Adsorption and wettability of extended anionic surfactants with different PO numbers on a polymethylmethacrylate surface

Du, Yuechun; Zhou, Zhaohui; Gao, Ming; Han, Lu; Zhang, Lei; Yan, Feng; Wang, Mingxia; Zhang, Lu

doi:10.1039/d1sm00557j

Cited by 16 publications

(9 citation statements)

References 32 publications

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“…As powdery mildew grows, the surface of the cucumber leaf becomes more uneven, which requires more surfactant molecules to enable the spreading of pesticide droplets. For the Pyra + AEO-4 droplets, as the powdery mildew grew, an increasing number of surfactant molecules adsorbed on powdery mildew pathogens, and more molecules formed semimicelles and deposits on the surface of powdery mildew . This is equivalent to adsorption of surfactant molecules (originally located on the gas–liquid surface) by the liquid–solid interface.…”

Section: Resultsmentioning

confidence: 99%

“…The number of surfactant molecules adsorbed on cucumber powdery mildew leaves at each growth stage was greater than that of the AEO series. On cucumber powdery mildew leaves at No.2 and No.3 growth stages, there were more semimicelles formed by surfactant molecules adsorbed on the liquid–solid interface in Pyra + Silwet618 droplets than in Pyra + AEO-4 droplets . In the No.4 growth stage, due to the high complexity of the powdery mildew surface, more surfactant molecules adsorbed on the powdery mildew pathogens, and there were not enough free molecules at the gas–liquid interface, so the molecules in micelles automatically dissolved and adsorbed on the powdery mildew pathogens.…”

Section: Resultsmentioning

confidence: 99%

“…For the Pyra + AEO-4 droplets, as the powdery mildew grew, an increasing number of surfactant molecules adsorbed on powdery mildew pathogens, and more molecules formed semimicelles and deposits on the surface of powdery mildew. 40 This is equivalent to adsorption of surfactant molecules (originally located on the gas−liquid surface) by the liquid− solid interface. The spores and conidiophores of powdery mildew continuously adsorb surfactant molecules until saturation, leading to droplet diffusion.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…On cucumber powdery mildew leaves at No.2 and No.3 growth stages, there were more semimicelles formed by surfactant molecules adsorbed on the liquid−solid interface in Pyra + Silwet618 droplets than in Pyra + AEO-4 droplets. 40 In the No.4 growth stage, due to the high complexity of the powdery mildew surface, more surfactant molecules adsorbed on the powdery mildew pathogens, and there were not enough free molecules at the gas−liquid interface, so the molecules in micelles automatically dissolved and adsorbed on the powdery mildew pathogens. This is the reason why Silwet618 can undergo superdiffusion, and its activity and initiative in a dilute solution are relatively strong.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Regulating Droplet Wetting and Pinning Behaviors on Pathogen-Modified Hydrophobic Surfaces: Strategies and Working Mechanisms

Ding

et al. 2021

J. Agric. Food Chem.

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Hydrophobic surfaces modified by pathogens in agricultural production are one of the main reasons to reduce the utilization of pesticides. Adding surfactants to pesticide solutions is a common method to improve their wetting and spreading properties. In this work, the interaction mechanism between pathogen-modified hydrophobic surfaces and mixtures of surfactants and a pesticide was studied in detail. The interaction mechanism was determined by characterizing the wetting and spreading behaviors of droplets on cucumber powdery mildew leaves at different growth stages. When surfactants were added, droplets on cucumber powdery mildew leaves were in the Wenzel wetting state, the pinning force weakened, the contact line speed accelerated, and the adhesion force increased. We explained the micellar state and aggregation behavior of surfactant molecules in a pesticide solution that was applied to the surface of cucumber powdery mildew leaves. Droplets of solutions containing nonionic surfactants easily formed semibald micelles, binding to the pathogen of powdery mildew, whereas droplets containing cationic surfactants did not do so. Because of the electrostatic interaction between cationic surfactant molecules and powdery mildew pathogens, cationic surfactant molecules did not wet the pathogens very well, so we suggest adding nonionic surfactants rather than cationic surfactants to improve the wetting and spreading of pesticide solutions on cucumber powdery mildew leaves. This study provides new insights into enhancing the wetting and deposition of droplets on pathogen-modified hydrophobic surfaces.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Regulating Droplet Wetting and Pinning Behaviors on Pathogen-Modified Hydrophobic Surfaces: Strategies and Working Mechanisms

