General destabilization mechanism of pH-responsive Pickering emulsions

2017 ◽  
Vol 19 (45) ◽  
pp. 30790-30797 ◽  
Author(s):  
Thriveni G. Anjali ◽  
Madivala G. Basavaraj
Keyword(s):  
Pickering Emulsion ◽  
Pickering Emulsions ◽  
Ph Responsive ◽  
Emulsion Droplets

pH driven detachment of particles from Pickering emulsion droplets.

scholarly journals An Oligoimide Particle as a Pickering Emulsion Stabilizer

Polymers ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 1071 ◽  
Author(s):  
Yu-Jin Cho ◽  
Dong-Min Kim ◽  
In-Ho Song ◽  
Ju-Young Choi ◽  
Seung-Won Jin ◽  
...  
Keyword(s):  
Particle Concentration ◽  
Pickering Emulsion ◽  
Pickering Emulsions ◽  
Step Method ◽  
Wetting Properties ◽  
Emulsion Droplets ◽  
Step Procedure ◽  
Oil In Water ◽  
One Step ◽  
Oil Emulsions

A pyromellitic dianhydride (PMDA) and 4,4′-oxydianiline (ODA)-based oligoimide (PMDA-ODA) was synthesized by a one-step procedure using water as a solvent. The PMDA-ODA particles showed excellent partial wetting properties and were stably dispersed in both water and oil phases. A stable dispersion was not obtained with comparison PMDA-ODA particles that were synthesized by a conventional two-step method using an organic solvent. Both oil-in-water and water-in-oil Pickering emulsions were prepared using the oligoimide particles synthesized in water, and the size of the emulsion droplet was controlled based on the oligoimide particle concentration. The oligoimide particles were tested to prepare Pickering emulsions using various kinds of oils. The oil-in-water Pickering emulsions were successfully applied to prepare microcapsules of the emulsion droplets. Our new Pickering emulsion stabilizer has the advantages of easy synthesis, no need for surface modification, and the capability of stabilizing both oil-in-water and water-in-oil emulsions.

Facile immobilization of lipase based on Pickering emulsion via a synergistic stabilization by palygorskite–enzyme

Clay Minerals ◽  
2019 ◽  
Vol 54 (3) ◽  
pp. 293-298
Author(s):  
Dong Li ◽  
Min Shen ◽  
Guofan Sun ◽  
Huiran Jin ◽  
Peng Cai ◽  
...  
Keyword(s):  
Optical Microscopy ◽  
Immobilized Lipase ◽  
Aqueous Dispersion ◽  
Pickering Emulsion ◽  
Catalytic Performance ◽  
Pickering Emulsions ◽  
Emulsion Droplets ◽  
Level Of Activity ◽  
High Level

AbstractA Pickering emulsion was prepared via synergistic stabilization of a lipase and palygorskite particles. The optimum conditions for the stabilization of the Pickering emulsion, such as the concentrations of the palygorskite particles and lipase, were explored. The morphology of emulsion droplets was examined using digital optical microscopy and polarizing optical microscopy. The palygorskite–lipase co-stabilized Pickering emulsions were investigated by determination of the adsorption rate, pH and zeta potential of the aqueous dispersion, as well as by determining the contact angle values of the lipase solution on a palygorskite disc that was immersed in toluene. The catalytic performance of the immobilized lipase in the Pickering emulsion was studied via the investigation of its thermal stability, storage stability and reusability. The immobilized lipase showed greater stability than the free lipase. The lipase immobilized by Pickering emulsion retained a high level of activity even after seven periods of recycling.

scholarly journals Controlling the stability of Pickering emulsions by pH-responsive nanoparticles

Soft Matter ◽  
2019 ◽  
Vol 15 (16) ◽  
pp. 3291-3300 ◽  
Author(s):  
Shiyi Qin ◽  
Xin Yong
Keyword(s):  
Pickering Emulsions ◽  
Ph Responsive ◽  
Emulsion Droplets ◽  
Grafted Nanoparticles ◽  
The Stability ◽  
Stability Of Emulsion

The interaction and stability of emulsion droplets can be actively manipulated by using polyelectrolyte-grafted nanoparticles as stabilizers.

scholarly journals NanoTraPPED—A New Method for Determining the Surface Energy of Nanoparticles via Pickering Emulsion Polymerization

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3200
Author(s):  
Andrei Honciuc ◽  
Oana-Iuliana Negru
Keyword(s):  
Surface Energy ◽  
Functional Groups ◽  
Pickering Emulsion ◽  
Contact Angles ◽  
New Method ◽  
Pickering Emulsions ◽  
Surface Functional Groups ◽  
Emulsion Droplets ◽  
Pickering Emulsion Polymerization ◽  
Physicochemical State

