JOURNAL OF POROUS MATERIALS
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2022
·Vol. 30
·期 2
·681-690
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IF 2.523
Sun Mengtian,Wu Liling,Wang Yang,Wang Xiaowu,Liu Qiong,Li Ming,Li Zhi
Abstract Ever-increasing application domains of Methylsilsesquioxane aerogels place a higher demand on the diverse wettability. This work prepares hydrophilic Methylsilsesquioxane aerogels under ambient pressure (APD) using 25 ml water and ethanol (EtOH) as co-solvents (12–36 vol% ethanol) and CTAB as a surfactant. We also find that the unique Methylsilsesquioxane aerogels with hydrophilic surface and hydrophobic interior are prepared when the volume fraction of EtOH ranges between 0 and 12 vol% and 36–60 vol%. The surface consists of a thin layer derived from the dissolved CTAB, which is responsible for the hydrophilicity of Methylsilsesquioxane aerogels. The hydrophilicity and hydrophobicity of the interior of Methylsilsesquioxane aerogels are related to the aggregation form of CTAB in EtOH-water mixed solvent. Too low or too high volume fraction of ethanol causes CTAB to form micellar aggregates, resulting in hydrophobicity. Further study reveals that the microstructures of Methylsilsesquioxane aerogels including skeletal size and silica particle size are significantly affected by the volume fraction of EtOH in co-solvent, which further influences the content of CTAB. In summary, the work provides a new method for the preparation of Methylsilsesquioxane aerogels with hydrophilicity, which enables the customization of the wettability of Methylsilsesquioxane aerogels and facilitates the expansion of their diverse applications. Graphical Abstract
研究领域:
材料科学
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化学工程
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DOI
高影响因子
Biosensors-Basel
·
2023
·Vol. 13
·期 1
·75
·
IF 5.4
Jun Cao,Wei Zhu,Ji Zhou,Bai-Chuan Zhao,Yao-Yu Pan,Yong Ye,Ai-Guo Shen
The development of a convenient, sensitive, rapid and self-sterilizing biosensor for microbial detection is important for the prevention and control of foodborne diseases. Herein, we designed a surface-enhanced Raman scattering (SERS) sensing nanoplatform based on a capture–enrichment–enhancement strategy to detect bacteria. The gold−Azo@silver−cetyltrimethylammonium bromide (Au−Azo@Ag−CTAB) SERS nanotags were obtained by optimizing the synthesis process conditions. The results showed that the modification of CTAB enabled the nanotags to bind to different bacteria electrostatically. This SERS sensing nanoplatform was demonstrated to be fast (15 min), accurate and sensitive (limit of detection (LOD): 300 and 400 CFU/mL forE. coliandS. aureus, respectively). Of note, the excellent endogenous antibacterial activity of CTAB allowed the complete inactivation of bacteria after the assay process, thus effectively avoiding secondary contamination.
研究领域:
生物传感
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食品安全
·
微生物学
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DOI
PubMed
高影响因子
CHEMICAL PHYSICS LETTERS
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2022
·
IF 2.719
Jie Xu,Feng Lin,Jingyu Wang,Yujie Wang
Photocatalytic cleavage of lignin C O bonds is a promising way to depolymerize lignin into aromatic value-added chemicals. However, the dispersibility of lignin in solvents and photocatalytic efficiency still face great challenges. Here, a micelle aqueous medium (CTAB-15) composed of hexadecyl trimethyl ammonium bromide and water was successfully prepared. 2-phenoxy-1-phenylethanol (lignin model compounds, PPol) and dioxanesolv poplar lignin have a good dispersion in CTAB-15. Compared to the previous reports, the highest photocatalytic efficiency can be obtained under optimal conditions by using the photocatalyst CdS. The main products formed by photocatalytic cleavage of lignin C O bonds are phenols and ketones. Mechanism studies show that CTAB-15 can provide sufficient hydrogen by photo-driven dissociation of water for photocatalytic cleavage of lignin C O bonds, which is critical to rapidly improving photocatalytic efficiency. The hydrogen, which is used to form acetophenone, comes from H 2 O and PPol. However, the hydrogen needed to form phenol comes only from PPol itself. In addition, the photocatalytic reaction follows a photogenerated electron-hole coupled redox process. This work develops a new direction for promoting the high-value utilization of lignin.
