Scalable production of magnetic fluorescent cellulose microparticles

Abstract

Recently, semitransparent luminescent solar concentrators (LSCs) have attracted a considerable attention 18 because they offer an easy and cost-effective route to harvest incident light. Various fluorophores including 19 semiconducting quantum dots and organic dyes have been prepared and utilized for LSC fabrication. 20 However, the narrow light absorption range, reabsorption losses, and limited photostability of the 21 fluorophores still hinder the widespread use of LSCs under outdoor and indoor light conditions. Here, we 22 rationally designed an LSC utilizing aggregation-induced emissive fluorophores (AIEgens) and an energy 23 transfer strategy. We employ diketopyrrolopyrrole with triphenylamine moiety as a highly stable AIEgen 24 that functions as an emissive energy-transfer acceptor in LSC; for a donor, we use tetraphenylethene 25 containing triphenylamine moiety that shows good aggregation-induced emission features and excellent 26 spectral overlap with the acceptor to yield an efficient energy transfer process. A thin-film LSC device with 27 an optimized donor : acceptor ratio (1 : 0.5) was fabricated. Under AM 1.5G solar spectrum, an LSC coupled 28 with three side reflectors and a backside diffuser exhibits 18% optical conversion efficiency and a 29 concentration factor of 1.18. Under indoor white LED illumination, the values were 27% and 1.68, 30 respectively. After exposed to intense UV radiations for 5 hours, the LSCs preserved 98% fluorescence 31 which suggests their superior long-term photostability. Our results suggest that the combination of AIEgens 32 and energy transfer holds the potential for enhancing the efficiency of the device and extended stability of 33 the fluorophores, two of the major requirements to allow industrial production and large-scale use of 34 outdoor/indoor light harvesting LSCs.

Cobalt Ferrite Particles Produced by Sol-Gel Autocombustion and Embedded in Polysilane: An Innovative Route to Magnetically-Induced Fluorescence Composites

“…In this context, magnetic (nano)particles (MNPs) represent a very attractive category of materials that can induce new properties to their composites, such as magnetic susceptibility and the possibility of manipulation under an external field [ 31 , 32 , 33 ]. Usually, MNPs perform the role of transport vectors and their response capacity under the action of magnetic field is influenced by their magnetic properties, in accordance with their chemical composition and structure (pure metallic MNPs, metal oxide MNPs, and alloy MNPs) [ 34 , 35 , 36 ].…”

Multifunctional Electrospun Nanofibers Based on Biopolymer Blends and Magnetic Tubular Halloysite for Medical Applications

“…The ideal procedure for magnetic modification of diamagnetic materials should be inexpensive, easy to perform, scalable, and tuneable, leading to a stable magnetic product, both in dry state and water suspension [10]. Gentle modification procedures are based on the deposition of magnetic iron oxide or ferrite nano-or microparticles on the surfaces or within the pores of the treated biomaterials, e.g., using an appropriate magnetic fluid [11].…”