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Optimization of nanolime solvent for the consolidation of coarse porous limestone

机译：纳米石灰溶剂对粗大多孔石灰石固结的优化

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摘要

The potentialities of nanomaterials for application in the field of conservation have been widely investigated in the last two decades. Among nanomaterials, nanolimes, i.e., dispersions of lime nanoparticles in alcohols are promising consolidating products for calcareous materials. Nanolimes are effective in recovering the very superficial loss of cohesion of decayed materials, but they do not always provide sufficient mass consolidation. This limitation is mainly related to the deposition of the nanoparticles nearby the surface of the material. Experimental research has been set up with the aim of improving the in-depth deposition of lime nanoparticles. Previous research by the authors has shown that nanolime deposition within a substrate can be controlled by adapting the nanolimes properties (kinetic stability and evaporation rate) to the moisture transport behavior of the substrate. Nanolime properties can be modified by the use of different solvents. In this research, nanolime dispersions have been further optimized for application on Maastricht limestone, a coarse porous limestone. Firstly, nanolimes were synthesized and dispersed in ethanol and/or water, both pure and mixed in different percentages. Subsequently, based on the kinetic stability of the nanolime dispersions, the most promising solvent mixtures were selected and applied on the limestone. The deposition of lime nanoparticles within the limestone was studied by phenolphthalein test, optical microscopy and scanning electron microscopy. The results confirm that nanolime dispersed in a mixture of ethanol (95 %) and water (5 %) can guarantee a better nanoparticles in-depth deposition within coarse porous substrates, when compared to dispersions in pure ethanol.
机译：在过去的二十年中，已经广泛研究了纳米材料在保护领域中的应用潜力。在纳米材料中，纳米石灰，即石灰纳米颗粒在醇中的分散体，有望成为钙质材料的固结产品。纳米胶可有效地恢复已腐烂材料的内聚力的表面损失，但它们并不总是提供足够的质量固结。该限制主要与纳米粒子在材料表面附近的沉积有关。为了改善石灰纳米颗粒的深度沉积，已经进行了实验研究。作者先前的研究表明，可以通过使纳米石灰的特性（动力学稳定性和蒸发速率）适应基底的水分传输行为来控制其在基底中的沉积。纳米石灰的性质可以通过使用不同的溶剂来改变。在这项研究中，对纳米石灰分散体进行了进一步优化，以用于马斯特里赫特石灰石（一种粗糙的多孔石灰石）上。首先，合成纳米石灰并将其分散在乙醇和/或水中，以纯净或以不同百分比混合。随后，基于纳米石灰分散体的动力学稳定性，选择了最有前途的溶剂混合物并将其应用于石灰石上。通过酚酞试验，光学显微镜和扫描电子显微镜研究了石灰石在石灰石中的沉积。结果证实，与在纯乙醇中的分散体相比，分散在乙醇（95％）和水（5％）的混合物中的纳米石灰可以确保更好的纳米颗粒在粗糙的多孔基质中的深度沉积。

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  • 来源
    《Applied Physics》 |2016年第9期|846.1-846.10|共10页
  • 作者

    Giovanni Borsoi; Barbara Lubelli; Rob van Hees; Rosario Veiga; Antonio Santos Silva;

  • 作者单位

    Heritage and Architecture Section, Faculty of Architecture, TU Delft, Julianalaan 134, 2628 BL Delft, The Netherlands;

    Heritage and Architecture Section, Faculty of Architecture, TU Delft, Julianalaan 134, 2628 BL Delft, The Netherlands,Division of Structural Reliability, TNO, Van Mourik Broekmanweg 6, 2628 XE Delft, The Netherlands;

    Heritage and Architecture Section, Faculty of Architecture, TU Delft, Julianalaan 134, 2628 BL Delft, The Netherlands,Division of Structural Reliability, TNO, Van Mourik Broekmanweg 6, 2628 XE Delft, The Netherlands;

    Building Division, LNEC, Av. do Brasil 101, 1700-066 Lisbon, Portugal;

    Materials Division, LNEC, Av. do Brasil 101, 1700-066 Lisbon, Portugal;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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