ACS Applied Nano Materials
·
2022
·
IF 6.14
Guo Li,Changxue Dong,Genshuai Sun,Mingzhe Li,Xin Cao,Li Zhou,Tao Chen,Fan Yang
Doping is a simple method to modulate the electronic configuration of semiconductor photocatalysts. This study regulated the energy band structure of CdSe nanosheets by Ag doping, which reduced the energy bandwidth of CdSe nanosheets by increasing the carrier density, thereby improving the efficiency of the photocatalytic reduction of uranium by CdSe nanosheets. A 96% removal of U(VI) was achieved by 3% Ag-CdSe nanosheets, which was 1.9 and 1.2 times higher than that of pristine CdSe nanosheets (50%), and 1% Ag-CdSe nanosheets (81%), respectively. Additionally, at pH = 4.0 and a solid–liquid ratio of 0.25, the reduction of uranium by 3% Ag-CdSe nanosheets (765 mg/g) was 2.2 times higher than that of pristine CdSe nanosheets (345.6 mg/g). This study provides a new idea for other efficient photocatalysts designed for uranium reduction.
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Analytical Methods
·
2023
·Vol. 15
·期 8
·1037-1046
·
IF 3.1
Zhaoyan Yang,Shenfei Zong,Guohua Jiang,Kai Zhu,Ziting Qian,Kuo Yang,Zhuyuan Wang,Yiping Cui
All-inorganic perovskite nanocrystals (CsPbX3 NCs, X = Cl, Br, I) are promising fluorescence materials for biological detection due to their excellent optical properties. However, there is still a challenge to obtain stable CsPbX3 NCs with more biofunctions. Here, we proposed a distinct strategy by absorbing the functionalized metal nanoprobes onto the phospholipid encapsulated CsPbX3 NCs to achieve CsPbX3-metal hybrids as probes for the detection of tumor-derived exosomes. Here, the metal nanoprobes have two functions: first, it endows phospholipid encapsulated CsPbX3 NCs with recognition ability; second, it avoids the fluorescence quenching of CsPbX3 NCs during the biological modification process by using metal nanoparticles as a bridge to connect with CsPbX3 NCs and various biomolecules. The obtained CPXD–AD exhibited a bright fluorescence signal, narrow full width at half-maximum (FWHM), and high specificity. Under optimal conditions, the CPXD–AD-based fluorescence-linked immunosorbent assay (FLISA) was successfully established and used for both qualitative and quantitative detection of tumor-derived exosomes.
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高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 20
·8036-8045
·
IF 4.569
Shengqi Xu,Lu Yang,Yixuan Wei,Yiming Jia,Meiqi Hu,Lianxia Bai,Junzheng Zhang,Xinxin Li,Shuo Wei,Jun Lu
Converting CO2 into valuable solar fuels through photocatalysis has been considered a green and sustainable technology that is promising for alleviating global warming and providing energy in an environmentally friendly manner. However, traditional photocatalysts generally suffer from low surface-reactive reaction sites, inefficient light harvesting and rapid recombination of electron–hole pairs. Lead halide perovskite materials have been considered ideal semiconductor photocatalysts for photocatalytic CO2 reduction due to their tunable band gaps, strong light absorption, and low cost. Herein, a series of L2Csn−1PbnX3n+1 (L = ba, ha, oa; X = Cl, Br, I; n = 1, 2) 2D layered perovskites were synthesized by a facile solvothermal method. The effects of alkyl amine chain length, halogen atoms and inorganic layer number on their properties were studied. More importantly, these 2D materials were used as photocatalysts for CO2 reduction without any sacrificial agents. These 2D perovskites exhibited markedly increased performance in comparison with 3D bulk materials, benefitting from the larger surface-area-to-volume ratio and faster and more efficient exciton dissociation, which achieved the highest CO yield of 158.69 μmol g−1 h−1 and CH4 yield of 6.9 μmol g−1 h−1 through the design of the photocatalytic system. In addition, the influence of light source conditions on photocatalysis was studied systematically, including light source intensity and wavelength. The experimental results indicated that an appropriate solvent, high light intensity and monochromatic light source matching the wavelength of exciton absorption can effectively improve the photocatalytic efficiency.
