CATALYSIS SURVEYS FROM ASIA
·
2021
·Vol. 26
·期 1
·35-45
·
IF 3.106
Shan Shufeng,Tian Yiting,Chen Feifei,Wu Shikui,Zhou Rujin,Xie Ying,Li Ning,Zeng Xingye,Lin Cunhui,Yu Wei
NiMoS supported on ZSM-5 with different Si/Al ratio, crystallite size and pore structure was prepared by incipient impregnation method and applied in 1, 3, 5-trimethylbenzene (1, 3, 5-TMB) hydrodealkylation (HDAK). The physicochemical properties of samples were characterized by XRD, FTIR, SEM, N 2 adsorption–desorption, NH 3 -TPD, Py-FTIR, H 2 -TPR, HRTEM and TGA. It is demonstrated that for microporous NiMoS/ZSM-5, acid amount and crystallite size of HZSM-5 are key factors affecting HDAK performance. The larger acid amount and smaller crystallite size can promote the conversion of 1, 3, 5-TMB, especially the dealkylation reaction, resulting in higher BTX yield. Compared to NiMoZ-3, mesopores in micro-mesoporous NiMoAKZ-3 are beneficial to accessibility of 1, 3, 5-TMB to NiMoS and acid sites in close proximity, and the diffusion of reactant and product molecules inside pores, thus resulting in superior HDAK performance of NiMoAKZ-3. Moreover, the reaction network of 1, 3, 5-TMB HDAK was revealed according to product distribution. Graphic Abstract NiMoS supported on ZSM-5 was developed for heavy aromatic hydrodealkylation (HDAK). Acid amount and crystallite size of microporous ZSM-5 are key factors affecting 1,3,5-trimethylbenzene (1,3,5-TMB) HDAK. Mesopores inside ZSM-5 facilitate accessibility of 1,3,5-TMB to NiMoS and acid sites in close proximity and improve HDAK performance.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 8
·9795-9803
·
IF 2.478
Wei Song,Miao Juhong,Shi Qiuwei,Shao Shaofeng,Zhang Lei
In order to obtain improvement in efficiency and stability of quantum dot light-emitting diodes (QLEDs), it is essential to seek carrier transport layer with higher carrier transport efficiency and better air stability. In terms of the high-performance carrier transport layer, solution-processed inorganic metal oxides show promise for efficient QLEDs because of their suitable energy band, high carrier mobility, especially their outstanding air stability. In this study, we employed high-quality oleic acid-capped TiO 2 nanocrystals as the electron transportation layer to fabricate air-stable inverted QLEDs. These TiO 2 nanocrystals have narrow size distribution, outstanding crystalline property, especially excellent air stability. To improve the interfacial carrier transportation performance of oleic acid-capped TiO 2 nanocrystals, we introduce a thionyl chloride (SOCl 2 ) post-ligand exchange process that replaces organic long-chain ligands with single inorganic ligands efficiently. The stability of oleic acid-capped TiO 2 -based QLEDs were evaluated by comparing with the traditional ZnO-based QLEDs. As a result, oleic acid-capped TiO 2 nanoparticles show excellent long-term air stability. This study offers an alternative strategy to deal with the stability issue of optoelectronic devices.
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Nature Communications
·
2021
·Vol. 12
·期 1
·1-9
·
IF 14.919
Wu Jingjun,Guo Jing,Linghu Changhong,Lu Yahui,Song Jizhou,Xie Tao,Zhao Qian
The low productivity of typical 3D printing is a major hurdle for its utilization in large-scale manufacturing. Innovative techniques have been developed to break the limitation of printing speed, however, sophisticated facilities or costly consumables are required, which still substantially restricts the economic efficiency. Here we report that a common stereolithographic 3D printing facility can achieve a very high printing speed (400 mm/h) using a green and inexpensive hydrogel as a separation interface against the cured part. In sharp contrast to other techniques, the unique separation mechanism relies on the large recoverable deformation along the thickness direction of the hydrogel interface during the layer-wise printing. The hydrogel needs to be extraordinarily soft and unusually thick to remarkably reduce the adhesion force which is a key factor for achieving rapid 3D printing. This technique shows excellent printing stability even for fabricating large continuous solid structures, which is extremely challenging for other rapid 3D printing techniques. The printing process is highly robust for fabricating diversified materials with various functions. With the advantages mentioned above, the presented technique is believed to make a large impact on large-scale manufacturing.
