نتایج جستجو برای: آلکیل تریمتوکسیاکتادسیلسیلان tmos
تعداد نتایج: 912 فیلتر نتایج به سال:
هدف ما در این پروژه استفاده از معرف پلیمری پلی (4 - وینیل پیریدین) مشبک شده حاوی یون تیوسیانات، برای تبدیل الکل ها به آلکیل تیوسیانات های مربوطه تحت شرایط ملایم است. زیرا این ترکیبات در حرارت های طولانی مدت بیش از °c50 و نیز در محیط اسیدی ناپایدار بوده و به ایزومر ایزوتیوسیانات تبدیل می شوند. روش های متعددی برای تهیه آلکیل تیوسیانات ها گزارش شده است که دارای مشکلاتی از جمله استفاده از عوامل اکس...
Amorphous strategy to nickel oxide nanosheets for highly active and selective hydrogenation reaction
Transition metal oxides (TMOs) as low-cost hydrogenation catalysts exhibit high selectivity and durability. However, due to the lack of activation sites required for H2 dissociation, harsh conditions such pressure (1–5 MPa H2) temperature (100–250°C) are usually needed achieve activation. Herein, we developed an amorphous nickel oxide nanosheets with exceptionally low coordination number Ni-Ni ...
in this work, the effect of immobilization of bread yeast (saccharomyces cerevisiae) by sol-gel technique combined with functionalized nanoporous silica was investigated in different weight ratios of silica containing materials (tmos: lus-1). the activities of immobilized yeast in days after immobilization were examined. the results showed immobilization maintain the yeast life for a longer tim...
MXenes are a class of 2D/layered materials which highly conductive, hydrophilic, have large electrochemical surface area and easily processible into electrodes for energy applications. Since the discovery over ten years ago, these been mainly used in preparation batteries supercapacitors. However, due to their aforementioned properties, could potentially be utilised as component catalyst layer ...
Silica, silica/polydimethylsiloxane and silica/polydimethylsiloxane/ calcium xerogels were examined as polymeric carriers for the controlled release of drug—Metronidazole. Characterization assays comprised analysis of the matrix by Fourier transform infrared spectroscopy (FTIR), determining the specific surface area of solids (BET) and scanning electron microscope (SEM) techniques and further m...
High Dynamic Range (HDR) video acquisition and display is now achievable thanks to recent advances in the HDR field. Tone Mapping Operators (TMOs) convert HDR images to Low Dynamic Range (LDR) ones. However, these operators do not take into account the temporal correlation present in a video sequence. We first present in this article, two main issues that arise when dealing with video tone mapp...
Two-dimensional electron gases (2DEGs) at transition-metal oxide (TMO) interfaces, and boundary states in topological insulators, are being intensively investigated. The former system harbors superconductivity, large magneto-resistance, and ferromagnetism. In the latter, honeycomb-lattice geometry plus bulk spin-orbit interactions lead to topologically protected spin-polarized bands. 2DEGs in T...
Given any metric that compares images of different dynamic range, we propose a method to reduce their distance with respect to this metric. The key idea is to consider the metric as a non local operator. Then, we transform the problem of distance reduction into a non local variational problem. In this context, the low dynamic range image having the smallest distance with a given high dynamic ra...
آلکیل آزیدها از طریق روش های مختلفی سنتز شده اند. اما در این روش ها معایب و محدودیت هایی وجود دارد از جمله استفاده از گاز خطرناک و سمی hn3 که به عنوان منبع آزید مورد استفاده قرار می گیرد، مقرون به صرفه نبودن به دلیل بالا بودن هزینه حلال، کاتالیزور انتقال فاز، مایع یونی، جداسازی مشکل محصول، استفاده از حلال هایی مانندthf وdmso ، مدت زمان طولانی واکنش، راندمان پایین، دمای بالا. با توجه به معایب و...
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