Effect of inorganic salts on the aggregation behavior of branched block polyether at air/water and n-heptane/water interfaces

Zhai, Xueru; Xu, Guiying; Chen, Yijian; Li, Teng; Zhang, Juan; Yuan, Jing; Tan, Yebang; Zhang, Jian

doi:10.1007/s00396-013-3013-y

Cited by 17 publications

(11 citation statements)

References 52 publications

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“…In accordance with the above results and research from Zhai and Chen [20,39], the salting-in effect and salting-out effect are illustrated in Fig. 5.…”

Section: Effect Of Inorganic Salts On Surface Activitysupporting

confidence: 86%

“…An increase in the cmc/C 20 means that adsorption is facilitated more than micellization [43]. Both the larger pC 20 and smaller cmc/C 20 on the addition of salting-out salts suggest that these salts facilitate the micellization; on the contrary, the salting-in NaSCN favors the adsorption in accordance with the conclusion made by Zhai [20].…”

Section: Effect Of Inorganic Salts On Surface Activitysupporting

confidence: 83%

“…In addition, increased molecule motion and chain flexibility at elevated temperature resulting in expanding of polyether molecules contribute to the increase in A min [55]. On the other hand, the increased dehydration of the PEO groups as the temperature increases improves the adsorption of polyether molecules as seen from increased pC 20 .…”

Section: Effect Of Temperature On Surface Activitymentioning

confidence: 99%

“…It is well known that crude oil from underground has plenty of inorganic salts [14][15][16][17], and the salts greatly influence the surface activity of polyethers [18][19][20][21][22]. Therefore, it is necessary to study the surface activity of polyethers at different temperature and inorganic salts because of the high temperature needed to break up crude oil emulsions.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Properties of a Novel Branched Polyether Surfactant

Shi

Zhao

et al. 2016

J Surfact & Detergents

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A novel branched polyether surfactant (TPE) was prepared by anion polymerization with different proportions of propylene oxide (PO) and ethylene oxide (EO) using 1,1,2,2‐tetrakis(4‐hydroxyphenyl)ethane as a core. The structures and average molecular weight (Mn) of the TPE were characterized by 1H NMR and GPC. The cloud point was determined by turbidimetry in the presence of inorganic salts. Inorganic salts decreased the cloud point of TPE polyether in the following order: Na2CO3 > Na2SO4 > NaCl > CaCl2 > MgCl2. The effects of inorganic salts (NaCl, MgCl2, CaCl2, and NaSCN) and temperature on the surface activity of TPE in aqueous solution were investigated by surface tension measurements. The surface activity parameters and the thermodynamic parameters were calculated from surface tension data. Similar to the effect of increasing temperature, the salting‐out inorganic salts such as NaCl, MgCl2, and CaCl2 favor the micellization and increase the maximum surface excess concentration, while the salting‐in NaSCN has the opposite effect. The influence of NaCl on the morphology of micelles was investigated by TEM. The micellization is entropy‐driven at low temperature and enthalpy‐driven at higher temperature. The TPE polyether has large surface activity and can be used as a demulsifier to break up crude oil emulsions.

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“…In accordance with the above results and research from Zhai and Chen [20,39], the salting-in effect and salting-out effect are illustrated in Fig. 5.…”

Section: Effect Of Inorganic Salts On Surface Activitysupporting

confidence: 86%

Section: Effect Of Inorganic Salts On Surface Activitysupporting

confidence: 83%

Section: Effect Of Temperature On Surface Activitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis and Properties of a Novel Branched Polyether Surfactant

Shi

Zhao

et al. 2016

J Surfact & Detergents

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“…Therefore, the decrease on CMC value in buffer solution was expected since TPGS exhibits an HLB value of approximately 13.2 [22]. A similar behavior, upon pH and ionic strength modification, was observed with other non-ionic poly(ethylene oxyde)-based copolymer as Pluronic ® F127 [31,32].…”

Section: Self-aggregation Of Tpgssupporting

confidence: 67%

Novel nelfinavir mesylate loaded d -α-tocopheryl polyethylene glycol 1000 succinate micelles for enhanced pediatric anti HIV therapy: In vitro characterization and in vivo evaluation

Morettón

Taira

Flor

et al. 2014

Colloids and Surfaces B: Biointerfaces

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Effects of Sodium Benzoate and Sodium Chloride on the Aggregation Behaviors of PEO‐PPO‐ph‐PPO‐PEO and PPO‐PEO‐ph‐PEO‐PPO at the Air/Water Interface

Gong

et al. 2018

J Surfact & Detergents

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The effect of sodium benzoate and sodium chloride on the aggregation behavior of PEO-PPO-ph-PPO-PEO (BPE) and PPO-PEO-ph-PEO-PPO (BEP) polyethers at the air/water interface was investigated by measuring the equilibrium surface tension, surface dilational viscoelasticity, and surface tension relaxation. The measurements of surface tension showed that sodium benzoate has a better effect on decreasing the surface tension of BPE and BEP solutions than NaCl, especially when the polyether concentrations are low. According to dilational viscoelasticity measurements, the concentration of BPE required for the maximum dilational modulus is lower than that of BEP, indicating that BPE more easily forms a compact adsorbed layer. The dilational modulus values of BPE solutions in the presence of sodium benzoate and NaCl first increase and then decrease after passing through a maximum, and then they increase again with increasing electrolyte concentration. On the other hand, the dilational modulus values of BEP solutions in the presence of sodium benzoate and NaCl first increase to a maximum and then decrease with increasing electrolyte concentration. The surface tension relaxation results are consistent with those of dilational viscoelasticity. The different effects of sodium benzoate and NaCl on the polyether aggregation behaviors are caused by the strong hydrophobic and π-π interactions between polyethers and sodium benzoate. This work has a great importance for the application and development of polyethers. ). Both chemicals were used directly without further purification because their purity was greater than 99.5%. Water used in the experiments was triple distilled with a quartz still.

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Effect of inorganic salts on the aggregation behavior of branched block polyether at air/water and n-heptane/water interfaces

Cited by 17 publications

References 52 publications

Synthesis and Properties of a Novel Branched Polyether Surfactant

Synthesis and Properties of a Novel Branched Polyether Surfactant

Novel nelfinavir mesylate loaded d -α-tocopheryl polyethylene glycol 1000 succinate micelles for enhanced pediatric anti HIV therapy: In vitro characterization and in vivo evaluation

Effects of Sodium Benzoate and Sodium Chloride on the Aggregation Behaviors of PEO‐PPO‐ph‐PPO‐PEO and PPO‐PEO‐ph‐PEO‐PPO at the Air/Water Interface

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