Molecular self-assembly primarily occurs in solution. To better understand this process, techniques capable of probing the solvated state are consequently required. Small-angle scattering (SAS) has a proven ability to detect and characterize solutions, but it is rarely applied to more complex assembly shapes. Here, small-angle X-ray and neutron scattering are applied to observe toroidal assemblies in solution. Combined analysis confirms that the toroids have a core-shell structure, with a π-conjugated core and an alkyl shell into which solvent penetrates. The dimensions determined by SAS agree well with those obtained by (dried-state) atomic force microscopy. Increasing the number of naphthalene units in the molecular building block yields greater rigidity, as evidenced by a larger toroid and a reduction in solvent penetration into the shell. The detailed structural analysis demonstrates the applicability of SAS to monitor complex solution-based self-assembly.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/anie.201603370 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Phase Diagram, Glassy Dynamics and Crystallization Kinetics of the Biobased Polyester Poly(ethylene 2,5-furanoate) (PEF).
Macromolecules
December 2024
Department οf Physics, University οf Ioannina, Ioannina 45110, Greece.
We report the pressure-temperature (-) phase diagram, the origin of the subglass dynamics, and the crystallization kinetics of the biobased polyester poly(ethylene 2,5-furanoate) (PEF), through dielectric spectroscopy (DS) measurements performed as a function of temperature and pressure. The phase diagram comprises four different "phases"; glass, quenched melt, crystalline, and normal melt. The cold crystallization temperature, , increases linearly with pressure (according to the Clausius-Clapeyron equation) as / ∼ 240 K·GPa and is accompanied by a small change in specific volume (Δ = 0.
View Article and Find Full Text PDFKapok fibers modified with cationic surfactants: Structural insights and efficient removal of Cr(VI) and bisphenol A.
J Colloid Interface Sci
December 2024
Institute of Chemistry, University of São Paulo, Av. Prof. Lineu Prestes 748, São Paulo 05508-000, Brazil. Electronic address:
In this study, kapok fiber (KF) a hollow and hydrophobic fiber, was modified with cetyltrimethylammonium bromide (CTAB) or cetylpyridinium chloride (CPC), rendering adsorbed amount of ∼0.75 × 10 mol/g. Small-angle X-ray scattering (SAXS) measurements of dry KF/CTAB and KF/CPC evidenced a periodic distance of ∼2.
View Article and Find Full Text PDFPropagation of Orientation Across Lengthscales in Sheared Self-Assembling Hierarchical Suspensions via Rheo-PLI-SAXS.
Adv Sci (Weinh)
December 2024
Department of Industrial and Materials Science, Division of Engineering Materials, Chalmers University of Technology, Gothenburg, SE-412 96, Sweden.
Simultaneous rheological, polarized light imaging, and small-angle X-ray scattering experiments (Rheo-PLI-SAXS) are developed, thereby providing unprecedented level of insight into the multiscale orientation of hierarchical systems in simple shear. Notably, it is observed that mesoscale alignment in the flow direction does not develop simultaneously across nano-micro lengthscales in sheared suspensions of rod-like chiral-nematic (meso) phase forming cellulose nanocrystals. Rather, with increasing shear rate, orientation is observed first at mesoscale and then extends to the nanoscale, with influencing factors being the aggregation state of the hierarchy and concentration.
View Article and Find Full Text PDFLow-frequency Raman spectroscopy as a new tool for understanding the behaviour of ionisable compounds in dispersed mesophases.
J Colloid Interface Sci
December 2024
Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen 2100, Denmark; Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Parkville 3052, VIC Australia. Electronic address:
Hypothesis: Low-frequency Raman (LFR) spectroscopy is proposed as a novel non-destructive methodology to probe pH-related phase transitions in self-assembled lipid particles. In this case, dispersed lipid mesophases were composed of ionisable oleic acid (OA) or nicergoline (NG) in monoolein (MO). The sensitivity of LFR spectroscopy to low-energy intermolecular vibrations was hypothesised to be due to structural transformation in ionisable dispersed mesophases upon changes in pH.
View Article and Find Full Text PDFThe swelling behaviour of hair studied through the structural change of keratin protein during the permanent waving treatment.
Biophys Chem
November 2024
College of Science and Technology, Nihon University, 1-8-14 Kanda-surugadai, Chiyoda-ku, Tokyo 101-8308, Japan.
Filament of human hair is formed from α-keratin protein and its physical property is predominantly dominated by the structure of microfibril (also known as intermediate filaments (IF)). It is known that human hair is swollen by permanent waving (pw) treatment which consists of the reducing process and following oxidizing process, but a detail in the swelling behaviour remains still unclarified. The present work was devoted to the analysis of the swelling behaviour of hair through the structural change of IF during pw treatment, where 1.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!