Finding the right angle: The contact angle of nanoparticles at water/oil interface can be engineered close to 90° by capping with ligands containing carboxylic ester terminal groups. This drives self-assemble into close-packed films (see picture), and thus provides opportunity create two- or three-dimensional homo- heterogeneous nanostructures for electronic, optoelectrical, magnetic applications.

Herein we report a self-cleaning coating derived from zwitterionic poly(2-methacryloyloxylethyl phosphorylcholine) (PMPC) brushes grafted on solid substrate. The PMPC surface not only exhibits complete oil repellency in water-wetted state (i.e., underwater superoleophobicity), but also allows effective cleaning of fouled dry surfaces by water alone. was compared with typical superoleophobic realized the aid roughening applying hydrophilic nanostructures and those smooth polyelectrolyte...

Zwitterionic polymers and poly(ethylene glycol) (PEG) have been reported as promising nonfouling materials, strong surface hydration has proposed a significant contributor to the mechanism. Better understanding of similarity difference between these two types materials in terms protein interaction will benefit design new effective materials. In this study, sum frequency generation (SFG) vibrational spectroscopy was applied for situ real-time assessment sulfobetaine methacrylate (SBMA)...

Interfacial nanobubbles (INBs) on a solid surface in contact with water have drawn widespread research interest. Although several theoretical models been proposed to explain their apparent long lifetimes, the underlying mechanism still remains dispute. In this work, morphological evolution of INBs was examined air-equilibrated and partially degassed use atomic force microscopy (AFM). Our results show that (1) shrank while they grew slightly water, (2) three-phase boundary pinned during INBs....

In this work, we investigated the kinetic balance between ammonia-catalyzed hydrolysis of tetraethyl orthosilicate (TEOS) and subsequent condensation over growth silica particles in Stöber method. Our results reveal that, at initial stage, reaction is dictated by TEOS to form silanol monomers, which denoted as pathway I responsible for nucleation small via neighboring monomers siloxane network clusters derived thereafter. Afterward, newly formed onto earlier particles, II enlargement size...

The use of recycled aggregate concrete can save natural resources and reduce environmental pollution, which has been widely concerned in recent years. physical mechanical properties (RAC) are studied based on the literature waste coarse (RCCA) brick (RBCA) published around world last 40 years, order to understand study performance common RAC. characteristics (water absorption, density, crushing value) two aggregates with same particle size were compared. effects effective water–cement ratio...

Biologically active semiconductor quantum dot (QD)-labeled polystyrene (PS) beads with tailored QD loading and luminescence have been prepared via the layer-by-layer (LbL) assembly approach. PS of 925 nm diameter were used as templates for deposition CdTe nanocrystal/polyelectrolyte (PE) multilayers, formed electrostatic interactions, followed by an outermost layer anti-immunoglobulin G (anti-IgG) to render particles biospecific. The characterized transmission electron microscopy (TEM) well...

An electrostatic tuner: Long-range isotropic repulsion between identically charged nanoparticles can become anisotropic in the presence of short-range dipolar interactions, thus endorsing self-assembly into chains. The length these particle chains be tuned by controlling interparticle (see image). Supporting information for this article is available on WWW under http://www.wiley-vch.de/contents/jc_2002/2008/z705537_s.pdf or from author. Please note: publisher not responsible content...

Based on the interfacial self-assembly of magnetite nanoparticles, we demonstrate formation colloidosomes with shells predominantly composed monolayers liquid-like, close-packed nanoparticles. The gelation aqueous phase agarose leads to robust and water-dispersible nanoparticle colloidosomes, allowing encapsulation various water soluble materials. cutoff obtained is primarily defined by size. This controllable permeability should be great importance for application.

In this work, superhydrophobic surfaces were derived from binary colloidal assemblies. CaCO(3)-loaded hydrogel spheres and silica or polystyrene ones consecutively dip-coated on silicon wafers. The former assemblies recruited as templates for the latter self-assembly. Due to hydrophilicity difference between wafers spheres, region selective localization of leads irregular structures with a hierarchical roughness. subsequent modification low surface energy molecules yields surface. heating...

