The determination of contact angle on porous colloid particles by wicking technique is studied.With commercial porous thin-layer silicagel plate for TLC analysis as model system,it is found that the observed differenc...The determination of contact angle on porous colloid particles by wicking technique is studied.With commercial porous thin-layer silicagel plate for TLC analysis as model system,it is found that the observed difference between liquid penetration velocity in bare and pre-contacted silicagel plates in wicking with n-alkanes is caused by capillary condensation occurred during pre-contacting process instead of dynamic contact angle.Thus only the capillary condensation effect is independently corrected,the contact angle can be obtained by wicking technique.For this purpose a new model describing the wicking in porous thin-layer plates prepared from particles with sub-pores is proposed and the corresponding wicking equations are established by introducing a parameter,tortuosity,which can be calculated independently from adsorption of the wicking liquid vapor on the thin-layer plate,into the typical Washburn equation to correct the capillary condensation effect.Applied to commercial thin-layer silicagel plates,it is found that on both bare and pre-contacted silicagel plates n-alkanes show zero contact angles,while 1-bromonaphthalene,ethylene glycol,diiodomethane,formamide and water show non-zero contact angles.The difference between dynamic advancing and receding angles is found to be very small and their average conld be taken as the equilibrium or Young’s contact angle.With this approximation the measured contact angles of 1-bromonaphthalene and diiodomethane on the silicagel plate are 20.4° and 37.2° respectively,quite in good agreement with that reported in literature.展开更多
目的：探讨婴幼儿法洛四联症（tetralogy of Fallot,TOF）矫治术后,毛细血管渗透症发病机制、诊断及处理.方法：我院2005年3月至2010年1月施行婴幼儿TOF矫治术161例,术后并发毛细血管渗透症6例,男性4例,女性2例,年龄9 ～36个月,平均（8&...目的：探讨婴幼儿法洛四联症（tetralogy of Fallot,TOF）矫治术后,毛细血管渗透症发病机制、诊断及处理.方法：我院2005年3月至2010年1月施行婴幼儿TOF矫治术161例,术后并发毛细血管渗透症6例,男性4例,女性2例,年龄9 ～36个月,平均（8±0.6）个月;体质量8.5～15.5kg,平均（8.2±2.10）kg.全组均及时给予提高胶体渗透压、应用血管活性药、腹膜透析、呼吸机辅助维持呼吸、循环稳定和组织灌注治疗.结果：治愈5例,死亡1例,死于肾、肺、心多脏器衰竭.结论：婴幼儿心脏术后毛细血管渗透症发病机制与补体致炎性介质释放,使毛细血管通透性增加有关,低心排出量综合征（低心排）、呼吸衰竭、急性肾衰竭、脑损害是致死主要原因,及时采用腹膜透析和免疫球蛋白可获得较好疗效.展开更多
文摘The determination of contact angle on porous colloid particles by wicking technique is studied.With commercial porous thin-layer silicagel plate for TLC analysis as model system,it is found that the observed difference between liquid penetration velocity in bare and pre-contacted silicagel plates in wicking with n-alkanes is caused by capillary condensation occurred during pre-contacting process instead of dynamic contact angle.Thus only the capillary condensation effect is independently corrected,the contact angle can be obtained by wicking technique.For this purpose a new model describing the wicking in porous thin-layer plates prepared from particles with sub-pores is proposed and the corresponding wicking equations are established by introducing a parameter,tortuosity,which can be calculated independently from adsorption of the wicking liquid vapor on the thin-layer plate,into the typical Washburn equation to correct the capillary condensation effect.Applied to commercial thin-layer silicagel plates,it is found that on both bare and pre-contacted silicagel plates n-alkanes show zero contact angles,while 1-bromonaphthalene,ethylene glycol,diiodomethane,formamide and water show non-zero contact angles.The difference between dynamic advancing and receding angles is found to be very small and their average conld be taken as the equilibrium or Young’s contact angle.With this approximation the measured contact angles of 1-bromonaphthalene and diiodomethane on the silicagel plate are 20.4° and 37.2° respectively,quite in good agreement with that reported in literature.
文摘目的：探讨婴幼儿法洛四联症（tetralogy of Fallot,TOF）矫治术后,毛细血管渗透症发病机制、诊断及处理.方法：我院2005年3月至2010年1月施行婴幼儿TOF矫治术161例,术后并发毛细血管渗透症6例,男性4例,女性2例,年龄9 ～36个月,平均（8±0.6）个月;体质量8.5～15.5kg,平均（8.2±2.10）kg.全组均及时给予提高胶体渗透压、应用血管活性药、腹膜透析、呼吸机辅助维持呼吸、循环稳定和组织灌注治疗.结果：治愈5例,死亡1例,死于肾、肺、心多脏器衰竭.结论：婴幼儿心脏术后毛细血管渗透症发病机制与补体致炎性介质释放,使毛细血管通透性增加有关,低心排出量综合征（低心排）、呼吸衰竭、急性肾衰竭、脑损害是致死主要原因,及时采用腹膜透析和免疫球蛋白可获得较好疗效.
