ORGANIC & BIOMOLECULAR CHEMISTRY
·
2013
·Vol. 11
·期 45
·7931-7937
·
IF 3.568
Xinhua Cao,Aiping Gao,Haiting Lv,Yan Wu,Xiuxiu Wang,Yang Fan
A new gelator 1 that included m-methyl red was synthesized and fully characterized. It was found that the organogel of 1 was stable in DMSO even if the organogel was stimulated by acid or light. The organogel was thoroughly characterized using various microscopic techniques including field-emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), UV-vis and Fourier transform infrared (FTIR) spectra. The organogel exhibited tunable structures and optical properties under different stimulation. The regular nanoring structure was turned into microspheres after the organogel in DMSO was stimulated at 254 nm light or acid. At the same time, the color of molecule 1 in gel state and solution state was all changed after stimulation by light or acid. The hydrogen bonding and π–π stacking were found to be the main driving forces for gel formation. This dual-responsive gel held promise for soft materials application in upscale smart responsive materials.
研究领域:
材料化学
·
软物质科学
✓ 已验证
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Wenxuan Li,Peifeng Li,Feiqiang He,Xiaoping Zhang,Yuling Zhu,Jianhua Ding
In this study, a foam fractionation technique was developed for the separation and enrichment of the trace m-phenylenediamine (MPD) and o-phenylenediamine (OPD) in solution. Firstly, a self-designed foam fractionation device was assembled and built, followed by a comprehensive characterization on gas types, foam fractionation column parameters, and porous sieve plate material used in the apparatus. Subsequently, the most crucial parameters for the separation and enrichment, such as surfactant species, solution pH, electrolyte categories, and gas flow rate, were identified and optimized. The mechanisms of key processes during foam fractionation under the influence of these parameters were thoroughly discussed. Other influencing factors, such as surfactant concentration, foam collection time, and solution volume in the fractionation column, were optimized using response surface methodology (RSM). Under these optimal conditions, maximal enrichment ratios of 138.2 and 85.5 were achieved for MPD and OPD, respectively. Finally, foam fractionation coupled with high-performance liquid chromatography (HPLC) was employed to detect MPD and OPD in the solution. The results demonstrated limits of detection (LOD) of 1.5 × 10 −2 μg/L and 1.5 μg/L for MPD and OPD, with relative standard deviation (RSD) values of 4.1 % and 3.9 %. When testing various actual samples, the recoveries were in the range from 92.0 % or greater in all cases. The method exhibited advantages of high sensitivity, precision, and accuracy, attributed to the high enrichment efficiency of foam fractionation. In conclusion, the foam fractionation method established in this study offers simplicity in apparatus, operational convenience, environmental friendliness (minimized use of organic solvents), and high enrichment efficiency. It proves valuable for the quantitative analysis of trace amounts of MPD and OPD in solution, presenting a novel approach for the detection of trace organic compounds in solutions.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Rui Liu,Bin Kong,Yun Chen,Xueping Liu,Shengli Mi
The helical structure is one of the most intriguing structures in nature; such an ingenious structure can be found from macromolecules to macroscopic areas, and the fabrication of helical structures has attracted research interest from mechanisms to applications. However, the fabrication of helical microfiber still remains a big challenge. In this study, a coaxial microfluidic device was made to continuously and controllably fabricate helical hydrogel microfibers with flexible shape by simply adjusting the flowrates. Various experimental conditions that can influence the diameter (d), pitch (p) and amplitude (A) of these formed coiled fibers were discussed. For the first time, the effects of G/M ratio of the alginates on the microfiber coiling phenomenon were examined. Additionally, magnetically responsive helical fibers were synthesized, and it is envisioned that hydrogel helical structure microfibers are highly versatile in different area, such as micro sensors, soft actuators and medical applications.
