Mass-selected Au clusters consisting of 5-8 atoms deposited on silica were treated with water and aqueous NaOH solution, and the change of their chemical properties upon these treatments was studied. With water, no change was observed, indicating that the clusters survive as individual entities under such realistic conditions. After immersing the samples into the NaOH solution, a change of the ...

This study aims to observe the impact of fiber lengths and NaOH treatment on tensile properties composite materials made from borassus polyester matrix. used fibers fruit, Wax Mirror Glass, Polyester Alkali (NaOH). The was carried out by soaking in a 15% solution for 2 hours. length this were short (<1cm) long (>8 cm). composition number matrix calculated based volume fraction test spesim...

This experimental study basically aims to come up with a new method [SCPT], which would be reliable accelerated performance for predicting potential alkali reactivity of aggregates, because available test methods whether long or accelerated, have some drawbacks such as duration in the CPT [concrete prism test] and false tests results AMBT [accelerated mortar bar test]. The called short-term con...

This paper presents the benefits of PVA fibers in improving mechanical properties class F fly-ash-based geopolymer concrete. The activator used was 8M sodium hydroxide (NaOH) and silicate (Na2SiO3), with a mass ratio Na2SiO3 to NaOH varied from 1.5 2.5. Cylindrical specimens diameter 100 mm height 200 were prepared for strength tests. geopolymers fixed at 0.4%, 0.6%, 0.8% by total volume. Some ...

Dewaxed bamboo culms (Neosinocalamus affinis) were sequentially extracted with distilled water and 70% ethanol at 80 oC for 3 h, 0.2 and 0.5 M NaOH, 70% ethanol containing 0.6 M NaOH, and 1.0 and 2.0 M NaOH at 50 oC for 3 h using a solid to liquid ratio of 1:25 (g/mL). The hemicellulosic fractions obtained were characterized by high performance anion exchange chromatography (HPAEC), gel permeat...