Capillary condensation of water in the mesopores of nitrogen-enriched carbon aerogels

Matsuoka, Takeshi; Hatori, Hiroaki; Kodama, Masaya; Yamashita, Juli; Miyajima, Naoya

doi:10.1016/j.carbon.2004.04.031

Cited by 43 publications

(27 citation statements)

References 16 publications

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“…The nitrogen atom at such sites has a lone pair of electrons, which make it more polar, and thus it can preferentially induce the formation of water clusters by hydrogen bonding. [14] For the bulk phase, the C, N, and O atomic content is 61, 13, and 27 % for PCC-1, respectively, which is very close to the surface compositions, indicating the uniformity of the atom distribution over the whole sample. Surprisingly, after pyrolysis at 700 8C (PCC-2) the N:C and O:C ratios are still over 0.17 and 0.34 (N and O content of 11 and 23 %), and are even over than 0.13 and 0.29 (N and O content of 9 and 21 %) after pyrolysis at 1000 8C (PCC-3) ( Table 1, Figure S4, S5).…”

mentioning

confidence: 68%

“…Furthermore, the amount of N bonded to two sp 2 carbon atoms in a graphene layer, that is, pyridinic‐N and pyrrolic‐N are 37.2 % and 24.3 %, respectively, while the content of graphitic‐N bonded to three sp 2 carbon atoms is 29.3 %. The nitrogen atom at such sites has a lone pair of electrons, which make it more polar, and thus it can preferentially induce the formation of water clusters by hydrogen bonding 14. For the bulk phase, the C, N, and O atomic content is 61, 13, and 27 % for PCC‐1, respectively, which is very close to the surface compositions, indicating the uniformity of the atom distribution over the whole sample.…”

Section: Surface and Bulk Composition Of The Porous Carbon Cuboidsmentioning

confidence: 91%

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Unusual Ultra‐Hydrophilic, Porous Carbon Cuboids for Atmospheric‐Water Capture

et al. 2014

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There is significant interest in high-performance materials that can directly and efficiently capture water vapor, particularly from air. Herein, we report a class of novel porous carbon cuboids with unusual ultra-hydrophilic properties, over which the synergistic effects between surface heterogeneity and micropore architecture is maximized, leading to the best atmospheric water-capture performance among porous carbons to date, with a water capacity of up to 9.82 mmol g(-1) at P/P0 =0.2 and 25 °C (20% relative humidity or 6000 ppm). Benefiting from properties, such as defined morphology, narrow pore size distribution, and high heterogeneity, this series of functional carbons may serve as model materials for fundamental research on carbon chemistry and the advance of new types of materials for water-vapor capture as well as other applications requiring combined highly hydrophilic surface chemistry, developed hierarchical porosity, and excellent stability.

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mentioning

confidence: 68%

Section: Surface and Bulk Composition Of The Porous Carbon Cuboidsmentioning

confidence: 91%

Unusual Ultra‐Hydrophilic, Porous Carbon Cuboids for Atmospheric‐Water Capture

et al. 2014

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“…The presence of polar sites on the surface alters its wettability; as a result, N-CNMs show hydrophilic properties, in distinction to CNMs [73]. A correlation between nitrogen content in the quaternary state and amount of adsorbed water on the nitrogen-containing carbon aerogels was found in [74]; it was supposed that exactly the quaternary nitrogen atoms promote the capillary condensation of water in mesopores.…”

Section: Surface Properties Of N-cnmsmentioning

confidence: 96%

Nitrogen-doped carbon nanomaterials: To the mechanism of growth, electrical conductivity and application in catalysis

2015

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“…24.3 % und der Gehalt an graphitischen N‐Atomen, an die jeweils drei sp 2 ‐C‐Atome gebunden sind, ist zu 29.3 % bestimmt worden. Der Stickstoff in diesen Positionen hat ein freies Elektronenpaar, was ihn hydrophil macht und die Bildung von Wassernestern über H‐Brücken induziert 14. Der Gesamtgehalt an C‐, N‐ und O‐Atomen beläuft sich auf 61, 13 bzw.…”

Section: Oberflächen‐ Und Gesamtzusammensetzung Der Porösen Kohlenstounclassified

Ultrahydrophile poröse Kohlenstoffmaterialien mit quaderförmiger Morphologie und hoher Wasseraufnahmekapazität

et al. 2014

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Experimentell und theoretisch wurde nachgewiesen, dass der Prozess der Wasserspeicherung in Kohlenstoffnanoporen durch zwei Effekte beeinflusst wird: Heteroatom-dekorierte aktive Zentren und die Mikroporenstruktur.[6] Die Bindung von Wasser bei niedrigen Drücken (P/P 0 < 0.2, P 0 = 3080 Pa oder 23.1 mmHg bei 25 8C) ist von funktionellen Gruppen an der Oberfläche, wie O-oder N-dotierten polaren Zentren, abhängig, welche die Bildung von H-Brücken induzieren und damit eine dichte Wasserphase stabilisieren.[6f] Obwohl intensiv geforscht wurde, ist die Wasseraufnahmekapazität (z. B. bei 20 % relativer Feuchtigkeit oder 6000 ppm) für nicht funktionalisierte Kohlenstoffmaterialien [7] < 1 mmol g À1 und für modifizierte Kohlenstoffe < 4 mmol g À1 .[8] Mçgliche Gründe dafür sind 1) eine zu kleine Zahl H-Brücken bildender aktiver Zentren zur Fçrderung der Entstehung eines H-Brückennetzes zwischen den Porenwänden des Kohlenstoffs und der Wasserphase und 2) eine unpassende Mikroporengrçße, die es nicht ermçglicht, H-Brücken zwischen Wassernestern an gegenüberliegenden Porenwänden zu bilden, was lediglich zu dünnen Wasserschichten statt einer vollständig gefüllten Pore führt. Eine weitere Hürde besteht darin, gleichzeitig hohe Mikroporosität und große Mengen an Heteroatom-dotierten aktiven Zentren zu erzielen, da sich diese beiden Parameter normalerweise gegenläufig entwickeln: Eine erhçhte Pyrolysetemperatur führt z. B. zu hohen

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Capillary condensation of water in the mesopores of nitrogen-enriched carbon aerogels

Cited by 43 publications

References 16 publications

Unusual Ultra‐Hydrophilic, Porous Carbon Cuboids for Atmospheric‐Water Capture

Unusual Ultra‐Hydrophilic, Porous Carbon Cuboids for Atmospheric‐Water Capture

Nitrogen-doped carbon nanomaterials: To the mechanism of growth, electrical conductivity and application in catalysis

Ultrahydrophile poröse Kohlenstoffmaterialien mit quaderförmiger Morphologie und hoher Wasseraufnahmekapazität

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