A strategy to modulate the electrocatalytic activity of copper toward CO2 reduction involving adsorption acrylamide, acrylic acid, and allylamine polymers is presented. Modification electrodeposited foam with poly(acrylamide) leads a significant enhancement in faradaic efficiency for ethylene from 13% (unmodified foam) 26% at −0.96 V vs RHE, whereas methane yield unaffected. Effects crystalline phase distribution oxide phases are ruled out as source through XPS situ XRD analysis. DFT...

We present a new class of superhydrophobic surfaces created from low-cost and easily synthesized aluminum oxide nanoparticles functionalized carboxylic acids having highly branched hydrocarbon (HC) chains. These chains are low surface energy materials (LSEMs) which can replace environmentally hazardous expensive fluorocarbons (FCs). Regardless coating method curing temperature, the resulting textured develop water contact angles (θ) ∼155° root-mean-square roughnesses (Rq) ≈ 85 nm, being...

Surface tensiometry and small-angle neutron scattering have been used to characterize a new class of low-surface energy surfactants (LSESs), "hedgehog" surfactants. These are based on highly branched hydrocarbon (HC) chains as replacements for environmentally hazardous fluorocarbon polymers. Tensiometric analyses indicate that subtle structural modification in the tails headgroup results significant effects limiting surface tensions γcmc at critical micelle concentration: higher level...

The synergistic effects of fumed-Si nanoparticles (Si-NPs) in combination with sodium dodecyl sulfate (SDS) surfactant as suitable agents for oil displacing enhanced recovery (EOR) are evaluated using a 5-spot glass micromodel. Optimum (45%) is obtained SDS near the critical micelle concentration; however, addition fumed silica enables further 13% enhancement maximum concentration SDS/Si-NPs (2.2 wt %) well delaying breakthrough point. optimum mass ratio SDS:Si-NP (1:11) suggests that Si-NPs...

Herein, we report the wettability and antifouling behavior of a range different siloxane coatings on plastic glass substrates. The films investigated are prepared using trimethoxysilane precursors with alkyl chain lengths (1-18 C atoms) in order to study how nature hydrophobic group affects parameters used characterize (contact angles, sliding contact angle hysteresis). Atomic force microscopy analysis shows that possess low surface topography [root mean squared roughness (rms) < 50 nm]...

Two series of Aerosol-OT-analogue surfactants (sulfosuccinate-type di-BCnSS and sulfoglutarate-type di-BCnSG) with hyperbranched alkyl double tails (so-called “hedgehog” groups, carbon number n = 6, 9, 12, 18) have been synthesized shown to demonstrate interfacial properties comparable those seen for related fluorocarbon (FC) systems. Critical micelle concentration (CMC), surface tension at the CMC (γCMC), minimum area per molecule (Amin) were obtained from measurements aqueous surfactant...

The formation of materials with tunable wettability is important for applications ranging from antifouling to waterproofing surfaces. We report the use various low-cost and nonhazardous hydrocarbon tune surface properties aluminum oxide nanoparticles (NPs) superhydrophilic superhydrophobic through covalent functionalization. surfaces are compared a fluorinated energy properties. role NPs' hydrophobicity on their dynamic interfacial behavior at oil–water interface ability form stable...

Graphene oxide (GO) can be surface modified for various purposes, including enhancing its properties or tailoring behaviour specific applications such as biosensing. Herein we report the of a carboxylate functionalized graphene that is both water repellent and electrically conductive. The GO first produced using Hummers method then with hyperbranched isostearic alcohol through an esterification reaction. as-deposited films were observed to cause "petal-like" wetting water, whereby droplets...

We examine a simple algorithm that uses simulated annealing to find molecules with specific boiling point and melting point. For testing purposes, we consider contain only carbon, oxygen, nitrogen hydrogen atoms. represent these as SMILES strings use seven distinct operators modify strings.

Pulsed-field gradient stimulated-echo nuclear magnetic resonance (NMR) and surface tension measurements have been used to study the effect of drug addition on micellization behavior pluronic triblock copolymers (P103, P123, L43). The 0.6 wt % flurbiprofen Pluronic P123 P103 solutions reduced their cmc promoted micellization. Also, a substantial increase in hydrodynamic radius from 5 10 nm was observed, along with an increased fraction polymer micellized, demonstrating that polymers...

The evaluation of the mechanism nanoparticle (NP)/surfactant complex adsorption at critical oil/water interface was studied. A sophisticated technique (neutron reflectometry) used to give a unique insight on NP/oil interactions in oil recovery systems. Herein, two modified alumina NPs with different degrees hydrophobicity [hydrophilic = 2-[2-(2-methoxyethoxy)ethoxy]acetic acid and hydrophobic octanoic (OCT)] stabilized surfactants were studied interface. thin layer deuterated (D)...

A highly branched green low surface energy surfactant (LSES), stable in harsh conditions, was synthesized for enhanced oil recovery (EOR). Oil factors were determined using a glass micromodel and indicated 72% increase both high brine solutions, remarkable result only single chain flooding. The surface-interface analysis of brine/surfactant solutions carried out, while small-angle neutron scattering measurements used to determine the changes structure different ζ potential experiments...

The micellization of Pluronic triblock copolymers (P103, P123, and L43) in the presence flurbiprofen at different pH was studied by small-angle neutron scattering (SANS), pulsed-field gradient stimulated-echo nuclear magnetic resonance (PFGSE-NMR), surface tension measurements. Addition to low leads an increase fraction micellization, aggregation number, core radius micelles. However, changing above pKa ethanol/water mixture (∼6.5) reduces results a weaker interaction between drug micelles...

Structural changes in the micellization of Pluronics P103 and P123, as a function temperature, cosolvent (ethanol, 10 v/v %), addition hydrophobic drug flurbiprofen, were investigated by SANS tensiometry. Addition ethanol increases critical concentration (making polymer more soluble), while increasing repulsive interactions between flurbiprofen-Pluronic spherical complexes. However, temperature both aggregation number core radius leads to dehydrated core. The flurbiprofen Pluronic was also...

Formation of a pH-sensitive coupling layer through both physisorption and chemisorption is reported.

The interaction between deuterium-labeled Aerosol OT surfactant (AOT-d34) and sterically stabilized poly(methyl methacrylate) (PMMA) latex particles dispersed in nonpolar solvents has been studied using contrast-variation small-angle neutron scattering (CV-SANS). electrophoretic mobilities (μ) of the latexes have measured by phase-analysis light scattering, indicating that μ is negative. Two analogues stabilizers for as free polymers absence PMMA latexes: poly(12-hydroxystearic acid) (PHSA)...

The carboxylation of alumina nanoparticles (NPs), with bifunctional carboxylic acids, provides molecular anchors that are used for building more complexed structures via either physisorption or chemisorption. Colloidal suspensions the NPs may be prepared by covalently bonding a series acids secondary functional groups (HO 2 C-R-X) to surface NPs: lysine (X = NH ), p -hydroxybenzoic acid OH), fumaric CO H), and 4-formylbenzoic C(O)H). Subsequent reaction octylamine at 25°C 70°C was...