Colloid and Interface Science Communications
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2022
·
IF 5.633
Zhiguo Zhang,Zilong Guo,Wensheng Yang
Coating silica on Au particles has been known to be effective to improve their stability and performance. In this work, we demonstrated a cetyltrimethylammonium bromide (CTAB) assisted approach for preparation of Au@SiO 2 particles in ethanol/water mixtures. At ethanol content of 0.25, Au particles were well dispersed, while at ethanol content of 0.50, the aggregated Au particles were gradually dispersed with increasing CTAB concentration, attributed to the gradual formation of CTAB bilayer on the particle surface. When tetraethyl orthosilicate and ammonia were added directly to the Au particle dispersions, the Au@SiO 2 particles formed at the low ethanol content (0.25) were red in color and spherical in shape with a core composed of single Au particles, and these formed at the medium ethanol content (0.50) were purple in color and fractal-like in shape with a core composed of multiple Au particles.
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Journal of Biomedical Research
·
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.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 131
·期 16
·
IF 1.64
Shengguo Lu,Fang Luo,Xujia Duan,Chen Jia,Yuwang Han,He Huang
Hybrid nanoparticles composed of polydiacetylene (PDA) and magnetite (Fe 3 O 4 ) were fabricated by a double-emulsion method. The structure and composite form of the hybrid nanoparticles were investigated with transmission electron microscopy, scanning electron microscopy, Fourier transform infrared spectroscopy, and dynamic light scattering. The successful incorporation of magnetism to an attractive class of colorimetric PDA sensors was demonstrated. Compared with the PDA vesicles, the hybrid nanoparticles showed better colloidal stability with ethanol stimuli. In this study, we explored the colorimetric sensing ability of the hybrid nanoparticles in response to sodium cetyltrimethylammonium bromide (CTAB). The results show a high sensitivity to CTAB with a limit of detection at 30 μM. The biotin–streptavidin interaction was used as a sensing model to test ligand–receptor interactions on the hybrid nanoparticles' response. The concentration dependence of the chromic response was observed with the limit of visual detection at 20 μg/mL. The Fe 3 O 4 –PDA hybrid nanoparticles might have great potential applications in biosensing because of their advantages, including separation and sensing. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40634.
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LANGMUIR
·
2024
·
IF 3.7
Yandong Han,Wensheng Yang
In this study, we present a novel modified Stöber method utilizing cetyltrimethylammonium bromide (CTAB) as a mediator for the preparation of monodispersed, micron-sized supermicroporous silica particles. Observed results show prepared silica particles ranging in size from 0.64 to 1.36 μm with an increase in CTAB concentration from 1.0 to 5.0 mM. The particles exhibited low polydispersity (<5%), a high Brunauer–Emmett–Teller surface area (570 to 1064 m2/g), and pore volumes ranging from 0.22 to 0.39 cm3/g. The pore size, determined using the Barrett–Joyner–Halenda method from the adsorption branches of the isotherms, was approximately 1.9 nm, specifically 1.83, 1.85, and 1.90 nm, as the CTAB concentration increased from 1.0 to 2.5 and 5.0 mM, respectively. The resulting particles displayed a narrow distribution of pore diameters. In addition, to obtain an in-depth understanding of the role of CTAB on the preparation of silica particles, a possible mechanism is also investigated using conductivity, dynamic light scattering (DLS), zeta potential, FT-IR spectra, and transmission electron microscopy. Our findings demonstrate that CTAB plays multiple roles in the hydrolysis/condensation of TEOS (tetraethyl orthosilicate) and subsequent nucleation and growth of silica particles. CTAB acts as a template for superporosity, a stabilizer for colloids, and an accelerator for nucleation and growth, leading to formation of monodispersed micrometer silica particles. Further characterization through FT-IR and 29Si solid NMR spectra revealed that the micron silica particles were obtained with inhomogeneity in the condensation degree, allowing for selective etching through hot incubation to form micron-sized hollow silica spheres.
