High-efficiency water collection on biomimetic material with superwettable patterns

2016 ◽  
Vol 52 (84) ◽  
pp. 12415-12417 ◽  
Author(s):  
Hai Zhu ◽  
Fuchao Yang ◽  
Jing Li ◽  
Zhiguang Guo
Keyword(s):  
High Efficiency ◽  
Collection Rate ◽  
Biomimetic Material ◽  
Collection Process ◽  
Water Collection ◽  
Harvesting Efficiency ◽  
Superhydrophilic Surface

A superhydrophilic surface with two superhydrophobic circular patterns was successfully prepared, which showed outstanding fog-harvesting efficiency with a water collection rate (WCR) of 1316.9 mg h−1 cm−2. The water collection process can be repeated 10 times without obvious variation in the WCR.

scholarly journals Hydrophilic nanofibers in fog collectors for increased water harvesting efficiency

RSC Advances ◽  
2020 ◽  
Vol 10 (38) ◽  
pp. 22335-22342
Author(s):  
Joanna Knapczyk-Korczak ◽  
Piotr K. Szewczyk ◽  
Daniel P. Ura ◽  
Katarzyna Berent ◽  
Urszula Stachewicz
Keyword(s):  
Water Harvesting ◽  
Fog Water ◽  
Collection Rate ◽  
Water Collection ◽  
Harvesting Efficiency

Modification of Raschel meshes used for fog water collectors with PA6 nanofibers allow to obtain 300% higher water collection rate in collecting water from fog.

Optical Nano-Antennas for Energy Harvesting

2015 ◽  
pp. 26-62 ◽  
Author(s):  
Salah Obayya ◽  
Nihal Fayez Fahmy Areed ◽  
Mohamed Farhat O. Hameed ◽  
Mohamed Hussein Abdelrazik
Keyword(s):  
Solar Cells ◽  
Energy Harvesting ◽  
Solar Energy ◽  
Photonic Crystals ◽  
High Efficiency ◽  
Low Cost ◽  
Harvesting Efficiency ◽  
And Performance ◽  
Nano Wires ◽  
Nano Antennas

The solar energy is able to supply humanity energy for almost another 1 billion years. Optical nano-antennas (ONAs) are an attractive technology for high efficiency, and low-cost solar cells. These devices can be classified to semiconductor nano-wires and metallic nano-antenna. Extensive studies have been carried out on ONAs to investigate their ability to harvest solar energy. Inspired by these studies, the scope of the chapter is to highlight the latest designs of the two main types of ONAs. The metallic nano-antennas are discussed based on the following points: plasmon, modeling, and performance of antenna designs using different configurations and materials. Moreover, the semiconductor nano-wires are studied thoroughly in terms of photonic crystals, antenna design with different patterns, nano-wire forms and materials. Also, the applications of ONAs and their fabrication aspects such as diode challenges are presented in detail. Finally, three novel designs of ONAs are presented and numerically simulated to maximize the harvesting efficiency.

scholarly journals Designing bioinspired surfaces for water collection from fog

2018 ◽  
Vol 377 (2138) ◽  
pp. 20180269 ◽  
Author(s):  
Dev Gurera ◽  
Bharat Bhushan
Keyword(s):  
Flat Surface ◽  
Unit Area ◽  
Water Repellency ◽  
Vertical Axis ◽  
Collection Rate ◽  
Flat Surfaces ◽  
Single Cone ◽  
Water Collection ◽  
The Difference ◽  
Conical Surfaces

A systematic study is presented on various water collectors, bioinspired by desert beetles, desert grass and cacti. Three water collecting mechanisms including heterogeneous wettability, grooved surfaces, and Laplace pressure gradient, were investigated on flat, cylindrical, conical surfaces, and conical array. It is found that higher water repellency in flat surfaces results in higher water collection rate and inclination angle (with respect to the vertical axis) has little effect. Surfaces with heterogeneous wettability have higher water collection rate than surfaces with homogeneous wettability. Both cylindrical and conical surfaces resulted in comparable water collection rate. However, only the cone transported the water droplets to its base. Heterogeneity, higher inclination and grooves increased the water collection rate. A cone has a higher collection rate per unit area than a flat surface with the same wettability. An array of cones has higher collection rate per unit area than a single cone, because droplets in a conical array coalesce, leading to higher frequency of droplets falling. Adding heterogeneity further increases the difference. Based on the findings, scaled-up designs of beetle-, grass- and cactus-inspired surfaces and nets are presented. This article is part of the theme issue ‘Bioinspired materials and surfaces for green science and technology’.

Dual-scale micro/nanostructures for high-efficiency water collection

2017 ◽  
Vol 92 ◽  
pp. 19-22 ◽  
Author(s):  
Zhi Huang ◽  
Xiantao Zhang ◽  
Xuejiao Hu
Keyword(s):  
High Efficiency ◽  
Water Collection ◽  
Dual Scale

Combinational biomimetic microfibers for high-efficiency water collection

2022 ◽  
pp. 134495
Author(s):  
Ming Zhang ◽  
Zhiyuan Zheng ◽  
Yuanqing Zhu ◽  
Zhiqiang Zhu ◽  
Ting Si ◽  
...  
Keyword(s):  
High Efficiency ◽  
Water Collection

Inspired by Stenocara Beetles: From Water Collection to High-Efficiency Water-in-Oil Emulsion Separation

