Influence of pore dimensions of materials on humidity self-regulating performances

Lan, Haoran; Jing, Zhenzi; Li, Jian; Miao, Jiajun; Chen, Yuqian

doi:10.1016/j.matlet.2017.05.095

Cited by 27 publications

(11 citation statements)

References 8 publications

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“…This suggests that the formaldehyde adsorption isotherm belongs to type IV, and thus its adsorption depends mainly on the micropores in the matrix, which is in agreement with the results of this and previous work (Chen et al , 1996). According to our previous work, a pore size of 4.2–7.1 nm in the materials led to effective moisture adsorption/desorption performance (Lan et al , 2017), which might explain why the moisture adsorption data the had a poor fit with type I adsorption isotherm.…”

Section: Resultsmentioning

confidence: 93%

“…After curing for 6 h, more mesopores form, especially in the 4–9 nm range, which also results in the largest specific surface area (111.48 m 2 g –1 ) and pore volume (0.3576 cm 3 g –1 ; Table 5). A pore size of 4.2–7.1 nm might provide effective humidity regulation (Lan et al , 2017) and might explain why curing for 6 h yields the best moisture adsorption/desorption (humidity-regulation) performance. As was mentioned above, after 6 h of curing, abundant sepiolite crystals remained in the matrix, and at the same time Al-tobermorite formed.…”

Section: Resultsmentioning

confidence: 99%

“…According to the classification of the International Union of Pure and Applied Chemistry (IUPAC), the moisture adsorption isotherm belongs to type IV, which indicates the presence of mesopores exhibiting adsorption hysteresis characteristics. Our previous work showed that a pore size from 4.2 to 7.1 nm, such as those found in mesoporous materials, leads to effective moisture adsorption/desorption performance for humidity regulation (Lan et al , 2017). On the other hand, the isotherm of formaldehyde adsorption is of type I (Song et al , 2007), which exhibits mainly microporous adsorption characteristics.…”

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confidence: 99%

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Hydrothermal solidification of sepiolite into a cemented sepiolite aggregate for humidity regulation and formaldehyde removal

Qiu

Cheng

et al. 2020

Clay miner.

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Sepiolite powder was hydrothermally solidified into a cemented, designed to function both in humidity regulation and volatile organic compound (VOC) removal. The solidification process mimicked the cementation of sedimentary rocks. The formation of the calcium aluminium silicate hydrate (C-A-S-H) or Al-tobermorite enhanced the strength (maximum flexural strength >17 MPa) and improved the porosity of the solidified materials. Due to the low temperature of hydrothermal solidification (≤473.15 K), most sepiolite remained in the matrix of the solidified specimens. The cemented sepiolite aggregate shows outstanding humidity-regulating performance (moisture adsorption of 430 g m–2), and the synergistic effects of the residual sepiolite and neoformed Al-tobermorite exerted a positive influence on the humidity regulation performance of the material. Similarly to the behaviour of sepiolite, the solidified material also displayed good formaldehyde-removal capacity (60–68%). The pore dimensions controlled the humidity regulation and formaldehyde removal. The humidity regulation depends on the mesopores, which originate mainly from both the original sepiolite and the neoformed C-A-S-H phases and Al-tobermorite, while the formaldehyde removal depends on the micropores from the original sepiolite in the matrix. As such, the cemented sepiolite aggregate might be hydrothermally synthesized and might be used to improve the comfort and safety of indoor environments for human beings.

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

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Hydrothermal solidification of sepiolite into a cemented sepiolite aggregate for humidity regulation and formaldehyde removal

Qiu

Cheng

et al. 2020

Clay miner.

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“…6) (Zhang et al 2013b). In order to confirm the effect of the pore dimensions on humidity regulation, Lan et al (2017) observed that the effective humidity-regulating performance of materials depends heavily on their pore dimensions (3.5-7.1 nm) (Fig. 7).…”

Section: Humidity-regulating Materialsmentioning

confidence: 89%

Review: Progress with Functional Materials Based on Loess Particles

Shen

Yan

Wang

et al. 2021

Clays and clay miner.

