MATERIALS RESEARCH BULLETIN
·
2021
·
IF 4.641
Fei Qu,QianQian Fa,Tian Yin,Dafeng Jiang,Xian-en Zhao
A new kind of lead halide perovskites (LHPs) with aggregation induced emission (AIE) feature is developed. These LHPs are nonemissive when they disperse in good solvent (DMF), but show high brightness when they aggregate in water. The morphology of LHPs changes from nanometer-sized irregular shape to micrometer-sized needle-like, and then to stick-like with increasing water fraction. However, their AIE is quenched by only a few pM of dispersed gold nanoparticles (AuNPs). Dopamine (DA) induces aggregation of AuNPs, resulting in AIE recovery of LHPs. A good linear range of DA is obtained from 0.5 to 50 μM with the limit of detection (LOD) 0.12 μM. In the catalysis of tyrosinase (TYR), DA is oxidized to dopaquinone, resulting in the fluorescence quenching of LHPs again. Therefore, this system is further used for monitoring TYR activity and evaluating inhibitor of TYR. Finally, this method is successfully applied to detecting DA in urine samples.
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高影响因子
MOLECULES
·
2021
·Vol. 26
·期 19
·5821
·
IF 4.412
Xiuqiong Chen,Qingmei Zhu,Zhengyue Li,Huiqiong Yan,Qiang Lin
On account of the rigid structure of alginate chains, the oxidation-reductive amination reaction was performed to synthesize the reductive amination of oxidized alginate derivative (RAOA) that was systematically characterized for the development of pharmaceutical formulations. The molecular structure and self-assembly behavior of the resultant RAOA was evaluated by an FT-IR spectrometer, a1H NMR spectrometer, X-ray diffraction (XRD), thermal gravimetric analysis (TGA), a fluorescence spectrophotometer, rheology, a transmission electron microscope (TEM) and dynamic light scattering (DLS). In addition, the loading and in vitro release of ibuprofen for the RAOA microcapsules prepared by the high-speed shearing method, and the cytotoxicity of the RAOA microcapsules against the murine macrophage RAW264.7 cell were also studied. The experimental results indicated that the hydrophobic octylamine was successfully grafted onto the alginate backbone through the oxidation-reductive amination reaction, which destroyed the intramolecular hydrogen bond of the raw sodium alginate (SA), thereby enhancing its molecular flexibility to achieve the self-assembly performance of RAOA. Consequently, the synthesized RAOA displayed good amphiphilic properties with a critical aggregation concentration (CAC) of 0.43 g/L in NaCl solution, which was significantly lower than that of SA, and formed regular self-assembled micelles with an average hydrodynamic diameter of 277 nm (PDI = 0.19) and a zeta potential of about −69.8 mV. Meanwhile, the drug-loaded RAOA microcapsules had a relatively high encapsulation efficiency (EE) of 87.6 % and good sustained-release properties in comparison to the drug-loaded SA aggregates, indicating the good affinity of RAOA to hydrophobic ibuprofen. The swelling and degradation of RAOA microcapsules and the diffusion of the loaded drug jointly controlled the release rate of ibuprofen. Moreover, it also displayed low cytotoxicity against the RAW264.7 cell, similar to the SA aggregates. In view of the excellent advantages of RAOA, it is expected to become the ideal candidate for hydrophobic drug delivery in the biomedical field.Keywords:reductive amination of oxidized alginate derivative;systematic characterization;molecular structure;self-assembly behavior;hydrophobic drug delivery
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yi Hao,Yuan Gao,Luyao Gao,Yulian He,Yingying Niu,Sameer Hussain,Ruixia Gao,Lisa D. Pfefferle,M. Shahid,Sicen Wang
A new class of amphiphilic magnetic adsorbents (denoted as Fe 3 O 4 -GPS-A) is fabricated by functionalization of the Fe 3 O 4 surface with six different amphiphilic silanizing agents that are specifically tailor-made to the chemical structure of PAEs. The resulting Fe 3 O 4 -GPS-A exhibit different contact angles due to the significant changes in functional groups, as revealed by 1 H NMR and FTIR spectroscopy. Among six Fe 3 O 4 -GPS-A, Fe 3 O 4 -DOA and Fe 3 O 4 -OAN exhibit a fast adsorption process (within 60 min) and high adsorption capacity for dibutyl phthalate (DBP) and dioctyl phthalate (DOP), two commonly used phthalate esters (173.7 mg g −1 for DOP and 104.4 mg g −1 for DBP), in conjunction with fast magnetic responsiveness and good thermal stability. The adsorption performance of Fe 3 O 4 -DOA and Fe 3 O 4 -OAN were well-maintained even after ten cycles. Besides, the adsorption mechanism was investigated through adsorption fitting models and theoretical calculations, which inferred that the interactions between adsorbent and adsorbate are mainly based on hydrophobic interactions along with secondary non-covalent contacts. Finally, the adsorbents combined with GC–MS analyses were applied to monitor DBP and DOP in the lake water samples. This work not only opens up a strategy for amphiphilic modification of magnetic adsorbents, but also provides a new avenue in their application for phthalate esters detection.
