赵彩霞
,
张伟德
无机材料学报
doi:10.3724/SP.J.1077.2009.01243
以硝酸钙、硫酸钛、磷酸和氨水等为原料, 通过共沉淀水热合成和离子交换法, 制备了钛(Ⅳ)与锌离子共掺杂的羟基磷灰石(Ca10(PO4)6(OH)2, HAp)白色纳米粒子(TiZnHAp). 采用XRD、TEM、EDS、UVVis和ESR测试对样品的结构、形貌、组成、吸光性能以及催化氧化活性进行了表征. 针对大肠杆菌和金黄色葡萄球菌进行了抗菌实验测试, 研究材料在黑暗和室内弱紫外光下的抗菌活性. 结果表明, 钛(Ⅳ)的掺杂没有明显改变HAp晶粒的形态和尺寸, 而钛(Ⅳ)的掺杂能够提高HAp的吸光性能和紫外光催化氧化能力. 相对于ZnHAp和TiHAp颗粒, 在室内弱紫外光下钛(Ⅳ)的光催化分解细菌与锌离子抗菌协同作用使TiZnHAp具有优良的抗菌效果. 同时, 离子溶出测试实验结果表明, TiZnHAp具有长效抗菌性.
关键词:
载钛锌纳米羟基磷灰石
,
weak UV light
,
antibacterial
,
synergistic effect
S. Atashin
金属学报(英文版)
In this article the corrosion rate of the austenitic stainless steel type 304, under the synergistic effect of environmental factors has been assessed via potentiodynamic polarization scan. Salinity, velocity, pH and temperature are the factors which induce effects on the corrosion rate of the considered metal. Quantitative analysis is applied using the full two-level factorial experimental design method, which results in the contribution value of each parameter in changing the quantity of average corrosion rate in both individual and synergistic cases. Besides this quantitative analysis, qualitative analysis has been used to predict the variation direction. These two analyses show the important role of the synergistic action, which changes the variation direction of corrosion rate and the contribution percentage of each parameter in varying the value of corrosion rate. Applying both these analyses can show the magnitude and quality of each parameter's effect, which is remarkably valuable in marine applications.
关键词:
Stainless steel 304
,
environmental parameters
,
seawater corrosion
,
synergistic effect
卢林刚
,
陈英辉
,
王舒衡
,
杨守生
,
董希琳
材料研究学报
在新型膨胀性阻燃剂六(4-DOPO羟甲基苯氧基)环三磷(DOPOMPC)与聚磷酸铵(APP)复配作用的环氧树脂(EP)膨胀阻燃复合材料(DOPOMPC/APP/EP)的基础上,添加有机改性蒙脱土(OMMT)制备了新型磷氮膨胀性阻燃剂/OMMT协同阻燃环氧树脂.用极限氧指数(LOI)、水平燃烧(UL-94)、锥形量热(CONE)、电子显微镜(SEM)观察等方法研究了OMMT与DO-POMPC的协同效应.结果表明,EP4(10％DOPOMPC/10％APP/3％OMMT/77％EP)复合材料的各项燃烧参数综合表现最优,其LOI值达到36.8％,热释放速率峰值(pk-HRR)、有效燃烧热平均值(av-EHC)、比消光面积平均值(av-SEA)、一氧化碳释放率平均值(av-CO)较纯EP(EP0)分别下降了78.4％、62.2％、57.8％和50.0％,呈现出更加优良的阻燃和抑烟性能.其原因是,添加OMMT的阻燃材料在燃烧初期形成的炭层更致密、坚硬.
关键词:
复合材料
,
膨胀阻燃剂
,
环氧树脂
,
有机改性蒙脱土
,
阻燃性能
,
协同效应
