Nano Research
·
2019
·Vol. 12
·期 7
·1733-1738
·
IF 8.515
Dong Lvming,Chen Zhuo,Ye Lei,Yu Yan,Zhang Jianbing,Liu Huan,Zang Jianfeng
Mn-doped all-inorganic perovskite quantum dots (QDs) provide prominent applications in the fields of low-cost light source or display, because of their remarkable properties including dual-color emission and reduced lead content, as well as high photoluminescence quantum yields (PLQYs) and high stability. However, the existing synthesis approaches usually require hash conditions, such as high temperature and nitrogen protection, which is a major hurdler for the practical manufacturing. In addition, the significantly high Mn substitution ratio in CsPbX 3 QDs is still challenging. The real dual-color emission with two strong emission peaks in the Mn-doped all-inorganic perovskite QDs has attracted great interest. Here we present a gram-scale approach to synthesize both CsPb x Mn 1− x Cl 3 and CsPb 1− x Mn x Cl y Br 3− y QDs at 100 °C in the air with high Mn substitution ratio, up to 55.64% atomically. The as-prepared CsPb 1− x Mn x Cl y Br 3− y QDs exhibit high PLQYs of 62.41% and dual-color emission with two strong emission peaks around at 400–450 nm and 600 nm, respectively. The enhanced peak at 400–450 nm is a result of the hybrid halides in CsPbBr x Cl 3− x host. Furthermore, the unique advantage of the optical emission and high PLQYs properties of the CsPb x Mn 1 − x Cl 3 QDs has been demonstrated as invisible ink for encryption applications and polymer composites. Our gram-scale synthesis approach for Mn-doped all-inorganic perovskite QDs may boost the future research and practical applications of QDs-based white LED, spintronics, and molecular barcoding.
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 5
·3095-3109
·
IF 3.917
Wang Weiku,Li Yinhui,Li Weijie,Zhang Baohua,Liu Yaodong
Abstract This study systematically investigated the structural changes of cotton-based microcrystalline cellulose (MCC) during solvent treatment in water and dimethylacetamide (DMAc), as well as how solvent exchange affects the dissolution rates of MCC in LiCl/DMAc solution. When MCC is soaked in DMAc or water for 3 days or longer, the surface cellulose layers become exfoliated from the MCC particles and these exfoliated portions are solvable in LiCl/DMAc. DMAc treatment significantly improves the nano-porosity of MCC. Thus, the chloride anions are able to diffuse into cellulose and lead to the final dissolution of cellulose chains via charge repulsion effects. On the other hand, water treatment exhibits strong pore closing effect, especially for nano-pores with a diameter < 30 nm, which prohibits the diffusion of chloride anions and the final dissolution of cellulose chains.
Graphical abstract
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2019
·Vol. 21
·期 2
·1-13
·
IF 2.009
Li Fang,Huang Haibao,Li Guisheng,Leung Dennis Y. C.
Highly ordered TiO 2 nanotube arrays (TiO 2 NTs) were synthesized by anodization method using a titanium foil and further modified with nanoparticles ( Ø = 2~10 nm) of three platinum group metals (that is, platinum, palladium, and ruthenium) through potentiostatic pulsed electrodeposition method to obtain the composite material. Compared with pure TiO 2 NTs, all the three composite samples (M-TiO 2 NTs, M = Pt, Pd, Ru) showed different enhancement effects on the light responses, as well as different photoelectrochemical performances. In this study, the performance of M-TiO 2 NTs, which worked as photoanode and cathode, was investigated. Ru-TiO 2 exhibited the best degradation yield (~ 85.8%) when applied as photoanode under visible light illumination, which indicated the platinum group metal could also be induced under visible irradiation, not just served as the co-catalyst. M-TiO 2 NTs as cathode were evaluated under the hydrogen evolution reaction (HER). The three M-TiO 2 NT electrodes showed an improved efficiency over pure TiO 2 NTs, while Pt-TiO 2 NTs performed even better (without any sacrificial agent) with higher Faradic efficiency than platinum electrode in the photoelectrocatalytic hydrogen production, which could be explained by the uniform and fine metal nanoparticles on the surface of TiO 2 NTs to offer abundant active sites for the reaction.
