EcoMat
·
2021
·Vol. 3
·期 6
·e12144
·
IF 0
Mengmeng Zhang,Huiying Wang,Zaiyan Hou,Qiang Chen,Zhanjun Xie,Jintao Zhu,Jiangping Xu,Lianbin Zhang
The search and the utilization of alternative water resources to produce freshwater are highly important to the water shortage, especially in arid and desert regions. In these areas, the surface soil moisture (SSM) can be a promising water source, whereas its extraction and following release remain challenging. In this study, a light-responsive bilayered hydrogel (LRBH) is designed to produce freshwater from SSM, which is obtained by the copolymerization of N -isopropylacrylamide (NIPAM) and acrylic acid (AA) and in-situ surface polymerization of polypyrrole (PPy). By careful optimization of the ratio of NIPAM and AA, the water absorption capacity of LRBH is significantly improved with the water absorption of 4.4 g/g even in the sandy soil with an extremely low water content (~3 wt%). The PPy in the top layer of the LRBH can absorb solar light to heat the hydrogel at daytime so that the temperature of the hydrogel can quickly rise above the lower critical solution temperature of LRBH. As a result, the freshwater is quickly expelled from the LRBH. Under simulated solar light irradiation, 68.6% of all absorbed water within LRBH can be released within 20 min. The current study provides an effective and facile strategy for SSM capture and suitable systems for the generation of freshwater in arid or desert regions.
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Polymer Chemistry
·
2021
·Vol. 12
·期 24
·3582-3591
·
IF 5.582
Liulong Guo,Hongxia Yan,Lirong Yan,Lihua Bai,Song Niu,Yan Zhao
Hyperbranched polysiloxanes (HBPSi) have received widespread attention as emerging non-traditional fluorescent polymers. However, they have some drawbacks such as inadequate emission intensity and poor water solubility, which limit their further application in medicine and optoelectronic devices. In this study, a kind of novel HBPSi containing carbon dots (HBPSi-CDs) was prepared by a facile “one step” hydrothermal treatment method. Surprisingly, the synthesized HBPSi-CDs could emit near white light with the CIE coordinates of (0.301, 0.333) via mixing dual emission at 414 and 532 nm when the excitation wavelength was 340 nm. The experimental results show that the 414 nm emission originates from the HBPSi skeleton structure, and the 532 nm emission comes from the carbon dot structure excited with 414 nm light. In addition, HBPSi-CDs shows good water solubility and highly selective quenching to Fe3+ ions. Therefore, HBPSi-CDs shows promising applications in white organic light-emitting diodes (OLEDs) and fluorescent probes.
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高影响因子
FUEL
·
2021
·
IF 6.609
Wenchao Wang,Fashe Li,Hua Wang
The oxidative stability of Jatropha biodiesel after exposure to different wavelengths of visible light was studied and kinetic analysis of the oxidation process was carried out. The results showed that the induction period of Jatropha biodiesel was 5.12 h and visible light at different wavelengths affected the oxidation of biodiesel differently. Effect of oxidation was the strongest in the purple, where the induction period was reduced to 2.65 h. The red had the weakest effect on biodiesel oxidation, and the induction period was reduced to 4.61 h. Acid value detection, component analysis and UV characterization of biodiesel oxidized by visible light at different wavelengths. The results showed that with the decrease of light wavelength, the acid value of the biodiesel increased from 0.2577 mg KOH/g to 0.3438 mg KOH/g and the content of methyl linoleate containing two carbon–carbon double bonds decreases. UV characterization results showed that the absorption peak absorbance of conjugated double bond of Jatropha biodiesel oxidized by purple light was 5.282, while the absorption peak absorbance of conjugated double bond of Jatropha biodiesel oxidized by red light was only 2.877, and purple light was helpful to stimulate the generation of conjugate double bond. The kinetic analysis results showed that the different wavelengths had different rates of biodiesel degradation. Purple light has the fastest oxidation rate. The oxidation rate constant k 1 was 0.06011, the reaction order was n = 1, and the minimum activation energy of the oxidation reaction process was 19.79 kJ·mol −1 .
