POLYMER
·
2016
·
IF 3.586
Sheng Zhou,Mengyao Zhang,Rong Wang,Jing Ping,Xiaoli Zhang,Ning Zhao,Jian Xu,Zhihao Shen,Xinghe Fan
Two monomers o -( m -triphenyl)-terephthaloyl chloride (TPH1-COCl) and m -( m -triphenyl)- isophthaloyl chloride (TPH2-COCl) with bulky pendant groups were prepared, and they were polymerized with p -phenylenediamine (PPD) or copolymerized with PPD and terephthaloyl chloride (TPC) to prepare aromatic polyamides which were named TPH1 polymer and TPH2 polymer, respectively. The structures of the monomers with bulky pendant groups and the polymers were characterized by 1 H NMR and gel permeation chromatography . The resulting polymers are soluble in some organic solvents such as N -methyl-2-pyrrolidone. However, the solubility of the two series of polymers was different due to the different structures of the two monomers, and it is affected by the feeding ratio of the monomers. Both kinds of polymers have good thermal stabilities with 5% weight loss temperatures close to 500 °C. And glass transitions of some TPH2 polymers were observed. Most of these polyamides show lyotropic liquid crystalline (LLC) behaviors as evidenced by polarized light microscopy results. And the LLC properties are influenced by the structures, molecular weights , and concentrations of the polymers.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
JOURNAL OF PHASE EQUILIBRIA AND DIFFUSION
·
2017
·Vol. 38
·期 1
·30-36
·
IF 0.938
Sun W. Z.,Cheng J. G.,Huang Z. K.,Jiang Y.,Wu L. E.,Liu L. M.
The present work determined the phase relations in Si-Al-M-O-C (M = Zr, Mg) systems, involving SiC-Al 2 O 3 -ZrO 2 , SiC-Al 2 O 3 -MgO, SiC-SiO 2 -Al 2 O 3 -ZrO 2 and SiC-SiO 2 -Al 2 O 3 -MgO systems by XRD phase analyses of the solid-state reacted samples from powder mixtures of SiC, Al 2 O 3 , ZrO 2 , MgO and SiO 2 . Within these systems, SiC was respectively compatible with other neighboring phases, forming a set of four-phase compatibility tetrahedrons. The subsolidus phase diagrams of the SiC-SiO 2 -Al 2 O 3 -ZrO 2 and SiC-SiO 2 -Al 2 O 3 -MgO quaternary systems were presented.
研究领域:
材料科学
·
陶瓷学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF ONCOLOGY
·
2023
·Vol. 62
·期 5
·1-21
·
IF 5.2
Ting Xue,Yaodong Chen,Jia Xu,Weiqin Du,Pengzhou Kong,Xinri Zhang
Lung cancer is the leading cause of cancer‑related mortality worldwide. Non‑small cell lung cancer (NSCLC) is the most common pathological subtype of lung cancer and is associated with low 5‑year overall survival rates. Therefore, novel and effective chemotherapeutic drugs are urgently required for improving the survival outcomes of patients with lung cancer. Cyclovirobuxine D (CVB‑D) is a natural steroidal alkaloid, used for the treatment of cardiovascular diseases in Traditional Chinese Medicine. Several studies have also demonstrated the antitumor effects of CVB‑D. Therefore, in the present study, the therapeutic effects of CVB‑D in lung cancer and the underlying mechanisms were investigated using the in vivo xenograft model of NSCLC in nude mice and in vitro experiments with the NSCLC cell lines. Bioinformatics analyses of RNA‑sequencing data, and cell‑based functional assays demonstrated that CVB‑D treatment significantly inhibited in vitro and in vivo NSCLC cell proliferation, survival, invasion, migration, angiogenesis, epithelial‑to‑mesenchymal transition and G2/M phase cell cycle. CVB‑D exerted its antitumor effects by inhibiting the KIF11‑CDK1‑CDC25C‑cyclinB1 G2/M phase transition regulatory oncogenic network and the NF‑κB/JNK signaling pathway. CVB‑D treatment significantly reduced the sizes and weights and malignancy of xenograft NSCLC tumors in the nude mice. In conclusion, the present study demonstrated that CVB‑D inhibited the growth and progression of NSCLC cells by inhibiting the KIF11‑CDK1‑CDC25C‑CyclinB1 G2/M phase transition regulatory network and the NF‑κB/JNK signaling pathway. Therefore, CVB‑D is a promising drug for the treatment of NSCLC patients.
