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Vera Obradović,Dušica B. Stojanović,Ivona Janković Častvan,Vesna Radojević,Petar S. Uskoković 한국섬유공학회 2018 Fibers and polymers Vol.19 No.9
The aim of this study was to fabricate a new kind of hybrid fabric composites with the cross-linked electrospun poly(vinyl butyral) (PVB) composite nanofibres. The experiments were performed with the 10 wt.% PVB/ethanol solution for electrospinning where the modified silica nanoparticles (mSiO2), the oxidised single-walled carbon nanotubes (o- SWCNT) and the o-SWCNT/mSiO2 hybrid nanoparticles were added to the solution. The electrospun fibres were crosslinked with glutaraldehyde (GA) afterwards in order to reinforce the composite structure by bonding to the p-aramid fabrics. The chemical and thermo-mechanical properties of the hybrid fabric composites were evaluated. The greatest improvement in thermo-mechanical properties was achieved by the sample which contained the cross-linked PVB fibres with the o- SWCNT/mSiO2 hybrid nanoparticles.
Novel Composite Layer Based on Electrospun Polymer Nanofibers for Efficient Light Scattering
Lee, Hyun Jun,An, Seongpil,Hwang, Ju Hyun,Jung, Sun-Gyu,Jo, Hong Seok,Kim, Kyu Nyun,Shim, Yong Sub,Park, Cheol Hwee,Yoon, Sam S.,Park, Young Wook,Ju, Byeong-Kwon American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.1
<P>We fabricated a PAN (polyacrylonitrile) NF (nanofiber)-embedded composite layer to adjust the light-control layer in light-emitting-diode (LED) and organic-light-emitting-diode (OLED) lighting systems with unique optical characteristics, for effective light scattering. The newly designed light-control composite layers with a composition of PAN NF/SU-8 exhibited a change in the optical properties, which was identified by the diameter control of the NF using a simple process. The change in the optical properties was largely dependent on the embedded NF’s features. Therefore, the NF can be applied in different types of lighting systems, depending on each lighting device’s purpose.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2015/aamick.2015.7.issue-1/am5075387/production/images/medium/am-2014-075387_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am5075387'>ACS Electronic Supporting Info</A></P>
Joshi, Mahesh Kumar,Tiwari, Arjun Prasad,Maharjan, Bikendra,Won, Ko Sung,Kim, Han Joo,Park, Chan Hee,Kim, Cheol Sang Elsevier 2016 Carbohydrate polymers Vol.147 No.-
<P><B>Abstract</B></P> <P>The aim of the present study is to develop a facile, efficient approach to reinforce nylon 6 (N6) nanofibers with cellulose chains as well as to study the effect that cellulose regeneration has on the physicochemical properties of the composite fibers. Here, a cellulose acetate (CA) solution (17wt%) was prepared in formic acid and was blended with N6 solution (20%, prepared in formic acid and acetic acid) in various proportions, and the blended solutions were then electrospun to produce hybrid N6/CA nanofibers. Cellulose was regenerated in-situ in the fiber via alkaline saponification of the CA content of the hybrid fiber, leading to cellulose-reinforced N6 (N6/CL) nanofibers. Electron microscopy studies suggest that the fiber diameter and hence pore size gradually decreases as the mass composition of CA increases in the electrospinning solution. Cellulose regeneration showed noticeable change in the polymorphic behavior of N6, as observed in the XRD and IR spectra. The strong interaction of the hydroxyl group of cellulose with amide group of N6, mainly via hydrogen bonding, has a pronounced effect on the polymorphic behavior of N6. The γ-phase was dominant in pristine N6 and N6/CA fibers while α- phase was dominant in the N6/CL fibers. The surface wettability, wicking properties, and the tensile stress were greatly improved for N6/CL fibers compared to the corresponding N6/CA hybrid fibers. Results of DSC/TGA revealed that N6/CL fibers were more thermally stable than pristine N6 and N6/CA nanofibers. Furthermore, regeneration of cellulose chain improved the ability to nucleate bioactive calcium phosphate crystals in a simulated body fluid solution.</P> <P><B>Highlights</B></P> <P> <UL> <LI> N6/CL composite fibers were obtained via electrospinning and deacetylation. </LI> <LI> Fiber diameter and pore size controlled varying the composition of component polymers. </LI> <LI> N6/CL composite fiber were more thermally stable than pristine N6 and N6/CA fibers. </LI> <LI> Wicking rate was pronouncedly enhanced due to cellulose regeneration. </LI> <LI> Tensile properties and biomimetic mineralization were improved. </LI> </UL> </P>
Lee, Young-Woo,Kim, Da-Mi,Kim, Si-Jin,Kim, Min-Cheol,Choe, Hui-Seon,Lee, Kyu-Ho,Sohn, Jung Inn,Cha, Seung Nam,Kim, Jong Min,Park, Kyung-Won American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.11
<P>While active materials based on germanium (Ge) are considered as a promising alternative anodic electrode due to their relatively high reversible capacity and excellent lithium-ion diffusivity) the quite unstable structural/electrochemical stability and severe volume expansion or pulverization problems of Ge electrodes remain a considerable challenge in lithium ion batteries (LIBs). Here, we present the development of Ge embedded in one-dimensional carbon nanostructures (Ge/CNs) synthesized by the modified in situ electrospinning technique using a mixed electrospun solution consisting of a Ge precursor as an active material source and polyacrylonitrile (PAN) as a carbon source. The as-prepared Ge/CNs exhibit superior lithium ion behavior properties, i.e., highly reversible specific capacity, rate performance, Li ion diffusion coefficient, and superior cyclic stability (capacity retention: 85% at 200 mA g(-1)) during Li alloying/dealloying processes. These properties are due to the high electrical conductivity and unique structures containing well-embedded Ge nanoparticles (NPs) and a one-dimensional carbon nanostructure as a buffer medium, which is related to the volume expansion of Ge NPs. Thus, it is expected that the Ge/CNs can be utilized as a promising alternative anodic material in LIBs.</P>