Doblado-Maldonado, Andrés F.; Gomand, Sara V.; Goderis, Bart; Delcour, Jan A.
The extent of maize starch crystal melting as a critical factor in the isolation of amylose via aqueous leaching
Aqueous leaching from granular maize starch is a common technique for amylose (AM) isolation. Leaching was studied in a 60–90 °C temperature range. The leachate yield, degree of polymerization (DP) and purity were related to the extent of melting of the starch crystals at the leaching temperature as determined via differential…
Thermally conductive thin films derived from defect free graphene-natural rubber latex nanocomposite: Preparation and properties
George, Gejo; Sisupal, Suja Bhargavan; Tomy, Teenu; Pottammal, Bincy Akkoli; Kumaran, Alaganandam; Suvekbala, Vemparthan; Gopimohan, Rajmohan; Sivaram, Swaminathan; Ragupathy, Lakshminarayanan
Commercially useful rubber products viz. gloves, condoms, tyres, and rubber hoses used in high temperature environments, etc., require efficient thermal conductivity, which increases the lifetime of these products. Graphene can fetch this property, if it is effectively incorporated into the rubber matrix. The great challenge in preparing graphene-rubber nanocomposites is…
Thermal-Induced Denaturation and Aggregation Behavior of Lysozyme and Bovine Serum Albumin: a Thermodynamic and Structural Study
Perez, Aline Sanches; Oliveira, Cristiano Luis Pinto
Solution studies permit a direct investigation of the particles on a well-defined environment. Fluorescence, circular dichroism, scattering, and calorimetry provide, individually, very important information among the protein structure, overall shape, and thermodynamic equilibrium. In this work, a combination of these techniques is presented for the study of denaturation induced by…
Thermotropic Phase Behavior of Choline Soaps
Klein, Regina; Dutton, Helen; Diat, Olivier; Tiddy, Gordon J. T.; Kunz, Werner
Choline carboxylates (ChCm with m = 12−18) are simple biocompatible anionic surfactants with very low Krafft temperatures, possessing a rich aqueous phase behavior. In the present work, we have investigated the thermotropic mesomorphism of anhydrous ChCm salts for m = 12−18. Transition temperatures and enthalpies determined by differential scanning calorimetry…
Theoretical and experimental study of isothiazolinone adsorption onto ordered mesoporous silica
Mardones, Lucas E.; Legnoverde, María Soledad; Simonetti, Sandra; Basaldella, Elena I.
Mesoporous silica SBA-15 particles were synthesized in order to evaluate their effectiveness as encapsulating agents for a commercial biocide composed of a mixture of methylisothiazolinone and chloromethylisothiazolinone (MIT/CMIT). Three powdered samples of silica particles having different textural properties, sizes and morphologies were hydrothermally obtained and then characterized by SEM,…
The structure evolution of polyamide 1212 after stretched at different temperatures and its correlation with mechanical properties
Cai, Ziqing; Liu, Xiaoyi; Zhou, Qiong; Wang, Yaotao; Zhu, Caizhen; Xiao, Xueliang; Fang, Dong; Bao, Haifeng
The development of polyamide fibers with excellent mechanical performance is always a hot research topic. In this paper, the structure evolution of polyamide 1212 (PA1212) after stretching at different temperatures was characterized by Wide-Angle X-ray Diffraction (WAXD) and Small-Angle X-ray Scattering (SAXS) techniques. Experimentally, it was found that there existed…
Thermal shrinkage and microscopic shutdown mechanism of polypropylene separator for lithium-ion battery: In-situ ultra-small angle X-ray scattering study
Xiong, Bijin; Chen, Ran; Zeng, Fangxinyu; Kang, Jian; Men, Yongfeng
Structural variation and shutdown behavior of polypropylene separator for lithium-ion batteries upon heating have been investigated via in-situ ultra-small angle X-ray scattering (USAXS) tests. Structural parameters including porosity, specific interface and pore size have been successfully estimated by fitting the scattering intensity with craze model. The fitting results reveal that…
Study of Iron-Bearing Dolomite Dissolution at Various Temperatures: Evidence for the Formation of Secondary Nanocrystalline Iron-Rich Phases on the Dolomite Surface
Debure, Mathieu; Andreazza, Pascal; Canizarès, Aurélien; Grangeon, Sylvain; Lerouge, Catherine; Mack, Paul; Madé, Benoît; Simon, Patrick; Veron, Emmanuel; Warmont, Fabienne; Vayer, Marylène
We investigated the dissolution of a natural Fe-containing dolomite under acidic conditions (pH 3–5.5) with atomic force microscopy (AFM) at 20 °C and with batch dissolution experiments at 80 °C. Dolomite dissolution proceeded by two identified mechanisms: removal of dolomite layers through spreading and coalescence of etch pits nucleated at…
The Template Determines Whether Chemically Identical Nanoparticle Scaffolds Show Elastic Recovery or Plastic Failure
Suresh, Karthika; Patil, Shivprasad; Ramanpillai Rajamohanan, Pattuparambil; Kumaraswamy, Guruswamy
Subtle variations in the preparation of ice-templated nanoparticle assemblies yield monoliths that are chemically identical but exhibit qualitatively different mechanical behavior. We ice template aqueous dispersions to prepare macroporous monoliths largely comprising silica nanoparticles held together by a crosslinked polymer mesh. When the polymer is crosslinked in the presence of…
TNF Induced Switching of Columnar Rectangular to Hexagonal Assemblies in a New Class of Triphenylene-Based Room Temperature Discotic Liquid Crystals
Gupta, Monika; Gupta, Santosh Prasad; Pal, Santanu Kumar
A straightforward synthesis of triphenylene-based oligomeric systems that self-organize into room temperature columnar structures is presented. The compounds with longer spacer length (m = 10 and 12) exhibit columnar rectangular (Colr) mesophase whereas the compound with m = 8 exists in glassy Colr state. Interestingly, the Colr self-assembly of these…