Micro & Nano Letters
·
2018
·Vol. 13
·期 7
·1011-1016
·
IF 0.841
Bin Zhang,Yujie Jiang
This work reports a novel environmentally friendly antibacterial and hydrophobic polyester [polyethylene terephthalate (PET)] fibre finished with ZnO containing quaternary ammonium compounds (QACsZnO). The results show that the QACsZnO can be coated onto the PET fibre surface, imparting perdurable antibacterial activity. It was found that the hydrophobicity and mechanical properties were improved greatly after the PET fibre was finished with QACsZnO. Additionally, the QACsZnO-finished PET fibre exhibited good antibacterial activities against Staphylococcus aureus , Escherichia coli and Bacillus subtilis . Moreover, QACsZnO-finished PET fibre was still capable of restoring its hydrophobicity, and it did not induce damage after dry-cleaning. These remarkable features of QACsZnO-finished PET fibre that were suitable for development of multi-function and textile applications on the market had increased dramatically.
研究领域:
材料科学
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纺织工程
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微生物学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Yuheng Chen,Longjie Cheng,Pavel Nesterenko,Boqiang Li,Haolin Yang,Xiao Li,Lan Li,Baiyang Chen
Free chlorine (FC), primarily existing as hypochlorite anion in alkaline water (pK a 7.5), could theoretically be analyzed by an ion chromatography (IC) system. However, the feasibility of direct FC detection by IC remains controversial in previous researches. To address this issue, this study systematically examined the fate of FC under varying IC eluent pH, anion exchange column (AEC) types, detectors, and suppression conditions. The results ultimately disprove it and show that the primary obstacle to direct FC analysis with IC system is its transformation: 31 %–41 % became Cl - and 59 %–69 % became immobile organic chloramines in AEC, due to its reaction with quaternary ammonium compounds (QACs) in AECs. Moreover, IC analysis of Cl - might be interfered by coexisting FC, although FC concentrations are typically much lower than Cl - . Eluent suppressor can also consume FC even when residual FC after AEC is limited. In contrast, variations in water pH do not affect FC stability, and a UV detector effectively distinguishes FC from other anions. This study hence for the first time elucidates several FC consumption mechanisms in IC system, which represent key barriers hindering FC analysis by IC, and accordingly provide some guidance on future efforts to develop novel AEC to overcome these barriers.
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
Materials
·
2024
·Vol. 17
·期 22
·5405
·
IF 3.1
Wenjie Li,Zhe Li,Fang-Yuan Zeng,Qi Zhang,Liwei Guo,Dan Li,Yong-Hui Ma,Zhi-Quan Liu
With the advancement of high-integration and high-density interconnection in chip manufacturing and packaging, Cu bumping technology in wafer- and panel- level packaging is developed to micrometer-sized structures and pitches to accommodate increased I/O numbers on high-end integrated circuits. Driven by this industrial demand, significant efforts have been dedicated to Cu electroplating techniques for improved pillar shape control and solder joint reliability, which substantially depend on additive formulations and electroplating parameters that regulate the growth morphology, crystal structure, and impurity incorporation in the process of electrodeposition. It is necessary to investigate the effect of an additive on Cu pillar electrodeposition, and to explore the Kirkendall voids formed during the reflowing process, which may result from the additive-induced impurity in the electrodeposited Cu pillars. In this work, a self-synthesized polyquaterntum (PQ) was made out with dual suppressor and leveler effects, and was combined with prototypical accelerator bis- (sodium sulfopropyl)-disulfide (SPS) for patterned Cu pillar electroplating. Then, Sn96.5/Ag3.0/Cu0.5 (SAC305) solder paste were screen printed on electroplated Cu pillars and undergo reflow soldering. Kirkendall voids formed at the joint interfaces were observed and quantified by SEM. Finally, XRD, and EBSD were employed to characterize the microstructure under varying conditions. The results indicate that PQ exhibits significant suppressive and levelled properties with the new structure of both leveler and suppressor. However, its effectiveness is dependent on liquid convection. PQ and SPS work synergistically, influencing the polarization effect in various convective environments. Consequently, uneven adsorption occurs on the surface of the Cu pillars, which results in more Kirkendall voids at the corners than at the center along the Cu pillar surface.
