检索结果-南通市图书馆

Syntheses,Structures and Properties of Lanthanide Coordination Polymers Constructed from mixed acid

Chinese Journal of Structural Chemistry 2012年第1期31卷 27-32页

作者：孙长艳吕琼张慧燕李文军常志东郑向军 School of Chemical and Biological Engineering University of Science and Technology School of Chemistry Beijing Normal University

Two new coordination polymers,[Ln（oba）（ox）0.5（H2O）2]n（Ln = Ho（1）,Eu（2）;H2oba = 4,4？-oxybis（benzoic acid）,H2ox = oxalic acid） have been synthesized under hydrothermal *** to single-crystal X-ray diffraction analyses,complex 1 crystallizes in the monoclinic system,space group P21/c with a = 13.783（2）,b =10.0120（15）,c = 12.1974（18） ,β = 105.217（2）°,V = 1624.2（4） 3,C15H12O9Ho,Mr = 501.18,Z = 4,Dc = 2.050 g/cm3,F（000） = 964,μ = 4.919 mm-1,λ（MoKα） = 0.71073 ？,GOOF = 1.124,the final R = 0.0239 and wR = 0.0570 for 3310 independent reflections with Rint = *** 2 and 1 are *** and ox ligands bridge the Ln（III） ions into 2D layers with（4,4） topology,which are further interlinked into a 3D supramolecular network by hydrogen *** curves of the two complexes are studied to examine their thermal ***,complex 2 shows red fluorescence in the solid state at room temperature.

关键词： mixed acid lanthanide ion fluorescent property crystal structure

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A mixed acid methodology to produce thermally stable cellulose nanocrystal at high yield using phosphoric acid

引用

Journal of Bioresources and Bioproducts 2022年第2期7卷 17-26页

作者： Khairatun Najwa Mohd Amin Alireza Hosseinmardi Darren J.Martin Pratheep K.Annamalai Australian Institute for Bioengineering and Nanotechnology(AIBN) the University of QueenslandBrisbaneQLD 4072 Australia Faculty of Chemical and Process Engineering Technology College of Engineering TechnologyUniversiti Malaysia PahangLebuhraya Tun Razak26300 Gambang KuantanPahang D.M.Malaysia

Cellulose nanocrystal(CNC)with distinctive shape-morphology,enhanced thermal stability and dispersibility is essential for overcoming the challenges in processing polymer/CNC nanocom-posites through melt compounding at elevated *** study shows a mixed acid hy-drolysis method to produce CNC with improved thermal stability and high *** use of phosphoric acid(H_(3)PO_(4)),as a mild acid,in combination with a strong acid either sulphuric acid(H_(2)SO_(4))or hydrochloric acid(HCl)leads to reduced use of strong acids and low impact on our *** influences of acid combination and sequence of addition on the production yield were investigated by retaining the proportion of H_(3)PO_(4)to corrosive acid(H_(2)SO_(4)and HCl)4 to 1,and solid to liquid ratio 1꞉*** methodology has enabled to isolate CNC with higher thermal stability,dispersibility and productivity in terms of amount acid used 1 g of CNC,as compared with single acid *** CNC produced using the combination of H_(3)PO_(4)and HCl exhibits high thermal stability,dispersibility and rod-like shape morphology with length and width of(424±86)and(22±3)nm,***,this approach has reduced H_(3)PO_(4)consumption by 54%as compared with single acid hydrolysis method for the production of same amount of CNC.

关键词： Cellulose nanocrystal(CNC) acid hydrolysis Thermal stability mixed acid Crystallinity Production yield

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Anodising of 2024-T3 aluminium alloy in electrolyte of sulphuric-boric-phosphoric mixed acid containing cerium salt as corrosion inhibitor

引用

Transactions of Nonferrous Metals Society of China 2017年第3期27卷 711-721页

作者： MohsenSAEEDIKHANI MehdiJAVIDI SarehVAFAKHAH Department of Materials Science and Engineering School of EngineeringShiraz UniversityZand StreetShiraz ***Iran

The effect of cerium salt as an inhibitor in anodising of the2024-T3aluminium alloy was *** electronmicroscopy equipped with energy dispersive X-ray spectroscopy was used to study the surface composition of the alloy before andafter surface preparation.A mixed electrolyte of10%sulphuric acid,5%boric acid and2%phosphoric acid containing0.1mol/Lcerium sulphate salt was used as the anodising *** treatment was also done in boiling water and molten stearic *** impedance spectroscopy and salt spray techniques were performed in order to investigate the corrosion behaviourand durability of the oxide films,*** was concluded that the presence of cerium ions in anodising electrolyte resulted inthe increase in homogeneity,the rate of oxide film growth and also the thickness of the oxide layer,owing to the high oxidisingpower of cerium ion.

关键词： aluminium alloy anodising mixed acid cerium salt inhibitor

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Rapid determination of wastewater COD using Mn（H₂PO₄）₂ as catalyst

引用

Journal of Environmental Sciences 1996年第2期8卷 212-217页

作者： Sun, Jianhui Xia, Siqing Sun, Ruixia Institute of Environmental Science Henan Normal University Xinxiang Henan 453002 China

A new rapid determination method of wastewater COD in mixed acid solution H_2SO_4-H_3PO_4,with Mn(H_2PO_4)_2 as catalyst,has been proposed in this paper. Through orthogonal experiment, the optimal test conditions have been determined: Mn(H_2PO_4)_2:0. 3g,H_2SO_4:H_3PO_4=6:1(V/V),reflux time:5 minutes. The results were similar to that of the standard method, but the test time was only 1/24 of that and the test cost decreased 85%.

关键词： COD catalyst mixed acid rapid determination.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：