Stimuli-Responsive Composite Particles as Solid-Stabilizers for Effective Oil Harvesting

Chen, Yu; Bai, Yongkang; Chen, Shoubing; Ju, Junping; Li, Yuqi; Wang, Tingmei; Wang, Qihua

doi:10.1021/am504124a

Cited by 111 publications

(78 citation statements)

References 23 publications

(29 reference statements)

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“…Nonetheless, their lower MR performance compared to the CI based MR fluids needs to be 70 improved. Chen et al 81 synthesized polymer-coated magnetite composites to harvest oil to form a Pickering emulsion owing to their special wettability, and reported that magnetic field-responsive composites can separate easily from oil/water mixtures; hence, 75 they can be used in practical applications, such as oil recycling. Zhou et al 82 prepared silica nanoparticles with hydrophobic and hydrophilic properties and demonstrated efficient interfacial catalysts of the obtained amphiphilic silica nanoparticles with ethylene glycol by acting as a stabilizer in Pickering emulsions.…”

Section: Siomentioning

confidence: 99%

Celebrating Soft Matter's 10th Anniversary: Stimuli-responsive Pickering emulsion polymerized smart fluids

et al. 2015

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The Pickering emulsion process is an important and interesting way of forming hybrid soft matter particles stabilized by solid particles as surfactants instead of the extensive use of conventionally available organic surfactant molecules. This Highlight briefly reviews stimuli-responsive polymer/inorganic hybrid materials fabricated by Pickering emulsion polymerization along with the rheological characteristics of their electrorheological and magnetorheological smart fluids under electric and magnetic fields, respectively.

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Section: Siomentioning

confidence: 99%

Celebrating Soft Matter's 10th Anniversary: Stimuli-responsive Pickering emulsion polymerized smart fluids

et al. 2015

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“…The control of Pickering emulsions plays a pivotal part in many significant processes, for example, oil extraction and recovery [29,30], emulsion polymerization [31,32,33,34], and heterogeneous catalysis [35,36,37]. In this regard, many endeavors have been made in developing controllable Pickering emulsions.…”

Section: Introductionmentioning

confidence: 99%

Tuning Amphiphilicity of Particles for Controllable Pickering Emulsion

Wang

2016

Materials

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Pickering emulsions with the use of particles as emulsifiers have been extensively used in scientific research and industrial production due to their edge in biocompatibility and stability compared with traditional emulsions. The control over Pickering emulsion stability and type plays a significant role in these applications. Among the present methods to build controllable Pickering emulsions, tuning the amphiphilicity of particles is comparatively effective and has attracted enormous attention. In this review, we highlight some recent advances in tuning the amphiphilicity of particles for controlling the stability and type of Pickering emulsions. The amphiphilicity of three types of particles including rigid particles, soft particles, and Janus particles are tailored by means of different mechanisms and discussed here in detail. The stabilization-destabilization interconversion and phase inversion of Pickering emulsions have been successfully achieved by changing the surface properties of these particles. This article provides a comprehensive review of controllable Pickering emulsions, which is expected to stimulate inspiration for designing and preparing novel Pickering emulsions, and ultimately directing the preparation of functional materials.

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“…Such switchable emulsions have potential applications in colloidal science and engineering, for clearance of chemicals, drug delivery, switchable optical sensing, designing on–off optoelectronic devices, biocatalyst, or colloidal shape control . So far, switchable emulsions have been designed using oil‐in‐water or water‐in‐oil emulsions which are stabilized by switchable emulsifiers, which activate or deactivate upon the action of specific external stimuli such as pH, gas bubbling, light, or magnetic field . However, the use of water‐in‐oil emulsions enforces the switching mechanism to be a two‐step process, since the separated liquids need specific mechanical treatments such as sonication or gas bubbling to return to the initial emulsion form, restricting the practical applications.…”

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confidence: 99%

Self‐Regulated Smectic Emulsion with Switchable Lasing Application

Kim

Lee

López-León

et al. 2019

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be a two-step process, since the separated liquids need specific mechanical treatments such as sonication or gas bubbling to return to the initial emulsion form, [8,9] restricting the practical applications. Moreover, the switchable emulsifiers need to be specially designed according to the physical and chemical properties of the host/guest liquids and switching triggers, which makes this method complicated, time consuming, and expensive. Finally, although it has been demonstrated that self-emulsification methods can produce emulsions with small droplet size, i.e., sub-micrometer, without any mechanical energy input, these processes typically require high concentration of surfactants and are not reversible. [14][15][16] An ideal switchable emulsion should fulfill several requirements. First, the guest liquid should be able to be emulsified in the host medium without the need of a specific emulsifier, since the presence of surfactants would compromise the purity of the involved liquids and potentially decrease the performance of the system in its active form. Second, for high reproducibility and reliability, the system should be capable of reversibly producing droplets of uniform size so that every single droplet in the emulsion performs its particular function in the same way. Third, the system should be able to undergo rapid and infinitely reversible on-off switching without any mechanical treatment. In order to realize this, the host and the guest liquids would need to be semimiscible with a degree of miscibility that could be modulated through physical parameters, such as temperature of the guest material. Since semimiscibility requires a mild hydrophobic interface between the two constituents, nonaqueous systems such as oil-in-oil emulsions seem to be appropriate candidates. Yet, oil-in-oil emulsions are usually unstable due to the low surface tension at the oil-oil interface, for instance, ≈3 mN m −1 for hydrocarbon and silicon oils. [17] Stabilizing oil-in-oil emulsions without the use a specifically designed stabilizer is still a challenge. [18] In this paper, we propose a method to fabricate highly stable switchable emulsions that fulfill the requirements mentioned above. The method consists in mixing silicon oil with a semifluorinated liquid crystal (LC) that display two different smectic phases (SmA and SmE) when decreasing temperature from the isotropic phase. We show that emulsification and demulsification processes occur at the smectic A and isotropic phases respectively, enabling fast switching between the two states via temperature. The elasticity and chemistry of the LC guarantees the stability of the emulsified state without the use of any surfactant. Interestingly, we observe two different kinds of A structurally reversible smectic liquid crystal (LC) emulsion made of semifluorinated rod-type molecules in silicon oil, which is controlled by simple heating and cooling, is presented. Without adding any kind of additives, such as surfactants, polymers or emulsifiers, and without using any special t...

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Stimuli-Responsive Composite Particles as Solid-Stabilizers for Effective Oil Harvesting

Cited by 111 publications

References 23 publications

Celebrating Soft Matter's 10th Anniversary: Stimuli-responsive Pickering emulsion polymerized smart fluids

Celebrating Soft Matter's 10th Anniversary: Stimuli-responsive Pickering emulsion polymerized smart fluids

Tuning Amphiphilicity of Particles for Controllable Pickering Emulsion

Self‐Regulated Smectic Emulsion with Switchable Lasing Application

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