synthesis and characterization of colloidal nanosilica via an ultrasound assisted route based on alkali leaching of silica fume
نویسندگان
چکیده
colloidal nanosilica is currently being produced by various methods which are mainly high energy intensive and/or not environmentally friendly. it is therefore essential to develop new energy-efficient and environmentally friendly technologies. this paper introduces a new ultrasound assisted route based on alkali leaching of silica fume for synthesis of colloidal silica nanoparticles. the effects of sonication time on the particle size distribution of the colloidalnanosilica are studied via dynamic light scattering (dls). the results show that the shape and size of nanoparticles are strongly depended on the ultrasonic time. dls results show that average diameter of the produced colloidal nanosilicadecreases sharply from 337.10 nm to 93.27 nm during the first 5 minutes of sonication. continued sonication up to 30 minutes, however, shows relatively slight decrease in average diameter of the colloidal nanosilica. further, the produced colloidal nanosilica is characterized by scanning electron microscopy (sem), transmission electron microscopy (tem), x-ray diffractometry (xrd) and fourier transform infrared (ftir) spectroscopy.
منابع مشابه
Synthesis and Characterization of Colloidal Nanosilica via an Ultrasound Assisted Route Based on Alkali Leaching of Silica Fume
Colloidal nanosilica is currently being produced by various methods which are mainly high energy intensive and/or not environmentally friendly. It is therefore essential to develop new energy-efficient and environmentally friendly technologies. This paper introduces a new ultrasound assisted route based on alkali leaching of silica fume for synthesis of colloidal silica nanoparticles. The ef...
متن کاملsynthesis and characterization of some macrocyclic schiff bases
ماکروسیکلهای شیف باز از اهمیت زیادی در شیمی آلی و دارویی برخوردار می باشند. این ماکروسیکلها با دارابودن گروه های مناسب در مکانهای مناسب می توانند فلزاتی مثل مس، نیکل و ... را در حفره های خود به دام انداخته، کمپلکسهای پایدار تولید نمایند. در این پایان نامه ابتدا یک دی آلدئید آروماتیک از گلیسیرین تهیه می شود و در مرحله بعدی واکنش با دی آمینهای آروماتیک و یا آلیفاتیک در رقتهای بسیار زیاد منجر به ت...
15 صفحه اولSynthesis of nanosilica from silica fume using an acid-base precipitation technique and PVA as a nonionic surfactant
The purpose of the present study was to synthesize and characterize nanosilica from alkali-extraction of silica fume under controlled conditions using poly (vinyl alcohol) (PVA) as a dispersing agent. The dissolution efficiency of silica fume was affected by various factors such as concentration of the reagent, reaction time and temperature. A maximum dissolution efficiency of 91% was achieved ...
متن کاملUltrasound Assisted Green Synthesis and Characterization of Graphene Oxide
Graphene oxide (GO) was prepared by an improved green chemical method using graphite flakes, KMnO4, a mixture of H2SO4/H3PO4, H2O2 and HCl. In several stages, ultrasound was used to separate the oxidized layers of GO. The use of ultrasound optimizes the effect of the reacting agents, decreasing the required amou...
متن کاملEffects of Colloidal Nanosilica on Epoxy-based Nanocomposite Coatings
Epoxy-based nanocomposites were fabricated with different content of colloidal silica nanoparticles such as 10.0, 20.0 and 30.0 wt %, through solution casting. The covalent bonding interfaces, resulting from a ring-opening reaction between silica nanoparticles and epoxy matrix were confirmed by the Fourier transform (FT-IR) infrared spectroscopy. These nanocomposites were characterized for ...
متن کاملمنابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
international journal of nanoscience and nanotechnologyناشر: iranian nano society
ISSN 1735-7004
دوره 10
شماره 3 2014
کلمات کلیدی
میزبانی شده توسط پلتفرم ابری doprax.com
copyright © 2015-2023