scholarly journals GRAPHENE OXIDE MICROCAPSULES (GOMs) WITH LINSEED OIL CORE VIA PICKERING EMULSION METHOD: EFFECT OF DISPERSE SPEED

2021 ◽  
Vol 22 (1) ◽  
pp. 213-222
Author(s):  
Nurul Nadiah Sahir ◽  
Noor Azlina Hassan ◽  
Norita Binti Hassan ◽  
Norhasnidawani Binti Johari
Keyword(s):  
Graphene Oxide ◽  
Phase Separation ◽  
Linseed Oil ◽  
Pickering Emulsion ◽  
Optical Microscope ◽  
Coating System ◽  
Self Healing ◽  
Promising Candidate ◽  
Emulsion Method ◽  
Method Effect

Graphene oxide microcapsules (GOMs) have been prepared through Pickering emulsion method by varying the disperse speed to study its effect on the GOM’s size. The GOMs were characterized through phase separation observation, polarized optical microscope (POM), and particle size analyser (PSA). Phase separation observation showed more viscous and cloudy emulsion was produced when the disperse speed was increased. After 24 hours, only 800 rpm emulsion did not show any phase separation. POM characterization depicted that increasing the emulsification energy led to the finer emulsion with the 1200 rpm sample showing the smallest microcapsule size of around 8 ?m. However, PSA analysis suggested that although the disperse speed controls the GOMs size, the amount of GO in the emulsion plays an important role for the microcapsule to maintain its stability. Emulsion produced at 800 rpm possesses satisfactory stability with GOMs diameter of 11.15 ?m. The result also suggested that graphene oxide encapsulated linseed oil may act as a promising candidate for healing microcapsules in a self-healing coating system. ABSTRAK: Mikrokapsul graphene oksida (GOMs) telah dihasilkan melalui kaedah emulsifikasi Pickering dengan memvariasikan tenaga pengemulsi untuk mengkaji kesannya terhadap saiz GOMs. GOMs dicirikan melalui pemerhatian pemisahan fasa, mikroskop optik polarisasi (POM) dan penganalisis saiz zarah (PSA). Pemerhatian pemisahan fasa menunjukkan emulsi yang lebih likat dan keruh dihasilkan apabila kelajuan pengemulsi meningkat. Selepas 24 jam, hanya emulsi 800 rpm tidak menunjukkan pemisahan fasa. Pencirian POM meunjukkan bahawa peningkatan tenaga pengemulsi menghasilkan emulsi yang lebih halus dengan sampel 1200 rpm menunjukkan saiz mikrokapsul terkecil, sekitar 8 ?m. Walau bagaimanapun, analisis PSA mencadangkan bahawa walaupun kelajuan pengemulsi mengawal saiz GOMs, jumlah GO dalam emulsi memainkan peranan penting untuk mengekalkan kestabilan mikrokapsul. Emulsi yang dihasilkan pada 800 rpm mempunyai kestabilan yang memuaskan dengan purata saiz GOMs sekitar 11.15 ?m. Berdasarkan dapatan kajian, graphene oksida yang terkandung minyak biji rami boleh menjadi salah satu mikrokapsul penyembuh dalam sistem cat auto-sembuh.

Encapsulation of linseed oil in graphene oxide shells for preparation of self-healing composite coatings

2019 ◽  
Vol 129 ◽  
pp. 285-291 ◽  
Author(s):  
Jing Li ◽  
Zhenwei Li ◽  
Qingkang Feng ◽  
Hanxun Qiu ◽  
Guangzhi Yang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Linseed Oil ◽  
Composite Coatings ◽  
Self Healing

Preparation of Graphene–Polypyrrole Hollow Sphere by Pickering Emulsion Method and Their Electrochemical Performances as Supercapacitor Electrode

