NDLI: Encapsulating samarium cobalt magnets for improved corrosion resistance

Content Provider	IEEE Xplore Digital Library
Author	Goldberg, W. Lyzak, W. Thorne, K.
Copyright Year	1997
Description	Author affiliation: Div. of Biomater. & Technol., Illinois Univ., Chicago, IL, USA (Goldberg, W.)
Abstract	Samarium cobalt magnets (SmCo/sub 5/) are used to improve the retention and stability of overdentures, removable partial dentures, and maxillofacial and implant prostheses. Unfortunately, their applications are limited because they corrode in the acidic oral and prosthetic environments. Corrosion decreases the life span of the prosthetic devices by adversely affecting magnetic attraction, and by severely discoloring the prostheses. To provide improved acidic corrosion resistance, SmCo/sub 5/ magnets were encapsulated with thin inorganic polymer films using sol-gel processing technologies. Methyltriethoxysilane [H/sub 3/CSi(OC/sub 2/H/sub 5/)/sub 3/] was polymerized via acid catalyzed [HCl] hydrolysis/polycondensation reactions with distilled water and tetrahydrofuran [THF] solvent. The reactant concentrations and polymerization conditions were optimized to maximize film density (maximize corrosion resistance), to minimize setting shrinkage (eliminate crack formation), and to obtain a reasonable setting time (0-24 hours). Optimal sols were used to encapsulate the SmCo/sub 5/ with 12 /spl mu/m polymer films. Ten commercial SmCo/sub 5/ magnets encapsulated with inorganic silicone films were soaked at 20/spl deg/C in acidic buffered solutions (pH=2) and compared to ten uncoated controls to evaluate corrosion resistance. Using atomic absorption spectroscopy to evaluate the respective concentrations of aqueous [Co] in the buffer solutions confirmed that a single inorganic polymer film of 12 /spl mu/m thickness effectively prevents acidic corrosion with a significant concentration difference of 343.0%.
Starting Page	133
Ending Page	136
File Size	331541
Page Count	4
File Format	PDF
ISBN	0780338693
ISSN	10864105
DOI	10.1109/SBEC.1997.583232
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-04-04
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Samarium Cobalt Magnets Corrosion Polymer films Prosthetics Stability Implants Magnetic devices Solvents
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in