Bargain, François; Thuau, Damien; Panine, Pierre; Hadziioannou, Georges; Domingues Dos Santos, Fabrice; Tencé-Girault, Sylvie
Thermal behavior of poly(VDF-ter-TrFE-ter-CTFE) copolymers: Influence of CTFE termonomer on the crystal-crystal transitions
Depending on their CTFE content (from 0 to 10 mol %), poly (VDF-ter-TrFE-ter-CTFE), poly(vinylidene fluoride-ter-trifluoroethylene-ter-chlorotrifluoroethylene) copolymers exhibit ferroelectric (FE) or relaxor ferroelectric (RFE) properties at low temperature whereas they all present paraelectric (PE) behavior at high temperature. This thermal evolution of their electro-active properties is…
New Insights into the Growth Mechanism of Ultrathin Au Nanowires from Combined in Situ EXAFS and SAXS Studies
Pschunder, Fernando; Puig, Julieta; Giovanetti, Lisandro J.; Huck-Iriart, Cristián; Requejo, Félix G.; Buceta, David; Hoppe, Cristina E.; Ramallo-López, José M.
The synthesis of Au nanowires (NWs) in hexane solution of HAuCl4·3H2O, oleylamine and triisopropylsilane at room temperature was “in situ” monitored by means of X-ray absorption fine structure spectroscopies and small-angle X-ray scattering to determine, under identical synthesis conditions, both the changes in the oxidation state of gold atoms and…
Factors controlling the structure of syndiotactic polystyrene upon the guest exchange and guest extraction processes
Shaiju, P.; Bhoje Gowd, E.
The role of host preparation method on the structural phase transition of syndiotactic polystyrene (sPS) after the guest exchange process has been thoroughly investigated in our previous study using a series of n-alkanes . In addition to the host preparation method, we have found that guest molecules used for the…
Influences of Compression on the Mechanical Behavior and Electrochemical Performances of Separators for Lithium Ion Batteries
Yu, Yansong; Xiong, Bijin; Zeng, Fangxinyu; Xu, Ruizhang; Yang, Feng; Kang, Jian; Xiang, Ming; Li, Lu; Sheng, Xingyue; Hao, Zengheng
Compression stress on thickness direction of separators exists in assembling and operation of all lithium ion batteries (LIBs). In this study, influences of compression on microporous morphologies, electrolyte uptake behavior, and electrochemical properties of three types of commercial separators (PP-U, PP-B, and PE-B) for LIBs manufactured via different processes, were…
Functionally Active Membrane Proteins Incorporated in Mesostructured Silica Films
Jahnke, Justin P.; Idso, Matthew N.; Hussain, Sunyia; Junk, Matthias J. N.; Fisher, Julia M.; Phan, David D.; Han, Songi; Chmelka, Bradley F.
A versatile synthetic protocol is reported that allows high concentrations of functionally active membrane proteins to be incorporated in mesostructured silica materials. Judicious selections of solvent, surfactant, silica precursor species, and synthesis conditions enable membrane proteins to be stabilized in solution and during subsequent coassembly into silica–surfactant composites with nano-…
Preparation and Properties of High-performance Polyimide Copolymer Fibers Derived from 5-Amino-2-(2-hydroxy-5-aminobenzene)-benzoxazole
Dai, Xue-Min; Gao, Hong; Zhang, Ran; Du, Zhi-Jun; Shi, Tong-Fei; Ji, Xiang-Ling; Qiu, Xue-Peng; Men, Yong-Feng
A series of polyamic acid copolymers (co-PAAs) with para-hydroxyl groups was synthesized using two diamine monomers, namely p-phenylenediamine (p-PDA) and 5-amino-2-(2-hydroxy-5-aminobenzene)-benzoxazole (m-pHBOA), of different molar ratios through copolymerization with 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA) in N,N-dimethyacetamine (DMAc). The co-PAA solutions were used to fabricate…
On-demand tuned hazard free elastomeric composites: A green approach
Manoharan, Partheban; Das, Narayan Chandra; Naskar, Kinsuk
Rising ecological concerns and depletion of the potentially harmful environmental impacts caused by rubber products, are of prime importance in the industry. Therefore, implementation of sustainable greener materials is required to minimize the detrimental influences. In this research, we investigated the beneficial influence of naturally derived bio-resin toward the effects…
Stretching Temperature Dependency of Lamellar Thickness in Stress-Induced Localized Melting and Recrystallized Polybutene-1
Wang, Yaotao; Jiang, Zhiyong; Fu, Lianlian; Lu, Ying; Men, Yongfeng
The structural parameters such as long spacing and thicknesses of crystalline lamellae and amorphous layers of polybutene-1 crystallized from quiescent melt at different isothermal temperatures and established by tensile stretching the isothermally crystallized samples at different temperatures via a stress induced localized melting and recrystallization process were determined by small-angle…
Self-assembly and mechanochromic luminescence switching of trifluoromethyl substituted 1,3,4-oxadiazole derivatives
Ongungal, Rahul M.; Sivadas, Aneesh P.; Kumar, N. S. Saleesh; Menon, Sajith; Das, Suresh
The synthesis, self-assembly and mechanochromic properties of a series of oxadiazole derivatives (TFOXD1, TFOXD4, TFOXD6 and TFOXD8) substituted with a dialkoxy stilbene and trifluoromethyl benzene moieties are reported. All the derivatives formed stable gels in aliphatic solvents and with the exception of TFOXD1 exhibited monotropic liquid crystalline behavior. The photophysical…
Effect of diamond nanoparticle chains on rheological properties of hydrosol
Kuznetsov, N. M.; Belousov, S. I.; Stolyarova, D. Yu.; Bakirov, A. V.; Chvalun, S. N.; Shvidchenko, A. V.; Eidelman, E. D.; Vul’, A. Ya.
We have recently shown that the sol-gel transition occurs in hydrosol of detonation nanodiamond (DND) particles with size of 4–5 nm. Here we study properties of the hydrosol. Namely, we study the dependence of dynamic viscosity and shear stress on DND concentrations. Dynamic light scattering (DLS) and small-angle X-ray scattering (SAXS)…