Solvent-dependent valence tautomerism and polarization switching in a heterodinuclear [CrCo] complex

Zheng, Wenwei; Zhang, Xiaopeng; Shui, Qirui; Fukuyama, Tatsuki; Xu, Wen-huang; Huang, Yu-bo; Ji, Tianchi; Zhou, Ziqi; Uematsu, Mikoto; Su, Sheng-Qun; Kanegawa, Shinji; Wu, Shu-Qi; Sato, Osamu

doi:10.1039/d4qi00836g

Inorg. Chem. Front.

2024

DOI: 10.1039/d4qi00836g

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Solvent-dependent valence tautomerism and polarization switching in a heterodinuclear [CrCo] complex

Wenwei Zheng,

Xiaopeng Zhang,

Qirui Shui

et al.

Abstract: Macroscopic polarization switching via directional electron transfer has attracted great attention owing to its potential application in data storage devices, sensors, and energy conversion. However, the acquisition of the desired...

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Realizing the Rapid Release of Drag Reducers via pH-Induced Oil Phase Transition of Inverse Emulsion

Zhang,

Zhi,

et al. 2024

Langmuir

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As a key component of slickwater fracturing fluids, emulsion drag reducers play a vital role. The dissolving capacity of traditional emulsion drag reducers is improved by adding hydrophilic surfactants, which leads to poor stability of the emulsion drag reducer. In order to eliminate the contradiction between stability and release of the emulsion drag reducer, here, pH-responsive polymer emulsion was fabricated using the switching solvent (HA) and white oil as the continuous phase. Monomer emulsions exhibit obvious pH-responsive behavior. This is because the deprotonation of HA by pH stimulation leads to a change in the oil−water ratio of the emulsion, thereby facilitating the demulsification of emulsion. The remarkable stability of the monomer emulsion benefits the preparation of inverse emulsion polymers (P(AM-AA-AMPS)). The obtained P(AM-AA-AMPS) polymer emulsion features remarkable stability even after 15 days of storage. Importantly, the P(AM-AA-AMPS) polymer was released from the emulsion efficiently by pH stimulation instead of introducing an extra hydrophilic surfactant, which confirmed the improvement of polymer release by pH stimulation. The viscosity of the P(AM-AA-AMPS) polymer aqueous solution reaches a maximum value of 96 mPa s within 80 s at a pH value of 9.2. The release efficiency of P(AA-AM-AMPS) polymer emulsion is increased by 33% in comparison with that of traditional polymer emulsion (2 min). The P(AM-AA-AMPS) emulsion demonstrated remarkable dragreduction performance by achieving a drag-reduction rate of 73% at a concentration of 0.05 wt %. P(AM-AA-AMPS) polymer emulsion with pH responsiveness eliminates the contradiction between the stability and release of emulsion drag reducers. Research based on pH-responsive P(AM-AA-AMPS) polymer emulsion provides other ideas for the development of quickly dissolving and long-term storage drag reducers, which is helpful for the development of low-permeability oil and gas resources.

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Realizing the Rapid Release of Drag Reducers via pH-Induced Oil Phase Transition of Inverse Emulsion

Zhang,

Zhi,

et al. 2024

Langmuir

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Solvent-dependent valence tautomerism and polarization switching in a heterodinuclear [CrCo] complex

Abstract: Macroscopic polarization switching via directional electron transfer has attracted great attention owing to its potential application in data storage devices, sensors, and energy conversion. However, the acquisition of the desired...

Cited by 1 publication

References 55 publications

Realizing the Rapid Release of Drag Reducers via pH-Induced Oil Phase Transition of Inverse Emulsion

Realizing the Rapid Release of Drag Reducers via pH-Induced Oil Phase Transition of Inverse Emulsion

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