Science of Advanced Materials
·
2016
·Vol. 8
·期 8
·1617-1627
·
IF 1.812
Wen Zhen,Su Jun-Qing,Chen Qing,Chen Li-Di
To improve the physicochemical and pharmacokinetic properties, solid lipid nanoparticles (SLNs) modified with (Polyethylene glycol-2000)-1,2-distearoyl-sn-glycero-3-phosphoethanolamine (PEG2000-DSPE) were prepared using glyceryl monostearate as a lipid carrier and resveratrol as a model
drug. Compared to ordinary SLNs, SLNs doped with low amount of PEG2000-DSPE [m(PEG2000-DSPE):m(lipids) = 1:5, w/w] exhibited improved physicochemical and pharmacokinetic properties, including higher entrapment efficiency (above 80%), smaller particle size (approximately 100 nm), more
distinguished drug release at low pH values (pH < 6.0), and longer drug circulation in vivo. According to the characterizations performed, the DSPE moiety was doped into lipid matrix to form a PEG2000-DSPE/lipid eutectic dopant, inhibiting lipid polymorphism transformation
from α-form to β-form, thereby preventing drug expulsion from the lipid. The dopant contained lattice defects, allowing for the incorporation of more resveratrol. Resveratrol was released in a sustained and pH-sensitive pattern due to nanoparticles destabilization
induced by partial protonation of PEG2000-DSPE. PEG chains distributed on the nanoparticle surface caused steric hindrance and “stealth” properties, thus maintaining dispersion stability and extending circulation time of nanoparticles. These results confirm that PEG2000-DSPE modification
effects are attributable to the matrix and surface structures of nanoparticles, which consist of a core containing DSPEinduced lattice defects and a shell coated with PEG chains.
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ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Renming Zhan,Bolei Shen,Qiuju Xu,Youquan Zhang,Yushan Luo,Heng Liu,Hao Chen,Feng Liu,Changming Li,Maowen Xu
Pristine Na 3 Fe 0.5 V 1.5 (PO 4 ) 3 and carbon-coated Na 3 Fe 0.5 V 1.5 (PO 4 ) 3 nano-particles are synthesized by one-step solid-phase reaction method. The full battery based on Na 3 Fe 0.5 V 1.5 (PO 4 ) 3 @C nano-particles as cathode and commercial hard carbon as anode outputs a high working voltage about 3.3 V and exhibits superior-rate performance. While the rate increases from 0.5 to 1, 2 and 5 C, the discharge capacity of full battery slightly decreases from 110 to 94, 88, 79 mA h g −1 gradually. Moreover, it shows excellent cycle stability with a capacity retention of 93.8% after 200 cycles at 0.5 C.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
Zhaohong Su,Daili Tang,Junjie Liu,Xiaolan Yang,Siyu Xu,Wenjing Xu,Yuqing Zhou,Mingyang Xu,Jianlong Yi,Hongmei Jiang,Yuanhua Shao,Xiaoli Qin
A simple and rapid electrochemical synthesis strategy for in-situ fabrication of toluidine blue (TB)-functionalized metal organic framework (TB@MOFs) thin films via one-step reduction approach was reported. The TB@MOFs thin layer has been synthesized on the working electrode surface in different times at room temperature , and its morphology and thickness was characterized by varied instruments, including scanning electron microscope, transmission electron microscope, and scanning ion conductance microscope. The prepared TB@MOFs shows exceptional electrochemical activity and stability under mild conditions, and its electrochemical response is dependent on the amount of TB molecules which are encapsulated in the MOFs. Based on the TB@MOFs sensing platform, a sensitive label-free electrochemical immunosensor for the detection of Indole-3-acetic acid (IAA, a plant hormone) was developed with a wide linear range (2.5 pg mL −1 - 5 ng mL −1 ) and a low detection limit (1.4 pg mL −1 ). Moreover, this immune sensor shows good sensitivity and selectivity in real samples for IAA detection.
