Journal of Biomedical Research
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2018
·
IF 0
Mei-qing Sun,Zhan-lin Ding,Hong Wang,Guang-ping Yu,Li,Ming-chun Li,Meng-meng Zhen
BiOBr nanosheets are important photocatalytic nanomaterials. However, their biological effects remain to be explored. In this study, we investigated the antifungal effect of BiOBr nanosheets on Candida albicans . Strikingly, the nanosheets strongly inhibited the growth of C. albicans [IC 50 =(96±4.7) mg/L], hyphal development and biofilm formation. Compareed to the antifungal effect of the cationic surfactant cetyltrimethylammonium bromide, the inhibitory effect of the nanosheets on fungal pathogen was attributed to cetyltrimethylammonium bromide adsorbed by the nanosheets. Thermal gravity analysis and cetyltrimethylammonium bromide release experiment indicated that only 0.42% cetyltrimethylammonium bromide on BiOBr nanosheets was released. Taken together, this study uncovers the contribution of surfactant released from the nanosheets to their antifungal activity.
研究领域:
微生物学
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纳米医学
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药物递送
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DOI
PubMed
Journal of Physical Chemistry C
·
2018
·
IF 4.484
Ying-Ying Wang,Xun Xiang,Ren Yan,Yi Liu,Feng-Lei Jiang
Förster resonance energy transfer (FRET) has attracted much attention for its wide applications in the fields of bioimaging, bioanalysis, etc. One of the critical problems in FRET is the construction of suitable donor–acceptor pair. The fluorescent quantum dots (QDs) can well meet the requirements both for a donor and an acceptor, owing to their tunable emission and broad absorption. Besides, the QDs possess high quantum yield, which highly benefits the FRET efficiency. In this work, glutathione-capped CdTe QDs (GSH-CdTe QDs) was chosen as the energy donor (D) and Rhodamine B (RhB) as the energy acceptor (A). However, no FRET occurred when there were only QDs and RhB, even though there was much overlap between the absorption spectrum of RhB and the emission spectrum of QDs. Interestingly, after the addition of a cationic surfactant, cetyltrimethylammonium bromide (CTAB), FRET was induced favorably. Further understanding of this phenomenon was studied by fluorescence spectroscopy, dynamic light scattering, and zeta potential. The results indicated that QDs aggregated and were cross-linked by CTAB due to electrostatic interactions. Then, RhB was trapped in the aggregates. Therefore, QDs and RhB were pulled closer to a reasonable distance and FRET happened prosperously. Notably, thermodynamics in this process was well studied for an in-depth understanding. This work will render the better design of donor–acceptor pairs to overcome the long distances as well as the deep understanding of FRET with spreading applications.
研究领域:
生物成像
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生物分析
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物理化学
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DOI
高影响因子
CRYSTENGCOMM
·
2013
·Vol. 16
·期 10
·1859-1863
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IF 3.879
Peiyu Qiu,Na Zhou,Yongnan Wang,Chunlei Zhang,Qing Wang,Rongjin Sun,Guo Gao,Daxiang Cui
Herein we report a novel cationic surfactant-assisted hydrothermal method to synthesize highly dispersed LuF3 upconversion nanoparticles (80–100 nm) and Na1.5Y2.5F9 flower-like assemblies (450–550 nm). Controlling the initial shape of the building blocks, growth oriented by the cationic surfactant and Ostwald ripening are deemed as the possible formation processes in the hydrothermal system.
研究领域:
材料科学
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纳米技术
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DOI
高影响因子
LANGMUIR
·
2019
·
IF 3.683
Jinjin Li,Jianfeng Li,Liang Jiang,Xinchun Chen,Jianbin Luo
It is easy to achieve extremely low friction of graphene or graphite in dry conditions via the formation of an incommensurate interface but is difficult to achieve with water lubrication. Herein, we propose a new strategy to achieve extremely low friction on a graphitic surface in water by self-assembling cationic surfactant micelles in the contact zone. When uniform surfactant micelles are formed on silica and freshly cleaved graphene layers via self-assembly under low contact pressure, the friction coefficient between them can reduce to 0.0004. When the self-assembled micelles are ruptured in the contact zone by high pressure, the friction coefficient between them would increase to 0.005 (still in the superlubricity regime). The mechanism of the different friction behaviors was studied at the nanoscale, which was attributed to the formation of different shear planes that shifts from the interface of the micelle/micelle to surfactant molecules/graphene layers after micellar rupture. The results provide direct evidence that the cationic surfactant micelles can efficiently lubricate graphitic surface regardless of micellar rupture.
