Ceramic capillary membrane has received much attention due to its relatively high pack density and favorable mechanical strength.However,it is difficult to prepare capillary membrane on its thin support by a dip-coati...Ceramic capillary membrane has received much attention due to its relatively high pack density and favorable mechanical strength.However,it is difficult to prepare capillary membrane on its thin support by a dip-coating method.In this study,alumina microfiltration membranes were prepared on the inner surface of alumina capillary support(outer diameter 4 mm,inner diameter 2.5 mm)by a dip-coating method.Scanning electron microscopy(SEM)observation,gas bubble pressure(GBP)method and membrane permeation test were carried out to evaluate membrane performance.Two major effects in preparation of crack-free membrane,capillary filtration and film-coating,upon the thin support were studied.The as-prepared crack-free membrane presents a narrow pore size distribution,a mean pore size of about 0.6μm and a high pure water flux of 86000 L·m -2 ·h -1 ·MPa.It is proved that the membrane thickness should be sufficiently large to overcome the defects of support surface,but it is only one of the prerequisites for the formation of crack-free membrane.Furthermore,it is demonstrated that the capillary filtration effect is greatly restricted for thin capillary support with the dip-coating method and the film-coating effect plays a crucial role in the formation of crack-free membrane.展开更多
The guiding of 60 keV O6+ions along capillaries in an Al2O3 membrane is studied.The charge state distribution and the angular distribution of the ions transmitted through the capillaries are measured.The ion guiding a...The guiding of 60 keV O6+ions along capillaries in an Al2O3 membrane is studied.The charge state distribution and the angular distribution of the ions transmitted through the capillaries are measured.The ion guiding ability of the concerned capillaries for the used projectile ions is analyzed,and is compared with other results using PC and alumina capillaries.Qualitative agreement is found.Further studies on material influence on the ion guiding power of the capillaries are needed.展开更多
基金Supported by the National High Technology Research and Development Program of China （2007AA030303）, the National Basic Research Program of China （2009CB623400） and the National Natural Science Foundation of China （20776067）.
文摘Ceramic capillary membrane has received much attention due to its relatively high pack density and favorable mechanical strength.However,it is difficult to prepare capillary membrane on its thin support by a dip-coating method.In this study,alumina microfiltration membranes were prepared on the inner surface of alumina capillary support(outer diameter 4 mm,inner diameter 2.5 mm)by a dip-coating method.Scanning electron microscopy(SEM)observation,gas bubble pressure(GBP)method and membrane permeation test were carried out to evaluate membrane performance.Two major effects in preparation of crack-free membrane,capillary filtration and film-coating,upon the thin support were studied.The as-prepared crack-free membrane presents a narrow pore size distribution,a mean pore size of about 0.6μm and a high pure water flux of 86000 L·m -2 ·h -1 ·MPa.It is proved that the membrane thickness should be sufficiently large to overcome the defects of support surface,but it is only one of the prerequisites for the formation of crack-free membrane.Furthermore,it is demonstrated that the capillary filtration effect is greatly restricted for thin capillary support with the dip-coating method and the film-coating effect plays a crucial role in the formation of crack-free membrane.
基金supported by the Doctor Research Foundation of Southwest University of Science and Technology(Grant No.10zx7103)
文摘The guiding of 60 keV O6+ions along capillaries in an Al2O3 membrane is studied.The charge state distribution and the angular distribution of the ions transmitted through the capillaries are measured.The ion guiding ability of the concerned capillaries for the used projectile ions is analyzed,and is compared with other results using PC and alumina capillaries.Qualitative agreement is found.Further studies on material influence on the ion guiding power of the capillaries are needed.
