Shaiju, P.; Murthy, N. Sanjeeva; Gowd, E. Bhoje
Molecular, Crystalline, and Lamellar Length-Scale Changes in the Poly(l-lactide) (PLLA) during Cyclopentanone (CPO) Desorption in PLLA/CPO Cocrystals
Polymer–solvent complexes, poly(l-lactide) (PLLA) with cyclopentanone (CPO), were studied at multiple length scales using differential scanning calorimetry, small-angle neutron scattering, Fourier transform infrared spectroscopy, and temperature-dependent wide- and small-angle X-ray scattering. PLLA crystallizes in the ε form when organic solvents such as CPO are incorporated into the crystal…
Molecular relaxation and dynamic rheology of “cluster phase”-free ionomers based on lanthanum(III)-neutralized low-carboxylated poly(methyl methacrylate)
Zhang, Lina; Qiu, Biwei; Song, Yihu; Zheng, Qiang
Molecular dynamics and linear dynamic rheology of La(III)-neutralized low-carboxylated poly(methyl methacrylate) (PMMA) ionomers with varying neutralization levels are investigated. While the ionomers do not form a clear cluster phase, increasing neutralization level causes notable retardation of the α relaxation and elevation of glass transition temperature. In addition, dynamic rheology of…
Multilamellar Thermoresponsive Emulsions Stabilized with Biocompatible Semicrystalline Block Copolymers
Manova, Anna; Viktorova, Jekaterina; Köhler, Jens; Theiler, Stefan; Keul, Helmut; Piryazev, Alexey A.; Ivanov, Dimitri A.; Tsarkova, Larisa; Möller, Martin
We demonstrate specific interface-templated crystallization behavior of biocompatible amphiphilic poly(ethylene oxide)-b-poly(ε-caprolactone) (PEO-b-PCL) block copolymers enabling triggered shaping of the curvature of the oil/water interface and controlled phase inversion, including the formation of stable multiple emulsions. Water-born anisotropic micelles of PEO-b-PCL block copolymers…
Multiwalled carbon nanotube promotes crystallisation while preserving co-continuous phase morphology of polycarbonate/polypropylene blend
Mohammed Arif, P.; Sarathchandran, C.; Narayanan, Aravinda; Saiter, Allisson; Terzano, Roberto; Allegretta, Ignazio; Porfido, Carlo; Kalarikkal, Nandakkumar; Thomas, Sabu
The influence of multiwalled carbon nanotubes (MWCNTs) on phase morphology, lamellar structure, thermal stability, melting behaviour and isothermal crystallisation kinetics of polycarbonate/polypropylene (PC/PP) blend nanocomposites has been investigated. Both neat blends and PC/PP (60/40)/MWCNT nanocomposites were prepared by melt mixing method. Morphological analyses were performed by…
Nanoscale Structure of Urethane/Urea Elastomeric Films
Reis, Dennys; Trindade, Ana C.; Godinho, Maria Helena; Silva, Laura C.; do Carmo Gonçalves, Maria; Neto, Antônio M. Figueiredo
The nanostructure of urethane/urea elastomeric membranes was investigated by small-angle X-ray scattering (SAXS) in order to establish relationships between their structure and mechanical properties. The networks were made up of polypropylene oxide (PPO) and polybutadiene (PB) segments. The structural differences were investigated in two types of membranes with the same…
Naphtho[1,2-b:5,6-b′]dithiophene Based Two-Dimensional Conjugated Polymers for Highly Efficient Thick-Film Inverted Polymer Solar Cells
Zhu, Xiangwei; Fang, Jin; Lu, Kun; Zhang, Jianqi; Zhu, Lingyun; Zhao, Yifan; Shuai, Zhigang; Wei, Zhixiang
Two-dimensional conjugated zigzag naphthodithiophene was used for construction of novel polymer photovoltaic materials. Two novel copolymers based on zigzag naphthodithiophene and alkylthienopyrrole-4,6-dione inserted with different alkyl substituted thiophene as bridges have been designed and synthesized (PzNDTT-TPD1 and PzNDTT-TPD2, respectively). The best power conversion efficiency of…
Naphtho[1,2-b:5,6-b′]dithiophene-Based Small Molecules for Thick-Film Organic Solar Cells with High Fill Factors
Zhu, Xiangwei; Xia, Benzheng; Lu, Kun; Li, Huan; Zhou, Ruimin; Zhang, Jianqi; Zhang, Yajie; Shuai, Zhigang; Wei, Zhixiang
Two novel acceptor–donor–acceptor type small molecules based on a two-dimensional conjugated naphthodithiophene (NDT) unit containing alkylthienyl or alkylphenyl side chains, named as NDTT-CNCOO and NDTP-CNCOO, respectively, were designed and synthesized. Compared with NDTT-CNCOO, NDTP-CNCOO-based bulk heterojunction (BHJ) solar cells exhibited higher fill factors, higher short…
Nanostructured antigen-responsive hydrogels based on peptides for leishmaniasis detection
Souza, Sivoney F.; Silva, Emerson R.; Alves, Wendel A.
Journal of the Brazilian Chemical Society, 2017, vol 28, 9, pp. 1619–1629 DOI: Back to the overview
Nanostructured SBA-15 silica: An effective protective vehicle to oral hepatitis B vaccine immunization
Scaramuzzi, Karina; Tanaka, Gabriela D.; Neto, Francisco Mariano; Garcia, Paulo R. A. F.; Gabrili, Joel J. M.; Oliveira, Denise C. A.; Tambourgi, Denise V.; Mussalem, Juliana S.; Paixão-Cavalcante, Danielle; D’Azeredo Orlando, Marcos T.; Botosso, Viviane F.; Oliveira, Cristiano L. P.; Fantini, Márcia C. A.; Sant’Anna, Osvaldo A.
Due to its physicochemical properties, nanostructured mesoporous SBA-15 silica shows great potential as a vaccine adjuvant. This study evaluated the capacity of SBA-15 to encapsulate/adsorb the recombinant purified HBsAg from the Hepatitis B virus and the immunoresponsiveness of mice orally immunized with HBsAg inside SBA-15. A simulation of small angle…
New Insight into the Chemical Nature of the Plasmonic Nanostructures Synthesized by the Reduction of Au(III) with Sulfide Species
Huergo, M. A.; Giovanetti, L.; Moreno, M. S.; Maier, C. M.; Requejo, F. G.; Salvarezza, R. C.; Vericat, C.
We have studied the products of the controversial synthesis of HAuCl4 with Na2S, which include gold nanostructures (Au NSs) that absorb in the near-infrared (NIR) region and are highly promising for photothermal therapies and other nanomedical applications. From high-resolution transmission electron microscopy, X-ray absorption spectroscopy, and small-angle X-ray scattering, we…