Liquid crystal behavior of cellulose nanoparticles‐ethyl cellulose composites: Preparation, characterization, and rheology

Abstract

This work deals with assessing the approach for preparation of cellulose nanoparticles (CNPs) to be acted as synergistic component in liquid crystal (LC) ethyl cellulose composite (EC‐CNPs). In this respect different structures of CNPs were prepared by acid and salt agents. These prepared CNPs were characterized by carboxyl content, IR, transmission electron microscope (TEM), and zeta potential, while their composites with EC were characterized by rheological measurements as a key factor for measuring the critical concentration of LC behavior. The results showed that, the crystallinity of CNPs obtained by ammonium persulfate exceeded that prepared by sulfuric acid hydrolysis. TEM images of stained CNPs showed both methods led to produce nanoparticles have rod like shape with aspect ratio (L/W) between 7.69 ± 3 and 31.3 ± 5. For the rheological measurements, it demonstrated the efficient of incorporating the CNPs to EC (EC‐CNPs composites) to decrease the critical concentration of EC from 40 wt% to approximately 34 wt%.

WITHDRAWN: Valorization of Biomass Pulping Waste As Effective Additive For Enhancing The Performance of Liquid Crystal Hydroxypropyl Cellulose Nanocomposite Film

“…Due to their characteristic feature as biodegradable materials, which address and minimize the environmental problems resulting from synthetic materials, their application increased in the last decades. They succeeded in producing functional products (e.g., advanced carbon nanostructures materials for water puri cation, semiconductor, optical materials, functional paper, low toxicity wood adhesives, food and hydrogels for medical and agricultural applications [1][2][3][4][5][6][7][8][9] Lignin is the second most abundant biopolymer and the main source of aromatic structures on earth. It contains an array of functional groups, such as aromatic and aliphatic hydroxyl, carbonyl, and methoxy groups, which imparts su cient reactivity with various compounds.…”

“…Liquid crystals proved to apply in advanced display technology, such as spatial light modulators, telecommunication technology, photonics, or sensors [12,13]. These materials are improved by addition of nanomaterials (e.g., inorganic nanorods, ferroelectric particles, magnetic nanorods and cellulose nanocrystals) which provide changes and adjusting their properties with new function [9,16,17].…”

Cellulose Ether-Based Liquid Crystal Materials: Review Article

“…The synergistic effects of cellulose nanoparticles towards better performances of liquid crystal nanocomposites are confirmed from our previously published articles [121,122]. In this section, we present the liquid crystal behaviour of EC-and HPCnanocomposites due to incorporating 5% CNC or Ox-CNF.…”

HPMC Hydrogel Formation Mechanisms Unveiled by the Evaluation of the Activation Energy

“…In its raw form, it is highly insoluble in both water and nonpolar organic solvents due to hydroxyl groups spread along the backbone that form strong intra- and intermolecular hydrogen bonds [ 14 ]. Still, the partial substitution of hydroxyl groups with small substituents, such as, e.g., methyl [ 15 , 16 , 17 ], ethyl [ 18 , 19 ], hydroxypropyl [ 20 , 21 ], and carboxyl [ 22 , 23 ], turns cellulose into water-soluble derivatives because the substituents hinder the formation of the intra- and intermolecular hydrogen bonds, thus allowing the hydration of the AGU units. The substitution of the hydroxyl groups makes the polymer amphiphilic and might provide the property of undergoing thermoreversible gelation on temperature variations that would allow expansion of its use [ 24 ].…”