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CELLULOSE
·
2016
·Vol. 24
·期 1
·61-68
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IF 3.195
Lin Xuliang,Cai Cheng,Lou Hongming,Qiu Xueqing,Pang Yuxia,Yang Dongjie
Effect of cationic surfactants alkyltrimethylammonium bromide (C n TAB) with varied alkyl chain lengths on the enzymatic hydrolysis of Avicel and the surface charge of cellulase was investigated. Enzymatic hydrolysis of Avicel increased linearly from 42.1 to 61.4 % with the increase of the concentration of cetyltrimethylammonium bromide (C 16 TAB) logarithmically from 0.0001 to 0.01 mM, and reached a maximum value at the concentration of 0.01–0.03 mM. When the concentration was increased further, the cellulase solution became positively charged and the enzymatic hydrolysis of Avicel decreased rapidly. With the increasing alkyl chain length, C n TAB provided more proton and neutralized the negative charge of cellulase more obviously. Therefore, the required concentration of C n TAB could be less to enhance the enzymatic hydrolysis of Avicel. In addition, C 16 TAB could enhance enzymatic hydrolysis efficiency of corncob at high solid content from 35.0 to 56.3 %; C 16 TAB could reduce about 60 % of the cellulase loading in the enzymatic hydrolysis of corncob to obtain the same glucose yield. Effect of C 16 TAB on the enzymatic hydrolysis of typical pretreated softwood and hardwood was also investigated. This study laid the foundation for using C n TAB to recover cellulase, and provided the design direction for cellulase with higher activity and better stability by adjusting its hydrophilicity and chargeability.
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MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 2
·1-7
·
IF 6.408
Luo Fang,Zhang Yating,Zu Yexin,Li Shiqing,Chen Yiting,Chen Zhonghui,Huang Da,Qiu Bin,Lin Zhenyu
A good water-soluble and stable nanocomposite has been facilely prepared by the encapsulation of CsPbBr 3 QDs via cetyltrimethylammonium bromide and mineral oil through sonication, namely CsPbBr 3 @CMO nanocomposite. Such method is very quick and simple without complicated instruments and strict conditions. The results reveal that the synthesized CsPbBr 3 @CMO nanocomposite is spherical with uniform size and shows remarkably good solubility and stability in water. Specifically, the fluorescent intensity of CsPbBr 3 @CMO nanocomposite in water is decreased by 0.76% after 3 h; this result is comparable with those in earlier studies, and the good stability in water might be owned to the hydrophobic core of the CsPbBr 3 @CMO nanocomposite. The prepared CsPbBr 3 @CMO nanocomposite has been applied as a sensitive fluorescent probe for monitoring hydrogen sulfide (H 2 S), and the fluorescence intensity (~ 524 nm) has a linear relationship with the concentration of H 2 S in the range 0.15–105 µM with a detection limit of 53 nM, demonstrating application for monitoring H 2 S in rat brain coupled with microdialysis apparatus with satisfied results. The present study not only provides a simple but sensitive approach for the detection of H 2 S in living body, but also paves the way for expanding the application of CsPbBr 3 QDs to aqueous medium. Graphical abstract
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LANGMUIR
·
2024
·
IF 3.7
Nan Dai,Xinyi Liu,Lei Yang,Xi Huang,Dan Song,Song Wang,Kai Zhang,Xiaoying Liu,Wenxin Dong,Yuxin Zhang
This work aims to enhance the adsorption performance of Laponite @diatomite for organic pollutants by modifying it with cetyltrimethylammonium bromide (CTAB). The microstructure and morphology of the CTAB-modified Laponite @diatomite material were characterized using SEM, XRD, FTIR, BET, and TG. Furthermore, the influences of key parameters, containing pH, adsorbent dosage, reaction time, and reaction temperature, on the adsorption process were investigated. The kinetics, thermodynamics, and isotherm models of the adsorption process were analyzed. Finally, potential adsorption mechanisms were given based on the characterization. The research findings indicate that CTAB-La@D exhibits good adsorption performance toward Congo red (CR) over a broad pH range. The maximum adsorption capacity of CR was 451.1 mg/g under the optimum conditions (dosage = 10 mg, contact time = 240 min, initial CR concentration = 100 mg/L, temperature = 25 °C, and pH = 7). The adsorption process conformed to the pseudo-second-order kinetic model, and the adsorption isotherms indicated that the adsorption process of CR was more in line with the Langmuir model, and it was physical adsorption. Thermodynamic analysis illustrates that the adsorption process is exothermic and spontaneous. Additionally, the mechanisms of electrostatic adsorption and hydrophobic effect adsorption of CR were investigated through XPS and FTIR analysis. This work provides an effective pathway for designing high-performance adsorbents for the removal of organic dye, and the synthesized materials hold great capability for practical utilization in the treatment of wastewater.
