APPLIED ORGANOMETALLIC CHEMISTRY
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2019
·Vol. 33
·期 10
·e5145
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IF 3.259
Zhiguo Lv,Shuying Zhang,Zhenmei Guo,Xi Cheng,Jiaomei Wang,Chao Zhang
The synthesis of alcohol ester 12 is one of the valuable industrial processes, but it was impeded by poor separating property and recycling ability of the catalytic systems. Herein, four novel DBU-based basic ionic liquids (DBILs) of [BDBU]IM, [BDBU]OH, [ODBU]IM, [[ODBU]OH were synthesized successfully by introducing the alkyl chains of 1-bromobutane or 1-bromooctane to 1,8-diazabicyclo [5.4.0] undec-7-ene (DBU), and then, employing imidazole (IM − ) or hydroxide (OH − ) as counter ions. The above obtained four ionic liquids were applied in the synthesis of alcohol ester 12 in isobutyraldehyde (IBD)/aqueous media for the first time. Interestingly, after reaction, production of alcohol ester 12 can be self-separated from ionic liquids/water (ILs/W) catalytic system automatically. Furthermore, the self-separated ILs/W can be recycled and used in next catalytic reaction for at least 5 times without obvious loss of catalytic performance. In this work, the structure, purity, thermal stability and alkalinity of DBILs were characterized systematically. [BDBU]IM shows high alkalinity and thus enhances yield of 66.17%. From thermo gravimetric analyzer (TGA), [BDBU]IM also exhibits excellent thermal stability. So [BDBU]IM was chosen for the further studying. Furthermore, quantum chemistry is applied to calculate the interaction forces and electron energies of reactants by DFT, and the calculation results illustrate the feasibility of synthetic process of DBILs. The self-separation strategy of DBILS in this work may open up a new avenue for the clean synthesis of other industrial products.
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高影响因子
JOURNAL OF LUMINESCENCE
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2019
·
IF 2.961
Ya-Li Xue,Dan Zhao,Li-Na Zhang,Xiao-Qi Cui,Xiao-Yang Han,Qing-Xia Yao
For the first time, rare-earth phosphate compound Cs 4 PbTb 2 (PO 3 ) 12 was prepared using molten salt method and structurally characterized by single-crystal X-ray diffraction (XRD). Its structure features a three-dimensional (3D) open framework constructed by P 4 O 12 cyclotetraphosphate groups and (Pb|Tb)O 8 polyhedra, with large holes filling with Cs + ions. The P 4 O 12 groups in this structure are isolated and each P 4 O 12 is surrounded by four (Pb|Tb)O 8 polyhedra by sharing terminal O atoms. Furthermore, the powder XRD , infrared (IR) spectrum, Ultraviolet–visible (UV–Vis) spectroscopy and photoluminescence (PL) properties for title compound were studied. Under near-UV excitation (378 nm), the emission colour turns from green through yellow to pure red by simply adjusting the Eu 3+ concentration due to the efficient Tb 3+ →Eu 3+ energy transfer mechanism.
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高影响因子
CRYSTENGCOMM
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2017
·Vol. 19
·期 44
·6644-6650
·
IF 3.474
Ying-Jie Jia,Yi-Gang Chen,Xiao-Ni Yao,Xian-Ming Zhang
A series of alkali earth cadmium selenites including MgCd3(SeO3)4 (1), Ca0.7Cd2.3(SeO3)3 (2), SrCd(SeO3)2 (3) and BaCd(SeO3)2 (4) are synthesized by hydrothermal reaction and studied in detail by single crystal and powdered X-ray diffractions, thermal analyses, IR and UV spectral measurements and dipole moment calculation. 1 features a 3D anionic [Cd3(SeO3)4]2− framework constructed from isolated SeO3 trigonal pyramids and 2D [Cd3O12]n layers, in which the [Cd3O12]n layer is composed of edge-shared [Cd2O10]16− dimers and butterfly-like [Cd4O20]32− tetramers. 2 shows a smooth 2D [Cd2(SeO3)3]n layer composed of unique [Cd(SeO3)]n double chains. 3 exhibits a wavelike 2D [Cd(SeO3)2]n layer constructed from corner-shared CdO6 octahedra and isolated SeO3 trigonal pyramids. 4 displays a windmill-like 1D [Cd(SeO3)2]n chain built from zigzag [CdO4]n chain motifs and isolated SeO3 trigonal pyramids. The alkali earth oxide motifs demonstrate interesting and regular changes from isolated MgO6 octahedra, CaO7 polyhedra, and SrO9 tri-capped trigonal prisms based on a ribbon chain to BaO12 icosahedra based on a brucite-like layer, and meanwhile the SeO3 groups are observed from variable tetradentate to hexadentate coordination modes. These flexible motifs reveal that cadmium selenites are strongly affected by the size of the alkali earth cations, providing a feasible approach to modulating their space structure via selection of template cation.
