Departamento de Edafoloxía e Química Agrícola, Facultade de Farmacia, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain.
Escola Superior de Conservación e Restauración de Bens Culturais de Galicia, 36002 Pontevedra, Spain.
Mater Sci Eng C Mater Biol Appl. 2021 May;124:112058. doi: 10.1016/j.msec.2021.112058. Epub 2021 Mar 25.
The recently proposed concept of quaternary bioreceptivity applies to substrates treated with coating materials and it is considered in the present study with the alga Bracteacoccus minor and the cyanobacterium Nostoc sp. onto granite specimens treated with ethyl silicate and nano-sized silica doped with different amounts of TiO (0, 0.5, 1 and 3 wt%). The findings showed a lack of correlation between the amount of TiO and the level of colonization (main bioreceptivity estimator) to the presence of cracks on the surface, which annul the biocidal power of TiO. Crack formation, which depends on the mechanical properties, greatly influences the bioreceptivity of the material. Thus, the cracks provided anchor points where water is retained, in turn strongly influencing the early stages of colonization kinetics, to a greater extent than the biocidal power of TiO, which will probably increase as the biofilm develops over the entire surface. In addition, although the cracks were more abundant and wider in the ethyl silicate-based consolidant, the nano-sized silica provided better anchoring points, making the material treated with the corresponding consolidant more bioreceptive.
最近提出的四元生物感受性概念适用于经过涂层材料处理的基底，本研究考虑了将藻类 Bracteacoccus minor 和蓝细菌 Nostoc sp. 接种到经过硅酸乙酯和纳米二氧化硅处理的花岗岩标本上，纳米二氧化硅掺杂了不同量的 TiO（0、0.5、1 和 3 wt%）。研究结果表明，TiO 的含量与表面裂缝的存在之间缺乏相关性，而裂缝会消除 TiO 的杀菌能力。裂缝的形成取决于机械性能，极大地影响了材料的生物感受性。因此，裂缝提供了水分保留的锚固点，反过来强烈影响了定殖动力学的早期阶段，其影响程度大于 TiO 的杀菌能力，随着生物膜在整个表面上的发展，TiO 的杀菌能力可能会增加。此外，尽管在基于硅酸乙酯的固结剂中裂缝更丰富且更宽，但纳米二氧化硅提供了更好的锚固点，使得用相应固结剂处理的材料具有更高的生物感受性。
