Stabilization of pickering emulsions by generating complex colloidal layers at liquid–liquid interfaces

Lee, Geun Ju; Son, Han Am; Cho, Jang Woo; Choi, Sang Koo; Kim, Hyun Tae; Kim, Jinwoong

doi:10.1016/j.jcis.2013.09.015

Cited by 42 publications

(18 citation statements)

References 23 publications

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“…Interestingly, both emulsions demonstrated negligible hysteresis within the range of shear rate investigated, indicating their stability during the shearing. In a previous study on Pickering emulsions stabilised by fumed silica, it was reported that the emulsions were stable against coalescence at a shear stress up to 1000 Pa and the emulsions reversed to their original state after the removal of the stress (Lee et al, 2014). However, this observation was in contrast to some other findings on Pickering emulsions stabilised by silica particles (French, Taylor, Fowler, & Clegg, 2015;Whitby & Krebsz, 2014;Whitby, Fischer, Fornasiero, & Ralston, 2011), where shearing from 0.1 to 1000 s 1 resulted in droplet coalescence (Whitby, Fischer, Fornasiero, & Ralston, 2011).…”

Section: Ph Conditionsmentioning

confidence: 80%

Pickering emulsions stabilised by hydrophobically modified cellulose nanocrystals: Responsiveness to pH and ionic strength

Loveday

Singh

et al. 2020

Food Hydrocolloids

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The aims of this study were to hydrophobically modify cellulose nanocrystals (CNCs), investigate the ability of such modified CNCs (MCNCs) to stabilise Pickering oil-in-water (O/W) emulsions and understand their stability at different pHs (2.0-7.0) and ionic strengths (0-150 mM NaCl). Structural changes that resulted from esterifying CNCs with octenyl succinic anhydride (OSA) were determined using Fourier transform infrared (FTIR) spectroscopy, X-ray diffractometry (XRD), transmission electron microscopy (TEM) and wettability analysis. The stability of the Pickering O/W emulsions (20 wt% oil, 0.05 1.00 wt% MCNCs) was assessed using droplet sizing, microscopy,-potential, apparent viscosity and oscillatory rheological measurements. FTIR spectroscopy confirmed a decrease in the intensity of the-OHassociated band because of reaction of the hydroxyl group with OSA. XRD indicated a lower (11.5%) crystallinity index in MCNCs. TEM revealed that there was no change in morphology of the needle-shaped CNCs upon OSA modification (length/diameter = 40 100 nm/2 4 nm). Hydrophobic modification of CNCs with OSA was evidenced by an increase in static water contact angle from 56 o (untreated CNCs) to 80.2 o (MCNCs) which allowed the MCNCs to be partially wetted by both the phases and stabilise O/W emulsions. The Pickering emulsions showed droplet flocculation at pH < 4.0 (without addition of NaCl) or ionic strength ≥ 20 mM NaCl (pH 7.0), with a predominant elastic gel-like behaviour observed at ≥ 20 mM NaCl. Resistance of MCNC-based Pickering emulsions to coalescence and responsiveness to flocculation at bio-relevant pHs and ionic strengths show promise in the design of delivery vehicles.

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Section: Ph Conditionsmentioning

confidence: 80%

Pickering emulsions stabilised by hydrophobically modified cellulose nanocrystals: Responsiveness to pH and ionic strength

Loveday

Singh

et al. 2020

Food Hydrocolloids

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“…Pendidikan adalah suatu cara yang terdiri dari tiga dimensi diantaranya individu, masyarakat atau komunitas nasional dari individu tersebut dan seluruh kandungan realitas, baik material maupun spiritual yang menentukan sifat, nasib, dan bentuk manusia maupun masyarakat (Nurkholis, 2013). Pendidikan merupakan suatu sistem yang terbangun dari beberapa komponen yang saling berhubungan dan dapat membantu manusia untuk mencapai kemampuan yang optimal (Saat, 2015). Pendidikan dianggap penting bagi setiap manusia karena dapat meningkatkan kualitas hidup.…”

Section: Pendahuluanunclassified

Membangun Karakter Nasionalisme Melalui Pengembangan Bahan Ajar Ensiklopedia pada Materi Tokoh-tokoh Proklamasi

