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From 3D to 4D printing – design, material and fabrication for multi-functional multi-materials
Khare, V.,Sonkaria, S.,Lee, G. Y.,Ahn, S. H.,Chu, W. S. SPRINGER 2017 INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND Vol. No.
<P>In the era of multi-dimensional digital printing technology, engineering by multilayered 'top-down' methodologies are redefining manufacturing processes at multi-scale levels with atomic precision permitting unprecedented freedom to design complex structures at will. This challenges the current perception of conventional machining processes for unconventional materials (e.g. smart-stimuli responsive materials) that pose limitations in closing the gap between manufacturing processes and the increasing demand for rapid assembly procedures, miniaturized and cost-effective products predicted for emerging industries supplying innovative products to a rising population of end users. Driven by a growing need for customization, printing technologies are dynamically changing to meet the demands of a global market. Here, the conceptualization of 4D printing (4DP) platform and its impact on manufacturing scales and processes are discussed. Further, a 'new' conceptual insight into 4DP, high precision material design and the 'envisioned' roadmap for 4DP manufacturing is proposed</P>
Directing Oxygen Vacancy Channels in SrFeO<sub>2.5</sub> Epitaxial Thin Films
Khare, Amit,Lee, Jaekwang,Park, Jaeseoung,Kim, Gi-Yeop,Choi, Si-Young,Katase, Takayoshi,Roh, Seulki,Yoo, Tae Sup,Hwang, Jungseek,Ohta, Hiromichi,Son, Junwoo,Choi, Woo Seok American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.5
<P>Transition-metal oxides (TMOs) with brown-millerite (BM) structures possess one-dimensional oxygen. vacancy channels (OVCs), which play a key role in realizing high ionic conduction at low temperatures. The controllability of the vacancy channel orientation, thus, possesses a great potential for practical applications and would provide a better visualization of the diffusion pathways of ions in TMOs. In this study, the orientations of the OVCs in BM-SrFeO2.5 are stabilized along two crystallographic directions of the epitaxial thin films. The distinctively orientated phases are found to be highly stable and exhibit a. considerable difference in their electronic structures and optical properties, which could be understood in terms of orbital anisotropy. The control of the OVC orientation further leads to modifications in the hydrogenation of the BM-SrFeO2.5 thin films. The results demonstrate a strong correlation between crystallographic orientations, electronic structures, and ionic motion in the BM structure.</P>
Khare, Deepa,Choi, Hyunju,Huh, Sung Un,Bassin, Barbara,Kim, Jeongsik,Martinoia, Enrico,Sohn, Kee Hoon,Paek, Kyung-Hee,Lee, Youngsook National Academy of Sciences 2017 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF Vol.114 No.28
<P>Plant pathogens cause huge yield losses. Plant defense often depends on toxic secondary metabolites that inhibit pathogen growth. Because most secondary metabolites are also toxic to the plant, specific transporters are needed to deliver them to the pathogens. To identify the transporters that function in plant defense, we screened Arabidopsis thaliana mutants of full-size ABCG transporters for hypersensitivity to sclareol, an antifungal compound. We found that atabcg34 mutants were hypersensitive to sclareol and to the necrotrophic fungi Alternaria brassicicola and Botrytis cinerea. AtABCG34 expression was induced by A. brassicicola inoculation as well as by methyl-jasmonate, a defense-related phytohormone, and AtABCG34 was polarly localized at the external face of the plasma membrane of epidermal cells of leaves and roots. atabcg34 mutants secreted less camalexin, a major phytoalexin in A. thaliana, whereas plants overexpressing AtABCG34 secreted more camalexin to the leaf surface and were more resistant to the pathogen. When treated with exogenous camalexin, atabcg34 mutants exhibited hypersensitivity, whereas BY2 cells expressing AtABCG34 exhibited improved resistance. Analyses of natural Arabidopsis accessions revealed that AtABCG34 contributes to the disease resistance in naturally occurring genetic variants, albeit to a small extent. Together, our data suggest that AtABCG34 mediates camalexin secretion to the leaf surface and thereby prevents A. brassicicola infection.</P>
Graphene–Ionic Liquid Based Hybrid Nanomaterials as Novel Lubricant for Low Friction and Wear
Khare, Varsha,Pham, Minh-Quan,Kumari, Nitee,Yoon, Hae-Sung,Kim, Chung-Soo,Park, Jae-IL,Ahn, Sung-Hoon American Chemical Society 2013 ACS APPLIED MATERIALS & INTERFACES Vol.5 No.10
<P>Hybrid nanomaterials offer potential scope for an increasing number of novel applications when engineered to deliver usefully functional properties. Recent advancements in the design of new material products that result from interactions among different compositions at the nanoscale and microscale has led to innovative ways to fabricate and process hybrids with altered structural physicochemical properties. An example is the development of novel “lubricants” that make use of ionic liquids (ILs) and their ability to induce exploitable molecular assemblies at the IL–graphene interface. In the present study, we report the potential of graphene–IL hybrid nanomaterials for engineering applications with a focus on “lubricant” properties to reduce frictional forces to enhance tribological performance. The present contribution outlines the wear and tribological properties (friction and lubrication) of a highly viscous IL [BMIM][I] and its comparison with its nanohybrid material counterpart. Detailed structural–microstructural investigations of the nanohybrid materials were performed using X-ray diffraction and microscopic techniques employing scanning electron (SEM), transmission electron (TEM), and high resolution transmission electron (HRTEM) microscopies. A comparative study of the morphology of friction track and wear behavior was assessed by SEM and TEM. These characteristic properties within and outside the friction track were further correlated with physical and chemical interactions obtained by contact angle measurements and Raman spectroscopy and energy dispersive analysis by X-ray (EDAX).</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2013/aamick.2013.5.issue-10/am302761c/production/images/medium/am-2012-02761c_0016.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am302761c'>ACS Electronic Supporting Info</A></P>
Arpita Khare 한국마케팅과학회 2014 Journal of Global Fashion Marketing Vol.5 No.1
This research examines the influence of cosmopolitanism, identification with globalconsumers, and consumers’ susceptibility to interpersonal influence (CSII) on Indianconsumers’ fashion clothing involvement. A survey technique was used for datacollection across seven cities in India. Both metropolitan and non-metropolitan citieswere targeted. The cosmopolitanism factor loaded under two factors: cosmopolitanismrelated to lifestyle (CRL) and cosmopolitanism related to cultural mores (CRCM). Thevalue-expressive factors of normative influence, CRL, self-identification with globalconsumers, and type of city (metropolitan or non-metropolitan) influenced Indianconsumers’ fashion clothing involvement. The fashion clothing market is growing in India, but there is limited research seekingto understand the factors influencing fashion clothing involvement. Findings on theinfluence of global lifestyle, cosmopolitanism, and normative beliefs regarding Indianconsumers’ fashion clothing involvement can be helpful to companies targeting Indianconsumers.