JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 136
·期 6
·47051
·
IF 1.901
Yongjun Guo,Rutong Song,Rusen Feng,Gang Dai,Yan Liang,Di Pu,Xinmin Zhang,Zhongbin Ye
A thermoresponsive graft copolymer was synthesized through free radical copolymerization and a “graft onto” method in aqueous solution. The primary structure of the graft copolymer is constituted of a partially hydrolyzed polyacrylamide (HPAM) backbone and thermosensitive side chains [amino-terminated poly( N , N -dimethylacrylamide- co -diacetone acrylamide) or P(DMA- co -DAAM)] with molecular weight around 10 5 g/mol. The 1 H-NMR spectra at various temperatures showed the temperature of thermoassociation ( T ass ) in the copolymer. At the same time, the pyrene fluorescence measurements demonstrated the formation of hydrophobic microdomains of P(DMA- co -DAAM) above T ass . The thermothickening behavior of the graft copolymers was studied by viscosity measurements, and the results suggested that in semidilute solutions, the T ass and the magnitude of thermothickening could be regulated by varying the hydrolysis degree of the backbone, the composition of side chains, and the addition of NaCl. The oscillatory shear experiments demonstrated that the copolymer can present a remarkable elasticity increase as the temerature increased to T ass . These thermoassociating copolymers with temperature-tunable properties can have potential applications as smart materials in enhanced oil recovery. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 135 , 47051.
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INORGANICA CHIMICA ACTA
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2015
·
IF 2.046
Li Liu,Changhua Liu,Ling Nie,Ting Jiang,Jing Hong,Xiaomei Zhang,Liehong Luo,Xiaolan Wang
A series of zirconium alkyl-N,N-dimethylenephosphonate silver-carrying (Ag-ZRDP) were successfully prepared and their potential applications as synergistic antibacterial materials were investigated. Silver nanoparticles (Ag NPs), of 30 nm in diameter, were tightly anchored onto the zirconium alkyl-N,N-dimethylenephosphonate (ZRDP), increasing the antibacterial activity of the Ag NPs due to a decrease in the extent of nanoparticle aggregation. Due to the synergistic antibacterial effect of the Ag NPs and ZRDP, the Ag-ZRDP showed a better antibacterial activity than Ag NPs and ZRDP with a minimal inhibition concentration (MIC) of 0.25 and 0.25 μg mL −1 against Escherichia coli and Staphylococcus aureus , respectively. Additionally, the Ag-ZRDP did not show obvious cytotoxicity against mammalian cells (A549 cells), even at a concentration of 256 μg mL −1 . Collectively, these properties make the newly synthesized Ag-ZRDP potentially superior as disinfectants and antiseptics for various biomedical and biotechnological applications.
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TETRAHEDRON
·
2020
·
IF 2.233
Zhen-Hua Li,Xiao-Meng Sun,Jin-Jing Qin,Zhi-Yong Tan,Wen-Biao Wang,Yao Ma
An efficient and divergent synthesis of N -arylbenzimidazoles and N -arylindazoles from arylamino oximes based on reaction conditions selection was developed. The synthesis was approached by treating oximes with BTC and the chemoselectivity was regulated by the amount of Et 3 N. This switchable N–N and N–C bond formation process features mild reaction conditions, simple execution, high chemoselectivity and broad substrate scope.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Yuelong Xu,Shasha Wang,Bin Ren,Junping Zhao,Lihui Zhang,Xiaoxi Dong,Zhenfa Liu
Carbon aerogels with excellent conductive characteristics and high specific capacitance have attracted more and more interests for next-generation energy storage applications. Three-dimensional interconnected Mn 2 O 3 /carbon aerogel supercapacitor electrodes are prepared by a novel doping method using MnO 2 coordinated by N, N-dimethylmethanamide (DMF). The coordinative MnO 2 (DMF/MnO 2 ) plays a key role in the sol-gel process of resorcinol and formaldehyde. The doped carbon aerogels exhibits a high specific surface area of 859 m 2 g −1 and a good pore-size distribution of 10–15 nm. All of the doped carbon aerogels exhibit higher specific capacitance than pure carbon aerogels, and the highest specific capacitance (170 F g −1 ), at current density of 1.0 A g −1 , is obtained in Mn–CA–5% when 5 mol% DMF/MnO 2 is added to the precursor solution. The specific capacitance is as high as 100 F g −1 , at current density of 10.0 A g −1 , and 97% of initial capacitance is retained over 1000 cycles at a current density of 5.0 A g −1 . The doped carbon aerogels exhibits a high coulombic efficiency (up to 99.8%) and a good rate capability. The corresponding result is due to the novel doping method of DMF/MnO 2 addition.
