中国有色金属学报（英文版）
中國有色金屬學報（英文版）
중국유색금속학보（영문판）
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
2013年
6期
1783-1788
,共6页
蒋昊%谢珍%刘国蓉%俞亚文%张丁
蔣昊%謝珍%劉國蓉%俞亞文%張丁
장호%사진%류국용%유아문%장정
相互作用力%原子力显微镜%白云母%胶体探针%DLVO
相互作用力%原子力顯微鏡%白雲母%膠體探針%DLVO
상호작용력%원자력현미경%백운모%효체탐침%DLVO
interaction forces%atomic force microscope%muscovite%colloidal probe%DLVO
运用原子力显微镜研究了二氧化硅胶体探针(直径，5μm)与白云母表面之间在电解质溶液环境下的相互作用力。试验考察了平衡时间、电解质浓度和溶液pH值对相互作用力的影响。实验结果表明，电解质浓度和溶液pH值对白云母/二氧化硅之间相互作用力及粘附力都产生显著的影响。在低电解质浓度和高的溶液pH值条件下，观察到一个很强的长程排斥力；而在高电解质浓度和低pH值条件下，两表面之间产生一个弱的长程吸引力。随着电解质浓度的增加，相互作用力从强的排斥力变化到强的吸引力。当溶液pH值在5.8~10.2时，相互作用是单调的排斥力；当溶液pH值降低至3.4时，在距离22~32 nm处出现一个弱的吸引力。在低浓度或低pH值下，白云母与二氧化硅之间的粘附力比较大，随着电解质浓度和溶液pH值的增加，粘附力不断减小，最后相对稳定。运用经典DLVO理论对相互作用力进行理论计算，与实验曲线基本一致。
運用原子力顯微鏡研究瞭二氧化硅膠體探針(直徑，5μm)與白雲母錶麵之間在電解質溶液環境下的相互作用力。試驗攷察瞭平衡時間、電解質濃度和溶液pH值對相互作用力的影響。實驗結果錶明，電解質濃度和溶液pH值對白雲母/二氧化硅之間相互作用力及粘附力都產生顯著的影響。在低電解質濃度和高的溶液pH值條件下，觀察到一箇很彊的長程排斥力；而在高電解質濃度和低pH值條件下，兩錶麵之間產生一箇弱的長程吸引力。隨著電解質濃度的增加，相互作用力從彊的排斥力變化到彊的吸引力。噹溶液pH值在5.8~10.2時，相互作用是單調的排斥力；噹溶液pH值降低至3.4時，在距離22~32 nm處齣現一箇弱的吸引力。在低濃度或低pH值下，白雲母與二氧化硅之間的粘附力比較大，隨著電解質濃度和溶液pH值的增加，粘附力不斷減小，最後相對穩定。運用經典DLVO理論對相互作用力進行理論計算，與實驗麯線基本一緻。
운용원자력현미경연구료이양화규효체탐침(직경，5μm)여백운모표면지간재전해질용액배경하적상호작용력。시험고찰료평형시간、전해질농도화용액pH치대상호작용력적영향。실험결과표명，전해질농도화용액pH치대백운모/이양화규지간상호작용력급점부력도산생현저적영향。재저전해질농도화고적용액pH치조건하，관찰도일개흔강적장정배척력；이재고전해질농도화저pH치조건하，량표면지간산생일개약적장정흡인력。수착전해질농도적증가，상호작용력종강적배척력변화도강적흡인력。당용액pH치재5.8~10.2시，상호작용시단조적배척력；당용액pH치강저지3.4시，재거리22~32 nm처출현일개약적흡인력。재저농도혹저pH치하，백운모여이양화규지간적점부력비교대，수착전해질농도화용액pH치적증가，점부력불단감소，최후상대은정。운용경전DLVO이론대상호작용력진행이론계산，여실험곡선기본일치。
Interaction forces between a silica colloidal sphere and a muscovite flat surface in electrolyte solutions were directly measured with an atomic force microscope (AFM). The results showed a significant impact of time, electrolyte concentration and solution pH on both long-range (non-contact) and adhesion (pull-off) force. A strong long-range repulsive force was observed under conditions of lower electrolyte concentration and higher solution pH, while a weak long-range attractive force was observed in the higher electrolyte concentration and lower pH solutions. With the electrolyte concentration increasing, the interaction forces decreased from strong repulsive force to strong attractive force. The measured long-range forces were monotonically repulsive at pH 5.8?10.2 and changed in a small scale. However, when the solution pH decreased to 3.4, a weak attractive force was observed at a separation distance of 22?32 nm. In low electrolyte concentration and pH solutions, the adhesion force between the muscovite and silica is large. With increasing the electrolyte concentration and solution pH, the adhesion force decreased and became relatively stable at last. The measured interaction forces were fitted well with the classical DLVO theory.
