NDLI: Morphology of ionic microemulsions: comparison of SANS studies and the net-average curvature (NAC) model

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Contents

Inside front cover

Non-covalently connected micelles (NCCMs): the origins and development of a new concept

The science of food structuring

Stimuli-responsive hydrogel thin films

Shear controlled crystal size definition in a low molar mass compound using a polymeric solvent

pH-dependent permeability change and reversible structural transition of PEGylated polyion complex vesicles (PICsomes) in aqueous media

Control of the entropic interactions and phase behavior of athermal nanoparticle/homopolymer thin film mixtures

Emulsification alters simulated gastrointestinal proteolysis of β-casein and β-lactoglobulin

Morphology of ionic microemulsions: comparison of SANS studies and the net-average curvature (NAC) model

Competition between crystallization and dewetting fronts in thin polymer films

Changes in molecular composition and packing during lipid membrane reconstitution from phospholipid–surfactant micelles

Generation and manipulation of “smart” droplets

Covalent and orthogonal multi-functionalization of terpolymers

Design of crosslinked hybrid multilayer thin films from azido-functionalized polystyrenes and platinum nanoparticles

Electrospray deposition producing ultra-thin polymer films with a regular surface structure

Endowing catanionic surfactant vesicles with dual responsive abilities via a noncovalent strategy: introduction of a responser, sodium cholate

Gold nanoparticle-PPE constructs as biomolecular material mimics: understanding the electrostatic and hydrophobic interactions

Selective protein and DNA adsorption on PLL-PEG films modulated by ionic strength

Disordered nanoparticle interfaces for directed self-assembly

Analytical theory and Monte Carlo simulations of gel formation of charged chains

Adsorption and self-assembly of linear polymers on surfaces: a computer simulation study

Point defects in two-dimensional colloidal crystals: simulation vs. elasticity theory

Effect of functionalization on the self-assembling propensity of β-sheet forming peptides

Phospholipid crystalline clusters induced by adsorption of novel amphiphilic triblock copolymers to monolayers

Shape-memory capability of binary multiblock copolymer blends with hard and switching domains provided by different components

Differential electronic states observed during A–B DNA duplex conformational transitions

Morphology of ionic microemulsions: comparison of SANS studies and the net-average curvature (NAC) model

Content Provider	Royal Society of Chemistry (RSC)
Author	Sabatini, David A. Szekeres, Erika Acosta, Edgar J. Harwell, Jeffrey H. Grady, Brian P.
Copyright Year	2009
Abstract	Microemulsion (µE) literature presents numerous scattering studies (neutron, X-ray, light) of ionic and nonionic surfactants that have elucidated the morphological transitions that µEs experience upon changes in formulation conditions such as electrolyte concentration and temperature. Unfortunately, up to now, there is no way to predict the morphology of these µEs, and only after the µE is prepared can the morphology be determined using scattering techniques. In this work we compare the average curvature and drop size predicted by the net-average curvature (NAC) model to the Porod radii and characteristic length obtained from neutron scattering of toluene µEs prepared with sodium dihexyl sulfosuccinate (SDHS) and electrolyte. While the drop sizes predicted by the NAC model do not exactly correspond to the aggregate size obtained after applying a Porod analysis of the SANS profiles, the inverse of the average curvature does match the characteristic size obtained from SANS. This observation is consistent with previous comparisons made for nonionic µEs. The difference between the drop size predicted by the NAC model (that matches the solubilization curves) and SANS morphology suggests that the area per molecule of the surfactant (in contact with the internal phase) changes with the curvature of the system. The area per molecule obtained from Porod plots of Type I and II µEs and from the analysis of the scattering profiles of film-contrast Type III µEs show that as the system approaches net zero curvature the area per molecule increases to a maximum value. The data presented in this work suggests that the NAC model can be used to predict essential elements of the morphology of µEs, which may help in the design of µE-based templated structures (nanoparticles, nanoporous materials, etc.).
Starting Page	551
Ending Page	561
Page Count	11
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	5
Issue Number	3
Journal	Soft Matter
DOI	10.1039/b809286a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	X-ray crystallography NAC Porod Electrolyte Sodium Neutron diffraction Toluene Nanoporous materials Microemulsion Surfactant Curvature
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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Microemulsion Microstructure(s): A Tutorial Review

Structural and electrochemical characterization of sodium solid electrolyte

Small Angle Neutron Scattering and X-Ray Diffraction Studies of Nanocrystalline Titanium Dioxide

Experimental determination of bending rigidity and saddle splay modulus in bicontinuous microemulsions

Neutron and x-ray diffraction studies of a-C:N:H

X-Ray Studies of Nanoporous Gold: Powder Diffraction by Large Crystals with Small Holes

Neutron and X-ray powder diffraction study of skutterudite thermoelectrics

Construction of Representative Pore Morphologies in Disordered Nanoporous Two-Phase Materials

Synthesis and characterization of electrically conducting polyaniline in water–oil microemulsion

Morphology of ionic microemulsions: comparison of SANS studies and the net-average curvature (NAC) model

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