研究领域:
材料科学
·
表面科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2015
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IF 2.723
Wenzhe Song,Taihong Shi,Di Yang,Jinpeng Ye,Yi Zhou,Yuxiang Feng
Adsorption of Cr(VI) onto different pretreated zeolites modified with cetylpyridinium chloride (CPC) is investigated using batch studies, Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) measurements and scanning electron microscopy (SEM). The results indicate that acidification after alkalization is the most effective pretreatment method, and only alkalization would significantly reduce the sorption capability. This behavior is due to the precipitates, such as CaCO 3 and MgCO 3 , generated after alkalization on zeolite surface interfere the formation of the CPC bilayer, which provides active sites for sorbing Cr(VI). The schematic of the adsorption mechanism is presented. The results indicate that developing a better understanding of the influence of different pretreatments is quite helpful and suggest that the content of Ca/Mg/Fe could be a good indication of the effectiveness of preprocessing.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Desalination and Water Treatment
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2016
·
IF 1.272
Fengxiao Ren,Randi Zhang,Wenzhan Lu,Tong Zhou,Runping Han,Shusheng Zhang
It is essential and important to remove chlorophenols from solution. The natural phoenix tree leaf (NTL) was modified by a cationic surfactant, hexadecylpyridinium chloride monohydrate (CPC), and applied as an adsorbent (modified phoenix trees’ leaf (MTL)) to enhance the capability to remove 2,4-dichlorophenol in aqueous solutions. Analysis of elemental composition, SEM and FTIR indicated that CPC was adsorbed on the surface of NTL. 2,4-dichlorophenol (2,4-DCP) was selected as adsorbate and the adsorption experiments were carried out in batch mode. Effects of physical–chemical parameters such as solution pH, coexisted salt, and contact temperature were investigated. The optimum pH was 6.3 and the effect of salt concentration is not significant. The adsorption quantity was up to 188.8 mg g−1 at experimental condition. The equilibrium adsorption data were fitted adequately to Freundlich and Henry isotherms, and the corresponding constants were calculated for these models. In addition, the adsorption kinetic data were analyzed using the pseudo-first-order and pseudo-second-order kinetic equations. The results showed that the pseudo-second-order model was better to fit the experimental data, which indicated that the adsorption of 2,4-DCP was controlled predominantly by a chemical adsorption process. Thermodynamic study suggested that the adsorption of 2,4-DCP on CPC–MTL was an endothermic process. Furthermore, the adsorbed 2,4-DCP was desorbed effectively up to 83% and the exhausted adsorbent could be regenerated and reused, making the adsorption process more feasible and economical. The results indicated that MTL can be used as an efficient adsorbent for the removal of 2,4-DCP from aqueous solutions.
研究领域:
环境科学
·
化学工程
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DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2023
·Vol. 234
·期 8
·1-18
·
IF 2.9
Yan Lianpeng,Zhou Keming,Zhang Rui,Zhu Xuedong
In this study, Medulla tetrapanacis (MT), a kind of herbaceous plant, was modified by phosphoric acid (H 3 PO 4 ) and cetyltrimethylammonium bromide (CTAB) to obtain the adsorbent MT-H 3 PO 4 -CTAB. It could quickly and efficiently remove the anionic azo dyes, Congo Red (CR) and Ponceau S (Po.S), from solution. For 500 mg/L CR and 150 mg/L Po.S dye solution, the removal efficiency could reach 84.52% and 95.29% within 10 min, and the maximum adsorption capacities of MT-H 3 PO 4 -CTAB towards CR and Po.S were 719.42 mg/g and 230.94 mg/g at 303 K, respectively. The effects of initial pH of the solution, temperature, initial dye concentration, and contact time were optimized. The adsorption process followed the pseudo-second-order kinetic model, and the equilibrium adsorption data fitted the Langmuir isotherm well. Moreover, thermodynamic studies indicated that the adsorption of two anionic azo dyes was spontaneous. The adsorption of CR onto MT-H 3 PO 4 -CTAB was endothermic while the adsorption of Po.S was exothermic. Molecular interactions, such as electrostatic attraction and hydrogen bonding between dyes molecules and adsorbent, play an important role in the adsorption process. This study demonstrates that acid-activated and surfactant-modified herbaceous plant adsorbent has a simple preparation process and exhibits excellent adsorption properties for anionic azo dyes, which could extend the potential applicability for biomass.
