Weiber, E. Annika; Jannasch, Patric
Anion-conducting polysulfone membranes containing hexa-imidazolium functionalized biphenyl units
Poly(arylene ether sulfone)s containing randomly distributed biphenyl units tethered with precisely six imidazolium cations are designed and prepared with the aim to facilitate ionic clustering and conductivity of anion exchange membranes (AEMs). A series of statistical copolymers with different cationic contents are synthesized via K2CO3-mediated polycondensations of…
High temperature annealing for structural optimization of silica aerogels in solar thermal applications
Strobach, Elise; Bhatia, Bikram; Yang, Sungwoo; Zhao, Lin; Wang, Evelyn N.
Optically transparent, thermally insulating monolithic silica aerogel, with its high solar transmittance and low thermal conductivity, is well-suited for solar thermal applications, particularly concentrated solar power systems. The properties of silica aerogel are directly determined by the structure of the highly porous, interconnected silica network. By using high temperature annealing…
UV-Induced Synthesis and Stabilization of Surfactant-Free Colloidal Pt Nanoparticles with Controlled Particle Size in Ethylene Glycol
Kacenauskaite, Laura; Quinson, Jonathan; Schultz, Hannibal; Kirkensgaard, Jacob Judas Kain; Kunz, Sebastian; Vosch, Tom; Arenz, Matthias
The conventional temperature-induced polyol synthesis of platinum nanoparticles is a powerful and well-established method for the preparation of stable, surfactant-free platinum nanoparticles (Pt NPs) with controlled shape, size and size distribution. Recently, we reported that exposure to daylight leads to the formation of Pt NPs from precursor solutions, suggesting that…
Plant-crafted starches for bioplastics production
Sagnelli, Domenico; Hebelstrup, Kim H.; Leroy, Eric; Rolland-Sabaté, Agnès; Guilois, Sophie; Kirkensgaard, Jacob J. K.; Mortensen, Kell; Lourdin, Denis; Blennow, Andreas
Transgenically-produced amylose-only (AO) starch was used to manufacture bioplastic prototypes. Extruded starch samples were tested for crystal residues, elasticity, glass transition temperature, mechanical properties, molecular mass and microstructure. The AO starch granule crystallinity was both of the B- and Vh-type, while the isogenic control starch was mainly A-type. The first…
Overcoming the Thermal Instability of Efficient Polymer Solar Cells by Employing Novel Fullerene-Based Acceptors
Zhang, Chaohong; Mumyatov, Alexander; Langner, Stefan; Perea, José Darío; Kassar, Thaer; Min, Jie; Ke, Lili; Chen, Haiwei; Gerasimov, Kirill L.; Anokhin, Denis V.; others
Advanced Energy Materials, 2016, DOI:Visit the full articleBack to the overview
Synthesis Mechanism and Influence of Light on Unprotected Platinum Nanoparticles Synthesis at Room Temperature
Kacenauskaite, Laura; Swane, Andreas Abildgaard; Kirkensgaard, Jacob Judas Kain; Fleige, Michael; Kunz, Sebastian; Vosch, Tom; Arenz, Matthias
In this Communication we present an investigation of the influence of light on the formation of platinum (Pt) nanoparticles (NPs) using standard polyol synthesis reagents at room temperature. It is demonstrated that instead of thermal treatment, UV light can be used for particle formation thus opening new pathways for the…
Abnormal strong burn-in degradation of highly efficient polymer solar cells caused by spinodal donor-acceptor demixing
Li, Ning; Perea, José Darío; Kassar, Thaer; Richter, Moses; Heumueller, Thomas; Matt, Gebhard J.; Hou, Yi; Güldal, Nusret S.; Chen, Haiwei; Chen, Shi; Langner, Stefan; Berlinghof, Marvin; Unruh, Tobias; Brabec, Christoph J.
The performance of organic solar cells is determined by the delicate, meticulously optimized bulk-heterojunction microstructure, which consists of finely mixed and relatively separated donor/acceptor regions. Here we demonstrate an abnormal strong burn-in degradation in highly efficient polymer solar cells caused by spinodal demixing of the donor and acceptor phases, which…
Composition and structure of high temperature dairy fouling
Hagsten, Carin; Altskär, Annika; Gustafsson, Stefan; Lorén, Niklas; Hamberg, Lars; Innings, Fredrik; Paulsson, Marie; Nylander, Tommy
The fouling structure and composition is dependent on the product, but also on the heating process applied to it. The structure will have profound effect on the cleaning process and the down time in the production plant. Here, the structure of high temperature (137 °C) milk fouling has been investigated,…
Effect of hydration and dehydration on the properties of SBA-15 layer studied by humidity scanning QCM-D
Znamenskaya, Yana; Björklund, Sebastian; Kocherbitov, Vitaly; Alfredsson, Viveka
Surface deposited layers of mesoporous silica particles could function as support for bio-sensing or drug release applications. It is crucial to control the surface deposition process and employ relevant techniques to characterize the properties of the particles on the surface. Here, we deposit SBA-15 particles on native silica or cationic…
Reversibly Actuating Solid Janus Polymeric Fibers
Ionov, Leonid; Stoychev, Georgi; Jehnichen, Dieter; Sommer, Jens Uwe
It is commonly assumed that the substantial element of reversibly actuating soft polymeric materials is chemical cross-linking, which is needed to provide elasticity required for the reversible actuation. On the example of melt spun and three-dimensional printed Janus fibers, we demonstrate here for the first time that cross-linking is not…