Samadi Khoshkhoo, Mahdi; Maiti, Santanu; Schreiber, Frank; Chassé, Thomas; Scheele, Marcus
Surface Functionalization with Copper Tetraaminophthalocyanine Enables Efficient Charge Transport in Indium Tin Oxide Nanocrystal Thin Films
Macroscopic superlattices of tin-doped indium oxide (ITO) nanocrystals (NCs) are prepared by self-assembly at the air/liquid interface followed by simultaneous ligand exchange with the organic semiconductor copper 4,4′,4″,4‴-tetraaminophthalocyanine (Cu4APc). By using X-ray photoelectron spectroscopy (XPS), grazing-incidence small-angle X-ray scattering (GISAXS), and…
Surfactant-free microemulsion electrokinetic chromatography (SF-MEEKC) with UV and MS detection – a novel approach for the separation and ESI-MS detection of neutral compounds
Mohorič, Urška; Beutner, Andrea; Krickl, Sebastian; Touraud, Didier; Kunz, Werner; Matysik, Frank-Michael
Microemulsion electrokinetic chromatography (MEEKC) is a powerful tool to separate neutral species based on differences in their hydrophobic and hydrophilic properties. However, as a major drawback the conventionally used SDS based microemulsions are not compatible with electrospray ionization mass spectrometry (ESI-MS). In this work, a surfactant-free microemulsion (SFME) consisting of…
Synergistic enhancement of crystallization and mechanical performance of polypropylene random copolymer by strong shear and β-nucleating agent
Qi, Yanxin; Zhang, Chunbo; Zhao, Ying; Wang, Dujin; Lei, Jun; Li, Zhongming
Investigation of microstructure and properties is critical for the development and application of polymer materials. Polypropylene random copolymer (PPR) and β-nucleated PPR are widely used in water pipe production. The effect of melt shear flow on the crystalline structure and mechanical properties of PPR containing β-nucleating agent needs in-depth understanding.…
Synthesis and characterization of tungstophosphoric acid-modified mesoporous silica nanoparticles with tuneable diameter and pore size distribution
Sosa, Alexis A.; Gorsd, Marina N.; Blanco, Mirta N.; Pizzio, Luis R.
Mesoporous silica nanoparticles were prepared in aqueous/organic phase using cetyltrimethylammonium bromide and polystyrene as organic templates. The morphology and crystalline phase of the products were characterized by scanning electron microcopy, transmission electron microscopy, X-ray diffraction, small angle X-ray scattering, and N2 adsorption/desorption isotherm analysis. The octane/water…
Synthesis and self-assembly of low χ block copolymers with large periodicity
Breaux, Caleb L.; Henderson, Clifford L.; Li, Haibo; Li, Bing; Neisser, Mark
Journal of Vacuum Science & Technology B, 2017, vol 35, 6, pp. 06GI02DOI:10.1116/1.4991874Visit the full articleBack to the overview
Syndiotactic Polystyrene/Hybrid Silica Spheres of POSS Siloxane Composites Exhibiting Ultralow Dielectric Constant
Joseph, Angel Mary; Nagendra, Baku; Surendran, K. P.; Bhoje Gowd, E.
Homogeneously dispersed hybrid silica/syndiotactic polystyrene composites were investigated for low-κ dielectric applications. The composites were prepared by a solution blending method, and their microstructures were analyzed by SEM, TEM, and AFM. Crystallization and phase transformation behavior of sPS were investigated using differential scanning calorimetry and wide-angle X-ray diffraction.…
Crystallization Temperature Dependence of Cavitation and Plastic Flow in the Tensile Deformation of Poly(ε-caprolactone)
Jiang, Zhiyong; Chen, Ran; Lu, Ying; Whiteside, Ben; Coates, Phil; Wu, Zhonghua; Men, Yongfeng
In situ small-, ultrasmall-, and wide-angle X-ray scattering measurements were performed to investigate the structural evolution of crystalline lamellae and cavities as a function of deformation ratio during tensile deformation of isothermally crystallized poly(ε-caprolactone). The cavities were modeled as cylinder-shaped objects which are oriented along the stretching direction and randomly…
Tensile Deformation of Oriented Poly(ε-caprolactone) and Its Miscible Blends with Poly(vinyl methyl ether)
Jiang, Zhiyong; Wang, Yaotao; Fu, Lianlian; Whiteside, Ben; Wyborn, John; Norris, Keith; Wu, Zhonghua; Coates, Phil; Men, Yongfeng
The structural evolution of micromolded poly(ε-caprolactone) (PCL) and its miscible blends with noncrystallizable poly(vinyl methyl ether) (PVME) at the nanoscale was investigated as a function of deformation ratio and blend composition using in situ synchrotron small-angle X-ray scattering (SAXS) and scanning SAXS techniques. It was found that the deformation mechanism…
Tensile modulus enhancement and mechanism of polyimide fibers by post-thermal treatment induced microvoid evolution
Yi, Xiaolin; Gao, Yunyun; Zhang, Mengying; Zhang, Chunbo; Wang, Qiao; Liu, Guoming; Dong, Xia; Wu, Dezhen; Men, Yongfeng; Wang, Dujin
The correlation between mechanical property and the microstructure of two-step wet spinning polyimide (PI) fibers after thermal annealing was investigated. In-situ wide-angle X-ray diffraction (WAXD) and ex-situ small angle X-ray scattering (SAXS) methods were utilized to study the liquid crystal-like structure orientation and microvoids structure (the length and the orientation…
The effect of chitin nanocrystal on the structural transition of shish-kebab to fibrillar crystals of ultra-high molecular weight polyethylene/chitin nanocrystal fibers during hot-stretching process
An, Minfang; Xu, Haojun; Lv, You; Tian, Feng; Gu, Qun; Wang, Zongbao
The pre-stretched ultra-high molecular weight polyethylene/chitin nanocrystal composite fibers after first hot-stretching stage were prepared. The effect of chitin nanocrystal on the structural evolution of shish-kebab to fibrillar crystals of ultra-high molecular weight polyethylene/chitin nanocrystal fibers during hot-stretching process was studied by using in-situ small-angle X-ray scattering,…