Putting interfaces at work

让接口发挥作用

• 批准号: RGPIN-2020-06326
• 负责人: Fradette, Louis
• 金额: $ 2.4万
• 依托单位: École Polytechnique de Montréal
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2021
• 资助国家: 加拿大
• 起止时间: 2021-01-01 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=740748
• 关键词: Putting; interfaces; work

Full recycling of all the materials, waste waters, and gaseous emissions is an irreversible trend. New processing technologies are required to succeed. The existing processing techniques have reached their limit or simply the processes required do not exist yet. New, high-performance materials will be at the core of the transformation, allowing for extra light structures to be produced, making use of much less materials than what is currently used to provide similar and even superior properties. The proposed program aims at using interfaces (Liquid-Liquid and Gas-liquid) in combination with their affinity with particles having specific surface properties to develop high-selectivity recycling technologies or build high-performance materials with extreme porosity that will minimize the quantify of resources required. The applicant is an expert in the processing of solid-stabilized emulsions (AKA SSEs or Pickering emulsions) and foams. SSE are produced when fine particles (micron- to nano-sized) attach at an interface. The surface chemistry of the particles, combined to the water and the oil chemistry, is crucial for the final result to be a SSE. When conventionally preparing SSEs, it is possible to select all the chemical conditions of each constituent (water, oil and particles) so that an emulsion is produced. So far, SSEs have been produced to be used as is in the cosmetic, pharmaceutical, chemical, and oil refining industries. Two main types of emulsions can be prepared i.e. low and high concentrations where the frontier between the two sits at the maximum packing fraction of identical spheres, around 65% of dispersed phase. Below this value, we name the emulsions SSEs while above, we use HIPE-SSEs for High Internal Phase Emulsions SSEs. The same can be said of foams were gas a liquid are used instead of two liquids. The two main ideas that triggered this program is first that low dispersed content SSEs could be used to harvest particles of interest in separation processes and second that HIPE SSEs could provide templates to build highly porous materials. In both cases, the approach is to investigate the processing required for the potential applications and eventually determine the real potential for such applications at large scale. When the oil content is kept below 40% in volume, SSEs offer the potential to selectively separate ground/crushed materials (raw ore, recycled plastics or biomaterials, glass, .) by controlling the chemistry of the oil and the water phases to make them attractive to the particles targeted. At high oil volume content (HIPE-SSE), the drops are in contact with their neighbours and the interface between the drops offers a continuous structure of particles. Subsequent processing of these emulsions may transform the particles structure into a solid material, after removal of the oil and the water phases with the resulting solid being highly porous.

所有材料、沃茨和气体排放物的完全回收利用是不可逆转的趋势。需要新的加工技术才能取得成功。现有的处理技术已经达到了极限，或者只是所需的过程还不存在。新的高性能材料将成为转型的核心，允许生产额外的轻质结构，使用比目前使用的材料少得多的材料来提供类似甚至上级的性能。 该计划旨在使用界面（液-液和气-液）结合其与具有特定表面特性的颗粒的亲和力，以开发高选择性回收技术或构建具有极高孔隙率的高性能材料，从而最大限度地减少所需资源的数量。申请人是固体稳定乳液（AKA SSE或Pickering乳液）和泡沫加工方面的专家。当细颗粒（微米至纳米级）附着在界面时就会产生SSE。颗粒的表面化学与水和油的化学相结合，对于最终结果是SSE至关重要。当常规地制备SSE时，可以选择每种成分（水、油和颗粒）的所有化学条件，使得产生乳液。到目前为止，SSE已经被生产用于化妆品，制药，化学和炼油工业。可以制备两种主要类型的乳液，即低浓度和高浓度，其中两者之间的边界位于相同球体的最大填充分数处，约为分散相的65%。低于此值时，我们将乳液命名为SSE，而高于此值时，我们将HIPE-SSE用于高内相乳液SSE。泡沫也是如此，使用气体和液体代替两种液体。触发该计划的两个主要想法是，首先，低分散含量的SSE可用于在分离过程中收获感兴趣的颗粒，其次，HIPE SSE可提供模板来构建高度多孔的材料。在这两种情况下，方法是调查潜在应用所需的处理，并最终确定大规模应用的真实的潜力。 当含油量保持在40%以下时，SSE提供了选择性分离研磨/破碎材料（原矿石，回收塑料或生物材料，玻璃）的潜力。通过控制油相和水相的化学性质以使它们吸引目标颗粒。在高油体积含量（HIPE-SSE）下，液滴与其相邻的液滴接触，并且液滴之间的界面提供连续的颗粒结构。在除去油相和水相之后，这些乳液的后续加工可以将颗粒结构转化为固体材料，得到的固体是高度多孔的。