{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,13]],"date-time":"2026-10-13T12:39:17Z","timestamp":1791895157416,"version":"4.3.4"},"reference-count":45,"publisher":"MDPI AG","issue":"1","license":[{"start":{"date-parts":[[2022,12,22]],"date-time":"2022-12-22T00:00:00Z","timestamp":1671667200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Shenzhen Science and Technology Program","award":["JSGG20220831092802004"],"award-info":[{"award-number":["JSGG20220831092802004"]}]},{"name":"Shenzhen Science and Technology Program","award":["[2020]434"],"award-info":[{"award-number":["[2020]434"]}]},{"name":"Ministry of Industry and Information Technology of the People\u2019s Republic of China","award":["JSGG20220831092802004"],"award-info":[{"award-number":["JSGG20220831092802004"]}]},{"name":"Ministry of Industry and Information Technology of the People\u2019s Republic of China","award":["[2020]434"],"award-info":[{"award-number":["[2020]434"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Membranes"],"abstract":"<jats:p>Water pollution caused by oil spills or sewage discharges has become a serious ecological environmental issue. Despite the membrane separation technique having a promising application in wastewater purification, the membrane fabrication method and separation robustness have remained unsatisfactory until now. Herein, we developed a novel strategy, spacer-assisted sequential phase conversion, to create a patterned polyvinylidene fluoride@polypropylene (P-PVDF@PP) substrate membrane with a multiscale roughened surface. Based on that surface structure, the underwater oil resistance behavior of the P-PVDF@PP membrane was improved. Moreover, owing to the abundant active sites on the P-PVDF@PP surface, the polydopamine\/P-PVDF@PP (PDA\/P-PVDF@PP) Janus membrane could be readily fabricated via wet chemical modification, which exhibited excellent switchable oil\u2013water separation performance. Regarding surfactant-stabilized oil-water emulsion, the as-prepared PDA\/P-PVDF@PP Janus membrane also had robust separation efficiency (as high as 99% in the n-hexane\/water, chloroform\/water, and toluene\/water emulsion separation cases) and desirable reusability. Finally, the underlying mechanism of emulsion separation in the PDA\/P-PVDF@PP Janus membrane was specified. The as-designed PDA\/P-PVDF@PP Janus membrane with high-efficiency oil\u2013water separation shows potential application in oily wastewater treatment, and the developed fabrication method has implications for the fabrication of advanced separation membranes.<\/jats:p>","DOI":"10.3390\/membranes13010014","type":"journal-article","created":{"date-parts":[[2022,12,23]],"date-time":"2022-12-23T01:42:13Z","timestamp":1671759733000},"page":"14","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Rational Design of PDA\/P-PVDF@PP Janus Membrane with Asymmetric Wettability for Switchable Emulsion Separation"],"prefix":"10.3390","volume":"13","author":[{"given":"Jingjun","family":"Peng","sequence":"first","affiliation":[{"name":"National Innovation Center for Advanced Medical Devices, National Institute of Advanced Medical Devices, Shenzhen 518110, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4199-4713","authenticated-orcid":false,"given":"Bhaskar Jyoti","family":"Deka","sequence":"additional","affiliation":[{"name":"Department of Hydrology, Indian Institute of Technology Roorkee, Roorkee 247667, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shaodi","family":"Wu","sequence":"additional","affiliation":[{"name":"Shanxi Engineering Research Center of Biorefinery, Institute of Coal Chemistry, Chinese Academy of Sciences, 27 South Taoyuan Road, Taiyuan 030001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhongyuan","family":"Luo","sequence":"additional","affiliation":[{"name":"National Innovation Center for Advanced Medical Devices, National Institute of Advanced Medical Devices, Shenzhen 518110, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0012-9384","authenticated-orcid":false,"given":"Jehad A.","family":"Kharraz","sequence":"additional","affiliation":[{"name":"School of Energy and Environment, City University of Hong Kong, Tat Chee Avenue Kowloon, Hong Kong SAR, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9688-6018","authenticated-orcid":false,"given":"Wei","family":"Jia","sequence":"additional","affiliation":[{"name":"National Innovation Center for Advanced Medical Devices, National Institute of Advanced Medical Devices, Shenzhen 518110, China"},{"name":"Institute of Biomedical and Health Engineering, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518110, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2022,12,22]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"115600","DOI":"10.1016\/j.watres.2020.115600","article-title":"Macro-corrugated and nano-patterned hierarchically structured superomniphobic membrane for treatment of low surface tension oily wastewater by membrane distillation","volume":"174","author":"Kharraz","year":"2020","journal-title":"Water. Res."