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
研究领域:
化学
·
材料科学
·
催化
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2013
·Vol. 160
·期 11
·H787
·
IF 2.588
Mi Ouyang,Zhiyan Fu,Xiaojing Lv,Bin Hu,Pingjing Wang,Senbiao Huang,Yuyu Dai,Cheng Zhang
Copolymer based on 4-(9H-carbazol-9-yl)-N,N-diphenylaniline (CDPN) and 3,4-ethylenedioxythiophene (EDOT) was electrochemically synthesized and characterized. Through electrochemical methods, FTIR spectroscopy and scanning electron microscopy (SEM) analysis, the resulting polymer was confirmed to be a copolymer rather than a blend or a composite of the respective homopolymers. Besides, the spectroelectrochemical and electrochromic properties of the copolymer (P(CDPN-co-EDOT)) films were investigated. According to the spectroelectrochemical analysis, the copolymer film revealed distinct electrochromic properties with four colors: claret red, green, cadetblue, and blue. At the neutral state of the copolymer, the π-π* transition absorption peak was located at 530 nm and the energy gap was calculated as 1.67 eV. The copolymer film showed a maximum optical contrast (ΔT%) of 36% in visible region with a switching time of 1.8 s and 43% in the near-IR region with a switching time of 2.5 s. The coloration efficiency (CE) of P(CDPN-co-EDOT) were calculated to be 332 cm2·C−1 (at 530 nm), 277 cm2·C−1 (at 810 nm) and 552 cm2·C−1 (at 1100 nm). Repeated cyclic voltammograms indicated that the copolymer had reasonable stability because of the existence of EDOT units.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 20
·12663-12671
·
IF 4.036
Shou-Jie Shen,Le-Mei Wang,Guo-Mei Gong,Yan-Jiao Wang,Jin-Yan Liang,Jun-Wen Wang
An N-addition reaction between imides and propargyl sulfonium salts was developed to afford sulfur-containing N-vinylimides with moderate to excellent yields. Under the activation of NaOAc·3H2O, imides could undergo deprotonation and propargyl sulfonium salts could isomerize to allenic sulfonium salts. The N-nucleophilic attack initiates the reaction and gives the desired products. Various imides, including arylimides, aliphatic imides and N-(arylsulfonyl) alkyl acylamides, and even bioactive saccharin, thalidomide and pomalidomide could provide organosulfur N-vinylimides compounds. The simple, mild and metal-free reaction conditions, the broad scope of substrates, gram-scale synthesis and convenient transformation embody the synthetic superiority of this process.
研究领域:
有机化学
·
药物化学
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2012
·
IF 4.555
Tao Li,Haoyue Xie,Zhifeng Fu
A facile, sensitive and universal method was established for analysis of biogenic amines using micellar electrokinetic chromatography coupled with chemiluminescent (CL) detection. It was found that diperiodatocuprate (III) (K 5 [Cu(HIO 6 ) 2 ], DPC), a transition metal chelate at unstable high oxidation state, could effectively enhance the reaction between luminol-type compound and hydrogen peroxide, to produce very strong CL signal. In addition, triethylamine was found to be able to effectively improve the yield of the derivatization reaction between biogenic amines and a luminol-type derivatization reagent, N -(4-aminobutyl)- N -ethylisoluminol (ABEI). Based on these facts, three biogenic amines were pre-column derivatized with ABEI, and post-column detected using high sensitive luminol-hydrogen peroxide-DPC CL system. Since the background was quite low, and the signal was quite strong, a considerable improved sensitivity was obtained. The presented method had been successfully applied to simultaneously analyze glycine, proline and phenylalanine with the detection limits (S/N = 3) of 0.030 μmol L −1 , 0.23 μmol L −1 and 0.21 μmol L −1 , respectively. To evaluate its potential application value, glycine in saliva and urine samples was detected using this method, and satisfied results were obtained. This approach can be further extended to detection of many other compounds such as peptides and drugs by using luminol-type derivatization reagent.
