Novel branched liquid crystal oligomers containing azo and Schiff base groups

Sun, Jinru; Ge, Zhong-Xin; Li, Chunyang; Zhang, Ziyun; Wang, Yimin; Jia, Ying‐Gang; Tian, Ming; Yao, Dan-Shu

doi:10.1016/j.molstruc.2022.134322

Cited by 7 publications

(2 citation statements)

References 49 publications

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“…The absorption peak located at 1598–1628 cm –1 stems from the N–H vibration. The peak at 1631 cm –1 corresponded to the CN bond generated by the Schiff base reaction between the primary amine group (−NH 2 ) grafted on the surface of nanosilica and the aldehyde group (−CHO) of dodecanal. − In the FT-IR spectrum, amphiphilic SiO 2 Janus nanoparticle samples exhibited CN bonds that were not present in the amino-modified silica sample, indicating that the hydrophobic alkyl chain had been successfully grafted onto SiO 2 –NH 2 nanoparticles.…”

Section: Resultsmentioning

confidence: 99%

CO₂ Switchable Pickering Emulsion Stabilized by Responsive Janus SiO₂ Nanoparticles for Enhanced Oil Recovery

Wu,

Hou,

et al. 2024

ACS Appl. Nano Mater.

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The CO2-responsive Pickering emulsions employed have garnered considerable attention across enhanced oil recovery agents, delivery of crude, and oilfield-produced fluid treatment. This study focuses on the design of an innovative type of Janus nanoparticle (JNP) and its application in the construction of CO2 stimuli-responsive Pickering emulsions. The emulsion stabilized by JNPs demonstrates swift phase separation subsequent to the injection of CO2. Furthermore, the mechanism of the CO2-stimulated responsiveness enabled by the JNPs was proposed. Based on the Schiff reaction, the synthesis of JNPs was achieved successfully via the Pickering emulsion template method. The properties of the JNPs were studied using various analytical techniques such as Fourier transform infrared, thermogravimetric analysis, scanning electron microscopy, transmission electron microscopy, etc. The developed responsive system, composed of JNPs and sodium oleate surfactant, showed high interfacial activity at the oil/water interface. The study revealed that the responsive system-stabilized Pickering emulsions could remain stable at 70 °C and room temperature for 24 and 120 h, respectively. Furthermore, the introduction of CO2 for 1.5 min resulted in phase separation because the nanoparticles lost the amphiphilic nature, triggering a significant decrease in interfacial activity and the protonation of sodium oleate surfactant inactivation. Then, the particles started to desorb from the interface. This study proposes a convenient, simple, and cost-effective approach for preparing fast CO2-responsive Pickering emulsions. It provides novel insights into the advancement of oilfield-produced fluid treatment, transportation of crude oil, and enhanced oil recovery.

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Section: Resultsmentioning

confidence: 99%

CO₂ Switchable Pickering Emulsion Stabilized by Responsive Janus SiO₂ Nanoparticles for Enhanced Oil Recovery

Wu,

Hou,

et al. 2024

ACS Appl. Nano Mater.

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“…When cholesteryl mono-, bis-or tripodal molecules were performed with branched azobenzenes, it was shown that the liquid crystal phase behavior was closely related to the number of mesogenic units and the rigidity and flexibility of the structure. Indeed, the mesophase ranges were widened as the chain length increased in the same series, or when de degree of branching increased [87]. Halogenated (and especially fluorinated) compounds (LC3 series, Figure 5) can exhibit smectic A phase, even with high chain length [88].…”

Section: Liquid Crystalsmentioning

confidence: 99%

Azobenzene-Containing Schiff-Bases—Syntheses and Dyes Applications

Leonard,

Takeda,

Akitsu

2024

Colorants

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Azo-Schiff bases contain an azo photochrome showing isomerization accompanying with color change, and an imine moiety (which can contribute to the metal complexation capability). The syntheses of these molecules will be described, and their dyes applications will be discussed, such as for fuel cells, as photometric or colorimetric sensors. In addition, liquid crystals and their antibacterial efficiencies will also be discussed.

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Azomethine-functionalized organic–inorganic framework: an overview

et al. 2023

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Novel branched liquid crystal oligomers containing azo and Schiff base groups

Cited by 7 publications

References 49 publications

CO₂ Switchable Pickering Emulsion Stabilized by Responsive Janus SiO₂ Nanoparticles for Enhanced Oil Recovery

CO₂ Switchable Pickering Emulsion Stabilized by Responsive Janus SiO₂ Nanoparticles for Enhanced Oil Recovery

Azobenzene-Containing Schiff-Bases—Syntheses and Dyes Applications

Azomethine-functionalized organic–inorganic framework: an overview

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Novel branched liquid crystal oligomers containing azo and Schiff base groups

Cited by 7 publications

References 49 publications

CO2 Switchable Pickering Emulsion Stabilized by Responsive Janus SiO2 Nanoparticles for Enhanced Oil Recovery

CO2 Switchable Pickering Emulsion Stabilized by Responsive Janus SiO2 Nanoparticles for Enhanced Oil Recovery

Azobenzene-Containing Schiff-Bases—Syntheses and Dyes Applications

Azomethine-functionalized organic–inorganic framework: an overview

Contact Info

Product

Resources

About

CO₂ Switchable Pickering Emulsion Stabilized by Responsive Janus SiO₂ Nanoparticles for Enhanced Oil Recovery

CO₂ Switchable Pickering Emulsion Stabilized by Responsive Janus SiO₂ Nanoparticles for Enhanced Oil Recovery