Binary colloidal crystals (see Figure) of large (L) and small (S) silica spheres with diameter ratios have been rapidly constructed by stepwise spin‐coating. The dominant structure the resultant is LS 2 , which 3 usually coexists. ratio speed spin‐coating are used to control structures, higher spin speeds favoring formation structures.

Encapsulation of enzymes in Pickering emulsions results a large interfacial area the enzyme-containing aqueous phase for biocatalysis organic media. This immobilization technique minimizes enzyme inactivation through stabilizing immiscible liquids by particles, facilitates separation processes, and significantly increases catalytic performance both stable vulnerable enzymes. Thus, broad technical applicability can be envisioned.

We present a thermodynamic evaluation of the self-assembly charged nanometer-sized particles at water/oil interface. The chemical potentials nanoparticles in bulk (aqueous) phase and interface are calculated taking into account interfacial energies, van der Waals interactions, electrostatic repulsions. An isotherm particle density as function surface charge on is obtained compared with experimental results gold CdTe self-assembled water/heptane Our model provides semi-quantitative...

This article gives an overview of recent progress in template-directed colloidal self-assembly. We first highlight crystallization and clustering guided by using lithographic patterns as templates. Secondly, we also outline current efforts on binary crystallization, paving a way to direct self-assembly colloids templating with assemblies. Finally, the use spheres templates is outlined.

The present article is devoted to systematically exploring the influence of various experimental variables, including precursor concentration, ligand nature, counterion type, Cd-to-Te molar ratio, pH, and temperature, on aqueous growth CdTe nanocrystals. may be divided into two stages: early fast stage later slow stage. found dominated by Ostwald ripening (OR), being strongly dependent all conditions. In contrast, adding monomers nanocrystals, which dramatically accelerated lowering...

This article highlights our recent achievement on directing nanoparticles to self-assemble at the water/oil interface. We demonstrate that contact angle of 90° is prerequisite for localize interface, which determined by terminal groups capping ligands. With this peculiar surface wettability, different sizes and chemical composition may into homogeneous or composite thin films The interfacially active be employed stabilize water-in-oil oil-in-water droplets, creating microcapsules whose...

We demonstrate a simple and reproducible way to produce quasi-spherical Au nanoparticles (NPs) with fairly narrow size distribution in water by rapidly adding mixture solution of HAuCl(4), sodium citrate, trace amount silver nitrate into boiling water. The sizes NPs obtained increases from 12 +/- 1 nm 18 3, 25 36 3 decrease the citrate concentration linear way. present protocol can efficiently minimize effect buffer pH reaction media thus change type reactive activity auric ions...

Single- or multicolor-encoded microspheres are created by confining water-soluble CdTe nanocrystals with different sizes within hydrogel of N-isopropylacrylamide and 4-vinylpyridine copolymer based on the pH-responsive swelling behavior gel (see Figure). The emission intensity level color resulting fluorescent spheres can be manipulated simply changing concentrations different-sized NCs their molar ratios.

Fluorescent microspheres were constructed by incorporating CdTe nanocrastals (NCs), costabilized both thioglycerol and thioglycolic acid, into poly(N-isopropylacrylamide) (PNIPAM) through hydrogen bonding between the ligands capped on NCs PNIPAM chains. The loading capacity of was found to be dependent incubation temperature. Under optimized conditions average spatial distance loaded hydrogel spheres is still greater than that required for Förster energy transfer NCs; therefore, very little...

Abstract Nanochemical printmaking : Colloidal lithography paves a powerful nanochemical way for patterning on planar substrates and microparticles. The feature size can easily be scaled down to 100 nm by reducing the diameter of microspheres shape diversified crystalline structure colloidal crystal mask, mask etching time, incidence angle vapor beam, registry (the azimuth beam). magnified image relies using crystals as masks deposition, allows fabrication various nanostructures non‐planar...