The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Surface flotation was modeled by a spherical particle residing at the liquid/gas interface and forces operating in the system. Basing on this model and known expressions for the forces, different equations were presented, which relate (1) attachment contact angle with particle central angle as a function of particle size and density as well as liquid density and surface tension, (2) detachment contact...
This study reports the first anionic miniemulsion polymerization of butyl cyanoacrylate droplets obtained by the low-energy emulsification method called PIC. Starting from an initial mixture of monomer, methanesulfonic acid (to limit monomer conversion during emulsification) and Tween ® 80 (to improve the crossing of the blood–brain barrier), controlled dilution led to the formation of BCA...
The present study synthesized five types of hydroxyapatite (Hap) particles containing light rare earth ions (Ln 3+ : La 3+ , Ce 3+ , Pr 3+ , Nd 3+ and Sm 3+ ) and Ca 2+ ions from aqueous solutions with different Ln/(Ln+Ca) atomic ratios ([X Ln ]) ranging from 0 to 0.15. The crystal phases of the products and their inner and surface structures...
The profile of a droplet sitting on a flat surface is related to the contact angle, when the surface is vibrated the droplet oscillations result in a fluctuation in the contact angle over time. Depending on the amplitude of vibration this can be accompanied with an oscillation of the position of the contact line, this motion occurs when the instantaneous contact angle exceeds the advancing angle or...
Shaking-assisted LBL deposition of gold nanoparticles (GNPs, 2.5±0.5nm) was carried out, along with the use of small non-toxic ethylenediamine (EDA) linker molecules for easy removal by sintering, in order to produce highly conductive gold patterns on polyimide substrates. First, shaking time were optimized by measuring the surface coverage of the first layer using large GNPs (12.8±1.4nm) since 2...
We demonstrate that changing the wettability of intact carbonate core samples saturated with brine and crude oil leads to measurable changes in the streaming potential coupling coefficient, zeta potential and excess charge transported by the flow. Consequently, measurements of streaming potential could be used to quantify the wetting state of core samples; they may also be used to determine if and...
The properties of metallic nanorods vary due to changes in their composition, size and shape, which all depend on the aspect ratio of the nanorods. This work focuses on the optimization of the aspect ratio of silver nanorods using response surface methodology (RSM). Seed-mediated approach, which is the newest method with less difficulty, has been used for the synthesis of silver nanorods. First, silver...
Synthesis of rod-like silica–gold core-shell structures is reported by using silica rods having length of ∼1μm and diameter of ∼200nm. Before deposition of gold nanoparticles the aforementioned silica rods were modified by using 3-aminopropyltrimethoxysilane (APTMS) in order to attach aminopropyl groups and consequently, to facilitate deposition of Au. There methods were used to deposit Au nanoparticles...
Asymmetric Janus ZnO spheres with partially attached PS spheres were prepared by both protecting layer mask technique and Pickering emulsion template in presence of polyelectrolyte (poly(allylamine hydrochloride)). The scanning electron microscopy images showed that the surface of ZnO sphere was clearly divided into two parts, one of which was densely packed with PS particles, and the other one was...
A series of nonionic surfactants derived from tannic acid were synthesized by reaction of tannic acid with different molar ratios of hydrolyzed caster oil. The chemical structures of the prepared surfactants were confirmed using FTIR and 1 H NMR spectra. The molecular weights of the compounds were determined using viscosity measurements and Gel permeation chromatography (GPC). The surface...
A free energy-minimizing simulation that allows computation of the shapes of sessile liquid drops on chemically patterned surfaces is described. A set of nondimensional results for drops on surfaces with a single wetting stripe is presented. Quantitative agreement is found with published experimental data for drops on many-striped surfaces, and a simple model for anisotropic wetting is evaluated.
The polyaniline/gold (PANI/Au) have been successfully deposited on the surface of the poly(tetrafluoroethylent) (PTFE) membrane by one step process via simple diffusing interfacial reaction. The concentration ratio of aniline monomer to doping agent affected the microstructure and electrical conductivity of the composite membrane. The morphology and structure of the as-prepared composite membrane...
Isocyanates hydrolysis, an important side reaction in direct synthesis of waterborne polyurethanes by miniemulsion polymerization has been studied experimentally and theoretically in the paper. A kinetic model has been developed considering the resistances due to the diffusion through the formed polymer and interfacial reaction in monomer miniemulsion. This model studied the hydrolysis process quantitatively...
Controlling the size distribution of a suspension of nanoparticles is often critical for their usefulness. We explore the influence of mixing conditions (stirring speed and reactor volume) and temperature on the characteristics of silica nanoparticles obtained by a recently described two-phase reaction. Using small angle X-ray scattering, we show that the size distribution is mainly controlled by...
Silver (Ag) nanoparticles loading temperature responsive hybrid microgels were readily prepared by in situ reduction of Ag + ions coordinated into poly(N-isopropylacrylamide) microgels. The weight percentage content of the entrapped Ag nanoparticles measured by thermogravity analysis tops 25%, and their average particle sizes determined by transmission electron microscopy are within the range...
Silver nanoribbons and nanoplates have been synthesized by the classical silver-mirror reaction by changing the reaction conditions at room temperature. It was found that the reaction time and [ammonia] were an important factor for the growth of nanoparticles having different morphologies. Silver nanoplates and nanoribbons can be achieved in high yield by adjusting the reaction time and ammonia content,...
Two series of long chain guanidine surfactants, mono-alkylguanidine and N,N,N′-dimethylalkylguanidine were synthesized and the effect of the alkyl chain length and the nature of the cationic headgroup on aggregation and antimicrobial activity were investigated. Surface tension and conductivity were applied to study the aggregation of the amphiphilic molecules in aqueous solution. The antimicrobial...
A temperature rise on the order of tenths of a degree is observed as one fluid spreads over a hygroscopic fluid. While this behavior is only exhibited with hygroscopic fluids, it is independent of the properties of the spreading fluid. The spreading induces a ‘rolling’ motion in the subphase which brings ‘fresh’ fluid to the surface, exposing it to the water vapor in the air. As water is absorbed...
A novel method is suggested for the formation of anisotropic silver halide nanoparticles by the direct reaction of silver nitrate (AgNO 3 ) with cetyl trimethyl ammonium bromide (CTAB)/chloride (CTAC) and sodium salicylate (NaSal) using worm-like micelles in aqueous solution. It is observed that the presence of a worm-like micellar phase is critical to the formation of anisotropic nanoparticles...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.