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高影响因子
Pigment & Resin Technology
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2024
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IF 1.3
Xinrui Wang,Xiaomeng Hu,Xiangnan Feng,Xinyu Han,Qi Liu,Yueqin Li
PurposeThis study aims to produce composite pigments, including SHS/ZnAl-LDHs, IDS/ZnAl-LDHs and SNND/ZnAl-LDHs, with improved coloration, enhanced photostability and thermostability and biocompatibility.Design/methodology/approachThe chemical structures of the composite pigments were characterized by X-ray diffraction spectroscopy and Fourier transform infrared spectroscopy. Photostability and thermal stability were assessed using ultraviolet-visible spectroscopy and colorimetry. The coverage of the dyes was determined through black-and-white tile testing, and specific RGB values were used to indicate color expressiveness. Finally, a four-color eyeshadow was formulated, and safety tests were conducted via human patch test and cellular assays to confirm the safety and reliability of the samples.FindingsThe experimental results demonstrate an enhancement in the photo and thermal stability of the SHS/ZnAl-LDHs, IDS/ZnAl-LDHs and SNND/ZnAl-LDHs composites, along with their superior performance in terms of covering power and color saturation. These composite pigments also exhibit high safety, making them well-suited for cosmetic applications.Practical implicationsThe composite pigments based on hydrotalcite can be used in the cosmetic industry without causing any harm to the environment and human health.Originality/valueThe addition of hydrotalcite enables better application of pigments in cosmetics.
研究领域:
化妆品科学
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材料化学
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高影响因子
ANTI-CORROSION METHODS AND MATERIALS
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2024
·Vol. 71
·期 5
·514-528
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IF 2.3
Xiaohu Wen,Xiangkang Cao,Xiao-ze Ma,Zefan Zhang,Zehua Dong
PurposeThe purpose of this paper was to prepare a ternary hierarchical rough particle to accelerate the anti-corrosive design for coastal concrete infrastructures.Design/methodology/approachA kind of micro-nano hydrophobic ternary microparticles was fabricated from SiO2/halloysite nanotubes (HNTs) and recycled concrete powders (RCPs), which was then mixed with sodium silicate and silane to form an inorganic slurry. The slurry was further sprayed on the concrete surface to construct a superhydrophobic coating (SHC). Transmission electron microscopy and energy-dispersive X-ray spectroscopy mappings demonstrate that the nano-sized SiO2has been grafted on the sub-micron HNTs and then further adhered to the surface of micro-sized RCP, forming a kind of superhydrophobic particles (SiO2/HNTs@RCP) featured of abundant micro-nano hierarchical structures.FindingsThe SHC surface presents excellent superhydrophobicity with the water contact angle >156°. Electrochemical tests indicate that the corrosion rate of mild steel rebar in coated concrete reduces three-order magnitudes relative to the uncoated one in 3.5% NaCl solution. Water uptake and chloride ion (Cl-) diffusion tests show that the SHC exhibits high H2O and Cl-ions barrier properties thanks to the pore-sealing and water-repellence properties of SiO2/HNTs@RCP particles. Furthermore, the SHC possesses considerable mechanical durability and outstanding self-cleaning ability.Originality/valueSHC inhibits water uptake, Cl-diffusion and rebar corrosion of concrete, which will promote the sustainable application of concrete waste in anti-corrosive concrete projects.
