The miscibility and phase behavior of two stereoisomer forms poly(lactide) (PLA: poly (L-lactide) (PLLA) poly(DL-lactide) (PDLLA)) blends with poly(epsilon-caprolactone)-b-poly(ethylene glycol) (PCL-b-PEG) PCL-b-monomethoxy-PEG (PCL-b-MPEG) block copolymers have been investigated by differential scanning calorimetry (DSC). DSC thermal both the blend systems revealed that PLA is miscible PEG segment PCL-b-(M)PEG but still immiscible its PCL although was block-copolymerized PEG. On basis these...

We report a precise control over the hierarchy levels in outstanding self-organization process shown by chiral azobenzene dimer 1. This compound forms uniform toroidal nanostructures that can hierarchically organize into nanotubes under temperature, concentration, or light. The further organized supercoiled fibrils, which finally intertwined to form double helices with one-handed helical sense.

Regioisomers of self-assembling molecules resulted in the evolution distinct 0D and 1D nanostructures, namely nanorings nanorods (see picture). J- H-type excitonic coupling naphthalene chromophores was found nanostructures. The bulk liquid-crystalline states contain hydrogen-bonded rosettes, which explains how observed regioisomers generate nanostructures with characteristic interactions. Detailed facts importance to specialist readers are published as "Supporting Information". Such...

Perylene 3,4:9,10-tetracarboxylic acid bisimide (PBI) was functionalized with ditopic cyanuric to organize it into complex columnar architectures through the formation of hydrogen-bonded supermacrocycles (rosette) by complexing melamines possessing solubilizing alkoxyphenyl substituents. The aggregation study in solution using UV-vis and NMR spectroscopies showed extended aggregates hydrogen-bonding π-π stacking interactions. cylindrical fibrillar nanostructures were visualized microscopic...

Photomelting of azobenzene is a phenomenon that typically achieved by UV-light irradiation. However, many applications based on photomelting, including the solar thermal fuel (STF) application, require responsiveness to visible light. Therefore, in this study, we designed and synthesized several derivatives melt under visible-light irradiation explored their potential application as STFs. By combining molecular design elements endow with visible-light-responsiveness (ortho-halogen)...

Regime transitions of poly[(S)-lactide] (PLA) crystal growth from the melt were investigated by studying morphological changes and carrying out kinetic analysis using microscopic techniques. PLA thin films with an average layer thickness 100 nm isothermally crystallized at a given crystallization temperature after melting 220 °C. Following isothermal below 145 °C, uniform two-dimensional spherulites having stacked flat-on lamellar texture developed throughout films. On basis electron...

Nanodonuts! A hydrogen-bonded cyclic assembly (rosette, left) of a melamine featuring π-conjugated oligo(p-phenyleneethynylene) hierarchically self-organizes with cyanurate in decane under dilute conditions to form toroidal nanostructures (right) diameter 40 nm. Supporting information for this article is available on the WWW http://www.wiley-vch.de/contents/jc_2002/2008/z800417_s.pdf or from author. Please note: The publisher not responsible content functionality any supporting supplied by...

Several proteins, such as tobacco mosaic virus coat protein and the beta of bacteriophage lambda, are known to exhibit unique dynamic self-organization processes involving ring-shaped extended helical nanostructures triggered by chemical stimuli. However, transformation rings into coils observed in biological assemblies has never been realized with synthetic molecular building blocks. Oligo(p-phenylenevinylene) functionalized on one end barbituric acid other aliphatic tails self-organizes...

Poly(l-lactide) (PLLA) thin film with 100 nm thickness was crystallized at 160 °C for 20 min from the melt obtained 220 °C. Hexagonal crystals three types of growth (derivative lamellae, overgrowth multistacked and undergrowth lamellae) were simultaneously observed by atomic force microscopy (AFM). These phenomena are due to differences formative points secondary crystal nuclei against basal lamella. Enzymatic degradation PLLA revealed two amorphous regions. regions identified as free region...

Enzymatic degradation of the poly(l-lactide) (PLLA) amorphous film by proteinase K has been investigated combination complementary techniques quartz crystal microbalance and atomic force microscopy (AFM). The erosion rate increased with increasing enzyme concentrations attained to be constant under condition [proteinase K] > 100 μg/mL. amount molecules adsorbed was quantitatively evaluated at various AFM, it revealed that is determined enzyme. Adsorption irreversible despite lack binding...

It's all in the packing: Self-assembly of title system through hydrogen bonding and then aggregation led to vesicle formation, capping hydrogen-bonding moieties with subsequent ribbons. The resulting self-assembled architectures exhibit distinct optical electronic properties. Detailed facts importance specialist readers are published as ”Supporting Information”. Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted by authors. Please note: publisher is...

