Xing-Feng Chen , Zhi-Cheng Xu , Qing-Tao Gong , Dong-hai Wu , Lei Zhang , Lu Zhang , Sui Zhao
{"title":"扩展阴离子表面活性剂在水-聚甲基丙烯酸甲酯界面上的吸附:聚氧乙烯基团的影响","authors":"Xing-Feng Chen , Zhi-Cheng Xu , Qing-Tao Gong , Dong-hai Wu , Lei Zhang , Lu Zhang , Sui Zhao","doi":"10.1016/j.colsurfa.2022.130395","DOIUrl":null,"url":null,"abstract":"<div><p><span><span><span>Wetting of solid surfaces is a typical phenomenon in daily life and manufacturing. The </span>wettability of solid surfaces can be efficiently altered by certain </span>surfactants<span><span>. Extended surfactants, a novel class of surfactant with a unique structure, have a potent potential to convert neutral surfaces into hydrophilic surfaces. To deeply understand the influence of EO groups on the adsorption mechanism of surfactants at solid surfaces, the wettability of the extended </span>anionic surfactants<span> sodium cetyl (oxyethylene)</span></span></span><sub>3</sub><span> carboxylate (C</span><sub>16</sub>EO<sub>3</sub>C), sodium cetyl (oxyethylene)<sub>5</sub> carboxylate (C<sub>16</sub>EO<sub>5</sub>C), and sodium cetyl (oxyethylene)<sub>7</sub> carboxylate (C<sub>16</sub>EO<sub>7</sub>C) on polymethylmethacrylate (PMMA) surfaces was investigated. Surface tension and contact angle experiments were used to determine adsorption characteristics such as adhesion tension, PMMA-liquid interface tension, and adhesion work. The experimental results show that the adsorption amounts of C<sub>16</sub>EO<sub>n</sub><span>C at the liquid-air interface are obviously larger than those at the PMMA-liquid interface. Below CMC, all three extended surfactant molecules adsorb at the PMMA-liquid interface via polar interactions and hydrophobic part towards the aqueous phase, which results in an increase of γ</span><sub>SL</sub>. However, the decrease of γ<sub>LV</sub> and the increase of γ<sub>SL</sub> have opposite effects on the contact angle, resulting in almost constant values below CMC. With an increase in EO number, the hydrophobic modification ability increases because longer EO chains provide stronger polar interactions between C<sub>16</sub>EOnC molecules and the PMMA surface. Above CMC, C<sub>16</sub>EOnC molecules continue to adsorb at the PMMA-liquid interface and form a bilayer film. Conclusively, the contact angle abruptly decreased due to the hydrophilic modification of the PMMA surface. With an increase of EO number, the hydrophilic modification ability increases because surfactants with a larger EO number endow the second layer with a more hydrophilic nature.</p></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":null,"pages":null},"PeriodicalIF":4.9000,"publicationDate":"2023-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"3","resultStr":"{\"title\":\"Adsorption of extended anionic surfactants at the water- polymethylmethacrylate interface: The effect of polyoxyethylene groups\",\"authors\":\"Xing-Feng Chen , Zhi-Cheng Xu , Qing-Tao Gong , Dong-hai Wu , Lei Zhang , Lu Zhang , Sui Zhao\",\"doi\":\"10.1016/j.colsurfa.2022.130395\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p><span><span><span>Wetting of solid surfaces is a typical phenomenon in daily life and manufacturing. The </span>wettability of solid surfaces can be efficiently altered by certain </span>surfactants<span><span>. Extended surfactants, a novel class of surfactant with a unique structure, have a potent potential to convert neutral surfaces into hydrophilic surfaces. To deeply understand the influence of EO groups on the adsorption mechanism of surfactants at solid surfaces, the wettability of the extended </span>anionic surfactants<span> sodium cetyl (oxyethylene)</span></span></span><sub>3</sub><span> carboxylate (C</span><sub>16</sub>EO<sub>3</sub>C), sodium cetyl (oxyethylene)<sub>5</sub> carboxylate (C<sub>16</sub>EO<sub>5</sub>C), and sodium cetyl (oxyethylene)<sub>7</sub> carboxylate (C<sub>16</sub>EO<sub>7</sub>C) on polymethylmethacrylate (PMMA) surfaces was investigated. Surface tension and contact angle experiments were used to determine adsorption characteristics such as adhesion tension, PMMA-liquid interface tension, and adhesion work. The experimental results show that the adsorption