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Loess is a large-scale deposit which is easy to mine and widely distributed on the epipedon. The clay fraction of loess, also known as 'loessial clay', is a very important component of loess which affects its properties and performance. From a 'materials' perspective, the clay fraction of loess has been ignored. Recently, loess particles have attracted interest because of their potential applications. The focus in the current review is on the methods of modifying loess particles and their application as functional materials. The major components of loess particles are clays, calcite, and quartz, with the clays including kaolinite, illite, montmorillonite, and chlorite. Loess has a range of particle sizes, types, and dispersibilities. The particles agglomerate readily, mainly because cementation occurs readily in the clay fraction. Loess particles can be modified and their properties can be improved by compaction, separation, purification, acidification, calcination, surfactant modification, geopolymerization, and polymer modification. Loess-based functional materials have been used as sorbents, eco-friendly superabsorbents, soil and water conservation materials, humidity-regulating materials, and building materials. Separated and purified loess particles can adsorb metal ions and harmful elements directly. Surfactant-modified loess particles can remove organic compounds effectively. After modification with polymers, loess particles exhibit greater capacity for the removal of environmental pollutants such as harmful metal ions and dyes. As a superabsorbent, modified loess shows excellent thermal stability and swelling behavior. Calcined loess could be utilized as an energy-saving building material with good humidityregulating performance, and geological polymerization has further expanded the scope of applications of loess in architecture. In summary, loess-based functional materials, which are inexpensive and ecologically friendly, deserve more attention and further development. Keywords-Application . Clay . Functionalization . Loess-based materials . Loess particles CLASSIFICATION, DISTRIBUTION, COMPOSITION, AND PHYSICOCHEMICAL PROPERTIES OF LOESS Classification and Distribution Loess can be classified from various perspectives. Using the geological and geographical classification, loess has been divided into plateau, intermontane basin,

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“…[6][7][8] A number of bottom-up self assembly methods offer control over the mesoscale material arrangement, including colloidal self-assembly, 9 polymeric porogens, 8,10 and sacrificial "structure-directing agents" (SDAs) such as small molecule surfactants 11,12 or block copolymers (BCPs) [13][14][15] These SDAs interact with inorganic precursors (typically sol-gel derived) in solution and produce ordered hybrid films via evaporation induced coassembly before being removed to reveal the porous network. 16,17 Pore size is a often a crucial parameter for material function, as demonstrated for mesoporous sensors, 6,18,19 photocatalytic materials, 20 perovskite and dye-sensitized solar cells, 1,21 humidity regulation 22 and catalysis. 23 In co-assembly, the size of the pore-forming block directly impacts the length scale of material arrangement.…”

Section: Introductionmentioning

confidence: 99%

Tuning Pore Dimensions of Mesoporous Inorganic Films by Homopolymer Swelling

Reid¹,

Fernandez²,

Schmidt‐Hansberg³

et al. 2019

Preprint

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The functionality and applications of mesoporous inorganic films are closely linked to their mesopore dimensions. For material architectures derived from block copolymer (BCP) micelle co-assembly, the pore size is typically manipulated by changing the molecular weight corresponding to the pore-forming block. However, bespoke BCP synthesis is often a costly and time-consuming process. An alternative method for pore size tuning involves the use of swelling agents, such as homopolymers (HPs), which selectively interact with the core-forming block to increase the micelle size in solution. In this work, poly(isobutylene)-block-poly(ethylene oxide) (PIB-b-PEO) micelles were swollen with poly(isobutylene) HP in solution and co-assembled with aluminosilicate sol with the aim of increasing the resulting pore dimensions. An analytical approach implementing spectroscopic ellipsometry (SE) and ellipsometric porosimetry (EP) alongside the more commonly used atomic force microscopy (AFM) and small angle x-ray scattering in transmission (SAXS) and grazing-incidence (GISAXS) modes enabled to study the material evolution from solution processing through to the manifestation of the mesoporous inorganic film after BCP removal. In-depth SE/EP analysis evidenced an increase of over 40% in mesopore diameter with HP swelling and a consistent scaling of the overall void volume and number of pores. Importantly, our analytical tool-box enabled us to study the effect of swelling on the connecting necks between adjacent pores, with observed increases as high as ≈35%, knowledge of which is crucial to sensing, electrochemical and other mass transfer-dependent applications.

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Influence of pore dimensions of materials on humidity self-regulating performances

Cited by 27 publications

References 8 publications

Hydrothermal solidification of sepiolite into a cemented sepiolite aggregate for humidity regulation and formaldehyde removal

Hydrothermal solidification of sepiolite into a cemented sepiolite aggregate for humidity regulation and formaldehyde removal

Review: Progress with Functional Materials Based on Loess Particles

Tuning Pore Dimensions of Mesoporous Inorganic Films by Homopolymer Swelling

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