Using Rheology and Image Processing to Study the Effects of Cellulose Nanocrystal Sedimentation DOI
Sadat Kamal Amit, Virginia A. Davis

Langmuir, Journal Year: 2024, Volume and Issue: 40(43), P. 22561 - 22572

Published: Oct. 18, 2024

The effect of sedimentation on lyotropic liquid crystalline dispersions is both an interesting subject in colloidal science and practical importance for understanding changes that can occur during dispersion storage. This research explored how the seemingly subtle average length resulting from a single step affected rheological properties self-assembly aqueous sulfated cellulose nanocrystals. Sedimentation primarily isotropic nanocrystal 1 month at ambient conditions resulted top phase biphasic bottom phase, which were separated further study. Both atomic force microscopy measurements intrinsic viscosities determined via Fedor's equation showed preferential fractionation longer nanocrystals (CNCs) to phase. effects this rheology behavior studied by preparing range concentrations each As expected, concentration isotropic-biphasic transition was significantly lower than or parent dispersion. Rheological generally subtle, but significant differences seen storage modulus approaching gelation. Most notably, quantitative image processing even simple, single-step process had impact relative proportion tactoids chiral helices with planar homeotropic anchoring self-assembled films. These results highlight polydispersity due have nanomaterial mesogens.

Language: Английский

Hydrophobic Enhancements Through Silane Modification: Comparative Study of Graphene Oxide and Cellulose Nanocrystals DOI
Siti Maznah Kabeb,

Atif Ur Rahman,

Farah Hanani Zulkifli

et al.

Published: Jan. 1, 2025

Language: Английский

Citations

0
Amino-functionalization of PVA/TiO 2 -CeO 2 nanohybrid adsorbent for the removal of selenium ions from aqueous solutions: Equilibrium and kinetics studies DOI

Hossein Senisel Bachari,

S. Milani,

Simin Janitabar-Darzi

et al.

Separation Science and Technology, Journal Year: 2024, Volume and Issue: 59(15), P. 1329 - 1343

Published: Aug. 6, 2024

In this study, a hybrid nanoadsorbent (HnA), (PVA/TiO2-CeO2), was synthesized and amino-functionalized by 3-aminopropyltriethoxysilane (APTES) to produce AHnA, for use in an advanced selenium adsorption study focusing on nonlinear equilibrium kinetics models. AHnA characterized using XRD, FTIR spectroscopy, SEM, EDX elemental analyses, as well BET-BJH techniques. According the results, APTES has successfully cross-linked PVA chain introduced amine groups surface. Moreover, modification resulted increase total pore volume from 0.0061 cm3/g HnA 0.021 AHnA. Several experiments were conducted determine impact of varying contact times within pH range 1 8 concentrations ranging 5 200 mg/L, One-Variable-At-a-Time (OVAT) procedure. Accordingly, dosage 2 g/L modified nanocomposite exhibits optimal performance removing 20 mg/L solution at acidic 3 during 300 minutes with ions, while conforming pseudo-second-order kinetic model. The assessment various isotherm models analyzing data revealed that experimental conformed generalized isotherm, showing maximum monolayer capacity 17.643 mg/g.

Language: Английский

Citations

0
Using Rheology and Image Processing to Study the Effects of Cellulose Nanocrystal Sedimentation DOI
Sadat Kamal Amit, Virginia A. Davis

Langmuir, Journal Year: 2024, Volume and Issue: 40(43), P. 22561 - 22572

Published: Oct. 18, 2024

The effect of sedimentation on lyotropic liquid crystalline dispersions is both an interesting subject in colloidal science and practical importance for understanding changes that can occur during dispersion storage. This research explored how the seemingly subtle average length resulting from a single step affected rheological properties self-assembly aqueous sulfated cellulose nanocrystals. Sedimentation primarily isotropic nanocrystal 1 month at ambient conditions resulted top phase biphasic bottom phase, which were separated further study. Both atomic force microscopy measurements intrinsic viscosities determined via Fedor's equation showed preferential fractionation longer nanocrystals (CNCs) to phase. effects this rheology behavior studied by preparing range concentrations each As expected, concentration isotropic-biphasic transition was significantly lower than or parent dispersion. Rheological generally subtle, but significant differences seen storage modulus approaching gelation. Most notably, quantitative image processing even simple, single-step process had impact relative proportion tactoids chiral helices with planar homeotropic anchoring self-assembled films. These results highlight polydispersity due have nanomaterial mesogens.

Language: Английский

Citations

0