Haware, Rahul V.; Vinjamuri, Bhavani Prasad; Sarkar, Amrita; Stefik, Morgan; Stagner, William C.
Deciphering magnesium stearate thermotropic behavior
Magnesium stearate (MgSt) is the most commonly used excipient for oral solid dosage forms, yet there is significant commercial physicochemical variability that can lead to variable performance of critical product attributes. Differential scanning calorimetry (DSC) is often used as a quality control tool to characterize MgSt, but little data is…
Onset of Osmotic Swelling in Highly Charged Clay Minerals
Daab, Matthias; Eichstaedt, Natalie J.; Habel, Christoph; Rosenfeldt, Sabine; Kalo, Hussein; Schießling, Hubert; Förster, Stephan; Breu, Josef
Delamination by osmotic swelling of layered materials is generally thought to become increasingly difficult, if not impossible, with increasing layer charge density because of strong Coulomb interactions. Nevertheless, for the class of 2:1 layered silicates, very few examples of delaminating organo-vermiculites were reported in literature. We propose a mechanism for…
Chiral Transmission to Cationic Polycobaltocenes over Multiple Length Scales Using Anionic Surfactants
Musgrave, Rebecca A.; Choi, Paul; Harniman, Robert L.; Richardson, Robert M.; Shen, Chengshuo; Whittell, George R.; Crassous, Jeanne; Qiu, Huibin; Manners, Ian
Chiral polymers are ubiquitous in nature, and the self-assembly of chiral materials is a field of widespread interest. In this paper, we describe the formation of chiral metallopolymers based on poly(cobaltoceniumethylene) (n+), which have been prepared through oxidation of poly(cobaltocenylethylene) (PCE) in the presence of enantiopure N-acyl-amino-acid-derived anionic surfactants, such…
Tuning the mechanical properties of alginate–peptide hydrogels
Ochbaum, Guy; Davidovich-Pinhas, Maya; Bitton, Ronit
Alginate, a polysaccharide that gels in the presence of divalent ions, has been used in the field of regenerative medicine to facilitate cell growth in impaired tissues by providing an artificial bio-surrounding similar to the natural extra cellular matrix (ECM). Here, we present a systematic investigation of the effect of…
Expanded Kinetic Control for Persistent Micelle Templates with Solvent Selection
Sarkar, Amrita; Evans, Laurel; Stefik, Morgan
The precision control of nanoscale materials remains a challenge for the study of nanostructure–performance relationships. Persistent micelle templates (PMT) are a kinetic-controlled self-assembly approach that decouples pore and wall control. Here, block copolymer surfactants form persistent micelles that maintain constant template size as material precursors are added, despite the shifting…
Scalable Synthesis of Hierarchical Antimony/Carbon Micro-/Nanohybrid Lithium/Sodium-Ion Battery Anodes Based on Dimethacrylate Monomer
Liang, Su-Zhe; Wang, Xiao-Yan; Xia, Yong-Gao; Xia, Sen-Lin; Metwalli, Ezzeldin; Qiu, Bao; Ji, Qing; Yin, Shan-Shan; Xie, Shuang; Fang, Kai; Zheng, Lu-Yao; Wang, Mei-Mei; Zuo, Xiu-Xia; Li, Ru-Jiang; Liu, Zhao-Ping; Zhu, Jin; Müller-Buschbaum, Peter; Cheng, Ya-Jun
A facile scalable synthesis of hierarchical Sb/C micro-/nanohybrid has been addressed in this work, which possesses the advantages of both micrometer and nanometer scale structures as lithium-ion battery anode. Difunctional methacrylate monomers are used as solvent and carbon source as well. Liquid precursor of antimony(III) n-butoxide is dissolved in the…
2D matrix engineering for homogeneous quantum dot coupling in photovoltaic solids
Xu, Jixian; Voznyy, Oleksandr; Liu, Mengxia; Kirmani, Ahmad R.; Walters, Grant; Munir, Rahim; Abdelsamie, Maged; Proppe, Andrew H.; Sarkar, Amrita; Arquer, F. Pelayo García de; Wei, Mingyang; Sun, Bin; Liu, Min; Ouellette, Olivier; Quintero-Bermudez, Rafael; Li, Jie; Fan, James; Quan, Lina; Todorovic, Petar; Tan, Hairen; Hoogland, Sjoerd; Kelley, Shana O.; Stefik, Morgan; Amassian, Aram; Sargent, Edward H.
A new matrix engineering strategy enables improvements of CQD solar cell efficiency via considerable enhancement of the photocarrier diffusion…
Viscoelastic properties and reinforcement of non-aggregated and aggregated nanocomposites
Pirner, Daniela; Dulle, Martin; Förster, Stephan
We investigate the properties of polymer nanocomposites consisting of narrow disperse spherical nanoparticles that are coated with narrow disperse polymers. These nanoparticles can be homogeneously dispersed in a polymer matrix. The structure of the polymer-coated nanoparticles was examined by using small angle X-ray scattering (SAXS) and transmission electron microscopy (TEM),…
Structure of the Crystalline Core of Fiber-like Polythiophene Block Copolymer Micelles
Hayward, Dominic W.; Lunn, David J.; Seddon, Annela; Finnegan, John R.; Gould, Oliver E. C.; Magdysyuk, Oxana; Manners, Ian; Whittell, George R.; Richardson, Robert M.
The internal structure and cross-sectional geometry of fiber-like poly(3-hexylthiophene)-based block copolymer micelles has been determined using small- and wide-angle X-ray scattering (SAXS and WAXS, respectively) techniques alongside electron and atomic force microscopies. WAXS of concentrated micellar solutions demonstrated that the block copolymers form crystalline-core micelles in solvents…
Hydrogelation Kinetics Measured in a Microfluidic Device with in Situ X-ray and Fluorescence Detection
Seibt, Susanne; With, Sebastian; Bernet, Andreas; Schmidt, Hans-Werner; Förster, Stephan
Efficient hydrogelators will gel water fast and at low concentrations. Small molecule gelling agents that assemble into fibers and fiber networks are particularly effective hydrogelators. Whereas it is straightforward to determine their critical concentration for hydrogelation, the kinetics of hydrogelation is more difficult to study because it is often very…