研究领域:
化学工程
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可再生资源利用
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DOI
高影响因子
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
研究领域:
环境科学
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材料科学
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DOI
高影响因子
NANOTECHNOLOGY
·
2024
·Vol. 35
·期 12
·125601
·
IF 2.9
Xia Pu,Wanling Cai,Huayao Chen,Fujie Yang,Xiaomei Mu
The key step in preparing mesoporous silica is to remove the organic template agent, and the most common method used to achieve this goal is high-temperature calcination. However, this method has many disadvantages, one of which is that it reduces the silanol density on the surface of mesoporous silica, which affects its subsequent modification. Ionic liquids (ILs) are often used as extractants. In this work, the 1-butyl-3-methylimidazolium chloride ([C4mim]Cl) IL is considered, and the effects of its concentration, reaction temperature, and reaction time as well as HCl concentration on the extraction rate and silanol density were investigated using an IL extraction template agent (cetyl trimethyl ammonium bromide (CTAB)). The results show that an IL concentration of 10%, a reaction temperature of 120 °C, a reaction time of 12 h, and an HCl concentration of 1% are the best reaction parameters; with these parameters, the extraction rate and the silanol density were found to be 93.19% and 2.23%, respectively. The silanol density of mesoporous silica treated by calcination is only 0.81%. A higher silanol density provides more reaction sites, so that the modified mesoporous silica treated with the IL can be loaded with more Zn ions.
研究领域:
材料科学
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化学工程
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Jiang Yang,Rongrong Fan,Shengke Li,Xiujuan He,Yingcheng Li,Wei Ding
Foam generated from solid foam sticks plays a crucial role in enhancing natural gas production by mitigating liquid accumulation in gas wells. Traditional solid foam sticks dissolve rapidly, releasing foam instantly, particularly at high downhole temperatures in gas wells. This necessitates frequent addition of surfactants to sustain foam generation. To address this issue, this study investigates the use of mesoporous silica nanocomposite to encapsulate the surfactant, cetyltrimethylammonium bromide (CTAB), as foam sticks, allowing for extended foam release. Mesoporous silica was synthesized through a sol–gel process involving a silica precursor and surfactant, utilizing alkali-acid catalysts in two steps. The resulting nanocomposite solid sticks were formed through aging and drying in a mold. The silica-surfactant nanocomposite was characterized by infrared spectroscopy (IR), scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS), and small angle X-ray diffraction (SAXD). Experimental results demonstrated the successful encapsulation of 68.2 % surfactant into an average size of 50 nm nanosized silica capsules with a mesoporous structure. Quantitative determination of surfactant release over time in brine at a high temperature (130 °C) was determined through thermogravimetric analysis (TGA), which showed 6.3 % surfactant remained in nanocomposite after 3 days. Foam performance from the released surfactants was evaluated using a dynamic foam apparatus and blender test. The study showed that foam could be control-released over a period of 7 days through surfactant diffusion from mesoporous nanoparticles . The release of CTAB follows the first-order release kinetic model. This research provides a sustainable solution by utilizing mesoporous silica nanoparticles as carriers for surfactants, resulting in longer-lasting foam for the gas well deliquification and the enhancement of gas production.
研究领域:
材料科学
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石油工程
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化学工程
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高影响因子
PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2017
·Vol. 43
·期 3
·286-293
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IF 1.908
Shuangfei Zhao,Fanyuhui Yan,Peng Zhu,Yong Yang,Huanming Xia,Ruiqi Shen,Yinghua Ye
In this study, the technology of micro-segmented flow was applied for continuous synthesis safely and shape control accurately to lead trinitroresorcinate (LTNR) particles. Besides, a micro chemical reaction and crystallization system were built. Crystal shape control technology of LTNR and micro-segmented flow technology were first combined using the system. Additionally, the effects of the flowing rate and chemical additives on LTNR micro-particles preparation were researched for shape control. The LTNR micro-particles were analyzed by XRD, DSC, laser scanning confocal microscope and laser particle size analyzer. The results shows that the LTNR particles size can be controlled from 20 to 400 μm by the flow rate and the concentration of hexadecyl trimethyl ammonium bromide (CTAB), while the shape of LTNR can be controlled by the concentration of glycerol and CTAB. Besides, there is a good linear relationship between the size and the activation energy. This illustrates that the LTNR particles with smaller size are more stable and have higher heat release. This study demonstrated the power of micro-segmented flow for generation of LTNR micro-particles with high quality and for tuning of particle properties.
研究领域:
化学工程
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材料科学
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DOI
高影响因子
JOURNAL OF THE ENERGY INSTITUTE
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2020
·
IF 4.748
Lin Bao,Wei Fu,Fengyu Li,Yanju Liu,Haobo Bi,Chunlong Jiang,Qizhao Lin
In this study, an experiment of macroscopic spray performance of stabilized nanofuels under high injection and ambient pressure is conducted on a Common rail direct fuel injection . The tested nanofuels have been prepared by DE20 (20% ethanol, 80% diesel by volume) blends with nano-CeO 2 at 25 ppm(DE20Ce25), 50 ppm(DE20Ce50),100 ppm(DE20Ce100) respectively. Furthermore, appropriate amount of CTAB whose weight is equal to CeO 2 and 2%vol 1-decanol were added as surfactant additive. All tested fuels were ultrasonically oscillated at a frequency of 40 khz for 45min in order to enhance their stability. The macroscopic spray characteristics of diesel-ethanol with dispersed cerium nanoparticles have been measured using the optical diagnostic techniques of shadowgraph . Comparing with those the pure diesel(D100), the spray penetration of DE20, DE20Ce25, DE20Ce50, DE20Ce100 increased by −3%, −1.8%, −0.3% and 9.5%, while the spray cone angle increased by −3%,4%,2.8% and 12.5% as well as spray area increased by −3%,-1.3%,0.6% and 31% respectively. The addition of nanoparticles also enhances the instability of fuel and shortens the crucial breakup time. In addition, the influence caused by increasing viscosity and surface tension are balanced by the disturbance. Furthermore, the macroscopic spray characteristics of DE20Ce50 show little difference with the pure diesel which means it can be a promising alternative fuel for CI engine with no required modification.
