Bio-Inspired Hollow Carbon Microtubes for Multifunctional Photothermal Protective Coatings

Abstract

Solar energy-facilitated materials are promising to solve energy problems by converting clean solar energy to thermal energy. However, heat loss of photothermal materials still limits the photothermal conversion phenomenon. Herein, we designed bio-inspired hollow carbon microtubes (HCMTs) by one-step carbonization of renewable cotton fibers, which can avoid the complex preparation procedures of the template method. Similar to polar bears, the hollow construction can efficiently reduce heat loss, which improves the utilization of light and photothermal property. The HCMTs can be applied on a variety of substrates to obtain multifunctional photothermal protective coatings. The temperature of the coating can rapidly warm up to 97.7 °C under 1 kW/m 2 sun irradiation. In addition, the coatings show excellent superhydrophobic property (CA of 161.5 ± 0.9°), which can prevent the adhesion of the contaminant and maintain the long-time photothermal property of the surface. Also, the coating is able to withstand sandpaper abrasion, repeat tape-peeling, and tribological friction without losing superhydrophobic properties, indicating remarkable mechanical stability. Furthermore, the coating can withstand high-temperature calcination (400 °C), long-time UV radiation, and corrosive liquid erosion, which exhibits prominent chemical stability. More importantly, the combination of active deicing and passive antiicing of the coating can effectively prevent the formation and accumulation of ice on the surface. The outstanding environmental adaptability can greatly extend its lifespan and meet the long-term service conditions.

Solar-Light-Responsive Zinc–Air Battery with Self-Regulated Charge–Discharge Performance based on Photothermal Effect

“…Benefiting from cavity configuration advantages, hollow carbon sphere can efficiently store the heat generated in the process of photothermal conversion, reduce the heat loss of heat exchange with the environment during the heating process of the material, and thus improve the utilization rate of light. 57 Moreover, the simulated absorption performance of hollow carbon sphere greatly conforms with the absorption region of FeNi-S,N-HCS obtained in the experiment, indirectly testifying that the visible light absorption of FeNi-S,N-HCS is mainly attributed to hollow carbon sphere, rather than FeNi nanoparticle. Compared with a solid carbon sphere, the absorption peak of the hollow carbon sphere demonstrates an obvious blue shift, indicating that the visible light response performance of FeNi-S,N-HCS is endowed by the geometrical configuration of the hollow carbon sphere (Figure 5f).…”

“…In contrast, a hollow carbon sphere exhibits both electric fields in and out of the spherical wall, which ensures the sufficient heating sites (Figures5d and e). Benefiting from cavity configuration advantages, hollow carbon sphere can efficiently store the heat generated in the process of photothermal conversion, reduce the heat loss of heat exchange with the environment during the heating process of the material, and thus improve the utilization rate of light 57. Moreover, the simulated absorption performance of hollow carbon sphere greatly conforms with the absorption region of FeNi-S,N-HCS obtained in the experiment, indirectly testifying that the visible light absorption of FeNi-S,N-HCS is mainly attributed to hollow carbon sphere, rather than FeNi nanoparticle.…”

Multiresonant TADF materials: triggering the reverse intersystem crossing to alleviate the efficiency roll-off in OLEDs

“…On the other hand, Wang et al developed two new emitters based on carbazole and Se-embedded skeletons, namely, Cz-BSeN and DCz-BSeN , respectively. 112 Since in DCz-BSeN another carbazole unit was present at the boron para position, a hypsochromic shifted emission (7 nm blue shift) was obtained without broadening of the spectrum. Notably, both materials showed sky blue emission with narrow FWHM below 30 nm.…”

Carbonyl (CO)/N-based thermally activated delayed fluorescent materials with high efficiency and fast reverse intersystem crossing rate: a theoretical design and study

“…The carbonyl (CO)/N-based (quinolino[3,2,1- de ]acridine-5,9-dione, QAD) MR structure has been attached to different moieties to realize TADF with large transition dipole moments (TDMs) and oscillator strengths. 34,46,49…”

“…The carbonyl (CQO)/N-based (quinolino[3,2,1-de]acridine-5,9-dione, QAD) MR structure has been attached to different moieties to realize TADF with large transition dipole moments (TDMs) and oscillator strengths. 34,46,49 Many theoretical efforts have been devoted to investigating the luminescence mechanisms and designing new TADF materials with superior performance. The geometrical and electronic structures of TADF materials can be evaluated by using the first principles methods, 8,[50][51][52][53][54][55] while the corresponding photophysical performance can be predicted based on the excited state properties.…”