Plant cuticles are broadly composed of two major components: polymeric cutin and a mixture waxes, which infiltrate the matrix also accumulate on surface, forming an epicuticular layer. Although thought to play number important physiological roles, with most being restrict water loss from aerial plant organs, relative contributions waxes cuticle function still not well understood. Tomato (Solanum lycopersicum) fruits provide attractive experimental system address this question as, unlike...

Here, we present a simple platform for the use of enhanced emission 16-mercaptohexadecanoic acid (16-MHA) capped CdSe quantum dots (QDs) as probe ultrasensitive copper(II) detection. In this study, photoluminescence (PL) QDs was first by Ag nanoprisms which were self-assembled on Si surfaces and then further increased photobrightening. Using approach, control different analytes could be readily probed all single using fluorescence microscopy. The PL intensity selectively quenched in presence...

The synthesis, characterization, and stability of porphyrin nanoparticles 20−200 nm diameter presented herein is general for meso arylporphyrins. elegance the method lies in its simplicity. This work shows that agent used to prevent agglomeration can be covalently attached dye forming particle or part solvent system. It also demonstrates these other types dyes with a range photonic properties do not need prepared by inclusion external matrices designed self-assembly priori. matrix may...

Twenty-one components self-assemble to form the large (ca. 25 nm2), planar porphyrin arrays of type 1: four dipyridylporphyrins, tripyridylporphyrins, one tetrapyridylporphyrin, and twelve PdCl2 units.

Herein, we demonstrate the controlled formation of two-dimensional periodic arrays ring-shaped nanostructures assembled from CdSe semiconductor quantum dots (QDs). The patterns were fabricated by using an evaporative templating method. This involves introduction aqueous solution containing both and polystyrene microspheres onto surface a planar hydrophilic glass substrate. became confined to meniscus during evaporation, which drove ring assembly via capillary forces at sphere/glass substrate...

Doxorubicin was intercalated into novel zirconium phosphate nano-platelets (ZrP). The obtained doxorubicin ZrP had an impressive 34.9% (w/w) drug loading. We used this material to deliver breast cancer cells (MCF-7). Cellular studies with MCF-7 showed higher uptake and cytotoxicity of loaded compared free doxorubicin.

Solution chemistry methods have been used to synthesize bimetallic CuPt alloy nanoparticle catalysts with controllable sizes and shapes. By variation of the relative ratios oleylamine oleic acid stabilizers, solvent, reduction rate, nanoparticles could be tuned from ∼2 nm spherical particles nanorods diameters ∼2.5 aspect tunable 5:1 25:1. These mixed-metal show excellent catalytic properties for CO oxidation, light-off temperatures that are nearly 200 K below those conventional supported Pt...

We demonstrate the fabrication of amphiphilic nano-sheets, which are either surface- or edge-modified plates with thickness at atomic scale, one thinnest particles reported so far. They obtained by exfoliation functionalized layered crystals, first time that laminar structures have been utilized to produce such particles. Stable emulsions were made utilizing these nano-sheets. The adsorption nano-sheets onto oil-in-water interfaces and reduction surface tension between PDMS nano-sheet...

Aramid nanofibers (ANFs), or nanoscale Kevlar fibers, are of interest for their high mechanical performance and functional nanostructure. The dispersible nature ANFs opens up processing opportunities creating mechanically robust flexible nanocomposites, particularly energy power applications. challenge is to manipulate into an electrode structure that balances electrochemical yield a electrode. Here, graphene oxide (GO) sheets blended using layer-by-layer (LbL) assembly achieve...

Here we present a simple platform for probing plasmon enhanced photoluminescence (PL) of quantum dots by confocal microscopy. In this study, self-assembled monolayers silane-derivative molecules were patterned onto the oxidized GaAs surfaces to direct attachment Au or Ag nanoparticles surface. Following directed binding metal (MNPs), layer-by-layer deposition oppositely charged polymers was used create films with varying thickness controlling numbers deposited layers. CdSe (QDs) ∼4 and 5.5...

A convenient and simple route to functionalized multiwall carbon nanotubes (MWNTs) using the reaction of amine (NH) groups polyethyleneimine (PEI) with MWNTs in N,N-dimethylformamide (DMF) at 50 degrees C is described. The product (MWNT-NH-PEI) contain 6-8% by weight PEI based on elemental analysis, thermal gravimetric titration. products form stable emulsions water below pH 9 can be derivatized alkylated that are dispersible organic media. Such MWNT-NH-PEI nanoparticles also used covalent...