研究领域:
肿瘤学
·
药理学
·
分子生物学
·
细胞生物学
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产品关联
DOI
PubMed
高影响因子
Food Chemistry-X
·
2024
·
IF 6.5
Haotian Xu,Zeyu Wang,Zhenyang Qin,Minwei Zhang,Yanan Qin
This study investigates the variation of physicochemical, flavonoids, and volatiles during sequential fermentation which Metschnikowia pulcherrima and Issatchenkia terricola as sequential co-fermenters and a single fermentation by Saccharomyces cerevisiae in mulberry wine. Sequential fermentation shown that β-glucosidase activity greater and fermentation time declined to 144 h. In addition, 11 flavonoids (apigenin-5-O-glucoside, aromadendrin-7-O-glucoside, kaempferol-3,7-O-diglucoside, and so on) were significantly increased. Significant differences were found between types of metabolic products enriched in flavone and flavonol biosynthesis and anthocyanins biosynthesis, with an enrichment ratio of 46.15 % and 23.08 %, respectively. 16 apple-scented compounds (2-Buten-1-one, (E)-1-(2,6,6-trimethyl-1,3-cyclohexadien-1-yl)-, Butanoic acid, (Z)-3-hexenyl ester, 3-methyl-1-methylethyl-Butanoic acid ester, and so on), 5 rose-scented (e.g. benzyl alcohol, ethyl geranate, hydrocinnamic acid), and 4 balsamic-scented compounds ((−)-myrtenol, benzoic acid 1-methylethyl ester, benzyl alcohol, p-cymen-7-ol) were distinctively present. Interestingly, tryptophan metabolism and indole alkaloid biosynthesis are only enriched in sequential fermentation.
研究领域:
发酵科学
·
食品化学
·
葡萄酒科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2023
·Vol. 25
·期 22
·15547-15554
·
IF 3.3
Changyin Zhong,Yifei Yang,Yun Fang,Jun Chen,Bomin Feng,Hongbing Wang,Wenhua Luo,Yunxi Yao
Lanthanum oxide (La2O3) possesses superior reactivity during catalytic hydrogenation, but the intrinsic activity of La2O3 toward H2 adsorption and activation remains unclear. In the present work, we fundamentally investigated hydrogen interaction with Ni-modified La2O3. Hydrogen temperature programmed desorption (H2-TPD) on Ni/La2O3 shows enhanced hydrogen adsorption with a new hydrogen desorption peak at a higher temperature position compared to that on the metallic Ni surfaces. By systematically exploring the desorption experiments, the enhanced H2 adsorption on Ni/La2O3 is due to the oxygen vacancies formed at the metal–oxide interfaces. Hydrogen atoms transfer from Ni surfaces to the oxygen vacancies to form lanthanum oxyhydride species (H–La–O) at the metal–oxide interfaces. The adsorbed hydrogen at the metal–oxide interfaces of Ni/La2O3 results in improved catalytic reactivity in CO2 methanation. Furthermore, the enhanced hydrogen adsorption on the interfacial oxygen vacancies is ubiquitous for La2O3-supported Fe, Co, and Ni nanoparticles. Benefiting from the modification effect of the supported transition metal nanoparticles, the surface oxyhydride species can be formed on La2O3 surfaces, which resembles the recently reported oxyhydride observed on the reducible CeO2 surfaces with abundant surface oxygen vacancies. These findings strengthen our understanding of the surface chemistry of La2O3 and shed new light on the design of highly efficient La2O3-based catalysts with metal–oxide interfaces.
