Nature Communications
·
2021
·Vol. 12
·期 1
·1-7
·
IF 14.919
Zhang Mingming,Zhao Lili,Xie Jiahao,Zhang Qian,Wang Xiaoyu,Yaqoob Najma,Yin Zhengmao,Kaghazchi Payam,Zhang San,Li Hua,Zhang Chunfeng,Wang Lei,Zhang Lijun,Xu Weigao,Xing Jun
Low-dimensional hybrid perovskites have demonstrated excellent performance as white-light emitters. The broadband white emission originates from self-trapped excitons (STEs). Since the mechanism of STEs formation in perovskites is still not clear, preparing new low-dimensional white perovskites relies mostly on screening lots of intercalated organic molecules rather than rational design. Here, we report an atom-substituting strategy to trigger STEs formation in layered perovskites. Halogen-substituted phenyl molecules are applied to synthesize perovskite crystals. The halogen-substituents will withdraw electrons from the branched chain (-R-NH 3 + ) of the phenyl molecule. This will result in positive charge accumulation on -R-NH 3 + , and thus stronger Coulomb force of bond (-R-NH 3 + )-(PbBr 4 2− ), which facilitates excitons self-trapping. Our designed white perovskites exhibit photoluminescence quantum yield of 32%, color-rendering index of near 90 and chromaticity coordinates close to standard white-light. Our joint experiment-theory study provides insights into the STEs formation in perovskites and will benefit tailoring white perovskites with boosting performance.
研究领域:
材料科学
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光学工程
·
化学
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DOI
高影响因子
NANO LETTERS
·
2020
·
IF 11.238
Rui Feng,Qixiang Wang,Yiming Qiao,Runheng Yang,Shun An,Fanchen Meng,Shengtao Yu,Wei Hao,Benwei Fu,Peng Tao,Kehang Cui,Chengyi Song,Wen Shang,Tao Deng
A simple, fast, and contactless alternative for the generation of nanodroplets in solution is to apply light to stimulate their formation at a surface. In this work, a light-driven mechanism for the generation of nanodroplets is demonstrated by using a porous membrane. The membrane is placed at the interface between oil and water during the nanodroplet generation process. As light illuminates the membrane a photothermal conversion process induces the growth and release of water vapor bubbles into the aqueous phase. This release leads to the fluctuation of local pressure around the pores and enables the generation of oil nanodroplets. A computational simulation of the fluid dynamics provides insight into the underlying mechanism and the extent to which it is possible to increase nanodroplet concentrations. The ability to form nanodroplets in solutions without the need for mechanical moving parts is significant for the diverse biomedical and chemical applications of these materials.
研究领域:
材料科学
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生物医学工程
·
流体力学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
·
IF 14.229
Huimin Hao,Ji-Long Shi,Hui Xu,Xia Li,Xianjun Lang
TiO 2 is the most established semiconductor photocatalyst . The prominence of TiO 2 is becoming increasingly obvious because its interfacial redox reactions have implication on a wide range processes such as energy conversion and environmental remediation. Herein, we exploited the surface complex created by the interaction between organic molecules with binding sites and accommodating surface of TiO 2 for visible light-driven selective aerobic oxidation reactions. A novel surface complex formed between N -hydroxyphthalimide (NHPI) and TiO 2 was discovered. The NHPI-TiO 2 complex turned out to be an outstanding visible light photocatalyst and was successfully used in the selective oxidation of amines into imines with atmosphere O 2 under blue LED irradiation. The stability of the NHPI-TiO 2 complex was preserved by 3 mol% of (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO) acting as a cooperative catalyst. Moreover, selectivities for the imine products were also promoted by TEMPO. Superoxide anion radical (O 2 − ) were evidenced to be the primary reactive oxygen species (ROS) to execute the oxidative conversions. This work suggests that TiO 2 surface complexes can be robust photocatalysts for visible light-driven selective aerobic reactions, provided that an appropriate cooperative redox catalyst exists to channel the photocatalytic electron transfer.