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Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 15
·9581-9585
·
IF 12.732
Yuemin Du,Yijie Liu,Sixie Yang,Chao Li,Zhu Cheng,Feilong Qiu,Ping He,Haoshen Zhou
The fossil fuel crisis and global warming are becoming more and more severe in this century, while the exploration of human survival on Mars is being pushed forward steadily. Hence, it is meaningful to effectively utilize CO2, the main greenhouse gas and a major component of the Martian atmosphere. Due to their high capacity and ability to capture CO2, Li–CO2 batteries have received much attention. However, there are problems that still need to be solved relating to Li–CO2 batteries, including the instability of the electrolyte and the non-negligible polarization caused by the formation and decomposition of Li2CO3. To address these issues, an all-solid-state Li–CO2 battery, which uses RuO2 nanoparticles combined with single-walled carbon nanotubes (SWCNTs) as the cathode material and a sodium super ionic conductor (NASICON)-type ceramic solid electrolyte, Li1.5Al0.5Ge1.5(PO4)3 (LAGP), has been developed and it operates over a broad temperature range. Under a pure CO2 atmosphere, this well-designed battery shows a discharge capacity of 2499 mA h g−1 and a charge capacity of 2137 mA h g−1 in the first cycle at 60 °C, and stable cycling performance over 30 cycles under a capacity limitation of 500 mA h g−1 at a current density of 50 mA g−1. This result enhances the possibility of the utilization of the Li–CO2 battery in the future.
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Nanomaterials
·
2021
·Vol. 11
·期 11
·3122
·
IF 5.076
Rao Fu,Yinyan Gong,Can Li,Lengyuan Niu,Xinjuan Liu
The development of highly active and stable photocatalysts, an effective way to remediate environment pollution and alleviate energy shortages, remains a challenging issue. In this work, a CdIn2S4/In(OH)3nanocomposite was deposited in-situ on NiCr-LDH nanosheets by a simple hydrothermal method, and the obtained CdIn2S4/In(OH)3/NiCr-LDH heterostructure photocatalysts with multiple intimate-contact interfaces exhibited better photocatalytic activity. The photocatalytic H2evolution rate of CdIn2S4/In(OH)3/NiCr-LDH increased to 10.9 and 58.7 times that of the counterparts CdIn2S4and NiCr-LDH, respectively. Moreover, the photocatalytic removal efficiency of Cr(VI) increased from 6% for NiCr-LDH and 75% for CdIn2S4to 97% for CdIn2S4/In(OH)3/NiCr-LDH. The enhanced photocatalytic performance was attributed to the formation of multi-interfaces with strong interfacial interactions and staggered band alignments, which offered multiple pathways for carrier migration, thus promoting the separation efficiency of photo-excited electrons and holes. This study demonstrates a facile method to fabricate inexpensive and efficient heterostructure photocatalysts for solving environmental problems.
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CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Zhixiang Cai,Hongbin Zhang
The chain conformational change in curdlan during carboxymethylation was investigated using nuclear magnetic resonance (NMR), circular dichroism (CD) spectroscopy, and atomic force microscopy (AFM). The distributions of carboxymethyl substituents within anhydroglucose unit (AGU) of CMCD were found to follow the order of OH (6) > OH (4) > OH (2) for CMCD with a low DS and OH (6) > OH (2) > OH (4) for CMCD with relatively high DS. The increased carboxymethylation level induced the chain conformation transition of curdlan from triple helix to random coil in water. The DS of 0.25 was the critical value of chain conformation transition, below which CMCD chains were triple helices. For DS larger than 0.25, CMCD existed in the state of random coils. The intermolecular hydrogen bonding between C2 hydroxyls in AGU sustained the triple helical conformation and stiffness of the polymer chain, which weakened with the increase in DS.
