Bioinspired Multifunctional Superhydrophobic Surfaces with Carbon-Nanotube-Based Conducting Pastes by Facile and Scalable Printing

Abstract

Directly printed superhydrophobic surfaces containing conducting nanomaterials can be used for a wide range of applications in terms of nonwetting, anisotropic wetting, and electrical conductivity. Here, we demonstrated that direct-printable and flexible superhydrophobic surfaces were fabricated on flexible substrates via with an ultrafacile and scalable screen printing with carbon nanotube (CNT)-based conducting pastes. A polydimethylsiloxane (PDMS)-polyethylene glycol (PEG) copolymer was used as an additive for conducting pastes to realize the printability of the conducting paste as well as the hydrophobicity of the printed surface. The screen-printed conducting surfaces showed a high water contact angle (WCA) (>150°) and low contact angle hysteresis (WCA < 5°) at 25 wt % PDMS-PEG copolymer in the paste, and they have an electrical conductivity of over 1000 S m. Patterned superhydrophobic surfaces also showed sticky superhydrophobic characteristics and were used to transport water droplets. Moreover, fabricated films on metal meshes were used for an oil/water separation filter, and liquid evaporation behavior was investigated on the superhydrophobic and conductive thin-film heaters by applying direct current voltage to the film.

Ultrafast, Reversible Transition of Superwettability of Graphene Network and Controllable Underwater Oil Adhesion for Oil Microdroplet Transportation

“…When the input voltage is 20 V, the OCGNs shows a heating rate of 20 °C s −1 (Figure a; Movie S2, Supporting Information). Besides, when the voltage was turned off, it cooled to the ambient temperature within 12 s. Compared with the reported Joule heating film based on carbon materials, which need ≈60 or 200 s to reach the stabilized temperature, our OCGNs have a faster heating rate at the same voltage. This ultrafast Joule heating of OCGNs is mainly attributed to the good conductivity of the pure graphene network .…”

Development of Self-Healable Organic/Inorganic Hybrid Materials Containing a Biobased Copolymer via Diels–Alder Chemistry and Their Application in Electromagnetic Interference Shielding

“…In order to further diverse the functionality and broaden the application field of the DA type systems, several important properties could be further introduced. For example, conductivity is greatly required for electronic applications such as microelectronics packaging [33], medical devices [34], artificial skins [35], and electromagnetic interference (EMI) shielding [36]. So far, several research studies have been performed to develop DA based nanocomposites, wherein conductive fillers such as metallic nanoparticles [37], carbon nanotubes [38,39,40], and graphene [41,42,43] were incorporated into the material systems.…”

Ultrafast Electro-Thermal Responsive Heating Film Fabricated from Graphene Modified Conductive Materials

“…These limitations impede the applications of conventional electrothermal materials but remain lots of opportunities to develop new materials. Nowadays carbon based conductive ink (CCI), which is mainly composed with carbon nanomaterials, has employed for flexible heating film for the [16][17][18][19][20] low cost, robustness, easy fabrication, long-term stability and safety. However, most of these carbon based inks are less thermal and electrical conductive comparing to metal based materials, thereby the electro-thermal conversion efficiency and heating performance are not as good as metal materials.…”