ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTDirect Evidence for Vertical Diffusion and Exchange Processes of Polyanions Polycations in Polyelectrolyte Multilayer FilmsPhilippe Lavalle, Valérie Vivet, Nadia Jessel, Gero Decher, Jean-Claude Voegel, Philippe J. Mesini, Pierre SchaafView Author Information Institut National de la Santé Et Recherche Médicale Unité 595, Faculté Chirurgie Dentaire, Université Louis Pasteur, 11 rue Humann, F-67085 Strasbourg Cedex, France; Charles Sadron Centre...

A perylene bisimide organogelator is shown to behave as a reversible stimuli responsive material: thermal annealing and contact with organic non solvents allow switch back forth between green J-type (Form I) red H-type II) aggregate in thin films powders of <italic>N</italic>,<italic>N</italic>′-substituted H-bonding perylenebisimide (PBI-C10).

We report the covalent layer-by-layer construction of polyelectrolyte multilayer (PEM) films by using an efficient electrochemically triggered Sharpless click reaction. The reaction is catalyzed Cu(I) which generated in situ from Cu(II) (originating dissolution CuSO4) at electrode constituting substrate film. film buildup can be controlled application a mild potential inducing reduction to absence any reducing agent or ligand. experiments were carried out electrochemical quartz crystal...

Hydrogen bonding and π–π interactions are the driving forces for self-assembly of a diamide organogelator into nanotubes in organic solution. Freeze-fracture electron microscopy (see image) small angle neutron scattering studies show tubes have diameter (24.2±0.3) nm with wall thickness (3.3±0.4) an aspect ratio 1:50 or higher. Supporting information this article is available on WWW under http://www.wiley-vch.de/contents/jc_2002/2005/z500536_s.pdf from author. Please note: The publisher not...

The impact of H-bonding on the optoelectronic properties and device morphology diketopyrrolopyrrole derivatives is reviewed.

In this paper, we investigate the design of antifouling surfaces by deposition polyelectrolytes modified grafting groups onto a (PSS/PAH)n precursor multilayer film [PSS, poly(styrenesulfonate); PAH, poly(allylamine)]. Different and different moieties are investigated, in particular, (EO)3 (EO)3PC (EO, ethylene oxide; PC, phosphorylcholine group). We find that protein adsorption can strongly be reduced even practically suppressed through only one layer polyelectrolyte with PC and/or groups....

The synthesis and examination of two unique classes duocarmycin SA analogs are described which we refer to as reversed sandwiched analogs. Their established both the origin DNA alkylation selectivity that enantiomers this class natural products subject same polynucleotide recognition features. most beautiful demonstration is complete switch in enantiomeric only consistent with noncovalent binding model incompatible site models selectivity. In addition, dramatic alterations rates were...

In iron-deficient conditions, Pseudomonas aeruginosa secretes a major fluorescent siderophore named pyoverdin (Pvd), which after chelating iron(III) is transported back into the cell via its outer membrane receptor FpvA. FpvA TonB-dependent transport protein and has ability to bind Pvd in apo- or iron-loaded form. The fluorescence properties of were used determine binding kinetics metal-free metal-loaded showed two features. First, formation FpvA-Pvd complex, vivo vitro, are markedly slower...

Self-assembled helices were used as templates to form helical mesopores in a polymeric matrix. The template was formed from the self-association of 3,5-bis(5-hexylcarbamoylpentyloxy)benzoic acid decyl ester ethylene glycol diacrylate. monomer photopolymerized, and resulting resin extracted remove template. shape pores proven by TEM tomographic studies. ability material with high specific areas using tubular same molecules also shown.

Cell adhesion processes take place through mechanotransduction mechanisms where stretching of proteins results in biological responses. In this work, we present the first cyto-mechanoresponsive surface that mimics such behavior by becoming cell-adhesive exhibition arginine-glycine-aspartic acid (RGD) peptides under stretching. This mechanoresponsive is based on polyelectrolyte multilayer films built a silicone sheet and RGD-grafted polyelectrolytes are embedded antifouling...

Hydrogen bonds can efficiently guide the self-assembly of organic materials, enabling to tune properties aggregation processes. In case π-conjugated several parameters such as temperature, concentration and solvent be used modify state while tuning optoelectronic properties. Chirality included within impacting due differences in molecular packing. Here, chiral achiral thiophene-capped diketopyrrolopyrrole derivatives were designed synthesized containing amide bonds, with aim study interplay...