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DOI
高影响因子
Polymers
·
2018
·Vol. 10
·期 1
·65
·
IF 2.935
Zhenhua Wang,Zhen Li,Yen Wei,Yan Ji
Vitrimers represent a new class of smart materials. They are covalently crosslinked like thermosets, yet they can be reprocessed like thermoplastics. The underlying mechanism is the rapid exchange reactions which form new bonds while breaking the old ones. So far, heating is the most widely used stimulus to activate the exchange reaction. Compared to heating, light not only is much more convenient to achieve remote and regional control, but can also offer fast healing. Gold nanospheres are excellent photothermal agents, but they are difficult to disperse into vitrimers as they easily aggregate. In this paper, we use polydopamine to prepare gold nanospheres. The resultant polydopamine-coated gold nanospheres (GNS) can be well dispersed into epoxy vitrimers, endowing epoxy vitrimers with light responsivity. The composites can be reshaped permanently and temporarily with light at different intensity. Efficient surface patterning and healing are also demonstrated.Keywords:gold nanospheres;vitrimers;light responsive
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 13
·9983-9994
·
IF 3.442
Yang Meng,Wang Linlin,Cheng Yongbin,Ma Ke,Wei Xinran,Jia Pengxiang,Gong Yongkuan,Zhang Yang,Yang Jingfa,Zhao Jiang
A self-healing hydrogel was synthesized via the multi-component reaction of azobenzene-methacrylamide, β-CD and 3-methacrylamido phenylboronic acid. The orthogonal method was applied to analyze the influence of host–guest inclusion complexation, cross-linker and phenylboronic acid monomers content on mechanical properties and healing efficiency of the hydrogel. The results indicated that hydrogel showed autonomic self-healing behavior. The hydrogel demonstrated light-switchable self-healing ability and pH-sensitive swelling ratio. It was found that hydrogel showed high elongation, excellent resilience and low elastic hysteresis. The design of the combined host–guest interactions and boronate esters on the hydrogel showed advantage for improving the mechanical, self-healing and recovery properties simultaneously.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Dan Wang,Zhen Hou,Fengling Wang,Hui Zhang,Jiwei Jiang,Bin Dong
Light-driven rotary actuators have undergone tremendous progress in recent years and show great potential for different applications ranging from sensors, soft robots to micro–nano intelligent systems. However, most photoactuators with rotary motions have a low rotational speed due to their low responsive speed and small driving force, which hinder both their fundamental and practical research. In this paper, we report a fast rotation of a soft actuator in response to light, which harnesses the synergistic interactions between two binary responsive components, i.e. water responsive agar and photothermally responsive polypyrrole, leading to a structural protrusion at the irradiation center that provides a jet-propulsion when the gas expands to the edge of the film. Interestingly, the motion behavior of the photoactuator film could be well controlled from the in-place rotation to horizontal motion as a result of the fast rotation with a speed as high as 5200 rpm. The current study indicates a fast rotation could be realized by the simple design and fabrication, which may not only stimulate the exploration of new motion behaviors for photothermal actuators but also open up new opportunities for their practical applications.
