Positively charged water-solid interfaces are prepared by adsorption of a cationic polyelectrolyte poly(diallyldimethylammonium chloride) (PDADMAC) from aqueous solutions to planar silica substrates. These substrates characterized atomic force microscopy (AFM), optical reflectivity, and streaming current measurements. By tuning the amount adsorbed polyelectrolyte, surface charge substrate can b...

This study proposed a novel method of crushing glass aggregates to reduce the alkali-silica reaction (ASR). Glass were crushed while immersed in different calcium bearing solutions. ASR measurement and compressive strength tests mortars incorporating aggregate performed investigate feasibility method. The results indicate that was effective both mitigation improvement. Calcium nitrite solution ...

Composite sorbents based on silica, polyethylene glycol (PEG) and containing calcium chloride were successfully synthetized using the sol-gel method. Their heat storage performance was investigated in a lab-scale open fixed-bed reactor. The silica/PEG matrix managed to stabilize hydrated when salt content equal 32 wt% despite partial deliquescence. presence of crystallized phase CaCl2/PEG resul...

Abstract Coatings are used as practical solutions against the intrusion of corrosive ions into concrete structures, particularly, in harsh marine environment. In present study, effectiveness using cement-based and geopolymer-based coatings produced by-product materials has been evaluated. Silica fume GGBFS at their optimum dosages were incorporated mortar mixtures a cement replacement, NaOH or ...

nanotechnology has various applications in oil and gas industry such as enhanced oil recovery (eor). the main challenge in using nanoparticles in eor processes is their stability in harsh conditions such as high temperature, high pressure, and intermediate to high salinity. however, most of the recent experimental works have been performed under unrealistic conditions such as the use of distill...

UNLABELLED BACKGROUND Pyrethroids are widely used for the control of pests and insects, as pyrethroids are believed to pose little risk to human health and environment. However, exposure to the pyrethroids exceeding the label directions might adversely affect human health and environment. Hence a careful selection of environment friendly household product is required that must contain exactl...

medium (glucose 2%, soybean meal 2.5%, soluble starch 1 %, meat extract 0.1%, dried yeast 0.4% and NaCl 0.2%, adjusted pH 7.0). The fermentation was carried out at 28°C, 350rpm stirring speed and 18 liters/minute aeration rate for 72 hours. The fermentation and the following purification procedure were monitored by the inhibitory activity of [3H]thymidine-uptake into Balb/MK cells stimulated wi...

Surface water and sediment samples collected from Jukskei River in South Africa, were subjected to different extraction techniques, liquid-liquid (LLE), solid-phase extraction (SPE), activated carbon extraction (ACE) and soxhlet extraction (SE) for sediment. The samples were extracted with dichloromethane, cleaned in a silica gel column and the extracts quantified using a Varian 3800 GC-ECD. Th...