研究领域:
材料科学
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电子工程
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DOI
PubMed
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2015
·
IF 2.912
Lei Xiang,Xiong-Ke Wang,Yan-Wen Li,Xian-Pei Huang,Xiao-Lian Wu,Hai-Ming Zhao,Hui Li,Quan-Ying Cai,Ce-Hui Mo
A reliable, sensitive, and cost-effective method was developed for determining three quaternary ammonium compounds (QACs) including dodecyltrimethylammonium chloride, cetyltrimethylammonium chloride, and didodecyldimethylammonium chloride in various vegetables using ultrasonic-assisted extraction and gas chromatography–mass spectrometry. The variety and acidity of extraction solvents, extraction times, and cleanup efficiency of sorbents were estimated to obtain an optimized procedure for extraction of the QACs in nine vegetable matrices. Excellent linearities (R2 > 0.992) were obtained for the analytes in the nine matrices. The limits of detection and quantitation were 0.7–6.0 and 2.3–20.0 μg/kg (dry weight, dw) in various matrices, respectively. The recoveries in the nine matrices ranged from 70.5% to 108.0% with relative standard deviations below 18.0%. The developed method was applied to determine the QACs in 27 vegetable samples collected from Guangzhou in southern China, showing very high detection frequency with a concentration of 23–180 μg/kg (dw).
研究领域:
食品科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2016
·
IF 5.557
Xingran Zhang,Zhiwei Wang,Mei Chen,Mingxian Liu,Zhichao Wu
Biofouling is one of the major obstacles to the widespread application of membrane technology in water and wastewater treatment , and use of anti-biofouling membrane materials is an effective approach to suppress biofouling. In this study, anti-biofouling polyvinylidene fluoride (PVDF) membranes were prepared by blending quaternary ammonium compound (QAC). Effects of QAC dosages on the physicochemical properties and anti-biofouling behaviours of the modified membranes were systematically investigated. The results showed that QAC was successfully present on the membrane surfaces, as revealed by X-ray photoelectron spectroscopy, Zeta potential and contact angle analyses. Anti-fouling tests using individual organic model foulants showed that the modified membranes had higher membrane fouling rate against organic matters, which is consistent with the extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory. In contrast, the modified membranes demonstrated evident anti-bacterial behaviours when individual model bacteria were used, which cannot be evaluated by this theory. Interestingly, the modified membrane showed a clear anti-fouling activity in a membrane bioreactor (the sludge mixture contained both organic foulant and microorganisms), suggesting its concurrent efficiency in controlling fouling induced by both organic matters and bacteria. This might be attributed to the contact-killing effects of QAC and the dual interactions between bacteria and organic foulants in the mixed liquor of membrane bioreactor. The study offers an effective way to enhance membrane anti-biofouling ability through the addition of antibacterial agent QAC.
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
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2019
·
IF 4.561
Jingyi Ma,Na Liu,Mengen Huang,Limin Wang,Jianwei Han,Hui Qian,Fei Che
As new biomass derived raw material, cardanol has attracted the attention of numerous academic and industrial groups due to its renewability and unique structural features. In this work, seven cardanol-derived quaternary ammonium compounds (QACs) were synthetized with their physicochemical properties and antimicrobial ability evaluated. The surface tension was measured in aqueous medium by the platinum ring method, 2b has the optimal surface activities, which is considerably better than commercialized QAC product cetyltrimethylammonium bromide . Both broth dilution method and agar dilution method were used to obtain the MIC and MBC values of the targeted QACs. 1a , 1b , 2b inhibit the tested bacterial at a concentration of 32 μg/mL. Scanning electron microscopy (SEM) results intuitively showed that the QACs could interact with the bacterial cell membrane, for disrupting the integrity of the membrane. Meanwhile, it was found that the antimicrobial activity depended not only on the alkyl chain length, but also on the CMC value. To sum, seven cardanol-derived QACs were synthetized easily, which showed excellent surface activities and antimicrobial activity, as a promising alternative to the existing fossil fuel derived cationic surfactants and antiseptics.