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Haipeng Wu,Junchen Luo,Xuewu Huang,Ling Wang,Zheng Guo,Jiayi Liang,Shu Zhang,Huaiguo Xue,Jiefeng Gao
Although some groundbreaking work has proved the feasibility of non-contact Marangoni propulsion generated by combination of the superhydrophobicity and photothermal effect, there are still challenges including the strong interfacial adhesion, multifunctional structural design and superior durability. In this paper, a simple two-step spraying method is used to prepare superhydrophobic and multi-functional fluorinated acidified carbon nanotubes (F-ACNTs)/Fe 3 O 4 nanoparticles/polydimethylsiloxane (PDMS) coatings. The introduction of Fe 3 O 4 nanoparticles and F-ACNTs not merely improve the surface roughness but also endow the coating with the outstanding magnetic property and photothermal conversion performance. The PDMS can reduce the surface energy and also improve the interfacial adhesion between the nanofillers and the substrate (the filter paper). The superhydrophobicity can be maintained when the material experiences abrasion, near-infrared (NIR) light irradiation and acid treatment, exhibiting outstanding durability. The highly stable superhydrophobic coating introduces a thin layer of air to decrease the drag force between the filter paper and the water surface, and can be used for controlled self-propelled light-driven motion and magnetic-driven motion. The movement can be manipulated by adjusting the direction of the incident NIR light and magnetic field. In particular, the superhydrophobic and superoleophilic coating based actuators can be easily driven to the oil-contaminated area on the water surface by using a magnet for high efficiency oil removal. This work provides a simple and universal strategy for developing intelligent and multi-responsive actuators possessing promising applications in various fields such as environmental protection, micro-robots and biomedicine.
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PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Xiaoyun Li,Rui Wu,Huan Chen,Ting Li,Huiming Jiang,Xingquan Xu,Xueting Tang,Mimi Wan,Chun Mao,Dongquan Shi
One of the difficulties in atherosclerosis treatment is that the ablation of inflammatory macrophages, repair of vascular endothelial injury, and anti-tissue proliferation should be considered. However, there are few studies that can solve the abovementioned problems simultaneously. Herein, we present a kind of near-infrared (NIR) light-driven multifunctional mesoporous/macroporous tubular micromotor which can rapidly target the damaged blood vessels and release different drugs. Their motion effect can promote themselves to penetrate into the plaque site, and the generated heat effect caused by NIR irradiation can realize the photothermal ablation of inflammatory macrophages. Furthermore, these micromotors can rapidly release the vascular endothelial growth factor for endothelialization and slowly release paclitaxel for antiproliferation to achieve synergistic treatment of atherosclerosis. In vivo results demonstrated that the micromotors can achieve a good therapeutic effect for atherosclerosis. This kind of micro/nanomotor technology with a complex porous structure for drug loading will bring a more potential treatment platform for the disease.
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PubMed
高影响因子
Applied Materials Today
·
2021
·
IF 10.041
Qianxian Yang,Houyang Xu,Hantao Wen,He Zhao,Xiaoya Liu,Yuepeng Cai,Hong Wang,Renfeng Dong
A highly efficient light-driven cuprous oxide @ graphene oxide (Cu 2 O@GO) micromotor which can be propelled with various biocompatible fuels is described. The Cu 2 O@GO micromotors, which achieve enhanced photocatalytic performance by doping Cu 2 O with GO, can be efficiently propelled by visible light and even near infrared light. Compared with conventional plain Cu 2 O micromotors, which can only be driven by visible light, the Cu 2 O@GO micromotors show more than 3 times faster speeds under the full range of visible light with biocompatible glucose fuel. In addition, due to the GO-induced enhanced photocatalytic performance and local photoinduced thermal effects, such motors can be powered by NIR with a series of biocompatible fuels, such as glucose, leucine, and urea solutions, with speeds reaching up to 11.39 µm s −1 (in glucose), which extends the excitation wavelength of photocatalytic micromotors to near-infrared light. This novel strategy of improving the performance of light-driven micromotors via GO doping has opened up a new and attractive path for the preparation of micromotors with potential applications in biological environments.