amounts of C<sub>16</sub>EO<sub>n</sub><span>C at the liquid-air interface are obviously larger than those at the PMMA-liquid interface. Below CMC, all three extended surfactant molecules adsorb at the PMMA-liquid interface via polar interactions and hydrophobic part towards the aqueous phase, which results in an increase of γ</span><sub>SL</sub>. However, the decrease of γ<sub>LV</sub> and the increase of γ<sub>SL</sub> have opposite effects on the contact angle, resulting in almost constant values below CMC. With an increase in EO number, the hydrophobic modification ability increases because longer EO chains provide stronger polar interactions between C<sub>16</sub>EOnC molecules and the PMMA surface. Above CMC, C<sub>16</sub>EOnC molecules continue to adsorb at the PMMA-liquid interface and form a bilayer film. Conclusively, the contact angle abruptly decreased due to the hydrophilic modification of the PMMA surface. With an increase of EO number, the hydrophilic modification ability increases because surfactants with a larger EO number endow the second layer with a more hydrophilic nature.</p></div>\",\"PeriodicalId\":278,\"journal\":{\"name\":\"Colloids and Surfaces A: Physicochemical and Engineering Aspects\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":4.9000,\"publicationDate\":\"2023-01-05\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"3\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Colloids and Surfaces A: Physicochemical and Engineering Aspects\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0927775722021501\",\"RegionNum\":2,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0927775722021501","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
Adsorption of extended anionic surfactants at the water- polymethylmethacrylate interface: The effect of polyoxyethylene groups
Wetting of solid surfaces is a typical phenomenon in daily life and manufacturing. The wettability of solid surfaces can be efficiently altered by certain surfactants. Extended surfactants, a novel class of surfactant with a unique structure, have a potent potential to convert neutral surfaces into hydrophilic surfaces. To deeply understand the influence of EO groups on the adsorption mechanism of surfactants at solid surfaces, the wettability of the extended anionic surfactants sodium cetyl (oxyethylene)3 carboxylate (C16EO3C), sodium cetyl (oxyethylene)5 carboxylate (C16EO5C), and sodium cetyl (oxyethylene)7 carboxylate (C16EO7C) on polymethylmethacrylate (PMMA) surfaces was investigated. Surface tension and contact angle experiments were used to determine adsorption characteristics such as adhesion tension, PMMA-liquid interface tension, and adhesion work. The experimental results show that the adsorption amounts of C16EOnC at the liquid-air interface are obviously larger than those at the PMMA-liquid interface. Below CMC, all three extended surfactant molecules adsorb at the PMMA-liquid interface via polar interactions and hydrophobic part towards the aqueous phase, which results in an increase of γSL. However, the decrease of γLV and the increase of γSL have opposite effects on the contact angle, resulting in almost constant values below CMC. With an increase in EO number, the hydrophobic modification ability increases because longer EO chains provide stronger polar interactions between C16EOnC molecules and the PMMA surface. Above CMC, C16EOnC molecules continue to adsorb at the PMMA-liquid interface and form a bilayer film. Conclusively, the contact angle abruptly decreased due to the hydrophilic modification of the PMMA surface. With an increase of EO number, the hydrophilic modification ability increases because surfactants with a larger EO number endow the second layer with a more hydrophilic nature.
期刊介绍:
Colloids and Surfaces A: Physicochemical and Engineering Aspects is an international journal devoted to the science underlying applications of colloids and interfacial phenomena.
The journal aims at publishing high quality research papers featuring new materials or new insights into the role of colloid and interface science in (for example) food, energy, minerals processing, pharmaceuticals or the environment.