Silylation of TEMPO oxidized nanocellulose from oil palm empty fruit bunch by 3-aminopropyltriethoxysilane

An asymmetric Salamo-based Zn complex supported on Fe3O4 MNPs: a novel heterogeneous nanocatalyst for the silyl protection and deprotection of alcohols under mild conditions

“…Usually attached to the asymmetrically substituted carbon atom, the hydroxyl group can be regarded as the most fundamental functional group in organic chemistry. [5][6][7][8][9][10] Therefore, it is evident that a wide variety of approaches have been disclosed and also the enantioselective synthesis of alcohols can be regarded as one of the most important steps in total synthesis. 11 Although there are important advances in the latestage functionalization of complex molecules, the protection of hydroxyl groups is highly required during the succeeding steps.…”

Laser damage threshold of hydrophobic up-conversion carboxylated nanocellulose/SrF2:Ho composite films functionalized with 3-aminopropyltriethoxysilane

“…Perhaps, hydrophobicity of TOCNF:Но-APS films was caused by evenly distributed layer of chemosorbed linear polysiloxane and hydrogen bonds between NH 2 moieties of aminopropyl groups and OH groups of TOCNF. The latter bonds changed the APS configuration at the film surface: aminopropyl groups were bent, and their polar NH 2 moieties were oriented toward TOCNF surfaces, whereas propyl fragments were oriented along the surface (Culler et al 1985;Indarti et al 2019;Masmoudi et al 2013;Rachini et al 2012).…”

“…Khanjanzadeh et al (2018) performed CNC silylation with APS in aqueous solutions: at the beginning, APS was hydrolyzed in water, adsorbed onto CNC with hydrogen bond formation, covalently bound to CNC by forming Si-O-C bonds with CNC surface after reaction between silanol groups and CNC hydroxyls, resulting in an increase of thermal stability (by ~10°С) of silylated CNC compared to untreated material. Interestingly, we have found only a single report of TOCNF silylation with APS in ethanol/water solutions (Indarti et al 2019). Whereas silylation of CNC and CNF is an efficient way of their hydrophobization, and some authors (Khanjanzadeh et al 2018;Sai et al 2015) mentioned increase of thermal stability of organosilylated CNC and CNF, similar effects for TOCNF have not been reported yet.…”

Populus alba L., an Autochthonous Species of Spain: A Source for Cellulose Nanofibers by Chemical Pretreatment

“…The three bands at 1163, 1101, and 1026 cm −1 observed in both CNF and pulp samples spectra can also be assigned to cellulose. Firstly, the band at 1163 cm −1 is related to pyranosyl rings among C-O asymmetric bands, the band at 1101 cm −1 is attributed to the C-OH skeletal vibration, while the band at 1026 cm −1 is related to C-O stretching vibration [ 57 ]. Moreover, the glycosidic bond vibration was observed at 893 cm −1 in both spectra, and the bands at 1361–1370 and 710 cm −1 also observed in both spectra indicate the presence of I β cellulose allomorph [ 58 ], in agreement with X-ray diffraction analysis.…”