نتایج جستجو برای: chemical stability
تعداد نتایج: 662044 فیلتر نتایج به سال:
Conjugated polymer/silica nanocomposites with hexagonal, cubic, or lamellar mesoscopic order were synthesized by self-assembly using polymerizable amphiphilic diacetylene molecules as both structure-directing agents and monomers. The self-assembly procedure is rapid and incorporates the organic monomers uniformly within a highly ordered, inorganic environment. By tailoring the size of the oligo...
Carbonaceous covalent triazine-based frameworks from 1,4-dicyanobenzene (CTF-1) can adsorb up to about 4 g g(-1) of the surfactants alkyl polyglycolether, C12EO7 and sodium dodecylsulfate, SDS from aqueous solution (c = 8.0 mmol L(-1)) which is more than 20-times the gravimetric uptake capacity of a carbon black (Printex L from Evonik). This high uptake is due to CTF sheet exfoliation. Taking i...
F an animal is small and lives in an aqueous environment of constant composition, the necessary mechanical support and protection for its soft internal structures can be provided by skeletal materials of moderate stiffness and of moderate chemical stability. For larger animals, living in less constant aquatic environments or on dry land, it becomes necessary to provide more rigid support for th...
The outstanding characteristics of fluorine gas, e.g. extreme reactivity and oxidizing power, and the utmost electronegativity of F ion, lead to very strong bonds between fluorine and most of the other elements of the periodical table. Treatments involving F2, fluorinated gases and rf plasma-enhanced fluorination (PEF) constitute exceptional tools for modifying the surface properties of materia...
Oscillatory chemical reactions are of significant importance in chemical and biological sciences. In the present paper we have studied the oscillatory behaviours of two chemical reactions (or oscillators). The first is the classical Lotka model of auto-catalytic chemical reaction and the second is the limit cycle chemical reaction (Tri-molecular reaction) due to Schnakenberg. Beside the determi...
Magnesium has been used in aviation industries, automobile manufacturing, electronics and medical engineering due to its unique properties thus far. The main problem in its utilization is the high reactivity of magnesium with oxygen and humidity, which both changes its properties. The surface charge and different density results in difficulties in dispersion stability of the powder in an ...
In this study a methodology was applied in order to ascertain the mechanical stability of biofilms, by using a stainless-steel (SS) rotating device immersed in a biological reactor where biofilms formed by Pseudomonas fluorescens were allowed to grow for 7 days at a Reynolds number of agitation of 2400. The biofilms developed with this system were characterised in terms of amount of total, extr...
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