This article describes self-assembly of supramolecularly engineered naphthalene-diimide (NDI)-derived amphiphiles NDI-1 and NDI-2. They have the same hydrophobic/hydrophilic balance but merely differ by a single functional group, amide or ester. exhibit distinct in water; forms hydrogel, which upon aging crystals, whereas NDI-2 micelles as revealed in-depth structural analysis using cryo-TEM, dynamic light scattering, small-angle X-ray scattering studies. These results suggest that H-bonding...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical and Structural Comparison of N-BOC-CBQ N-BOC-CBI: Identification Origin an Unappreciated but Productive Stability the CC-1065 Duocarmycin SA Alkylation SubunitsDale L. Boger, Philippe Mesini, Christine M. TarbyCite this: J. Am. Chem. Soc. 1994, 116, 14, 6461–6462Publication Date (Print):July 1, 1994Publication History Published online1 May 2002Published inissue 1 July...

A surface coating based on polyelectrolyte multilayers containing phosphorylcholine modified poly(acrylic acid) (PAA-PC) is shown to strongly prevent protein adsorption even under mechanical stretching of the substrate.

We investigate the anti-fouling properties of polyelectrolyte multilayers bearing phosphorylcholine and triethylene glycol moieties their adhesive response under stretching towards mammalian cells fungi. More precisely we use a precursor multilayer deposited on glass an elastomeric silicone sheet onto which one or two layers polyacrylic acid modified with groups are added. In previous studies, these architectures proved to be resistant protein adsorption (A. Reisch, J. C. Voegel, E....

Binary c–T phase diagrams of organogelators in solvent are frequently simplified to two domains, gel and sol, even when the melting temperatures display distinct regimes, an increase with T a plateau. Herein, diagram organogelator is elucidated by rheology, DSC, optical microscopy, transmitted light intensity measurements. We evidence miscibility gap between above threshold concentration, cL. In this domain or formation becomes monotectic transformation, which explains why corresponding...

Hydrogen bonds are noncovalent interactions able to improve the electronic properties of self-assembled semiconductors. Nevertheless, it is necessary control parameters influencing formation hydrogen achieve hierarchical structures with enhanced properties. In this work, we explore two hydrogen-bonded thiophene-capped diketopyrrolopyrrole (DPP) derivatives containing amides different topology (C- or N-centered) and compare them a analogue without bonds. We demonstrate differences in...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDesign, Synthesis, and Evaluation of CC-1065 Duocarmycin Analogs Incorporating the 2,3,10,10a-Tetrahydro-1H-cyclopropa[d]benzo[f]quinol-5-one (CBQ) Alkylation Subunit: Identification Structural Origin Subtle Stereoelectronic Features That Govern Reactivity RegioselectivityDale L. Boger Philippe MesiniCite this: J. Am. Chem. Soc. 1994, 116, 25, 11335–11348Publication Date (Print):December 1, 1994Publication History Published online1 May...

This paper examines the possibility of sheathing polymer nanofibrils, prepared from a thermoreversible gel, by nanotubules, obtained through self-assembly complex ester. The method for preparing this hybrid system consists cooling ternary solutions until gelation is achieved. mechanism most probably occurs heterogeneous nucleation: fibrils act as nuclei, and so trigger growth nanotubules around them. occurrence process investigated DSC, AFM, SAXS SANS. In latter case, contrast variation used.

Cu(I)-catalyzed azide−alkyne [3 + 2] cycloaddition is used to construct step-by-step covalent polymer or polyelectrolyte multilayers. The catalysis involves the formation of a transient, yet rather stable, positively charged Cu(I)/alkyne complex. We demonstrate that this complex has strong influence on multilayer buildup process. It favors, for example, film between neutral bearing alkyne groups and polyanion azide groups. In contrary, it disfavors same with polycations constructions other...

The monodisperse oligoamides 1, 2, 3, and 4 have been tested as organic gelators. It was found that gelation occurs only above a critical degree of oligomerization is, for the trimer 3 tetramer 4, in aromatic solvents. Thermotropic rheological properties gels are reported. an elastic shear modulus 1 order magnitude lower than gels. A structural study has conducted by transmission electron microscopy.