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"18","DOI":"10.3390\/pollutants1010003","article-title":"The Mauritius Oil Spill: What\u2019s Next?","volume":"1","author":"Seveso","year":"2021","journal-title":"Pollutants"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"113325","DOI":"10.1016\/j.envres.2022.113325","article-title":"Identification of bilge oil with lubricant: Recent oil spill case studies","volume":"212","author":"Lee","year":"2022","journal-title":"Environ. Res."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"115536","DOI":"10.1016\/j.desal.2021.115536","article-title":"Superhydrophobic and superoleophilic PH-CNT membrane for emulsified oil-water separation","volume":"526","author":"Zhao","year":"2022","journal-title":"Desalination"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"102293","DOI":"10.1016\/j.jwpe.2021.102293","article-title":"Membrane fouling mitigation techniques for oily wastewater: A short review","volume":"43","author":"Ullah","year":"2021","journal-title":"J. Water. Process. Eng."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"7914","DOI":"10.1021\/es061842m","article-title":"Improved Mechanical Oil Spill Recovery Using an Optimized Geometry for the Skimmer Surface","volume":"40","author":"Broje","year":"2006","journal-title":"Environ. Sci. Technol."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"526","DOI":"10.1016\/j.cej.2016.12.010","article-title":"CNTs reinforced super-hydrophobic-oleophilic electrospun polystyrene oil sorbent for enhanced sorption capacity and reusability","volume":"314","author":"Wu","year":"2017","journal-title":"Chem. Eng. J."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"33","DOI":"10.1023\/B:WATE.0000038874.85413.05","article-title":"Improvement of a Gravity Oil Separator Using a Designed Experiment","volume":"157","author":"Fall","year":"2004","journal-title":"Water Air Soil. Poll."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"1705051","DOI":"10.1002\/adfm.201705051","article-title":"Biomimetic and Superwettable Nanofibrous Skins for Highly Efficient Separation of Oil-in-water Emulsions","volume":"28","author":"Ge","year":"2018","journal-title":"Adv. Funct. Mater."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"5740","DOI":"10.1002\/anie.201801736","article-title":"Thermo-Driven Controllable Emulsion Separation by a Polymer-Decorated Membrane with Switchable Wettability","volume":"57","author":"Zhang","year":"2018","journal-title":"Angew. Chem. Int. Ed. Engl."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"1800272","DOI":"10.1002\/mame.201800272","article-title":"Electrospun Janus Membrane for Efficient and Switchable Oil\u2013Water Separation","volume":"303","author":"Ranganath","year":"2018","journal-title":"Macromol. Mater. Eng."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"107532","DOI":"10.1016\/j.jece.2022.107532","article-title":"Membrane fouling and fouling mitigation in oil\u2013water separation: A review","volume":"10","author":"Sutrisna","year":"2022","journal-title":"J. Environ. Chem. Eng."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"1903","DOI":"10.1002\/app.1985.070300510","article-title":"Morphology of latex particles formed by poly(methyl methacrylate)-seeded emulsion polymerization of styrene","volume":"30","author":"Cho","year":"1985","journal-title":"J. Appl. Polym. Sci."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"120616","DOI":"10.1016\/j.memsci.2022.120616","article-title":"A greener approach to design Janus PVDF membrane with polyphenols using one-pot fabrication for emulsion separation","volume":"656","author":"Lee","year":"2022","journal-title":"J. Membr. Sci."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"118141","DOI":"10.1016\/j.memsci.2020.118141","article-title":"Development of Janus membrane with controllable asymmetric wettability for highly-efficient oil\/water emulsions separation","volume":"606","author":"Lin","year":"2020","journal-title":"J. Membr. Sci."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"9832","DOI":"10.1021\/acsami.7b19700","article-title":"Janus Membranes with Charged Carbon Nanotube Coatings for Deemulsification and Separation of Oil-in-water Emulsions","volume":"10","author":"An","year":"2018","journal-title":"ACS Appl. Mater. Inter."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"5062","DOI":"10.1021\/acsami.7b00017","article-title":"Janus Membranes with Opposing Surface Wettability Enabling Oil-to-Water and Water-to-Oil Emulsification","volume":"9","author":"Wu","year":"2017","journal-title":"ACS Appl. Mater. Inter."