Association of Branched Polyethylene Imine With Surfactants in Aqueous Solution

Abstract

Three polymer-surfactant systems comprised of branched polyethylene imine (PEI) with an anionic surfactant (sodium dodecylsulfate; SDS), a cationic surfactant (tetradecyltrimethylammonium bromide; TTAB), and a zwitterionic surfactant ( N -tetradecyl- N , N -dimethyl-3-ammonio-1-propanesulfonate; SB3-14) were studied based on the properties of surface tension, pyrene fluorescence emission, dynamic light scattering, pH, and zeta potential measurements. The critical aggregation concentration ( cac ) and polymer saturation point ( psp ) were determined for all three systems. The effect of these surfactants on the physico-chemical characteristics (diameter and surface charge) of the complexes formed was determined. Polymer-surfactant interactions occurred in all of the systems studied, with the strongest interactions, electrostatic in nature, occurring in the SDS-PEI system. After the neutralization of the polymer charges with the addition of the surfactant, the hydrophobic effect started to control the interlacing of the polymer chains. For the PEI-TTAB system, a very dense film was formed at surfactant concentrations above 2.0 mmol L -1 . In this case, the bromide counter-ion interacted with both the positively-charged PEI and the head of the surfactant, which is responsible for the formation of double layer coordination complexes. For the system composed of PEI and the zwitterionic surfactant, less cooperative associations occurred in comparison with the other systems. ]]>

Reconfigurable Microcube Assemblies at the Liquid/Air Interface: The Impact of Surface Tension on Orientation and Capillary-Force-Interaction-Driven Assembly

“…For SDS, TTAB, and Triton X-100, the approximate CMC values of ∼8.0, ∼2.7, and ∼0.47 mM, respectively, were observed. These values are in full agreement with the results reported by others (8.0, 3.3, and 0.45 mM for SDS, TTAB, and Triton X-100, respectively), − although it is known that the CMC varies in practice due to small concentrations of surface-active impurities…”

Synthesis and Characterization of Dual-Sensitive Fluorescent Nanogels for Enhancing Drug Delivery and Tracking Intracellular Drug Delivery

“…The synthesis of fluorescent NPs with miscellaneous structures from PEI derivatives is widely explored in the field of nanomedicine, particularly for their use in drug delivery as carriers of different pharmaceutical agents because of the high transfection efficiency of PEI [ 28 , 29 , 30 ]. In this study, dual-sensitive bAPSC nanogels were synthesized from thiolated alginate and stearoyl-derivatized PEI through an amidation reaction by using N -(3-dimethylaminopropyl)- N ′-ethylcarbodiimide (EDC)/ N -hydroxysuccinimide (NHS).…”

Water soluble polymer–surfactant complexes-stabilized Pd(0) nanocatalysts: Characterization and structure–activity relationships in biphasic hydrogenation of alkenes and α,β-unsaturated ketones

“…However, the use of such potential supramolecular organizations as capping agents of metal nanoparticles still remains poorly investigated. Based on their structural characteristics, amphiphilic polymers and surfactants self-assemblies, such as modified-PEI, could produce thermodynamically stable catalysts, and potentially offer novel and original physico-chemical properties [27][28][29]. The driving force for the self-assembly of amphiphilic compounds relies on hydrophobic effects between the apolar counterparts of the molecules [30].…”