We present the science and technology roadmap for graphene, related two-dimensional crystals, and hybrid systems, targeting an evolution in technology, that might lead to impacts and benefits reaching into most areas of society. This roadmap was developed within the framework of the European Graphene Flagship and outlines the main targets and research areas as best understood at the start of this ambitious project. We provide an overview of the key aspects of graphene and related materials (GRMs), ranging from fundamental research challenges to a variety of applications in a large number of sectors, highlighting the steps necessary to take GRMs from a state of raw potential to a point where they might revolutionize multiple industries. We also define an extensive list of acronyms in an effort to standardize the nomenclature in this emerging field.

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Science and technology roadmap for graphene, related two-dimensional crystals, and hybrid systems

The primary aim of this article is to provide an overview of perfluoroalkyl and polyfluoroalkyl substances (PFASs) detected in the environment, wildlife, and humans, and recommend clear, specific, and descriptive terminology, names, and acronyms for PFASs. The overarching objective is to unify and harmonize communication on PFASs by offering terminology for use by the global scientific, regulatory, and industrial communities. A particular emphasis is placed on long-chain perfluoroalkyl acids, substances related to the long-chain perfluoroalkyl acids, and substances intended as alternatives to the use of the long-chain perfluoroalkyl acids or their precursors. First, we define PFASs, classify them into various families, and recommend a pragmatic set of common names and acronyms for both the families and their individual members. Terminology related to fluorinated polymers is an important aspect of our classification. Second, we provide a brief description of the 2 main production processes, electrochemical fluorination and telomerization, used for introducing perfluoroalkyl moieties into organic compounds, and we specify the types of byproducts (isomers and homologues) likely to arise in these processes. Third, we show how the principal families of PFASs are interrelated as industrial, environmental, or metabolic precursors or transformation products of one another. We pay particular attention to those PFASs that have the potential to be converted, by abiotic or biotic environmental processes or by human metabolism, into long-chain perfluoroalkyl carboxylic or sulfonic acids, which are currently the focus of regulatory action. The Supplemental Data lists 42 families and subfamilies of PFASs and 268 selected individual compounds, providing recommended names and acronyms, and structural formulas, as well as Chemical Abstracts Service registry numbers. Integr Environ Assess Manag 2011;7:513–541. © 2011 SETAC

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Perfluoroalkyl and polyfluoroalkyl substances in the environment: Terminology, classification, and origins

http://www.beauty-review.nl/wp-content/uploads/2014/09/Perfluoroalkyl-acids-a-review-of-monitoring-and-toxicological-findings.pdf

Perfluoroalkyl Acids: A Review of Monitoring and Toxicological Findings

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Water Analysis: Emerging Contaminants and Current Issues

Fundamental and applied research in chemistry and biology benefits from opportunities provided by droplet-based microfluidic systems. These systems enable the miniaturization of reactions by compartmentalizing reactions in droplets of femoliter to microliter volumes. Compartmentalization in droplets provides rapid mixing of reagents, control of the timing of reactions on timescales from milliseconds to months, control of interfacial properties, and the ability to synthesize and transport solid reagents and products. Droplet-based microfluidics can help to enhance and accelerate chemical and biochemical screening, protein crystallization, enzymatic kinetics, and assays. Moreover, the control provided by droplets in microfluidic devices can lead to new scientific methods and insights.

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Reactions in Droplets in Microfluidic Channels

The developmental toxicity of tetramethylurea (TMU) was assessed in rats by inhalation exposure of the test material over days 6-20 of gestation. Groups of 25 mated female Crl:CD BR rats were exposed whole-body for 6 hours/day to concentrations of either 0, 2, 20 or 100 ppm TMU. The dams were euthanized on day 21 and the offspring were weighted, sexed, and examined for external, visceral, and skeletal alterations. Maternal toxicity was demonstrated at both 20 and 100 ppm. Maternal body weights, weight changes, and food consumption were statistically significantly reduced at these concentrations; effects were more pronounced at 100 ppm. There was evidence of developmental toxicity only at 100 ppm. The only finding was a decrease in mean fetal weight. No fetal malformations or variations occurred in fetuses derived from rats exposed to all 3 test concentrations (up to 100 ppm). The maternal no-observed-effect-level (NOEL) was 2 ppm, the fetal NOEL was 20 ppm. Thus, TMU was not considered to be uniquely toxic to the rat conceptus.

Developmental toxicity study of tetramethylurea (tmu) in rats

Groups of 20 male Crl:CDBR rats each were exposed, whole-body, for six hours/day, for a total of nine exposures over a two-week period to concentrations of 52, 150, or 500 ppm of 1,5-cyclooctadiene vapor. A control group of 20 male rats was exposed simultaneously to houseline air. Ten rats per group were used for standard toxicological evaluations and ten rats per group for neurotoxicity testing. In the standard toxicology group, at the end of the exposure period, blood and urine samples were collected for clinical analyses, and five rats per group were sacrificed for pathologic examination. After a two-week recovery period, the surviving rats in the standard groups were also given clinical and pathological examinations. The neurotoxicity group was given a functional observational battery (FOB) test and motor activity evaluations after the fourth and ninth exposures. In addition, six of ten neurotoxicity rats per exposure group were given neuropathology evaluations at the end of the exposure period.In rat...

Inhalation toxicity of cyclooctadiene in rats.

Phenylphosphinic acid was fed in graded concentrations of either 0 (control), 100, 1,000, or 10,000 ppm to rats for 28 days. These concentrations provided average daily doses of 8, 76, and 779 mg/kg (males) and 9, 83, and 859 mg/kg (females). No signs of adverse response were detected at any concentration up to the highest levels tested, 10,000 ppm or 779 (male) or 859 (female) mg/kg. Parameters measured were clinical signs, growth, neurobehavior, ophthalmology, and clinical and anatomical pathology. Phenylphosphinic acid is very low in toxicity following 31 days of feeding to the rat.

Four week feeding toxicity study with phenylphosphinic acid in rats.

Metabolic studies with dinitramine

ρ-Nitrobenzylchloride (p-NBC, G4S no. 700–74–7) was tested for its inhalation toxicity to rats following both single and repeated exposures. One of 6 rats exposed a single time to 280 mg/m3 died, as did 4 of 6 exposed to 7300 mg/m3. The material is considered moderately toxic following acute inhalation. The only adverse response in rats exposed to 6 mg/m3, 6 h/day, 5 days/wk for 2 wk was irritation to the nasal epithelium. Rats exposed to 20 mg/m3 showed decreased rate of weight gain, altered liver enzyme activity without anatomic pathology, and irritation of the nasal cavity. Rats exposed to 60 mg/m3 did not tolerate the exposure regimen, with 2 of 10 rats dying. The number of exposures in this group was reduced from 70 to 7. These rats showed evidence of distress (weight loss, lethargy, breathing difficulties) as exposures continued. The target tissues at this concentration were the nasal and tracheal epithelium, with the lesions being more pronounced than seen at the lower concentrations tested...

Gerald L. Kennedy

Papers

Developmental toxicity study of tetramethylurea (tmu) in rats

Inhalation toxicity of cyclooctadiene in rats.

Four week feeding toxicity study with phenylphosphinic acid in rats.

Metabolic studies with dinitramine

Inhalation Toxicology of ρ-Nitrobenzylchloride