Ding

et al. 2021

J. Agric. Food Chem.

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“…By comparing the turbidity curves of FB 1, FB 3, FB 5 and FB 2, FB 4, FB 6, it can be found that the cloud point of demulsifier reduces. This is because the PO group is the hydrophobic group, which can reduce the solubility of the aqueous solution, so the cloud point also decreases . Therefore, when the content of EO is constant, the cloud point decreases with the increase of the content of PO.…”

Section: Results and Discussionmentioning

confidence: 99%

Synthesis and Study of a New Type of Fluorinated Polyether Demulsifier for Heavy Oil Emulsion Demulsification

et al. 2021

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To solve the problem of heavy oil demulsification difficulties in Liaohe Oilfield, phenolamine resin initiator was synthesized from p-trifluoromethyl phenol, and then FB series fluorinated polyether demulsifiers were synthesized by block polymerization using ethylene oxide (EO) and propylene oxide (PO) as raw materials. The demulsifiers were characterized by infrared spectroscopy, cloud point, hydrophilic–lipophilic balance (HLB) value, and surface tension. The demulsifying and dehydrating properties were tested by demulsifying and dehydrating experiments, the demulsification mechanism was analyzed by the microscopic demulsification process test, and the influence of demulsifier addition and demulsifying temperature on demulsifying performance was also studied. The results showed that under the condition of the optimum demulsification temperature of 60 °C and the optimum demulsifier dosage of 100 mg/L, the water removal (%) of fluorinated polyether demulsifier of FB 4 was the highest, and the overall water removal (%) of 50 mL crude oil emulsion in Liaohe Oilfield reached 90.33% within 2 h, which was better than the current demulsifier used in Liaohe crude oil.

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Effects of block and random copolymerization on the properties of fatty alcohol polyoxypropylene‐polyoxyethylene ether sulfates for enhanced oil recovery

Chen,

Lin,

Chen

et al. 2024

J Surfact & Detergents

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Enhanced oil recovery (EOR) by surfactant flooding has been attractive. Among the surfactants developed alcohol polyoxypropylene (PO)‐polyoxyethylene (EO) ether sulfates (APES), also named extended surfactants, have been proved efficient. However, the arrangement of the PO and EO chains as well as the hydrocarbon structure in the molecules may significantly affect their performances. In this paper three APES, C18−16PO25EO10SO4Na (I), C18−16(PO/EO)25+10SO4Na (II), and C16GA(PO/EO)25+10SO4Na (III) were prepared and investigated, in which APES (I) and APES (II) were designed to have same PO and EO numbers but block and randomly copolymerized respectively with linear C18−16 fatty alcohols as starting agent, whereas the APES (III) was derived from double chain C16 Guerbet alcohol (C16GA) with PO and EO randomly copolymerized. The results show that the block copolymerized APES (I) gives much better brine solubility and counterion tolerance than the randomly copolymerized APES (II) and (III). Although all APES synthesized are highly surface‐active and can reduce Daqing crude oil/simulated brine interfacial tension (IFT) to ultralow by mixing with more hydrophobic surfactants in presence or absence of alkali, the APES (III) gives the lowest IFT due to with double hydrocarbon chains. In addition, it is found that for APES (I) gelation occurs in neutralization process and the corresponding nonionic intermediate is highly viscous, whereas the randomly copolymerized two intermediates are liquid‐like with low viscosity, which may be feasible to apply SO3/air falling film sulfation. This study provided useful information for arrangement of embedded nonionic moiety and hydrocarbon structure in designing extended surfactants for EOR.

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Adsorption and wettability of extended anionic surfactants with different PO numbers on a polymethylmethacrylate surface

Abstract: The number of propylene oxide (PO) unit plays crucial role in controlling the wettability of surfactants on the surface of polymethylmethacrylate (PMMA).

Cited by 16 publications

References 32 publications

Regulating Droplet Wetting and Pinning Behaviors on Pathogen-Modified Hydrophobic Surfaces: Strategies and Working Mechanisms

Regulating Droplet Wetting and Pinning Behaviors on Pathogen-Modified Hydrophobic Surfaces: Strategies and Working Mechanisms

Synthesis and Study of a New Type of Fluorinated Polyether Demulsifier for Heavy Oil Emulsion Demulsification

Effects of block and random copolymerization on the properties of fatty alcohol polyoxypropylene‐polyoxyethylene ether sulfates for enhanced oil recovery

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