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Processes
·
2023
·Vol. 11
·期 7
·1893
·
IF 3.5
Chenguang An,Xinxin Jiang,Wei Hong,Ye Sun,Tianle Zhu
A series of mesoporous NiO catalysts with high specific surface area were prepared by a simple hydrothermal method and modified by cetyltrimethylammonium bromide (CTAB) as the crystal structure directing regent. The characterization with SEM, XRD, BET, and H2-TPR results demonstrated that the introduction of CTAB effectively improved the dispersion, specific surface area, and pore volume and redox ability of NiO, and thus exposed more active sites. Meanwhile, the NiO catalyst with a CTAB/NiSO4·6H2O molar ratio of 2/3 exhibited the better catalytic ozonation performance of toluene, formaldehyde, methanol, and ethyl acetate than NiO. The in-situ DRIFTS elucidated the reaction path of catalytic ozonation of toluene and indicated that the introduction of CTAB facilitated the complete oxidation of by-products into CO2and H2O.Keywords:catalytic ozonation;typical VOCs;NiO catalyst;CTAB modification
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ChemSusChem
·
2021
·Vol. 14
·期 8
·1962-1969
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IF 8.928
Yanling Qiu,Wenbin Xu,Pengfei Yao,Qiong Zheng,Huamin Zhang,Xianfeng Li
Graphical A helping hand : Copper electrodes derived from Cu 2 O with predominant (111) facets are synthesized by cetyltrimethylammonium bromide-assisted preparation. The optimized electrode shows a high faradaic efficiency of 90 % for formic acid obtained by electrochemical reduction of CO 2 at −2.0 V (vs.SCE), which surpasses most reported Cu electrodes. The electrochemical reduction of CO 2 (ERC) to valuable chemicals has attracted extensive attention. However, the relatively low selectivity and efficiency of the reaction remain challenges. In this study, Cu electrodes derived from Cu 2 O with predominant (111) facets are synthesized by cetyltrimethylammonium bromide-assisted preparation. The optimized electrode shows a high faradaic efficiency of 90 % for HCOOH obtained by ERC at −2.0 V (vs.SCE), which surpasses most reported Cu electrodes. Based on a comprehensive analysis of the relationship between the catalytic activity and the thickness of the Cu 2 O layer, the catalytic activity of the unit active site on the Cu 2 O-derived Cu electrodes is found to be higher than that on the blank Cu electrode. DFT calculations indicate that OCHO* would be produced preferentially over *COOH in the presence of cetyltrimethylammonium bromide (CTAB). This deduction is verified by testing of the effects of CTAB and KBr addition on HCOO − selectivity.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2025
·
IF 3.5
Xun Li,Xuanying Lu,Bingtao Gui,Cheng Wang,Jun Liu,Liang Lu
Seawater uranium extraction is a key technology for environmental sustainability with significant potential applications. For the first time, this work synthesized a CTAB/Bent-MOF808 with strong stability, abundant coordination functional groups, and low cost, and assessed its adsorption effectiveness for U (VI) in carbonate solutions. The study explores how pH, contact time, uranium concentration, temperature, carbonate, halide salts, phosphorus, and Ca/Mg ions influence uranium adsorption, with a focus on mechanistic insights through characterization and modeling. Under optimal conditions (temperature of 25 °C, pH 8.0, with a sodium bicarbonate concentration of 2 mmol L −1 and a U(VI) concentration of 50 mg L −1 ), which are similar to the real seawater environment, CTAB/Bent-MOF808 demonstrated superior uranium adsorption performance compared to MOF808 and CTAB/Bent in U(VI)–CO 3 solutions. Under high