In this paper, TiO2 nanotube arrays loaded with nanoparticles of platinum group metals have been explored on their enhancement of photoelectrocatalytic activity. Platinum group metals served as co-catalyst in the surface of TiO2 nanotubes and show great variations in different reactions.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2019
·Vol. 319
·期 3
·1119-1125
·
IF 1.186
Wang Yunhan,Song Hu,Wang Guanquan,Yang Xia,Wang Jing,Wei Hongyuan
In this study, we successfully synthesized polyethylene glycol (PEG) and folic acid (FA) co-functionalized graphene quantum dots (GQDs) to improve the biocompatibility and tumor-targeting ability of GQDs simultaneously, and labeled GQDs–PEG–FA with 131 I for biological behavior evaluation. The in vitro properties, biodistribution and SPECT imaging of 131 I-GQDs–PEG–FA were investigated. The uptake of 131 I-GQDs–PEG–FA at tumor sites can be clearly examined via SPECT imaging, which can ascribe to enhanced permeability and retention effect and active targeting effect of FA to folate receptors. The results indicate that 131 I-GQDs–PEG–FA can be used as a radioactive probe for detection of tumor cells overexpressing folate receptor.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 5
·3786-3794
·
IF 2.993
Li Wen,Chun Fengjun,Fan Xiaoqiang,Deng Wen,Xie Meilin,Luo Chao,Yang Shiyu,Osman Hanan,Liu Chuanqi,Yang Weiqing
All-inorganic halide perovskites have attracted great attention by virtue of the merits of bright emission, tunable wavelength and narrow-band emission. Despite the excellent optical features, all-inorganic halide perovskite materials have suffered from intrinsic instability, which has limited their applications in various optoelectronic devices. To mitigate the intractable issue, we demonstrated the CsPbBr 3 nanoparticles decorated with smaller SiO 2 nanocrystals to passivate the surface defects; SiO 2 nanoparticles were applied as a barrier layer to maintain the optical property and enhance environmental stability. A facile in situ method was proposed to prepare CsPbBr 3 /SiO 2 nanocomposites, in which an environmental ethanol/water solvent system was needed with the addition of tetraethyl orthosilicate (TEOS) as a silicon precursor. The obtained CsPbBr 3 /SiO 2 nanocomposites have better optical characteristic and stability than bare CsPbBr 3 nanoparticles. Even 70% photoluminescence intensity of as-prepared CsPbBr 3 /SiO 2 nanocomposites can be maintained after 168 h storage in ethanol. This newly developed synthesis will open up a new route for the fabrication of optoelectronic devices in an environmentally friendly way, and the as-obtained perovskite materials with improved stability will make them great potential for multifunctional optoelectronic devices.
✓ 已验证
产品关联
DOI
高影响因子
Horticulture Environment and Biotechnology
·
2018
·Vol. 59
·期 6
·835-845
·
IF 1.193
Gong Bi,Huang Shuai,Ye Niu,Yuan Xue,Ma Huiling
We studied the role of ethylene control in regulating energy metabolism, antioxidant enzyme activity, and vase life of cut rose Rosa hybrida ‘Carola’. Rose flowers at stage II were sprayed with one of the following solutions: water (control), 10 μL L −1 1-methylcyclopropene (1-MCP), or 0.5 g L −1 2-chloroethanephosphonic acid (ethephon). After harvest, ethylene production rate, respiration intensity, energy charge (EC), activities of energy metabolism-related and antioxidant enzymes, and malondialdehyde (MDA) content were measured. Results showed that 1-MCP enhanced the activities of superoxide dismutase, H + -adenosine triphosphatase, Ca 2+ -adenosine triphosphatase, succinic dehydrogenase, and cytochrome c oxidase, increased adenosine triphosphate (ATP) content, maintained high EC levels, inhibited respiration intensity, reduced peroxidase (POD) and polyphenol oxidase (PPO) activity and MDA accumulation, and prolonged vase life. Ethephon promoted ethylene production and respiration intensity, increased POD and PPO activity, reduced ATP content and EC levels, and accelerated senescence. Our results support a novel role for ethylene control in regulating senescence of ‘Carola’.