研究领域:
催化
·
表面化学
·
材料科学
✓ 已验证
DOI
高影响因子
Catalysts
·
2014
·Vol. 4
·期 3
·276-288
·
IF 0
Haiyang Cheng,Weiwei Lin,Xiaoru Li,Chao Zhang,Fengyu Zhao
Series catalysts of Ru-SnOx/Al2O3with varying SnOxloading of 0–3 wt% were prepared, and their catalytic activity and selectivity have been discussed and compared for the selective hydrogenation ofm-dinitrobenzene (m-DNB) tom-nitroaniline (m-NAN). The Ru-SnOx/Al2O3catalysts were characterized by X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and hydrogen temperature-programmed reduction (H2-TPR) and desorption (H2-TPD). Under the modification of SnOx, the reaction activity increased obviously, and the best selectivity tom-NAN reached above 97% at the complete conversion ofm-DNB. With the increasing of the SnOxloading, the amount of active hydrogen adsorption on the surface of the catalyst increased according to the H2-TPD analysis, and the electron transferred from Ru to SnOxspecies, as determined by XPS, inducing an electron-deficient Ru, which is a benefit for the absorption of the nitro group. Therefore, the reaction rate and product selectivity were greatly enhanced. Moreover, the Ru-SnOx/Al2O3catalyst presented high stability: it could be recycled four times without any loss in activity and selectivity.Keywords:Ru catalyst;SnOxdoping;hydrogenation;m-dinitrobenzene;m-nitroaniline;catalyst recycling
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
PHYSICA B-CONDENSED MATTER
·
2025
·
IF 2.8
Rongbo Ma,Xinyong Gong,Chaoyong Deng,Weichao Huang
To develop novel luminescent materials for optical thermometry, a series of La 2 MgSnO 6 :Mn 4+ , M (M=Bi 3+ , Sm 3+ ) phosphors were prepared by the solid-state method. Upon UV excitation, the La 2 MgSnO 6 : Mn 4+ sample demonstrates strong red emission originating from the 2 E g → 4 A 2g transition of Mn 4+ . By co-doping with Bi 3+ or Sm 3+ , it becomes possible to achieve tunable emission in La 2 MgSnO 6 phosphors. Due to the different thermal quenching behavior between the Mn 4+ and Bi 3+ or Sm 3+ , a high-sensitivity thermometric was developed using the fluorescence intensity ratio mode. The maximum sensitivity was obtained to 1.5%K -1 at 473K. The emission spectra of La 2 MgSnO 6 : Mn 4+ , M (M=Bi 3+ , Sm 3+ ) phosphor significantly coincide with the absorption spectra of plant pigments in the blue and red regions. These findings indicate that the as-prepared La 2 MgSnO 6 : Mn 4+ , M (M=Bi 3+ , Sm 3+ ) phosphors are promising candidate materials for plant cultivation and high-temperature optical thermometry.
研究领域:
材料科学
·
光学
·
植物学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2025
·Vol. 15
·期 15
·4515-4527
·
IF 4.2
Huawei Xie,Bei-Bei Zhang,Fang-Xing Xiao
Antimony sulfide (Sb2S3) has been deemed a promising semiconductor for solar energy conversion owing to its suitable energy level position. However, so far, Sb2S3-based photocatalytic systems have been poorly reported, making Sb2S3-dominated photocatalytic mechanisms elusive. Herein, an efficient electrostatic self-assembly strategy was developed to fabricate metal nanocrystal (NC)-functionalized Sb2S3 nanorod (Sb2S3 NRs-M, M = Au, Ag, Pd) heterostructures. The tartaric acid (TA) molecules grafted on the Sb2S3 NR surface served as coordination sites, which enabled the self-assembly of the metal precursor on the Sb2S3 NR surface via electrostatic and coordinate interactions. The as-prepared Sb2S3 NRs-M (M = Au, Ag, Pd) heterostructures demonstrated significantly enhanced photoactivities toward the mineralization of organic pollutants under visible light irradiation, surpassing those of the pristine Sb2S3 NR counterpart. The contributing role of metal NCs as “electron reservoirs” in boosting the charge separation was determined. Furthermore, active species participating in the photocatalytic reaction were determined, and the photocatalytic mechanism was unveiled. This study offers an efficacious strategy for the rational construction of metal NC-functionalized Sb2S3 NRs for widespread photocatalytic applications.
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产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2021
·
IF 7.033
Enkang Fu,Yu Qiu,Huaichang Lu,Sijun Wang,Lishan Liu,Hanjun Feng,Yanxin Yang,Zizhan Wu,Yunlong Xie,Feng Gong,Rui Xiao
Ammonia (NH 3 ) has been regarded as an attractive energy source for hydrogen production via catalytic decomposition , especially over non-noble metal catalysts . Owing to the decent performance and low cost, nickel (Ni) based catalysts have been widely studied for catalytic decomposition of NH 3 where the decomposition rates, can be further tailored by adding other metals. Herein, we synthesized bimetallic M(M = Co, Fe, Cu)Ni/Al 2 O 3 catalysts delivering superior catalytic performance at a wide temperature range of 350–750 °C. Co-Ni/Al 2 O 3 demonstrated nearly 100% conversion of NH 3 decomposition to H 2 at 700 °C and the gas hourly space velocity of 30,000 ml g −1 min −1 , which was ~20.85% higher than that of intrinsic Ni/Al 2 O 3 . The structural characterizations indicated that Co could decrease the particle size and enhance the dispersion of active sites. The density functional theory calculations substantiated that the associative decomposition of N to generate N 2 was the rate-determining step of the NH 3 decomposition reactions . NH 3 Temperature Programmed Desorption (TPD) results suggested that the enhanced catalytic performance was predominantly attributed to the Co that decreases the energy barrier for the associative decomposition of N to form N 2 . This study provides new insights in designing diverse catalysts for efficient NH 3 decomposition for controllable H 2 production.