研究领域:
土木工程
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材料科学
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高影响因子
BMC PLANT BIOLOGY
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2012
·Vol. 12
·期 1
·1-16
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IF 3.447
Zeng Qiao-Ying,Yang Cun-Yi,Ma Qi-Bin,Li Xiu-Ping,Dong Wen-Wen,Nian Hai
Background MicroRNAs (miRNAs) play important regulatory roles in development and stress response in plants. Wild soybean (Glycine soja) has undergone long-term natural selection and may have evolved special mechanisms to survive stress conditions as a result. However, little information about miRNAs especially miRNAs responsive to aluminum (Al) stress is available in wild soybean.Results Two small RNA libraries and two degradome libraries were constructed from the roots of Al-treated and Al-free G. soja seedlings. For miRNA identification, a total of 7,287,655 and 7,035,914 clean reads in Al-treated and Al-free small RNAs libraries, respectively, were generated, and 97 known miRNAs and 31 novel miRNAs were identified. In addition, 49 p3 or p5 strands of known miRNAs were found. Among all the identified miRNAs, the expressions of 30 miRNAs were responsive to Al stress. Through degradome sequencing, 86 genes were identified as targets of the known miRNAs and five genes were found to be the targets of the novel miRNAs obtained in this study. Gene ontology (GO) annotations of target transcripts indicated that 52 target genes cleaved by conserved miRNA families might play roles in the regulation of transcription. Additionally, some genes, such as those for the auxin response factor (ARF), domain-containing disease resistance protein (NB-ARC), leucine-rich repeat and toll/interleukin-1 receptor-like protein (LRR-TIR) domain protein, cation transporting ATPase, Myb transcription factors, and the no apical meristem (NAM) protein, that are known to be responsive to stress, were found to be cleaved under Al stress conditions.Conclusion sA number of miRNAs and their targets were detected in wild soybean. Some of them that were responsive to biotic and abiotic stresses were regulated by Al stress. These findings provide valuable information to understand the function of miRNAs in Al tolerance.
研究领域:
植物科学
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分子生物学
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胁迫生理学
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PubMed
高影响因子
INDUSTRIAL LUBRICATION AND TRIBOLOGY
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2024
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IF 1.5
Hui Zhao,Shunzhen Ren,Zhengbo Zhong,Zhipeng Li,Tianhui Ren
PurposeThis study aims to reveal the tribological mechanism of synergistic effect between MoDTC and P-containing additives in aluminum-based grease.Design/methodology/approachThe authors prepared a molybdenum dialkyl dithiocarbamate (MoDTC) and revealed the tribological mechanism of synergistic effect between MoDTC and P-containing additives in aluminum-based grease by combining with ZDDP and P-containing and S-free additives.FindingsThe MoDTC the authors prepared has good friction-reducing and anti-wear properties in aluminum-based grease and has an obvious synergistic effect with ZDDP. MoDTC and ZDDP have a significant synergistic effect on the tribological properties in aluminum-based grease, mainly because of the formation of phosphates and metaphosphates as well as more MoS2in the friction film. P element plays a facilitating role in the chemical conversion of MoDTC to MoS2.Originality/valueThe experiments of MoDTC with tributyl phosphate and trimethylphenyl phosphate confirm that the P element plays a facilitating role in the chemical conversion of MoDTC into MoS2.Peer reviewThe peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-12-2023-0410
研究领域:
材料科学
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摩擦学
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化学工程
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高影响因子
Pigment & Resin Technology
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2023
·Vol. 53
·期 5
·638-649
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IF 1.4
Shan Peng,Ranran Yang,Binglong Lei,Yun Gao,Renhua Chen,Xiaohong Xia,Kevin P. Homewood
