نتایج جستجو برای: step coating

تعداد نتایج: 301171  

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد علوم دارویی - دانشکده داروسازی 1393

خلاصه فارسی: به علت وجود مشکلات استفاده از داروهایی با نیمه عمر کوتاه که نیازمند تجویز چند دوز در طی یک روز می باشند، مانند فراموش کردن دریافت دوز دارو و ثابت نبودن سطح خونی و... ضرورت ساخت اشکال modified release واضح و مبرهن است. از میان راه های مختلف دارورسانی به بدن، راه خوراکی به علت مزایای ویژه خود همچنان از جایگاه مهمی در داروسازی برخوردار می باشد. اشکال دارویی متنوعی نیز این امکان را فر...

2016
B. A. Sun S. H. Chen Y. M. Lu Z. G. Zhu Y. L. Zhao Y. Yang K. C. Chan C. T. Liu

Metallic glasses (MGs) are notorious for the poor macroscopic ductility and to overcome the weakness various intrinsic and extrinsic strategies have been proposed in past decades. Among them, the metal coating is regarded as a flexible and facile approach, yet the physical origin is poorly understood due to the complex nature of shear banding process. Here, we studied the origin of ductile enha...

2017
Mohamed A. Habila Zeid A. ALOthman Ahmed Mohamed El-Toni Joselito Puzon Labis Aslam Khan Adel Al-Marghany Hussein Elsayed Elafifi

Magnetic nanoparticles are used in adsorptive removal of heavy metals from polluted wastewater. However, their poor stability in an acidic medium necessitates their protection with a coating layer. Coating magnetic nanoparticles with carbon showed proper protection but the heavy metal removal efficiency was slightly weak. However, to boost the removal efficiencies of surface functionalization, ...

2017
Paramita Das Helga Thomas Martin Moeller Andreas Walther

Highly loaded polymer/clay nanocomposites with layered structures are emerging as robust fire retardant surface coatings. However, time-intensive sequential deposition processes, e.g. layer-by-layer strategies, hinders obtaining large coating thicknesses and complicates an implementation into existing technologies. Here, we demonstrate a single-step, water-borne approach to prepare thick, self-...

Journal: :The journal of physical chemistry. B 2005
James M Tsay Sören Doose Fabien Pinaud Shimon Weiss

The composition and structure of inorganic shells grown over CdSe semiconductor nanocrystal dots and rods were optimized to yield enhanced photoluminescence properties after ligand exchange followed by coating with phytochelatin-related peptides. We show that, in addition to the peptides imparting superior colloidal properties and providing biofunctionality in a single-step reaction, the improv...

2012
Takashi Okazoe Daisuke Shirakawa Koichi Murata

A new polyfluorinated anti-staining coating material CF3O(CF2CF2O)xCF2-CONHCH2CH2CH2Si(OCH3)3 has been developed by utilizing the PERFECT method, which employs a liquid-phase direct fluorination reaction with elemental fluorine as a key step. Direct fluorination of a partially-fluorinated ester, which was prepared from a non-fluorinated poly(ethylene glycol) and a perfluorinated acyl fluoride, ...

Flavio Deflorian Mohsen Saremi Najmeh Asadi Reza Naderi,

This work is aimed to evaluate the role of nanoclay in the protective performance of an eco-friendly silane sol-gel layer applied on mild steel substrate in 0.1M sodium chloride solution. At the first step, the effect of pH of the silane solution, consisting of a mixture of γ-glycidoxypropiltrimethoxysilane and methyltriethoxysilane and tetraethoxysilane, on the coating performance was evaluate...

Journal: :Langmuir : the ACS journal of surfaces and colloids 2011
Chantal Rufier Mathias Reufer Hervé Dietsch Peter Schurtenberger

We report on a single-step coating process and the resulting colloidal stability of silica-coated spindle-type hematite nanoparticles (NPs) decorated with a layer of poly(acrylic acid) (PAA) polyelectrolyte chains that are partially incorporated into the silica shell. The stability of PAA coated NPs as a function of pH and salt concentration in water was compared to bare hematite particles and ...

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