the PDMS-Fe 3 O 4 coating endowed the film with high hydrophobicity (120°), expanding its application in humid environment. Combing with these excellent photothermal performance, transparency, flexibility and hydrophobicity, PMPF film exhibits a highly potential using in space thermal management, such as greenhouses.
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POLYMER TESTING
·
2023
·
IF 5.1
Xiaohu Chen,Yonggui Liu,Junfeng Li,Tuck-Whye Wong,Tao Chen,Ting Zhang,Li Wang
Smart materials can dynamically react to environmental stimuli and thus change at the micro or macro scale. However, when exposed to harsh conditions, damage can occur to them to varying degrees, thus affecting their performance and service life. In this study, a recyclable shape memory polyurethane material with self-healing properties was prepared using polycaprolactone (PCL) and polytetrahydrofuran diol (PTMG) as raw materials and isofuranone diisocyanate (IPDI) as a cross-linking agent. Dynamic cross-linking networks are constructed by introducing reversible disulfide bonds to enhance the self-healing and recyclable properties of the materials. Hydroxylated multiwalled carbon nanotubes (MWCNTs-OH), as photothermal particles, impart a remote response ability to the material, making the material temperature variable under near-infrared radiation (NIR). The shape memory recovery of CNT-PCL-PTMG can be triggered remotely and precisely controlled the irradiated NIR area. The results of tensile tests, scanning electron microscopy (SEM) and optical microscopy (OM) show that 3% CNT- 5 PCL- 5 PTMG can achieve efficient and rapid self-healing. Additionally, the synergistic effect of transesterification and the dynamic exchange of disulfide bonds gives materials reprocessability for recycling use. The material is promising as an alternative material for soft robotics and smart sensors.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Hanxu Lu,Zhe Hu,Hong Liu,Zizhao Fu,Hanqing Dai,Wanlu Zhang,Ruiqian Guo
Transition-metal-ion-doped quantum dots (QDs) are promising candidates to fabricate full-spectrum white-light-emitting diodes (WLEDs). In this work, a series of efficient white-light-emitting Cu,Mn-codoped ZnGaS/ZnS (Cu,Mn:ZnGaS/ZnS) QDs were synthesized by controlling the Zn/Ga molar ratio and the amounts of Mn dopants. After ZnS shelling, the photoluminescence quantum yield reached 58% and the spectrum almost covered the whole visible spectrum. Further, the stepwise doping process was investigated, which had considerable reference value to subsequent research. The Cu,Mn:ZnGaS/ZnS QDs were employed to fabricate WLEDs displaying a color rendering index of 94 and CIE coordinates of (0.34, 0.35).
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Polymer Chemistry
·
2021
·Vol. 12
·期 48
·7056-7064
·
IF 5.582
Shufan Feng,Zhiqiang Wang,Huihui Xu,Sifan Li,Xueqing Gong,Jianli Hua
In recent years, polymeric photocatalysts have attracted worldwide attention due to their diverse synthetic approaches, tunable energy band and electronic structure. However, their photogenerated charge transfer is hindered by the lack of crystallinity, thus limiting their photocatalytic activity. In this work, four poly(perylene diimide) (poly(PDI)) photocatalysts (U-PDI, OA-PDI, MA-PDI and BU-PDI) with urea, oxalamide, malondiamide and biuret as the connecting groups were synthesized, respectively. Their photocatalytic oxygen production activity and charge transfer kinetics were investigated. It was found that BU-PDI exhibited the highest oxygen evolution rate (OER) of 46.80 μmol h−1 (2345 μmol g−1 h−1) under visible-light irradiation, which is 2.03 times higher than that of urea based U-PDI. The high OER of BU-PDI is mainly attributed to its interlayer hydrogen bond-enhanced crystallinity, which enhances the built-in electric field by avoiding dipole cancellation resulting by the disordered assembly and thus leads to an excellent charge transfer and separation capability. Moreover, to further expand its application in the utilization of solar energy, BU-PDI was used for the photodegradation of tetracycline and showed an excellent degradation rate and stability. This work may contribute to the development of photocatalysts for applications in photocatalytic water splitting and sewage treatment.