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JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2019
·Vol. 28
·期 2
·647-656
·
IF 2.765
Feng Libang,Bian Yaohui,Chai Changsheng,Qiang Xiaohu
Given its thermal reversibility, high yield, and minimal side reactions, the Diels–Alder (DA) reaction is a particularly desirable technique for the preparation of polymeric materials with heat-stimulated self-healing properties. A linear self-healing polyurethane containing thermally reversible DA bonds (PU-DA) was developed in this study. Results revealed that the introduction of DA bonds conferred outstanding mechanical property and thermal reversibility to PU-DA films. Thus, the as-prepared PU-DA films demonstrated excellent self-healing performance. The self-healing behavior of the PU-DA films under various heat treatments was examined through qualitative observation and quantitative measurements. The PU-DA underwent self-repair through the combination of two healing actions, i.e., the thermal movement of molecular chains and the thermally reversible DA reaction. Moreover, the self-healing behavior of the PU-DA was repeatable, and the PU-DA continued to present high strength even after undergoing three damage–repair cycles at the same site. In addition, the as-prepared PU-DA exhibited excellent macro-scale self-healing behavior, and it endowed the PU-DA presented reprocessing performance. The PU-DA can be recycled given its excellent self-healing and outstanding reprocessing performances.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2022
·Vol. 38
·期 6
·1532-1541
·
IF 2.726
Zhang Tianran,Yu Huacheng,Wang Wenkai,Bai Pu,Jin Keyan,Zhang Jia-Nan,Yan Wenfu
It is highly desired yet challenged to find an adsorbent with low cost and excellent performance in the removal of organic dyes from aqueous solution. Here we reported that a layered cationic aluminum oxyhydroxide material hydrothermally synthesized from the low-cost source materials of AlCl 3 ·6H 2 O, CaO and H 2 O, known as JU-111, can meet such criterion in removing methyl orange(MO) and Congo red(CR). JU-111 shows fast adsorption kinetics[especially for CR(15 s)] and high adsorption capacity(MO: >1000 mg/g; CR: >2900 mg/g), surpassing most of the reported adsorbents. Comprehensive characterizations of the adsorption process of MO and CR revealed that both adsorptions were achieved via the anion exchange process. The characteristics of extremely low cost and excellent performance render JU-111 great potential in the practical applications in the removal of anionic dyes.
