نتایج جستجو برای: nano porosity

تعداد نتایج: 67987  

Journal: :International journal of engineering. Transactions C: Aspects 2021

Rapid urbanization and requirement of infrastructure, stable construction sites are not available. Therefore, there is a dire need for improvement marginal soils to be used as material. However, weak comprise saturated clays, fine silts, loose sand, which susceptible failure pose problems stability. this research aims study the strength microstructural behavior soft treated with nano-alumina (A...

2014

Silicon used in this study: The active material we use in this work is made of Si nanoparticles. Its BET surface was found to be around 13 m².g-1. In addition, XRD (Figure S1) and TEM (Figure S2) characterizations were carried out on this material. Figure S1. XRD diagram of the active material used in this study. The diagram was acquired on a Brücker D8 Advance diffractometer θ-θ configuration ...

Journal: :Inorganic Chemistry Communications 2022

In this work, we investigate the use of a new low-cost gas sensor based on porous silicon to detect low concentration NO2 at room temperature. focused sensing properties two different types (PS) prepared by simple chemical method namely nano-porous (nano-PS) and macro-porous (macro-PS). The sensors are characterized pores size, thicknesses porosity. Electronic synthesized structures were studie...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه ارومیه - دانشکده علوم پایه 1393

در این رساله، روشهای احیایی نوین، بسیار موثر و سبز با استفاده از سدیم سیانو بوروهیدرید برای احیای گروههای عاملی کربونیلی، نیترو و اکسیم به صورت زیر ارائه می شود: - احیای ترکیبات کربونیلی با استفاده از nabh3cn در حضور nano fe3o4/h2so4 در دمای اتاق و شرایط بدون حلال - احیای ترکیبات کربونیلی با استفاده از nabh3cn در حضور nano fe3o4@sio2/h2so4 در دمای اتاق و شرایط بدون حلال - احیای ترکیبات کربون...

2009
Mojtaba Mirzaeian

Organic aerogels were synthesized by sol–gel polymerization of resorcinol (R) with formaldehyde (F) catalyzed by sodium carbonate (C) followed by vacuum drying. The influence of the resorcinol/sodium carbonate ratio (R/C) on the porous structure of the resultant aerogels was investigated. The nitrogen adsorption–desorption measurements show that the aerogels possess a well developed porous stru...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت مدرس - دانشکده علوم پایه 1388

در سالهای اخیر تلاش زیادی برای سنتز کمپلکس های سوپرامولکول و پلیمرهای کوئوردیناسیونی بر مبنای لیگاندهای آلی چند دندانه شده است. این مواد به دلیل داشتن خواص منحصر به فرد، کاربردهای زیادی در صنعت دارند. سنتز پلیمرهای کوئوردیناسیونی جدید از سرب(ii) در ابعاد بالک(توده) و نانو با استفاده از روش گرادیان دمایی و به روش شاخه جانبی صورت گرفته و با روش طیف سنجی ir و پایداری گرمایی آن ها توسط آنالیزهای وز...

Journal: :Materials 2018
Jana S Segmehl Vanessa Studer Tobias Keplinger Ingo Burgert

Functional materials of high porosity and hierarchical structure, based on renewable building blocks, are highly demanded for material applications. In this regard, substantial progress has been made by functionalizing micro- and nano-sized cellulose followed by its reassembly via bottom-up approaches. However, bottom-up assembly processes are still limited in terms of upscaling and the utiliza...

2013
M Zalzale P J McDonald K L Scrivener

A 3D lattice Boltzmann model is developed and used to calculate the water and gas permeabilities of model cement pastes at different degrees of water saturation. In addition to permeable micron-sized capillary pores and impermeable solid inclusions, the lattice Boltzmann model comprises weakly-permeable nano-porous calcium silicate hydrate (C-S-H). The multi-scale problem is addressed by using ...

2017
Chao Yang Ondrej Muránsky Hanliang Zhu Gordon J. Thorogood Maxim Avdeev Hefei Huang Xingtai Zhou

A new generation of alloys, which rely on a combination of various strengthening mechanisms, has been developed for application in molten salt nuclear reactors. In the current study, a battery of dispersion and precipitation-strengthened (DPS) NiMo-based alloys containing varying amounts of SiC (0.5-2.5 wt %) were prepared from Ni-Mo-SiC powder mixture via a mechanical alloying (MA) route follo...

2017
Han-Seung Lee Jitendra Kumar Singh Mohamed A. Ismail

A new technique was accepted to fill the porosity of Al coating applied by arc thermal spray process to enhance corrosion resistance performance in artificial ocean water. The porosity is the inherent property of arc thermal spray coating process. In this study, applied coating was treated with different concentrations of ammonium phosphate mono basic (NH4H2PO4: AP) solution thereafter dried at...

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