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PubMed
高影响因子
Materials
·
2020
·Vol. 13
·期 7
·1719
·
IF 3.057
Qinghui Li,Chang Xu,Bing Huang,Xin Yin
NASICON-type solid electrolytes with excellent stability in moisture are promising in all-solid-state batteries and redox flow batteries. However, NASIOCN LiZr2(PO4)3(LZP), which is more stable with lithium metal than the commercial Li1.3Al0.3Ti1.7(PO4)3, exhibits a low Li-ion conductivity of 10−6S cm−1because the fast conducting rhombohedral phase only exists above 50 °C. In this paper, the high-ionic conductive rhombohedral phase is stabilized by Y3+doping at room temperature, and the hot-pressing technique is employed to further improve the density of the pellet. The dense Li1.1Y0.1Zr1.9(PO4)3pellet prepared by hot-pressing shows a high Li-ion conductivity of 9 × 10−5S cm−1, which is two orders of magnitude higher than that of LiZr2(PO4)3. The in-situ formed Li3P layer on the surface of Li1.1Y0.1Zr1.9(PO4)3after contact with the lithium metal increases the wettability of the pellet by the metallic lithium anode. Moreover, the Li1.1Y0.1Zr1.9(PO4)3pellet shows a relatively small interfacial resistance in symmetric Li/Li and all-solid-state Li-metal cells, providing these cells a small overpotential and a long cycling life.Keywords:NASICON;hot pressing;interfacial resistance;Li-ion conductivity;all-solid-state batteries
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PubMed
高影响因子
AIP Advances
·
2017
·Vol. 7
·期 10
·
IF 1.568
Luo Jiangqi,Fu Qiong,Wang Haiyun,Zhao Dongmei,Luo Laihui,Li Weiping
In order to seek for the single-phase multiferroic metal-organic frameworks (MOFs) materials, we prepared a multiferroic material [NH 2 -CH + -NH 2 ]Co(HCOO) 3 (FMDCo) by solvothermal method. We found that it had weak ferromagnetism below 12.5 K with the coercive fields ( H c ) of 560 Oe, remnant magnetization ( M r ) of 7.67 emu/g and saturation magnetization ( M s ) of 10.3 emu/g and exhibited obvious dielectric relaxation. The octahedral metal ions (Co 2+ ) were linked by formate (HCOO - ) ligands. The AmineH + cation (NH 2 -CH + -NH 2 ) were located within the cube-like cavities of the framework and formed extensive hydrogen bonds with the framework. This improved the phase transition temperature and thermal stability. This finding helps to understand the nature of magnetic and electric ordering in the MOFs.
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APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Qian Zhang,Xiang-Dong Wang,Ting Tian,Li-Qiang Chu
Surface-enhanced Raman scattering (SERS) sensors have been extensively studied for ultrasensitive detection of diverse chemical or biological analytes. Facile fabrication of highly sensitive SERS substrates is believed to be of crucial importance in these analytical applications. In this regard, the preparation of 3-dimensional (3D) SERS substrates are explored via the incorporation of multilayered silver nanoparticles (AgNPs) into poly (oligo(ethylene glycol) methacrylate) (POEGMA) brushes by repeating the immersion-rinsing-drying steps for different lengths of time (i.e., the so-called in-stacking method). The POEGMA brushes of different chain lengths are synthesized by surface-initiated atom transfer radical polymerization (ATRP) with various reaction time. The resulting POEGMA/AgNP nanocomposites are characterized by FE-SEM, UV–vis and Raman spectroscopy. FE-SEM and UV–vis results indicate that the AgNPs are successfully incorporated into the POEGMA brushes with a 3D configuration. The nanocomposite films are employed as SERS substrates for the detection of a Raman reporter molecule (i.e., 4-aminothiophenol), giving rise to an enhancement factor of up to 1.29 × 10 7 and also having relatively good uniformity and reproducibility. The obtained 3D SERS substrates are also used for the detection of a typical gram-positive bacterium, Staphylococcus aureus . The limit of detection is found to be as low as ca. 8 CFU/mL.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2020
·Vol. 34
·期 8
·e5707
·
IF 3.14
Laiyun Zhou,Mingliang Wang,Kaixuan Wang,Tiantian Wen,Lanzhi Wang
Fe 3 O 4 @SiO 2 -CeCl 3 catalyzed chemoselective synthesis of functionalized 3-substituted-1,5-benzodiazepines via one-pot multicomponent and domino reactions has been developed. During the one-pot synthesis process, one new cycle and four new bonds (one C–C, two C–N and one C=C) were constructed by the nucleophilic addition and eliminate reaction (dehydration etc.) process, intramolecular proton transfer and cyclization process. The major advantages of the present method are good to excellent yields, shorter reaction time, simple experimental procedure, easy work up, mild reaction conditions, recyclability of the catalyst and ability to tolerate a variety of functional groups which gives economical as well as ecological rewards.