研究领域:
生物材料学
·
微流体技术
·
组织工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
·
2023
·
IF 4.8
Ni-Hong Yao,Xi Liu,Chenyang Luo,Lei Zou,Jinhua Li,Jing Chen,Dazhong Yan,Hong-Jun Chao
The compound m -cresol ( meta -cresol) is an important representative of alkylphenol pollutants with high toxicity and potential carcinogenicity . The genes and enzymes associated with the m -cresol pathway have not yet been well elucidated. In this study, Comamonas thiooxydans CHJ601 was isolated from industrial wastewater and cultured utilizing m -cresol as the sole source of carbon and energy. m -Cresol catabolism begins with the oxidation of its methyl group in strain CHJ601. Genome sequencing and heterologous expression of key genes revealed its detailed catabolic pathway. m -Cresol methylhydroxylase (MchAB) catalyzed o -cresol ( ortho -cresol), m -cresol, and p -cresol ( para -cresol) in the presence of NADH and FAD. The K m value of m -cresol (48.74 ± 5.02 μM) for MchAB was much lower than that of o -cresol (747.80 ± 53.34 μM) and p -cresol (541.90 ± 41.43 μM). Molecular docking analysis showed that the binding affinities of MchAB against m -cresol with two hydrogen bonds are higher than p -cresol methylhydroxylase with one. The optimal substrate of MchAB was m -cresol, which can be catalyzed into 3-hydroxybenzyl alcohol and then oxidized to 3-hydroxybenzaldehyde. The mchC gene encoded 3-hydroxybenzaldehyde dehydrogenase , which catalyzes the oxidation of 3-hydroxybenzaldehyde to 3-hydroxybenzoate. The results indicated that MchAB and MchC are the first characterized enzymes to catalyze the oxidation of the meta -methyl group of m -cresol in the strain CHJ601.
研究领域:
环境微生物学
·
分子生物学
·
生物化学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Lan-Qian Li,Xu-Hong Liu,Yong-Jian Tang,Zhen-Liang Xu
Fully aromatic polyamide (PA) membranes have been studied as nanofiltration (NF) membranes for decades because of their good chemical stability, but most of the membranes suffered from poor permeability and high rejection for monovalent ions. In this paper, an m-phenylenediamine (MPD)-based NF membrane was prepared by alkali activation on a reverse osmosis (RO) membrane. Characterization revealed the different etching paths on RO membranes fabricated by different concentrations of monomers of interfacial polymerization. The looser PA layer of RO membrane fabricated by lower-concentration monomers was easily invaded by NaOH molecules because of the higher molecular weight cutoff of 254 Da, which resulted in the transformation of separation grade from RO to NF. At the same time, the MPD-based NF membrane exhibited superior water permeability and pH resistance compared with a PIP-based membrane, which showed a potential to realize large-scale application in practical industry settings. It also provided a facile method for the preparation of a high-performance NF membrane with good chemical stability.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Superconductivity and Novel Magnetism
·
2020
·Vol. 33
·期 11
·3607-3613
·
IF 1.244
Zhang Zhanjun
In this work, we reported the Ce-Cu co-substituted M-type strontium hexaferrites Sr 0.7 Ce 0.3 Fe 12- x Cu x O 19 (0.00 ≤ x ≤ 0.50) prepared by using the solid-state method. The specific effect of Ce-Cu co-substitution on the magnetoplumbite structure and magnetic properties were studied systematically. The canonical M-type strontium hexagonal phase has been formed for our prepared sample in all doping range, which also has been confirmed by FTIR spectrum. In all compositional range, by the way, the magnetic competition of ferromagnetism-antiferromagnetism is reduced and gradually disappeared under the increasing substitution. Likewise, an obvious improvement of magnetic properties can be obtained; that is, H c increases from 2850 to 3800 Oe and the value of M s can reach up to 70.305 emu/g. The intrinsic stability and superior magnetic performance of such kind of material indicate a promising potential candidate in multilayer inductors.
研究领域:
材料科学
·
磁性材料
·
无机功能材料
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Huifen Luo,Yiping Zhang,Chengdeng Chi,Tianxing Wang,Ling Chen,Xiaoxi Li
To improve the resistance to the harsh environment of the gastrointestinal tract (GIT) and the efficiency of specific binding and uptake by intestinal epithelial cells, the GRGDS-conjugated carboxymethyl starch (R-CMS) carrier was designed and the delivery system, which can enhance M-cell transport for bioactive proteins, was developed. FTIR, 1H NMR, and elemental analysis verified that GRGDS can be successfully introduced. CLSM results indicated that R-CMS shows good targeting ability to M cells. The formation of ovalbumin (OVA)-loaded nanocapsules was driven by hydrogen bond and electrostatic interactions between negatively charged R-CMS and positively charged starch. The nanocapsules were compact in structure and the Z-average diameter was only 158.8 ± 6.58 nm, and they were relatively stable under different storage conditions. Furthermore, only 44.03% of the loaded OVA were leaked out before the fabricated nanocapsules reached the M cells during GIT delivery and the bioaccessibility of OVA was improved because the arrived nanocapsules showed higher specific binding ability and transport efficiency to M cells. Accordingly, these findings would provide a promising pathway for the development of the oral delivery system for bioactive proteins through a starch-based material that improves the targeting and transport efficiency to M cells.