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DOI
PubMed
高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 12
·1015
·
IF 3.504
Liangfeng Zhang,Simin Liu,Yuhua Wang,Haijun Zhang,Feng Liang
A series of gold nanoparticles (AuNPs) was prepared in situ with different cucurbit[n]urils (CB[n]s) in an alkaline aqueous solution. The nanoparticle sizes can be well controlled by CB[n]s (n=5,6,7,8) with different ring sizes. The packing densities of CB[5–8] and free surface area on AuNPs were determined. A direct relationship was found between the ring size and packing density of CB[n]s with respect to the AuNP-catalyzed reduction of 4-nitrophenol in the presence of NaBH4. The larger particle size and higher surface coverage of bigger CB[n]-capped AuNPs significantly decreased the catalytic activity. Furthermore, this work could lead to new applications that utilize AuNPs under an overlayer of CB[n]s for catalysis, sensing, and drug delivery.Keywords:gold nanoparticles;cucurbit[n]urils;controllable synthesis;catalysis
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RSC Advances
·
2018
·Vol. 8
·期 20
·11061-11069
·
IF 2.936
Jin-Xin Che,Zhi-Long Wang,Xiao-Wu Dong,You-Hong Hu,Xin Xie,Yong-Zhou Hu
CXCR1 and CXCR2 are CXC chemokine receptors (CXCRs), corresponding to cytokines of the CXC chemokine family. CXCR2 was found to be 77% homologous to CXCR1. Antagonism of the chemokine receptor CXCR2 has been proposed as a new strategy for the treatment of metastatic cancer. In order to find a CXCR2 selective antagonist, a bicyclo[2.2.1]heptane containing N,N′-diarylsquaramide (compound 2e) was identified by introducing a bridge ring system into the N,N′-diarylsquaramide skeleton, and it exhibited good CXCR2 antagonistic activity (CXCR2IC50 = 48 nM) and good selectivity (CXCR1IC50/CXCR2IC50 = 60.4). Furthermore, an in vitro biological assay of compound 2e also demonstrated its good anti-cancer metastatic effect against the pancreatic cancer cell line CFPAC1. In addition, compound 2e showed an extremely high stability in simulated intestinal fluid (SIF) and simulated gastric fluid (SGF), as well as in rat and human plasma, but not in rat and human liver microsomes. In vivo pharmacokinetic studies in rats indicated that 2e has an excellent PK profile (10 mg kg−1 po, Cmax = 2863 ng mL−1, t1/2 = 2.58 h). Moreover, molecular docking was further implemented to propose the preponderant configuration of compound 2e, providing important and useful guidelines for further development.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Linlu Shen,Hongyi Wang,Jing Kang,Jimin Shen,Pengwei Yan,Yingxu Gong,Jiaxu Zhang,Gang Fu,Shuyu Wang,Yizhen Cheng,Shengxin Zhao,Zhonglin Chen
In this study, the ultraviolet/peroxymonosulfate (UV/PMS) process was found to be an efficient and safe strategy for simultaneously controlling NDMA during the degradation of N,N-dimethylhydrazine compounds, such as 1,1,1′,1′-Tetramethyl-4,4′-(methylene-di-p-phenylene) disemicarbazide (TMDS). The distinct roles of sulfate radicals (SO 4 − ), hydroxyl radicals (HO ), PMS, and UV in TMDS degradation as well as NDMA formation and elimination, have been elucidated, involving the kinetics and multiple-path transformation mechanisms. Moreover, to assess the feasibility of this process, a comprehensive toxicity assessment of treated water for zebrafish embryos was conducted. Mineralization analysis and an assessment of electrical energy per order (EE/O) were performed on actual water samples. The results indicate that SO 4 − , HO , PMS, and UV together degraded TMDS, but only SO 4 − and PMS led to NDMA formation. UV irradiation may coordinate SO 4 − and HO to overcome the energy barriers of NDMA elimination by providing continuous energy. The degradation of TMDS involved hydroxylation, radical addition, bond cleavage and nitrosation. Notably, NDMA formation may be closely related to the electron transfer between SO 4 − or PMS and TMDS. Subsequently, the generated NDMA was controlled through photocleavage, radical addition, and hydroxylation. Additionally, the results of toxicity evaluation and EE/O analysis suggest UV/PMS is safe and has the potential for treating N,N-dimethylhydrazine compounds-containing water.