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Applied Sciences-Basel
·
2021
·Vol. 11
·期 22
·10854
·
IF 2.679
Jingyun Mao,Huiling Zhong,Xinpin Liu,Qingrong Qian,Yongjin Luo,Liren Xiao,Hun Xue
The development of a facile method for the synthesis of GaN:ZnO solid solution, an attractive material with a wurtzite-type structure, is vital to enhance its photocatalytic activity toward H2evolution. Herein, GaN:ZnO solid solution nanorods with diameters of around 180 nm were fabricated by combining the electro-spun method with a sequentially calcinating process. Photocatalytic water-splitting activities of the as-obtained samples loaded with Rh2−yCryO3co-catalyst were estimated by H2evolution under visible-light irradiation. The as-prepared GaN:ZnO nanorods at a nitridation temperature of 850 °C showed the optimal performance. Careful characterization of the GaN:ZnO solid solution nanorods indicated that the nitridation temperature is an important parameter affecting the photocatalytic performance, which is related to the specific surface area and the absorbable visible-light wavelength range. Finally, the mechanism of the GaN:ZnO solid solution nanorods was also investigated. The proposed synthesis strategy paves a new way to realize excellent activity and recyclability of GaN:ZnO solid solution nanorod photocatalysts for hydrogen generation.Keywords:GaN:ZnO solid solution nanorods;electrospinning technology;hydrogen evolution;visible-light photocatalysis
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Nanomaterials
·
2021
·Vol. 11
·期 11
·3098
·
IF 5.076
Boyu Zhang,Sixiang Zhao,Yingying Yu,Ming Li,Liancheng Zhao,Liming Gao
Circularly polarized light (CPL) detection and polarization state recognition are required for a wide range of applications. Conventional polarization detection with optical components causes difficulties for miniaturization and integration. An effective design strategy is proposed for direct CPL detection with chiral material. Here, we realized direct CPL detection based on the combination of chiral photonic cellulose nanocrystal (CNC) and ultraviolet-sensitive ZnO photoconductive material. The CNC layer deposited by evaporation-induced self-assembly established the left-handed chiral nematic structure with a photonic bandgap (PBG) to recognize left-handed CPL (LCPL) and right-handed CPL (RCPL) at specific wavelengths. The PBG of CNC layer has been modulated by the adjustment of chiral nematic pitch to match the semiconductor bandgap of ZnO film in ultraviolet region. The photocurrents under RCPL and LCPL are 2.23 × 10−6A and 1.77 × 10−6A respectively and the anisotropy factor Δgpcof 0.23 is acquired for the CPL detection based on the chiral photonic CNC. This design provides a new approach to the detection of CPL polarization state with competitive performance.Keywords:circularly polarization light detection;cellulose nanocrystal;ZnO photoconduction
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DIAMOND AND RELATED MATERIALS
·
2021
·
IF 3.315
Xiaoyan Meng,Wenxin Yang,Xin Deng
Additive manufacture of diamond tools has rarely been investigated to date. In this study, ultraviolet (UV) curable diamond–resin slurries with diamond contents from 6.25 to 25 vol% have been prepared to produce diamond-resin composites via 3D printing using digital light processing . The rheological properties and cure behavior of UV-curable slurries were examined. The results demonstrated that all slurries exhibited typical shear-thinning behavior, and the viscosity of each corresponding slurry noticeably increased as the diamond content increased from 0 to 25 vol%. Regarding the cure behavior, the cure depth and cure width of the slurries were increased and decreased by increasing the exposure time and solid loading, respectively. The mechanical and thermal properties of printed specimens were then characterized. The flexural strength of specimens decreased from 40 to 23.9 MPa with increase in the diamond contents from 0 to 18.75 vol% and appeared to plateau above 18.75vol% of diamond loading. Although the flexural strength increased with increase in the exposure time from 2 to 10 s, the optimal exposure time was 4 s. The geometric accuracy gradually decreased, and specimen deformation occurred when the exposure time exceeded 4 s. Results of the thermogravimetric analysis indicated that the addition of diamond to the slurry improve the specimens thermal stability.