研究领域:
食品科学
·
生物医学工程
·
药剂学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Meiling Chen,Xingyu Liu,Xiaole Weng,Renna Li,Zhongbiao Wu
The control of low-concentration methane (CH 4 ) emissions is a critical component of the ‘dual carbon’ strategy, and catalytic combustion technology focused on catalyst design is recognized as a promising avenue for achieving it. However, the zeolite-based catalysts are highly prone to deactivation under hydrothermal environments, thus limiting their practical applicability. Herein, we have utilized layered double hydroxides (LDHs) as precursors and integrated them with Pd/M through a co-precipitation method to fabricate Pd/M@CoAlO composite catalysts with a core–shell structure, focused on the impact of CoAlO morphology on the activity and stability for CH 4 oxidation. It revealed that the incorporation of CoAlO significantly enhanced the catalytic combustion efficiency and the hydrothermal stability of Pd/M. Furthermore, an increase in the calcination temperature led to a progressive degradation of the sheet-like or petal-shaped structure of CoAlO within the Pd/M@CoAlO composite catalysts. This structural collapse eventually resulted in the formation of CoAlO dense particles that enveloped the Pd/M, adversely affecting the adsorption of oxygen and the exposure of active sites. This work underscores the importance of morphological control, providing significant guidance for the strategic design and development of catalysts tailored for CH 4 catalytic combustion.
研究领域:
环境科学
·
催化材料学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Hanning Zhang,Mingxi Ren,Wei Jiang,Jie Yao,Limei Pan,Jian Yang
Sodium-ion batteries (SIBs) have attracted much attention owing to their abundant resources, low cost, suitable energy density and low potential window. However, SIBs still suffer from poor charge transmission kinetics caused by large Na + radius. Therefore, anode materials are considered as the key to the development of high-performance SIBs. Herein, hierarchical Sb 2 S 3 @m-Ti 3 C 2 T x composites with Sb 2 S 3 content of 40–60% were in-situ synthesized by a simple wet chemical method , in which amorphous spherical Sb 2 S 3 particles with a size of 150–200 nm nucleate and grow uniformly on the surface of m-Ti 3 C 2 T x with the formation of Ti-S bond. m-Ti 3 C 2 T x , as a three-dimensional conductive skeleton, not only improved the electron and Na + transportation, but also significantly inhibited the agglomeration and grain growth of Sb 2 S 3 particles, promoted the electrolyte penetration, and effectively absorbed the volume expansion of Sb 2 S 3 during charging and discharging cycles. As a result, the optimized 50% Sb 2 S 3 @m-Ti 3 C 2 T x showed good rate ability and cycling performance, including a capacity of 156 mAh g −1 after 100 cycles at 0.1 A g −1 and 72 mAh g −1 after 1000 cycles at 2 A g −1 with only 0.37% attenuation per cycle. This work provided a simple and effective strategy for the design and construction of MXene-based hybrids as SIBs anode.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2021
·
IF 4.311
Xiaonan Duan,Jiabin Yin,Mengmeng Huang,Aoxing Feng,Weisong Fu,Huaxiang Chen,Zhenfu Huang,Yagang Ding,Jisong Zhang
The hydrogenation of m -dinitrobenzene to m -phenylenediamine is a significant transformation for the synthesis of dyes and pigments in the fine chemical industry. Owing to the complexity of this reaction mechanism and negative effect of the first amino group on the reduction of the second nitro group, it is difficult to inhibit eminently the generation of side products and obtain m -phenylenediamine efficiently. Hence it is imperative to establish kinetic network and investigate the intrinsic kinetic parameters of this reaction for further optimization. In this study, a continuous flow system based on micro-packed bed reactor was developed and a kinetic model of the hydrogenation of m -dinitrobenzene was established successfully. The activation energies and pre-exponential factors were acquired using the kinetic network and the kinetic model exhibited reasonable fit for the transformation of each substance. Moreover, the influence of pressure was investigated, and the accuracy of kinetic model was validated by the comparison with the values in literature. This kinetic model enabled the accurate determination of kinetic parameters with Pt/C and Ni/SiO 2 catalysts, and provided the rate determining steps and characteristics of different catalysts for the process optimization.
