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Standard Guide for Reporting Production Information and Data for Nano-Objects
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NORM herausgegeben am 1.6.2018
Bezeichnung normen: ASTM E3172-18
Ausgabedatum normen: 1.6.2018
SKU: NS-852678
Zahl der Seiten: 5
Gewicht ca.: 15 g (0.03 Pfund)
Land: Amerikanische technische Norm
Kategorie: Technische Normen ASTM
Keywords:
instability, nanomaterials, nano-object, nano-object manufacture, nano-object production, specification, stability,, ICS Number Code 07.120 (Nanotechnologies)
Significance and Use |
5.1 A nano-object at any specific time can be considered well-defined. 5.2 The life-cycle of a nano-object can be viewed as a series of production processes that transforms starting materials or a well-defined nano-object into a new, equally well-defined nano-object. 5.3 Each step of the life-cycle can be considered a separate production action and can be described by the information categories and descriptors within this guide. 5.4 The following are examples of nano-object productions that can be described by this guide. 5.4.1 The creation of carbon nanotubes by arc discharge. 5.4.2 The coating of a nano-object in a random or controlled manner when placed in a liquid. Note 1: The reactivity of nano-objects makes it likely that
even with the utmost precautions, various features and
characteristics may change over time, for example, when a
nano-object is placed in a liquid and coated. Such a coating can
significantly change the properties, functionalities, and
reactivity of the nano-object. This change can be considered one
step of a life-cycle and is a production process.
Note 2: A nano-object may have more than one coating. For
example, titania nano-objects are often coated by alumina by
manufacturers to control certain properties. When these previously
coated nano-objects are placed in liquid containing biological
molecules, they can acquire a second coating. It can require very
careful administration of test procedures to ensure the test
results can meaningfully be ascribed to characteristics and
features of the “initial” nano-objects.
5.4.3 A nano-object experiences changes to its size, shape, physical structure, and other characteristics. Note 3: Events such as shock (unexpected forces), temperature
and pressure changes, humidity changes, shipping, dissolution, and
exposure to acids and bases can result in a changed nano-object
with significantly different properties, functionalities, and
reactivity. These events can be considered a production
process.
5.4.4 Unless care is taken to carefully control potential changes to a nano-object before testing, measurement results should be carefully examined for unintended changes through good laboratory practices, statistical analysis of all data, and verification that test samples maintain their integrity throughout the testing process. 5.5 A nano-object can be subjected to a series or sequence of production steps. The steps can be fully planned and controlled or some steps can happen due to random events. This guide is applicable to describe one, many, or all steps in detail. Note 4: For example, the testing of a nano-object for
potential toxic effects may involve a sequence of steps as shown in
Table 1. As can be seen,
steps such as storage, insertion into biological media, or sampling
can possibly involve random changes to the resulting
nano-object.
5.6 Use of this guide to describe the individual production steps leading to the creation of a tested nano-object can be important in ascertaining the cause-effect relationship between a test result and a nano-object that was made in one of the sequence production steps prior to creation of the tested nano-object. 5.7 The reactivity of individual and collections of nano-objects gives rise to questions about their stability under “non-reactive” conditions such as movement, temperature changes, exposure to heat, and shock. These occurrences are frequent enough in the life cycle of nano-objects that additional information categories and descriptors should be used as detailed in 6.2. 5.8 ISO TC 229 has produced ISO/TS 80004-1:2010(en) that defines terminology applicable to nanomanufacturing. 5.9 Information on quality control with respect to the production process or production results is covered by ASTM and ISO quality control guides. |
1. Scope |
1.1 This guide provides guidelines for describing the production of one or more individual nano-objects. It establishes essential and desirable information categories and descriptors important to specify the production process, including the starting materials, the process itself, and the resulting nano-objects. 1.2 This guide is designed to be directly applicable to reporting production information and data for nano-objects in most circumstances, including but not limited to reporting original research results in the archival literature, developing of ontologies, database schemas, data repositories and data reporting formats, specifying regulations, and enabling commercial activity. 1.3 This guide is applicable to an individual nano-object and a collection of nano-objects. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. |
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