研究领域:
材料科学
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智能系统
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2023
·
IF 7.4
Dongliang Li,Wei Li,Rong Chen,Xun Zhu,Dingding Ye,Yang Yang,Qiang Liao
Precision manipulation of particle-enrichment patterns in droplets is challenging but important in biochemical analysis and clinical diagnosis. Herein, a light strategy for precisely manipulating particle enrichment patterns is reported. Focused laser irradiation to the droplet induces a Marangoni flow owing to a localized photothermal effect, which carries in-droplet particles and concentrates them at the laser-spot-acted region. Owing to high flexibility of light, multiple particle-enriched sites are formed in a droplet, and the concentrated particles can be transported and reconstructed on demand. In addition to the island-like enrichment pattern, this optical particle manipulation strategy enables the formation of various particle-enriched patterns, such as the line-shape and circle-shape patterns. Further, light directly acts on the working fluid instead of target particles, considerably weakening dependence on particle properties. For particles whose density is similar to that of the working fluid, a portion of particles can still be concentrated. It is also found that only a small portion of submicron particles can be concentrated, while nanoparticles are hardly concentrated by this light strategy. Moreover, high reconfigurability of light enables in-parallel high-throughput operations, which is demonstrated using two laser beams to form two particle enrichment sites in a droplet simultaneously. Finally, this light strategy is also demonstrated by concentrating cells and nucleic acid molecules. This work paves the way for the applications of optofluidics in cell sorting, point-of-care analysis, and drug screening.
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry B
·
2016
·Vol. 5
·期 6
·1155-1158
·
IF 4.872
Zuguang Shen,Guocheng Han,Xiaoying Wang,Jiwen Luo,Runcang Sun
This study reported the direct utilization of bagasse as an ultra-light aerogel with AgNPs for the first time. Firstly, AgNPs were synthesized in situ using a green route with bagasse, a by-product of the refined sugar industry. During the reaction, the crystalline region of cellulose in bagasse was destroyed, and some groups of bagasse were partly oxidized into CO of ketone, which confirms the reducing capacity of bagasse. Then, the obtained bagasse–AgNP composite was dissolved in EmimAc to prepare an aerogel with AgNPs. The aerogel piled up in slices, and its weight after swelling in water was about 19 times the dry weight, and the aerogel did not crush a flower branch because its density was only 0.035 g cm−3, although the mole and mass ratios of the Ag atom were 5.26% and 29.94% in the aerogel, respectively. Furthermore, the obtained aerogel showed a strong antibacterial effect, especially against E. coli and P. aeruginosa. This study not only provides an interesting way for bagasse to be applied directly, but also develops an antibacterial biomass-based ultra-light aerogel without AgNP dissociation.
研究领域:
材料科学
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环境科学
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微生物学
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产品关联
DOI
PubMed
高影响因子
Nanoscale Advances
·
2021
·Vol. 3
·期 9
·2475-2480
·
IF 4.553
Zhihui Tian,Heshan Zhang,Fei Xiu,Minjie Zhang,Jiahao Zou,Chaoyi Ban,Yijie Nie,Wenjie Jiang,Bin Hu,Juqing Liu
Electronic textiles (e-textiles) typically comprise fabric substrates with electronic components capable of heating, sensing, lighting and data storage. In this work, we rationally designed and fabricated anisotropic light/thermal emitting e-textiles with great mechanical stability based on a sandwich-structured tri-electrode device. By coating silver nanowire network/thermal insulation bilayer on fabrics, an anisotropic thermal emitter can be realized for smart heat management. By further covering the emissive film and the top electrode on the bilayer, light emitters with desirable patterns and colors are extracted from the top surface via an alternative current derived electroluminescence. Both the light and thermal emitting functions can be operated simultaneously or separately. Particularly, our textiles exhibit reliable heating and lighting performance in water, revealing excellent waterproof feature and washing stability.