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JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
·
2022
·
IF 5.062
Xiuqiong Chen,Qingmei Zhu,Yanshi Wen,Zhengyue Li,Shanshan Cao,Huiqiong Yan,Qiang Lin
To examine if the improvement of the molecular flexibility for the reductive-amination of oxidized alginate derivative (RAOA) through chemical modification could be conducive to the enhancement of alginate electrospinnability, we attempted to use the electrospinning technology to develop the alginate derivative electrospun composite nanofibers that can load the hydrophobic anti-inflammatory drug, ibuprofen , with the aid of polyvinyl alcohol (PVA). The synthesized RAOA was examined by FT-IR spectrometer, 1 H NMR spectrometer and fluorescence spectrophotometer. Furthermore, the effects of surface tension, electrical conductivity and rheological properties of the RAOA/PVA blend solution on the electrospinning property and fiber morphology of the resultant RAOA/PVA electrospun composite nanofibers were explored by surface tension meter, conductivity meter, rheometer and SEM. Subsequently, the drug loading and release mechanism of ibuprofen from the RAOA/PVA electrospun composite nanofibers were analyzed through the simulated drug release test. In addition, the cytotoxicity of the RAOA/PVA electrospun composite nanofibers was also evaluated with L929 cells by Cell Counting Kit-8 (CCK-8) assay. Experimental results showed that the hydrophobic side groups were successfully grafted onto the alginate backbone by the oxidation-reductive amination reaction, which destroyed the intramolecular hydrogen bond of the raw sodium alginate (SA), thus enhancing the molecular flexibility and colloidal interface activity of RAOA. So the RAOA could exhibit good amphiphilic property with the critical aggregation concentration (CAC) of 0.42 g/L in NaCl solution, and form the self-assembled micelle with the average hydrodynamic diameter of 615 nm (PDI = 0.24) and zeta potential at about −66.5 mV. Although the oxidation-reductive amination reaction for the modification of RAOA could not fundamentally achieve the generation of bead-free nanofibers by electrospinning of single RAOA aqueous solution, it could improve the electrospinning performance of RAOA/PVA blend solution and increase its content in the RAOA/PVA electrospun composite nanofibers. Furthermore, the fabricated RAOA/PVA electrospun composite nanofibers exhibited the high encapsulation efficiency (EE) and sustained-release property in comparison with the 50/50 SA/PVA electrospun composite nanofibers, due to the good affinity of RAOA to hydrophobic ibuprofen that achieve the loading and controlled release of the hydrophobic drug. Besides, the RAOA/PVA electrospun composite nanofibers exhibited low cytotoxicity to L929 cells. Therefore, the resultant RAOA/PVA electrospun composite nanofibers, combining the structural characteristics of the electrospun nanofibers and the properties of RAOA including the good self-assembly performance, colloidal interface activity, sustained release performance and good cytocompatibility, may possess great potentials as the functional wound dressings for biomedical applications.
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高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Yun Tang,Ben Liu,Nan Yan,Xiaoqiang He,Hudie Yuan,Yalou Xin,Hongfeng Yin
Widespread application of YAG:Ce-based white light-emitting diodes (WLEDs) is being challenged due to the lack of red emission, leading to their poor color rendering index (Ra) and high correlated color temperature (CCT). Perovskite quantum dots (QDs), presenting high photoluminescence quantum yield and simple fabrication process have been recognized as promising red-emitting component for warm WLEDs. However, conventional method by mechanically mixing QDs with YAG:Ce always results in undesirable dispersion due to their huge size difference. Moreover, the two components display different sinking behavior in silicone , which would further deteriorate the color uniformity of WLED. To address these issues, in this study, red-emitting MAPbBr 3-x I x QDs-coated YAG:Ce (A-YAG@QDs) composites were successfully prepared to further fabricate WLED with compensated red emission. The chemical coordination interactions between QDs and functionalized YAG:Ce make the two components behave as a whole, which effectively avoids the dispersion and sinking-related issues. The WLED, which combined blue LED chip and A-YAG@QDs composite, exhibited warm white light with low CCT of 4474 K, high Ra of 90.1 and high value of saturated red color component R9 as 95. This study demonstrated a promising strategy to prepare QDs-coated phosphor composites for the generation of warm white light for indoor lighting application.
