Micro Nanofibrillated Cellulose as Functional Additive Supporting Processability of Surface-Active Mineral Suspensions: Exemplified by Pixel Coating of an NO-Sorbent Layer.

Unlike established coating formulations, functional particulate coatings often demand the omission of polymer dispersant so as to retain surface functionality. This results in heterogeneous complex rheology. We take an example from a novel development for an NO mitigation surface flow filter system, in which ground calcium carbonate (GCC), applied in a coating, reacts with NO releasing CO.

Modification of CaCO and CaCO pin-coated cellulose paper under supercritical carbon dioxide-ethanol mixture for enhanced NO capture.

In this work, we examine two modifications of fine-ground calcium carbonate material (GCC) in order to enhanced sorption of NO and subsequent reaction properties toward NO/NO formation by firstly exposing the GCC to supercritical (sc) CO in order to increase particle surface area, a choice specifically made to avoid altering the surface chemistry, and secondly considering the potential advantage of using a surface coupling agent toward NO. The modification by the coupling agent amino silane (AMEO silane) was applied in a supercritical CO-ethanol mixture. The samples were characterised before and after modification by field emission scanning electron microscopy (FESEM), specific surface area determination (BET nitrogen adsorption), ATR-FTIR spectroscopy and ion chromatography to reveal the effects of the surface modification(s) on the morphology, surface textural properties and sorption versus reaction properties with NO.