117 research outputs found
Electrochemical synthesis of melanin-like polyindolequinone
No full textConducting polymer is a rapidly developing area of research due to its potential in combining the physical properties of polymers with electrical properties previously found only in inorganic systems. These conducting polymers owe their unique properties to a conjugated polymer backbone and become conducting upon oxidation or reduction.
Melanin, a biopolymer, possess a conjugated backbone required of a conducting polymer, and has shown properties of an amorphous semiconductor. However, there has not been much study done in this area despite its potential, and this is partially due to the lack of processing methods as melanin is generally synthesised as an intractable powder. Thus, a better synthetic method was required, and a possible solution is the use of electrochemical synthesis.
In our previous study we have shown that melanin can be synthesised electrochemically as a free-standing film, which was the first step towards the use of melanin as a bulk material. This project aims to continue from this preliminary work, investigating the various synthetic parameters and possible modifications as well as investigating possible applications for the electrochemically synthesised melanin film
Electrochemical synthesis of melanin free-standing films
No full textFree-standing melanin films were successfully synthesised electrochemically from dopa. The Optimum synthetic conditions such as pH, concentration and current were determined, and it was found that free-standing film,.; could only be formed when ITO glass electrodes were used. The films were analysed by solid state NMR and XPS which showed the presence of indolic moieties characteristic of melanin-type macromolecules. The film showed higher conductivity than chemically synthesised melanin previously reported in literature and also exhibited photoconductivity. (c) 2005 Elsevier Ltd. All rights reserved
Leadership Communications of Prabowo Subianto in Facebook Fanpage
No full textKehadiran media sosial memudahkan setiap orang untuk berkomunikasi dengan konstituennya. Media sosial tidak terhalangi oleh persoalan ruang dan waktu. Sehingga setiap orang bisa berkomunikasi dengan siapapun dan di manapun. Tak terkecuali bagi (calon) pemimpin. Sebagai pemimpin, Prabowo Subianto membuka saluran komunikasi melalui media facebook dan twitter. Permasalahan yang diangkat dalam penelitian adalah bagaimana komunikasi yang dilakukan oleh Prabowo Subianto. Menggunakan metode penelitan analisis naratif, penulis meneliti teks pernyataan Prabowo Subianto tanggal 17 Agustus 2014 menjelang pelantikan presiden periode 2014-2019. Dari hasil penelitian diperoleh kesimpulan bahwa pola berkomunikasi Prabowo Subianto yang dianalisis berdasarkan pernyataan-pernyatannya dalam menyikapi situasi politik selalu berpijak kepada UUD 1945 serta keutuhan bangsa (NKRI). Sedangkan dalam menarasikan sebuah peristiwa kebangsaan Prabowo Subianto juga sangat menekankan bagaimana kepentingan bangsa harus diutamakan dari kepentingan individu dan golongan. Sehingga, kekecewaan yang bersumber dari situasi emosional kelompok menjadi tidak berarti dibandingkan kepentingan dalam menjaga keutuhan bangsa.Social media presence allows every person to communicate with the others. It was not deterred by the problems of space and time. So that every person can communicate with anyone, anywhere. No exception for (candidate) leaders. As a leader, Prabowo open channels of communication through the medium of Facebook and Twitter. The problem of this study is how communication is done by Prabowo. Using narrative analysis research methods, the author examines the text Prabowo statement (August 17, 2014) ahead of the Presidential inauguration period 2014-2019. From the conclusion, that the way of communicating Prabowo analyzed based on the statements in response to the political situation always adheres to the 1945 Constitution and the integrity of the nation. While in narrating a national event Prabowo also emphasizes how the interests of the nation must take precedence over the interests of individuals and groups. Thus, the disappointment that comes from an emotional situation becomes a meaningless group than in the interests of preserving the integrity of the nation
Joko Widodo, Prabowo Subianto i pytania o przyszłość demokracji w Indonezji
