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首页> 外文期刊>Clays and clay minerals >THE INFLUENCE OF OXALATE-PROMOTED GROWTH OF SAPONITE AND TALC CRYSTALS ON RECTORITE: TESTING THE INTERCALATION-SYNTHESIS HYPOTHESIS OF 2:1 LAYER SILICATES
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THE INFLUENCE OF OXALATE-PROMOTED GROWTH OF SAPONITE AND TALC CRYSTALS ON RECTORITE: TESTING THE INTERCALATION-SYNTHESIS HYPOTHESIS OF 2:1 LAYER SILICATES

机译：草酸盐促进的钠长石和滑石晶体的生长对累托石的影响：测试2：1层硅酸盐的插层-合成假说

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The intercalating growth of new silicate layers or metal hydroxide layers in the interlayer space of other clay minerals is known from various mixed-layer clay minerals such as illite-smectite (I-S), chlorite-vermiculite, and mica-vermiculite. In a recent study, the present authors proposed that smectite-group minerals can be synthesized from solution as new 2:1 silicate layers within the low-charge interlayers of rectorite. That study showed how oxalate catalyzes the crystallization of saponite from a silicate gel at low temperatures (60℃) and ambient pressure. As an extension of this work the aim of the present study was to test the claim that new 2:1 silicate layers can be synthesized as new intercalating layers in the low-charge interlayers of rectorite and whether oxalate could promote such an intercalation synthesis. Two experiments were conducted at 60℃ and atmospheric pressure. First, disodium oxalate solution was added to a suspension of rectorite in order to investigate the effects that oxalate anions have on the structure of rectorite. In a second experiment, silicate gel of saponitic composition (calculated interlayer charge -0.33 eq/O_10(OH)_2) was mixed with a suspension of rectorite and incubated in disodium oxalate solution. The synthesis products were extracted after 3 months and analyzed by X-ray diffraction and high-resolution transmission electron microscopy (HRTEM). The treatment of ultrathin sections with octadecylammonium (n_C =18) cations revealed the presence of 2:1 layer silicates with different interlayer charges that grew from the silicate gel. The oxalate-promoted nucleation of saponite and talc crystallites on the rectorite led to the alteration and ultimately to the destruction of the rectorite structure. The change was documented in HRTEM lattice-fringe images. The crystallization of new 2:1 layer silicates also occurred within the expandable interlayers of rectorite but not as new 2:1 silicate layers parallel to the previous 2:1 silicate layers. Instead, they grew independently of any orientation predetermined by the rectorite crystal substrate and their crystallization was responsible for the destruction of the rectorite structure.
机译：从各种混合层粘土矿物如伊利石-蒙脱石（I-S），绿泥石-mic石和云母-mic石中已知在其他粘土矿物的层间空间中新的硅酸盐层或金属氢氧化物层的插入生长。在最近的研究中，本作者提出可以从溶液中合成蒙脱石族矿物，作为累托石低电荷夹层中新的2：1硅酸盐层。该研究表明草酸盐如何在低温（60℃）和环境压力下催化硅酸盐凝胶中皂石的结晶。作为这项工作的扩展，本研究的目的是测试以下主张：可以合成新的2：1硅酸盐层，作为累托石低电荷夹层中的新插层，以及草酸盐是否可以促进这种插层合成。在60℃和大气压下进行了两个实验。首先，将草酸二钠溶液添加到累托石的悬浮液中，以研究草酸根阴离子对累托石结构的影响。在第二个实验中，将沙哑酸组成的硅酸盐凝胶（计算的层间电荷为-0.33 eq / O_10（OH）_2）与累托石悬浮液混合，并在草酸二钠溶液中孵育。 3个月后提取合成产物，并通过X射线衍射和高分辨率透射电子显微镜（HRTEM）进行分析。用十八烷基铵（n_C = 18）阳离子处理超薄切片时，发现存在2：1层硅酸盐，具有从硅酸盐凝胶中生长出来的不同层间电荷。草酸盐在皂石上促进的皂石和滑石微晶成核作用导致了累托石结构的改变，并最终导致了累托石结构的破坏。该变化记录在HRTEM晶格条纹图像中。新的2：1层硅酸盐的结晶也发生在累托石的可膨胀夹层中，但不是平行于先前的2：1硅酸盐层的新的2：1硅酸盐层。取而代之的是，它们独立于累托石晶体衬底预定的任何取向生长，并且它们的结晶导致累托石结构的破坏。

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