Discotic supramolecular complexes bearing six perylene bisimide (PBI) chromophores were prepared by mixing monotopically triple-hydrogen-bonding melamines equipped with two PBI and 3,7-dimethyloctyl chiral handles tritopically cyanuric acid (CA). UV/Vis fluorescence titration experiments demonstrated that the discotic formed in methylcyclohexane 3:1 complexation between CA. TEM AFM studies revealed hierarchically organize into fibrous columnar assemblies, which eventually results formation...

Abstract A simple protocol to create nanofibers and ‐rings through a rational self‐assembly approach is described. Whereas the melamine–oligo( p ‐phenylenevinylene) conjugate 1 self‐aggregates form ill‐defined nanostructures, b , which possesses an amide group as additional interactive site, 1D that induce gelation of solvent. AFM XRD studies have shown dimerization melamine–melamine hydrogen‐bonding interaction occurs only for . Upon complexation with 1/3 equivalents cyanuric acid (CA),...

Diarylethene 1 equipped with two monotopic melamine hydrogen-bonding sites and oligothiophene-functionalized ditopic cyanurate (OTCA) were mixed in a nonpolar solvent to form AA-BB-type supramolecular co-polymers (SCPs) bearing photoswitchable moieties their main chains extended π systems as side chains. UV/Vis, fluorescence, dynamic light scattering (DLS), TEM, AFM studies revealed that the functional co-monomers formed flexible quasi-one-dimensional SCPs solution hierarchically...

Abstract Supramolecular rosettes of oligothiophenes that do not bear long aliphatic tails have been designed as semiconducting nanomaterials for solution‐processable bulk heterojunction solar cells. The consist six barbiturated thienyl[oligo(hexylthiophene)] units (Bar‐T‐hT n ; =3,4,5) aggregated by multiple hydrogen bonds, which directly visualized scanning tunneling microscopy (STM) at a solid–liquid interface. 1 H NMR spectroscopy in [D 8 ]toluene showed Bar‐T‐hT exists mixture monomers...

Abstract The design of molecular systems with high-fidelity self-assembly pathways that include several levels hierarchy is primary importance for the understanding structure-function relationships, as well controlling functionality organic materials. Reported herein a system comprises two hydrogen-bonding semiconductors regioisomerically attached short alkyl chains. Despite availability both discrete cyclic and polymeric linear motifs, regioisomers select one motifs in homogeneous solution...

A new strategy for bacterial polyhydroxyalkanoate (PHA) production by recombinant Ralstonia eutropha PHB(-)4 harboring mutated PHA synthase genes (phaC(Ac)) from Aeromona caviae was investigated. The strain wild-type phaC(Ac) gene produced a copolymer consisting of (R)-3-hydroxybutyrate and (R)-3-hydroxyhexanoate [P(3HB-co-3HHx)] with 3.5 mol-% 3HHx fraction soybean oil. When the mutants were applied to this system, in copolymers varied range 0-5.1 mol-%. Thus, regulation compositions has...

Abstract Summary: Eleven laboratory‐evolved polyhydroxyalkanoate (PHA) synthases which originated from Pseudomonas sp. 61‐3 enzyme (PhaC1 Ps ), together with the wild‐type enzyme, were applied for PHA synthesis fructose using Ralstonia eutropha PHB ‐ 4 as a host strain. The evolved PhaC1 mutants had amino acid substitution(s) at position 325 and/or 481. In these mutants, serine‐325 (S325) was replaced by cysteine (C) or threonine (T), while glutamine‐481 (Q481) lysine (K), methionine (M)...

Nanodonuts: Die hierarchische Selbstorganisation eines Melaminderivats mit π-konjugierten Oligo(p-phenylenethinylen)-Substituenten einem Cyanurat führt in verdünnter Decanlösung zu wasserstoffverbrückten cyclischen Rosetten (links), die sich toroidalen Nanostrukturen (rechts) 40 nm Durchmesser zusammenlagern.

An oligo(p-phenylenevinylene) (OPV) dimer, whose OPV units are capped on their end by monotopic melamine hydrogen-bonding units, self-assembles in methylcyclohexane to form flexible fibrous nanostructures, which transformed into rigid nanostrips upon adding ditopic cyanurates and reconverted nanofibers a m-xylylene-linked bismelamine.

Understanding the interactions between adsorbate and substrate is critical in basic advanced scientific fields, including formation of well-organised nanoarchitectures via self-assembly on surfaces. In this study, n-alkanes n-perfluoroalkanes with circumcoronene were studied using dispersion-corrected density functional theory calculations as models their adsorption graphite. The significantly weaker than those corresponding n-alkanes, e.g. calculated energies n-perfluorohexane n-hexane...

The crystallization behavior and crystalline morphologies of poly[(S)-lactide] (P[(S)-LA]) in thin films crystallized isothermally at over 160 °C were characterized by transmission electron microscopy atomic force (AFM). dendritic crystal hexagonal formed film with thicknesses below 30 nm or 50 nm, respectively. structures crystals identical, suggesting that the morphology P[(S)-LA] is strongly dependent upon thickness. In situ observation growth 165 from melt was carried out using...