CHINESE CHEMICAL LETTERS
·
2016
·
IF 1.947
Adil Omar,Keyume Ablajan,Mawjvda Hamdulla
Novel fluorescent coumarin-4 H -pyran conjugates were achieved by three-component reactions of various synthetic β -ketoesters with aldehydes and malononitrile in aqueous media. Besides mild reaction conditions, operational simplicity, absence of tedious separation procedures, using of inexpensive and nontoxic commercially available cationic surfactant cetyltrimethylammonium chloride (CTAC) as a catalyst are the prominent advantage of this method.
研究领域:
有机化学
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药物化学
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DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2014
·Vol. 90
·期 4
·678-685
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IF 2.494
Xiaolian Jing,Dengpo Huang,Huimei Chen,Tareque Odoom-Wubah,Daohua Sun,Jiale Huang,Qingbiao Li
BACKGROUND The synthesis and application of novel Au nanostructures are of increasing importance in modern nanotechnology. RESULTS Closely packed and chemically difficult-to-synthesize Au nanohorns (AuNHs) were synthesized in the presence of Escherichia coli cells (ECCs) and hexadecyltrimethylammonium chloride (CTAC) by a microorganism-mediated, CTAC-directed (MCD) approach. A proper ECC dosage, ascorbic acid (AA) and CTAC concentrations were essential for the growth of the AuNHs. In the formation mechanism of the AuNHs the ECCs surface acted as a platform for preferential nucleation and initial anisotropic growth of Au nanocrystals. As a result, some of the adjacent nanoparticles over the cell surface connected together via linear fusion to form dendritic nanostructures. Meanwhile, secondary nucleation in the solution gave rise to smaller nanoparticles that were consumed later on via Ostwald ripening during the formation of the AuNHs. Eventually, the two-dimensional film-like nanostructures between adjacent cells easily connected to form well-defined AuNHs with three-dimensional nanostructures. Interestingly, the AuNH/ECC composites can be used directly as sensitive surface-enhanced Raman spectroscopy (SERS) substrates for effective detection of 4-mercaptobenzoic acid (MBA). CONCLUSION The MCD strategy was an effective approach to novel AuNHs and AuNH/microorganism nanocomposites as SERS substrate. © 2014 Society of Chemical Industry
研究领域:
纳米技术
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材料科学
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化学
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生物科学
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
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2024
·
IF 4.9
Xin-Ran Ma,Yi-Wen Wu,Qian-Xue Shen,Yan-Hua Jiao,Jun Cao,Li-Hong Ye
One-step admicelle to cyclodextrin sweeping (ACDS) method in capillary electrophoresis (CE) has been developed for the separation and preconcentration of toxic aristolochic acids (AAs) by applying cetyltrimethylammonium chloride (CTAC) between the critical micelle concentration and critical surface aggregation concentration. The analytes were captured into the CTAC admicelles, after the more stable inclusion complexes were formed, the release and preconcentration of the analytes could be realized. The CE enrichment parameters, such as the types of cationic surfactants and cyclodextrins (CDs), the concentration of cationic surfactants, disodium tetraborate decahydrate (borax) and CDs, the volume ratio of acetonitrile (ACN) in background electrolyte (BGE) and the sample injection time were optimized systemically. The optimal BGE was composed of 20 mM borax, 10 mM γ-CD and 10 % (v/v) ACN, the sample matrix consisted of 0.2 mM CTAC, 20 mM borax and five analytes. The limit of detection of this method was 3–6 ng/mL, and good linearity values (R 2 ) were obtained for five AAs in the range of 0.997–0.999. Applying optimized conditions, the enrichment efficiencies of five AAs were enhanced with the sensitivity enrichment factors of 30–68. The sweeping approach was successfully applied to the determination of A, B, Ⅶ a , C and D in Aristolochia and Asarum samples, which could provide a potential in the enrichment of the other toxic compounds.
