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首页> 外文期刊>Journal of Colloid and Interface Science >LIESEGANG RING TYPE STRUCTURES AND BIFURCATION IN SOLID-VAPOR AND LIQUID PHASE REACTIONS BETWEEN COBALT NITRATE AND AMMONIUM HYDROXIDE
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LIESEGANG RING TYPE STRUCTURES AND BIFURCATION IN SOLID-VAPOR AND LIQUID PHASE REACTIONS BETWEEN COBALT NITRATE AND AMMONIUM HYDROXIDE

机译：硝酸钴与氢氧化铵在固相和液相反应中的列斯港环型结构和分叉

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New results on the reaction between (i) cobalt nitrate (A) and ammonium hydroxide (B) in gelatin and (ii) cobalt nitrate (solid) and ammonia vapor are reported. Spatial bifurcation of the blue wave into a number of normal Liesegang type bands is observed in a one-dimensional tube in gel media depending on the concentration of electrolytes and gel, Similar bifurcation is also observed when the reaction was carried out in gel media between two microslides, Results show that K-sp (solubility product), as envisaged in recent theories, plays a significant role in initiating bifurcation depending on K, the magnitude of the product of concentration of A and B, which determines the degree of supersaturation. The value of K at the instant of bifurcation, when (i) concentration of Co(NO3)(2) is alone changed or when (ii) concentration of NH4OH alone is changed, is similar when uncertainties are taken into account. The bifurcation behavior when gel concentration is changed suggests that in case of high gel concentration pore size is affected, thereby influencing the diffusion of ions. The results satisfy the spacing law. The results further satisfy the relation d(2) = m't + C' at any time t, where d is the distance between the lower front of the precipitate and the junction and m' and C' are constants, thereby suggesting that the role of diffusion is vital, as envisaged in various theories of the phenomenon. A colored banded structure separated by air gaps (vacant spaces) is formed when the solid cobalt nitrate reads with ammonia vapor, This type of behavior has not been reported earlier. Initially, a single band is formed in a one-dimensional experiment, but in the course of time (similar to 1 month) several bands are formed simultaneously, The diffusion kinetics in the initial stages of the solid-vapor reaction has been studied in a one-dimensional tube. The data obey the relation xi(2) = kt, where xi is the thickness of the product layer at any time t and k is some constant. Similar studies were made on microslides which showed that during the reaction, a colored product is formed which undergoes change in the sequence pink --> blue --> brown. Results in the one-dimensional case support recent theories which postulate nucleation followed by aggregation. (C) 1997 Academic Press. [References: 32]
机译：报道了（i）明胶中的硝酸钴（A）与氢氧化铵（B）和（ii）硝酸钴（固体）与氨蒸气之间反应的新结果。在一维管中，根据电解质和凝胶的浓度，在一维管中观察到蓝波分成多个正常的Liesegang型谱带的空间分叉;当反应在两种介质之间的凝胶介质中进行时，也观察到类似的分叉。结果表明，最新理论所设想的K-sp（溶解度乘积）在引发分叉方面起着重要作用，取决于K，A和B浓度乘积的大小决定了过饱和度。当考虑到不确定性时，当（i）单独改变Co（NO3）（2）的浓度时或当（ii）单独改变NH4OH的浓度时，分叉瞬间的K值相似。改变凝胶浓度时的分叉行为表明，在高凝胶浓度的情况下，孔径会受到影响，从而影响离子的扩散。结果满足间隔定律。结果在任何时间t都进一步满足关系d（2）= m't + C'，其中d是沉淀物的下部前缘与结之间的距离，m'和C'为常数，从而表明正如现象的各种理论所设想的那样，扩散的作用至关重要。当固态硝酸钴与氨气一起读取时，会形成由气隙（空白空间）分隔的有色带状结构。这种类型的行为尚未见报道。最初，在一维实验中形成一条带，但随着时间的流逝（类似于1个月），同时形成了多个带。已经在固相反应的初始阶段研究了扩散动力学。一维管。数据服从关系xi（2）= kt，其中xi是在任何时间t处产品层的厚度，而k是某个常数。在微玻片上进行了类似的研究，结果表明，在反应过程中，形成了有色产物，该产物经历了粉红色->蓝色->棕色的顺序变化。一维情况下的结果支持最新的理论，这些理论假定成核然后聚集。 （C）1997学术出版社。 [参考：32]

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