研究领域:
分析化学
·
生物化学
✓ 已验证
DOI
PubMed
高影响因子
ChemPlusChem
·
2020
·Vol. 85
·期 3
·503-509
·
IF 2.753
Meng-Yao Chao,Jing Chen,Xiao-Yu Wu,Rui-Yao Wang,Pei-Pei Wang,Lifeng Ding,David J. Young,Wen-Hua Zhang
Graphical Flexible friend : A metal–organic framework sustained by a Cd 5 cluster shows flexible behavior and coordination preference toward electron-deficient rather than electron-rich pyridyl ligands. Density functional theory calculations offer binding energies of the electron-deficient 4-pyridinealdehyde (1.09 eV) and 4-acetylpyridine (1.36 eV) to the flanking Cd centers, and are larger than those of the electron-rich ligands, such as 4-iodopyridine (0.32 eV) and 4,4′-bipyridine (0.61 eV). A cationic three-dimensional (3D) metal-organic framework (MOF) sustained by an N , N ′-diethylformamide (DEF)-solvated zigzag-shaped Cd 5 cluster secondary building unit (SBU), [Et 2 NH 2 ] 2 [Cd 5 (BTB) 4 (DEF) 2 ] ⋅ 4.75DEF ( 1 a , H 3 BTB=benzene-1,3,5-tribenzoic acid) shows flexible framework behavior and undergoes solvate exchange with CHCl 3 to yield [Et 2 NH 2 ] 2 [Cd 5 (BTB) 4 (DEF) 2 ] ⋅ x CHCl 3 ( 1 b ) accompanied by changes to pore sizes and shapes. Unexpectedly, the DEF solvates coordinated to the central Cd 2+ could not be replaced by strongly donor pyridyl and dipyridyl ligands. Additionally, more electron-deficient pyridyls preferentially coordinated to the flanking Cd 2+ of the Cd 5 SBU, as exemplified by [Et 2 NH 2 ] 2 [Cd 5 (BTB) 4 (DEF) 2 (PyCHO) 2 ] ⋅ x Sol ( 2 a , PyCHO=4-pyridinealdehyde) and [Et 2 NH 2 ] 2 [Cd 5 (BTB) 4 (DEF) 2 (PyAc) 2 ] ⋅ x Sol ( 2 b , PyAc=4-acetylpyridine). Density functional theory (DFT) calculations were used to understand these counterintuitive observations.
研究领域:
材料科学
·
无机化学
·
理论化学
✓ 已验证
DOI
高影响因子
TETRAHEDRON
·
2017
·
IF 2.651
Qiujie Tang,Ping Xie,Jin Wang,Jiajun Lin,Chunlai Feng,Charles U. Pittman,Aihua Zhou
Two cascade coupling reactions were developed between N -alkyl(aryl)- N -methacryloyl benzamides and readily available benzyl alcohols or sodium benzenesulfinates . Through a radical cyclization strategy, these one-pot sequential reactions provided two simple and efficient approaches to the synthesis of a variety of isoquinoline-1,3(2H,4H)-dione derivatives in high yields with a broad substrate scope. These compounds are valuable molecules in drug discovery .
研究领域:
有机化学
·
药物化学
✓ 已验证
DOI
高影响因子
International Journal of Polymer Science
·
2018
·
IF 1.718
Wenwen Yu,Lijing Zhu,Jiangao Shi,Cunting Zhao
Poly(lactic acid)-block-poly(N,N-dimethylaminoethyl methacrylate) (PLA-PDMAEMA) copolymers were synthesized from aminolyzed PLA via reversible addition fragmentation (RAFT) polymerization. PLA undergoes aminolytic degradation with ethylenediamine (EDA). The kinetics of the aminolysis reaction of PLA at different temperatures and EDA concentrations was investigated in detail. The molar masses of products rapidly decreased in the initial stage at low aminolytic degree. Meanwhile, reactive –NH2 and –OH groups were introduced to the end of shorter PLA chains and used as sites to further immobilize the RAFT agent. PLA-PDMAEMA block copolymers were synthesized. A pseudo-first-order reaction kinetics was observed for the RAFT polymerization of PDMAEMA at a low conversion. By controlling the aminolysis reaction of PLA and RAFT polymerization degree of DMAEMA, the length distributions of the PLA and PDMAEMA blocks can be controlled. This method can be extended to more systems to obtain block copolymers with controllable block structure.
研究领域:
高分子化学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Hui Shao,Bingqiao Yang,Huihua Luo,Ruiqi Ge,Jie Wu
In this study, N-OSS combined with DDA was examined as an novel collector. The collecting performances and their synergetic interaction mechanisms were investigated comprehensively. The micro-flotation results illustrated N-OSS/DDA exhibited excellent selectivity on separation without pre-activation. Contact angle tests revealed N-OSS/DDA could selectively enhance the hydrophobicity of spodumene, whereas, they barely affected that of albite. FTIR, SEM-EDS and Zeta potential revealed N-OSS/DDA might co-adsorb on spodumene surface rather than that of albite. XPS analysis and DFT calculations inferred the O 1 2p orbitals of -COO- within N-OSS could bond with Al 3s orbitals and the -NH 3 + groups of DDA adsorbed onto spodumene surface via hydrogen bonding and electrostatic attraction. Meanwhile, the hydrogen bonding between N-OSS and DDA promoted the co-adsorption on spodumene surface. While N-OSS/DDA weakly adsorbed on albite surface through physical adsorption. N-OSS/DDA exhibited outstanding floatability, which maybe a good substitute for conventional collectors in future.
研究领域:
矿物加工工程
·
表面化学
✓ 已验证
DOI
高影响因子
POLYMER
·
2015
·
IF 3.562
Xue Jiang,Chun Feng,Guolin Lu,Xiaoyu Huang
A homopolymer strategy was developed to synthesize temperature and pH/CO 2 stimulus-responsive homopolymers. A new class of acrylamide monomers bearing oligo(ethylene glycol) unit and N,N -diethylaminoethyl group were designed and prepared through Aza-Michael addition reaction followed by amidation with acryloyl chloride using amino group as a linkage to connect oligo(ethylene glycol), N,N -diethylaminoethyl, and polymerizable double bond groups together. Subsequently, the corresponding homopolymers containing oligo(ethylene glycol) unit and N,N -diethylaminoethyl group in each repeated unit were prepared via RAFT polymerization with controlled molecular weights and relatively narrow molecular weight distributions . The lower critical solution temperature (LCST) of homopolymer was examined to be influenced by molecular weight, salt concentration, and pH value of aqueous solution. The LCSTs of homopolymers could be tuned in a wide temperature window by changing pH value of aqueous solution and it increased with the decrease of pH value. Particularly, CO 2 gas as a unique pH stimulus can also reversibly adjust the solubility of homopolymer without the addition of acids or bases.