研究领域:
分析化学
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毒理学
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DOI
高影响因子
Journal of Materials Chemistry C
·
2015
·Vol. 4
·期 3
·568-580
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IF 4.696
Fan Zhang,Jian Zhu,Hui-Qin An,Jian-Jun Li,Jun-Wu Zhao
In this work, a facile and effective two-step separation strategy that combined both CTAB and CTAC has been proposed that enables the purification of gold nanotriangles on a large scale. The resulting nanotriangles exhibit straight edges and sharp corners, with a narrower size distribution. The separation of size or morphology could be achieved by utilizing different surfactants. It was found that CTAB served as a size separation agent and CTAC served as a shape separation agent in the separation process. The optimum concentrations were found to be 0.167 M CTAB for size separation and 0.222 M CTAC for shape separation respectively. By simply adjusting the concentration and the sequence of CTAB and CTAC, we were able to exquisitely separate nanotriangles from the crude gold nanoparticles. Furthermore, the separation mechanism has also been discussed based on surfactant depletion-induced aggregation on different contact areas of the nanoparticles. The proposed two-step separation strategy holds great potential to be extended to the separation of other nanoparticles with anisotropic shapes and different sizes, improving the high yield of anisotropy with great uniformity, which will eventually facilitate SERS-based applications.
研究领域:
纳米技术
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材料科学
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DOI
高影响因子
Nano Research
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2021
·Vol. 15
·期 1
·446-451
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IF 8.897
Yu Yongsheng,He Lin,Xu Junjie,Li Jiaming,Jiang Sida,Han Guanghui,Jiang Baojiang,Lei Wenjuan,Yang Weiwei,Hou Yanglong
The ordered Pt-based intermetallic nanoparticles (NPs) with small size show superior magnetic or catalytic properties, but the synthesis of these NPs still remains a great challenge due to the requirement of high temperature annealing for the formation of the ordered phase, which usually leads to sintering of the NPs. Here, we report a simple approach to directly synthesize monodisperse ordered L1 0 -FePt NPs with average size 10.7 nm without further annealing or doping the third metal atoms, in which hexadecyltrimethylammonium chloride (CTAC) was found to be the key inducing agent for the thermodynamic growth of the Fe and Pt atoms into the ordered intermetallic structure in the synthetic process. In particular, 10.7 nm L1 0 -FePt NPs synthesized by the proper amount of CTAC show a coercivity of 3.15 kOe and saturation magnetization of 45 emu/g at room temperature. The current CTAC-assisted synthetic strategy makes it possible to deeply understand the formation of the ordered Pt-based intermetallic NP in solution phase synthesis.
研究领域:
材料科学
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纳米技术
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产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
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2024
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IF 6.7
Zhimin Li,Dongming He,Yimin Zhou,Zi-Yu Zhang,Zhongai Hu,Xiaoquan Lu
Nonylphenol (NP) is an important fine chemical raw material and intermediate that is widely utilized in industry and may be distributed in aquatic ecosystems. Following its entry into the food and water cycles, it can subsequently enter the human body and potentially harm the human reproductive system. For the purpose of monitoring NP in water, it is thus essential to build a straightforward, affordable, and robust electrochemical sensor. Based on a two-step chemical modification proceeding and an electrostatic self-assembly effect, a double-modified β-cyclodextrin functionalized multiwalled carbon nanotube sensor (HE-β-CD-CTAC/F-MWCNTs) has been successfully constructed. It incorporates the excellent host–guest interaction ability of β-cyclodextrin and the high chemical activity of cetyltrimethylammonium chloride (CTAC), and the carbon nanotubes have an enormous particular surface area and strong electrical conductivity. The electrochemical oxidation reaction of NP with the sensor is controlled by a surface adsorption process of equal numbers of protons and electrons. In accordance with the optimized experimental parameters, the limit of detection (LOD) for the sensor is 0.13 μM, and it responds linearly to NP in the concentration range of 1–200 μM. Meanwhile, the sensor has excellent repeatability, stability, and immunity to interference. For the detection of NP in real water samples, the sensor also showed an excellent recovery rate (92.8%–98.5%) and relative standard deviation (1.16%–3.26%).
