two simple protocols for the synthesis of tetrahydrobenzo[a]xanthenes-11-ones using nano silica phosphoric acid are reported. short reaction times, high yields, reusability of catalyst and easy workup are some advantages of these protocols.

Abstract In order to evaluate the response of rice plant (Anber 33 cultivar) fertilization with silica, bio-organic fertilizers and spraying nano-titanium nano-cobalt on some growth indicators yield crop Anber cultivar, The field study was conducted in Al-Tali’a district (boycott 41 - Al-Hussainiya) Babylon province, Iraq. for period from 15/6/2021 23/11/2021.The experiment according a randomiz...

An experimental study conducted to evaluate the hardened and durability characteristics of ternary blended concrete containing Nano-Silica Zeolite along with steel fibers act as micro- reinforcement has been presented in this paper. were included different dosages optimum combination above two materials (Nano-Silica -1% Zeolite- 10%) obtained through trails from viewpoint workability strength. ...

The introduction of nanoparticles into seed germination and seedling growth of plants might have a significant impact and thus, it can be used for agricultural applications for better growth and yield. The purpose of this study was to compare the effects of silica and silver nanoparticles on seed germination and early growth traits as well as percent and rate of germination, root length, shoot ...

Electrochemical impedance spectroscopy and gravimetric methods were carried out to analyze water uptake of thin polyurethane films separately filled with either hydrophobic or hydrophilic nano-silica. Correspondingly the impedance spectra and gravimetric data were interpreted in terms of movement of water within the coating and/or to the coating/metal interface. Although the obtained results fr...

background marine sponge/nano-cuo as a natural catalyst efficiently catalyzed the sulfonylation reaction of p-chlorobenzene sulfonyl chlorides with amines in order to prepare sulfonamides. the advantages included use of a natural catalyst, ease of handling, requirement of a very small amount of catalyst, mild reaction condition and appropriateness to high yield. objectives the current study aim...

Diatoms are eukaryotic microalgae that produce species-specifically structured cell walls made of SiO(2) (silica). Formation of the intricate silica structures of diatoms is regarded as a paradigm for biomolecule-controlled self-assembly of three-dimensional, nano- to microscale-patterned inorganic materials. Silica formation involves long-chain polyamines and phosphoproteins (silaffins and sil...

For a controlled particle size distribution, nano-silica was added to three different cements. The chemical and mineralogical compositions of the cements were characterized by fluorescence X-ray diffraction. granulometric distributions nano-silicas obtained laser granulometry dynamic lightning scattering. specific surface area raw materials determined gas adsorption. effect type cement on rheol...