研究领域:
材料科学
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电子工程
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产品关联
DOI
PubMed
高影响因子
Cells
·
2023
·Vol. 12
·期 19
·2351
·
IF 6
Ziqi Zhou,Yan Zhang,Simin Xia,Xi Chen
Immunosuppressants are emerging as promising candidates for cancer therapy with lower cytotoxicity compared to traditional chemotherapy drugs; yet, the intrinsic side effects such as immunosuppression remain a critical concern. Herein, we introduce a photoactivatable antitumor immunosuppressant called dmBODIPY-FTY720 (BF) that shows no cytotoxicity but can be temporally and locally activated by deep-red light illumination to induce tumor cell apoptosis. To further reduce potential side effects, we integrate BF with another classic photosensitizer called methylene blue (MB) that is activated under the same wavelength of deep-red light (>650 nm) and successfully establish a red-light-activatable AND Boolean logic gate through a mechanism that we found to be synergetic apoptotic induction. At further decreased dosages, deep-red light illumination does not induce cell death in the presence of either BF or MB, but significant cancer cell death is triggered in the presence of both drugs. Therefore, the dosage of BF is further reduced, which will be highly beneficial to minimize any potential side effects of BF. This AND-gated strategy has been successfully applied in vivo for effective suppression of hepatocarcinoma tumors in living mice.Keywords:antitumor immunosuppressant;FTY720;logic gate;BODIPY photocage;red light;photodynamic therapy
研究领域:
癌症治疗
·
药理学
·
光化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOID AND POLYMER SCIENCE
·
2023
·Vol. 301
·期 6
·655-663
·
IF 2.4
Wang Zhen,Leng Kangwei,Liu Jiuhong,Li Yueqiu,Liu Shucheng,Li Yan,Wang Zhongwei,Yu Qing,Han Yuxi
Poly(methyl methacrylate) microspheres with narrow particle size distribution were synthesized successfully under visible light (LED@420 nm) in this study, and no RAFT agent was involved. A novel acylphosphine oxide, (2,4-dimethylphenyl) phenylphosphine oxide (2,4-DMTPO), was used as the photoinitiator. Uniform microspheres with the weight-average diameter (D w ) of 1.03 μm and polydispersity index (PDI) of 1.06 were obtained upon irradiation for 30 min, when the ratio of methyl methacrylate (MMA) to solvent was 1:10, the amount of polyvinylpyrrolidone (PVP) and 2,4-DMTPO was 30 wt% and 2 wt% of MMA, respectively. However, no microspheres could be detected instead of large blocks when (2,4,6-trimethylbenzoyl) diphenylphosphine oxide (TPO) was the photoinitiator under the same condition. It could be due to the higher light absorption ability and quantum yield of 2,4-DMTPO at 420 nm than TPO. A possible formation mechanism of PMMA microspheres was proposed and the effects of photoinitiator, MMA, irradiation time, and PVP were discussed. Results shown that regular microspheres were formed when the irradiation time exceeded 30 min, and the amount of PVP was in the range of 25 to 40 wt% of MMA. Lowering the amount of photoinitiator to 0.5 wt% resulted in ca. 66% and 4% decrease of D w and PDI, respectively. This study may provide a rapid and energy saving way of synthesizing monodispersed PMMA microsphere, which would be benefit for the fields of coating, template, and so on.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Qing Chen,Jinyue Dai,Peizhan Cao,Guangming Lu,Xiaoqing Liu
Building benzoxazine coatings on large equipment is of great practical importance and challenging. In this work, a main-chain type benzoxazine (MCBZ) resin that can be quickly shaped under UV light was successfully synthesized and can be directly coated into a film. In addition, it had a wide processing window, low curing temperature, excellent static antifouling effect, and sterilization effect. The d12-DHBP-MCBZ resin was prepared from dodecamine, which ensured the sterilization effect, and 4, 4′-dihydroxy-benzophenone provided the photoinitiation sites and activated the oxazine ring. By adjusting the ratio of d12-DHBP-MCBZ to TMPTMA, hydrophilic benzoxazine coatings can be prepared, suitable for fouling-resisting coatings. The results indicated that the d12-DHBP-MCBZ resin could be quickly shaped under UV light, and the post-curing temperature was only 140 °C. In particular, the coatings' excellent hydrophilicity can effectively prevent fouling organisms' adhesion and improve the static antifouling effect. It was worth mentioning that Poly (BZ/20 %TMA) coating achieved a high sterilization performance of >99 %. These works gave us a new strategy to solve application problems of benzoxazine coatings on large equipment and antifouling coating efficiency problems.
研究领域:
材料科学
·
海洋生物学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）