研究领域:
环境科学
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植物学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Qin Chen,Yin Zhao,Zhaolin Yang,Rao Guo,Siqi Huan,Baobin Wang,Guihua Yang
Lignin, a byproduct of the paper and pulp industry, shows promise as stabilizers for emulsions, offering potential value-added applications to direct disposal. However, utilizing particulate lignin directly as stabilizers is challenging due to limited emulsion stability. In this study, co-stabilization of Pickering emulsions is investigated by combination of lignin particles and cationic surfactants (CTAB and DDAB), wherein lignin source and oil types are optimized with a focus on emulsion stability. A battery of characterization methods, including visual appearance, microstructure, droplet size, zeta potential, etc., is employed to evaluate emulsion stability. The findings reveal that kraft lignin nanospheres (LNS) are the optimal stabilizing particles. The incorporation of cationic surfactants via electrostatic adsorption enhances the stabilizing effect of LNS, and the use of DDAB is found to significantly enhance emulsion stability compared to CTAB, attributing to higher charge shielding capability of DDAB, as well as the formation of a more robust and compact nonpolar anchoring layer. The surfactant-assisted LNS can be used to stabilize a range of oil types, with tridecane as the optimal oil. This research presents a straightforward, efficient, and scalable approach for producing highly stable lignin-based Pickering emulsions, showing potential applications in recycling and value enhancement of waste lignin.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2025
·
IF 2.3
Zhang Wenlong,Zhang Qi,Xia Tianbao,Ji Qiuhan,Liu Jiefan,Liu Xingwen,Wang Lan,Wang Longyao
A viscoelastic surfactant ( VES ) clean fracturing fluid is an excellent alternative to polymer-based fracturing fluids for fracturing low-permeability reservoirs. However, the existing VES either has poor salt resistance or involve complicated preparation steps. Herein, a cationic Gemini VES with high salt tolerance, named neopentanediol di-(erucamide propyl ammonium bromide) ( NEPB ), was synthesized through a one-step reaction to simplify the process, using erucamide propyl dimethylamine and pentaerythritol dibromide dissolved in DMF . The double hydroxyl groups on the spacer imparts NEPB superior salt tolerance to the Gemini VES with a single hydroxyl ( JS-(OH)-JS ). Salinity-sensitive evaluation experiments consisting of salinity cloud point, DLS , and fluorescent probe tests; rheological experiments including apparent viscosity, viscoelasticity, and heat and shear resistance measurement; and comprehensive tests of fracturing fluids such as proppant suspending, gel-breaking, and core damage rate were carried out to study the performance of NEPB used in a fracturing fluid. The apparent viscosity of 3 wt% NEPB solution rises to the peak value at the NaCl concentration of 5 wt%, much higher than that of the JS-(OH)-JS solution. Oscillatory measurements exhibit that the NEPB solution with the peak apparent viscosity exhibits superior viscoelasticity to the JS-(OH)-JS solution, and the relaxation time and the plateau of the storage moduli are 17.69 s and 53.71 Pa. And the NEPB VES fracturing fluids prepared by the simulated seawater of the South China Sea, with NaSal added, exhibits best heat and shear resistance, and the remain viscosity is above 40 mPa·s. Settling velocity proppant in the NEPB VES fracturing fluid with NaSal added is 1.22 mm/s. Ethylene glycol butyl ether exhibits a superior gel-breaking performance to crude oil, and the insoluble residues of the ethylene glycol butyl ether gel-breaking fluids are all below 3 mg/L. The development of NEPB not only simplifies the preparation course of VES but also improve the salt tolerance of cationic Gemini VES , which is meaningful to the development of low-permeability oil and gas reservoirs offshore. Graphical
研究领域:
石油工程
·
化学工程
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DOI
高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2017
·Vol. 35
·期 2
·557-566
·
IF 2.007
Sun Zhonghai,Wu Zhansheng,Liu Dandan,He Xiufang
Polycyclic aromatic hydrocarbons (PAHs) are toxic pollutants harmful to humans. To improve the adsorption capacity of PAHs on activated carbon (AC) from the aqueous system, AC was modified with cationic surfactants through microwave heating. Naphthalene is a typical PAH used as a model pollutant to test the adsorption properties of sample; the sample with the best adsorption performance was named SAC. The SAC was characterized by SEM, FTIR and BET in detail compared with AC. The specific surface area and the average pore size of SAC increased by nearly 100 m 2 g −1 and 0.14 nm more than the original AC, respectively. The adsorption experiment was carried out by batch technique with variables such as contact time, adsorbent amount, pH and temperature. Results showed that naphthalene was adsorbed rapidly during the first 20 min, and thereafter reached adsorption equilibrium in 40 min. The adsorption kinetics of naphthalene on SAC can be well described by the pseudo-second-order model and the Freundlich isotherm model better fitted the adsorption isotherms of naphthalene on SAC. Naphthalene adsorption process on SAC was spontaneous and temperature was found to negatively affect the adsorption capacity. Furthermore, film diffusion was confirmed the rate limiting step. The π - π stacking electron donor acceptor interaction, hydrophobic interaction and hydrogen bonding may play more key roles in naphthalene adsorption on SAC than AC. Thus, microwave-assisted surfactants modification was proven to be an effective method to enhance the adsorption of naphthalene onto SAC from aqueous solution.