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产品关联
DOI
高影响因子
Processes
·
2023
·Vol. 11
·期 4
·1137
·
IF 3.5
Junliang Wang,Zhenzhen Zhang,Quanyuan Wang,Tianhong Lou,Zhiyan Pan,Mian Hu
Understanding the solubility of CO2is critical for implementing CO2-enhanced oil recovery (CO2-EOR). In this work, the solubility of CO2inn-decane in a temperature range between 303.15 K and 353.15 K and pressures up to 15 MPa was measured using a fused silica capillary cell with in situ Raman spectroscopy. A semi-empirical CO2solubility prediction model was obtained according to the experimental results. In order to improve the solubility of CO2inn-decane, the solubility of CO2inn-decane and co-solventn-hexane (3% wt) mixture was also comparatively investigated. The results indicated that the solubility of CO2inn-decane was 1.6355~64.0084 mol/kg. The data from the prediction model were in good agreement with the experimental data, and the mean relative deviation was 3.65%, indicating that the prediction model could be used to predict the solubility of CO2inn-decane under different conditions. The solubility of CO2inn-decane +n-hexane system ranged from 1.0127 mol/kg to 65.7286 mol/kg. It was found that, under low-pressure conditions, the addition of co-solventn-hexane did not enhance the solubility of CO2, while it had a certain enhancement effect on the dissolution of CO2under high-pressure conditions. As the temperature increased from 303.15 K to 353.15 K, the enhancement efficiency of the solubility of CO2also increased from 1.34~2.05% to 8.17~9.82%, and the average enhancement efficiency increased from 1.74% to 9.00%. This study provides more CO2solubility data for CO2-EOR.Keywords:CO2solubility;n-decane;n-decane +n-hexane;Raman spectroscopy
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产品关联
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高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-15
·
IF 14.7
Liu Xixi,Huang Liang,Ma Yuandie,She Guoqiang,Zhou Peng,Zhu Liangfang,Zhang Zehui
A single-atom catalyst with generally regarded inert Zn–N 4 motifs derived from ZIF-8 is unexpectedly efficient for the activation of alcohols, enabling alcohol-mediated alkylation and transfer hydrogenation. C-alkylation of nitriles, ketones, alcohols, N -heterocycles, amides, keto acids, and esters, and N -alkylation of amines and amides all go smoothly with the developed method. Taking the α-alkylation of nitriles with alcohols as an example, the α-alkylation starts from the (1) nitrogen-doped carbon support catalyzed dehydrogenation of alcohols into aldehydes, which further condensed with nitriles to give vinyl nitriles, followed by (2) transfer hydrogenation of C=C bonds in vinyl nitriles on Zn–N 4 sites. The experimental results and DFT calculations reveal that the Lewis acidic Zn-N 4 sites promote step (2) by activating the alcohols. This is the first example of highly efficient single-atom catalysts for various organic transformations with biomass-derived alcohols as the alkylating reagents and hydrogen donors.