研究领域:
能源工程
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纳米技术
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DOI
高影响因子
ChemSusChem
·
2021
·Vol. 14
·期 8
·1962-1969
·
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.
研究领域:
电化学
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材料科学
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环境科学
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DOI
PubMed
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Lin-Lin Hou,Ye Wan,Jia-Yin Li,Jun-Rui Zhang,Keying Cui,Su-Juan Li
NiAu bimetallic nanostrips with nearly monodispersed structure were synthesized through a one-step electrodeposition method with cetyltrimethylammonium bromide (CTAB) involved as the stabilizer and Ni(NO3)2 and HAuCl4 with a molar ration of 1:1 as the precursor. The morphology of as-prepared NiAu bimetallic nanomaterials with different Ni/Au molar rations were characterized with scanning electron microscopy (SEM). The resultant NiAu bimetallic nanostrips showed good electrocatalytic activities toward hydrazine oxidation. Various parameters including Ni/Au molar rations, CTAB concentration and solution pH affecting the performance of NiAu bimetallic nanomaterials toward hydrazine detection were investigated. Under optimized conditions, NiAu bimetallic nanostrips based electrochemical hydrazine sensor has a linear response in the concentration range of 0.5 to 1665 pM, a lower detection limit of 0.1 pM and high detection sensitivity (1007 pA mM -1 cm -2 ). Most common ions and many environmental organic species do not interfere with the detection of hydrazine.
研究领域:
材料科学
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电化学
·
分析化学
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Weiliang Pan,Xun Zhang,Rui Deng,Li Gu,Xiuqing Tan,Shanji Yan,Ruihao Zhang,Qiang He
Waste activated sludge (WAS) is produced by urban sewage treatment plants, which contains pathogenic microorganisms, chemical elements, wiht high moisture content (>99%). To mitigate environmental pollution and reduce the volume of WAS, sludge dewatering are widely needed. The main objective of this study is to investigate the improvement in sludge dewaterability through the combined efficacy of tannic acid (TA) and cetyltrimethylammonium bromide (CTAB). Significant reductions in Capillary Suction Time (CST), Specific Resistance to Filtration (SRF), and moisture content of vacuum-filtered sludge cake (WC) were observed as experimental findings demonstrated the combined use of TA and CTAB. Specifically, CST decreased from 78.6 s to 15 s, SRF reduced from 1.12×10 13 m/kg to 2.23×10 12 m/kg, and WC decreased from 97.98% to 74.80%. The levels of polysaccharides and proteins present in various layers of the extracellular polymeric substances (EPS) within the sludge were reduced due to the interaction and formation of protein complexes with TA and CTAB. Additionally, these additives neutralized surface with a negative electrical potential of EPS, decreasing repulsion among sediment particles. This led to a decrease in the Zeta potential , while the contact angle and particle size of the sludge increased. Additionally, the hydrophobicity of the sludge particles was enhanced. As a result, intracellular moisture was released by disrupting the sludge cells. The findings presented here may assist in the development of sustainable and productive strategies for the management of sludge, ultimately promoting environmental protection and the well-being of urban communities.
研究领域:
环境科学
·
污水处理
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 5
·123555
·
IF 7.5
Long An,Yushan Zhao,Nanyue Zhang,Songjia Yang,Tianxiang Wang,Xiaojing Yang,Jiajia Shan,Xue Wang
A cetyltrimethylammonium bromide (CTAB)-modified zinc-based metal-organic framework (Zn-MOF) was developed for rapid detection of nanoplastics in aqueous environments. The Zn-MOF-CTAB was synthesized via an electrochemical in-situ method under ambient temperature and pressure conditions. To enhance nanoplastics capture, the organic ligand aminoterephthalic acid was incorporated to impart positive charges to the Zn-MOF within a wide pH range, while the cationic surfactant CTAB introduced hydrophobic groups, synergistically boosting the material’s adsorption capacity for aqueous nanoplastics. The MOF exhibited inherent electrochemical activity from the Zn(II)/Zn(I) redox couple, measured via linear sweep voltammetry (LSV). The peak current of this redox process decreased quantitatively upon nanoplastics adsorption. This current suppression was used as the direct detection signal for quantifying nanoplastic concentrations. For polystyrene (PS) nanoplastics (100 nm, 500 nm, 1 μm), the sensor achieved a low detection limit of 0.1 μg/mL. Furthermore, the practical applicability of this electrochemical sensing platform was validated in real water samples.
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高影响因子
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