Journal: Materials最新文献_第10页

Sago Starch-Mixed Low-Density Polyethylene Biodegradable Polymer: Synthesis and Characterization 西米淀粉-混合低密度聚乙烯可生物降解聚合物的合成与表征

Journal: Materials Pub Date : 2013-07-10 DOI: 10.1155/2013/365380

E. Hoque, T. Ye, L. Yong, K. M. Dahlan

{"title":"Sago Starch-Mixed Low-Density Polyethylene Biodegradable Polymer: Synthesis and Characterization","authors":"E. Hoque, T. Ye, L. Yong, K. M. Dahlan","doi":"10.1155/2013/365380","DOIUrl":"https://doi.org/10.1155/2013/365380","url":null,"abstract":"This research focuses on synthesis and characterization of sago starch-mixed LDPE biodegradable polymer. Firstly, the effect of variation of starch content on mechanical property (elongation at break and Young’s modulus) and biodegradability of the polymer was studied. The LDPE was combined with 10%, 30%, 50%, and 70% of sago for this study. Then how the cross-linking with trimethylolpropane triacrylate (TMPTA) and electron beam (EB) irradiation influence the mechanical and thermal properties of the polymer was investigated. In the 2nd study, to avoid overwhelming of data LDPE polymer was incorporated with only 50% of starch. The starch content had direct influence on mechanical property and biodegradability of the polymer. The elongation at break decreased with increase of starch content, while Young’s modulus and mass loss (i.e., degradation) were found to increase with increase of starch content. Increase of cross-linker (TMPTA) and EB doses also resulted in increased Young’s modulus of the polymer. However, both cross-linking and EB irradiation processes rendered lowering of polymer’s melting temperature. In conclusion, starch content and modification processes play significant roles in controlling mechanical, thermal, and degradation properties of the starch-mixed LDPE synthetic polymer, thus providing the opportunity to modulate the polymer properties for tailored applications.","PeriodicalId":17611,"journal":{"name":"Journal: Materials","volume":"70 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2013-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77453585","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: 33

PLD Grown Polycrystalline Tungsten Disulphide (WS2) Films PLD生长的多晶二硫化钨(WS2)薄膜

Journal: Materials Pub Date : 2013-07-09 DOI: 10.1155/2013/603648

Salman Alfihed, M. I. Hossain, A. Alharbi, A. Alyamani, F. Alharbi

引用次数: 16

Nanostructured TiO2 Doped with Nb as a Novel Support for PEMFC 纳米TiO2掺杂Nb作为PEMFC的新型载体

Journal: Materials Pub Date : 2013-05-30 DOI: 10.1155/2013/706513

E. Valenzuela, V. Ramos-Sánchez, A. A. L. Arista, O. Savadogo

引用次数: 7

Enhanced Performance of Membraneless Sodium Percarbonate Fuel Cells 无膜过碳酸钠燃料电池性能的提高

Journal: Materials Pub Date : 2013-05-22 DOI: 10.1155/2013/548026

M. Gowdhamamoorthi, A. Arun, S. Kiruthika, B. Muthukumaran

引用次数: 14

Microwave Assisted Synthesis of ZnO Nanoparticles: Effect of Precursor Reagents, Temperature, Irradiation Time, and Additives on Nano-ZnO Morphology Development 微波辅助合成纳米氧化锌:前驱体、温度、辐照时间和添加剂对纳米氧化锌形貌的影响

Journal: Materials Pub Date : 2013-05-14 DOI: 10.1155/2013/478681

G. Barreto, G. Morales, M. Quintanilla

引用次数: 95

Direct Current Magnetron Glow Discharge Plasma Characteristics Study for Controlled Deposition of Titanium Nitride Thin Film 控制沉积氮化钛薄膜的直流磁控管辉光放电等离子体特性研究

Journal: Materials Pub Date : 2013-05-09 DOI: 10.1155/2013/852859

S. M. Borah

引用次数: 9

Dielectric Properties of PbNb2O6 up to 700°C from Impedance Spectroscopy 阻抗谱法测定PbNb2O6高达700°C的介电性能

