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729 results on '"Yuliarto, Brian"'

27. Inhibition of Polyimide Photodegradation by Incorporation of Titanate Nanotubes into a Composite

Author

Harito, Christian, Bavykin, Dmitry V, Yuliarto, Brian, Dipojono, Hermawan K, and Walsh, Frank C

Subjects
Physics - Chemical Physics, Condensed Matter - Materials Science
Abstract

The effect of UV light exposure on the properties of 6FDA-ODA polyimide and PI-TiNT composites has been studied using Raman spectroscopy, optical microscopy, nanoidentation and TEM.

Published
2020
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28. The Development of Wearable Polymer-Based Sensors: Perspectives

Author

Harito, Christian, Utari, Listya, Putra, Budi Riza, Yuliarto, Brian, Purwanto, Setyo, Zaidi, Syed S. J., Bavykin, Dmitry V., Marken, Frank, and Walsh, Frank C.

Subjects
Physics - Applied Physics, Physics - Instrumentation and Detectors, Physics - Medical Physics
Abstract

The development of smart polymer materials is reviewed and illustrated. Important examples of these polymers include conducting polymers, ionic gels, stimulus-response be used polymers, liquid crystalline polymers and piezoelectric materials, which have desirable properties for use in wearable sensors. This review outlines the mode of action in these types of smart polymers systems for utilisation as wearable sensors. Categories of wearable sensors are considered as tattoo-like designs, patch-like, textile-based, and contact lens-based sensors. The advantages and disadvantages of each sensor types are considered together with information on the typical performance. The research gap linking smart polymer materials to wearable sensors with integrated power systems is highlighted. Smart polymer systems may be used as part of a holistic approach to improve wearable devices and accelerate the integration of wearable sensors and power systems, particularly in health care.

Published
2020
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29. Polymer Nanocomposites having a High Filler Content: Synthesis, Structures, Properties, and Applications

Author

Harito, Christian, Bavykin, Dmitry V., Yuliarto, Brian, Dipojono, Hermawan K., and Walsh, Frank C.

Subjects
Physics - Applied Physics, Condensed Matter - Materials Science
Abstract

The recent development of nanoscale fillers, such as carbon nanotube, graphene, and nanocellulose, allows the functionality of polymer nanocomposites to be controlled and enhanced. However, conventional synthesis methods of polymer nanocomposites cannot maximise the reinforcement of these nanofillers at high filler content. Approaches to the synthesis of high content filler polymer nanocomposites are suggested to facilitate future applications. The fabrication methods address design of the polymer nanocomposite architecture, which encompass one, two, and three dimensional morphology. Factors that hamper the reinforcement of nanostructures, such as alignment, dispersion of filler as well as interfacial bonding between filler and polymer are outlined. Using suitable approaches, maximum potential reinforcement of nanoscale filler can be anticipated without limitations in orientation, dispersion, and the integrity of the filler particle-matrix interface. High filler content polymer composites containing emerging materials such as 2D transition metal carbides, nitrides, and carbonitrides (MXenes) are expected in the future., Comment: 13 000 words, 4 tables and 11 figures

Published
2020
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48. Evoking dynamic Fe–Nx active sites through the immobilization of molecular Fe catalysts on N-doped graphene quantum dots for the efficient electroreduction of nitrate to ammonia.

Author

Rinawati, Mia, Chiu, Yen-Shuo, Chang, Ling-Yu, Chang, Chia-Yu, Su, Wei-Nien, Septiani, Ni Luh Wulan, Yuliarto, Brian, Huang, Wei-Hsiang, Chen, Jeng-Lung, and Yeh, Min-Hsin

Abstract

The excessive energy demand of the conventional Haber–Bosch process for ammonia (NH3) generation, coupled with the disruptive effects of nitrate (NO3−) pollution on the global nitrogen cycle, has made the electrocatalytic nitrate reduction reaction (NO3−RR) an essential exit strategy for sustainable NH3 synthesis. However, the intricate multi-step proton and electron transfer process posed a great challenge in achieving high-efficiency electrocatalysts. In this study, we report a selective and highly active NO3−RR electrocatalyst featuring molecular M–Nx sites derived from the immobilization of Fe ions within N-doped graphene quantum dots (NGQDs). We demonstrated that the formation of molecular Fe–Nx coordination activated the NO3−RR of NGQDs-Fe, despite the initial inactivity of NGQDs. In situ Raman analysis revealed that those Fe–Nx sites served as favourable adsorption sites for *NO3. Such catalyst achieved an FE of 93% and a yield rate of 15.41 mmol h−1 cm−2 for NH3 at −0.8 V (vs. RHE) in an alkaline medium. These findings revealed the preferential sequential 2e− and 6e− transfer pathways over the direct 8e− pathway in the NO3−RR, which provides new mechanistic insights into the nitrate reduction reaction. [ABSTRACT FROM AUTHOR]

Published
2024
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