initial pH, NaHCO 3 , Ca/Mg ions, and halide ion concentrations, the complex's uranium adsorption capacity and removal rate are reduced due to competitive adsorption between ions, as well as increased electrostatic repulsion on the surface. The sorption process was identified as monolayer homogeneous chemical adsorption process by analyzing it with quasi second order kinetic models and Langmuir isotherm models. The inhibitory effect of halide ions is as follows: I − > F − > Br − > Cl − . XPS suggested that the complexation of bromide anion with –COOH and electrostatic attraction could be crucial processes for uranium adsorption. This study offers theoretical insights into uranium extraction from natural uranium-bearing waters and highlights the expanded potential of MOF-based adsorbents in this process, enhancing both efficiency and application scope.
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CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Feilin Lin,Jianzhong Jiang
Emulsions have extensive applications in food, cosmetics, and agriculture, while the requirements for emulsions differ in various fields. It is a challenge for one emulsion to satisfy multiple requirements in different applications. Herein, CO 2 -switchable emulsions with controllable stability and viscosity were prepared by a mixture of chitosans (CS) and CTAB. After adding low concentrations of CTAB (e.g. 0.5 mM), the viscous Pickering emulsions stabilized by CS alone were converted into moderate-viscous Pickering emulsions due to the competition adsorption between CS aggregates and CTAB at the oil-water interface. The transformation of emulsion types (such as Pickering and conventional emulsions) and the emulsion's stability and viscosity were controlled by CO 2 /N 2 trigger. Furthermore, at high CTAB concentrations (≥ 0.8 mM), a novel long-term stable conventional emulsion was obtained after the CS aggregates at the oil-water interface were entirely replaced by CTAB. Compared with other stimuli, CO 2 is recognized as a green trigger that doesn't cause contaminations in the system, which has potential applications in organic synthesis and polymerization. Our strategy provides a simple and effective method to smartly control the properties of the emulsions (such as the emulsion type, stability, and viscosity), obtaining an intelligent emulsion to meet different requirements in many applications.
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LANGMUIR
·
2025
·
IF 3.9
Longhao Zhu,Jialuo Lin,Yaqiang Li,Xuesong Peng,Jiang Qin,Xin Li,Ruopeng Li,Penghui Ren,Ping Xu,Maozhong An
This study investigates the influence of long-chain quaternary ammonium surfactant cetyltrimethylammonium bromide (CTAB) on the performance of copper foil, including tensile strength and aqueous wettability. The addition of CTAB leads to an average ultrahigh tensile strength of 711 MPa and elongation of 7.32% of copper foil. Scanning electron microscopy (SEM), X-ray diffraction (XRD), and Electron backscatter diffraction (EBSD) analyses revealed that CTAB significantly reduced copper grain size and improved surface uniformity. Electrochemical tests confirmed the suppressing effect of CTAB on cathodic copper deposition. Density functional theory (DFT) calculation and in situ infrared spectroscopy (in situ FTIR) analysis show that adsorption of CTAB on the copper substrate suppresses the electroreduction of Cu2+ to Cu and increases the cathodic polarization, thus effectively refining the grain structure. This work validates CTAB as a potent suppressor for improving the mechanical properties and wettability of copper foils.
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