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Facile and one-step preparation carbon quantum dots from biomass residue and their applications as efficient surfactants
摘要： Using biomass residue as a source of carbon precursors, a pyrolysis method was used to prepare biomass-derived luminescent Carbon Quantum Dots (CQDs). The prepared CQDs exhibited excellent fluorescence and luminescence properties and fluorescence behaviors of CQDs acquired at different pyrolysis temperatures varied. Importantly, the CQDs showed superior surface activity and the styrene-in-water Pickering emulsion prepared using the CQDs as nano-sized surfactant was highly stable: the higher the pyrolysis temperature the better the stability of the emulsion. In addition, there was no stratification found in the emulsion which was stabilized by the CQD500 (CQDs prepared at 500 (cid:1)C) after holding for 72 hours. This research provided an approach for preparing the surfactants of nano-sized particles in large scale. The CQDs prepared using the proposed methods are expected to have a high number of potential applications.
关键词： biomass,nano-sized surfactant,Carbon Quantum Dots,stability,pickering emulsion
更新于2025-11-14 17:04:02
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Thermally Superstable Cellulosic-Nanorod-Reinforced Transparent Substrates Featuring Microscale Surface Patterns
摘要： The recent rapid expansion of thin-film, bendable, and wearable consumer (opto)electronics demands flexible and transparent substrates other than glass. Plastics are the traditional choice, but they require amelioration because of their thermal instability. Here, we report the successful conversion of a soft and thermally vulnerable polymer into a highly thermally stable transparent nanocomposite material. This is achieved by the meticulous choice of a polymer with a glass-transition temperature below 0 °C that gives stable mechanics above room temperature, reinforcing the polymer with a load-bearing hierarchical network of the incredibly strong and stable natural material: cellulose nanorods. Owing to the Pickering emulsification process, the nanocomposites inherit the self-assembled structural hierarchy from the cellulose nanorod-encapsulated resin droplets. The ameliorated nanocomposites have highly desirable high-temperature endurance (～150?180 °C) in terms of the thermomechanical, thermodimensional, and thermo-optical performance. Any photonic nano- or microstructures can be directly molded on the surface of the nanocomposites in high precision for better light management in photonic and optoelectronic applications. The highlight of this work is the demonstration of a highly thermally stable microlens array on the ameliorated transparent nanocomposite.
关键词： thermal stability,polymer nanocomposites,flexible electronics,Pickering emulsion,microlens array,nanocellulose
更新于2025-09-19 17:15:36
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Double protected lanthanide fluorescence core@shell colloidal hybrid for the selective and sensitive detection of ClO-
摘要： Without any surfactant or organic solvent, a water-borne method incorporated a biphasic sol-gel process and a Pickering emulsion process was firstly applied to encapsulate lanthanide complexes. Compared with the free one, the achieved double protected lanthanide fluorescence colloidal hybrid particles with core@shells structure has a specific ClO- detection with high selectivity and sensitivity in contrast with other inorganic ions including Cu2+, Fe3+ and other strong acids. With strong oxidation characteristics, ClO- can gradually penetrate through silica shell, and quench the red fluorescence of lanthanide ions in the organosilica core. This core@shell colloidal nanoprobe exhibits an excellent sensing capacity for hypochlorite in real sample. This green environment friendly method could be easily extended to form functional hybrid particles with other types of reactive oils and nanoparticles for devising other specified fluorescent sensors.
关键词： Core@shell,Hypochlorite,Organosilica,Fluorescence,Pickering emulsion
更新于2025-09-11 14:15:04