NANO ◽  
2019 ◽  
Vol 14 (05) ◽  
pp. 1950056
Author(s):  
Sai Wu ◽  
Jie Tian ◽  
Xianglu Yin ◽  
Wei Wu
Keyword(s):  
Graphene Oxide ◽  
Hollow Sphere ◽  
Pickering Emulsion ◽  
Electrochemical Performances ◽  
Test Results ◽  
Supercapacitor Electrode ◽  
Emulsion Method ◽  
Pickering Emulsion Polymerization ◽  
First Time ◽  
A Current

Graphene–polypyrrole hollow sphere composite was synthesized for the first time via Pickering emulsion polymerization using graphene oxide as Pickering stabilizer. It was found that polypyrrole and graphene were well hybrid and all graphene–polypyrrole composites had a uniform hollow sphere structure, whose diameters gradually decreased as the pyrrole content decreased. The electrochemical properties of the composites as supercapacitor electrode were investigated. The test results displayed that the specific capacitance of the optimal ratio of composite could reach 238[Formula: see text]F/g at a current density of 1[Formula: see text]A/g, and a 90.7% capacitance retention could be achieved after 1500 cycles, which was a significant improvement compared with the 62.2% retention of pure polypyrrole.

Fabrication of Janus graphene oxide hybrid nanosheets by Pickering emulsion template for self-healing nanocomposite hydrogels

2020 ◽  
Vol 385 ◽  
pp. 123962 ◽  
Author(s):  
Anyao Ma ◽  
Guanglin Wang ◽  
Zhenglong Yang ◽  
Liangjiu Bai ◽  
Hou Chen ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Pickering Emulsion ◽  
Self Healing ◽  
Nanocomposite Hydrogels

scholarly journals Bioinspired Living Coating System in Service: Evaluation of the Wood Protected with Biofinish during One-Year Natural Weathering

Coatings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 701
Author(s):  
Faksawat Poohphajai ◽  
Jakub Sandak ◽  
Michael Sailer ◽  
Lauri Rautkari ◽  
Tiina Belt ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Scots Pine ◽  
Critical Factor ◽  
Climatic Conditions ◽  
Natural Weathering ◽  
Surface Finishing ◽  
Attractive Alternative ◽  
Coating System ◽  
Self Healing ◽  
Wood Protection

The service life performance of timber products exposed to natural weathering is a critical factor limiting the broad use of wood as an external building element. The goal of this study was to investigate the in-service characterization of an innovative biofinish coating system. It is a novel surface finishing solution based on the bioinspired concept of living fungal cells designed for effective wood protection. The performance of Scots pine (Pinus sylvestris L.) wood coated with biofinish was compared with uncoated references. Samples were exposed to natural weathering for 12 months under the climatic conditions of northern Italy. The visual appearance, colour, gloss, wettability, and 3D surface topography of the wood surface were examined. Results revealed that the total colour changes (∆E) of biofinish-coated wood were negligible. Untreated Scots pine wood revealed the changes in colour after just three months of exposure. The gloss changes of both surface types were small. The contact angle measured on biofinish-coated wood was higher compared to that of uncoated Scots pine. Surface roughness increased in uncoated wood due to the erosion effect caused by the weathering progress. Conversely, the surface roughness of biofinish-coated samples decreased along the exposure time. This phenomenon was explained by two self-healing mechanisms: migration of non-polymerized oil to the cracked surface, where it polymerizes and creates a closed layer, and local regrowth to cover damaged spots by living fungal cells present in the coating. The obtained results revealed the superior aesthetic performance of the biofinish surface treatment against natural weathering. By considering the fully bio-based nature of the investigated coating, it was concluded that this solution can be an attractive alternative for state-of-the-art wood protection technologies.