研究领域:
催化
·
有机化学
·
材料科学
·
化学工程
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PubMed
高影响因子
JOURNAL OF CATALYSIS
·
2023
·
IF 7.3
Zhijin Ge,Xin'ao Li,Hui Hu,Qingming Huang,Xiaohui Chen
The pure silicon MWW were synthesized for the first time by means of a dry-gel conversion method utilizing N, N, N-trimethyl-1-adamantyl ammonium hydroxide and hexamethyleneimine as the structural directing agents. A vapor transport assisted crystallization method for obtaining complete crystallinity was developed to replace the traditional dry-gel conversion methods. TiCl 4 acid solution treatment was cleverly used for the implantation of titanium in MWW. Compared with Ti-ERB-1, the Ti content of boron- free Ti-MWW is only 20% of the former, the conversion rate of 1-hexene epoxidation is 2.3 times of the former and nearly 100% of H 2 O 2 efficiency.
研究领域:
化学工程
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催化
·
材料科学
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Industrial Chemistry & Materials
·
2022
·Vol. 1
·期 2
·240-246
·
IF 0
Hui Cao,Mengyu Dou,Zexiang Lyu,Yingxiong Wang,Christian Marcus Pedersen,Yan Qiao
Carbazole and anthracene, two aromatic hydrocarbon components contained in coal tar, are used as essential organic intermediates to synthesize various carbazole derivatives and anthraquinones. N,N-Dimethylformamide (DMF) is a commonly used solvent to extract carbazole from crude mixtures of carbazole and anthracene. However, the interaction between carbazole/anthracene and DMF in the extraction process is still to be fully understood at the molecular level. In this work, the intermolecular interaction of carbazole/anthracene with DMF was investigated using various NMR techniques, including 1H NMR titration, variable temperature NMR spectroscopy (VT-NMR), Nuclear Overhauser Effect Spectroscopy (NOESY), and diffusion-ordered spectroscopy (DOSY). The observed 1H chemical shift changes of carbazole indicated strong intermolecular hydrogen bonds between carbazole and DMF, which was further supported by the decrease in the molecular self-diffusion coefficients (D) of both carbazole and DMF according to DOSY measurements. Moreover, NOESY experiments revealed that the distance between the aldehydic hydrogen of DMF and the N–H of carbazole was smaller than 5 Å. Accordingly, an intermolecular hydrogen bond between carbazole and DMF in the form of CO⋯H–N was proposed. This research increases our knowledge about the separation process of carbazole and anthracene and hence helps improve the methods.
Keywords: NMR; Carbazole; Separation; Intermolecular hydrogen bonds.
研究领域:
化学
·
有机化学
·
分析化学
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Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 21
·5663-5672
·
IF 7.779
Qixuan Qin,Asu Li,Yizhuo Fan,Xindong Zhang
In this work, Au nanoparticle-loaded ZnO/ZnFe2O4 (Au-ZnO/ZnFe2O4) microspheres were prepared using a combination of a two-step hydrothermal process and a co-precipitation method. The SEM and TEM analyses showed that the synthesized Au-ZnO/ZnFe2O4 samples were microspheres with a yolk–shell structure assembled from nanosheets. Gas-sensitive performance tests indicated that Au-ZnO/ZnFe2O4 showed the highest response to 100 ppm acetone (18.18), higher than those of ZnFe2O4 (8.4) and ZnO/ZnFe2O4 (11.6). In addition, the optimum operating temperature of Au-ZnO/ZnFe2O4 decreased from 279 to 206 °C compared to ZnFe2O4 and ZnO/ZnFe2O4. In addition, Au-ZnO/ZnFe2O4 yolk–shell microspheres exhibited fast response and recovery times (4 and 23 s, respectively). The sensor has a lower limit of acetone detection (0.7 ppm) at 85% RH and is able to effectively differentiate diabetic patients from healthy subjects by detecting acetone in their exhaled breath. The enhanced response of Au-ZnO/ZnFe2O4-based sensor is attributed not only to its high specific surface area but also to the synergistic effect of the n–n heterojunction structure of ZnO-ZnFe2O4 and the catalysis of Au nanoparticles.
研究领域:
材料科学
·
医学诊断
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