Effects of thermal efficiency in DCMD and the preparation of membranes with low thermal conductivity

Li, Zhehao; Peng, Yongbo; Dong, Yajun; Fan, Hongwei; Chen, Ping; Qiu, Lin; Qi, Jing

doi:10.1016/j.apsusc.2014.07.080

Cited by 39 publications

(11 citation statements)

References 39 publications

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“…Past efforts to improve MD performance have focused almost entirely on varying pore diameter, tortuosity, and thickness. 4−16 There are very few experimental 17,18 or theoretical studies reporting MD performance of membrane materials with low thermal conductivity or high porosity (>90%).…”

Section: ■ Introduction and Backgroundmentioning

confidence: 99%

“…Large pore diameter, low pore tortuosity, high porosity, low thermal conductivity, and optimized thickness of MD membrane materials are correlated with high vapor permeability and thermal efficiency, regardless of MD process conditions. , Optimized thickness refers to the balance between minimizing mass transfer resistance to flow of vapor while maximizing the thermal gradient. Past efforts to improve MD performance have focused almost entirely on varying pore diameter, tortuosity, and thickness. − There are very few experimental , or theoretical studies reporting MD performance of membrane materials with low thermal conductivity or high porosity (>90%).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Bacterial Nanocellulose Aerogel Membranes: Novel High-Porosity Materials for Membrane Distillation

Leitch

Ikkala

et al. 2016

Environ. Sci. Technol. Lett.

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We fabricated, characterized, and tested novel fibrous aerogel membranes in direct contact membrane distillation (MD) to elucidate the effects of a model high-porosity membrane material on MD performance. Unsupported bacterial nanocellulose aerogels exhibit higher porosity, thinner fibers, and lower bulk thermal conductivity than any previously reported MD materials. Modeling and experiments demonstrate that these material properties confer significantly higher intrinsic membrane permeability and thermal efficiency than symmetric PVDF phase inversion membranes with lower porosity. Development of macroporous fibrous membranes with aerogel-like porosity and thermal conductivity (>98% and <0.03 W m–1 K–1, respectively) in thinner-film formats may further improve MD flux.

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Section: ■ Introduction and Backgroundmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bacterial Nanocellulose Aerogel Membranes: Novel High-Porosity Materials for Membrane Distillation

Leitch

Ikkala

et al. 2016

Environ. Sci. Technol. Lett.

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“…In recent years, mesoporous materials with nanoscale structure have attracted great attention in international physics, chemistry, and materials, and have rapidly developed into one of the interdisciplinary research hotspots. Aerogel is a typical mesoporous material, belonging to solid material with a disordered mesoporous shape that is irregular but interconnected [ 2 ]. Aerogel is a kind of mesoporous amorphous material with a very high specific surface area (>800 m 2 /g) and very low density (<100 kg/m 3 ), and its porosity can reach more than 80%.…”

Section: The Structural Characteristicsmentioning

confidence: 99%

Thermal Insulation Performance of Aerogel Nano-Porous Materials: Characterization and Test Methods

Lou

Dong

Zhu

et al. 2023

Gels

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Due to the extremely high porosity and extremely low density of nano-porous thermal insulation materials, the characteristic size of the pores inside the materials and the characteristic size of the solid skeleton structure are on the nanometer scale, which leads to the obvious nanoscale effect of the heat transfer law inside the aerogel materials. Therefore, the nanoscale heat transfer characteristics inside the aerogel materials and the existing mathematical models for calculating the thermal conductivity of various heat transfer modes at the nanoscale need to be summarized in detail. Moreover, in order to verify the accuracy of the thermal conductivity calculation model of aerogel nano-porous materials, correct experimental data are required to modify the model. Because the medium is involved in radiation heat transfer, the existing test methods have a large error, which brings great difficulties to the design of nano-porous materials. In this paper, the heat transfer mechanism, characterization methods, and test methods of thermal conductivity of nano-porous materials are summarized and discussed. The main contents of this review are as follows. The first part introduces the structural characteristics and specific application environment of aerogel. In the second part, the characteristics of nanoscale heat transfer of aerogel insulation materials are analyzed. In the third part, the characterization methods of thermal conductivity of aerogel insulation materials are summarized. In the fourth part, the test methods of thermal conductivity of aerogel insulation materials are summarized. The fifth part gives a brief conclusion and prospect.

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“…Li et al utilized SiO 2 aerogel blending and coating to decrease the thermal conductivity of MD membranes. [ 146 ] The findings revealed that the coating process was more efficient than the blending process. Hou et al adopted a different strategy by using nanostructured wood (nanocellulose) as the main material and fabricated a highly thermally efficient hydrophobic nano wood membrane for MD applications.…”

Section: Advanced Nanoenabled MD Membranes For Thermal Efficiency Man...mentioning

confidence: 99%

Advancements in Nanoenabled Membrane Distillation for a Sustainable Water‐Energy‐Environment Nexus

Farid,

Kharraz,

Sun

et al. 2023

Advanced Materials

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The emergence of nano innovations in membrane distillation (MD) has garnered increasing scientific interest. This enabled the exploration of state‐of‐the‐art nano‐enabled MD membranes with desirable properties, which significantly improve the efficiency and reliability of the MD process and open up opportunities for achieving sustainable water‐energy‐environment (WEE) nexus. This comprehensive review provides broad coverage and in‐depth analysis of recent innovations in nano‐enabled MD membranes, focusing on their role in achieving desirable properties, such as strong liquid‐repellence, high resistance to scaling, fouling, and wetting, as well as efficient self‐heating and self‐cleaning functionalities. The recent developments in nano‐enhanced photothermal‐catalytic applications for water‐energy co‐generation within a single MD system are also discussed. Furthermore, we identify the bottlenecks that impede the scale‐up of nano‐enhanced MD membranes and propose a future roadmap for their sustainable commercialization. This holistic overview is expected to inspire future research and development efforts to fully harness the potential of nano‐enabled MD membranes to achieve sustainable integration of water, energy, and the environment.This article is protected by copyright. All rights reserved

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Effects of thermal efficiency in DCMD and the preparation of membranes with low thermal conductivity

Cited by 39 publications

References 39 publications

Bacterial Nanocellulose Aerogel Membranes: Novel High-Porosity Materials for Membrane Distillation

Bacterial Nanocellulose Aerogel Membranes: Novel High-Porosity Materials for Membrane Distillation

Thermal Insulation Performance of Aerogel Nano-Porous Materials: Characterization and Test Methods

Advancements in Nanoenabled Membrane Distillation for a Sustainable Water‐Energy‐Environment Nexus

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