Abe, Yuichiro; Savikhin, Victoria; Yin, Jun; Grimsdale, Andrew C.; Soci, Cesare; Toney, Michael F.; Lam, Yeng Ming
Unique Reversible Crystal-to-Crystal Phase Transition—Structural and Functional Properties of Fused Ladder Thienoarenes
Donor–acceptor type molecules based on fused ladder thienoarenes, indacenodithiophene (IDT), and dithienocyclopenta–thienothiophene (DTCTT), coupled with benzothiadiazole, are prepared, and their solid-state structures are investigated. They display a rich variety of solid phases ranging from amorphous glass states to crystalline states, upon changes in the central aromatic core and side group…
Unusual Interfacial Freezing Phenomena in Hexacontane/Silica Composites
Gao, Xia; Su, Yunlan; Zhao, Weiwei; Qian, Qingyun; Chen, Xin; Wittenbrink, Robert; Wang, Dujin
The crystallization behaviors of n-hexacontane (C60H122)/Stöber silica (SiO2) composites with various compositions were investigated by a combination of differential scanning calorimetry (DSC), solid-state 13C nuclear magnetic resonance (solid-state 13C NMR), and proton NMR relaxation experiments. By means of DSC, C60H122 molecules in C60H122/silica composites were observed to be involved in…
Uranium Extraction by a Bifunctional Amido-Phosphonic Acid: Coordination Structure and Aggregation
Pecheur, Olivia; Guillaumont, Dominique; Dourdain, Sandrine; Berthon, Laurence; Turgis, Raphael; Fillaux, Clara; Arrachart, Guilhem; Testard, Fabienne
Butyl-N,N-di(2-ethylhexyl)carbamoyl-nonylphosphonate (DEHCNPB) is a new amido-phosphonic acid bifunctional ligand with a high uranium extraction efficiency from wet phosphoric acid. In the present work, the DEHCNPB coordination structure toward uranium and its aggregation properties have been fully characterized using experimental and theoretical approaches. DEHCNPB forms associated species, and…
Use of micrometric latex beads to improve the porosity of hydroxyapatite obtained by chemical coprecipitation method
Webler, G. D.; Rodrigues, W. C.; Silva, A. E. S.; Silva, A. O. S.; Fonseca, E. J. S.; Degenhardt, M. F. S.; Oliveira, C. L. P.; Otubo, L.; Barros Filho, D. A.
Hydroxyapatite is one of the most important biomaterials whose application mainly extends to implants and drug delivery. This work will discuss the changes in the pore size distribution of hydroxyapatite when there are latex beads present during the synthesis. These changes were monitored using different techniques: small angle X-ray scattering,…
Using the M13 Phage as a Biotemplate to Create Mesoporous Structures Decorated with Gold and Platinum Nanoparticles
Vera-Robles, L. Irais; González-Gracida, Jaqueline; Hernández-Gordillo, Armin; Campero, Antonio
By taking advantage of the physical and chemical properties of the M13 bacteriophage, we have used this virus to synthesize mesoporous silica structures. Major coat protein p8 was chemically modified by attaching thiol groups. As we show, the resulting thiolated phage can be used as a biotemplate able to direct…
Water solubilization capacity of pharmaceutical microemulsions based on Peceol®, lecithin and ethanol
Mouri, Abdelkader; Diat, Olivier; Lerner, Dan Alain; Ghzaoui, Abdeslam El; Ajovalasit, Alessia; Dorandeu, Christophe; Maurel, Jean-Claude; Devoisselle, Jean-Marie; Legrand, Philippe
Biocompatible microemulsions composed of Peceol®, lecithin, ethanol and water developed for encapsulation of hydrophilic drugs were investigated. The binary mixture Peceol®/ethanol was studied first. It was shown that the addition of ethanol to pure Peceol® has a significant fluidifying and disordering effect on the Peceol® supramolecular structure with an enhancement…
α-Lactalbumin and sodium dodecyl sulfate aggregates: Denaturation, complex formation and time stability
Sun, Yang; Oseliero Filho, Pedro L.; Oliveira, Cristiano L. P.
We have combined isothermal titration calorimetry (ITC), spectroscopy and small-angle X-ray scattering (SAXS) to describe the denaturation process of bovine α-lactalbumin (BLA) induced by sodium dodecyl sulfate (SDS). As presented in the article, in the initial binding step, association of ∼6 SDS molecules with one protein molecule leads to a…
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)…
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…
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…