研究领域:
化学
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生物学
·
材料科学
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产品关联
DOI
高影响因子
JOURNAL OF INORGANIC BIOCHEMISTRY
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2023
·
IF 3.9
Songtai Gao,Yujun Sun,Zhong Lu,Nan Jiang,Huaiying Yao
Antibiotics overuse and misuse increase the emergence of multidrug-resistant bacterial strains , which often leads to the failure of conventional antibiotic therapies. Even worse, the tendency of bacteria to form biofilms further increases the therapeutic difficulty, because the extracellular matrix prevents the penetration of antibiotics and triggers bacterial tolerance. Therefore, developing novel antibacterial agents or therapeutic strategies with diverse antibacterial mechanisms and destruction of bacteria biofilm is a promising way to combat bacterial infections. In the present study, the combination of quaternary ammonium compound poly(diallyl dimethyl ammonium chloride) (PDDA) with Cu 2+ was screened out to fight common pathogenic Staphylococcus aureus ( S. aureus ) through multi-mechanisms. This combination appeared strong synergistic antibacterial activity , and the fractional inhibitory concentration index was as low as 0.032. The synergistic antibacterial mechanism involved the destruction of the membrane function, generation of intracellular reactive oxygen , and promotion more Cu 2+ into the cytoplasm. Further, the combination of PDDA and Cu 2+ reduced the extracellular polysaccharide matrix, meanwhile killing the bacteria embedded in the biofilm. The biocompatibility study in vitro revealed this combination exhibited low cytotoxicity and hemolysis ratio even at 8 times of minimum bactericidal concentration . This work provides a novel antibacterial agents combination with higher efficiency to fight planktonic and biofilm conditions of S. aureus.
研究领域:
微生物学
·
药理学
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Sciences
·
2025
·
IF 6.3
Hao-Tian Liu,Han-Qing Zhao,Yi-Rui Yang,Shuang Wu,Jia-Ping Huang,Rui-Han Yu,Hongcheng Bai,Aqiang Ding,Daijun Zhang,Peili Lu
The organic pollutants, such as quaternary ammonium compounds, in high salinity flowback water from shale gas extraction may pose a severe risk to public health. Conventional biological technologies have limited effectiveness in the treatment of high-salt wastewaters, whereas electrocatalytic oxidation has shown potential for treating organic pollutants in high-salt flowback water. This study developed a carbon nanotubes (CNTs) doped Ru/Ir oxide coated Ti electrode CNTs-(Ru x Ir y O 2 )/Ti, which exhibited enhanced electrocatalytic performance for the treatment of quaternary ammonium compound in high-salt wastewater compared to the control metal oxide coated Ti anode (Ru x Ir y O 2 )/Ti, with pseudofirst-order reaction rate constant improved from 7.36 × 10 −3 to 1.12 × 10 −2 min −1 . Moreover, the CNTs-(Ru x Ir y O 2 )/Ti anode electrocatalytic oxidation system exhibited excellent cycling stability. Mechanism studies indicated that the CNTs-(Ru x Ir y O 2 )/Ti electrode enhanced singlet oxygen ( 1 O 2 ) generation, which played a major role in pollutant degradation. Furthermore, the formation of high concentrations of HClO and H 2 O 2 further facilitated the generation of 1 O 2 . This study may provide an efficient and green technology for the treatment of organic pollutants in high-salt shale gas flowback water.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
AMB Express
·
2018
·Vol. 8
·期 1
·1-10
·
IF 1.719
Zhang Xingran,Ma Jinxing,Chen Mei,Wu Zhichao,Wang Zhiwei
Extensive applications of quaternary ammonium compounds (QACs) in household and industrial products inevitably lead to their release into wastewaters; however, little attention has been paid to the acute effects on activated sludge. In this work, we investigated the responses of microorganisms in a membrane bioreactor (MBR) to transient shock loads of QACs with different alkyl chain length and their impacts on MBR performance. Results showed that QACs affected microbial viability and caused damage to key enzymes (e.g., ammonium monooxygenase and nitrite oxidoreductase), inhibiting organic matter degradation and nitrogen removal. The presence of QACs also caused negative influences on dehydrogenase activity, catalase and superoxide dismutase, thus increasing the production of reactive oxygen species. Moreover, QACs with longer alkyl chains and/or benzyl groups bonded to the nitrogen atom could induce a more severe damage to cell integrity and microbial viability. The interaction with QACs also induced the release of organic matters and the changes of adhesion properties of microbial products, resulting in aggravated membrane fouling in MBRs. Our results demonstrate the acute negative effects of QACs on activated sludge, and special attention should be paid to the performance of biological wastewater treatment processes subject to the shock loads of QAC-bearing industrial streams.
