The effect of pore size and porosity on capillary pressure in microporous hydroxyapatite samples

Chen, Szu-Yin

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https://hdl.handle.net/2142/89066 Copy

Description

Title

The effect of pore size and porosity on capillary pressure in microporous hydroxyapatite samples

Author(s)

Chen, Szu-Yin

Issue Date

2015-12-08

Director of Research (if dissertation) or Advisor (if thesis)

Johnson Wagoner, Amy

Department of Study

Mechanical Science & Engineering

Discipline

Mechanical Engineering

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

M.S.

Degree Level

Thesis

Keyword(s)

• bone scaffold
• hydroxyapatite
• Microporosity
• capillary pressure
• equilibrium height

Abstract

Microporosity (<50μm) in hydroxyapatite (HA) scaffolds is known to improve bone ingrowth. The mechanism for the improvement is thought to be in part due to capillary forces induced by the micropores. The micropore-induced capillary forces can self load cells into the scaffolds. In this study, the effect of micropore size and porosity on capillary forces was investigated. Rectangular shaped HA samples that were either 50% or 60% porous with 5μm, 12μm, 20μm or 50μm pores were fabricated. The samples were characterized by imaging the microstructure, analyzing the composition, measuring the pore size, pore fraction, sample thickness and quantifying the defects inside and outside of the samples. Capillary rise tests were conducted on the samples and fluid height curves were obtained as a function of time. A model was implemented to determine the equilibrium heights and calculate the capillary forces. For 50% porous samples, 5μm samples had the highest equilibrium height and capillary pressure, followed by 12μm, 20μm or 50μm samples. The 60% porous 5μm samples had a faster initial rise, but a lower equilibrium height and capillary pressure than the 50% porous 5μm samples. The 60% porous 50μm samples also had a faster initial rise, a lower equilibrium height and capillary pressure than the 50% porous 50μm samples.

Graduation Semester

2015-12

Type of Resource

text

Permalink

http://hdl.handle.net/2142/89066

Copyright and License Information

Copyright 2015 Szu-Yin Chen

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