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"14610","DOI":"10.1002\/anie.201607581","article-title":"In Situ Generated Janus Fabrics for the Rapid and Efficient Separation of Oil from Oil-in-water Emulsions","volume":"55","author":"Wang","year":"2016","journal-title":"Angew. Chem. Int. Ed. Engl."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"13398","DOI":"10.1002\/anie.201601589","article-title":"Janus Membranes: Exploring Duality for Advanced Separation","volume":"55","author":"Yang","year":"2016","journal-title":"Angew. Chem. Int. Ed. Engl."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"1801495","DOI":"10.1002\/adma.201801495","article-title":"Janus Membranes: Creating Asymmetry for Energy Efficiency","volume":"30","author":"Yang","year":"2018","journal-title":"Adv. Mater."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"22408","DOI":"10.1021\/acsami.9b05191","article-title":"Design of a Janus F-TiO2@PPS Porous Membrane with Asymmetric Wettability for Switchable Oil\/Water Separation","volume":"11","author":"Yang","year":"2019","journal-title":"ACS Appl. Mater. Inter."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"119995","DOI":"10.1016\/j.memsci.2021.119995","article-title":"Superwettable Janus nylon membrane for multifunctional emulsion separation","volume":"642","author":"Zheng","year":"2022","journal-title":"J. Membr. Sci."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"102362","DOI":"10.1016\/j.cis.2021.102362","article-title":"Janus membranes for membrane distillation: Recent advances and challenges","volume":"289","author":"Afsari","year":"2021","journal-title":"Adv. Colloid Interfac."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"118499","DOI":"10.1016\/j.memsci.2020.118499","article-title":"Monolithic and self-roughened Janus fibrous membrane with superhydrophilic\/omniphobic surface for robust antifouling and antiwetting membrane distillation","volume":"615","author":"Zhu","year":"2020","journal-title":"J. Membr. Sci."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"20545","DOI":"10.1021\/acsami.9b04775","article-title":"Lotus- and Mussel-Inspired PDA-PET\/PTFE Janus Membrane: Toward Integrated Separation of Light and Heavy Oils from Water","volume":"11","author":"Liu","year":"2019","journal-title":"ACS Appl. Mater. Inter."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"117552","DOI":"10.1016\/j.seppur.2020.117552","article-title":"Bioinspired dopamine modulating graphene oxide nanocomposite membrane interposed by super-hydrophilic UiO-66 with enhanced water permeability","volume":"253","author":"Liu","year":"2020","journal-title":"Sep. Purif. Technol."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"130981","DOI":"10.1016\/j.matlet.2021.130981","article-title":"Surface modification of PVDF membrane by sulfonated chitosan for enhanced anti-fouling property via PDA coating layer","volume":"307","author":"Ren","year":"2022","journal-title":"Mater. Lett."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"404","DOI":"10.1016\/j.memsci.2015.08.039","article-title":"Flux stabilization in membrane distillation desalination of seawater and brine using corrugated PVDF membranes","volume":"495","author":"Kharraz","year":"2015","journal-title":"J. Membr. Sci."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"15321","DOI":"10.1039\/D1NJ01460A","article-title":"Facile preparation of cotton fabric with superhydrophilicity\u2013oleophobicity in air and superoleophobicity under water by using branched polyethyleneimine\/perfluorooctanoic acid composites","volume":"45","author":"Wang","year":"2021","journal-title":"New J. Chem."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"47963","DOI":"10.1021\/acsami.9b17494","article-title":"Omniphobic Nanofibrous Membrane with Pine-Needle-Like Hierarchical Nanostructures: Toward Enhanced Performance for Membrane Distillation","volume":"11","author":"Li","year":"2019","journal-title":"ACS Appl. Mater. Inter."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"118226","DOI":"10.1016\/j.memsci.2020.118226","article-title":"Omniphobic PVDF nanofibrous membrane for superior anti-wetting performance in direct contact membrane distillation","volume":"608","author":"Qing","year":"2020","journal-title":"J. Membr. Sci."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"14896","DOI":"10.1021\/acsami.5b03625","article-title":"A Scalable Method toward Superhydrophilic and Underwater Superoleophobic PVDF Membranes for Effective Oil\/Water Emulsion Separation","volume":"7","author":"Yuan","year":"2015","journal-title":"ACS Appl. Mater. Inter."