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JOURNAL OF CHROMATOGRAPHY A
·
2021
·
IF 4.759
Yuhao Han,Panpan Chen,Zhichao Li,Xiao Wang,Chenglong Sun
Ultraviolet (UV) light-catalyzed Paternò-Büchi (PB) reaction has been developed as an efficient lipid C=C double bond (DB) derivatization strategy, which can accurately assign the position of C=C bond in unsaturated lipids when coupled with tandem mass spectrometry (MS/MS). Inspired by this, here we proposed a novel visible-light induced [2+2] cycloaddition reaction combined with ESI-MS/MS and MALDI-MS/MS to identify lipid C=C position isomers. Benz[g]isoquinoline-5,10-dione (BIQD) and 6,9-difluorobenzo[g]isoquinoline-5,10-dione (DF-BIQD) were developed as a new type of [2+2] cycloaddition reagent, which can not only react with C=C bond under 254 nm UV light irradiation, but also quickly combine with lipid C=C bond under the irradiation of 405 nm visible-light and > 400 nm compact fluorescent lamp visible-light. High cycloaddition reaction conversion efficiency can be achieved by irradiating under compact fluorescent lamp light for 2 min. Moreover, we discovered that 437 nm, 489 nm, 545 nm, 581 nm, and 613 nm monochromatic light appearing in compact fluorescent lamp can individually induce the [2 + 2] cycloaddition reaction between DF-BIQD and unsaturated lipids. Using this method, we found that the expressions of lipid DB-positional isomers in rat heart, brain, lung, spleen, thymus, kidney, liver and plasma vary greatly. The relative content of FA-18:1 (Δ9) in rat heart is only 1.49 times that of FA-18:1 (Δ11), while the relative content of FA-18:1 (Δ9) in rat plasma is 5.20 times that of FA-18:1 (Δ11). The above results offer new insight into the development of photocatalytic reagent for visible-light induced [2+2] cycloaddition and structural lipidomic studies.
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CHEMICAL PHYSICS LETTERS
·
2021
·
IF 2.328
Xi Wang,Jiali Yan,Hao Wang,Daoli Yang,Jinli Zhai,Xiaoya Gao,Chao Gong,Wenjie Zhu,Yongming Luo
To use solar energy effectively, BiOX (Cl, Br, I) nanosheets with reasonable band gap structure were prepared by ultrasonic assisted hydrothermal method. The prepared BiOX (Cl, Br, I) nanosheets removed 90% of CBZ within 5 min, showing rapid degradation kinetic of 0.3858 min −1 . The improved photocatalytic activities can be due to the reduced recombination of photoinduced electron-hole pairs, strong visible-light absorption ability, large surface area and pore. Radicals experiments indicated that the BiOX (Cl, Br, I) generated main holes ( h + ) and minor electrons ( e − ) to degrade CBZ. These results demonstrated the good feasibility of BiOX (Cl, Br, I) nanosheets in the degradation of CBZ under simulated solar light irradiation.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Anjli Sharma,Sanjeev Kumar Kanth,Shishi Xu,Ni Han,Lei Zhu,Lele Fan,Chao Liu,Qinfang Zhang
A highly potential visible light active g-C 3 N 4 /Bi 4 NbO 8 X (Cl, Br) heterojunction photocatalysts were constructed at the interface of the coupling between Bi 4 NbO 8 X (Cl, Br) and g-C 3 N 4 . The band gap value of heterojunctions g-C 3 N 4 /Bi 4 NbO 8 Br-20% (CNBNB-3), g-C 3 N 4 /Bi 4 NbO 8 Cl-20% (CNBNC-3), and pristine materials g-C 3 N 4 (CN), Bi 4 NbO 8 Cl and Bi 4 NbO 8 Br were analyzed to be 2.68 eV, 2.69 eV and 2.74 eV, 2.46 eV and 2.48 eV, respectively. The degradation performance of optimized CNBNC-3 and CNBNB-3 photocatalysts revealed much superior removal efficiency of 97% and 84% than the pristine material for rhodamine B. The synthesized photocatalysts maintained good recyclable stability after five consecutive cycles and potentially capable of pollutant degradation. The electrochemical impedance and photoluminescence spectroscopy revealed that the migration and separation efficiency of photogenerated charge carriers of photocatalyst were boosted, while reduced recombination rate was observed. The photocatalytic reaction mechanism also revealed the superoxide ·O 2 − and • OH radicals are the main active species responsible for the pollutant degradation.
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