研究领域:
环境科学
·
化学工程
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产品关联
DOI
高影响因子
LANGMUIR
·
2021
·
IF 3.882
Jin Yuan,Zhuoran Liu,Minghui Dong,Ling Wang,Shuli Dong,Jingcheng Hao
Amphiphilicity is an excellent physicochemical property, which is yet to be explored from traditional surfactants to nanoparticles. This article shows that the amphiphilicity of copper nanoclusters (CuNCs) can be readily tuned by electrostatic interactions with cationic surfactants and cetyltrimethylammonium cations (CTA+) with counterions Br–, Cl–, and C7H8O3S–. Due to the role of surface ligands, the complexes of glutathione-capped CuNCs (GSH-CuNCs) and the surfactants exhibit good amphiphilicity, which enables them to self-assemble like a molecular amphiphile. This could significantly increase the utility of metal nanoclusters in basic and applied research. As the concentration of the surfactant changes, the aggregates change from nanoparticles to network-like structures. After the formation of supramolecular self-assemblies by hydrophobic interactions, the enhancement of fluorescence intensity was observed, which can be ascribed to the suppression of intramolecular vibrations based on aggregation-induced emission (AIE) and combined with the compactness of GSH-CuNCs in self-assemblies. Our study provides a facile way to generate solid fluorescent materials with excellent fluorescence performance, which may find applications in light-emitting diodes (LEDs).
研究领域:
材料科学
·
化学
·
纳米技术
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Chaomeng Dai,Wang Kai Tong,Jia Jie Zou,Min-tian Gao,Yalei Zhang,Shuguang Liu,Tingzhu Li,Jixiang Li,Jiajun Hu
Micro-nanobubbles (MNBs) with their negatively charged surface and cationic surfactant with a positively charged hydrophilic head were designed to synergistically solubilize polycyclic aromatic hydrocarbons (PAHs). Through response surface method experimentation, the results showed that MNBs had no obvious solubilizing effect for the PAH, phenanthrene . However, MNBs and the cationic surfactant didodecyldimethylammonium bromide (DDAB) had a synergistic solubilization effect on phenanthrene. Through the analysis of physical and chemical factors, it could be inferred that the synergy was caused by a conversion in the structure of the vesicles formed by DDAB after the combination of DDAB and MNBs. This structure conversion improved the phenanthrene solubility. In addition to being amplified, this synergy was verified to be universal and could be strengthened. The synergy, which increased with increasing DDAB and MNB concentrations, could achieve up to about 3 times the solubilizing as that without MNBs. In addition to DDAB, MNBs could also synergistically solubilize phenanthrene with other cationic surfactants. Changing the gas source of MNBs from air to nitrogen or oxygen could increase the negative surface charge, which enhanced the synergistic effect between MNBs and cationic surfactants. These results demonstrate a novel method for synergistic solubilization of PAHs by surfactant and MNBs while it can decrease the excessive use of surfactants causing the pollution issues. The synergistic effect between cationic surfactants and MNBs has the potential to be widely used in environmental and medical fields.
研究领域:
环境科学
·
医学
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产品关联
DOI
高影响因子
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