Surface energy with its polar and disperse components describes the physicochemical state of nanoparticles’ (NPs) surfaces, and can be a valuable parameter for predicting their bulk behavior in powders. Here, we introduce a new method, namely, Nanoparticles Trapped on Polymerized Pickering Emulsion Droplets (NanoTraPPED), for measuring the surface energy of a series of silica NPs bearing various surface functional groups. The method consists in creating Pickering emulsions from vinyl bearing monomers, immiscible with water, whereas NPs of interest have a stabilizing role, and in the process, become trapped at the monomer/water interface of emulsion droplets. The Pickering emulsion is polymerized, and polymer microspheres (colloidosomes) decorated with NPs are obtained. NanoTraPPED relies on measuring contact angles from the immersion depth of nanoparticles at the interface of various polymer colloidosomes with the electron microscope. The contact angle values are used as input for the Owens-Wendt-Rabel-Kaelble (OWRK) model, to quantitatively determine the total surface energy with water γNP/water, air γNP, and the corresponding polar and dispersive interaction components of NPs carrying -NH2, -SH, -OH, -CN and -C8 surface functional groups, ranking these according to their polarity. Our findings were confirmed independently by calculating the interfacial desorption energies of NPs from contact angles.

Interfacial biocatalysis in bacteria-stabilized Pickering emulsions for microbial transformation of hydrophobic chemicals

2021 ◽  
Author(s):  
Haisheng Xie ◽  
Wenyu Zhao ◽  
Daniel Chikere Ali ◽  
Xuehong Zhang ◽  
Zhilong Wang
Keyword(s):  
Microbial Transformation ◽  
Pickering Emulsion ◽  
Pickering Emulsions

The Pickering emulsion interface is an exceptional habitat for bacteria to grow by simultaneously utilizing hydrophobic and hydrophilic chemicals.

Doubly pH-Responsive Pickering Emulsion

Langmuir ◽  
2008 ◽  
Vol 24 (23) ◽  
pp. 13237-13240 ◽  
Author(s):  
Jian Li ◽  
Harald D. H. Stöver
Keyword(s):  
Pickering Emulsion ◽  
Ph Responsive

Stimuli-responsive Pickering emulsions: recent advances and potential applications

Soft Matter ◽  
2015 ◽  
Vol 11 (18) ◽  
pp. 3512-3529 ◽  
Author(s):  
Juntao Tang ◽  
Patrick James Quinlan ◽  
Kam Chiu Tam
Keyword(s):  
Magnetic Field ◽  
Ionic Strength ◽  
Light Intensity ◽  
Magnetic Field Intensity ◽  
Pickering Emulsion ◽  
Pickering Emulsions ◽  
Stimuli Responsive ◽  
Comprehensive Review ◽  
Potential Applications ◽  
Emulsion Systems

Pickering emulsions with stimuli-responsive properties have, in recent years, received a considerable amount of attention. This paper provides a concise and comprehensive review of Pickering emulsion systems that possess the ability to respond to an array of external triggers, including pH, temperature, CO2concentration, light intensity, ionic strength, and magnetic field intensity.

scholarly journals Optimization of Fluconazole Pickering Emulsion Using Taguchi Orthogonal Array Design

2020 ◽  
Vol 19 (2) ◽  
pp. 169-178
Author(s):  
D Prasanthi ◽  
N Varsha Priya ◽  
Amoolya Chennuri ◽  
PK Lakshmi
Keyword(s):  
Orthogonal Array ◽  
Free Particle ◽  
Coconut Oil ◽  
Topical Delivery ◽  
Pickering Emulsion ◽  
Homogenization Method ◽  
Sesame Oil ◽  
Pickering Emulsions ◽  
Independent Variables ◽  
Dependent Variables

Emulsifier-free, particle-stabilised emulsions called Pickering emulsions of fluconazole for topical delivery, were studied using Taguchi L9 orthogonal array (OA) design. Formulations were prepared by homogenization method, using bentonite in the concentration range of 2-4% w/v, oil phase (coconut oil, oleic acid, sesame oil). In Taguchi L9 OA experimental design, independent variables (oil phase & concentration of bentonite) effect on dependent variables (drug content & release rate) was studied. All the formulations have shown good physicochemical properties. The PS3 formulation containing sesame oil and 4% bentonite was optimized as particle size was found to be 758.0 nm, zeta potential -48 mv, with Q8 of 166.70±0.15μg/cm2, flux of 17.33±0.02 μg/cm2/hr, permeability coefficient of 3.46±0.015 cm/hr×10-3 and skin content of 4.01±0.24 mg/g. The formulations were stable and non-irritant. Hence pickering emulsion of fluconazole using sesame oil can be used for topical delivery as the drug release was maintained at the localised site. Dhaka Univ. J. Pharm. Sci. 19(2): 169-178, 2020 (December)

scholarly journals Geometry and kinetics determine the microstructure in arrested coalescence of Pickering emulsion droplets

Soft Matter ◽  
2019 ◽  
Vol 15 (46) ◽  
pp. 9587-9596 ◽  
Author(s):  
Zhaoyu Xie ◽  
Christopher J. Burke ◽  
Badel Mbanga ◽  
Patrick T. Spicer ◽  
Timothy J. Atherton
Keyword(s):  
Pickering Emulsion ◽  
Emulsion Droplets

We disentangle the influence of shape and kinetics in the structure of arrested Pickering emulsion droplets after coalescence.

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