Pickering emulsion-fabricated polystyrene–graphene oxide microspheres and their electrorheology

2014 ◽  
Vol 2 (36) ◽  
pp. 7541 ◽  
Author(s):  
Sang Deuk Kim ◽  
Wen Ling Zhang ◽  
Hyoung Jin Choi
Keyword(s):  
Graphene Oxide ◽  
Pickering Emulsion

Preparation of graphene-based aerogels by Pickering emulsion method and their performance

2020 ◽  
pp. 1-10
Author(s):  
Huie Liu ◽  
Xiaoxiao Xiang ◽  
Zexin Liu ◽  
Fan Yang ◽  
Zimei Lin ◽  
...  
Keyword(s):  
Pickering Emulsion ◽  
Emulsion Method

scholarly journals A highly sensitive biosensor based on methacrylated graphene oxide-grafted polyaniline for ascorbic acid determination

2020 ◽  
Vol 9 (1) ◽  
pp. 760-767 ◽  
Author(s):  
Seyed Morteza Naghib ◽  
Farahnaz Behzad ◽  
Mehdi Rahmanian ◽  
Yasser Zare ◽  
Kyong Yop Rhee
Keyword(s):  
Ascorbic Acid ◽  
Graphene Oxide ◽  
Current Response ◽  
Functionalized Graphene ◽  
Serum Samples ◽  
Promising Candidate ◽  
Graphene Nanocomposites ◽  
Selective Determination ◽  
Highly Sensitive

AbstractFunctionalized graphene-based nanocomposites have opened new windows to address some challenges for increasing the sensitivity, accuracy and functionality of biosensors. Polyaniline (PANI) is one of the most potentially promising and technologically important conducting polymers, which brings together the electrical features of metals with intriguing properties of plastics including facile processing and controllable chemical and physical properties. PANI/graphene nanocomposites have attracted intense interest in various fields due to unique physicochemical properties including high conductivity, facile preparation and intriguing redox behavior. In this article, a functionalized graphene-grafted nanostructured PANI nanocomposite was applied for determining the ascorbic acid (AA) level. A significant current response was observed after treating the electrode surface with methacrylated graphene oxide (MeGO)/PANI nanocomposite. The amperometric responses showed a robust linear range of 8–5,000 µM and detection limit of 2 µM (N = 5). Excellent sensor selectivity was demonstrated in the presence of electroactive components interfering species, commonly found in real serum samples. This sensor is a promising candidate for rapid and selective determination of AA.

Robust, anti-fatigue, and self-healing graphene oxide/hydrophobically associated composite hydrogels and their use as recyclable adsorbents for dye wastewater treatment

2015 ◽  
Vol 3 (33) ◽  
pp. 17445-17458 ◽  
Author(s):  
Wei Cui ◽  
Jin Ji ◽  
Yi-Feng Cai ◽  
Hang Li ◽  
Rong Ran
Keyword(s):  
Wastewater Treatment ◽  
Graphene Oxide ◽  
Self Healing ◽  
Dye Wastewater ◽  
Composite Hydrogels ◽  
Recyclable Adsorbent

Illustration of a self-healing, anti-fatigue GHA gel being applied as a recyclable adsorbent for dye wastewater treatment.

High effective enrichment of U(vi) from aqueous solutions on versatile crystalline carbohydrate polymer-functionalized graphene oxide

2021 ◽  
Vol 50 (39) ◽  
pp. 14009-14017
Author(s):  
Hai Wang ◽  
Renrong Liu ◽  
Huifang Wang ◽  
Baowei Hu ◽  
Muqing Qiu
Keyword(s):  
Graphene Oxide ◽  
Energy Storage ◽  
Aqueous Solutions ◽  
Functional Groups ◽  
Void Ratio ◽  
Functionalized Graphene ◽  
Promising Candidate ◽  
Functionalized Graphene Oxide ◽  
Carbohydrate Polymer ◽  
Environmental Decontamination

The highly effective enrichment of U(vi) on COF/GO was attributed to a huge void ratio and a variety of oxygen-containing functional groups. It could be used as a promising candidate for environmental decontamination and energy storage.

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