Materials Horizons
·
2021
·Vol. 8
·期 11
·3063-3071
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IF 13.266
Hongtai Ren,Hu Jin,Jian Shu,Jie Xie,Erlong Wang,Du-An Ge,Shi-Yang Tang,Xiangpeng Li,Weihua Li,Shiwu Zhang
The controlled actuation of liquid metal (LM) droplets has recently shown great potential in developing smart actuating systems for applications in robotics. However, there is a lack of a simple approach for the precise manipulation of multiple LM droplets in a 2D plane, which hinders the development of complex control over droplets for realizing useful robotic applications. To overcome this challenge, here, a versatile and powerful light-induced manipulation of LM droplets is presented. The key principle is to selectively activate phototransistors in an electrolyte using infrared laser beams to electrically control LM droplets via Marangoni forces. This approach shows the ability of inducing concurrent motion, splitting, and merging of multiple LM droplets simply using light without complex and bulky systems. Parameters affecting the manipulation of LM droplets are thoroughly investigated. Moreover, a vehicle carrier driven by wheels composed of multiple LM droplets for making a light-controlled relay is demonstrated. We believe such a light-induced control method for manipulating LM droplets has the potential for advancing the development of future field-programmable robotics and droplet-based soft collaborative robots.
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高影响因子
PROPELLANTS EXPLOSIVES PYROTECHNICS
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2021
·Vol. 46
·期 9
·1480-1488
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IF 1.887
Zhiping Huang,Shengliang Xu,Xinli Chen,Min Wang,Hua Yuan,Huali Zhao,Yuanyuan Zhang
Green-light emitting illuminant and green pearls that are currently being used for pyrotechnics are mainly composed of barium carbonate and polyvinyl chloride (PVC), which lead inevitably to the substantial generation of abundant harmful products for environmental pollution. There is thus considerable scope for the development of a novel emitting illuminant with an improved “green” composition instead of compositions incorporating barium based oxidants and polyvinyl chloride for environmental protection. For this purpose, a new composition composed of boron carbide, potassium perchlorate, and guanidine nitrate with a suitable burning rate of 5∼15 mm/s required for fireworks, the high luminous intensity of 34665 Cd and spectral purity of 67.1 % at a primary wavelength of 562 nm was developed. Notably, PM10 data demonstrated that the new composition generated less than half the amount of the smoke relative to the original one. More importantly, all of the safety parameters of this new formulation meet well with the standards’ requirements, i. e ., a remarkable low sensitivity to friction (0 %) and impact (8 %), relative stability to electric discharge (374.4 mJ), flame (14.0 cm) and heating (unburned, unexploded at 75 °C for 48 h), as well as a high ignition temperature of 504.0 °C and a low moisture absorption rate (0.66 %). Taken together, the new emitting illuminant developed herein showed great potential to be used for fireworks and signal flare in both military and civilian applications.