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CHEMISTRY OF MATERIALS
·
2021
·
IF 9.811
Lin Huang,Zikang Ye,Lei Yang,Jiongzhao Li,Haiyan Qin,Xiaogang Peng
Localization of exciton wavefunctions away from the inorganic–organic interface is proposed for synthesizing colloidal spheroidal quantum dots (QDs) with an ultranarrow photoluminescence (PL) peak width. This strategy is demonstrated by synthesizing uniform-alloy CdxZn1–xSe and CdxZn1–xSe/ZnSe/ZnS core/shell QDs. For blue-emitting QDs, the ensemble PL full width at half-maximum (fwhm) reaches 10.2 nm and the corresponding single-dot PL fwhm is 5.2 nm. The ensemble and single-dot PL fwhm values for green-emitting QDs are 16.3 and 9.7 nm, respectively. These record-low PL fwhm values for spheroidal QDs are close to the requirements for ideal displays. To control the composition homogeneity, the synthetic scheme is separated into four consecutive steps, namely, nucleation of monodisperse CdSe core QDs, epitaxial growth of thickness-controlled CdSe/ZnSe core/shell QDs with a low degree of spontaneous alloying, Cu-catalyzed alloying for uniform-alloy QDs, and additional epitaxy of outer ZnSe and ZnS shells onto uniform-alloy CdxZn1–xSe QDs. Among all metal ions tested, copper ions are identified to be the best catalysts for forming uniform-alloy CdxZn1–xSe QDs, which can enter a QD rapidly to initiate alloying and effectively exit a QD after the alloying process under the experimentally feasible conditions.
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Advanced Optical Materials
·
2021
·Vol. 9
·期 16
·2100474
·
IF 9.926
Dong Huang,Jun Bo,Ronghong Zheng,Chengzhao Luo,Xiaojuan Sun,Qinyi Li,Dongyang Shen,Zhishuai Zheng,Mengyu Chen,Yixing Yang,Aiwei Tang,Song Chen,Yu Chen
All-inorganic perovskite quantum dots (QDs) have emerged as a new category of low-cost semiconducting luminescent materials for optoelectronic applications. However, their poor stability has become the main challenge that impedes their potential applications. Herein, Ni-doped CsPbBr 3 QDs with lead phosphate (Pb 3 (PO 4 ) 2 ) shell through surface sacrificial coating (c-Ni-CsPbBr 3 ) have been developed based on a modified thermal injection approach. The synergistic effect of Ni doping and Pb 3 (PO 4 ) 2 coating effectively improves the stability and optical performances of CsPbBr 3 QDs, including photoluminescence (PL) intensity, the average lifetime, and PL quantum yield (QY). Thus, the c-Ni-CsPbBr 3 QDs demonstrate the full width at half maxima (FWHM) and PLQY being 18.42 nm and 90.77%, respectively. The PL intensity of c-Ni-CsPbBr 3 can be maintained at 81% of its original value after being heated at 100 °C for 1 h. No phase transformation can be observed after being stored under ambient conditions (25 °C, 60% relative humidity (RH)) for 21 days. In addition, by combining green c-Ni-CsPbBr 3 QDs, red CdSe-based QDs and the blue GaN chip, a QD enhancement film (QDEF) is fabricated to form a liquid crystal display (LCD) backlit with a wide color gamut covering cover 121% of the National Television System Committee (NTSC) standard.