研究领域:
环境科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Yifei Liu,Xu Guo,Mingwei Zhao,Chenwei Zou,Yeqing Feng,Yining Wu,Caili Dai
The effects of hydrophobic interaction and electrostatic interaction on the structure of zwitterionic wormlike micelles (WLMs) were studied. The change of the hydrocarbon chain length and addition of cetyl trimethyl ammonium chloride (CTAC) were employed to explore the effect of hydrophobic interaction and electrostatic interaction on the wormlike micelles constructed by zwitterionic viscoelastic surfactants and sodium p -toluene sulfonate (NaPts). The experimental results show that increasing hydrocarbon chain length of zwitterionic surfactant and the addition of CTAC can increase the viscoelasticity and zero-shear viscosity of the system. The calculated length of wormlike micelles also increases. This shows that the enhancement of hydrophobic interaction and electrostatic interaction can promote the growth and entanglement of wormlike micelles. In addition, scanning electron microscope (SEM) images confirmed that CTAC makes the connection between the zwitterionic micellar layer closer. This is undoubtedly beneficial to the growth of micellar structure . Finally, this work explores the enhancement mechanism of the hydrophobic interaction and electrostatic interaction on the micelle structure.
研究领域:
胶体化学
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表面活性剂科学
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产品关联
DOI
高影响因子
RSC Advances
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2016
·Vol. 6
·期 40
·33554-33560
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IF 3.289
Yuanfeng Pan,Zhengdong Zhang,Yang Li,Pingxiong Cai,Zhangfa Tong,Xiaobang Hou,Huining Xiao
Cationic nanoparticles with a core–shell structure and high zeta potential were prepared by two-step semi-batch emulsion polymerization and pre-emulsification technology using the cationic emulsifier hexadecyl trimethyl ammonium chloride (CTAC). The core–shell structure of the latex particles was confirmed by the TEM image and the change of mean particle size. Various influencing factors related to the adsorption of cationic latex on sugarcane fibres were investigated, including the time of adsorption, the concentration of latex, pH, temperature and ionic strength. The adsorption kinetics and thermodynamics were also studied. The obtained adsorption experimental data fit the Langmuir adsorption model well, and the maximum theoretical adsorption capacity of the nanoparticles on the sugarcane fibres reached 197.6 mg g−1. TGA analysis was used to further quantify the amount of adsorption. The water contact angle of the modified fibre was increased from 0° to 98°, compared with the untreated fibre, which indicates that the sugarcane fibres were rendered hydrophobic by the cationic nanoparticles.
研究领域:
材料科学
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化学工程
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表面化学
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高分子科学
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产品关联
DOI
高影响因子
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
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2025
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IF 3
Zhen-Ming Shen,Jie Liu,Kun-Peng Wang,Xi-Hao Zhang,Lan Chen,Zhigang Zhou,Tian-Song Deng
Hollow core-shell noble metallic nanoparticles have garnered significant attention due to their plasmonic properties, which are markedly enhanced by the hollow structure. However, precisely controlling the size and shape of the shell and cavity in such structures remains a challenge. Here, a novel strategy is reported that eliminates the need for etchants, utilizing monodispersed gold nanorods (AuNRs) as templates to synthesize hollow Au@AuAg core-shell nanostructures. By precisely regulating the CTAB/CTAC and Au/Ag ratios during the co-deposition of Au and Ag atoms onto the AuNRs, uniform bimetallic hollow shells are achieved without the use of corrosive etching agents. High-resolution TEM and EDS characterizations confirm the formation of crystalline AuAg alloy shells surrounding the AuNRs cores, with well-defined cavities. Compared to pure silver shells, the AuAg alloy shells exhibit superior stability. Furthermore, the resulting Au@AuAg nanostructures with hollow shells demonstrate significantly enhanced refractive index sensitivity and surface-enhanced Raman scattering (SERS) activity relative to pristine AuNRs, making them highly promising for biomedical applications such as biosensing and bioimaging.
研究领域:
纳米技术
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材料科学
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等离子体光子学
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分析化学
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生物医学工程
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Nannan Zhang,Kewang Zhang,Jie Li,Changqing Ye,Yukou Du
Three dimensional (3D) noble-metal nanomaterials with special surface structures have been regarded as high-performance catalysts for alcohol oxidation on account of their superior thermal stability, electrical conductivity and large specific surface area. Although extensive efforts have been devoted to the preparation of 3D Pd-based catalysts with superior activity and stability, designing a simple, effective and eco-friendly method remains a challenge. Herein, we developed a facile one-step coreduction strategy to synthesize a series of 3D surface-wrinkled PdAu nanospheres (NSs) with tunable Pd/Au atomic ratios and found a universal method to prepare surface-wrinkled PdM (M = Au, Pt, Cu and Pb) NSs. Benefiting from the function of the surfactant cetyltrimethylammonium chloride (CTAC), the synthesized PdAu NSs with different composition possess abundant surface wrinkles, which is beneficial for exposing more electroactive centers. Attributed to the unique geometric morphology and optimized atomic ratio, the PdAu-2 NSs exhibited an optimal mass activity (MA) of 8103 mA mg −1 and 5113 mA mg −1 for the ethylene glycol oxidation reaction (EGOR) and ethanol oxidation reaction (EOR), which was 6.1 and 4.1 times that of commercial Pd/C, respectively. Moreover, the PdAu-2 NSs exhibited superb stability after long-term current–time (i-t) and cyclic voltammetry (CV) tests of the EGOR and EOR. This work not only provides new avenues to engineer PdAu NSs with enhanced electrocatalytic performance but also offers guidance for extending to more 3D PdM (M = other metals) NSs with novel morphology applied to fuel cell fields.