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Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 12
·7817-7825
·
IF 12.732
Shanshan Duan,Can Huang,Min Liu,Zhiwen Cao,Xiaocong Tian,Shuen Hou,Jiangyu Li,Boyuan Huang,Hongyun Jin
NASICON-type solid state electrolytes have attracted great interest in all-solid-state batteries, and many attempts have been applied to enhance the ionic conductivity. It is generally believed that low activation energy governs the high ionic conductivity while the prefactor, particularly migration entropy, is often overlooked. Here, employing a combination of electrochemical strain microscopy, speed of sound measurements, and electrochemical impedance spectra, we investigate the structure–property relationships governing ionic conduction behavior in the Li1−3xGaxZr2(PO4)3 system. A sharp increase in the prefactor upon Ga substitution is attributed to the increased migration entropy while the increase in activation energy can be rationalized in terms of the inductive effect. These two competitive factors determine the final ionic conductivity.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 23
·1-13
·
IF 2.8
Xu Cheng,Liu Ke,Lu Yong,Xu Qi
Sodium-ion batteries (SIBs), as an emerging energy storage technology, have been recognized as one of the most promising alternatives to lithium-ion batteries (LIBs). Among various cathode materials, the NASICON-type Na 4 VMn(PO 4 ) 3 (NVMP) composite material has garnered considerable attention owing to its distinctive 3D framework structure, high redox potential, stable crystal structure, and rapid Na + diffusion rate. Nevertheless, the practical application of NVMP cathodes is constrained by several inherent limitations, including inherently low electronic conductivity, Mn 3+ Jahn–Teller distortion, and structural degradation mechanisms, which collectively contribute to compromised rate capability and limited cycling durability. To tackle this challenge, an N-doped dual nano-carbon coating was applied to the NVMP material to enhance the conductivity of the composite. Building upon this foundation, a series of Na 4 VMn 1- x Cr x (PO 4 ) 3 /NC@CNTs cathode materials (where x = 0, 0.25, 0.5, 0.75, and 1) were successfully prepared using the sol–gel method, enabling targeted regulation of Mn/Cr ratios for enhanced electrochemical performance. The N-doped dual nano-carbon coating is capable of forming carbon layer defects and active sites, as well as constructing a 3D conductive network structure, which can enhance the diffusion rate of Na + ions and shorten their transport path. The results indicate that the Na 4 VMn 0.5 Cr 0.5 (PO 4 ) 3 /NC@CNTs cathode material demonstrates the highest discharge capacity, achieving 132.1 mAh·g −1 when x = 0.5. Notably, the capacity decreases rapidly at high rates, potentially attributed to the collapse of the crystal structure and excessive polarization, resulting in a deterioration of the material’s electrochemical performance. The optimized Na 4 VCr(PO 4 ) 3 /NC@CNTs (when x = 1) demonstrates exceptional rate performance with 91.2% capacity retention at 1C, accompanied by significantly reduced charge transfer resistance (Rct = 331.9 Ω). This study establishes a design paradigm for NASICON-type cathode materials through dual-transition metal synergistic doping and demonstrates the efficacy of Cr/Mn co-substitution in balancing ionic/electronic conductivity for next-generation high-power sodium-ion batteries.
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