ACS Nano ◽  
2016 ◽  
Vol 11 (1) ◽  
pp. 760-769 ◽  
Author(s):  
Xinjuan Zeng ◽  
Long Qian ◽  
Xianxia Yuan ◽  
Cailong Zhou ◽  
Zhaowen Li ◽  
...  
Keyword(s):  
High Efficiency ◽  
Oil Emulsion ◽  
Water Collection ◽  
Emulsion Separation ◽  
Water In Oil Emulsion

A fog-collecting surface mimicking the Namib beetle: its water collection efficiency and influencing factors

Nanoscale ◽  
2020 ◽  
Vol 12 (13) ◽  
pp. 6921-6936 ◽  
Author(s):  
Jun Lei ◽  
Zhiguang Guo
Keyword(s):  
Surface Structure ◽  
Influencing Factors ◽  
Collection Efficiency ◽  
Surface Wettability ◽  
Namib Desert ◽  
Surface Distribution ◽  
Collection Rate ◽  
Water Collection

In the Namib Desert, beetles can obtain water by fog-basking. In this review, we discussed the water collection rate of surfaces inspired by beetles from three aspects: surface wettability, surface structure and surface distribution.

Carotenoid-chlorophyll complexes: Ready-to-harvest

2005 ◽  
Vol 77 (6) ◽  
pp. 925-945 ◽  
Author(s):  
Harsha M. Vaswani ◽  
Nancy E. Holt ◽  
Graham R. Fleming
Keyword(s):  
Density Functional ◽  
High Efficiency ◽  
Light Harvesting ◽  
Photosynthetic Apparatus ◽  
Functional Theory ◽  
Naturally Occurring ◽  
Harvesting Systems ◽  
Harvesting Efficiency ◽  
Pigment Protein Complex

The fundamental interactions between naturally occurring pigments in light-harvesting systems are responsible for the high efficiency of the photosynthetic apparatus. We describe the role of carotenoids (Cars) in light-harvesting systems, including our work elucidating the mechanism of energy transfer from the optically dark Car singlet excited state (S1) to chlorophyll (Chl) and calculations on the electronic structure of Cars by means of time-dependent density functional theory (TDDFT). We highlight new studies on the charge-transfer state of the Car, peridinin (Per), which enhances the light-harvesting efficiency of the Car by increasing the electronic coupling to Chl. The role of another Car, zeaxanthin (Zea), is discussed with respect to its role in the mechanism of the feedback deexcitation quenching in green plants, a vital regulation process under light conditions which exceed photosynthetic capacity. Lastly, we provide insight on how the 96 Chls in Photosystem I are optimized to generate a pigment-protein complex which utilizes solar energy with near unit efficiency.

scholarly journals A Novel Design of Hybrid Hydrophilic-Superhydrophobic Surfaces for Fog Harvesting

2021 ◽  
Vol 6 (3) ◽  
pp. 152-162
Author(s):  
Zaid Almusaied ◽  
Bahram Asiabanpour
Keyword(s):  
Water Scarcity ◽  
Large Scale ◽  
Spray Coating ◽  
Superhydrophobic Surfaces ◽  
Atmospheric Water ◽  
Continuous Growth ◽  
Collection Rate ◽  
Hydrophobic Coating ◽  
Fog Collection ◽  
Water Collection

The continuous growth in the human population and climate change exacerbates the problems related to water scarcity. Harvesting the atmospheric water can mitigate the water scarcity in many regions around the globe. Fog collection using hybrid hydrophilic-superhydrophobic surfaces has the capacity to achieve a higher water collection rate. In this paper, a new method and materials are introduced to create the hybrid surfaces. The method includes additive manufacturing- to make sheets with holes-, mixing and casting polymeric matrix composite, and a controlled spray coating mechanism. The materials comprised of hydrophobic coating on top of the acrylic printed sheet and hydrophilic composite. The ratios of the pitches to diameters of the hydrophilic regions varied during the experiments to obtain the best water generation. The water collection rate for the sample with diameters of 583 um and a pitch of 1600 um has achieved 57% more than the untreated hydrophilic sample. The contrast in wettability accomplished by this novel method has the potential to be implemented on a large scale for atmospheric water harvesting.

scholarly journals Harvesting Vibration Energy and Wind Energy by a Bi-stable Harvester: Modeling and Experiments

2021 ◽  
Author(s):  
Haitao Li ◽  
Bojian Dong ◽  
Fan Cao ◽  
Weiyang Qin ◽  
Hu Ding ◽  
...  
Keyword(s):  
Wind Energy ◽  
Energy Harvester ◽  
High Efficiency ◽  
Random Excitation ◽  
Vibration Energy ◽  
Total Output ◽  
Nonlinear Dynamical ◽  
Modeling And Experiments ◽  
Harvesting Efficiency ◽  
Bistable Energy Harvester

Abstract In realistic environments, there often appears the concurrence of base excitation and blowing wind. Harvesting both vibration energy and wind energy by an unique harvester is attractive. In this paper, we proposed a harvester integrating bi-stability and galloping to realize this aim. The nonlinear dynamical model of the bistable energy harvester under concurrent wind and base excitations is established. The galloping effects on the responses are explored based on the established model, for both harmonic and random excitations. The corresponding experiments are conducted to validate the theoretical prediction. The experimental results are consistent with the simulation results. At a wind speed of U=2 m/s, the bandwidth of large-amplitude inter-well motion of the bi-stable energy harvester is extended by about 18.5%. The critical random excitation level for snap-through is reduced by 58% and the total output voltage at random excitation is increased by 53.4%. Thus, the harvester could scavenge the wind and vibration energies at a high efficiency. These conclusions could be helpful for improving the harvesting efficiency in the real environment.

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