A Dip‐Coating Process for the Preparation of PZT Microtubes

Abstract

PZT microtubes have been fabricated by dip coating of aqueous PZT powder slurry on vermicelli, followed by burnout of the vermicelli and sintering. The water-absorbing character of the vermicelli made a thin layer of PZT slurry to gel on its surface during dip coating. Thickness of the gel on the surface of the vermicelli depends on the dipping time. The green PZT layer thickness in the range of 140-190 lm could be achieved for a dipping time of 30-120 s. Microtubes having an inner diameter of nearly 500 lm with wall thickness in the range of 120-160 lm could be prepared by this process.M. Kuwabara-contributing editor

Yttria stabilized zirconia microtubes for microfluidics under extreme conditions

“…Despite the inherent difficulties, however, several strategies have been developed for the preparation of microtubes of various ceramic materials within this range. These techniques involve the self-rolling of nanolms, 14,15 microextrusion, 16 an active reactive replica process, 17 dip-coating, 18 chemical vapour deposition, 19 atomic layer deposition of sacricial templates, 20 the thermal processes 21,22 and the wet-chemistry approach. 23-25 Many of the above-mentioned manufacturing processes cannot support high structural homogeneity of the tubes, but from the viewpoint of possible applications, stringent requirements have been set on the manufacturing of tubular structures on the nano-and micro scale.…”

Preparation of PZT Microtubes by Slip Casting on Vermicelli, Followed by In Situ Polymerization

“…The slurries were tumbled in a polyethylene container along with zirconia grinding media for 6 h to form slurries of varying solids loading (48.8–51.6 vol%). The dispersant concentration of 0.12 wt% of PZT powder was used based on our previous work 13 . An additional lot of 2 g urea was added to these slurries to make a urea:formaldehyde mole ratio 1:2.…”

“…The dispersant concentration of 0.12 wt% of PZT powder was used based on our previous work. 13 An additional lot of 2 g urea was added to these slurries to make a urea:formaldehyde mole ratio 1:2.…”

“…Recently, the authors have demonstrated a new slip‐coating process for the preparation of PZT microtubes 13 . In this, vermicelli, a food product made from wheat flour available in the form of fibers, is used as a template for microtubes.…”

“…Recently, the authors have demonstrated a new slipcoating process for the preparation of PZT microtubes. 13 In this, vermicelli, a food product made from wheat flour available in the form of fibers, is used as a template for microtubes. A thin layer of a PZT slurry gel develops on the vermicelli surface during slip coating due to the water absorption character of the vermicelli.…”