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Efficient 3D-interfacial solar steam generation enabled by photothermal nanodiamonds paint-coat with optimized heat management
摘要： Photothermal materials are crucial for maximizing the solar energy in solar steam generation. The conventional photothermal materials have limited absorption broadband, complicated manufacture, expensive cost and difficulty in scaling up. To remedy this dilemma, we herein propose a novel cost-effective nanodiamonds(NDs) paint-coat using filter papers (FPs) as a supporting scaffold. The phy-chemical characterizations of samples like morphology, structure and optical properties indicate that the NDs paint-coat has bandwidth absorption, porous network structure, and high absorption ability. For the sake of evaluating their practical applications, NDs paint-coat and 3D conical structures were further designed to constitute a 3D-interfacial solar steam generation (3D-ISSG). Owing to the rationally 3D structure, the heat loss and optical loss have been effectively restrained through optimized heat management within the 3D-ISSG. The experimental results show that the solar thermal conversion efficiency of 3D-ISSG was achieved up to 82.97 % for evaporation under one sun illumination (1 kW/m2), which is about 4.16 times as high as the pure water. Moreover, the 3D-ISSG performs reliable reusability after 15 cycling experiments under 1 kW/m2 solar illumination, indicating its broad application prospect for new energy devices, seawater desalination and water treatment.
关键词： three-dimensional structure,photothermal conversion,interfacial heating,optimized heat management,Nanodiamonds
更新于2025-09-19 17:13:59
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Abrupt Change in Forest Height along a Tropical Elevation Gradient Detected Using Airborne Lidar
摘要： Most research on vegetation in mountain ranges focuses on elevation gradients as climate gradients, but elevation gradients are also the result of geological processes that build and deconstruct mountains. Recent ?ndings from the Luquillo Mountains, Puerto Rico, have raised questions about whether erosion rates that vary due to past tectonic events and are spatially patterned in relation to elevation may drive vegetation patterns along elevation gradients. Here we use airborne light detection and ranging (LiDAR) technology to observe forest height over the Luquillo Mountain Range. We show that models with different functional forms for the two prominent bedrock types best describe the forest height-elevation patterns. On one bedrock type there are abrupt decreases in forest height with elevation approximated by a sigmoidal function, with the in?ection point near the elevation of where other studies have shown there to be a sharp change in erosion rates triggered by a tectonic uplift event that began approximately 4.2 My ago. Our ?ndings are consistent with broad geologically mediated vegetation patterns along the elevation gradient, consistent with a role for mountain building and deconstructing processes.
关键词： long-term ecological research,geology,critical zone observatory,three-dimensional structure,vegetation,10Be,erosion,active remote sensing,tectonics,ecology
更新于2025-09-09 09:28:46