This study examined the effects of user interactivity with VR in a digital retail setting on mental imagery and sensory brand app experience and its consequential impacts on perceived enjoyment, perceived usefulness, attitude toward using VR, and behavioral intent. Mental imagery is understood in relation to quantity, vividness, and valence. The user involvement with the device is employed as a moderator to fully understand the impact of VR in connection with consumer engagement. An IKEA VR application was utilized for this study. A convenient sample of college students was recruited from a large research university in the US. The findings of the study show that user interactivity impacts mental imagery, and it subsequently influences sensory brand app experience, perceived enjoyment, perceived usefulness, attitude toward using VR, and behavioral intent. Overall, this study provides meaningful and practical information to academicians and practitioners.

Various types of optical materials and devices used in special environments must satisfy durability and optical properties. In order to improve the durability of zinc sulfide multispectral (MS ZnS) substrates with transmission wavelengths from visible to infrared, Ge-Sb-Se-based chalcogenide glass was used as a sealing material to bond the MS ZnS substrates. Wetting tests of the Ge-Sb-Se-based chalcogenide glass were conducted to analyze flowability as a function of temperature, by considering the glass transition temperature (Tg) and softening temperature (Ts). In the wetting test, the viscous flow of the chalcogenide glass sample was analyzed according to the temperature. After placing the chalcogenide glass disk between MS ZnS substrates (20 × 30 mm), the sealing test was performed at a temperature of 485 °C for 60 min. Notably, it was found that the Ge-Sb-Se-based chalcogenide glass sealed the MS ZnS substrates well. After the MS ZnS substrates were sealed with chalcogenide glass, they showed a transmission of 55 % over 3~12 μm. The tensile strength of the sealed MS ZnS substrates with Ge-Sb-Se-based chalcogenide glass was analyzed by applying a maximum load of about 240 N, confirming its suitability as a sealing material in the far infrared range.

A method of functionalization of multi-walled carbon nanotube (MWNT) at room temperature using dry ozone gas is described. The resulting MWNT were characterized by Fourier transform infrared, x-ray photoelectron spectroscopy, and scanning electron microscopy. Combined to these analyses and solubility in liquids, it could be concluded that the dry ozone gas exposure introduces polar functional groups such as carboxylic groups to MWNT similar to acidic modification of MWNT. Particularly, the stable dispersion of MWNT in water after ozone treatment above a critical level could be obtained, implying potential bio-application. The hydrophilic functional groups on the MWNT introduced by ozone oxidation were helpful in improving the interaction with functional groups in PA6 such as -NH2 and -CONH- resulting in improved mechanical properties.

H2S adsorption characteristics of adsorbent made by coffee waste were investigated. The manufacturing method of adsorbent is to activate the coffee waste with steam after carbonization of dried coffee waste. For analyses of the manufactured adsorbent, various methods such as scanning electron microscope (SEM), measurements of BET(Brunauer Emmett Teller) surface area, pH, and Iodide adsorption were adopted. As major adsorption characteristics, adsorption equilibrium capacity was measured by using a batch type experimental apparatus for operating variables such as adsorption temperature (25~45℃), adsorbent types. The experimental result showed that the H2S adsorption equilibrium capacity of adsorbent made by coffee waste much more increases with steam activation for the coffee waste.