研究领域:
高分子化学
·
智能材料
·
药物递送
·
生物医用材料
·
刺激响应材料
✓ 已验证
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 2
·325
·
IF 3.1
Peng-Xiang Guo,Xin-Gang Wang,Mao-Qian Yang,Jian-Xin Wang,Fan-Jun Meng
With the advancement of industrial economies, incidents involving spills of petroleum products have become increasingly frequent. The resulting pollutants pose significant threats to air, water, soil, plant and animal survival, as well as human health. In this study, microcrystalline cellulose served as the matrix and benzoyl peroxide (BPO) as the initiator, while butyl acrylate (BA) andN,N′-methylene bisacrylamide (MBA) were employed as graft monomers. Through free radical graft polymerization, cellulose-graft-poly(butyl acrylate-N,N′-methylene bisacrylamide) [Cell-g-P(BA-MBA)], possessing oil-adsorbing properties, was synthesized. The chemical structure, elemental composition, surface morphology and wetting properties of the graft polymerization products have been characterized, using infrared spectroscopy, elemental analysis, scanning electron microscopy and contact angle testing. The adsorption properties of Cell-g-P(BA-MBA) for various organic solvents and oils were then assessed. The experimental results demonstrated that Cell-g-P(BA-MBA) exhibited a maximum adsorption capacity of 37.55 g/g for trichloromethane. Adsorption kinetics experiments indicated a spontaneous and exothermic process involving physical adsorption, conforming to the Freundlich isotherm model. Furthermore, adsorption kinetics experiments revealed that Cell-g-P(BA-MBA) displayed favorable reuse and regeneration performance, maintaining its adsorption capacity essentially unchanged over fifteen adsorption–desorption cycles.
研究领域:
材料科学
·
环境科学
·
高分子化学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2024
·
IF 2.8
Boyun Gao,Huijiang Huang,Mooeez Ur Rehman,Bin Ren,Yuruo Liu,Weipeng Fan,Pengfei Li,Lizhi Zhang,Yan Xu,Yujun Zhao
BACKGROUND The synthesis of fatty amines via fatty alcohol amination offers a promising avenue for environmentally friendly production, particularly when compared with the methods employing hydrocyanic acid which often involve significant emissions. RESULT This study explores the synthesis of n-hexylamine through one-step amination of n-hexanol utilizing a series of Ru-doped Ni catalysts supported over γ-Al 2 O 3 , achieving 61% n-hexanol yield, 35% dihylamine yield and 3.5% trihylamine yield at the n-hexanol conversion of 99%. CONCLUSION The characterization results of the catalysts revealed a significant interaction between ruthenium and nickel in the bimetallic catalysts, leading to the enhanced reducibility of Ni species and improved metal dispersion. Moreover, ruthenium species were found to play an important role in the dissociation of NH 3 into NH x (x = 1, 2), thereby significantly improving the dehydrogenation process of n-hexanol at Ni sites. The synergistic effect between the two kinds of metal sites emerges as crucial factor for the boosted alcohols amination process. © 2024 Society of Chemical Industry (SCI).
研究领域:
催化化学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2020
·
IF 2.888
Taotao Zhan,Yuqi Su,Ying Zhang,Xiangyang Liu,Maogang He
The mutual diffusion coefficients of ethanol + n-heptane and diethyl carbonate (DEC) + n-heptane binary solutions were measured over the mass fraction from 0.05 to 0.95 at the pressure of 0.101 MPa, and at temperatures T = 288.15 K, 298.15 K, 308.15 K and 318.15 K. The expanded relative uncertainty ( k = 2) of the Mach-Zehnder digital holographic interferometry employed in the measurements was estimated to be less than 2.4% with the confidence level of 0.95. A semi-empirical correlation was used to fit the mutual diffusion coefficients as a function of concentration and temperature, which represents the experimental values with the absolute average relative deviations being 0.94% for ethanol + n-heptane and 0.90% for DEC + n-heptane. The temperature and concentration dependences of the mutual diffusion coefficients were investigated. The strongest non-ideal thermodynamic behaviors appear when the mass fraction of ethanol is within the limits of 0.45 to 0.65 or that of DEC is within the limits of 0.45 to 0.65. Besides, the mutual diffusion coefficients of ethanol + n-heptane and DEC + n-heptane binary solutions are found to be extremely sensitive to the solute concentration over the mass fraction of ethanol and DEC from 0.00 to 0.05, respectively.
研究领域:
物理化学
·
热力学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）