powder activated carbon surface (ac) was grinded and modified and altered procedure thorough a facile and easy chemical reaction to appearance of 2-((3silylpropylimino)1-methyl) phenol (ac- (spimp)). subsequently, this novel sorbent efficiently applied for the extraction and preconcentration of some metal ions from real samples. preliminary the influences of variables such as ph, amounts of rea...

Mono-elemental two-dimensional (2D) crystals (graphene, silicene, germanene, stanene, and so on), termed 2D-Xenes, have been brought to the forefront of scientific research. The stability and electronic properties of 2D-Xenes are main challenges in developing practical devices. Therefore, in this review, we focus on 2D free-standing group-IV graphene analogs (graphene quantum dots, silicane, an...

Hydrophobically modified (HM) water-soluble polymers, e.g. cellulose, starch or guar exhibit enhanced solution viscosity and unique rheological behaviour. These properties are explained in terms of intermolecular hydrophobic associations [1]. The general solution viscosity behavior of HM polymers of different hydrophobic chain length (moth frequently in the range of C8 to C24) is characterized ...

A method is presented to tune the holes in colloidal masks used for nanolithography. Using a simple wet-chemical method, a thin layer of silica is grown on masks of silica particles. The size of the holes is controlled by the amount of tetraethoxysilane (TEOS) added. More accurate tuning of the hole size is possible in the presence of a calibrated seed dispersion of silica colloids. We demonstr...