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Polymers
·
2022
·Vol. 14
·期 4
·694
·
IF 4.967
Zhaowen Liu,Xiuqiong Chen,Zhiqin Huang,Hongcai Wang,Shirui Cao,Chunyang Liu,Huiqiong Yan,Qiang Lin
In this paper, we developed an organic solvent-free, eco-friendly, simple and efficient one-pot approach for the preparation of amphiphilic conjugates (Ugi-OSAOcT) by grafting octylamine (OCA) to oxidized sodium alginate (OSA). The optimum reaction parameters that were obtained based on the degree of substitution (DS) of Ugi-OSAOcT were a reaction time of 12 h, a reaction temperature of 25 °C and a molar ratio of 1:2.4:3:3.3 (OSA:OCA:HAc:TOSMIC), respectively. The chemical structure and composition were characterized by Fourier transform infrared spectroscopy (FTIR),1H nuclear magnetic resonance (1H NMR), X-ray diffraction (XRD), thermogravimetry analyser (TGA), gel permeation chromatography (GPC) and elemental analysis (EA). It was found that the Ugi-OSAOcT conjugates with a CMC value in the range of 0.30–0.085 mg/mL could self-assemble into stable and spherical micelles with a particle size of 135.7 ± 2.4–196.5 ± 3.8 nm and negative surface potentials of −32.8 ± 0.4–−38.2 ± 0.8 mV. Furthermore, ibuprofen (IBU), which served as a model poorly water-soluble drug, was successfully incorporated into the Ugi-OSAOcT micelles by dialysis method. The drug loading capacity (%DL) and encapsulation efficiency (%EE) of the IBU-loaded Ugi-OSAOcT micelles (IBU/Ugi-OSAOcT = 3:10) reached as much as 10.9 ± 0.4–14.6 ± 0.3% and 40.8 ± 1.6–57.2 ± 1.3%, respectively. The in vitro release study demonstrated that the IBU-loaded micelles had a sustained and pH-responsive drug release behavior. In addition, the DS of the hydrophobic segment on an OSA backbone was demonstrated to have an important effect on IBU loading and drug release behavior. Finally, the in vitro cytotoxicity assay demonstrated that the Ugi-OSAOcT conjugates exhibited no significant cytotoxicity against RAW 264.7 cells up to 1000 µg/mL. Therefore, the amphiphilic Ugi-OSAOcT conjugates synthesized by the green method exhibited great potential to load hydrophobic drugs, acting as a promising nanocarrier capable of responding to pH for sustained release of hydrophobic drugs.Keywords:amphiphilic conjugates;sodium alginate;nanocarrier;self-assembly;sustained release
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Photonics Research
·
2022
·Vol. 10
·期 3
·628-636
·
IF 7.254
Qian Xiong,Qian Xiong,Qian Xiong,Qian Xiong,Sihao Huang,Zijun Zhan,Juan Du,Juan Du,Juan Du,Juan Du,Xiaosheng Tang,Xiaosheng Tang,Zhiping Hu,Zhengzheng Liu,Zeyu Zhang,Weiwei Chen,Yuxin Leng,Yuxin Leng,Yuxin Leng,Yuxin Leng
In recent years, all-inorganic halide perovskite quantum dots (QDs) have drawn attention as promising candidates for photodetectors, light-emitting diodes, and lasing applications. However, the sensitivity and instability of perovskite to moisture and heat seriously restrict their practical application to optoelectronic devices. Recently, a facile ligand-engineering strategy to suppress aggregation by replacing traditional long ligands oleylamine (OAm) during the hot injection process has been reported. Here, we further explore its thermal stability and the evolution of photoluminescence quantum yield (PLQY) under ambient environment. The modified CsPbBr3 QDs film can maintain 33% of initial PL intensity, but only 17% is retained in the case of unmodified QDs after 10 h continuous heating. Further, the obtained QDs with higher initial PLQY (91.8%) can maintain PLQY to 39.9% after being continuously exposed in air for 100 days, while the PLQY of original QDs is reduced to 5.5%. Furthermore, after adhering CsPbBr3 QDs on the surface of a micro SiO2 sphere, we successfully achieve the highly-efficient upconversion random laser. In comparison with the unmodified CsPbBr3 QDs, the laser from the modified CsPbBr3 QDs presents a decreased threshold of 79.81 μJ/cm2 and higher quality factor (Q) of 1312. This work may not only provide a facile strategy to synthesize CsPbBr3 QDs with excellent photochemical properties but also a bright prospect for high-performance random lasers.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Xinyu Cao,Chuang Xiong,Xinyu Zhao,Shujuan Yang,Qiyan Wen,Haiyun Tang,Qu Zeng,Yuhong Feng,Jiacheng Li
Delivering effectively zero-valent selenium nanoparticles (SeNPs) and develop its functions in more fields is still a challenge. Herein, a novel template for the preparation and stabilization of SeNP-based surfactants was developed, amphiphilic sodium alginate (APSA), which can self-assemble into micelles in an aqueous solution. Primarily, physicochemical properties of SeNPs stabilized by APSA with different molecular weights were compared and the interaction mechanism of APSA/SeNPs was investigated. Moreover, a functional Pickering emulsion (PE) was presented using the SeNP-based surfactants. Results showed that high molecular weight-stabilized SeNPs had small particle size (54.72 nm) and great stability due to the hydrogen bonding between Se atoms and APSA. The “soft” particle-decorated SeNPs with interface activity formed a dense interfacial layer on the oil-water interface, which exhibited excellent antioxidant properties. The contents of lipid hydrogen peroxide (LH) and malondialdehyde (MDA) were significantly reduced by 88.7% and 63.4%. Overall, SeNPs stabilized by APSA have great application potential as an emulsifier and antioxidant in industrial field.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Jing Xu,Yinbing Liu,Peilong Chen,Ao Wang,Ke-jing Huang,Linxia Fang,Xu Wu
Currently, the development of polyvalent ions battery systems are still restricted by lacking suitable cathode materials with high energy density and long cycle life attributing to sluggish kinetic mechanism and of polyvalent ions. Herein, an effective inter-layer scaling strategy is proposed by using a simple hydrothermal method . The super layer spacing VS 2 (∼1 nm) cathode dramatically improves electrochemical performance of zinc-ion batteries (ZIBs) and magnesium/lithium hybrid ion batteries (MLIBs). The specific discharge capacities of ZIBs and MLIBs are 450.7 and 488.8 mA h g −1 at current density of 0.1 A g −1 which are much higher than the same type of battery systems. Finally, the diffusion mechanism and the corresponding theoretical model is established by adopting first principles . In brief, the work provides an effective strategy for the large scale application of multivalent and hybrid batteries systems.
