scholarly journals Fluorous phthalocyanines and subphthalocyanines

2020 ◽  
Vol 24 (08) ◽  
pp. 1074-1082 ◽  
Author(s):  
Kosuke Yoshinaga ◽  
Leo Delage-Laurin ◽  
Timothy M. Swager
Keyword(s):  
Structural Design ◽  
Fluorine Content ◽  
Design Principles ◽  
Limited Solubility ◽  
High Fluorine Content

Incorporating fluorine atoms into a molecule can endow it with various unique properties that enable materials applications. Selective solubility in fluorous solvents is achieved by a high fluorine content and selective partitioning into perfluorinated liquids over organic and aqueous phases provides orthogonal opportunities for chemistry and materials assembly. Although there is a growing number of partially fluorinated molecules, there are insufficient structural design principles to produce diverse fluorous soluble dyes. Herein, we report the synthesis of six fluorous phthalocyanine and subphthalocyanine dyes, and study their properties in the fluorous phase. Phthalocyanines generally display limited solubility and we also observed apparent aggregation in the fluorous phase. However, the nonplanar subphthalocyanines showed greater solubility. Subphthalocyanines also displayed fluorescence in selected solvents, and their emissive properties were investigated. The materials described expand the library of fluorous dyes and provide insights for the design of new molecules with fluorous solubility.

scholarly journals Fluorine in natural waters of the Odesa region: Medicaland geographical analysis

2017 ◽  
pp. 346-357
Author(s):  
Valentina Trigub
Keyword(s):  
Drinking Water ◽  
Natural Waters ◽  
Chemical Elements ◽  
Dental Health ◽  
Fluorine Content ◽  
Drinking Waters ◽  
High Fluorine Content ◽  
Dental Diseases ◽  
Anthropogenic Loading ◽  
The City

The study of fluorine content in the natural waters of the Odesa region was carried out. The content of fluorine in the waters of the centralized and non-centralized drinking waters supply of the Odesa region and the city of Odesa is determined. Areas with low and high fluorine content are found. Very low fluorine content is determined in Kiliyskyi, Bilyaivskyi, Kodimskyi and Savranskyi districts of the Odessa region. High fluorine content (above MAC) is determined in the Tarutinskiy and Arzizkyi districts. Correlation dependence of fluorine content in drinking water of the Odesa region and indicators of the prevalence of dental diseases (caries and fluorosis of teeth) of the population of the region and the city are established. It is determined that for most districts of the region there is a relationship between the content of fluorine in drinking waters and dental health. In some areas, this dependence is not sufficiently expressed, which is due to the geochemical and ecological characteristics of the territory. It is revealed that for the population of Odesa, who use water with very low fluoride content, high indicators of the disease for caries and fluorosis of teeth are characteristic, which is connected with the allocation of industrial areas with significant anthropogenic loading, including fluorine compounds. One of the possible causes of dental disease, even with optimal fluorine content in drinking water, can be the combination of its action with other chemical elements. Key words: fluorine, drinking water, Odesa region, Odesa city, caries and fluorosis of teeth.

Structural design principles for low hole effective mass s-orbital-based p-type oxides

2017 ◽  
Vol 5 (23) ◽  
pp. 5772-5779 ◽  
Author(s):  
Viet-Anh Ha ◽  
Francesco Ricci ◽  
Gian-Marco Rignanese ◽  
Geoffroy Hautier
Keyword(s):  
Effective Mass ◽  
First Principles ◽  
Structural Design ◽  
Carrier Mobility ◽  
Design Principles ◽  
Hole Effective Mass ◽  
P Type

We demonstrate through first principles computations how the metal–oxygen–metal angle directly drives the hole effective mass (thus the carrier mobility) in p-type s-orbital-based oxides.

Bioinspired Materials Design: An Assessment of Methods to Improve a Text Mining Algorithm for Identifying Biological Material Structural Design Principles

2016 ◽  
Author(s):  
Joanna Tsenn ◽  
Julie S. Linsey ◽  
Daniel A. McAdams
Keyword(s):  
Text Mining ◽  
Structural Design ◽  
Design Principles ◽  
Biological Materials ◽  
Journal Articles ◽  
Part Of Speech ◽  
Mining Algorithm ◽  
Wide Range ◽  
Bioinspired Materials ◽  
Future Work

Natural materials are able to achieve a wide range and combination of properties through the arrangement of the material’s components. These biological materials are often more effective and better suited to their function than engineered materials, even with the use of a limited set of components. By mimicking a biological material’s component arrangement, or structure, man-made bioinspired materials can achieve improved properties as well. While considerable research has been conducted on biological materials, identifying the beneficial structural design principles can be time-intensive for a materials designer. Previously, a text mining algorithm and tool were developed to quickly extract passages describing property-specific structural design principles from a corpus of materials journals. Although the tool identified over 90% of the principles (recall), many irrelevant passages were returned as well with approximately 32% of the passages being useful (precision). This paper discusses approaches to refine the program in order to improve precision. The text classification techniques of machine learning classifiers, statistical features, and part-of-speech analyses, are evaluated for effectiveness in sorting passages into relevant and irrelevant classes. Manual identification of patterns in the returned passages is also employed to create a rule-based method, resulting in an updated algorithm. An evaluation comparing the revised algorithm to the previously developed algorithm is completed using a new set of journal articles. Although the revised algorithm’s recall was reduced to 80%, the precision increased to 45% and the number of returned passages was reduced by 22%, allowing a materials designer to more quickly identify potentially useful structures. The paper concludes with suggestions to improve the program’s usefulness and scope for future work.

A SIMPLE review

2020 ◽  
Vol 35 (09) ◽  
pp. 2030005
Author(s):  
M. Felizardo
Keyword(s):  
Low Cost ◽  
Ambient Pressure ◽  
Bubble Chamber ◽  
Massive Particle ◽  
Fluorine Content ◽  
Low Noise ◽  
Phase Iii ◽  
Dark Matter Search ◽  
High Fluorine Content ◽  
Search Experiment

The Superheated Instrument for Massive ParticLe searches (SIMPLE) consists of an astroparticle dark matter search experiment with large active mass superheated droplet detectors (SDDs), that are installed at the underground low noise laboratory in France (LSBB). Several factors made the use of SDDs an attractive approach for the detection of weakly interacting massive particles (WIMPs), namely their intrinsic insensitivity to minimally ionizing particles, high fluorine content, low cost and operation at near ambient pressure and temperature. The signal that arises from the droplet phase transition generates a millimetric-sized gas bubble that is recorded by acoustic means. I describe the SIMPLE detectors, their acoustic instrumentation and signal analysis, which generated several science measurements executed through several phases over the last 20 years: the Pilot Phase with an exposure of 0.19 kgd, Phase I with an exposure of 0.42 kgd, Phase II with an exposure of 18.24 kgd and, an intended Phase III with an expected exposure increasing from 100 to 2500 kgd to be executed with a bubble chamber.

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