采用滴涂法制备石墨烯(GR)修饰的玻碳电极(GCE),通过电化学富集Bi沉积在GR表面,得到GR/Bi-GCE修饰电极。用方波溶出伏安法研究了Cd2+和Pb2+在GR/Bi-GCE上的电化学行为。在0.1 mol/L p H 4.5的醋酸缓冲溶液中,在!1.1 V富集0.5 mg/L Bi(NO...采用滴涂法制备石墨烯(GR)修饰的玻碳电极(GCE),通过电化学富集Bi沉积在GR表面,得到GR/Bi-GCE修饰电极。用方波溶出伏安法研究了Cd2+和Pb2+在GR/Bi-GCE上的电化学行为。在0.1 mol/L p H 4.5的醋酸缓冲溶液中,在!1.1 V富集0.5 mg/L Bi(NO3)3溶液210 s后,溶出峰电流与Cd2+和Pb2+的浓度在0.01~85.0μmol/L范围内呈良好的线性关系,检出限均为0.003μmol/L。实验结果表明,此修饰电极对Cd2+和Pb2+均有较好的电化学活性,可对两种物质实现同时测定,具有较高的灵敏度和稳定性。将此电极用于板蓝根中Cd2+和Pb2+的含量测定,结果令人满意。展开更多
Ethylene-octene copolymer (POE) samples exposed to γ-radiation under a series doses were investigated using solid state ~ 13 C-NMR.The chemical shifts of POE were assigned, and the peak evolution as a function of rad...Ethylene-octene copolymer (POE) samples exposed to γ-radiation under a series doses were investigated using solid state ~ 13 C-NMR.The chemical shifts of POE were assigned, and the peak evolution as a function of radiation dose was discussed.An obviously chain scission was found near the branch carbons, and the ~ 13 C-NMR spectra of the corresponding gels confirmed the result.Linewidths of irradiated POE samples of various absorbed doses were observed to which were related to the molecular mobility of the radiation-crosslinked polymer.展开更多
以甲基丙烯酸丁酯、苯乙烯、八甲基环四硅氧烷(D4)为分散相,偶氮二异丁腈(azobisisobutyronitrile,AIBN)为引发剂,通过超浓乳液聚合制各具有一定核一壳结构的复合高分子材料.采用透射电镜(transmission electron microscopy,TEM)观测了...以甲基丙烯酸丁酯、苯乙烯、八甲基环四硅氧烷(D4)为分散相,偶氮二异丁腈(azobisisobutyronitrile,AIBN)为引发剂,通过超浓乳液聚合制各具有一定核一壳结构的复合高分子材料.采用透射电镜(transmission electron microscopy,TEM)观测了材料的形态特征,并表征了共聚物的吸水率和接触角.结果表明,所制备的超浓乳液体系具有良好的稳定性,聚合材料耐水性较好.展开更多
文摘采用滴涂法制备石墨烯(GR)修饰的玻碳电极(GCE),通过电化学富集Bi沉积在GR表面,得到GR/Bi-GCE修饰电极。用方波溶出伏安法研究了Cd2+和Pb2+在GR/Bi-GCE上的电化学行为。在0.1 mol/L p H 4.5的醋酸缓冲溶液中,在!1.1 V富集0.5 mg/L Bi(NO3)3溶液210 s后,溶出峰电流与Cd2+和Pb2+的浓度在0.01~85.0μmol/L范围内呈良好的线性关系,检出限均为0.003μmol/L。实验结果表明,此修饰电极对Cd2+和Pb2+均有较好的电化学活性,可对两种物质实现同时测定,具有较高的灵敏度和稳定性。将此电极用于板蓝根中Cd2+和Pb2+的含量测定,结果令人满意。
文摘Ethylene-octene copolymer (POE) samples exposed to γ-radiation under a series doses were investigated using solid state ~ 13 C-NMR.The chemical shifts of POE were assigned, and the peak evolution as a function of radiation dose was discussed.An obviously chain scission was found near the branch carbons, and the ~ 13 C-NMR spectra of the corresponding gels confirmed the result.Linewidths of irradiated POE samples of various absorbed doses were observed to which were related to the molecular mobility of the radiation-crosslinked polymer.
文摘以甲基丙烯酸丁酯、苯乙烯、八甲基环四硅氧烷(D4)为分散相,偶氮二异丁腈(azobisisobutyronitrile,AIBN)为引发剂,通过超浓乳液聚合制各具有一定核一壳结构的复合高分子材料.采用透射电镜(transmission electron microscopy,TEM)观测了材料的形态特征,并表征了共聚物的吸水率和接触角.结果表明,所制备的超浓乳液体系具有良好的稳定性,聚合材料耐水性较好.