The objective of this study was to evaluate the biocompatibility zirconium phosphate (ZrP) nanoplatelets (NPs), and their use in drug delivery. ZrP doxorubicin-intercalated (DOX:ZrP) NPs were characterized by using X-Ray Powder Diffraction (XRPD), Thermogravimetric Analysis (TGA), Transmission Electron Micrography (TEM), Scanning Microscopy (SEM) Atomic Force (AFM). Biocompatibility evaluated human embryonic kidney (HEK-293), breast cancer (MCF-7), metastatic (MDA-MB-231), ovarian (OVCAR-3),...

Tessellation of nine free-base porphyrins into a 3 × array is accomplished by the self-assembly 21 molecular entities four different kinds, one central, corner, and side with 12 trans Pd(II) complexes, specifically designed targeted intermolecular interactions. Strikingly, 30 components metalloporphyrin nonamer results from addition equivalents first-row transition metal to above milieu. In this case each porphyrin in nonameric coordinates same such as Mn(II), Ni(II), Co(II), or Zn(II). This...

Block copolymer (BC) brush gradient libraries were examined as high-throughput platforms to study the effect of relative block lengths on response solvents. BC brushes poly(n-butyl methacrylate) (PBMA) and poly(2-(N,N'-dimethylamino)ethyl (PDMAEMA) synthesized via surface-initiated atom transfer radical polymerization (ATRP). The had uniform bottom PBMA blocks molecular mass top PDMAEMA blocks. rearrangement upon exposure water hexane was assessed by contact angle (θw) measurements. θw...

Dynamical low-energy electron diffraction analyses of ordered structures NO molecules chemisorbed on Pt(111) and Ni(111) conclusively yield threefold-coordinated hollow-site adsorption, reasonable bond lengths. This invalidates long-standing site assignments based vibrational measurements, calling that approach into question. The results this study also contrast with the lower-coordinated bridge top sites found for CO same metal surfaces. are oriented close to surface normal, O end up.

Pendant groups on polymers that have lower-critical solution temperature (LCST) properties experience a water-like environment below the LCST where polymer is soluble but are less hydrated above when phase separates from solution. When these pendant amphoteric like carboxylate salts or ammonium salts, change in solvation accompanies precipitation event significantly changes groups' acidity basicity. These basicity can lead to forming carboxylic acid by capturing protons bulk solvent...

Nanoscale carbon lubricants such as graphene, have garnered increased interest protective surface coatings for devices, but its tribological properties been shown to depend on interactions with the underlying substrate and degree of conformity. This conformity is especially real interfaces exhibit roughness order ∼10 nm that can dramatically impact contact area between graphene film substrate. To examine combined effects interaction strength frictional a combination Atomic Force Microscopy...

Because of the absence native dangling bonds on surface layered transition metal dichalcogenides (TMDCs), colloidal quantum dots (QDs) TMDCs is exposed directly to solvent environment. Therefore, optical and electronic properties TMDCS QDs are expected have stronger influence from than usual surface-passivated due more direct solvent-QD interaction. Study such effect has been difficult in TMDC large spectroscopic heterogeneity resulting lateral size or (and) thickness ensemble. Here, we...

Heterojunctions of semiconductors and metals are the fundamental building blocks modern electronics. Coherent heterostructures between dissimilar materials can be achieved by composition, doping, or heteroepitaxy chemically different elements. Here, we report formation coherent single-layer 1H-1T MoS2 mechanical exfoliation on Au(111), which homogeneous with matched lattices but show electronically distinct semiconducting (1H phase) metallic (1T character, these heterojunctions attributed to...

The performance of electrochemical devices using ionic liquids (ILs) as electrolytes can be impaired by water uptake. This work investigates the influence on behavior hydrophilic and hydrophobic ILs─with ethylsulfate tris(perfluoroalkyl)trifluorophosphate or bis(trifluoromethyl sulfonyl)imide (TFSI) anions, respectively─on electrified graphene, a promising electrode material. results show that uptake slightly reduces IL stability significantly influences graphene's potential zero charge,...