In this paper, self-assembled polymeric toroids formed by a temperature-driven process are reported. Rhodamine B (RhB) end-capped poly(N-isopropylacrylamide) (PNIPAAm) demonstrating a lower critical solution temperature (LCST) is prepared. In a two-phase system, the polymer in the aqueous phase could move to the chloroform phase on raising the temperature above its LCST. This temperature-driven process results in the formation of polymeric toroids in the chloroform phase, and the strategy affords a new pathway to toroidal self-assembly of polymers. Moreover, the photoluminescent behavior of the RhB end-capped PNIPAAm species formed by the process is also studied and discussed.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/marc.201300038 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Topology changes of define actin orientation defects as organizers of morphogenesis.
Sci Adv
January 2025
Department of Biochemistry, Université de Genève, CH-1211 Genève, Switzerland.
regenerates one head when cut, but how forces shaping the head are coordinated remains unclear. Soft compression of 's head-regenerating tissues induces the formation of viable, two-headed animals. Compression creates new topological defects in the supracellular orientational order of muscular actin fibers, associated with additional heads.
View Article and Find Full Text PDFOutflows from Naked Singularities, Infall through the Black Hole Horizon: Hydrodynamic Simulations of Accretion in the Reissner-Nordström Space-Time.
Phys Rev Lett
December 2024
Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences, Bartycka 18, 00-716 Warsaw, Poland.
We performed the first simulations of accretion onto the compact objects in the Reissner-Nordström (RN) space-time. The results obtained in general relativity are representative of those for spherically symmetric naked singularities and black holes in a number of modified gravity theories. A possible application of these calculations is to the active galactic nuclei with their powerful jets and outflows.
View Article and Find Full Text PDFA Crystalline NiX Complex.
J Am Chem Soc
December 2024
Chemistry Research Laboratory, Department of Chemistry, Oxford OX1 3TA, U.K.
High-valent nickel species are implicated as intermediates in industrially relevant chemical transformations and in the catalytic cycles of metalloenzymes. Although a small number of tetravalent NiX complexes have been crystallographically characterized, higher nickel valence states have not been identified. Here we report a stable, crystalline NiX complex, Ni(BeCp) (; cyclopentadienyl anion (Cp)), formed by the insertion of zerovalent nickel into three Be-Be bonds.
View Article and Find Full Text PDFExtension of sticholysins N-terminal α-helix signals membrane lipids to acquire curvature for toroidal pore formation.
Biochem Biophys Res Commun
January 2025
Center of Protein Studies, Faculty of Biology, Havana University, Havana, Cuba.
Sticholysin I and II (St I/II) belong to the actinoporins family; these proteins form pores in host cell membranes by binding their N-terminal segment to the membrane, leading to protein-lipid (toroidal) pores. Peptides derived from actinoporins pore-forming domains replicate their folding properties and permeabilizing effects. Despite the advances in understanding how these proteins and peptides mediate pore formation, the role of different N-terminal segments in inducing membrane curvature is still unclear.
View Article and Find Full Text PDFSynthetic measurements of runaway electron synchrotron emission in the SPARC tokamak.
Rev Sci Instrum
November 2024
Commonwealth Fusion Systems, Devens, Massachusetts 01434, USA.
With plasma currents up to 8.7 MA, the SPARC tokamak runs the risk of forming multi-MA beams of relativistic "runaway" electrons (REs), which could damage plasma facing components if unmitigated. The infrared (IR) and visible imaging and visible spectroscopy systems in SPARC are designed with measurements of synchrotron emission from REs in mind.
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!