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"162","DOI":"10.1016\/j.memsci.2017.06.089","article-title":"Superoleophobic surface modification for robust membrane distillation performance","volume":"541","author":"Chew","year":"2017","journal-title":"J. Membrane Sci."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"1902064","DOI":"10.1002\/admi.201902064","article-title":"Asymmetric Surface Engineering for Janus Membranes","volume":"7","author":"Li","year":"2020","journal-title":"Adv. Mater. Interfaces"},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"118360","DOI":"10.1016\/j.memsci.2020.118360","article-title":"Superhydrophobic (polyvinylidene fluoride-co-hexafluoropropylene)\/(polystyrene) composite membrane via a novel hybrid electrospin-electrospray process","volume":"611","author":"Jia","year":"2020","journal-title":"J. Membr. Sci."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"105418","DOI":"10.1016\/j.jece.2021.105418","article-title":"Impacts of PVDF polymorphism and surface printing micro-roughness on superhydrophobic membrane to desalinate high saline water","volume":"9","author":"Teoh","year":"2021","journal-title":"J. Environ. Chem. Eng."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"119242","DOI":"10.1016\/j.memsci.2021.119242","article-title":"Preparation of Janus membrane based on biomimetic polydopamine interface regulation and superhydrophobic attapulgite spraying for on-demand oil-water emulsion separation","volume":"627","author":"Xie","year":"2021","journal-title":"J. Membr. Sci."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"16305","DOI":"10.1021\/acs.iecr.0c03031","article-title":"Superhydrophobic Composite Cotton Generated from Raspberry-like Nanoparticles and Their Applications in Oil\/Water Separation","volume":"59","author":"Li","year":"2020","journal-title":"Ind. Eng. Chem. Res."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"2235","DOI":"10.1039\/D1EN00335F","article-title":"Integrated asymmetric superwetting Janus membrane for the efficient separation of various surfactant-stabilized oil\u2013water emulsions","volume":"8","author":"Chen","year":"2021","journal-title":"Environ. Sci.-Nano"},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"267","DOI":"10.1126\/science.268.5208.267","article-title":"Imaging the Condensation and Evaporation of Molecularly Thin Films of Water with Nanometer Resolution","volume":"268","author":"Hu","year":"1995","journal-title":"Science"},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"128250","DOI":"10.1016\/j.jhazmat.2022.128250","article-title":"Mechanically robust Janus nanofibrous membrane with asymmetric wettability for high efficiency emulsion separation","volume":"429","author":"Huang","year":"2022","journal-title":"J. Hazard. Mater."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"10047","DOI":"10.1039\/C9TA01686D","article-title":"Asymmetric superwetting configuration of Janus membranes based on thiol\u2013ene clickable silane nanospheres enabling on-demand and energy-efficient oil\u2013water remediation","volume":"7","author":"Li","year":"2019","journal-title":"J. Mater. Chem. A"},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"117475","DOI":"10.1016\/j.memsci.2019.117475","article-title":"Janus polyvinylidene fluoride membranes fabricated with thermally induced phase separation and spray-coating technique for the separations of both W\/O and O\/W emulsions","volume":"595","author":"Zuo","year":"2020","journal-title":"J. Membrane Sci."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"4485","DOI":"10.1021\/acsami.0c18788","article-title":"Preparation of Multipurpose Polyvinylidene Fluoride Membranes via a Spray-Coating Strategy Using Waterborne Polymers","volume":"13","author":"Xing","year":"2021","journal-title":"ACS Appl. Mater. Inter."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"122254","DOI":"10.1016\/j.seppur.2022.122254","article-title":"Constructing A Janus membrane with extremely asymmetric wettability for water unidirectional permeation and switchable emulsion separation","volume":"303","author":"He","year":"2022","journal-title":"Sep. Purif. Technol."}],"container-title":["Membranes"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2077-0375\/13\/1\/14\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T01:48:19Z","timestamp":1760147299000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2077-0375\/13\/1\/14"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2022,12,22]]},"references-count":45,"journal-issue":{"issue":"1","published-online":{"date-parts":[[2023,1]]}},"alternative-id":["membranes13010014"],"URL":"https:\/\/doi.org\/10.3390\/membranes13010014","relation":{},"ISSN":["2077-0375"],"issn-type":[{"value":"2077-0375","type":"electronic"}],"subject":[],"published":{"date-parts":[[2022,12,22]]}}}