Institut National de la Recherche Agronomique (INRA), UR 1268, Rue de la Géraudière, 44300 Nantes, France; Institut des Matériaux Jean Rouxel (IMN), UMR 6502, 2 Rue de la Houssinière BP32229, 44322 Nantes, France.
Institut des Matériaux Jean Rouxel (IMN), UMR 6502, 2 Rue de la Houssinière BP32229, 44322 Nantes, France.
J Colloid Interface Sci. 2019 May 15;544:78-87. doi: 10.1016/j.jcis.2019.01.127. Epub 2019 Feb 13.
The association of nanoparticles with complementary properties to produce hybrids is an underestimated way to develop multifunctional original architectures. This strategy is used to prepare simple, low-cost, and environmentally friendly method to fabricate ultra-low density alveolar foam reinforced with carbon nanotubes (CNTs). This paper investigates the ability of cellulose nanocrystals (CNCs) to produce highly stable oil-in-water Pickering emulsions and to efficiently disperse carbon nanotubes in water to form three-dimensional macroporous conductive foam. It is shown that both single-walled carbon nanotubes (SWNTs) and multi-walled carbon nanotubes (MWNTs) are strongly linked to CNCs by non-covalent interactions, preserving the intrinsic properties of both nanoparticles. Homogeneous surfactant-free emulsions with a droplet diameter of 6 µm are produced. Once concentrated, they can form stable high internal phase emulsions. Incorporating CNTs into these CNC-based emulsions was shown to improve their rheological properties. Freeze-drying the concentrated emulsions produces ultra-low density solid foams (14 mg·cm) with several levels of porosity controlled by the emulsification step. Loading CNCs with only 2-4 wt% of CNTs, decreases the electrical resistivity of the foam to 10 Ω cm in high relative humidity. The mechanical and electrical properties are studied and discussed in light of the resulting specific foam structure.
将具有互补特性的纳米粒子与互补性质的纳米粒子结合起来，产生杂种，这是开发多功能原始结构的一种被低估的方法。该策略用于制备简单，低成本且环保的方法，以制造由碳纳米管（CNT）增强的超低密度肺泡泡沫。本文研究了纤维素纳米晶体（CNC）制备高度稳定的油包水 Pickering 乳液的能力，并有效地将碳纳米管分散在水中以形成三维大孔导电泡沫。结果表明，单壁碳纳米管（SWNT）和多壁碳纳米管（MWNT）均通过非共价相互作用与 CNC 紧密结合，从而保留了两种纳米粒子的固有特性。可形成具有 6μm 粒径的均匀单分散无表面活性剂乳液。一旦浓缩，它们就可以形成稳定的高内相乳液。将 CNT 掺入基于这些 CNC 的乳液中，可改善其流变性能。将浓缩乳液冷冻干燥会产生超低密度的固体泡沫（14mg·cm），其多孔性可通过乳化步骤进行控制。在高相对湿度下，仅负载 2-4wt％的 CNC 就可以将泡沫的电阻率降低至 10Ωcm。研究并讨论了机械和电气性能，以阐明所得的特定泡沫结构。