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2018
·Vol. 8
·期 1
·1-13
·
IF 4.122
Cheng Xingan,Ye Jingmin,He Huiqing,Liu Zhanmei,Xu Chunbao (Charles),Wu Bo,Xiong Xialing,Shu Xugang,Jiang Xuhong,Qin Xiangjing
Matrine is a traditional Chinese medicine and botanical pesticide with broad biological activities, including pharmacological and agricultural activities. In present work, two matrine derivatives have been successfully synthesized via introducing indole and cyclohexylamino to 13 position of matrine, respectively, with sophocarpine as starting material, and structurally characterized via infrared spectroscopy(IR), MS, 1 H NMR, 13 C NMR and X-ray crystal diffraction. The results of the in vitro biological activity tests showed that these two matrine derivatives exhibited even better activities against human cancer cells Hela229 and insect cell line Sf9 from Spodoptera frugiperda (J. E. Smith) than that of parent matrine, suggesting that the heterocyclic or cyclic group can dramatically increase the biological activity of matrine. It is worth to mention that 13-indole-matrine could possibly inhibit the growth of insect cells or human cancer cells by inducing cell apoptosis. The results of the present study provide useful information for further structural modifications of these compounds and for exploring new, potent anti-cancer agents and environment friendly pesticides.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 23
·23471-23479
·
IF 2.914
Tao Zhexuan,Deng Jiaqi,Wang Yan,Chen He,Ding Yuan,Hua Xiude,Wang Minghua
A rapid and sensitive immunoassay for the simultaneous detection of imidacloprid and thiacloprid was developed by using magnetic nanoparticles (MNPs) and upconversion nanoparticles (UCNPs). The UCNPs of NaYF 4 :Yb, Er and NaYF 4 :Yb, Tm were synthesized and conjugated with anti-imidacloprid monoclonal antibody (mAb) and anti-thiacloprid mAb as signal labels, while the MNPs were conjugated with antigens of thiacloprid and imidacloprid as separation elements. The fluorescence intensities of Yb/Er- and Yb/Tm-doped UCNPs were detected simultaneously in 544 nm and 477 nm under the excitation of NIR light (980 nm). The amounts of mAb-conjugated UCNPs that were separated by antigen-conjugated MNPs were determined based on competitive immunoassays. Under the optimal conditions, the 50% inhibiting concentration (IC 50 ) and limit of detection (LOD, IC 10 ) were 5.80 and 0.32 ng/mL for imidacloprid and 6.45 and 0.61 ng/mL for thiacloprid, respectively. The immunoassay exhibited negligible cross-reactivity with analogs of imidacloprid and thiacloprid except imidaclothiz (86.2%). The average recoveries of imidacloprid and thiacloprid in environmental and agricultural samples, including paddy water, soil, pears, oranges, cucumbers, and wheat, ranged from 78.4 to 105.9% with relative standard deviations (RSDs) of 2.1–11.9% for imidacloprid and ranged from 82.5 to 102.3% with RSDs of 1.0–16.5% for thiacloprid. In addition, the results of the immunoassay correlated well with high-performance liquid chromatography for the detection of the authentic samples.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
IONICS
·
2019
·Vol. 25
·期 11
·5287-5295
·
IF 2.289
Zhang Anping,Shi Hongxia,Liu Weiqi,Wang Xiaojun,Zhou Yiming,Wu Ping
Tin-based alloys have been regarded as promising anodes to replace commercial carbon materials for Li-ion batteries, but their Li-storage performance, especially cycle life, still fails to meet the requirements for electric vehicles and large-scale electricity storages. Herein, we propose a facile and scalable hydrogel-derived route for uniformly immobilizing sub-10 nm Sn-based alloys within three-dimensional (3D) carbon nanocorals, using polymer-hybridized cyano-bridged coordination polymer hydrogels (cyanogels) as precursors. As a representative example, 3D Sn–Fe@C nanocorals have been constructed through freeze-drying and thermal-autoreduction processes using polyethylene glycol (PEG) hybridized Sn(IV)–Fe(II) cyanogels as precursors. PEG plays critical roles in structural tailoring of hybrid cyanogels and size control of Sn–Fe alloys, and as a result, the average alloy size in optimized Sn–Fe@C nanocoral is only 5.9 nm. The ultrasmall alloy size, uniform dispersity of alloy, as well as coral-like framework structure, enable the Sn–Fe@C nanocorals to exhibit long-term cyclic life and high-rate performance.