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JOURNAL OF SOLID STATE CHEMISTRY
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2021
·
IF 3.498
Cong Lu,Weidong Wu,Haifeng Zhou
A novel visible-light-driven BiOBr/BiFeWO 6 heterojunction was prepared through a simple hydrothermal route. The physicochemical properties of BiOBr/BiFeWO 6 nanocomposites were systematically characterized. The existence of a clear interface between BiOBr and BiFeWO 6 could be obtained by transmission electron microscopy , indicating the formation of heterojunction. Rhodamine B (RhB) was used to investigate the photocatalytic performance of BiOBr/BiFeWO 6 nanocomposites under visible light irradiation (λ > 420 nm). The degradation efficiency of BiOBr/BiFeWO 6 -40 nanocomposite reached 96.3 % within 90 min. The improved photocatalytic performance is mainly due to the synergistic interaction between BiOBr/BiFeWO 6 . It is beneficial to the separation of photogenerated carriers and the absorption of visible light. In addition, long-term stability results indicate that BiOBr/BiFeWO 6 heterojunction may be an excellent material for effective degradation of dyes from wastewater and may be explored for large-scale application in the future. Finally, a possible mechanism is proposed for the catalytic degradation of RhB by the BiOBr/BiFeWO 6 heterojunction. This work provides a convenient and dependable method to synthesize BiOBr/BiFeWO 6 nanocomposite, which might be a promising candidate for large-scale application in wastewater treatment.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 14
·19424-19433
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IF 2.478
Guo Chengbin,Hu Rong,Qiao Hui,Duan Chenguang,Qi Xiang
Titanium dioxide (TiO 2 ) has been widely studied in the field of photocatalysis. However, the development of TiO 2 was limited by the photoresponse only in the ultraviolet region and the rapid recombination of photogenerated electron–hole pairs. In this work, we prepare a novel TiO 2 and two-dimensional (2D) bismuth selenide (Bi 2 Se 3 ) hybrid nanosheets (TiO 2 /Bi 2 Se 3 HNs) via a simple water bath ultrasonic route. X-ray diffraction pattern and Raman spectra were carried out to confirm that as-prepared samples were pure and well crystalized. Besides, TEM characterization proves that 2D Bi 2 Se 3 nanosheets have high specific surface area and it can be clearly observed that the TiO 2 with 60 nm particles are uniformly supported on the surface. Furthermore, photoelectrochemical (PEC) measurements demonstrate that the TiO 2 /Bi 2 Se 3 HNs exhibit excellent photocatalytic performance of 4.3 µA/cm 2 under 100 W of visible light, which were almost 2.5 times that of pure TiO 2 . More importantly, our results show that the photocurrent density was quite stable and only dropped by 10% after 125 cycles. In summary, the improved photocatalytic activity is due to the unique characteristic of 2D Bi 2 Se 3 nanosheets, such as maximized reaction sites and good electrical conductivity, and the positive coupling effect of the TiO 2 /Bi 2 Se 3 heterojunction. These extraordinary properties make the TiO 2 /Bi 2 Se 3 HNs photocatalysts have excellent potential for photocatalytic application.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Yawei Jiang,Yan Mi,Chufan Li,Wenjian Fang,Xiaochuan Li,Xianghua Zeng,Yongsheng Liu,Wenfeng Shangguan
The solid solution constructed by two or more semiconductors with different bandgaps can effectively modulate the energy band, satisfying the redox potential for both H + /H 2 and O 2 /H 2 O. In this paper, Sillen-Aurivillius compounds with layered structure Bi 3 O 4 Cl and Y 3 O 4 Cl solid solution (Bi 3−x Y x O 4 Cl) were successfully synthesized by the solid-phase method. The absorption edge of Bi 3−x Y x O 4 Cl could be dramatically changed from about 500–740 nm with the increase of Bi elements, which accounted for the entire UV-Vis region of the solar spectrum. Furthermore, the bandgaps for Bi 3−x Y x O 4 Cl could be adjusted from about 2.6–2.0 eV with the decreased Y/Bi ratio from 2 to 0.2. Significantly, the conduction band minimum energy (CBM) of Bi 3−x Y x O 4 Cl all satisfied the redox potential for H + /H 2 , which showed excellent visible-light photocatalytic water splitting.