PurposeThis paper aims to systematically demonstrate a methodology to determine the relative and absolute encapsulation efficiencies (αReandαAb) for thermally- and chemically-robust inorganic pigments, typically like ZrSiO4-based pigments, thereby enhancing their coloring performance.Design/methodology/approachThe authors designed a route, surplus alkali-decomposition and subsequently strong-acid dissolution (SAD2) to completely decompose three classic zircon pigments (Pr–ZrSiO4, Fe2O3@ZrSiO4and CdS@ZrSiO4) into clear solutions and preferably used inductively coupled plasma-optical emission spectrometry (ICP-OES) to determine the concentrations of host elements and chromophores, thereby deriving the numeric data and interrelation ofαReandαAb.FindingsZircon pigments can be thoroughly decomposed into some dissoluble zirconate–silicate resultants by SAD2 at a ratio of the fluxing agent to pigment over 6. ICP-OES is proved more suitable than some other quantification techniques in deriving the compositional concentrations, thereby the values ofαReandαAb, and their transformation coefficientKRA, which maintains stably within 0.8–0.9 in Fe2O3@ZrSiO4and CdS@ZrSiO4and is slightly reduced to 0.67–0.85 in Pr–ZrSiO4.Practical implicationsThe SAD2 method and encapsulation efficiencies are well applicable for both zircon pigments and the other pigmental or non-pigmental inhomogeneous systems in characterizing their accurate composition.Originality/valueThe authors herein first proposed strict definitions for the relative and absolute encapsulation efficiencies for inorganic pigments, developed a relatively stringent methodology to determine their accurate values and interrelation.
研究领域:
材料科学
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分析化学
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高影响因子
World Journal of Surgical Oncology
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2014
·Vol. 12
·期 1
·6
·
IF 1.2
Dong Yong-Qiang,Liang Jiang-Shui,Zhang Xiao-Ming,Zhu Shui-Bo,Xu Jia-Hang,Ji Tao,Yin Gui-Lin
Although invasive thymoma commonly infiltrates neighbouring mediastinal structures, its extension into the superior vena cava (SVC) and consequent SVC occlusion are rare. In such cases, the urgent removal of the thymoma and radical resection of the infiltrated SVC representreasonable options, since induction therapy is time-consuming and useless for symptom resolution. A case of invasive thymoma extending into the SVC and right atrium (RA) with SVC syndrome is reported. The patient underwent a combined resection of the invasive tumor and SVC under cardiopulmonary bypass (CPB), and the SVC and bilateral brachiocephalic vein (BCV) were reconstructed with an autologous pericardial ‘Y’ conduit. After 40 months of follow-up, the patient showed a patent graft and no tumor recurrence.
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高影响因子
INDUSTRIAL LUBRICATION AND TRIBOLOGY
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2023
·Vol. 75
·期 5
·484-496
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IF 1.6
Ting Li,Xianggang Chen,Junhai Wang,Lixiu Zhang,Xinran Li,Xiaoyi Wei
PurposeThe purpose of this study is to prepare ZnFe2O4nanospheres, sheet MoS2and three ZnFe2O4@MoS2core-shell composites with various shell thicknesses, and add them to the base oil for friction and wear tests to simulate the wear conditions of hybrid bearings.Design/methodology/approachThrough the characterization and analysis of the morphology of wear scars and the elemental composition of friction films, the tribological behavior and wear mechanism of sample materials as lubricant additives were investigated and the effects of shell thickness and sample concentration on the tribological properties of core–shell composite lubricant additives were discussed.FindingsThe findings demonstrate that each of the five sample materials can, to varying degrees, enhance the lubricating qualities of the base oil and that the core–shell nanocomposite sample lubricant additive has superior lubricating properties to those of ZnFe2O4and MoS2alone, among them ZnFe2O4@MoS2-2 core–shell composites with moderate shell thickness performed most ideally. In addition, the optimal concentration of the ZnFe2O4@MoS2lubricant additive was 0.5 Wt.%, and a concentration that was too high led to particle deposition and affected the friction effect.Originality/valueIn this work, ZnFe2O4@MoS2core–shell composites were synthesized for the first time using ZnFe2O4as the carrier and the lubrication mechanism of core–shell composites and single materials were compared and studied, which illustrated the advantages of core–shell composite lubricant additives. At the same time, the influence of different shell thicknesses on the lubricant additives of core–shell composites was studied.Peer reviewThe peer review history for this article is available at:https://publons.com/publon/10.1108/ILT-12-2022-0367/
