SHA Qing-yun
,
HUANG Guo-jian
,
GUAN Ju
,
MA Xiao-jun
,
LI Da-hang
钢铁研究学报(英文版)
The precipitates on austenite grain boundaries in an Nb-V-Ti microalloyed steel have been investigated by transmission electron microscope (TEM) examination of carbon extraction replica. The replica was prepared from specimen etched with saturated picric solution rather than Nital which is conventionally used. Then particles on both grain boundaries and triple point of grain boundaries were clearly observed and identified as (Nb,Ti)(C,N) particles. In case of conventional way, it is difficult to determine the location of particles with respect to austenite grain boundaries. The number of particles observed in new way developed was greatly reduced compared with that found in replica prepared by the conventional way, which may be caused by the dissolution of partial precipitates during the etching with longer time and at higher temperature involved in new way. Despite this, the new way developed provides an effective way to determine the precipitate particles on austenite grain boundaries.
关键词:
precipitate
,
austenite grain boundary
,
replica
,
etch
史小慧
,
王蕊欣
,
高保娇
,
雷彩萍
,
李艳华
高分子材料科学与工程
首先采用氯甲基化试剂1,4-二氯甲氧基丁烷对水杨羟肟酸(SHA)实施氯甲基化反应,制得氯甲基化水杨羟肟酸(CMSHA);然后以聚甲基丙烯酸羟乙酯(PHEMA)改性的硅胶微粒PHEMA/SiO2为载体,使其表面的醇羟基与CMSHA上的氯甲基基团发生亲向取代反应,制得水杨羟肟酸功能化的复合螯合吸附材料(SHA-PHEMA/SiO2).考察了取代反应的主要影响因素;并研究了SHA-PHEMA/SiO2对重金属离子的螯合性能.结果表明,CMSHA与PHEMA/SiO2之间的取代反应遵循单分子取代反应(SNl)的机理;较高温度下,强极性溶剂有利于反应的进行.SHA-PHEMA/SiO2对不同重金属离子表现出不同的螯合吸附能力,摩尔吸附容量的顺序为Cu2+＞ Zn2+ ＞Cd2+＞ Pb2+;SHA-PHEMA/SiO2对Cu2+离子的吸附动力学符合伪二级速率方程;其吸附行为同时遵循Freundlich和Langmuir模式.
关键词:
水杨羟肟酸
,
聚甲基丙烯酸羟乙酯
,
硅胶
,
亲核取代反应
,
螯合吸附
王蕊欣
,
雷彩萍
,
史小慧
,
王洪静
功能材料
doi:10.3969/j.issn.1001-9731.2016.02.049
采用付-克烷基化反应,使水杨羟肟酸(SHA)键合到氯甲基化聚苯乙烯微球(CMCPS)表面,制得SHA功能化聚苯乙烯微球(SHA/CPS);再以SHA/CPS为配体,与过渡金属离子M(Co(Ⅱ)、Cu(Ⅱ)、Fe(Ⅲ)、Mn(Ⅱ))配位,制备了M-SHA/CPS配合物固体催化剂.研究了M-SHA/CPS在氧气非均相氧化乙苯中的催化行为.结果表明,M-SHA/CPS可有效地催化分子氧氧化乙苯.中心金属离子的电子结构对配合物催化性能有较大影响,其中Fe-SHA/CPS对乙苯氧化为EBHP的催化活性和选择性最高,在100℃下EBHP的含量高达14％.催化剂浓度、助剂四甘醇浓度和温度对Fe-SHA/CPS催化剂的活性和选择性有较大影响.此外,Fe-SHA/CPS具有较好的重复使用性.
关键词:
水杨羟肟酸过渡金属配合物
,
交联聚苯乙烯微球
,
固载
,
催化氧化
,
乙苯
章莎
,
周益春
材料导报
应用纳米压痕法测量残余应力的2种理论模型对5种电沉积镍镀层中的残余应力在不同压痕深度处进行了测量,并与X射线衍射法的测量结果进行了比较.结果表明,压深位于薄膜/基底界面处的2种压痕法测量结果与X射线衍射法的测量结果相近,且Yun-Hee模型与其符合得更好.
关键词:
纳米压痕法
,
电沉积镍镀层
,
残余应力
,
X射线衍射法
