Preparation and Characterization of Stabilizer-Free Phytantriol-Based Water-in-Oil Internally Liquid Crystalline Emulsions.

Despite the widespread use of surfactants, there are known issues such as allergic reactions and formulation complications in their use as emulsion stabilizers. In this study, stabilizer-free water-in-oil (W/O) emulsions containing water, phytantriol, and almond oil were prepared by an ultra-turrax homogenizer, a standard laboratory equipment, and a high specialized high-shear device. Parameters such as mixing time, stirring rate, composition, order of addition of phases, and temperature were investigated to systematically optimize the preparation of the formulations through evaluating their accelerated physical stability by a centrifugal sedimentation technique.

Analysis of the structure-function relationship of alpha amylase complexed with polyacrylic acid.

Alpha-amylase is frequently used in technologies that require its immobilization, stabilization or encapsulation. Polyacrylic acid is a very suitable polymer for these purposes because it can bind to enzymes and then be released under certain conditions without altering the functional capacity of enzymes. The consequences produced by polyacrylic acid on alpha-amylase structure and function have been investigated through various techniques.

Controlled coagulation and redispersion of thermoresponsive poly di(ethylene oxide) methyl ether methacrylate grafted cellulose nanocrystals.

Hypothesis: Cellulose nanocrystals (CNCs) undergo precipitation in the presence of high concentrations of cationic surfactants in aqueous solutions. To avoid such behavior and/or to promote redispersion of CNC/surfactant mixtures, the CNC surface was grafted with poly di(ethylene oxide) methyl ether methacrylate, P(MEOMA).

Experiments: CNC-g-P(MEOMA) was characterized using the following techniques C solid-state nuclear magnetic resonance (C SSNMR), Fourier-transform infrared spectroscopy - attenuated total reflection spectroscopy (FTIR-ATR) and thermal gravimetric analysis (TGA).

Structural and Energetic Studies on the Interaction of Cationic Surfactants and Cellulose Nanocrystals.

We report a comprehensive study on the interactions between cationic surfactant homologues CnTAB (n = 12, 14, and 16) with negatively charged cellulose nanocrystals (CNCs). By combining different techniques, such as isothermal titration calorimetry (ITC), surface tension, light scattering, electrophoretic mobility, and fluorescence anisotropy measurements, we identified two different driving forces for the formation of surface induced micellar aggregates. For the C12TAB surfactant, a surfactant monolayer with the alkyl chains exposed to the water is formed via electrostatic interactions at low concentration.

Use of isothermal titration calorimetry to study surfactant aggregation in colloidal systems.

Background: Isothermal titration calorimetry (ITC) is a general technique that allows for precise and highly sensitive measurements. These measurements may provide a complete and accurate thermodynamic description of association processes in complex systems such as colloidal mixtures.

Scope Of The Review: This review will address uses of ITC for studies of surfactant aggregation to form micelles, with emphasis on the thermodynamic studies of homologous surfactant series.

Synthesis of amine functionalized cellulose nanocrystals: optimization and characterization.

A simple protocol was used to prepare amine functionalized cellulose nanocrystals (CNC-NH2). In the first step, epichlorohydrin (EPH) was reacted with ammonium hydroxide to produce 2-hydroxy-3-chloro propylamine (HCPA). In the next step, HCPA was grafted to CNC using the etherification reaction in an organic solution media.

Thermodynamic study of the micellization of zwitterionic surfactants and their interaction with polymers in water by isothermal titration calorimetry.

The micellization of a homologous series of zwitterionic surfactants, a group of sulfobetaines, was studied using isothermal titration calorimetry (ITC) in the temperature range from 15 to 65 °C. The increase in both temperature and the alkyl chain length leads to more negative values of ΔGmic(0) , favoring the micellization. The entropic term (ΔSmic(0)) is predominant at lower temperatures, and above ca.