Abstract
We investigate thermodynamic and structural properties of positively charged O/W microemulsion spherical nanodroplets, suspended in salt water and decorated with telechelic polymers PEO-m and PEO-2m at low and high volume fraction F (6.98%, 26.5%) by using Small Angle Neutron Scattering (SANS). We describe and propose an effective pair potential interaction between charged colloidal particles in solution both with and without added telechelic polymers PEO-m or PEO-2m.We solve Ornstein-Zernicke (OZ) integral equation in the Hypernetted Chain (HNC) closure relation to obtain the pair correlation function g(r) and the structure factor S(q). A good agreement is found between the experimental and numerical spectra assuming the interaction potentials to be the sum of attractive and repulsive contributions in terms of decoration or bridging of the nanodroplets by the PEO polymer chains.
Highlights
The interactions between surfactant molecules and synthetic polymers in aqueous solutions are of importance to many practical applications, e.g., in the food, pharmaceutical, biotechnology, nanotechnology, medicine, pharmacology, cosmetics, agriculture, water purification, electronic, optoelectronic, and enhanced oil recovery and consumer products industries [1,2,3].In these mixed systems, the nature of the polymers plays a very important role in the interaction between them and the surfactant film [4]
We have studied the Small angle neutron scattering (SANS) patterns for bare microemulsion as reference case and for samples with POE-m or POE-2m at different values of Φ and r
We have showed that the spherical shape of microemulsion nanodroplets is identical from = 1.4% to = 26.5%, and in the presence of PEOm or PEO-2m at different r, with an average radius of
Summary
The interactions between surfactant molecules and synthetic polymers in aqueous solutions are of importance to many practical applications, e.g., in the food, pharmaceutical, biotechnology, nanotechnology, medicine, pharmacology, cosmetics, agriculture, water purification, electronic, optoelectronic, and enhanced oil recovery and consumer products industries [1,2,3].In these mixed systems (surfactant and polymers), the nature of the polymers plays a very important role in the interaction between them and the surfactant film [4]. Using an approach derived from Milner and Witten, Meng and Russel [15] found an attractive interaction for telechelic chains between two flat plates analytically This behavior has been supported by experimental results [16, 17]. With regard to the curved surfaces, to our knowledge, the best description of the potentials between two spheres linked by telechelic polymers is given by Bhatia and Russel [20]. These authors used the diffusion equation and obtained numerical results. To obtain a precise and qualitative picture of the microemulsion nanodroplet organization with the addition of a hydrophobically modified polymer at one or both ends, we propose a model on the shape of the interaction potential that describes these systems
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