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Materials Advances
·
2021
·Vol. 2
·期 4
·1320-1327
·
IF 0
Yao Liu,Aifei Wang,Jiajing Wu,Chuying Wang,Ziliang Li,Guangcai Hu,Shiqi Sui,Jia-Xin She,Wen Meng,Weiqiang Li,Zhengtao Deng
In recent years, two-dimensional (2D) layered tin halide perovskites have attracted much attention due to their excellent luminescence properties compared with their three-dimensional (3D) analogs. Here, we synthesized 2D perovskites of the form (RNH3)2SnBr4 through a facile hot-injection approach without the use of toxic tri-n-octylphosphine (TOP) as the solvent. We found that these compounds have strong photoluminescence (PL) emission with high PL quantum yields (QY) of 35% ((C6H13NH3)2SnBr4), 82% ((C8H17NH3)2SnBr4), 60% ((C12H25NH3)2SnBr4) and 50% ((C18H35NH3)2SnBr4). Among them, ((C6H13NH3)2SnBr4) was synthesized for the first time; however, (C18H36NH3)2SnBr4 perovskites showed the best stability with a PL QY decrease of less than 1% after 30 days under ambient air and humidity conditions. In addition, other 2D (C8H17NH3)2SnX4 (X = Br, I, or mixture) perovskites were prepared by adjusting the halide ratio, resulting in spectral tunability from yellow to red. Interestingly, through Zn2+ doping, the morphology became more uniform, and the PL stability was significantly improved. Finally, we used Zn2+-doped (C8H17NH3)2SnBr4 yellow phosphor to fabricate UV-pumped yellow LEDs. We expect these 2D perovskites to be promising phosphors in future solid-state lighting and display technologies.
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Nanomaterials and Nanotechnology
·
2020
·
IF 2
Shuhong Xu,Guangguang Huang,Chunlei Wang,Haibao Shao,Yiping Cui
In this work, we improved the photocurrent of self-powered ultraviolet photodetector via doping manganese in CsPbCl3 perovskite nanocrystals light harvester. The doped manganese in nanocrystals has the following three features to assist electron transfer from CsPbCl3 nanocrystals to titanium dioxide: (i) the fast exciton-to-manganese energy transfer process benefits for competing electrons with perovskite exciton recombination, (ii) the charge carrier lifetime is very long for manganese d-states due to its spin and orbital forbidden transition, and (iii) the electrons can effectively transfer to the titanium dioxide layer from 4T1 of manganese d-states due to the smaller energy barrier. Based on the above, the self-powered photocurrent density of photodetectors has nearly twice enhancement from 0.08 mA·cm−2 to 0.14 mA·cm−2 and a high responsivity up to 7.3 mA·W−1 was achieved at 340 nm.
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高影响因子
BIOMACROMOLECULES
·
2020
·
IF 6.092
Zhiwei Wang,Min Lin,Colin Bonduelle,Rongye Li,Zhekun Shi,Chenhui Zhu,Sébastien Lecommandoux,Zhibo Li,Jing Sun
Delicate control over architectures via crystallization-driven self-assembly (CDSA) in aqueous solution, particularly combined with external stimuli, is rare and challenging. Here, we report a stepwise CDSA process thermally initiated from amphiphilic poly(N-allylglycine)-b-poly(N-octylglycine) (PNAG-b-PNOG) conjugated with thiol-terminated triethylene glycol monomethyl ethers ((PNAG-g-EG3)-b-PNOG) in aqueous solution. The diblock copolymers show a reversible thermoresponsive behavior with nearly identical cloud points in both heating and cooling runs. In contrast, the morphology transition of the assemblies is irreversible upon a heating–cooling cycle because of the presence of a confined domain arising from crystalline PNOG, which allows for the achievement of different nanostructured assemblies by the same polymer. We demonstrated that the thermoresponsive property of PNAG-g-EG3 initiates assembly kinetically that is subsequently promoted by crystallization of PNOG thermodynamically. The irreversible morphology transition behavior provides a convenient platform for comparing the cellular uptake efficiency of nanostructured assemblies with various morphologies that are otherwise similar.
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高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 45
·16083-16091
·
IF 7.059
Wenzhen Lv,Mingchuan Xu,Lei Ge,Xun Zhu,Junxian Hong,Wei Huang,Runfeng Chen
In recent years, substantial progress has been made in the synthesis of colloidal CsPbX3 (X = Cl, Br, and I) nanocrystals (NCs). However, the anion exchange reaction always synthesizes CsPbCl3 NCs with low efficiency and poor stability. Here, first, through separating the halide precursors, mainly metal halide salts as CdCl2 in water, we propose a two-phase anion exchange method, successfully preparing CsPbCl3 NCs with a well-maintained cubic morphology and high photoluminescence quantum yields of about 95%. A controllable Cl-to-Br exchange rate is readily achieved by controlling the reaction time or the Cl− ion concentration. Benefiting from the good solubility of CdCl2 in water, Cl− ions are provided continuously, guaranteeing an adequate Cl-to-Br exchange at a high concentration of the original substrate. Rich Cl− ions, water and even the Cd2+ ions perform effective passivation of the nonradiative recombination centers likely stemming from Cl vacancies or other impurities, which has been confirmed by the transient optical spectroscopy measurements and elemental characterization. Also, the CsPbCl3 NCs reveal improved air stability and excellent photostability. We believe that the two-phase anion exchange method offers a new way to obtain high-efficiency CsPbCl3 NCs through a postsynthetic chemical transformation route, and helps to promote further corresponding applications in optoelectronic devices.
