New Adsorption Model —Theory, Phenomena and New Concept—

Shibata, Osamu; Nakahara, Hiromichi; Moroi, Yoshikiyo

doi:10.5650/jos.ess14213

“…Analysis of Nucleation and 2D Polymer Crystal Formation Process : To gain insight into the formation mechanism of the highly polycrystalline PI‐2DP film, we probed the crystal growth process using time‐dependent TEM imaging. The classical nucleation process of organic crystal follows a two‐step process which involves densification of monomers in the amorphous state followed by the nucleation of crystallites . In other case, monomers polymerize into oligomers where they nucleate either through stacking or through monomer addition onto the template structure .…”

Section: Resultsmentioning

confidence: 99%

Highly Crystalline and Semiconducting Imine‐Based Two‐Dimensional Polymers Enabled by Interfacial Synthesis

Sahabudeen

¹

,

Qi

²

,

Ballabio

³

et al. 2020

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Single‐layer and multi‐layer 2D polyimine films have been achieved through interfacial synthesis methods. However, it remains a great challenge to achieve the maximum degree of crystallinity in the 2D polyimines, which largely limits the long‐range transport properties. Here we employ a surfactant‐monolayer‐assisted interfacial synthesis (SMAIS) method for the successful preparation of porphyrin and triazine containing polyimine‐based 2D polymer (PI‐2DP) films with square and hexagonal lattices, respectively. The synthetic PI‐2DP films are featured with polycrystalline multilayers with tunable thickness from 6 to 200 nm and large crystalline domains (100–150 nm in size). Intrigued by high crystallinity and the presence of electroactive porphyrin moieties, the optoelectronic properties of PI‐2DP are investigated by time‐resolved terahertz spectroscopy. Typically, the porphyrin‐based PI‐2DP 1 film exhibits a p‐type semiconductor behavior with a band gap of 1.38 eV and hole mobility as high as 0.01 cm2 V−1 s−1, superior to the previously reported polyimine based materials.

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“…The discrepancy between the surface potential determined by different techniques is even bigger. For example, the surface potentials of SDS solutions determined by a vibrating plate and ionization electrode decreased with the increase in the surfactant concentration after 0.1 mM [130], but zeta potential measurements show the opposite trend [131]. In addition, the zeta potential values measured by different groups do not agree with each other [30].…”

Section: Accepted Manuscript 50mentioning

confidence: 92%

“…The ultimate solution to the model instability problem is to combine tensiometry with other experimental techniques. The surface excess and surface potential can be measured by several techniques, such as neutron reflection [127], sum frequency generation [128], radiotracer [129], vibrating plate [31], ionization electrode [130] and electrophoresis [131].…”

Section: Accepted Manuscript 50mentioning

confidence: 99%

A critical review of the model fitting quality and parameter stability of equilibrium adsorption models

Peng

¹

,

Nguyen

²

,

Wang

³

et al. 2018

Advances in Colloid and Interface Science

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We reviewed eight commonly used equilibrium adsorption models and examined their underlying assumptions, fitting qualities, and parameter stabilities. We compared several objective functions that have been applied to curve fitting analysis and a few statistics tests that have been performed to evaluate regression quality. The iteratively reweighted least squares algorithm was selected as the most suitable regression method for adsorption models in the presence of heteroscedasticity. The fraction of unexplained variance was selected to indicate the model fitting quality. Two sources of parameter instability were identified: residue instability and function instability. While the definition of the instability caused by residue is well established, we are the first to consider the instability caused by an adsorption model. The models discussed in this article can be applied to many surfactants, such as normal alcohols, polyglycol ethers, and sodium dodecyl sulfate at different salt concentrations. Our results show that both the model fitting quality and parameter instability increase with the number of parameters subject to curve fitting. For the Frumkin-type of reorientation model, the parameter instability can be as high as 25%. The high degree of instability in some complicated adsorption models may invalidate the estimated parameters.Therefore, additional measurements or simulations are required for complicated models to extract reliable model parameters.

show abstract

“…Analysis of Nucleation and 2D Polymer Crystal Formation Process: To gain insight into the formation mechanism of the highly polycrystalline PI-2DP film, we probed the crystal growth process using time-dependent TEM imaging.T he classical nucleation process of organic crystal follows at wostep process which involves densification of monomers in the amorphous state followed by the nucleation of crystallites. [20] In other case,m onomers polymerize into oligomers where they nucleate either through stacking or through monomer addition onto the template structure. [21] Our strategy follows the later one,w here the crystallite nucleates through the addition of monomer onto the surfactant monolayer at the air-water interface.…”

Section: Resultsmentioning

confidence: 99%

Highly Crystalline and Semiconducting Imine‐Based Two‐Dimensional Polymers Enabled by Interfacial Synthesis

Sahabudeen

¹

,

Qi

²

,

Ballabio

³

et al. 2020

View full text Add to dashboard Cite

Single‐layer and multi‐layer 2D polyimine films have been achieved through interfacial synthesis methods. However, it remains a great challenge to achieve the maximum degree of crystallinity in the 2D polyimines, which largely limits the long‐range transport properties. Here we employ a surfactant‐monolayer‐assisted interfacial synthesis (SMAIS) method for the successful preparation of porphyrin and triazine containing polyimine‐based 2D polymer (PI‐2DP) films with square and hexagonal lattices, respectively. The synthetic PI‐2DP films are featured with polycrystalline multilayers with tunable thickness from 6 to 200 nm and large crystalline domains (100–150 nm in size). Intrigued by high crystallinity and the presence of electroactive porphyrin moieties, the optoelectronic properties of PI‐2DP are investigated by time‐resolved terahertz spectroscopy. Typically, the porphyrin‐based PI‐2DP 1 film exhibits a p‐type semiconductor behavior with a band gap of 1.38 eV and hole mobility as high as 0.01 cm2 V−1 s−1, superior to the previously reported polyimine based materials.

show abstract

New Adsorption Model —Theory, Phenomena and New Concept—

Cited by 12 publications

References 17 publications

Highly Crystalline and Semiconducting Imine‐Based Two‐Dimensional Polymers Enabled by Interfacial Synthesis

Highly Crystalline and Semiconducting Imine‐Based Two‐Dimensional Polymers Enabled by Interfacial Synthesis

A critical review of the model fitting quality and parameter stability of equilibrium adsorption models

Highly Crystalline and Semiconducting Imine‐Based Two‐Dimensional Polymers Enabled by Interfacial Synthesis

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