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Topic Area: Nanotech/Environment, Health
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Displaying records 21 to 30 of 33 records.
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21. Challenges for Physical Characterization of Silver Nanoparticles Under Pristine and Environmentally Relevant Conditions
Topic: Nanotech/Environment, Health & Safety
Published: 3/17/2011
Authors: Robert I MacCuspie, Kim Rogers, Manomita Patra, Zhiyong Suo, Andrew John Allen, Matthew N. Martin, Vincent A Hackley
Abstract: The conditions used to disperse silver nanoparticles (AgNPs) strongly impact their resulting size measurements and agglomeration state, based on the underlying metrology and physical chemistry, respectively. A series of AgNP materials with reported ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907651

22. Dispersion Stability of Nanoparticles in Ecotoxicological Investigations: A Comparison of Different Techniques
Topic: Nanotech/Environment, Health & Safety
Published: 2/26/2011
Authors: Ratna Tantra, Shingheng Jing, Siva Kaliyappan, Nicholas Walker, James Noble, Vincent A Hackley
Abstract: One of the main challenges in nanoecotoxicological investigations is in the selection of the most suitable measurement methods and protocols for nanoparticle characterisation. Several parameters have been identified as being important as they govern ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906180

23. PREPARATION OF A NANOSCALE TiO2 AQUEOUS DISPERSION FOR TOXICOLOGICAL OR ENVIRONMENTAL TESTING
Topic: Nanotech/Environment, Health & Safety
Published: 1/24/2011
Authors: Julian S. Taurozzi, Vincent A Hackley
Abstract: This work prescribes the preparation of a P25 nanoparticle dispersion in high purity deionized water, as a first step towards the preparation of nanoscale P25 dispersions in relevant biological and environmental matrices. This protocol should be used ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907260

24. Phase Distribution of 14C-labeled Multi-walled Carbon Nanotubes in Aqueous Systems Containing Model Solids: Peat
Topic: Nanotech/Environment, Health & Safety
Published: 1/11/2011
Authors: Elijah J Petersen, Liwen Zhang, Qingguo Huang
Abstract: Understanding the sorption interactions between nanoparticles and soils or sediments is a critical factor in determining their fate in environmental systems. As such, we examined the interactions of 14C-labeled multi-walled carbon nanotubes (MWNTs) ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905639

25. Colloidal Stability of Silver Nanoparticles in Biologically Relevant Conditions
Topic: Nanotech/Environment, Health & Safety
Published: 12/30/2010
Author: Robert I MacCuspie
Abstract: Understanding the colloidal stability of nanoparticles may play a key role in interpretation of toxicological experiments, in determining if single nanoparticles or their aggregates provided the dominant result. This report examines a variety of ins ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903738

26. Influence of Polyethyleneimine Graftings of Multi-Walled Carbon Nanotubes on Their Accumulation and Elimination by and Toxicity to Daphnia magna
Topic: Nanotech/Environment, Health & Safety
Published: 12/23/2010
Authors: Elijah J Petersen, Roger A Pinto, Danielle J Mai, Peter E Landrum, Walter J. Weber
Abstract: Carbon nanotubes (CNTs) are often modified for different intended applications which often changes the nanotubes’ physicochemical properties, such as surface charge. Assessing the extent to which such modifications to carbon nanotubes influence thei ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906209

27. Ultrasonic Dispersion of Nanoparticles for Environmental, Health and Safety Assessment--Issues and Recommendations
Topic: Nanotech/Environment, Health & Safety
Published: 11/30/2010
Authors: Julian S. Taurozzi, Vincent A Hackley, Mark R. Wiesner
Abstract: A common approach for the study of the environmental and biological interactions of nanomaterials relies on the ultrasonic disruption of powders to obtain nanoparticle suspensions. Yet, the widespread and inconsistent use of ultrasonic treatment acro ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905978

28. Dispersion Stabilization of Silver Nanoparticles in Synthetic Lung Fluid Studied under In-Situ Conditions
Topic: Nanotech/Environment, Health & Safety
Published: 8/23/2010
Authors: Robert I MacCuspie, Andrew John Allen, Vincent A Hackley
Abstract: The dispersion stabilization of silver nanoparticles in synthetic lung fluid is studied systematically to determine the key ingredients for colloidal stabilization. A variety of in-situ techniques are used, including dynamic light scattering, UV-Vis ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903694

29. Reporting Guidelines for the Preparation of Nanoparticle Dispersions from Dry Materials
Topic: Nanotech/Environment, Health & Safety
Published: 7/8/2010
Authors: Julian S. Taurozzi, Vincent A Hackley, Mark R. Wiesner
Abstract: This document provides general guidelines for reporting relevant conditions and critical parameters relating to the dispersion of nanoparticles in liquid media, including the application of ultrasonic energy or other mechanical dispersion methods (se ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905966

30. Mechanisms and Measurement of Nanomaterial-Induced Oxidative Damage to DNA
Topic: Nanotech/Environment, Health & Safety
Published: 6/22/2010
Authors: Bryant C Nelson, Elijah J Petersen
Abstract: Many of the current investigations on the environmental health and human safety risks of engineered nanomaterials focus on their short-term acute effects. However, the long-term chronic effects of nanomaterials on living systems, and in particular, ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905201