No full textIn the article, the author argues that Prabowo Subianto, the new president of Indonesia, despite his military past during the Suharto regime, despite human rights violations and authoritarian disposition, will not introduce a significant breakthrough in the democratic regression in Indonesia. The weakening of democracy in this country is a process that has been ongoing almost since the beginning of the 21st century. The author points out that many undemocratic solutions, as well as an undemocratic style of management, have been somewhat normalized by the current president of Indonesia, Joko Widodo. Thus, Prabowo Subianto is only the closing of the process of autocratization of democracy in Indonesia.W artykule Autor stawia tezę, że Prabowo Subianto, nowy prezydent Indonezji, mimo wojskowej przeszłości w czasach reżimu Suharto, mimo łamania praw człowieka i autorytarnego usposobienia, nie wprowadzi istotnego przełomu w demokratycznym regresie w Indonezji. Słabnięcie demokracji w tym państwie jest procesem trwającym niemal od początku XXI w. Autor wskazuje, że wiele niedemokratycznych rozwiązań, a także niedemokratyczny styl zarządzania zostały niejako znormalizowane przez dotychczasowego prezydenta Indonezji, Joko Widodo. Tym samym Prabowo Subianto stanowi jedynie domknięcie procesu autokratyzacji demokracji w Indonezji
Joko Widodo, Prabowo Subianto and Questions About the Future of Democracy in Indonesia
No full textW artykule Autor stawia tezę, że Prabowo Subianto, nowy prezydent Indonezji, mimo wojskowej przeszłości w czasach reżimu Suharto, mimo łamania praw człowieka i autorytarnego usposobienia, nie wprowadzi istotnego przełomu w demokratycznym regresie w Indonezji. Słabnięcie demokracji w tym państwie jest procesem trwającym niemal od początku XXI w. Autor wskazuje, że wiele niedemokratycznych rozwiązań, a także niedemokratyczny styl zarządzania zostały niejako znormalizowane przez dotychczasowego prezydenta Indonezji, Joko Widodo. Tym samym Prabowo Subianto stanowi jedynie domknięcie procesu autokratyzacji demokracji w Indonezji.In the article, the author argues that Prabowo Subianto, the new president of Indonesia, despite his military past during the Suharto regime, despite human rights violations and authoritarian disposition, will not introduce a significant breakthrough in the democratic regression in Indonesia. The weakening of democracy in this country is a process that has been ongoing almost since the beginning of the 21st century. The author points out that many undemocratic solutions, as well as an undemocratic style of management, have been somewhat normalized by the current president of Indonesia, Joko Widodo. Thus, Prabowo Subianto is only the closing of the process of autocratization of democracy in Indonesia
Novel thiol-ene hybrid coating for metal protection
No full textPublished: 7 April 2016A novel hybrid anticorrosion coating with dual network of inorganic (Si–O–Si) and organic bonds (C–S–C) was prepared on metal through an in situ sol-gel and thiol-ene click reaction. This novel interfacial thin film coating incorporates (3-mercaptopropyl) trimethoxysilane (MPTS) and 1,4-di(vinylimidazolium) butane bisbromide based polymerizable ionic liquid (PIL) to form a thiol-ene based photo-polymerized film, which on subsequent sol-gel reaction forms a thin hybrid interfacial layer on metal surface. On top of this PIL hybrid film, a self-assembled nanophase particle (SNAP) coating was employed to prepare a multilayer thin film coating for better corrosion protection and barrier performance. The novel PIL hybrid film was characterised for structure and properties using Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). The corrosion protection performance of the multilayer coating was examined using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The results reveal that this novel double layer coating on metal offers excellent protection against corrosion and has remarkably improved the barrier effect of the coating.Mona Taghaviksih, Surya Subianto, Naba Kumar Dutta and Namita Roy Choudhur
Effect of polymerized ionic liquid based gel inhibitor on electrochemical performance of self-assembled nanophase coating
No full textThe corrosion process is a surface reaction that can be controlled by the addition of corrosion inhibitors, which adsorb on the reacting metal surface. The inhibitors could be applied to a metal surface in many different ways. In this contribution, influence of polymerized ionic liquid (PIL) was examined on inhibition performance of a coating using carbon steel samples. The PIL was loaded in self-assembled nanophase particle (SNAP) coating and the inhibition behaviour was investigated using potentiodynamic polarization, electrochemical impedance spectroscopy and scanning kelvin probe techniques. The inhibition efficiency of the coating increases with the addition of PIL as observed from potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) measurements. In addition, scanning kelvin probe (SKP) measurement provides further understanding on the strong interfacial properties of the modified coating compared to that of the SNAP.Mona Taghavikish, Surya Subianto, Namita Roy Choudhury, Naba Kumar Dutt
- …