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MOLECULES
·
2022
·Vol. 27
·期 7
·2191
·
IF 4.927
Yingbiao Xu,Yefei Wang,Tingyi Wang,Lingyu Zhang,Mingming Xu,Han Jia
Various nanoparticles have been applied as chemical demulsifiers to separate the crude-oil-in-water emulsion in the petroleum industry, including graphene oxide (GO). In this study, the Janus amphiphilic graphene oxide (JGO) was prepared by asymmetrical chemical modification on one side of the GO surface with n-octylamine. The JGO structure was verified by Fourier-transform infrared spectra (FTIR), transmission electron microscopy (TEM), and contact angle measurements. Compared with GO, JGO showed a superior ability to break the heavy oil-in-water emulsion with a demulsification efficiency reaching up to 98.25% at the optimal concentration (40 mg/L). The effects of pH and temperature on the JGO’s demulsification efficiency were also investigated. Based on the results of interfacial dilatational rheology measurement and molecular dynamic simulation, it was speculated that the intensive interaction between JGO and asphaltenes should be responsible for the excellent demulsification performance of JGO. This work not only provided a potential high-performance demulsifier for the separation of crude-oil-in-water emulsion, but also proposed novel insights to the mechanism of GO-based demulsifiers.Keywords:heavy oil-in-water emulsion;demulsification;Janus graphene oxide;molecular dynamic simulation
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Catalysis Science & Technology
·
2022
·Vol. 12
·期 9
·2865-2871
·
IF 6.177
Wenkai Ji,Zaixiang Xu,Shijie Zhang,Yang Li,Zhikang Bao,Zijiang Zhao,Liang Xie,Xing Zhong,Zhongzhe Wei,Jianguo Wang
Photocatalytic production of hydrogen peroxide (H2O2) has received great attention as a promising route for sustainable solar fuel. In this work, we demonstrate that quantum dots (QDs) can be explored as a useful photocatalyst for high-efficiency photocatalytic production of H2O2 under visible-light with a record-high concentration of 126 mmol L−1. By band structure and wavefunction engineering, QDs exhibit an enhanced stability in an oxidized and humid environment. An oil/water two-phase system is designed to realize spontaneous separation of the H2O2 formed to the aqueous phase and of the organic by-products formed to the oil phase. By electron paramagnetic resonance (EPR) measurements, ˙O2− radicals are generated from QDs in the oil phase and transferred to the water phase immediately. The results in this work show that QDs with a rational surface and structure design can serve as an outstanding photocatalyst for the production of H2O2 under visible-light.
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Nanoscale
·
2022
·Vol. 14
·期 31
·11210-11217
·
IF 8.307
Weijun Zhu,Zhuohan Lin,Xue Zhang,Wei Wang,Yan Li
Magic-size clusters (MSCs) are molecular materials with unique properties at the border between molecules and solids, providing important insights into the nanocrystal formation process. However, the synthesis of multicomponent alloy MSCs in a single-ensemble form remains challenging due to their tiny size and difficult doping control. Herein, for the first time, we successfully synthesized alloy ZnxCd13−xSe13 MSCs (x = 1–12) with a unique sharp absorption peak at 352 nm by cation exchange between Cd2+ ions and pre-synthesized (ZnSe)13 MSCs in a diamine solution at room temperature. The experimental results show that the use of diamines is crucial to the formation of stable ZnxCd13−xSe13 MSCs, which may be attributed to two amine groups that can coordinate to the surface of MSCs simultaneously. Limited by the robust interaction between diamine ligands and MSCs, the partial cation exchange results in the formation of alloy ZnxCd13−xSe13 MSCs. In contrast, complete cation exchange occurs in a monoamine solution, giving (CdSe)34 MSCs. Besides, a lower reaction temperature and a higher concentration of diamine favor the formation of ZnxCd13−xSe13 MSCs. Our study provides an important basis for further understanding of the transformation of MSCs and a new approach to the controllable synthesis of alloyed MSCs.
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