Study on the interfacial activation of dual surfactants in the process of forming porous membranes

Li, Zhendong; Lu, Xiaolong; Wu, Chunrui; Gao, Qijun; Song, Wei; Zhang, Hao

doi:10.1016/j.memsci.2016.08.023

Cited by 22 publications

(19 citation statements)

References 33 publications

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“…The similar phenomenon that adding a handful of additives with low molecular weight does not signally affect the viscosity of polymer solutions is reported previously. [ 15,21 ]…”

Section: Resultsmentioning

confidence: 99%

“…In brief, the composite surfactants with the HLB value of 10 were prepared as follows: the sum of the HLB values of the two surfactants multiplied by their respective proportions should be nearly 10. [ 21 ] The surface tension of the aqueous solution was measured by a surface tension meter (JYW‐200, Chengde Da Jia machine Co., Ltd., China) at room temperature (25 ± 2 °C).…”

Section: Methodsmentioning

confidence: 99%

“…Following, the polymer solution was immersed in a water bath of 40 °C, and the hardness of the flat‐plate polymer solution at different times was measured with a Shore digital rubber hardness tester (Libo instrument Co., Ltd., China). [ 21 ] During analysis, the distance between different test points was at least 1 cm. The solidification rate of the polymer solutions as a function of time is shown in Figure S1 (Supporting Information).…”

Section: Methodsmentioning

confidence: 99%

“…The ethanol bubble‐point method was used to appraise maximum pore diameter. [ 21 ] The hollow fiber was soaked in a measuring cylinder containing ethanol. Then nitrogen gas was pressed inside out from the PVDF membrane.…”

Section: Methodsmentioning

confidence: 99%

“…[ 5,8,9 ] The type of pore‐forming additives can mainly be divided into two categories: a) inorganic salts, such as lithium chloride [ 9,10 ] and lithium perchlorate; [ 11 ] b) organic compounds, such as polyethylene glycol (PEG), [ 12,13 ] polyvinylpyrrolidone (PVP), [ 14,15 ] and surfactants. [ 16–25 ] Surfactants are the most special pore‐forming additives because of their unique amphiphilic structure and have been widely used in the preparation of membranes. Zhang et al.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Improved Desalination Performance of Polyvinylidene Fluoride Hollow Fiber Membranes by the Intermediate Role of Surfactants

Kong

Liu

et al. 2020

Macro Materials & Eng

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Polymer hollow fiber membranes (HFMs) are the core or base membranes of various membrane processes (e.g., ultrafiltration and membrane distillation). Preparing polymer HFMs with higher water flux helps improve the efficiency of the membrane processes. Using pore‐forming additives is the commonly used and efficient method to improve the water flux. The current dilemma is that the conventional methods that increase the amounts or the molecular weight of the additives to improve the water flux usually lead to the decrease in membrane mechanical strength. Herein, different from the conventional research strategy, increasing the surfactant surface activity (SA) is first found to deeply promote the core of nonsolvent‐induced phase separation (NIPS) that of the mutual diffusion between water and dopes. As a result, this method distinctly improves the surface porosity (from 0.8% to 9.7%) and optimizes the pore size distribution of polyvinylidene fluoride (PVDF) HFMs. Benefit from these, the water flux of ultrafiltration (3.1‐fold increase, maximally) and direct contact membrane distillation (2.3‐fold increase, maximally) are increased greatly. Moreover, the mechanical strength is not negatively affected due to the additive amount of small molecule surfactants is constant and small (2.0 wt%).

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“…The similar phenomenon that adding a handful of additives with low molecular weight does not signally affect the viscosity of polymer solutions is reported previously. [ 15,21 ]…”

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Improved Desalination Performance of Polyvinylidene Fluoride Hollow Fiber Membranes by the Intermediate Role of Surfactants

Kong

Liu

et al. 2020

Macro Materials & Eng

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Preparation of hydrolysis of poly(acrylonitrile‐co‐methyl acrylate) membranes via thermally induced phase separation: Effects of hydrolysis conditions and additives

Zhang

Han

Qian

et al. 2018

J of Applied Polymer Sci

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In this work, melt processable poly(acrylonitrile‐co‐methyl acrylate) [(P(AN‐MA)] was hydrolyzed first and then formed into microporous membrane via thermally induced phase separation. In order to optimize the hydrolysis condition and fabricate hydrophilic PAN‐based membranes, a series of hydrolysis experiments were performed to indicate the influence of hydrolysis temperature, alkaline species and time. The structure and properties of hydrolyzed P(AN‐MA) [H‐P(AN‐MA)] membranes were also investigated. It was found that with the increase of hydrolysis temperature, pure water flux (PWF) increased first and then decreased. When the hydrolysis temperature increased to 30 °C, the PWF of the H‐P(AN‐MA) membrane was up to the maximum of 6712.7 L/m2 h, which increased by 1661.6 L/m2 h, compared with the P(AN‐MA) membranes. When 1 wt % sodium dodecyl sulfate (SDS) was incorporated into the diluents, the PWF increased dramatically, especially in high hydrolysis temperature. When the hydrolysis temperature was up to 70 °C, the PWF of H‐P(AN‐MA) membranes containing 1 wt % SDS increased by 2.3 times compared to the sample without SDS under the same condition. With 2 wt % amino functionalized multi‐walled carbon nanotubes (MWCNTs‐NH2) employed as the additive, the tensile strength was up to 4.55 MPa. When 1 wt % SDS and 0.5 wt % MWCNTs‐NH2 were mixed together, the bovine serum albumin rejection increased from 31.2% to 40.9%. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46380.

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Constructing Microstructures of Chlorinated Polyvinyl Chloride Microporous Membranes by Non-solvent Induced Phase Separation for High Permeate Flux and Rejection Performance

Xiao-mei

Cheng

et al. 2021

Fibers Polym

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Study on the interfacial activation of dual surfactants in the process of forming porous membranes

Cited by 22 publications

References 33 publications

Improved Desalination Performance of Polyvinylidene Fluoride Hollow Fiber Membranes by the Intermediate Role of Surfactants

Improved Desalination Performance of Polyvinylidene Fluoride Hollow Fiber Membranes by the Intermediate Role of Surfactants

Preparation of hydrolysis of poly(acrylonitrile‐co‐methyl acrylate) membranes via thermally induced phase separation: Effects of hydrolysis conditions and additives

Constructing Microstructures of Chlorinated Polyvinyl Chloride Microporous Membranes by Non-solvent Induced Phase Separation for High Permeate Flux and Rejection Performance

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