研究领域:
材料科学
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纳米技术
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电化学
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催化
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Gao-feng Wu,Jian Zhu,Guo-jun Weng,Hao-yu Cai,Jian-jun Li,Jun-wu Zhao
In this work, Au@Ag core-shell nanoparticles with different size Au TNPs as the core were synthesized through seed-mediated growth method. Various types of Au TNP@Ag core-shell nanoparticles were easily prepared by varying the amounts of AgNO 3 using the CTAC as surfactant . We have further investigated their plasmonic properties of various types of Au TNP@Ag core-shell nanoparticles. Au TNP@Ag core-shell nanoparticles have tunable localized surface plasmon resonance properties which can be controlled by volumes of AgNO 3 . The absorption peak of Au TNP@Ag core-shell nanoparticles increased from one to five and the intensity gradually increased with the increase of the volume of AgNO 3 . Moreover, by changing the core size from 62 nm to 110 nm, the characteristic absorption of Au TNP@Ag core-shell nanoparticles could be shifted from visible to infrared range. Then we analyze the influence of halide ions on the shape formation of Au TNP@Ag core-shell nanoparticles. Au TNP@Ag triangular nanoprism, Au TNP@Ag nanocube and Au TNP@Ag right bipyramid only can be obtained in the in the presence of Cl - while not other halide ions (Br - , I - ). The adsorption of Cl - and oxidative etching of Cl - /O 2 lead to the formation of single crystal Au TNP@Ag nanocube and Au TNP@Ag right bipyramid with well-defined shaped Au TNP. The present work expanded the field of gold and silver core-shell nanoparticles. More importantly, a large number of new nanomaterials have been obtained and shows promising applications in optics and sensing.
研究领域:
纳米技术
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材料科学
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光学
·
传感
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
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2024
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IF 5.3
Er-Ji Zhang,Tian-Song Deng,Yu-Chun Cheng,Li-Yong Liu,Jia-Fei Gao,Jiahong Wen,Xiaoyu Zhao,Jie Liu
Plasmonic multimetal materials, consisting of a plasmonic core and a catalytic shell in a core–shell structure, often exhibit excellent catalytic performances. Such excellent performances arise from the synergistic collaboration between the plasmonic core’s localized surface plasmon-excited hot electrons and the catalytically active sites of the catalytic shell. In this context, a trimetallic nanostructure was designed featuring gold nanobipyramids (AuNBP) with a silver–platinum alloy shell, serving as a plasmon-mediated photocatalyst for the degradation of methyl orange (MO) under visible and near-infrared light. By altering the concentrations of the surfactants hexadecyltrimethylammonium bromide (CTAB) and hexadecyltrimethylammonium chloride (CTAC), the resulting nanostructure can take on either island-like or shell-like morphology. In the model system of the photocatalytic reaction of MO, employing the synthesized nanoparticles as catalysts, the study investigated the reaction under xenon lamp illumination. The trimetallic nanostructure exhibited robust photocatalytic performances, surpassing AuNBP by a factor of 27.8. The transfer of plasmon resonance energy from AuNBP to the silver–platinum alloy layer, augmenting the generation of charge carriers, elucidates its outstanding photocatalytic performance. The obtained trimetallic nanostructure showcases promising potential applications in the realm of photocatalysis, contributing to the development of advanced plasmon-enhanced photocatalysts with enhanced efficiency and multifunctionality.
研究领域:
纳米技术
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催化
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材料科学
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环境科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）