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ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 47
·2105383
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IF 18.808
Lijun Kuang,Jinghuan Huang,Yutong Liu,Xiaolin Li,Yuan Yuan,Changsheng Liu
Effective treatments to overcome osteoblast/osteoclast imbalance are the key to achieving desirable bone regeneration for osteoporosis patients. When used for local bone repair, parathyroid hormone (PTH) often leads to either excessive osteoclasts under continuous exposure or insufficient osteoclasts with pulsatile release of PTH. Herein, an injectable multifunctional in situ-generated calcium phosphate nanoparticle (ICPN)-coordinated poly(dimethylaminoethyl methacrylate-co-2-hydroxyethyl methacrylate) (DHCP) hydrogel loaded with PTH for near-infrared (NIR)-stimulated release is developed to achieve bone regeneration in an ovariectomized (OVX) model. Photothermal-responsive poly(N-acryloyl glycinamide-co-acrylamide) PNAm-indocyanine green ICG-PTH microspheres (PIP MSs) endow a dual-mode release system with a sustained release at low concentrations, a pulse release of PTH, and in situ pore formation properties. The PIP MS-encapsulated DHCP hydrogel (DHCP-10PIP/d) is injected into the bone defects of OVX rats. Under NIR irradiation, the localized photothermal effects trigger on-demand PTH release and in situ micropores formation through the gel–sol transition of PIP MSs, and the repeated treatment is harmless to the bioactivity of PTH. This platform can enhance osteoblast and osteoclast activity at the same time both in vitro and in vivo and repair the cranial defects of OVX rats successfully. Overall, this work provides a promising strategy for PTH delivery to repair osteoporotic bone defects.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
·
IF 19.503
Shuaiqi Gong,Xue Teng,Yanli Niu,Xuan Liu,Mingze Xu,Chen Xu,Lvlv Ji,Zuofeng Chen
Zero-dimensional quantum dots (QDs) and two-dimensional nanosheets represent two kinds of distinctive materials with unique properties. Here, we describe the fabrication of step-scheme ( i.e. S-scheme) 0D/2D heterostructure with InVO 4 QDs and g -C 3 N 4 (CN) ultrathin nanosheets for photocatalytic CO 2 reduction. The formation of S-scheme heterostructure facilitates the separation of electron-hole pairs and reduces the recombination of charge carriers. Moreover, the light-absorption edge of InVO 4 /CN is extended to 605 nm because of the strong visible light absorption of InVO 4 QDs. The 0D/2D hybrid enables highly selective photocatalytic reduction of CO 2 to CO (93.3 %) at a decent rate of 69.8 μmol g −1 h −1 under visible light irradiation. Density functional theory (DFT) results suggest that the formation of InVO 4 /CN heterostructure can enhance CO 2 adsorption/activation, stabilize COOH* intermediates and allow rapid CO desorption as the major product. This study opens up a new possibility for construction of novel S-scheme heterostructure for photocatalytic applications.
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NANOTECHNOLOGY
·
2021
·Vol. 32
·期 50
·505611
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IF 3.874
Huilian Hao,Yue Zhao,Tianliang Song,Xu Wang,Changwang Li,Wenyao Li,Wenzhong Shen
Herein, we report an enhanced red emission from colloidal silicon nanocrystals (c-Si NCs) solution-processed light-emitting diode. c-Si NCs were synthesized by facile femtosecond laser ablation. Based on the structural characterization and opto-electrics properties analysis, both photoluminescence and electroluminescence arise from the radiative recombination of carriers due to quantum confined effect. The optical power density and highest external quantum efficiency have been obtained to be 0.79 mW cm−2 and ∼6.6%, respectively. These results indicate that Si NCs are very attractive as a potential optical source for future integrated chips.
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Journal of Nanomaterials
·
2021
·
IF 2.986
Chunbei Wu,Chuxin Zhou,Yuanyuan Chen,Zhigang Peng,Jun Yang,Yuanming Zhang
A Bi-BiOBr/BiPO4 heterojunction structure was successfully synthesized via a two-step solvothermal method with ethylene glycol as a reducer. Little BiPO4 irregular polyhedrons and little metal Bi spherical nanoparticles were uniformly dispersed on the surface of BiOBr nanosheets with intimate contact and formed a heterojunction structure between BiPO4 and BiOBr. It was found that Bi-BiOBr/BiPO4 had a significant improvement in photocatalytic performance for RhB degradation compared to bare BiOBr and BiPO4. The photocatalytic degradation rate constant of 0.2-Bi/BiOBr/BiPO4 was 1.44 h-1, which was 3.8 times and 14.2 times more than that of bare BiOBr and BiPO4, respectively. This is attributed to the formation of a ternary heterojunction, which benefits the separation of photogenerated electron-hole pairs. Furthermore, with the introduction of metal Bi, the SPR effect of metal Bi can effectively improve the absorption ability of Bi-BiOBr/BiPO4 photocatalyst, resulting in enhanced photoactivity. In this work, the mechanism of photocatalytic degradation was studied by using the photochemical technique and the capture experiment of active species, and it was revealed that h+ and ⋅O2- played a major role in the photocatalytic process.
