Adsorption of Nonionic Mixtures at the Air–Water Interface: Effects of Temperature and Electrolyte

Penfold, J.; Staples, E.; Tucker, I.; Thompson, L.; Thomas, Robert K.

doi:10.1006/jcis.2001.8042

Cited by 30 publications

(47 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Some researchers (Penfold et al 2002) found that the sorption amount of nonionic surfactant decreased with the increasing mole fraction of anionic surfactant in mixed solution. Therefore, cationic and anionic surfactants are suggested to be used with nonionic surfactants for better performance.…”

Section: Anionic and Cationic Surfactantsmentioning

confidence: 99%

Bacteria-mediated PAH degradation in soil and sediment

Lü

Zhang

Fang

2011

Appl Microbiol Biotechnol

187

View full text Add to dashboard Cite

Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous in the natural environment and easily accumulate in soil and sediment due to their low solubility and high hydrophobicity, rendering them less available for biological degradation. However, microbial degradation is a promising mechanism which is responsible for the ecological recovery of PAH-contaminated soil and sediment for removing these recalcitrant compounds compared with chemical degradation of PAHs. The goal of this review is to provide an outline of the current knowledge of biodegradation of PAHs in related aspects. Over 102 publications related to PAH biodegradation in soil and sediment are compiled, discussed, and analyzed. This review aims to discuss PAH degradation under various redox potential conditions, the factors affecting the biodegradation rates, degrading bacteria, the relevant genes in molecular monitoring methods, and some recent-year bioremediation field studies. The comprehensive understanding of the bioremediation kinetics and molecular means will be helpful for optimizing and monitoring the process, and overcoming its limitations in practical projects.

show abstract

Section: Anionic and Cationic Surfactantsmentioning

confidence: 99%

Bacteria-mediated PAH degradation in soil and sediment

Lü

Zhang

Fang

2011

Appl Microbiol Biotechnol

187

View full text Add to dashboard Cite

show abstract

“…Anions on those cases enhance the association of water molecules and promotes water structure, and salt out the POE group responsible for reducing the cloud point and CMC. These anions include SO 4 2– , F – , PO 4 3– , OH – , and Cl – . − Thus, the investigation of the molecular behavior of mixed surfactant systems are not only important for a complete understanding of the surface energy mechanism, but are also essential in identifying specific application oriented technologies efficiently.…”

Section: Introductionmentioning

confidence: 99%

Effect of Electrolytes on Solution and Interfacial Behaviors of Double Chain Cationic–Nonionic Surfactant Mixtures for Hydrophobic Surface Wetting and Oil/Water Emulsion Stability Applications

Banerjee

Paria

2021

Langmuir

View full text Add to dashboard Cite

The solution behaviors of the binary mixture of double chain cationic surfactant didodecyldimethylammonium bromide (DDAB) with nonionic surfactants of varied head groups, EO-9 and EO-40, in the presence and absence of electrolytes were studied and found nonideal behavior. The different physicochemical properties such as Gibb’s surface excess (Γ), minimum area per molecule (A min), and interaction parameters at bulk (β M ) and interface (β σ ) were calculated. In the presence of nonionic surfactants, lowering of CMC, CVC, and surface tension at these two concentrations of DDAB were observed. The β M and β σ values indicate strong interaction between DDAB and EO-40 mixed system. Further, addition of electrolytes to the mixed systems show increased interaction and change of physicochemical properties because of the combination of electrical and salting out effects.

show abstract

“…At the air -water interface, the surface excess and area per molecule, the position of surfactant head and tail groups (and their thicknesses normal to the interface), and the number of solvent molecules associated with each adsorbed surfactant have been determined with precision using neutron reflectivity. [10][11][12]16,17 The adsorbed layer structure of nonionic surfactants is a function of the surfactant concentration, the alkyl and ethoxy chain lengths, and temperature.…”

Section: Introductionmentioning

confidence: 99%

“…For long ethoxy chains (>6 ethoxy units) head-group dehydration dominates and increased adsorption results. 16 Nonionic surfactant adsorption at the air -water interface has also been investigated using VSFS. 19 The appearance of CH 3 peaks in the C 12 E 5 -water VSFS spectrum at 0.1μM shows that adsorption commences far below the cmc (cmc = 71 μM).…”

Section: Introductionmentioning

confidence: 99%

Nonionic Surfactant Adsorption at the Ethylammonium Nitrate Surface: A Neutron Reflectivity and Vibrational Sum Frequency Spectroscopy Study

et al. 2010

View full text Add to dashboard Cite

The adsorbed layers of polyoxyethylene n-alkyl ether surfactants C(12)E(4), C(14)E(4), and C(16)E(4) at the EAN surface have a headgroup layer that is thin and compact (only approximately 30 vol % EAN). The headgroups do not adopt a preferred orientation and are disordered within the ethylene oxide layer. Alkyl tails contain a significant number of gauche defects indicating a high degree of conformational disorder. The thickness of the tail layer increases with increasing alkyl chain length, while the headgroup layer shows little change. Lowering the C(12)E(4) concentration from 1 to 0.1 wt % decreases the adsorbed amount, and the headgroup layer becomes thinner and less solvated, whereas C(14)E(4) and C(16)E(4) adsorbed layers are unaffected by dilution over the same concentration range. The C(16)E(4) layer thickness increases and area per molecule decreases on warming to 60 degrees C, but the adsorbed layer structures of C(12)E(4) and C(14)E(4) are unchanged. Both effects are attributed to surfactant solubility.

show abstract

Adsorption of Nonionic Mixtures at the Air–Water Interface: Effects of Temperature and Electrolyte

Cited by 30 publications

References 25 publications

Bacteria-mediated PAH degradation in soil and sediment

Bacteria-mediated PAH degradation in soil and sediment

Effect of Electrolytes on Solution and Interfacial Behaviors of Double Chain Cationic–Nonionic Surfactant Mixtures for Hydrophobic Surface Wetting and Oil/Water Emulsion Stability Applications

Nonionic Surfactant Adsorption at the Ethylammonium Nitrate Surface: A Neutron Reflectivity and Vibrational Sum Frequency Spectroscopy Study

Contact Info

Product

Resources

About