Journal of Water Process Engineering
·
2025
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IF 6.7
Yue Miao,Xiaowen Huo,Yingying Zhao,Xiuling Liu,Haitao Wang,Jun Li,Na Chang
The utilization of surfactants in the fabrication of thin-film composite (TFC) membranes has proven to be an effective way for the regulation of interfacial polymerization (IP) process in order to obtain ideal polyamide (PA) layers. However, the uncontrollable migration of surfactants and the variety in the aggregated state of surfactants result in difficulty in regulation of the morphology of PA layer. Here, nonionic surfactant Span80 is introduced in organic-phase before IP process, and the impact of the transformation of Span80 from single molecules to micelles, as well as the morphology the PA layers is systematically investigated. The function of Span80 in IP process and its impact on improving the uniformity, compactness, and separation performance of the PA layer are demonstrated by molecular simulations. As has been proved that Span80 single molecules or micelles tend to form a surfactant layer composed by Span80 single molecules at the water-organic interface due to the lower interaction energy during their migration from the organic phase to the interface. The formation of this monolayer significantly reduces the water-organic interfacial tension, which promotes the diffusion of piperazine monomer, and accelerates the IP process. As a result, with the increasing Span80 concentration, the morphology of PA layer transforms from granular structure to denser micro-spherical structure. The more uniform PA layer helps to improve the performance of this nanofiltration membrane, with the Li + /Mg 2+ separation ratio increasing from 2.41 to 14.72, representing an approximately 6-fold enhancement in separation efficiency.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 28
·期 36
·1801421
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IF 13.325
Peng Meng,Yulong Wu,Quan Zhang,Guoan Cheng,Xiaoling Wu,Ruiting Zheng
The dielectric pulse effect is of interest for many applications such as sensors, smart triggers, and energy storage. In this paper, a general approach to achieve a room temperature dielectric pulse effect via solid–liquid phase transition in organic mixtures formed by conductive surfactants and insulating fluid is introduced. The dielectric pulse is caused by the self-formed blocking layer appearing during the solid–liquid phase transition by mixing Span80 and hexadecane. Using 50 Vol% Span80/hexadecane mixture, the dielectric peak intensity of 1191.6 is achieved at 11.9 °C. The dielectric peak intensity and the trigger temperature of mixtures can be tuned by changing the proportions of the components, the temperature ramping rate, and the components. The generality of the approach is also demonstrated in other organic matter such as Span series, alcohols, alkanes and their mixtures.
研究领域:
材料科学
·
传感器技术
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DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 46
·29677-29687
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IF 4.036
Kai Tu,Junyan Wu,Weixia Zhu
In this study, macroporous pH-sensitive poly[N-isopropylacrylamide-co-acrylic acid-sorbitan monooleate] hydrogels, termed as PNIPAM-co-AAc-Span80 hydrogels, with an enhanced hydrophobic property and a rich pore structure were prepared by free-radical polymerization in an ethanol/water mixture. The polymerizable surfactant AAc-Span80 was obtained by the esterification of acrylic acid (AAc) and sorbitan monooleate (Span80), which was used to copolymerize with N-isopropylacrylamide (NIPAM). The chemical structure, thermal stability, morphology, and amphipathy of the PNIPAM-co-AAc-Span80 hydrogels were characterized. The results showed that the polymerizable surfactant AAc-Span80 macromolecule introduced into the hydrogels could not only increase the hydrophobic property but also ameliorate the porous network morphology, which was conducive to high adsorption capacity for adriamycin hydrochloride (DOX). The adsorption results showed that the equilibrium adsorption capacity of DOX reached 467.5 mg g−1 within 48 h at pH 7.4, and the hydrophobic interactions and intermolecular hydrogen bonds were the main force in the adsorption process of DOX. The release results demonstrated that the macroporous pH-sensitive hydrogels loaded with DOX could release 98.7% of DOX at pH 5.0, which would be highly beneficial for the release of anti-cancer drugs in the environment of cancer cells. All the results demonstrate that the PNIPAM-co-AAc-Span80 hydrogels have great potential for the delivery of anti-cancer drugs.
