Effect of Glow-Discharge Plasma Treatment on Contact Angle and Micromorphology of Bamboo Green Surface

Abstract

The inner and outer surfaces of bamboo stems are usually removed prior to the manufacture of bamboo panels because the surfaces are hydrophobic and difficult to bond with glue. Hence, the recovery and utilization ratio of bamboo during processing is low. This study focused on using glow-discharge plasma to treat green bamboo surfaces to make them less hydrophobic. The effects of plasma treatment on green bamboo stems were examined using contact goniometry (wettability), non-contact confocal profilometry and scanning electron microscopy (SEM). Confocal profilometry and SEM revealed that the morphology of green bamboo surfaces varied between 3 different stems. Plasma was able to etch bamboo green surfaces, and make them rougher and more powdery. Plasma treatment was effective at converting green bamboo surfaces from hydrophobic (initial contact angle >110°) to hydrophilic (contact angle <20°). However, this effect was temporary and contact angle increased with time and recovered approximately 30% of its original value after 24 h. Based on our findings, we conclude that plasma treatment can alter parameters such as surface energy and roughness that could improve glue bonding of green bamboo, but delays between plasma treatment and further processing would need to be minimized.

Study on Performance and Structural Design of Bamboo Helmet

“…Crystallinity is an essential parameter due to its relation to the mechanical properties of bamboo [17]. The bamboo on the bamboo helmet before and after modification was separated and ground to powder with a 30-60 mesh particle size using a micro plant grinder.…”

Improving the wet adhesive bonding of bamboo urea‐formaldehyde adhesive using styrene acrylate by controlling monomer ratios

“…There are a few challenges in replacing wood with bamboo, especially the poor bonding performance limiting its applications. 9,10 In bamboo, the lack of transverse ray cells reduces the porosity in lateral tissue. It makes adhesive flow only through the pores in cell walls, limiting penetration of adhesion in bamboo, especially in the transverse direction.…”

“…There are a few challenges in replacing wood with bamboo, especially the poor bonding performance limiting its applications 9,10 . In bamboo, the lack of transverse ray cells reduces the porosity in lateral tissue.…”

Quantitative Characterization of Bamboo Cortex’structure Based on X-ray Microtomography

“…Liese et al reported that the bamboo cortex contains epidermis and hypodermis, and the primary function of bamboo's cortex is to block water and protect the tissues (Liese et al 1998). Meanwhile, Wang et al found that the contact angle of the untreated bamboo surface was 114˚, indicating a hydrophobic surface (Wang et al 2020). Cui et al noted that the silica in the bamboo cortex forms a perfect bonding interface to cellulose fibers.…”