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NANOTECHNOLOGY
·
2020
·Vol. 31
·期 50
·505402
·
IF 3.551
Hao Ying,Chenyun Zhang,Tingting Chen,Xiaoning Zhao,Zhonghao Li,Jingcheng Hao
The electrochemical hydrogen evolution reaction (HER) is a promising strategy for production of hydrogen; however, it is still restricted by appropriate efficient and low-cost electrocatalysts. Herein, for the first time, the n-octylammonium hypophosphite, a kind of protic ionic liquid (IL), was used as a new phosphorus source for the manufacture of nickel metaphosphate (Ni2P4O12) electrocatalysts. In contrast to traditional multi-step fabrication processes, the n-octylammonium hypophosphite acted as both reactant and solvent to synthesize Ni2P4O12 by a one-step calcination approach. The obtained Ni2P4O12 as an alkaline HER catalyst required a low overpotential of 116 mV at −10 mA cm−2 and a small Tafel slope of 97 mV dec−1, comparable to the majority of reported Ni-based materials and other phosphate catalysts. Furthermore, this catalyst exhibited robust stability with no distinct attenuation of current density after a long-term durability test in 1 M KOH. Therefore, this task-specific IL strategy with a simple reaction system, reducing the occurrence of side reactions, provided a new perspective on design of high-efficiency metaphosphate electrocatalysts.
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BIOORGANIC CHEMISTRY
·
2020
·
IF 4.831
Huan Li,Shuang Fu,Yudan Wang,Xuan Yuan,Lijia Liu,Hongxing Dong,Qiang Wang,Zhijia Zhang
Thirteen cationic peptidomimetics derived from amino acids bearing an alkyl or ethynylphenyl moiety that mimic the structure of cationic antibacterial peptides were designed and synthesized using a simple coupling reaction of an amino acid with a substituted amine. Antibacterial activities of the resulting peptidomimetics against drug-sensitive bacteria, such as Gram-positive Staphylococcus aureus ( S. aureus ) and Bacillus subtilis , Gram-negative Escherichia coli ( E. coli ) and Salmonella enterica , and a drug-resistant bacterium, methicillin-resistant S. aureus (MRSA), were systematically evaluated. Most peptidomimetics show significant broad-spectrum antibacterial activity. A-L-Iso-C 12 (isoleucine derivative bearing a dodecyl moiety) show MICs of 2.5 μg/mL against S. aureus and 4 μg/mL against MRSA and A-L-Val-C 12 (valine derivative bearing a dodecyl moiety) show MICs of 1.67 μg/mL against E. coli and 8.3 μg/mL against MRSA. A-L-Val-C 12 showed low cytotoxicity toward L929 cells in comparison with SGC 7901 cells, indicating tumor-directed killing by peptidomimetics while avoiding toxicity to normal cells. The influences of type of amino acid and substituent, length of substituent, and stereochemistry of amino acids on antibacterial activity and cytotoxicity of peptidomimetics were systematically investigated. The results indicate that this series of cationic peptidomimetics derived from amino acids display antitumor activity and may be useful for treatment of bacterial infections.
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高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2021
·Vol. 54
·期 11
·115504
·
IF 3.207
Xi-Kai Yang,Jia-Wei Qiao,Zhi-Hao Chen,Zhen-Chuan Wen,Hang Yin,Xiao-Tao Hao
We adopt inorganic semiconducting CdSe quantum dots (QDs) as a third component in the PTB7-Th:PC71BM-based organic solar cells due to their advantages of strong absorbance, high conductivity, and good solution processability. With the blending of low-dosage CdSe QDs, the short-circuit current density (Jsc) and power conversion efficiencies can be improved by 13% and 11%, respectively, in the ternary device. Compared with the control device, CdSe QDs can effectively modulate the charge dynamics and lead to enhanced fluorescence external quantum efficiency. Moreover, effective Förster resonance energy transfer and fast charge transfer can be observed in the CdSe QD-based bulk-heterojunction (BHJ) films, and therefore improve the overall performance of the organic photovoltaic devices. This work provides an effective method by adopting CdSe QDs to fabricate high-performance PTB7-Th:PC71BM BHJ solar cells.
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