研究领域:
化学工程
·
催化反应动力学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Kai-Yao Wang,Yang Liu,Jia-Ying Zhu,Lin Cheng,Cheng Wang
Deep investigations on the synthetic and structural chemistry of heterometallic chalcogenidostannates bear fundamental significance for the establishment of the structure–property relationship that would offer guidance on the functional material innovation. Presented here are four ammonium- and/or alkylammonium-directed M–Sn–Q (M = Zn, Cd; Q = S, Se) compounds, namely, [NH4]7[H3O]3Zn4Sn4S17 (1), [NH4]5[(CH3)2NH2]Zn4Sn5S17 (2), [CH3CH2NH3]22Zn16Sn12Se51(H2O)4·16H2O (3), and [NH4]2CdSnSe4 (4). All four compounds were synthesized in deep eutectic solvents (DESs) or ethylamine aqueous solution, both of which function simultaneously as reaction media and structure-directing agents. Compound 1 consists of discrete P1-[Zn4Sn4S17]10– clusters templated by mixed [NH4]+/[H3O]+ cations. In compound 2, such P1 clusters are bridged by Sn4+ ions in a 4,4-connection mode to form a [Zn4Sn5S17]n6n– framework with three types of cavities (I–III) varying in size. The two smaller cavities (I and II) accommodate NH4+ while the larger one(III) is occupied by [(CH3)2NH2]+, reflecting the rational size-dependence of cations on cavities. Compound 3 features an [Zn16Sn12Se51(H2O)4]n22n– open framework constructed from the 4,3-connection of P1-[Zn4Sn4Se17]10– clusters and {Zn(H2O)}2+ bridges. This linkage mode contributes to a large cage-like subunit (inner dimension: 21.99 × 9.06 Å2) and therefore an ultrahigh porosity that are occupied by [CH3CH2NH3]+ cations and water molecules (volume fraction: 57.7%). Compound 4 exists as a stacking of [CdSnSe4]n2n– chains, which are composed of alternatively arranged {CdSe4} and {SnSe4} tetrahedra, in combination with [NH4]+ cations as both charge-compensating and space-filling agents. Detailed synthetic, structural, and topological analyses were performed on these solid materials, coupled with extensive investigations on their optical and thermal properties. Compound 3 exhibits an efficient Sr2+ adsorption performance, featuring ultrafast kinetics (94.69% in 5 min), high removal rate (98.57% in 20 min) at equilibrium, and high capacity (104.17 ± 23.53 mg g–1).
研究领域:
无机化学
·
材料科学
·
环境化学
✓ 已验证
DOI
高影响因子
Nanomedicine
·
2018
·
IF 5.005
Yuanyuan Xie,Xiaofan Zeng,Xian Wu,Jun Hu,Yanhong Zhu,Xiangliang Yang
Aim: To study the effects of combinational treatment of hyperbaric oxygen (HBO) and nanotemozolomide in glioma. Materials & methods: Temozolomide (TMZ)-loaded porous silicon nanoparticles (TMZ/PSi NPs) were prepared. In vitro and in vivo evaluations were performed. Results: The cell uptake of TMZ/PSi NPs could be tracked by autofluorescence of porous silicon. The concentration of oxygen in tumor was improved and the antitumor rate was increased to 84.2% in the TMZ/PSi NPs combined with HBO group. The viability of hypoxia-induced glioma C6 cells was decreased and cell cycle was arrested at G2/M phase in response to TMZ/PSi NPs treatment with HBO compared with continuous treatment with hypoxia. Conclusion: The combinational treatment of TMZ/PSi NPs and HBO could be a promising therapeutic strategy for glioma.
研究领域:
肿瘤学
·
药理学
·
神经科学
✓ 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）