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North Potomac, MD, United States

Freiman S.W.,Freiman Consulting | Fong J.,Drexel University
Ceramic Transactions | Year: 2010

All ceramics as well as most semiconducting materials are brittle. In addition, most of these materials are susceptible to environmentally enhanced crack growth, leading to possible delayed failure over time. This paper describes the fracture mechanics background, testing procedures, and statistical analysis techniques that can be used to confidently predict safe lifetimes of such brittle materials under stress in crack growth enhancing environments, usually water. Source


Freiman S.,Freiman Consulting
International Journal of Applied Glass Science | Year: 2012

This paper presents a summary of brittle fracture in silicate glasses. In it is discussed our current knowledge of the fracture mechanisms, what studies are ongoing, and what still remains unknown. The paper presents a historical perspective of the research into glass fracture including an annotated bibliography of key publications. Several key points include the susceptibility of silicate glasses to environmentally enhanced crack growth, the quantitative nature of the markings left on the fracture surface by a growing crack, the issue of crack arrest at low stresses, and recent work on the atomistic modeling of the fracture process. The paper concludes with a summary of both what we know, and what is yet to be learned about the important topic of glass fracture. © 2012 The American Ceramic Society and Wiley Periodicals, Inc. Source


Rumble J.,RandR Data Service | Freiman S.,Freiman Consulting | Teague C.,Teague Consulting
Proceedings - 2014 IEEE International Conference on Bioinformatics and Biomedicine, IEEE BIBM 2014 | Year: 2014

Nanomaterials are of interest to virtually every scientific discipline and a wide diversity of user communities. To date, however, there is no agreed upon system for describing nanomaterials, especially across disciplines and user communities. A CODATA-VAMAS Joint Working Group has defined a Uniform Description System (UDS) for nanomaterials that takes into account a wide variety of features useful for accurately characterizing a nanomaterial as well as differentiating one nanomaterial from all others. The UDS is applicable to different types of nanomaterials. The UDS is designed to be directly usable in the development of nanoinformatics resources, standards, regulations, commercial purchasing, and reporting research results. © 2014 IEEE. Source


Rumble J.,R and R Data Services | Freiman S.,Freiman Consulting
Data Science Journal | Year: 2012

Fundamental in building any materials database is the capability to describe the materials whose data are contained therein accurately. While many systems exist for describing traditional materials, such as metals, polymers, ceramics, and others, the evolving field of nanotechnology presents new challenges. In this paper, we define the goals of a materials description system and the information categories used to describe traditional materials. We then discuss the challenges presented by materials on the nanoscale and suggest ways of overcoming those challenges. Source


Johnson S.M.,NASA | Madsen L.D.,National Science Foundation | Freiman S.,Freiman Consulting
International Journal of Applied Ceramic Technology | Year: 2013

Part of the symposium on Nanostructured Materials at the Fourth International Congress on Ceramics (ICC4) dealt with health aspects related to these materials. Major issues discussed included definitions and measurements of nanoparticles, best test protocols, collaboration and communication between, for example, materials scientists and biologists, and the plethora of information and regulations (that is sometimes even conflicting). Emerging opportunities were identified in terms of obtaining uniformity of nomenclature and testing standards, education and training of a new generation of multidisciplinary researchers, and understanding and then fully exploiting the positive aspects of nanomaterials, including improvements to human health. © 2013 The American Ceramic Society. Source

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