研究领域:
催化化学
·
能源材料科学
✓ 已验证
DOI
高影响因子
Science China-Materials
·
2020
·Vol. 63
·期 9
·1769-1778
·
IF 6.098
Xu Jingjing,Wu Hongping,Yu Hongwei,Hu Zhanggui,Wang Jiyang,Wu Yicheng
Alike phosphates, silicates and germanates exclusively containing tetrahedral basic building units (BBUs) can also exhibit ultraviolet (UV) even deep-UV transitions. They are important for the design of new UV or deep-UV nonlinear optical (NLO) materials. In this paper, four new alkali metal silicates and germanates, Li 2 Rb 4 Si 6 O 15 , Li 2 Cs 4 Si 6 O 15 , Li 3 Rb 3 Ge 6 O 15 and Li 3 Cs 3 Ge 6 O 15 were successfully synthesized by a high temperature solid state reaction. They obey the general formula of Li m A n M 6 O 15 (A=Rb, Cs; M=Si, Ge; m+n =6) and all exhibit the Sr 2 Be 2 B 2 O 7 (SBBO)-like structures. More importantly, Li 3 Rb 3 Ge 6 O 15 and Li 3 Cs 3 Ge 6 O 15 crystallize in the noncentrosymmetric (NCS) structures and exhibit remarkable phase-matched second harmonic generation (SHG) effect, 0.8×KH 2 PO 4 (KDP) and 1×KDP, respectively. These indicate that they are potential as UV or deep-UV NLO materials. Furthermore, their optical and NLO properties as well as thermal properties were measured. The structure-property relationships were studied by the dipole moment calculations and the first-principles calculations.
研究领域:
材料科学
·
无机化学
·
光学材料
·
固态化学
·
非线性光学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 10
·5130-5135
·
IF 3.708
Kunjie Wang,Yanping Wu,Hongxia Li,Mingliang Li,Deyi Zhang,Huixia Feng,Haiyan Fan
We developed a one-step synthesis method of N-acetyl-L-cysteine and glutathione reduced protected Ag nanoparticles powder, and present a thorough characterization of the synthesized nanoparticles. The morphology and surface properties of Ag nanoparticles were obtained by transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FT-IR), the optical properties and stability of these Ag nanoparticles in air were studied by UV-vis spectroscopy. In addition, the Ag nanoparticles protected by N-acetyl-L-cysteine and glutathione reduced are used to investigate their antimicrobial efficacy and mechanism against Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli, the antibacterial performance indicate that these Ag nanoparticles have superior stability and enhanced antibacterial activity compared to silver ions, it is believed that these Ag nanoparticles act as a promising antimicrobial material additive for practical applications.
研究领域:
纳米材料
·
微生物学
·
材料化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Shao-Min Wang,Fei Wang,Yong-Li Dong,Mohana Shivanna,Qiubing Dong,Xuan-Tong Mu,Jingui Duan,Qingyuan Yang,Michael J. Zaworotko,Qing-Yuan Yang
The separation of ethane (C 2 H 6 ) from ethylene (C 2 H 4 ) is one of the most challenging and important tasks in chemical industry. Herein we report two interpenetrated diamondoid ( dia ) coordination networks, Dia-4-M [M(pba) 2 ] (pba = 4-(4-pyridyl)benzoate); M = Ni or Co), that can directly capture ethane from ethane-ethylene mixtures with reverse C 2 H 6 /C 2 H 4 separation. Both materials not only exhibit ultra-high C 2 H 6 uptake (100 cm 3 g −1 for Dia-4-Ni ; 103 cm 3 g −1 for Dia-4-Co ) but also display good C 2 H 6 /C 2 H 4 selectivity (1.76 for Dia-4-Ni ; 2.04 for Dia-4-Co ). Such C 2 H 6 /C 2 H 4 separation performance was confirmed by dynamic breakthrough experiments. Dia-4-M could extract low concentrated of C 2 H 6 from C 2 H 6 /C 2 H 4 mixture (v(C 2 H 6 )/v(C 2 H 4 ) = 1:9 and 1:15) and produce high purity (99.9%) of C 2 H 4 under ambient conditions. The mechanism for selective C 2 H 6 /C 2 H 4 separation was clarified through Grand Canonical Monte Carlo (GCMC) simulations and Density functional theory (DFT) calculations. Overall, this research demonstrates that Dia-4-M has a significant potential as effective C 2 H 6 -selective adsorbents for the purification of ethylene in practice.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）