Sulistyowati

Wahidiyah

Setiawan

2019

JMK

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Pentingnya membangun karakter nasionalis pada era sekaarang sangatlah penting. Upaya tersebut efektif dilaksanakan dalam pembelajaran disekolah dengan dukungan materi ajar yang menarik. Materi IPS khususnya tokoh-tokoh proklamasi merupakan contoh karakter nasionalis yang dapat di tauladani siswa. Pelaksanaan penelitian ini untuk mendeskripsikan: proses pengembangan, kelayakan, kepraktisan, dan keefektifan bahan ajar ensiklopedia berkarakter nasionalisme. Penelitian pengembangan ini menggunakan model 4D (four-D) yang dimodifikasi menggunakan tiga tahapan saja, yaitu: tahap pendefinisian, tahap perancangan, dan tahap pengembangan. Subjek uji coba adalah 19 siswa kelas V SDN Sengguruh. Instrumen pengumpulan data menggunakan angket dan dokumentasi. Hasil penelitian menunjukkan bahwa bahan ajar ensiklopedia layak, praktis dan efektif untuk digunakan. Penilaian oleh ahli media mendapatkan presentase 80%, ahli bahasa mendapatkan presentase 80%, penilaian ahli materi mendapatkan presentase 77,2 %, penilaian praktisi mendapatkan presentase 95,4 %, penilaian siswa mendapatkan presentase 92%, sedangkan untuk keefektifan mendapatkan 78,5%. Berdasarkan paparan hasil penilaian maka bahan ajar ensiklopedia “Layak” dan “Sangat Baik” digunakan di lapangan The importance of building nationalist character in the present era is very important. These efforts are effectively implemented in school learning with the support of interesting teaching material. IPS material, especially the figures of the proclamation, are examples of nationalist characters that can be taught by students. The implementation of this research is to describe: the process of developing, feasibility, practicality, and effectiveness of encyclopedia teaching materials characterized by nationalism. This development research uses a 4D (four-D) model that is modified using only three stages, namely: the stage of defining, designing, and developing. The subjects of the trial were 19 fifth grade students at Sengguruh Elementary School. The instrument of data collection uses questionnaires and documentation. The results showed that encyclopedia teaching materials were feasible, practical and effective to use. Evaluation by media experts gets a percentage of 80%, linguists get 80% percentage, assessment of material experts get a percentage of 77.2%, practitioner assessment gets a percentage of 95.4%, assessment of students get a percentage of 92%, while for effectiveness get 78.5% . Based on the explanation of the results of the assessment, the encyclopedia teaching material "Worthy" and "Very Good" was used in the field

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“…Therefore, their particle size should be in the nanoscale. If the particles are too small, however, they readily come off from the oil–water interface due to the low adhesion energy, thereby reducing the structural stability of the pickering emulsion drops . Moreover, the nanoparticles assembled at the oil–water interface should provide the drops with a repulsive force enough to prevent drop‐to‐drop coalescence.…”

Section: Introductionmentioning

confidence: 99%

Associative Polymer‐grafted Magnetic Nanoparticles for Stabilization and Recovery of Pickering Emulsions

Choi

Son

Park

et al. 2018

Bulletin Korean Chem Soc

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Herein we introduce a smart Pickering emulsion fluid system, in which associative magnetic nanoparticles (AMNPs) are assembled at the oil-water interface to give magnetic-responsiveness to the emulsion drops. AMNPs are synthesized by grafting hydrophobically modified water-soluble poly(2-methacryloyloxyethylphosphorylcholine-co-stearyl methacrylate) onto silica-coated Fe 2 O 3 nanoparticles (NPs) using surface-mediated living radical polymerization. Use of this synthetic protocol allows us to obtain AMNPs with a hydrophobically associative polymer layer with thickness of a few nanometers. We reveal that the AMNPs not only adsorb effectively on the oil-water interface due to the hydrophobic interaction, but also structurally stabilize the pickering emulsion due to the induction of electrostatic repulsion between droplets. Interestingly, we observe that the flow behavior of AMNPs-stabilized pickering emulsions is kinetically controllable in response to the applied magnetic field, thus demonstrating their practical applicability for magnetic-responsive enhanced oil recovery.

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Stabilization of pickering emulsions by generating complex colloidal layers at liquid–liquid interfaces

Cited by 42 publications

References 23 publications

Pickering emulsions stabilised by hydrophobically modified cellulose nanocrystals: Responsiveness to pH and ionic strength

Pickering emulsions stabilised by hydrophobically modified cellulose nanocrystals: Responsiveness to pH and ionic strength

Membangun Karakter Nasionalisme Melalui Pengembangan Bahan Ajar Ensiklopedia pada Materi Tokoh-tokoh Proklamasi

Associative Polymer‐grafted Magnetic Nanoparticles for Stabilization and Recovery of Pickering Emulsions

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