The Open Materials Science Journal最新文献_第10页

Rheological and Kinetic Characterization of UV Photopolymerizable Formulations as a Function of the Boehmite Nanoparticle Content 紫外光聚合配方的流变性和动力学表征与纳米薄水铝石含量的关系

The Open Materials Science Journal Pub Date : 2012-11-01 DOI: 10.2174/1874088X01206010068

M. Frigione, C. E. Corcione

{"title":"Rheological and Kinetic Characterization of UV Photopolymerizable Formulations as a Function of the Boehmite Nanoparticle Content","authors":"M. Frigione, C. E. Corcione","doi":"10.2174/1874088X01206010068","DOIUrl":"https://doi.org/10.2174/1874088X01206010068","url":null,"abstract":"Several innovative photopolymerizable siloxane-modified acrylic formulations were characterized, both in presence or absence of organically Boehmite (OMB) nanoparticles, in order to assess their rheological and kinetic behavior. The experimental formulations were mainly intended for the surface protection of porous stones or wood elements. The importance of the experimental investigation lies in the specific requirements necessary for the proposed applications, i.e. the innovative UV coatings developed should possess adequate viscosity, photopolymerization reaction rate and time. The kinetics of the radical photopolymerization mechanism, induced by UV radiations, was studied by calorimetric analysis and FTIR spectroscopy as function of the mixtures composition and test conditions (air or nitrogen atmosphere). The addition of a silane coupling agent or a high molecular weight polysiloxane monomer to the acrylic resin was found to reduce the heat of reaction. On the other hand, the presence of Boehmite nanoparticles in the UV photopolymerizable formulations does not seem to modify the reactivity of the siloxane-modified acrylic formulations. The effect of the presence of oxygen on the kinetic reaction was also investigated and correlated to the composition of the systems. Finally, the viscosity of the formulations was studied at ambient temperature with a parallel plates rheomether as a function of composition and shear rate. The viscosity curves were also fitted according to theoretical models as function of shear rate and composition, obtaining a good agreement between experimental data and model predictions.","PeriodicalId":22791,"journal":{"name":"The Open Materials Science Journal","volume":"273 1","pages":"68-76"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74738071","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

The Theoretical and Experimental Investigation into Technological Parameters of High-Melting Metal Arc Spraying 高熔点金属电弧喷涂工艺参数的理论与实验研究

The Open Materials Science Journal Pub Date : 2012-08-06 DOI: 10.2174/1874088X01206010060

Changhe Li, Sheng Wang, Yucheng Ding

引用次数: 3

Acid Treatment of Crushed Brick (from Central African Republic) and its Ability (After FeOOH Coating) to Adsorb Ferrous Ions from Aqueous Solutions 破碎砖(产自中非共和国)的酸处理及其(经FeOOH涂层后)对水溶液中亚铁离子的吸附能力

The Open Materials Science Journal Pub Date : 2012-07-13 DOI: 10.2174/1874088X01206010050

S. C. Dehou, M. Wartel, P. Recourt, B. Revel, A. Boughriet

{"title":"Acid Treatment of Crushed Brick (from Central African Republic) and its Ability (After FeOOH Coating) to Adsorb Ferrous Ions from Aqueous Solutions","authors":"S. C. Dehou, M. Wartel, P. Recourt, B. Revel, A. Boughriet","doi":"10.2174/1874088X01206010050","DOIUrl":"https://doi.org/10.2174/1874088X01206010050","url":null,"abstract":"Brick made by craftsmen in Central African Republic was treated at 50°C and 90°C with a 6M solution of hydrochloride acid for different time lengths. Total chemical compositions of leached samples were determined by ICP- AES and their chemical, mineralogical and morphological/textural properties were characterized by using an environmental scanning electron microscope equipped with an energy dispersive X-ray spectrometer, 27 Al solid-state MAS NMR spectrometry, N2 adsorption - desorption (BET) method. The acid-modified brick was found to possess a higher surface area as a result of structural and compositional collapses with significant Fe an Al losses which reached up to 85 wt.% for Fe and 55 wt.% for Al. Pore size distributions had allowed us to show the predominance of mesoporous structures with roughly two pore-diameter maxima at 7.6 nm and 14.6 nm. Higher surface acidity was also detected on HCl-treated brick pellets, indicating the generation of Bronsted and/or Lewis acid sites on their surfaces; These acid centers were evidenced by 1 H-MAS NMR spectrometry and also by FT-IR using pyridine as a probe molecule. The quantification of these acid sites was performed firstly by pHmetry with a NaOH solution under a strictly controlled N2 atmosphere, and secondly by adsorption - desorption studies of pyridine versus temperature using ThermoGravimetric (TGA)/Differential Thermal (DTA) analyses and TGA coupled to Mass spectrometry. The acid treatment of brick led to a higher surface area mesoporous material that was used in the present work as an adsorbent for removing Fe 2+ ions from aqueous solutions after deposition of iron oxy-hydroxides. The efficiency of this new composite was confirmed in the laboratory by carrying out fixed-bed column experiments.","PeriodicalId":22791,"journal":{"name":"The Open Materials Science Journal","volume":"24 1","pages":"50-59"},"PeriodicalIF":0.0,"publicationDate":"2012-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79210211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Study on a Composite Fiberboard with Multiple Electromagnetic Shielding Effectiveness 复合纤维板多重电磁屏蔽性能的研究