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ACS Omega
·
2021
·
IF 3.512
Dan Zhao,Lijun Song,Linxi Hou
Developing an appropriate method to broaden the color of long persistent luminescence materials has important scientific significance and practical value but remains a great challenge. Herein, we have developed a unique strategy to fine-tune the persistent luminescence using the inclusion complex of rhodamine 6G with (2-hydroxypropyl)-β-cyclodextrin as efficient light conversion materials. The emitting color of the novel persistent luminescence material could be tuned from green to orange by changing the concentration of the light conversion agent. Furthermore, afterglow decay measurements showed that the initial afterglow brightness is 9.65 cd/m2, and the initial afterglow brightness gradually decreased as the cyclodextrin inclusion compound coating increased. This design concept introduces a new perspective for broadening the luminescence color of afterglow phosphors, which may open up new opportunities for persistent luminescence materials toward many emerging applications.
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CELLULOSE
·
2019
·Vol. 27
·期 2
·743-753
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IF 3.917
Chen Junyu,Mao Liucheng,Qi Hongxu,Xu Dazhuang,Huang Hongye,Liu Meiying,Wen Yuanqing,Deng Fengjie,Zhang Xiaoyong,Wei Yen
Abstract In recent years, cellulose nanocrystal (CNC) based materials have attracted great research attention for different applications owing to their unique properties and facile modification chemistry. In this work, CNC based thermo-responsive fluorescent composites were successfully prepared via the metal-free surface-initiated atom transfer radical polymerization (ATRP) of NIPAAm and a Schiff base containing dye (HDPAP). Results demonstrated CNC-poly (NIPAAm–HDPAP) composites display sensitive temperature-responsive coil-to-globule transition behavior at the temperature of lower critical solution temperature. The bright fluorescence offered by the Schiff base dye (HDPAP) was also confirmed by fluorescence spectra. Moreover, the preparation method of light meditated ATRP was proved to become the promising way in fabrication of multifunctional nanomaterials for its incomparable advantages, including low energy consumption, high efficiency, good monomer adaptation, free of transition metal ions. Graphic abstract
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Environmental Science-Nano
·
2019
·Vol. 6
·期 10
·3123-3132
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IF 7.704
Weihua Fei,Yun Song,Najun Li,Dongyun Chen,Qingfeng Xu,Hua Li,Jinghui He,Jianmei Lu
Visible-light active hollow In2O3@ZnFe2O4 heterojunctions are obtained through loading ZnFe2O4 nanosheets on hollow In2O3. First, uniform-size hollow In2O3 is prepared via thermal annealing of hexagonal In-MIL-68. Then layered double hydroxide (ZnFe-LDH) nanosheets are electrodeposited on the outer surfaces of the hollow In2O3 and annealed into ZnFe2O4. This unique design incorporates two oxide semiconductors into a Z-scheme heterojunction with hollow structure and nanosheet subunits, which can enhance visible-light absorption, inhibit the recombination of photogenerated charges and expose abundant active sites for further reaction. Thus, the resulting heterostructures exhibit a more efficient degradation efficiency of tetracycline (TC) under visible-light irradiation. The optimized In2O3@ZnFe2O4 photocatalyst exhibits a 90% photodegradation rate of TC (50 mg L−1) in 30 min. In addition, the In2O3@ZnFe2O4 heterojunction shows excellent cycling stability and can be easily separated for recycling in view of its excellent stability and unique magnetic properties, which are advantageous for further application in environmental purification.
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