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 5
·1-7
·
IF 5.479
Ni Pengjuan,Xie Junfeng,Chen Chuanxia,Jiang Yuanyuan,Zhao Zhenlu,Zhang Yan,Lu Yizhong,Yu Jinghua
The oxidase-like activity of nanoceria is low. This limits its practical applications. It is demonstrated here that pyrophosphate ion (PPi) can improve the oxidase-like activity of nanoceria. Specifically, nanoceria catalyzes the oxidation of colorless 3,3′,5,5′-tetramethylbenzidine (TMB) to give a blue product (oxTMB) with an absorption peak at 645 nm in the presence of PPi. If, however, alkaline phosphatase (ALP) is present, it will hydrolyze PPi, and this results in a decreased oxidase-like activity of nanoceria. Hence, less blue oxTMB willl be formed. On the other hand, if the ALP inhibitor Na 3 VO 4 is added to the system, the oxidase-like activity of nanoceria is gradually restored. On the basis of the above results, a spectrophotometric method was developed for determination of the activity of ALP. It works in the 0.5 to 10 mU.mL −1 activity range and has a 0.32 mU.mL −1 detection limit. Na 3 VO 4 causes a 50% ALP inhibition if present in 71 μM concentration. The assay was successfully applied to the determination of ALP in spiked human serum and gave good recoveries.
Schematic presentation of pyrophosphate (PPi)-induced acceleration of the oxidase-like activity of nanoceria (CeO 2 ) for determination of alkaline phosphatase enzyme (ALP) activity and its inhibitor NaVO 3 .
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TRIBOLOGY LETTERS
·
2019
·Vol. 67
·期 2
·1-14
·
IF 2.235
Yang Ye,Zhang Chenhui,Dai Yuanjing,Luo Jianbin
Effective water-based lubricants for titanium alloys have been investigated. The results reveal that castor oil sulfated sodium salt (CSS) solution can decrease the friction coefficient and adhesive wear compared with water, polyalkylene glycol (PAG) aqueous solution, or castor oil. The surface morphology of the tested discs and balls were measured, and the mechanism investigated. The rubbing surface was analyzed by using time-of-flight secondary-ion mass spectrometry (ToF–SIMS), indicating that a layer of physically adsorbed film remained on the surface, the main ingredient of which was CSS molecules. The mass and morphology of the adsorbed film were explored by quartz crystal microbalance measurements with dissipation monitoring and atom force microscopy, respectively. An electrical voltage, which could change the electrostatic force of the lubricants with the metal surface, was then applied to the frictional pair to explore the mechanism driving the adsorption. The physically adsorbed film played an important role in lubrication. The results of this study indicate that CSS could represent a good water-based lubricant base stock for the design of cutting fluids for titanium alloys.
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 7
·1-10
·
IF 5.479
Lin Bixia,Zhang Tingyun,Xin Xiaolan,Wu Duo,Huang Yan,Liu Yawen,Cao Yujuan,Guo Manli,Yu Ying
Silicon nanoparticles (SiNPs) modified with Eu(III) were synthesized and are shown to be a viable ratiometric fluorescent probe for tetracycline antibiotics. SiNPs/Eu under 405 nm excitation display two emissions, viz. a strong cyan colored fluorescence peaking at 497 nm and a weak pink fluorescence peaking at 622 nm. On addition of tetracyclines (chlortetracycline, tetracycline, doxycycline), the fluorescence at 497 nm is reduced, while the one at 622 nm is increased. Thus, the visible color of fluorescence changes from cyan to pink. This was exploited to design ratiometric fluorometric method for detecting tetracyclines. The method has a limit of detection that is lower by a factor of about 1000 when compared to the use of SiNPs only. A test paper was prepared with the SiNPs/Eu and then applied for the visual semi-quantitative detection of tetracyclines. With the addition of tetracyclines, the test paper exhibited a dosage-sensitive color conversion from cyan to pink with a visually discernible scale as low as 0.4 μM.
Tetracyclines decrease the fluorescence at 497 nm of europium (III) modified silicon nanoparticles (SiNPs/Eu) due to the inner filter effect and increase the one at 622 nm due to an antenna effect. Thus the fluorescence color of SiNPs/Eu changes from cyan to pink. Based on this color switch, a ultrasensitive and visual determination strategy for tetracyclines is proposed.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）