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pH-Responsive nanotubes from asymmetric cyclic peptide-polymer conjugates.
Chem Sci
December 2024
Department of Chemistry, University of Warwick Coventry CV4 7AL UK
Self-assembling cyclic peptide nanotubes are fascinating supramolecular systems with promising potential for various applications, such as drug delivery, transmembrane ionic channels, and artificial light-harvesting systems. In this study, we present novel pH-responsive nanotubes based on asymmetric cyclic peptide-polymer conjugates. The pH response is introduced by a tertiary amine-based polymer, poly(dimethylamino ethyl methacrylate) (pDMAEMA) or poly(diethylamino ethyl methacrylate) (pDEAEMA) which is protonated at low pH.
View Article and Find Full Text PDFMolecular structure data and modelling roadmap for optimized oxidized graphene quantum dot and epoxy interface and mechanical properties.
Data Brief
December 2024
San Jose State University, 1 Washington Sq., San Jose, CA 95192, United States.
Hybrid epoxy composites are highly considered for low-density applications due to the excellent specific strength and specific stiffness. Enhancements made to the epoxy matrix by addition of nanofillers like carbon nanotubes (CNTs) and graphene (GNPs) have been studied in detail over the course of few decades. These enhancements not only help elevate the material properties of the matrix but also activate different failure mitigating mechanisms in the composite.
View Article and Find Full Text PDFMetal Ion-Mediated Supramolecular Nanotube Catalyst for Enantioselective Reactions.
Langmuir
December 2024
School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China.
Rational control over the morphologies of supramolecular assemblies for asymmetric catalysis with enhanced enantioselectivity represents a pivotal challenge in the realm of synthetic chemistry and material technology. Herein, Cu(II) ion-mediated supramolecular nanostructures assembled from chiral amino acid-based amphiphiles (l/d-AlaC) are fabricated as chiral catalysts for Diels-Alder cycloaddition between aza-chalcone and cyclopentadiene. In particular, compared with the supramolecular nanosheet formed by l/d-AlaC without Cu(II) ions, we found that the l/d-alanine chiral amphiphile can form supramolecular nanotubes with a multilayer structure and with the thickness of the tubular wall about 15 nm through the transition from a nanoribbon to tubular structure in the presence of Cu(II) ions.
View Article and Find Full Text PDFSelf-assembled rosette nanotubes from tetra guanine-cytosine modules.
Nanoscale Adv
December 2024
Department of Chemistry, University of Alberta 11227 Saskatchewan Drive Edmonton Alberta T6G 2G2 Canada.
Self-assembly of small molecules into supramolecular architectures is a sustainable alternative to new advanced material design. Herein, the design and synthesis of a self-assembling system containing four covalently linked hybrid guanine and cytosine (G∧C) units that were connected through bifunctional amines are reported. These tetra G∧C motifs were characterized and self-assembled in water and methanol to produce discrete nanostructures.
View Article and Find Full Text PDFReversible Circularly Polarized Luminescence Inversion and Emission Color Switching in Photo-Modulated Supramolecular Polymer for Multi-Modal Information Encryption.
J Am Chem Soc
December 2024
Shanghai Key Laboratory of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Advanced Research Institute, Tongji University, Shanghai 200092, P. R. China.
Constructing circularly polarized luminescence (CPL) materials that exhibit dynamic handedness inversion and emissive color modulation for multimodal information encryption presents both a significant challenge and a compelling opportunity. Here, we have developed a pyridinethiazole acrylonitrile-cholesterol derivative (Z-PTC) that exhibits wavelength-dependent photoisomerization and photocyclization, enabling dynamic handedness inversion and emissive color modulation in supramolecular assemblies with decent CPL activity. Coordination with Ag ions form the Z-PTC Ag supramolecular polymer (SP), which assembles into nanotubes displaying enhanced positive yellow-green CPL.
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