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高影响因子
Nanoscale Horizons
·
2021
·Vol. 6
·期 3
·238-244
·
IF 10.989
Wenjuan Liu,Xiao Chen,Xiaoyong Ding,Qiang Long,Xiaolong Lu,Qiang Wang,Zhongwei Gu
The controllable synthesis and customized design of micro/nanomotors represents a highly desired paradigm in the field of intelligent nanovehicles. Exploiting asymmetrical structures and geometry-dependent propulsion are the two main strategies for achieving light-driven micro/nanomotors. However, inherent crystal-structure differences in a single colloidal motor have rarely been explored. Here, we propose the first surface-heterojunction-induced propulsion methodology for cuprous oxide (Cu2O) nanomotors, by tailoring the crystal morphology of a Cu2O crystalloid from a sphere into a truncated octahedron and preserving the controllable-index crystal facets of {100} and {111} in a single colloid. Due to the high crystallinity and distinct activity of the exposed crystal facets, a surface heterojunction between the {100} and {111} facets is formed to enhance electron–hole separation, as confirmed by density functional theory (DFT) calculations, thus endowing the truncated octahedral Cu2O nanomotors with autonomous and vigorous movement in biocompatible fuels under visible light. These Cu2O nanomotors can reach a propulsion speed in water of over two times faster than that of polycrystalline spherical motors with low crystallinity. The efficient Cu2O nanomotors offer a promising guideline not only for the synthesis of novel light-driven motors with desired structures, but also for potential applications in biocompatible environments.
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PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 42
·18225-18232
·
IF 3.288
Ji Feng,Yong-Liang Yu,Jian-Hua Wang
Herein, novel carbon dots (CDs) with efficient antibacterial activity are prepared by a simple cyclization reaction of 4-formylbenzoic acid and pyrrole and cross-linking with p-phenylenediamine at room temperature. The CDs exhibit the fluorescence property of red emission, greatly reducing the noise interference from bacterial autofluorescence in fluorescence imaging. At the same time, the CDs with the feature of red absorption facilitate the achievement of light excitation of deep tissues in the living body. Owing to the introduction of the porphyrin ring structure as a photosensitizer, the CDs are able to trigger the generation of singlet oxygen. When excited by a 638 nm laser and irradiated for 20 min, 10 μg mL−1 CDs can achieve complete bacterial extinction. Laser confocal microscopy imaging further demonstrates that the CDs act on the outside of bacteria and generate reactive oxygen species under red light irradiation, providing a non-multidrug resistant sterilization method.
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高影响因子
Science Advances
·
2020
·Vol. 6
·期 39
·
IF 13.117
Yaqin Jiang,Pengfei Fu,Yanyan Liu,Chaochao Wang,Peiran Zhao,Xu Chu,Xingwu Jiang,Wei Yang,Yelin Wu,Ya Wang,Guohua Xu,Jin Hu,Wenbo Bu
Traumatic spinal cord injury (SCI) is caused by external physical impacts and can induce complex cascade events, sometimes converging to paralysis. Existing clinical drugs to traumatic SCI have limited therapeutic efficacy because of either the poor blood–spinal cord barrier (BSCB) permeability or a single function. Here, we suggest a “pleiotropic messenger” strategy based on near-infrared (NIR)–triggered on-demand NO release at the lesion area for traumatic SCI recovery via the concurrent neuroregeneration and neuroprotection processing. This NO delivery system was constructed as upconversion nanoparticle (UCNP) core coated by zeolitic imidazolate framework–8 (ZIF-8) with NO donor (CysNO). This combined strategy substantial promotes the repair of SCI in vertebrates, ascribable to the pleiotropic effects of NO including the suppression of gliosis and inflammation, the promotion of neuroregeneration, and the protection of neurons from apoptosis, which opens intriguing perspectives not only in nerve repair but also in neurological research and tissue engineering.
