We report on a series of blue and deep-blue emitting zwitterionic iridium(III) complexes, consisting formally of a cationic Ir centre and a N,N′-heteroaromatic (N^N) ligand bearing negatively charged side groups, i.e. sulfonate and borate. The synthesis, photophysical and electrochemical properties of this series are described in detail together with their X-ray crystal structure determination. The reported complexes exhibit intense blue (λ_max at 450 nm) and deep blue (λ_max at 435 nm) emission in deaerated solution, similar to the related cationic complexes. The strategy employed, namely the internal salt formation, allows high solubility in many organic solvents as well as for some of the complexes a low sublimation temperature. For this reason, one of the complexes was further tested as an emitter in phosphorescent organic light emitting diodes (PhOLEDs). Despite the zwitterionic nature of the triplet emitter employed, the devices were fabricated by means of sublimation process. The devices showed a peak external quantum efficiency (EQE) as high as 11.0% and Commission Internationale d'Énclairage (CIE) coordinates x = 0.21 and y = 0.33.

Carbon nanoparticles (C-dot) are materials that belong to a class of 0-dimensional nanoparticles with a photoluminescence property. C-dot can be synthesized from a variety of organic acids through bottom-up synthetic methods or from other source of inorganic carbons through top-down synthetic methods. Herein, we report a simple and fast synthesis method for the formation of C-dot from ascorbic acid using microwave heating technique. The success of this synthesis was shown by visual analysis, UV-Vis spectroscopy, fluorescence spectroscopy, and transmission electron microscopy (TEM). Visual analysis showed an increased in fluorescence intensity with the addition of urea as a passivation agent. The maximum fluorescence emission of the C-dot was a blue green color at wavelength 500 nm, after the C-dot was excited at a wavelength of 400 nm. The TEM analysis showed that the synthesized C-dot had an average size of 18 nm. We also conducted a preliminary study on the synthesized C-dot as a heavy ion metal sensor and found selective identification of Cr metal.

2D-COFs with diamine-based linkers have been designed and investigated for CO₂/N₂ gaseous mixture adsorption and separation via a systematic theoretical study by combining DFT calculations and force field-based MD simulations.

In this paper, we report the extraction and characterization of gelatin from the abundant industrial fishery waste of Pangasius skin and swim bladder and its application as the base material for hard capsule shells. The yield of gelatin ranged between 19 and 23, content of moisture is 7.69.2, ash is 1.11.7, pH is 4.15.2, gel strength is 238278 bloom, and viscosity is 6574.7 mP. SDS-PAGE showed all gelatins have chains of α1, α2, and β-peptides. The skin, swim bladder, and mixed gelatins were successfully used in the production of hard capsule shells. The dimensions, weight, disintegration time, and water content properties of the hard capsules from these Pangasius wastes were akin to the standards of commercial capsules.

Herein we report a facile synthesis of blue emitting carbon dots from durian juice and their applications as an eco-friendly inhibitor for copper corrosion in the marine environment. The synthesized C-dots were characterized by infra-red (IR), UV-Visible, and fluorescence spectroscopy. The obtained C-dots exhibited excitation-independent emission at 519 nm with reasonable quantum yield (QY). Based on the IR spectra, hydrophilic groups were abundant on the surface of C-dots such as C=O, O-H, and S=O, thus reflect their potential as corrosion inhibitors. The corrosion inhibition efficiencies were examined on the copper surface in 1% NaCl solution by electrochemical and weight loss techniques. Results indicate that C-dots were found to be an effective inhibitor with the inhibition efficiency as high as 86% using 800 ppm C-dot. The potentiodynamic polarization data showed that the inhibitor was of the mixed type where the slopes of the cathodic and anodic Tafel curves are dependent on the inhibitor concentration.