研究领域:
环境科学
·
微生物学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2015
·Vol. 39
·期 4
·648-654
·
IF 2.737
Chao-Xi Zeng,Rui-Pu Xin,Sui-Jian Qi,Bo Yang,Yong-Hua Wang
Aqueous two-phase systems, based on the use of natural quaternary ammonium compounds, were developed to establish a benign biotechnological route for efficient protein separation. In this study, aqueous two-phase systems of two natural resources betaine and choline with polyethyleneglycol (PEG400/600) or inorganic salts (K 2 HPO 4 /K 3 PO 4 ) were formed. It was shown that in the K 2 HPO 4 -containing aqueous two-phase system, hydrophobic interactions were an important driving force of protein partitioning, while protein size played a vital role in aqueous two-phase systems that contained polyethylene glycol. An extraction efficiency of more than 90% for bovine serum albumin in the betaine/K 2 HPO 4 aqueous two-phase system can be obtained, and this betaine-based aqueous two-phase system provided a gentle and stable environment for the protein. In addition, after investigation of the cluster phenomenon in the betaine/K 2 HPO 4 aqueous two-phase systems, it was suggested that this phenomenon also played a significant role for protein extraction in this system. The development of aqueous two-phase systems based on natural quaternary ammonium compounds not only provided an effective and greener method of aqueous two-phase system to meet the requirements of green chemistry but also may help to solve the mystery of the compartmentalization of biomolecules in cells.
研究领域:
生物化学
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环境科学
·
分子生物学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yaru Fan,Hongjing Tian,Kunpeng Wang,Guoli Zhou,Jingtao Wang,Guosheng Li,Yijun Cao,Yingwei Wang,Xiaobin Jiang,Weijie Kou
The demand for lithium resources is increasing globally. Salt lakes have been an important source of lithium exploitation. However, Mg 2+ /Li + separation is a challenge mainly for lithium extraction from salt lakes with high Mg 2+ /Li + ratio. In this paper, a novel monomer QTHEED with bis-quaternary ammonium was designed and synthesized. Composite nanofiltration membranes were also prepared by surface modification of polyamide membranes. The permeance (23.08 L m −2 h −1 MPa −1 ) and Li + /Mg 2+ selectivity (21.7) of modified membranes are both ∼3 times higher than those of the pristine membrane. Increased positive charge of membranes enhances the rejection of Mg 2+ . Furthermore, QTHEED modification brings hydrophilic groups, Turing structure, and larger membrane pores. Simulation results confirmed that the incorporation of the QTHEED enabled the membranes to effectively separate Mg 2+ and Li + and to be more conducive to the passage of water molecules. In addition, the nanofiltration performance of the modified membrane was stable after 40 h of continuous nanofiltration tests at 4 bar pressure. This study presented a novel and efficient approach for separating Mg 2+ and Li + in industrial settings.
研究领域:
材料科学
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环境工程
·
化学工程
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2017
·
IF 6.035
Xingran Zhang,Zhiwei Wang,Mei Chen,Jinxing Ma,Shipei Chen,Zhichao Wu
Widespread applications of membrane technology call for the development of antibiofouling membranes. For the in-situ membrane surface modification, the antibiofouling efficacy is always hindered by the inefficient presence of antimicrobial agents on membrane surface since they are blended with the polymers and distributed into the bulk membrane matrix. In this study, a compatible carbon carrier was adopted to assemble the quaternary ammonium compound (QAC@Carbon) for enhancing its surface segregation of polyvinylidene fluoride (PVDF) microfiltration membranes and simultaneously controlling QAC release, thereby improving the efficiency in mitigating biofouling. The results indicated that carbon carrier was capable of driving surface segregation of QAC without deteriorating the physicochemical properties of membranes. The QAC concentration on surface of the membrane modified by QAC@Carbon (MCQ) was 2.5-fold of membrane blended with QAC alone (MQ). Meanwhile, carbon carrier was capable of improving QAC stability in membrane matrix to ensure a lasting antibiofouling efficacy for engineering applications. Batch tests clearly exhibited that both MCQ and MQ had antibiofouling efficiency, while MCQ membrane under cross-flow filtration demonstrated better antibiofouling behaviors compared to MQ. This is mainly attributed to the reduced accumulation of microbial biomass and improved membrane physicochemical properties (higher permeability and porosity) compared to MQ. These findings highlight the potential of introducing QAC@Carbon into polymeric membranes as an effective strategy for fabricating antibiofouling membranes.
研究领域:
环境科学
·
材料科学
·
微生物学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）