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Revista Brasileira de Farmacognosia-Brazilian Journal of Pharmacognosy
·
2024
·
IF 1.4
Xie Huilong,Fu Yunrong,Lin Zhisheng,Wang Jiayi,Wu Jingyu,You Xiuhua,Xie Jieming
This study explores the synergistic effect of T-CUS 245C combined with cyclosporin A, and its possible mechanism. T-CUS 245C is an immunotoxin conjugated with tastuzumab and recombinant cucurmosin 245C (CUS 245C ). Cyclosporin A is a calcium antagonist mainly used as an immune-suppressive agent, which enhances the cytotoxicity of immunotoxins through an unknown mechanism. The sulforhodamine B assay, flow cytometry, DNA fragmentation apoptosis assay, and western blot analysis were used to evaluate the synergistic effects of cyclosporin A combined with T-CUS 245C on proliferation inhibition and apoptosis induction in SK-OV-3 ovarian cancer cells with HER-2-overexpressing. Meanwhile, using confocal microscopy and flow cytometry, the effect of cyclosporin A on the intracellular distribution of T-CUS 245C was observed and quantified. The results of this study showed that the combination index of cyclosporin A combined with T-CUS 245C is less than 0.7, indicating that cyclosporin A significantly enhances the proliferation inhibition and apoptosis induction induced by T-CUS 245C in SK-OV-3 cells. The confocal microscopy and flow cytometry results show that cyclosporin A effectively increases the dispersion of T-CUS 245C in the cytoplasm by promoting the endolysosomal escape. This study demonstrates that cyclosporin A combined with T-CUS 245C has a synergistic anticancer effect, by facilitating the release of T-CUS 245C in the intracellular space. Graphical Abstract
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JOM
·
2022
·Vol. 75
·期 6
·1982-1992
·
IF 2.597
Qiu Yuchao,Shi Junjie,Hou Changle,Dong Jingjing,Zhai Yumo,Li Kaixuan,Yan Sen,Yu Kai,Li Jianzhong,Liu Changsheng
The spinel and pseudobrookite type ceramic materials have been widely used in different industries including ceramics, refractory and metallurgy. Therefore, their physicochemical properties are important for the development of related processes. In this regard, it is important to understand the formation principles of the spinel and pseudobrookite solid solutions. In the present work, the equilibrium phase relations for the MgO-Al 2 O 3 -TiO 2 system at 1700°C in air were experimentally determined by high-temperature equilibration-quenching technique followed by XRD and SEM–EDS analyses. The pseudobrookite solid solution was found to be coexisting with spinel solid solution and rutile phase, respectively. The composition evolution and formation principles of the pseudobrookite and spinel solid solutions were further elucidated from the corresponding crystal structures and composition relations. Furthermore, great discrepancies were observed when the 1700°C isotherm from the present work was compared with the isotherm simulated by FactSage 8.1. The evolution of the solid solution existing area was intuitively presented with reference to the experimental data from the literature. The results from present work are important for the development of spinel and pseudobrookite solid solution ceramics as well as the optimization of the thermodynamic database for oxide systems.
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Science China-Materials
·
2022
·Vol. 65
·期 6
·1687-1695
·
IF 8.64
Zong Jianpeng,Ren Quan,Tian Xiaoli,Xiang Ting,Feng Yuhua,Chen Hongyu
Surface ligands play critical roles in nano-synthesis and thus it is of great importance in expanding the scope of suitable ligands. In this work, we explore phenynyl ligands in modulating the Au-Au interface when growing Au domains on Au seeds. A patchy growth mode is observed where the emerging islands are flat-laying with holes and branches. This growth mode is distinctively different from the conventional facet-controlled growth using weak ligands, and the non-wetting island growth using strong ligands. Through manipulating the molecular structure and the packing of the phenynyl ligands on the Au seeds, the overgrown Au domains are continuously tuned, from patches to islands, extending the plasmon absorption peak into the near-infrared spectral range. We believe that the new ligand with intermediate affinity and the unusual growth mode would expand the control in both synthesis and application.
