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2 results on '"O'Connell, M. S."'

1. Morphology Control in Self-Assembled Monolayers Written by Dip Pen Nanolithography

Author

Barsotti, R. J., Jr., O'Connell, M. S., and Stellacci, F.

Abstract

Here, we describe the effect of writing speed in dip pen nanolithography on the morphology (height and density) of self-assembled monolayers of alkanethiols on gold surfaces. The analysis of atomic force microscopy images of written monolayers shows that molecules assemble according to a nucleation and growth mechanism. Slow writing speeds lead to dense monolayers that can be used either to direct the self-assembly of metal nanoparticles or as masks for selective etching of conductive gold nanowires.

Published
2004

2. A comparative study of smear layer removal using different salts of EDTA.

Author

O'Connell MS, Morgan LA, Beeler WJ, and Baumgartner JC

Subjects
Acids, Alkalies, Chelating Agents administration & dosage, Chelating Agents economics, Cost-Benefit Analysis, Dental Pulp Cavity drug effects, Dental Pulp Cavity ultrastructure, Dentin ultrastructure, Edetic Acid administration & dosage, Edetic Acid classification, Edetic Acid economics, Humans, Hydrochloric Acid, Hydrogen-Ion Concentration, Microscopy, Electron, Scanning, Root Canal Irrigants administration & dosage, Root Canal Irrigants economics, Sodium Hydroxide, Tooth Apex ultrastructure, Tooth Root ultrastructure, Chelating Agents pharmacology, Dentin drug effects, Edetic Acid pharmacology, Root Canal Irrigants pharmacology, Smear Layer
Abstract

Three solutions of EDTA--a 15% concentration of the alkaline salt, a 15% concentration of the acid salt, and a 25% concentration of the alkaline salt--were evaluated for smear layer removal in root canal systems. All solutions were adjusted to pH 7.1 using either NaOH or HCl. When the EDTA solutions were alternately used for root canal irrigation with 5.25% NaOCl, they completely removed the smear layer in the middle and coronal thirds of canal preparations, but were less effective in the apical third. None of the EDTA solutions by themselves were effective at completely removing the smear layer at any level. The alkaline tetrasodium salt, pH adjusted with HCl, is more cost effective and performed equally as well as the more commonly used disodium salt.

Published
2000
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