Mukhopadhyay, A., Devulapalli, B., Dutta, A., and Grald, E. W.
JOM: Journal of The Minerals, Metals & Materials Society. March 2004, Vol. 56 Issue 3, p44, 5 p.
The use of computational fluid dynamics (CFD) software in many materials processing industries has grown tremendously in recent years. Computational fluid dynamics has been widely utilized for conducting virtual experiments, prototype testing, and parametric studies. Analysis using CFD complements and reduces physical testing, and it can result in a significant time and cost savings. In this article, the application of CFD to a variety of materials-processing problems is presented, with examples taken from the steel, aluminum, glass, semiconductor, and polymer processing fields.
Gittard, Shaun D., Miller, Philip R., Jin, Chunming, Martin, Timothy N., Boehm, Ryan D., Chisholm, Bret J., Stafslien, Shane J., Daniels, Justin W., Cilz, Nicholas, Monteiro-Riviere, Nancy A., Nasir, Adnan, and Narayan, Roger J.
JOM: Journal of The Minerals, Metals & Materials Society. June 2011, Vol. 63 Issue 6, p59, 10 p.
Coatings -- Analysis, Drug delivery devices -- Usage, Drug delivery devices -- Analysis, Transdermal medication -- Analysis, Transdermal medication -- Usage, and Stereolithography -- Usage
Microneedles are small-scale needle-like projections that may be used for transdermal delivery of pharmacologic agents, including protein-containing and nucleic acid-containing agents. Commercial translation of polymeric microneedles would benefit from the use of facile and cost effective fabrication methods. In this study, visible light dynamic mask microstereolithography, a rapid prototyping technique that utilizes digital light projection for selective polymerization of a liquid resin, was used for fabrication of solid microneedle array structures out of an acrylate-based polymer. Pulsed laser deposition was used to deposit silver and zinc oxide coatings on the surfaces of the visible light dynamic mask microstereolithography-fabricated microneedle array structures. Agar diffusion studies were used to demonstrate the antimicrobial activity of the coated microneedle array structures. This study indicates that light-based technologies, including visible light dynamic mask microstereolithography and pulsed laser deposition, may be used to fabricate microneedles with antimicrobial properties for treatment of local skin infections.
Vamsi Krishna, B., Xue, Weichang, Bose, Susmita, and Bandyopadhyay, Amit
JOM: Journal of The Minerals, Metals & Materials Society. May 2008, Vol. 60 Issue 5, p45, 4 p.
Degassing of metals -- Usage, Metals -- Usage, Implants, Artificial -- Design and construction, Implants, Artificial -- Analysis, Prosthesis -- Design and construction, and Prosthesis -- Analysis
Interest is significant in patient-specific implants with the possibility of guided tissue regeneration, particularly for load-bearing implants. For such implants to succeed, novel design approaches and fabrication technologies that can achieve balanced mechanical and functional performance in the implants are necessary. This article is focused on porous load-bearing implants with tailored micro-as well as macrostructures using laser-engineered net shaping (LENS[TM]), a solid freeform fabrication or rapid prototyping technique that can be used to manufacture patient-specific implants. This review provides an insight into LENS, some properties of porous metals, and the potential applications of this process to fabricate unitized structures which can eliminate longstanding challenges in load-bearing implants to increase their in-vivo lifetime, such as in a total hip prosthesis.
JOM: Journal of The Minerals, Metals & Materials Society. May 2004, Vol. 56 Issue 5, p22, 3 p.
Magnesium alloys, Magnesium products, and Magnesium industry
Consumption of wrought magnesium products was reduced by half between 1971 and the 1990s. To increase the use of wrought magnesium, several challenges must be overcome: its formability at room temperature is lower than steel or aluminum its productivity is lower than steel or aluminum and extruded magnesium exhibits a marked anisotropy of yield when comparing tension and compression. This article describes research on the rapid evaluation of the extrusion behavior of wrought magnesium alloys. The work aims to establish a methodology for rapid prototyping of alloys and to assess the effects of aluminum on the behavior of AZ-series magnesium alloys.