scholarly journals Biomimetic hygroscopic nanofibrous membrane with gradient honeycomb-like network structure for efficient atmospheric water harvesting

2021 ◽  
Author(s):  
Yufei Zhang ◽  
Lei Wu ◽  
Xinglei Zhao ◽  
Xianfeng Wang ◽  
Jianyong Yu ◽  
...  
Keyword(s):  
Network Structure ◽  
Spider Silk ◽  
Moisture Absorption ◽  
Absorption Capacity ◽  
Water Harvesting ◽  
Atmospheric Water ◽  
High Elasticity ◽  
Absorption Performance ◽  
Directional Transport

Abstract Honeycomb-like nanofibrous membranes (NFMs) are promising nanomaterials that can be used in tissue engineering, drug delivery, and water harvesting; however, enhancing the mechanical properties of these nanomaterials has proven extremely challenging. Herein, we report a biomimetic, super-flexible, highly elastic, and tough NFM-based water/fog harvester with a highly-ordered gradient honeycomb-like network structure self-assembled from electrospun spider-silk-like humped nanofibers. The resultant NFM exhibits super flexibility, strengthening (2.9 MPa), high elasticity, and toughening (3.39 MJ m− 3), allowing it to be used as the framework of hygroscopic materials. The resulting hygroscopic NFM displays excellent moisture absorption performance. It can be used as a water/fog harvester with superhigh equilibrium moisture absorption capacity of 4.60 g g− 1 at 95% RH, fast moisture absorption and transport rates, and long-term durability, achieving directional transport and collection of tiny water droplets. This work paves the way for the design and development of multifunctional NFMs with gradient honeycomb-like network structure.

Investigation of wettability and moisture sorption property of electrospun poly(N-isopropylacrylamide) nanofibers

MRS Advances ◽  
2016 ◽  
Vol 1 (27) ◽  
pp. 1959-1964 ◽  
Author(s):  
Anupama Sargur Ranganath ◽  
V. Anand Ganesh ◽  
Kostiantyn Sopiha ◽  
Rahul Sahay ◽  
Avinash Baji
Keyword(s):  
Biomedical Applications ◽  
Elevated Temperatures ◽  
Moisture Absorption ◽  
Sorption Property ◽  
Moisture Sorption ◽  
Absorption Capacity ◽  
Electrospun Fibers ◽  
Water Harvesting ◽  
Water Contact ◽  
Hygroscopic Properties

ABSTRACTPoly(N-isopropylacrylamide) (PNIPAM) has been used extensively for numerous biomedical applications. However, there is not enough information in the literature on the wettability and hygroscopic properties of electrospun PNIPAM fibers, relevant for water harvesting applications. This study focuses on investigating the wettability and hygroscopic properties of electrospun PNIPAM fibers at room temperature and elevated temperature. The wettability properties of electrospun PNIPAM fibers were compared to spin-coated PNIPAM thin films. The wettability properties of the electrospun fibers were enhanced by 56% compared to spin-coated films. Water contact angle (WCA) measured on electrospun fibers was determined to be 137° at elevated temperatures while WCA on spin cast PNIPAM film was determined to be 81° at elevated temperatures. Furthermore, hygroscopic properties of the electrospun PNIPAM fibers were studied using thermogravimetric analysis (TGA). The PNIPAM fibers are seen to exhibit moisture absorption capacity of about 16.6 wt. % under humid conditions.

scholarly journals Proposing a model for absorption capacity of technology

2015 ◽  
Vol 4 (1) ◽  
pp. 113 ◽  
Author(s):  
Hossein Gholizadeh ◽  
Ali Bonyadi Naeini ◽  
Alireza Moini
Keyword(s):  
Structural Equation Modeling ◽  
Structural Equation ◽  
Developed Countries ◽  
Absorption Capacity ◽  
Equation Modeling ◽  
Technological Gap ◽  
Expert Opinions ◽  
Modeling Analysis ◽  
Effective Dimensions

Absorption capacity of knowledge is the concept which is been introduced in this situation. This phenomenon describes why some countries are in a better condition with a view to technology. Many countries believe that the power to stay in the battle and excel other competitors directly depends on their abilities in taking knowledge. Many countries have used their technological gap with developed countries as an accelerator for improving their absorption capacity. In this study, authors tried to produce a complete definition for absorption capacity through analyzing different research. Then with using expert opinions, a categorization for dimensions of absorption capacity will be prepared by using the structural equation modeling analysis, and finally a model for measuring absorption capacity is suggested. The results show effective dimensions in 5 different section. Studies depict that the most important one is keeping which could be a fundamental for long-term policies of 1404.

scholarly journals Atmospheric Water Vapor Budget and its Long-term Trend over the Tibetan Plateau

2020 ◽  
Author(s):  
Hongru Yan ◽  
Jianping Huang ◽  
Yongli He ◽  
Yuzhi Liu ◽  
Tianhe Wang ◽  
...  
Keyword(s):  
Water Vapor ◽  
Tibetan Plateau ◽  
Atmospheric Water Vapor ◽  
The Tibetan Plateau ◽  
Atmospheric Water ◽  
Term Trend ◽  
Long Term Trend ◽  
Water Vapor Budget

