Preparation of cellulosic air filters with controllable pore structures via organic solvent-based freeze casting: The key role of fiber dispersion and pore size

Abstract

Green and biodegradable cellulose filters with controlled designer pore structures were prepared using organic solvent-based freeze casting. In this paper, the relationship between the different freeze media, including ethanol, isopropanol, and tertiary-butyl alcohol, and the microstructure of the porous filters was investigated. The results of the pore size distribution indicated that the pore channel size decreased remarkably when organic solvents were used as the freezing media. Moreover, the filters showed high filtration efficiencies, up to 99.70% and 99.66% for 0.5 µm and 0.3 µm particles, respectively, under a pressure drop of 180 Pa and at 32 L·min-1 flow rate. The fabrication of cellulosic filters would not only make it a promising candidate for capturing fine particulate matter, but also provide a versatile approach to regulate and design a porous structure for materials applied in various fields.

Significant enhancement on the mechanical and tribological performances of paper‐based friction materials by designing silicone@SiO2 core‐shell structure

“…Generally, the preparation of paper-based friction materials includes fiber dispersion, vacuum filtration, resin impregnation and hot-press curing steps. 10 The raw materials including functionalized CFs, aramid fibers, cellulose fibers [13][14][15][16] and fillers dispersed and formed a uniform pulp suspension according to high-speed stirring. The above mixture was transferred into the container of a paper-making machine assisted with vacuum filtration to obtain a wet sheet.…”

Organic–inorganic interface enhancement for boosting mechanical and tribological performances of carbon fiber reinforced composites

“…Carboxymethyl cellulose (CMC) was widely applied in reinforcing interface bonding of composite materials, due to its high adhesion, low-cost, and non-toxicity. 19,20 Qiu et al 21 self-assembled CMC and graphene oxide on the fiber surface by hydrogen bonding, further inducing the formation of strong micromechanical interaction at the fiber/matrix interphase. The pretreatment process of CMC was conducive to elevating the strength of fibers without structural damage, which would facilitate the insitu growth of metal-organic frameworks (MOFs).…”

“…Carboxymethyl cellulose (CMC) was widely applied in reinforcing interface bonding of composite materials, due to its high adhesion, low‐cost, and non‐toxicity 19,20 . Qiu et al 21 self‐assembled CMC and graphene oxide on the fiber surface by hydrogen bonding, further inducing the formation of strong micromechanical interaction at the fiber/matrix interphase.…”

Retention properties and mechanism of agricultural waste maize whisker on atmospheric mercury

“…Porous materials, with high specific surface area, high porosity and high adsorption, can separate one or more substances in mixtures and are theoretically particularly suitable for the purification of atmospheric Hg mixtures (Ma et al 2018 ; Wang et al 2020 ). At the same time, after hundreds of millions of years of natural selection, the plant microstructure structure presents a natural hierarchical structure, with multilevel, multiscale tubular, cellular or fibrous structural morphological features and micro- and nanosized structures (Wegst et al 2015 ).…”