A Novel Highly Conductive, Transparent, and Strong Pure-Cellulose Film from TEMPO-Oxidized Bacterial Cellulose by Increasing Sonication Power

Abstract

Developing a conductive cellulose film without any metal compounds remains challenging, though in great demand. However, cellulose film prepared from bacterial cellulose (BC) powder without any metal compounds has poor tensile, physical, and electrical properties, thus limiting its application. Herein, this study aims to prepare and characterize an all-cellulose film from 2,2,6,6-Tetramethylpiperidin-1-yl)oxyl (TEMPO)-oxidized bacterial cellulose (TOBC) powders without adding metal compounds and treated by ultrasonication. TOBC powders are sonicated with various powers of 250, 500, and 750 W for 20 min without any other substance. It was proved that increasing the ultrasonication power level resulted in a significant improvement in the properties of the film. The ultrasonication of 750 W increased tensile strength by 85%, toughness by 308%, light transmittance by 542%, and electrical conductivity by 174% compared to the nonsonicated film. A light-emitting diode connected to a power source through this sonicated film was much brighter than that connected via a nonsonicated film. For the first time, this study reports the preparation of electrically conductive, transparent, strong, and bendable pure TOBC films by increasing ultrasonic power for environmentally friendly electronic devices application.

Preparation and Characterization of Novel Polyvinyl Alcohol-Alginate Beads for Quorum Quenching Application in Membrane Bioreactors

“…8b were measured at 16.8 m 2 /g, 23.4 m 2 /g, 16.4 m 2 /g, and 17 m 2 /g, respectively. These ndings are consistent with the previous study reported by Du et al [50], where the BET surface area of PVA-ALG-FeCl 3 beads was reported to be around 19 m 2 /g, with mesopores dominating the overall porosity [45]. The cumulative pore size distribution results obtained through the DFT model indicate that the PVA-ALG beads, OPA10, OPA8, US-10, and SN-BA, have pore sizes ranging between 4 and 40 nm and cumulative pore volume greater than 0.1 cm 3 /g.…”

“…7b and d. Studies by Rahamadiawan et al [45] and Zhang et al[46] also reported similar observations. Meanwhile, OPA8 beads, composed of 8%w/v PVA, possess an internal structure featuring relatively larger pores and less chain branching, as shown in Fig.…”

Neural Network Aided Homogenization Approach for Predicting Effective Thermal Conductivity of Composite Construction Materials

“…As a result, the appearance of cracks reduced the overall thermal conductivity of the aggregates. Second, from the view of molecules, as a previous study pointed out, if the molecules are far from each other, the conductivity will be low due to the high energy needed when the molecules vibrate [39]. Similarly, for an intact rock, the molecules are close to each other.…”

Composites Based on CaCl2-CaBr2 Salt System for Adsorption Applications: Designing the Optimal Sorbent for Gas Drying and Air Conditioning

“…The surface modification of common adsorbents with the use of various functional groups is an alternative way to affect their adsorption properties, which gives diverse hybrid "organic-inorganic" and composite adsorbents [9]. Indeed, through physico-chemical treatment, the moisture adsorption properties of materials can be changed [10,11]. The present-day level of material science allows a target-oriented design of novel porous materials adapted to a particular application.…”