技术文章
测量应用案例-20220607
阅读:200 发布时间:2022-6-14
文献名:
Composites of mesoporous silica precipitated on nanofibrillated cellulose and microfibrillated cellulose: Effect of fibre diameter and reaction conditions on particle size and mesopore diameter
作者
:
Simin Miri
a
,
Vikram Singh Raghuwanshi
a
,
Philip C. Andrews
b
,
Warren Batchelor
a
a
BioResource Processing Research Institute of Australia (BioPRIA), Department of Chemical Engineering, Monash University, Clayton, 3800, Victoria, Australia
b
School of Chemistry Monash University Clayton, Melbourne, VIC, 3800, Australia
摘要:
Composites of MSNs (mesoporous silica nanoparticles) with nanofibrillated cellulose (NFC) and microfibrillated cellulose (MFC) were synthesized via in-situ precipitation. Controlling
particle size distribution
(PSD), pore diameter, and
pore volume
of
mesoporous silica
nanoparticles (MSNs) by cellulose nanofiber size has been investigated. In-situ precipitation on the 19 nm median diameter of NFC fibres produces MSNs in the diameter range 20–30 nm, the smallest MSN size reported. MSNs precipitated on MFC fibres with a 26 nm median diameter are 37% larger with broader size distribution, larger
mesopore
diameters, and lower specific surface area. The pore volume of MFC-MSNs composite was due to internal mesopores of MSNs and among particles and fibres, while it was primarily because of mesopores within MSNs in NFC-MSNs composite. Particle diameters were unaffected by varying the molar ratio of cellulose: TEOS (tetraethoxysilane) and reaction time. The reaction was mostly complete within only 10 min. The best NFC-MSN composite displayed a specific surface area of 567 m
2
/g with a saturated adsorption capacity of 134 mg/g of methylene blue (MB).
关键词:
Mesoporous silica
;
Nanofibrillated cellulose
;
Microfibrillated cellulose
;
Composite
;
Pore
;
S
BET
;
Aerogel