The Open Materials Science Journal Pub Date : 2012-05-18 DOI: 10.2174/1874088X01206010044

C. Su, Q. Yuan, Wei-xing Gan, Dawang Dai, Huang Jingda, Yuanyi Huang

引用次数: 6

GMI Effect of Ultra-Soft Magnetic Soft Amorphous Microwires 超软磁软非晶微丝的GMI效应

The Open Materials Science Journal Pub Date : 2012-05-10 DOI: 10.2174/1874088X01206010039

A. Zhukov, M. Ipatov, J. Blanco, V. Zhukova

引用次数: 4

Preparation and Characterization of Continuous Fe-Containing Silicon Carbide Radar Absorbing Fibers from Precursor-Based Processing 基于前驱体的连续含铁碳化硅雷达吸收光纤的制备与表征

The Open Materials Science Journal Pub Date : 2012-04-20 DOI: 10.2174/1874088X01206010034

Zhi-Yan Chen, Jun Wang, Xiaodong Li, Hao Wang

引用次数: 0

Synthesis and Electronical Property of Antimony-Substituted Polysilanes and Iron-Substituted Polysilanes 锑取代聚硅烷和铁取代聚硅烷的合成及其电子性能

The Open Materials Science Journal Pub Date : 2012-04-20 DOI: 10.2174/1874088X01206010028

Xin Xing, Aiqing Gguo, Lin Liu, Xiaodong Li

引用次数: 1

Influence of Monomer Structures on the High Temperature Properties of Poly((Alkylamino)Borazine))s Derived BN 单体结构对聚((烷基胺)硼嗪)衍生BN高温性能的影响

The Open Materials Science Journal Pub Date : 2012-04-20 DOI: 10.2174/1874088X01206010023

Y. Lei, Yingde Wang, Yongcai Song

引用次数: 1

Editorial - Polymer-Derived Ceramics (PDCs) 编辑-聚合物衍生陶瓷(PDCs)

The Open Materials Science Journal Pub Date : 2012-04-20 DOI: 10.2174/1874088X01206010022

Zengyong Chu

引用次数: 0

A comparative study of corrosive-erosive effects at AISI D3 steel, 304 stainless steel and CrN/AlN material AISI D3钢、304不锈钢和CrN/AlN材料腐蚀侵蚀效果的比较研究

The Open Materials Science Journal Pub Date : 2012-02-17 DOI: 10.2174/1874088X01206010014

J. Caicedo, G. Cabrera, H. H. Caicedo, W. Aperador

{"title":"A comparative study of corrosive-erosive effects at AISI D3 steel, 304 stainless steel and CrN/AlN material","authors":"J. Caicedo, G. Cabrera, H. H. Caicedo, W. Aperador","doi":"10.2174/1874088X01206010014","DOIUrl":"https://doi.org/10.2174/1874088X01206010014","url":null,"abstract":"Corrosive-erosive effect on AISI D3 steel, 304 stainless steel and CrN/AlN coating in aqueous NaCl slurries was studied. CrN/AlN multilayer films with a thickness of 3 � m and bilayer period of � = 60 nm (50 bilayers) were obtained by using the physical vapor deposition (PVD) technique (magnetron sputtering). The corrosion-erosion experiments were performed in a test machine in which the impingement velocity, impact angle, concentration of solids and pH of the solution were controlled. Polarization curves were simultaneously obtained to correlate the electrochemical effects to the erosive wear mechanisms. The slurry used consists of silica particles suspended in a mixture of acid solution and 3.5% NaCl, with a pH value of 5.6. Electrochemical results showed the best corrosion resistance for 304 stainless steels. Additionally, the surface analysis by SEM micrograph revealed formation of cracks in CrN/AlN multilayers coating and plastic deformation in both steel substrates (AISI D3 steel, 304 stainless steel), especially when the mean impact angle is a critical value of 90°. Measurements of critical and passive current densities showed that the behavior of coated materials differed depending on the substrate that is used. Nonetheless, in a general way, by increasing the impact angle and by changing its incidence from normal to grazing, it led to a resistance to corrosion-erosion processes.","PeriodicalId":22791,"journal":{"name":"The Open Materials Science Journal","volume":"47 1","pages":"14-21"},"PeriodicalIF":0.0,"publicationDate":"2012-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75559000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3