نتایج جستجو برای: h3po4
تعداد نتایج: 559 فیلتر نتایج به سال:
Phenol was analyzed by both gas chromatography–flame ionization detection (GC–FID) and gas chromatography–mass spectrometry (GC–MS) to compare the techniques and to find out if GCFID is a suitable tool for the analysis of phenol extracted from environmentally important phenol in water. After the treatment of water with CuSO4 and H3PO4, phenol in the water was extracted with dichloromethane. The...
روش های سنتزی جدید و سازگار با محیط زیست با استفاده از کاتالیست های هتروژن و قابل بازیافت p2o5 / al2o3 و h3po4/al2o3جهت انجام واکنش های چند جزئی برای سنتز پیش ماده های دارویی تحت شرایط بدون حلال و در مدت زمان کوتاه و با بازده ی بالا ارائه شده است. تعدادی از این سنتزها به این شرح است: سنتز مشتقات 3و2-دی هیدروکوئینازولینh) -1(4-اونز, سنتز مشتقات 3و4-دی هیدروپیریمیدین- (h1) 2-اونز / تایونز, سن...
In this paper we present a synthesis method for obtaining hydroxyapatite nanopowders by chemical precipitation. As the starting reagents, analytical grade Ca(OH)2, H3PO4 and NH4OH were used. . In order to study the factors that have an important influence on the chemical precipitation process a experimental platform has been designed for hydroxyapatite synthesis. The experimental platform was d...
Cellulose derivatives (Figure 1) have many important commercial applications in the fiber, paper, membrane, polymer and paints industries. However, there are only a limited number of common solvents in which cellulose is soluble; solvents include, carbon disulfide, N,Ndimethylacetamide/lithium chloride (DMAC/LiCl), concentrated inorganic salt (ZnCl/H2O, Ca(SCN)2/H2O) and mineral acids (H2SO4/H3...
The popularity of imatinib in modern medicine has underscored the need for a fast and effective quantification method without the use of expensive instruments. The aim of this study was to develop and validate a relatively fast, cheap and effective HPLC method for the quantification of imatinib in human serum. This method uses a simple preparation step with an Extrelut® NT 3 extraction tube and...
A novel method for analysis of three active components curcumin, demethoxycurcumin and bisdemethoxycurcumin in Curcuma longa L. was developed by HPLC coupled with electrochemical detection. Three curcuminoids were well separated on a C18 column and detected with high sensitivity. A mobile phase containing acetonitrile and 10 mM Na2HPO4-H3PO4 (pH 5.0) (50:50, v/v) was used. Good linearity was ob...
A sensitive quantitative method for the determination of matrine alkaloids in human urine was developed based on hollow fiber liquid-phase microextraction (HF-LPME) combined with HPLC. The influence of the different factors on the HF-LPME efficiency including the pH and ion strength of the donar solution, the pH of the acceptor solution, stirring rate and extraction time were examined. The best...
In order to meet the growing need for smart bionic devices and epidermal electronic systems, biaxial stretchability is essential for energy storage units. Based on porous single-walled carbon nanotube/poly(3,4-ethylenedioxythiophene) (SWCNT/PEDOT) hybrid fiber, we designed and fabricated a biaxially stretchable supercapacitor, which possesses a unique configuration of the parallel buckled hybri...
Hexagonal boron nitride (h-BN) is an insulating compound that is structurally similar to graphite. Like graphene, single sheets of BN are atomically flat, and they are of current interest in few-layer hybrid devices, such as transistors and capacitors, that contain insulating components. While graphite and other layered compounds can be intercalated by redox reactions and then converted chemica...
In this study the effect of sintering process in different temperatures on microstructure and morphological properties of sintered hydroxyapatite (HAp) was investigated. HAp powder was prepared by wet precipitation method from following reagents: Ca(OH)2 + H3PO4 in an alkaline conditions. Thermal analysis (TA), X-Ray diffraction method (XRD), FT-IR spectrometry (FT-IR) and scanning electron mic...
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