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RARE METALS
·
2022
·Vol. 41
·期 6
·2084-2093
·
IF 6.318
Cai Zhuo,Ma Yi-Fei,Wang Mei,Qian A.-Niu,Tong Zhao-Min,Xiao Lian-Tuan,Jia Suo-Tang,Chen Xu-Yuan
MXene has given great promises to supercapacitor electrode material due to its high conductivity and redox properties. However, the self-agglomeration of the MXene lamella will reduce its contact area with the electrolyte and generate a tortuous transportation pathway of the electrolyte ions, thereby reducing its capacitive performance and rate capability. In this work, we engineered the electrolyte ion channels by adjusting the MXene lamella size and inserting holey graphene (HG) nanosheets into the interlayer of the MXene flakes. The developed MXene/HG electrode can not only avoid the self-restacking of MXene but also provide unimpeded ion transport channels. As a result, the supercapacitive and rate performances of the small MXene lamella-based MXene/HG (S-MXene/HG) supercapacitor are prominently ameliorated. By adjusting the content of HG, the S-MXene/HG 0.05 electrode exhibits excellent gravimetric capacitance of 446 F·g −1 and a rate capability of 77.5%. The S-MXene/HG 0.05 -based symmetric supercapacitor provides an impressive energy density of 14.84 Wh·kg −1 with excellent cyclic stability of 96% capacitance retention after 10,000 cycles. This demonstration of the engineering of the ion channels shows great potential in two-dimensional material-based supercapacitor electrodes. Graphical abstract
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MICROCHIMICA ACTA
·
2016
·Vol. 183
·期 6
·1865-1872
·
IF 4.831
Huang Pengcheng,Li Jianfang,Song Juan,Gao Nan,Wu Fangying
The authors demonstrate a single-step histidine assay that is based on the use of silver nanoparticles modified with sulfanilic acid (SAA-AgNPs). The presence of histidine leads to a visually detectable gradual color change from bright yellow via orange to purple. The effect is assumed to be mainly due to strong π-π stacking, electrostatic interaction, and hydrogen bonding between SAA and histidine. The assay has a 52.7 nM detection limit and works in the 0 to 3.5 μM concentration range. It is selective over other compounds when using appropriate masking agents. The method has been successfully applied to the colorimetric determination of histidine in (spiked) serum samples. Recoveries ranged between 97 % and 107 %, and relative standard deviations are <0.92 % (for n = 3). The method was also applied to detect polyhistidine-tagged cysteine (His-His-His-His-His-His-Cys) which can be quantified in concentrations down to 5.57 nM. This finding links the method to His-tag technology.
A single-step colorimetric assay for histidine is developed using sulfanilic acid modified silver nanoparticles (SAA-AgNPs) via π stacking, electrostatic interaction, and hydrogen bonding resulting in the aggregation of the AgNPs and a color change from yellow to orange.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 12
·1-8
·
IF 5.479
Zhuo Shujuan,Fang Jing,Li Meng,Wang Jing,Zhu Changqing,Du Jinyan
A colorimetric assay is presented for the determination of ascorbic acid (AA). Manganese(II) doped carbon dots (Mn-CDs) were prepared by a convenient hydrothermal route and are shown to possess oxidase-like catalytic ability. They catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) by dissolved oxygen to form a blue colored product (oxTMB). AA can reduce blue oxTMB to colorless TMB. The fading of the blue color (measured at 652 nm) can be applied for quantifying AA in the 50 to 2500 nM concentration range and with a 9 nM detection limit. The method was successfully used for the quantitation of AA in real samples.
Schematic representation of a colorimetric assay platform for the sensitive detection of ascorbic acid (AA) in view of inhibitory effect of AA on the 3,3′,5,5′-tetramethylbenzidine (TMB) oxidation, benefitting from excellent oxidase-like catalytic activity of manganese(II) doped carbon dots (Mn-CDs).
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CELLULOSE
·
2019
·Vol. 26
·期 16
·8789-8799
·
IF 3.917
Wang Jian,Hu Na,Liu Min,Sun Jianpeng,Xu Yaowei
Carboxymethylated cellulose fiber (CMF), a cellulose-based biosorbent, was prepared from chemi-mechanical pulp.
The CMF biosorbent showed a high stability/recovery and an excellent adsorption capacity during the metal ion removal due to its unique core–shell structure: (1) the CMF maintained a good fiber formwork even at a high carboxyl content level (175.40 mmol/100 g) due to the protection of carboxymethyl-free lignin shell on the fiber surface, thus facilitating the follow up separation/recovery of CMF; (2) the high carboxyl content in the core of CMF cellulose enabled its strong adsorption capacity towards metal ions.
The results showed that the adsorption behavior fitted well to the pseudo-second-order kinetic and the CMF had high selective adsorption towards Pb(II). The CMF also exhibited an excellent recycling performance. Therefore, the as-prepared CMF with high adsorption capacity, good solid–liquid separation and high regeneration performance indicates that the novel core–shell CMF biosorbent can provide a method to remove metal ion in practical wastewater treatment.
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