研究领域:
材料科学
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药学
·
生物医学工程
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DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
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2018
·
IF 5.116
Zhenzhong Hou,Hai Lu,Qinghao Yang,Qiuli Zhao,Jun Liu
Porous polypyrrole (PPy) free-standing films are prepared by the self-assembly of a mixture of two long-chain surfactants (Span80 and OP10) via interfacial polymerization. The micromorphology of synthesized PPy is investigated by scanning electron microscope (SEM), while its electrochemical performance is evaluated by the means of cyclic voltammetry (CV), galvanostatic charge/discharge (GCD) and electrochemical impedance spectroscopy (EIS). The results show that the morphology of obtained PPy can be controlled from ruptured vesicle-like structure to network-like structure, then to coral-like structure by tuning the HLB (Hydrophile-Lipophilic Balance) value of mixed surfactant in the synthetic process, and the HLB value plays a crucial role in improving the electrochemical performances of as-prepared PPy. Particularly, interconnected PPy network bonded with ∼800 nm PPy particles could be perfectly prepared at HLB value of 10.4. Because of its larger active surface area , more excellent conductivity and higher porosity than other samples, the maximum specific capacitance and energy density are obtained up to 286 F g −1 and 39.7 Wh kg −1 , respectively, at a current density of 0.5 A g −1 . Furthermore, 88.6% of the initial specific capacitance is retained even after 2000 cycles.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2022
·
IF 6.76
Jie Qi,Xiaojiang Li,Xin Lv,Yang Ge,Jinyu Wang,Hongsheng Lu
Wax precipitation leads to destructive harms in the exploitation and transportation of petroleum. Solvent treatments can remove paraffin wax easily but the separation of solvent relying on distillation is admitted inefficient. Aiming at enhancing the separation and recovery performance of paraffin wax, CO 2 -responsive emulsion (SHS/W emulsion) based on switchable hydrophilicity solvents (SHS) is adopted. Since the paraffin wax is dissolved, emulsified, and dispersed by SHS/W emulsion, SHS/W emulsion exhibits better removal performance than SHS. The paraffin wax is recovered effectively upon introducing CO 2 , which attributes to the transformation of SHS from hydrophobic to hydrophilic state. Compared with the SHS system, the recovery of paraffin wax is improved obviously by introducing surfactant Span80. Owing to the deprotonation of SHS by bubbling N 2 and heating, 77.6% SHS is recycled after recovering paraffin wax. Here, the recycled SHS can be used to realize the removal of paraffin wax again. Thus, it is a promising and alternative strategy for realizing the sustainable and rapid removal of paraffin wax in the petroleum industry.
研究领域:
化学工程
·
石油工程
·
材料科学
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产品关联
DOI
高影响因子
DESALINATION
·
2025
·
IF 9.8
Lu Gao,Yue Miao,Xiaowen Huo,Yingying Zhao,Zhaojing Jing,Xiuling Liu,Haitao Wang,Ning Fan,Qiuying Jia,Kai Ren,Jun Li,Na Chang
The key to lithium extraction from brine lies in achieving efficient Li + /Mg 2+ separation, which imposes stringent requirements on the precision and efficiency of separation technologies. Among existing techniques, nanofiltration (NF) membranes stand out as a critical approach due to their superior ion-sieving capabilities, yet conventional NF membranes still face challenges in improving Li + /Mg 2+ separation ratios. In this study, the nonionic surfactant, Sorbitan monooleate dehydrate (Span80) was introduced to regulate the diffusion behavior of piperazine (PIP) molecules by reducing interfacial tension. Results from molecular dynamics simulations, ultraviolet spectroscopy experiments, and positron annihilation lifetime spectroscopy analysis revealed that Span80 enhances the uniform diffusion of PIP molecules at the interface, optimizes the membrane pore size distribution, and significantly improves Li + /Mg 2+ separation performance. The fabricated NF membrane achieved a Li + /Mg 2+ separation ratio of 94.28 under a Mg 2+ /Li + mass ratio of 100:1. This study introduces an innovative strategy for tailoring interfacial reactions via surfactant modulation, providing new insights into the design of high-performance NF membranes for lithium extraction from brine.
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DOI
高影响因子
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