Journal: Materials Pub Date : 2013-05-08 DOI: 10.1155/2013/702946

K. Sahu, U. De

{"title":"Dielectric Properties of PbNb2O6 up to 700°C from Impedance Spectroscopy","authors":"K. Sahu, U. De","doi":"10.1155/2013/702946","DOIUrl":"https://doi.org/10.1155/2013/702946","url":null,"abstract":"Piezoelectric materials have wide band gap and no inversion symmetry. Only the orthorhombic phase of lead metaniobate (PbNb2O6) can be ferroelectric and piezoelectric below Curie temperature, but not the rhombohedral phase. High temperature piezoelectric applications in current decades have revived international interest in orthorhombic PbNb2O6, synthesis of which in pure form is difficult and not well documented. Second problem is that its impedance spectroscopy (IS) data analysis is still incomplete. Present work attempts to fill up these two gaps. Presently found synthesis parameters yield purely orthorhombic PbNb2O6, as checked by X-ray Rietveld analysis and TEM. Present 20 Hz to 5.5 MHz IS from room temperature to 700°C shows its ferroelectric Curie temperature to be one of the highest reported, >574°C for 0.5 kHz and >580°C for 5.5 MHz. Dielectric characteristics and electrical properties (like capacitance, resistance and relaxation time of the equivalent CR circuit, AC and DC conductivities, and related activation energies), as derived here from a complete analysis of the IS data, are more extensive than what has yet been reported in the literature. All the properties show sharp changes across the Curie temperature. The temperature dependence of activation energies corresponding to AC and DC conductivities has been reexamined.","PeriodicalId":17611,"journal":{"name":"Journal: Materials","volume":"28 1","pages":"1-15"},"PeriodicalIF":0.0,"publicationDate":"2013-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74799142","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: 11

Effect of Deposition Time on the Morphological Features and Corrosion Resistance of Electroless Ni-High P Coatings on Aluminium 沉积时间对铝表面ni -高P化学镀层形貌及耐蚀性的影响

Journal: Materials Pub Date : 2013-05-08 DOI: 10.1155/2013/985763

N. Sridhar, K. Bhat

引用次数: 9

Effects of ThermoMechanical Coupling in Tribological Surface Transformations: A One-Dimensional Modelling Including Irreversible Solid-Solid Phase Transformations and Classical Plasticity 热-机械耦合对摩擦学表面转化的影响:包括不可逆固-固相变和经典塑性的一维模型

Journal: Materials Pub Date : 2013-04-28 DOI: 10.1155/2013/892050

G. Antoni

引用次数: 2

Synthesis of Hydroxyapatite Nanoparticles in Presence of a Linear Polysaccharide 线性多糖存在下羟基磷灰石纳米颗粒的合成

Journal: Materials Pub Date : 2013-04-23 DOI: 10.1155/2013/683268

H. M. Romero, J. Ruacho, C. A. Pérez, P. E. Casillas

{"title":"Synthesis of Hydroxyapatite Nanoparticles in Presence of a Linear Polysaccharide","authors":"H. M. Romero, J. Ruacho, C. A. Pérez, P. E. Casillas","doi":"10.1155/2013/683268","DOIUrl":"https://doi.org/10.1155/2013/683268","url":null,"abstract":"Hydroxyapatite nanoparticles compounds were synthesized. Natural hydroxyapatite and a linear polysaccharide (1–3 linked β-D galactopyranose and 1,4 linked 3,6 anhydro-α-L-galactopyranose) were used as a precursor in its formation. Our purpose was to produce nanoparticles in the presence of a linear polysaccharide with the use of a gelification method. The powder sample was evaluated by scanning tunneling microscope (STM), Brunauer-Emmett-Teller (BET) analysis, X-ray diffraction pattern (XRD), differential thermal analysis (DTA), infrared (IR) analysis, and thermal gravimetric analysis (TGA). According to the results, it was found that these nanoparticles can successfully be synthesized using a polysaccharide in a solution. On the other hand, the XRD peak intensity corresponds to hydroxyapatite structure in the range of temperature of 810°C. The influence of the polysaccharide on the evolution of the nanoparticles has been demonstrated. This observation opens up new routes for the fabrication of nanoparticles using polysaccharides network. The synthesized nanoparticles have diameters ranging from 10 nm to 11 nm approximately. The elaboration conditions such as pH and concentration were optimized in this solution.","PeriodicalId":17611,"journal":{"name":"Journal: Materials","volume":"14 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2013-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82921777","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: 6