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A new generation of ordered, mineral-reinforced polymer nanocomposites is emerging for which assembly of platelets into planar-random array provides the reinforcement structure. Motivated by this goal, Co–Al layered double hydroxide (LDH) tactoids (diameter ∼3μm, thickness ∼30nm) were synthesized and their colloidal stability in water as a function of pH was characterized by sedimentation and zeta-potential...
Multilayer core–shell structure hollow spheres were synthesized on the basis of hollow glass sphere (HGS) along with magnetic layer and conducting layer. The deposition of ferrite compound was conducted via chemical co-precipitation method onto HGS surface using ammonium acetate stabilizing precursor solution which performed as chemical plating process. The ratio of ammonium acetate: metal ion appeared...
The present work reports the influence of nano-cerium oxide particles on UV resistance of a polyurethane lacquer. Particles were initially stabilized in 3-phosphonopropyl based stabilizer and dispersed in a polyacrylate resin, followed by mixing with polyisocayanate hardener to obtain nanocomposite films. Static and dynamic light scattering and small angle neutron scattering techniques were employed...
We quantified the adsorption kinetics of cationic polyacrylamide (CPAM) of three charge densities but constant molecular weight and their effects on the dynamics of a polydisperse calcium carbonate (CC) flocculation at various ionic strengths. The adsorption kinetics of CPAM onto PCC can be explained by the balance of the electrostatic and van der Waals interactions, hydrogen bonding and steric hindrance...
In this study, the anisotropic character of natural sepiolite was revealed by a combination of techniques involving contact angle measurements, Atomic Force Microscopy (AFM), and molecular dynamics (MD) simulations. Capillary rise technique was used to determine the change in contact angle values for several wetting liquids and calculate the surface free energy and acid/base components of sepiolite...
Monodisperse magnetite nanoparticles (Fe 3 O 4 NPs) were synthesized by thermal decomposition of Fe(oleate) 3 in 1-octadecene containing oleic acid. Two kinds of oleic acid capped Fe 3 O 4 nanoparticles (Fe 3 O 4 @OA) with different shape but similar size were obtained, quasi-cubical and spherical respectively. Ligand exchange reaction with 2,3-dimercaptosuccinic...
8-Hydroxyquinoline-5-sulfonic acid (HQS) functionalized ZnS nanoparticles (ZnS-QS NPs) with strong fluorescence emission have been successfully synthesized. The ZnS-QS NPs can form hybrid complex with cation, water-soluble conjugated polyelectrolytes (P2) via electrostatic attractions. The photophysical properties of P2/ZnS-QS NPs complexes were studied by photoluminescent (PL) and UV–vis spectroscopy...
Here, a well-controlled method to prepare magnetic/cisplatin-loaded nanocapsules with different morphologies has been developed by using a W/O/W double emulsion-solvent evaporation technique. This study focuses on the influences of solvent removal method and existence of stabilizers on the characteristics of nanocapsules in a double emulsion procedure. Biodegradable poly(lactic-co-glycolic acid) [PLGA]...
Dioctylsulfosuccinate sodium surfactant (AOT) was selected as a structure-directing agent to prepare mesoporous MgO adsorbent by a hydrothermal method. The anionic AOT surfactant combines with Mg(OH) 2 crystallites to form AOT·Mg(OH) 2 micelle colloids by hydrogen bonding and electrostatic attraction to template the mesopores with diameter of 10–20nm in MgO nanoplates The whole process...
Multi-walled carbon nanotubes (MWCNTs) could be well dispersed in the aqueous solution of 1-hexadecyl-3-methylimidazolium bromide ([C 16 mim]Br), an amphiphilic ionic liquid, because of hydrophobic interaction. [C 16 mim]Br could self-assemble and form hemimicelles on the surfaces of MWCNTs. MWCNTs became positively charged due to the adsorption of C 16 mim + and negatively...
The micellar structure behavior of nonionic surfactants in nonpolar solvents has attracted great interest in the last years because of its application in the solubilization of several substances, material synthesis and stabilizers of insoluble reactive species in nonpolar solvents. In the present work we report a study on the determination of critical micellar concentration (CMC) and characterization...
This note provides methods to fabricate polymer surfaces which have similar advancing or receding contact angles with distilled water but dissimilar contact angle hysteresis. Poly(methyl methacrylate) (PMMA), Polystyrene, Polypropylene and Teflon AF were chosen, and three different methods namely spin coating, spray coating, and heat press were used in the fabrication. Contact angle measurements were...
A nanocrystalline PbTiO 3 particle/polymer hybrid was synthesized through controlled polymerization and the in situ hydrolysis of metal-organics. A PbTiO 3 precursor was synthesized from titanium isopropoxide, lead acetate, and 2-(methacryloyloxy)ethyl acetoacetate (MEAA). The PbTiO 3 precursor was coordinated by MEAA according to nuclear magnetic resonance and infrared spectroscopy...
In this study we prepared a series of gelatin–glucose conjugates through Maillard-type reactions (covalent coupling) between a modified gelatin hydrolysate and glucose. We confirmed the structures of these products through infrared and nuclear magnetic resonance spectroscopic analyses. Our gelatin–glucose conjugates exhibited excellent surface activity properties, including reduced surface tension...
First, we report observations achieved on a gravitationally driven film drainage with molten glass pointing out a stabilizing effect when temperature is larger than 1250°C. A model to describe the change of surface tension with the film thickness due to the evaporation of oxide species is proposed. A lubrication model is derived taking into account the gradient of surface tension. The final system...
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