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高影响因子
Asian Journal of Organic Chemistry
·
2021
·Vol. 10
·期 3
·668-673
·
IF 3.319
Yuan Chen,Fo-Yun Lu,Rui-Xue Li,Zhi Guan,Yan-Hong He
Graphical A visible light-mediated reaction of N -phenylpropynamide with diethyl 2,2-dibromomalonate has been developed for the synthesis of bromo-substituted azaspirotrienedione. This method avoids the use of transition metals, peroxides and other substances that are harmful to the environment. Through radical addition/ipso-cyclization/oxidation cascade reaction, C−Br, C−C and C=O bonds can be formed in one pot. Various substituents of N -arylpropynamide are well tolerated and yield of the target product is up to 95%. A visible-light-mediated reaction of N -phenylpropynamides with diethyl 2,2-dibromomalonate for the synthesis of bromo-substituted azaspirotrienediones has been developed. This method allows the formation of C−Br, C−C and C=O bonds in one pot via a cascade radical addition/ipso-cyclization/oxidation process. A possible radical mechanism involving single electron transfer and energy transfer processes is proposed based on control experiments, cyclic voltammetry determination and Stern-Volmer quenching experiments.
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高影响因子
LANGMUIR
·
2020
·
IF 3.557
Liang Zhao,Changzhen Yin,Ting Long,Peng Hu,Zhenyu Yang
Colloidal perovskite nanocrystals (NCs) have shown promise in visible and near-infrared light emission compared with conventional quantum dots because of their sharp and highly efficient emission. Light-driven halide exchange offers high degrees of tunability of perovskite NC composition and photoluminescence properties. A remaining challenge is the incomplete change between bromide and chloride due to the presence of radical quenchers. Herein, an optimized in situ halide exchange method of perovskite NCs is reported. Chloroform is used as the solvent and the precursor to effectively generate halide radicals and ions under ultraviolet light irradiation in an inert atmosphere. This strategy achieves complete crystal transformation in colloidal perovskite NCs such as CsPbBr3-to-CsPbCl3 and Cs4PbBr6-to-CsPbCl3. The exchange reaction rate can be further tuned by the presence of B-site dopants such as Zn2+ and Ce3+. The dopant cations are partially remained in the exchanged perovskite NCs, indicating the predominance of thermodynamic control in the crystal transformation.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jie Guo,Qiang Hu,Min Lu,Asu Li,Xiaoyu Zhang,Ren Sheng,Ping Chen,Yu Zhang,Jinlei Wu,Yuhao Fu,Guang Sun,William W. Yu,Xue Bai
One-dimensional (1D) semiconductor nanorods (NRs) are very promising materials for light-emitting diodes (LEDs) due to their unique optoelectronic properties, while the research on 1D perovskite NRs is relatively rare. Herein, the 1D CsCdBr 3 perovskite NRs were synthesized by simple thermal injection method, in which the [CdX 6 ] 4- octahedra sharing opposite faces can form infinite linear chains along the c axis. But their low photoluminescence quantum yields (PL QYs) limit their application in LEDs. To improve the optoelectronic properties of CsCdBr 3 NRs, the PbBr 2 is chosen as the dopant to synthesize the Pb 2+ doped CsCdBr 3 perovskite NRs. When the molar ratio of PbBr 2 :CdBr 2 is 0.25, the perovskite NRs with the PL QYs of 48% and pure-blue emission centered at 459 nm were obtained. Furthermore, the optimized NRs were used as the emissive layer to fabricate a perovskite LED that is the only one blue perovskite LED based on 1D NRs. This device shows bright pure-blue emission with good spectral stability, suggesting that the 1D perovskite NRs are good choice to achieve next-generation lighting and display.
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高影响因子
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