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An acid/base responsive amphiphilic [2]rotaxane switch containing a hydrophilic macrocycle component and a hydrophobic terminal bulky group was prepared and characterized. The morphology of the supramolecular assemblies formed by the rotaxanes could be switched between spherical vesicles and worm-like micelles using acid/base stimuli, as confirmed by transmission electron microscopy (TEM).
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http://dx.doi.org/10.1039/c7cc05008a | DOI Listing |
Phys Rev Lett
August 2025
Nanjing University of Aeronautics and Astronautics, State Key Laboratory of Mechanics and Control for Aerospace Structures and Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of Education, Institute of Nano Science, Nanjing, 210016, China.
Multistate ferroelectric polarization holds promise for realizing high-density nonvolatile memory devices, but so far is restricted to a few traditional ferroelectrics. Here, we show that nanoconfined two-dimensional (2D) ferroelectric ice can achieve phase-dependent multistate polarization through extensive classical and ab initio molecular dynamics simulations. An in-plane electric field is found to induce the reversible transition between a low-polarization AA-stacked hexagonal ice phase and an unprecedented high-polarization AB-stacked ice phase, resulting in a four-state ferroelectric switching pathway.
View Article and Find Full Text PDFJ Org Chem
September 2025
Department of Organic Chemistry, University of Chemical Technology and Metallurgy, 8 St. Kliment Ohridski blvd, Sofia 1756, Bulgaria.
Herein, a novel class of azo photoswitches based on a phthalimide with an azo bond to the imide ring is presented, exhibiting reversible isomerization under a broad range of visible light irradiation from 405 to 530 nm. Structural variations with heteroaryl or aryl segments attached to the 3-phthalylazo unit exhibit distinct spectral features, such as red-shifted absorption, well-separated absorption bands, and tunable stability of the metastable isomer, ranging from seconds to days. They differ drastically in the half-life of -isomer stability, ranging from several seconds (-methylpyrrole) to days (-methylimidazole).
View Article and Find Full Text PDFAngew Chem Int Ed Engl
September 2025
State Key Laboratory of Advanced Drug Delivery and Release Systems, Institute of Pharmaceutics, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, 310058, China.
Photo-responsive systems provide a powerful tool to reversibly regulate enzyme activity. However, inhibitor-based strategies, though widely used, are often restricted to specific enzymes. Noninhibitor strategies, such as enzyme surface modification or genetic mutation, often compromise structural integrity or residual activity.
View Article and Find Full Text PDFAdv Mater
September 2025
College of Physics, Donghua University, Shanghai, 201620, China.
The 180° switching of the perpendicular Néel vector induced by the spin-orbit torque (SOT) presents significant potential for ultradense and ultrafast antiferromagnetic SOT-magnetoresistive random-access memory. However, its experimental realization remains a topic of intense debate. Here, unequivocal evidence is provided for the SOT-induced 180° switching of the perpendicular Néel vector in collinear antiferromagnetic CrO in a Pt/CrO/Co trilayer structure.
View Article and Find Full Text PDFACS Appl Mater Interfaces
September 2025
Advanced Materials Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China.
Improving electrostrain in lead-free piezoelectric materials is critical for practical use. This study examines KTN crystals and employs two primary strategies to enhance their electrostrain: (1) Cu doping creates a restoring force enabling reversible domain switching. (2) Polarizing Cu:KTN crystals and applying an electric field perpendicular to the polarization direction ensure that all domains contribute to the strain.
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