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【技术产业】新测量方法引导小孔价值
301-975-3776
National Institute of Standards and Technology (NIST)
New measurement guide worth 'poring over'
In industries from textiles to automobiles and from pharmaceuticals to semiconductors, accurately measuring empty spaces--technically speaking, porosity--is a substantial matter, important to efforts to ensure high product quality and low scrap rates.
This is because tiny pores--usually smaller than 50 nanometers in diameter--come in many varieties, creating complex internal and external surface features that strongly influence the performance of catalysts, filters, brake pads, pigments, ceramic components, time-release capsules and many other engineered products.
A new Recommended Practice Guide from the National Institute of Standards and Technology (NIST) provides useful advice and instruction on how to analyze the size, distribution and total volume of tiny pores. The 79-page manual, Porosity and Specific Surface Area Measurement for Solid Materials, was jointly produced by scientists from NIST and Germany's Federal Institute for Materials Research and Testing (BAM).
The two government research organizations are collaborating to produce certified reference materials. These reference materials are carefully characterized samples that serve as benchmarks for evaluating the accuracy of instruments used to measure the chemical composition or certain physical properties of materials. For example, NIST and BAM offer samples of alumina beads (NIST Standard Reference Material 1917) with certified values for pore volume, mean pore diameter, and most common pore diameter.
Industry uses a variety of methods to measure the surface area and pore characteristics of powders and other materials characterized by large surface-to-volume ratios. Differences among the methods complicate efforts to compare and interpret measurement results. Also, strengths and limitations of the various techniques are important for manufacturers to know when designing materials with pore sizes and distributions optimized for specific applications and products. The new guide details the "practical issues that need to be considered when conducting a measurement or analysis" by one or more of the commonly used porosimetry techniques.
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To request a copy of Porosity and Specific Surface Area Measurement for Solid Materials, NIST Recommended Practice Guide, NIST SP 960-17, send an e-mail to denise.shaw@nist.gov. 本人已认领该文编译，48小时后若未提交译文，请其他战友自由认领。 新测量方法引导小孔价值
New measurement guide worth 'poring over'
In industries from textiles to automobiles and from pharmaceuticals to semiconductors, accurately measuring empty spaces--technically speaking, porosity--is a substantial matter, important to efforts to ensure high product quality and low scrap rates.
从纺织工业到汽车工业，从药物制剂到半导体工业，精确的测量空隙——专业的说，孔隙率——是一件非常重要的事，对保证高产品质量，降低废品率有重要作用。
This is because tiny pores--usually smaller than 50 nanometers in diameter--come in many varieties, creating complex internal and external surface features that strongly influence the performance of catalysts, filters, brake pads, pigments, ceramic components, time-release capsules and many other engineered products.
这是因为小孔——通常直径小于50纳米——具有多种变化，造成复杂的内部和外部的表面形态，对催化剂，滤光器，制动衬块，颜料，陶瓷元件，定时释放胶囊和其他很多工业产品的性能有很大影响。
A new Recommended Practice Guide from the National Institute of Standards and Technology (NIST) provides useful advice and instruction on how to analyze the size, distribution and total volume of tiny pores. The 79-page manual, Porosity and Specific Surface Area Measurement for Solid Materials, was jointly produced by scientists from NIST and Germany's Federal Institute for Materials Research and Testing (BAM).
国家标准和技术学会(NIST)新的推荐实践指导提供了一个有用的建议和指导，该指导说明了如何分析小孔的大小，分布和总体积。这本79页的手册《固体材料孔隙率和比表面积的测量》，由NIST，以及德国材料研究和测试联邦学院(BAM)的科学家共同编写。
The two government research organizations are collaborating to produce certified reference materials. These reference materials are carefully characterized samples that serve as benchmarks for evaluating the accuracy of instruments used to measure the chemical composition or certain physical properties of materials. For example, NIST and BAM offer samples of alumina beads (NIST Standard Reference Material 1917) with certified values for pore volume, mean pore diameter, and most common pore diameter.
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作者:admin@医学,生命科学 2010-10-21 05:11
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