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The porous nature and structural variability of covalent organic frameworks (COFs) make them preferred for drug loading and delivery applications. However, most COF materials suffer from poor luminescent properties and inefficiency for cell uptake. Herein, we experimentally demonstrate the crucial role of long alkoxy chains in the synthesis of crystalline COF nanostructures with high cellular uptake efficiency. After luminescence integration through band engineering, the semiconducting COF exhibits an optical bandgap of 2.05 eV, an emission wavelength of 632 nm, a high quantum yield of 37 %, and excellent fluorescence stability (100 % at 3 h). Such excellent optical properties of the designed COF nanocarriers enable quantitative evaluations of cellular uptake and visual tracking of drug delivery. It was demonstrated that the cellular uptake efficiency was enhanced by orders of magnitude for the COF after the introduction of long n-octyloxy chains, which firstly delivered the anticancer ....
Anushka Khanna returns with 'Luminescence', a vibrant bridal collection challenging traditional pastels with a kaleidoscope of colors and contemporary ....
Scientists at the University of Birmingham in collaboration with scientists from the Bundesanstalt für Materialforschung und -prüfung (BAM) have developed a new approach for detecting pollution fr . ....
Luminescence rock surface burial and exposure dating approaches hold enormous potential to contribute to the archaeological sciences. These methods enable the dating of previously undatable archaeological site types and can be used to determine how and when lithic artefacts have been sequentially buried and transported. Studies have already used these approaches to overcome limitations of classical dating methods to constrain the ages of lithic artefact discard and post-depositional movement at surface scatter sites, to chronologically constrain rock art production by dating rockfall and exposure events, as well as dating a variety of rock-based archaeological features such as pavements, petroforms, megalithic structures, and walls. Here, we present a review of these developing methods, including an introduction to the underlying principles and applications, a series of case studies, and a discussion of the obstacles and complexities to be considered when applying these methods. We con ....