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Javid, Amjed,Kumar, Manish,Yoon, Seokyoung,Lee, Jung Heon,Tajima, Satomi,Hori, Masaru,Han, Jeon Geon IOP 2016 Journal of Physics. D, Applied Physics Vol.49 No.26
<P>Carbon thin films, having a combination of unique physical and chemical properties, exhibit an interesting biocompatibility and biological response to living entities. Here, the carbon films are developed in the morphology form of nano-domains with nanoscale inter-domain separations, tuned by plasma conditions in the facing target magnetron sputtering process. The wettability and surface energy are found to have a close relation to the inter-domain separations. The chemical structure of carbon films exhibited the relative enhancement of sp<SUP>3</SUP> in comparison to sp<SUP>2</SUP> with the increase of domain separations. The cell-viability of these films shows promising results for L929 mouse fibroblast and Saos-2 bone cells, when inter-domain separation is increased. Electrical conductivity and surface energy are identified to play the key role in different time-scales during the cell-proliferation process. The contribution from electrical conductivity is dominant in the beginning of the cultivation, whereas with the passage of time (~3–5 d) the surface energy takes control over conductivity to enhance the cell proliferation.</P>
Kumar, Manish,Javid, Amjed,Han, Jeon Geon American Chemical Society 2017 Langmuir Vol.33 No.10
<P>Surface energy (SE) is the most sensitive and fundamental parameter for governing the interfacial interactions in nanoscale carbon materials. However, on account of the complexities involved of hybridization states and surface bonds, achieved SE values are often less in comparison with their theoretical counterparts and strongly influenced by stability aspects. Here, an advanced facing-target pulsed dc unbalanced magnetron-sputtering process is presented for the synthesis of undoped and H/N-doped nanocrystalline carbon thin films. The time-dependent surface properties of the undoped and H/N-doped nanocrystalline carbon thin films are systematically studied. The advanced plasma process induced the dominant deposition of high-energy neutral carbon species, consequently controlling the intercolumnar spacing of nanodomain morphology and surface anisotropy of electron density. As a result, significantly higher SE values (maximum = 79.24 mJ/m(2)) are achieved, with a possible window of 79.24-66.5 mJ/m(2) by controlling the experimental conditions. The intrinsic (size effects and functionality) and extrinsic factors (atmospheric exposure) are resolved and explained on the basis of size-dependent cohesive energy model and long-range van der Waals interactions between hydrocarbon molecules and the carbon surface. The findings anticipate the enhanced functionality of nanocrystalline carbon thin films in terms of selectivity, sensitivity, and stability.</P>
Nasir Sarwar,Munir Ashraf,Muhammad Mohsin,Abdur Rehman,Ayesha Younus,Amjed Javid,Kashif Iqbal,Shagufta Riaz 한국섬유공학회 2019 Fibers and polymers Vol.20 No.11
Importance of multifunctional finishing of textiles is increasing day by day due to greater consumer demand. Cross-linker is one of the commonly used finishes agent to impart functionality in textiles. In this research work theperformance of the formaldehyde free carboxylic acid based eco-friendly cross-linkers; citric acid (CA) and maleic acid(MA) was enhanced by incorporating three different types of metal oxides nanoparticle (ZnO, MgO and CaO). Two differentfixation methods of pad-dry-cure with and without UV irradiation were used. ZnO along with CA and MA was found to bemost effective in increasing crease recovery performance of the cotton fabric followed by MgO while CaO was found to beineffective. Fabric tear strength was also improved by the incorporation of these nanoparticles. Additionally, incorporation ofthese nanoparticles exhibited improvement in the fabric handle and antimicrobial properties.
Muhammad Zaman Khan,Vijay Baheti,Munir Ashraf,Tanveer Hussain,Azam Ali,Amjed Javid,Abdur Rehman 한국섬유공학회 2018 Fibers and polymers Vol.19 No.8
In this research work, multifunctional cotton fabric comprising of UV protection, superhydrophobicity and antibacterial activity has been developed using facile pad-dry-cure method. In the first step, the concentration of repellent chemical has been optimized. Then, formulations containing nanoparticles of ZnO or TiO2 along with optimized concentration of repellent chemical and organic-inorganic binder have been applied to cotton fabric followed by the evaluation of functional properties. The surface morphology and elemental composition of treated fabric has been characterized through SEM and EDX, respectively. The treated samples have shown promising UV protection, superhydrophobicity and antibacterial properties durable upto 20 washing cycles.