研究领域:
材料科学
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表面工程
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纳米技术
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高影响因子
Heritage Science
·
2013
·Vol. 1
·期 1
·1-10
·
IF 0
Zhao Jing,Luo Hongjie,Wang Liqin,Li Weidong,Zhou Tie,Rong Bo
The use of organic–inorganic hybrid compounds containing tetraethoxysilane (TEOS) and hydroxyl-terminated polydimethylsiloxane (PDMS-OH) is one of the most promising approaches for using alkoxysilane-based formulations to improve the effectiveness of the consolidation of traditional silicate artifacts, such as ancient stone. Based on analysis of existing damaged potteries influenced by the crystallization of NaCl salt, the hybrid we prepared in this study provided a crack-free and homogeneous gel on the premise of appropriate PDMS-OH content. The consolidants were applied to samples prepared following procedures that simulate old pottery and the effect of the protective products was evaluated by characterizing the surface morphology, the determination of the consolidant uptake, color changes, water vapour permeability and several wet-dry cycles with salt. The best formulation found for the hybrid in the present work was made up of 10% PDMS-OH with TEOS, which showed a significant increase in compressive strength, with a value of 3.50 MPa at 3 mm depth of consolidation, similar to the sample treated with Primal SF(the commercial protective agents used for comparison purposes), which had 3.20 MPa in compressive strength at 2 mm depth of consolidation. Except for small color changes and excellent water vapor permeability, there was still no significant change, and the destructive effects from NaCl crystallization for the hydrophobic surface of the sample treated with hybrid material was different to what happened for the hydrophilic case in the original. Thus, this study has revealed, for the first time, the addition of an appropriate amount of PDMS-OH to TEOS helps to improve the mechanical properties, hydrophobic behavior and salt resistance of damaged pottery effloresced by the NaCl crystals; in addition small color changes and excellent water vapor permeability should also be taken into consideration.
研究领域:
材料科学
·
文物保护
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2019
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IF 3.973
Menghang Zu,Heliang Song,Jiabin Zhang,Qiubing Chen,Shiqin Deng,Brandon S.B. Canup,Yi Yuan,Bo Xiao
Edible plant-derived nanoparticles (NPs) have attracted increasing attention in the treatment of ulcerative colitis (UC). Lycium barbarum (LB), a popular functional fruit, possesses various biological functions. Here, fat-soluble contents were extracted from LB and further processed into LB lipid-derived NPs (LBLNs). The resultant NPs had an average hydrodynamic diameter around 189.2 nm, narrow size distribution (polydispersity index = 0.2), and negative surface charge (-34.9 mV). Moreover, they could be efficiently taken up by UC therapy-related target cells (macrophages), and over 69.0 % of macrophages internalized LBLNs after 4 h co-incubation. We further found from the in vitro results that LBLNs had strong capacities to inhibit the secretion of the main pro-inflammatory cytokines (TNF-α and IL-12) and up-regulate the expression of the typical anti-inflammatory factor (IL-10). Finally, mice experiments confirmed that LBLNs after oral administration could specifically accumulate into inflamed colon tissues, and further attenuate UC-relevant symptoms ( e.g. , bodyweight loss, colon shortening, increase of spleen weight, and histopathological appearance, as well as ulceration). Collectively, this study demonstrates the excellent therapeutic outcomes of LBLNs against UC and provides a promising edible nanotherapeutic for UC treatment.
研究领域:
药理学
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纳米技术
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炎症性肠病
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药物递送系统
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）