INTERFACES BETWEEN ATMOSPHERIC WATER HARVESTING AND SOLAR ENERGY: EVIDENCES FROM A BIBLIOMETRIC STUDY

2021 ◽  
Author(s):  
Ana Carolina Lamas da Silva ◽  
Elias Rocha Gonçalves Junior ◽  
Virgínia Siqueira Gonçalves
Keyword(s):  
Solar Energy ◽  
Bibliometric Study ◽  
Water Harvesting ◽  
Atmospheric Water

METHOD OF PROCESSING COLLAGEN FRESHWATER FISH TO OBTAIN A MATERIAL WITH A HIGH MOISTURE ABSORBING ABILITY

2019 ◽  
Author(s):  
Л.В. АНТИПОВА ◽  
С.А. ТИТОВ ◽  
И.В. СУХОВ
Keyword(s):  
Freshwater Fish ◽  
Moisture Absorption ◽  
Raw Materials ◽  
Silver Carp ◽  
Absorption Capacity ◽  
Personal Hygiene ◽  
Test Material ◽  
Free Access ◽  
High Moisture ◽  
Scanning Calorimetry

Исследовано взаимодействие коллагена пресноводных рыб с водой для повышения его водопоглощающей способности. Объектом исследования был вторичный продукт переработки рыбного сырья – шкуры прудовых рыб, преимущественно толстолобика. Для исследования были использованы методы термогравиметрии и дифференциальной сканирующей калориметрии. Измерения проведены на приборе синхронного термического анализа модели STA 449 F3 Jupiter. Установлено, что основная доля влаги связывается адсорбционным или осмотическим путем, а на долю капиллярной влаги приходится всего 7% массы воды, связанной образцами. Большая величина энергии связи адсорбции – 4 Дж/моль свидетельствует о способности функциональных групп коллагена к созданию гидратной оболочки, содержащей значительное количество воды. Для увеличения влагопоглощающей способности необходимо разрыхление коллагеновых волокон, что увеличивается свободный доступ влаги к фибриллам белка, увеличивающим впитывание влаги. Для эффективного разрыхления предложено выдерживать шкуры толстолобика в растворе органических кислот концентрацией 0,5%. Это позволяет добиться высокой влагоемкости, которая достигает 35–40 объемов влаги на 1 единицу массы исследуемого материала, что делает перспективным использование коллагена в качестве материала для впитывающих влагу слоев средств личной гигиены, одежды, обуви. The interaction of freshwater fish collagen with water to increase its water absorption capacity was studied. The secondary product of processing of fish raw materials – skins of pond fish, mainly silver carp, was the object of study. Methods of thermogravimetry and differential scanning calorimetry were used for the study. Measurements were carried out on the device of synchronous thermal analysis of model STA 449 F3 Jupiter. It was found that the bulk of the moisture is bound by adsorption or osmotic way, and 7% of mass of the water connected by samples fall to the share of capillary moisture. A large amount of adsorption binding energy – 4 J/mol indicates the ability of collagen functional groups to create a hydrated shell containing a significant amount of water. Loosening of collagen fibers is necessary to increase the moisture absorption capacity, which will increase the free access of moisture to the protein fibrils, increasing the absorption of moisture. It is proposed to withstand the skins of silver carp in a solution of organic acids with a concentration of 0,5% for effective loosening. This makes it possible to achieve high moisture capacity, which reaches 35–40 volumes of moisture per 1 unit mass of the test material, which makes it promising to use collagen as a material for moisture-absorbing layers of personal hygiene products, clothing, and shoes.

scholarly journals Exploiting radiative cooling for uninterrupted 24-hour water harvesting from the atmosphere

2021 ◽  
Vol 7 (26) ◽  
pp. eabf3978
Author(s):  
Iwan Haechler ◽  
Hyunchul Park ◽  
Gabriel Schnoering ◽  
Tobias Gulich ◽  
Mathieu Rohner ◽  
...  
Keyword(s):  
Radiative Heat ◽  
Outer Space ◽  
Continuous Production ◽  
Solar Irradiation ◽  
Cooling Power ◽  
Water Harvesting ◽  
Atmospheric Water ◽  
Promising Alternative ◽  
Mass Fluxes ◽  
Power Enhancement

Atmospheric water vapor is ubiquitous and represents a promising alternative to address global clean water scarcity. Sustainably harvesting this resource requires energy neutrality, continuous production, and facility of use. However, fully passive and uninterrupted 24-hour atmospheric water harvesting remains a challenge. Here, we demonstrate a rationally designed system that synergistically combines radiative shielding and cooling—dissipating the latent heat of condensation radiatively to outer space—with a fully passive superhydrophobic condensate harvester, working with a coalescence-induced water removal mechanism. A rationally designed shield, accounting for the atmospheric radiative heat, facilitates daytime atmospheric water harvesting under solar irradiation at realistic levels of relative humidity. The remarkable cooling power enhancement enables dew mass fluxes up to 50 g m−2 hour−1, close to the ultimate capabilities of such systems. Our results demonstrate that the yield of related technologies can be at least doubled, while cooling and collection remain passive, thereby substantially advancing the state of the art.

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