Liu, Yang; Zhao, Jia; He, Fang; Zheng, Chen; Lei, Qi; Zhao, Xiaopeng; Yin, Jianbo
Ion transport, polarization and electro-responsive elelctrorheological effect of self-crosslinked poly(ionic liquid)s with different counterions
Self-crosslinked bis(imidazolium)-based poly(ionic liquid)s (PILs) containing different counterions (P, X = BF4−, PF6−, TfO−, TFSI−) are synthesized and the influence of counterions on electro-responsive electrorheological (ER) effect is studied in order to understand the structure-property relationship of crosslinked PIL-based ER system. It is found that the size and type of…
3D-Printing of Pure Metal–Organic Framework Monoliths
Lim, Gwendolyn J. H.; Wu, Yue; Shah, Bhuvan B.; Koh, J. Justin; Liu, Connie K.; Zhao, Dan; Cheetham, Anthony K.; Wang, John; Ding, Jun
Metal–organic frameworks (MOFs) are usually synthesized in powder form. For many practical applications, MOFs need to be shaped into monoliths that can be easily handled. However, conventional shaping methods, such as pelletization, often result in a decrease in functionality. Recently, MOF-containing monoliths have been made using direct ink writing (DIW;…
Morphology and ionic conductivity relationship in silk/cellulose biocomposites
Blessing, Bailey; Trout, Cory; Morales, Abneris; Rybacki, Karleena; Love, Stacy A.; Lamoureux, Guillaume; O’Malley, Sean M.; Hu, Xiao; Cruz, David Salas-de la
The relationship between morphology and the ionic conductivity of polysaccharide–protein bio-electrolyte membranes is explored in this study. Structural proteins and polysaccharides form hydrophobic and electrostatic interactions, and the resulting matrices can exhibit novel and useful properties. However, transforming these natural biomacromolecules from their native state to a more usable form…
Effect of Irradiation and Detection of Long-Lived Polyenyl Radicals in Highly Crystalline Ultra-High Molar Mass Polyethylene (UHMMPE) Fibers
Forster, Amanda L.; Tsinas, Zois; Al-Sheikhly, Mohamad
To improve properties such as thermal conductivity, low temperature thermal strain, and creep resistance of ultra-high molar mass polyethylene (UHMMPE) fibers, several researchers have previously undertaken efforts to crosslink these fibers using radiation. Ionizing radiation is commonly used to crosslink bulk UHMMPE in other applications, such as artificial joints. However,…
Millimeter-Scale Unipolar Transport in High Sensitivity Organic–Inorganic Semiconductor X-ray Detectors
Jayawardena, K. D. G. Imalka; Thirimanne, Hashini M.; Tedde, Sandro Francesco; Huerdler, Judith E.; Parnell, Andrew J.; Bandara, R. M. Indrachapa; Mills, Christopher A.; Silva, S. Ravi P.
Hybrid inorganic-in-organic semiconductors are an attractive class of materials for optoelectronic applications. Traditionally, the thicknesses of organic semiconductors are kept below 1 μm due to poor charge transport in such systems. However, recent work suggests that charge carriers in such organic semiconductors can be transported over centimeter length scales opposing…
Hierarchical Sticker and Sticky Chain Dynamics in Self-Healing Butyl Rubber Ionomers
Mordvinkin, Anton; Suckow, Marcus; Böhme, Frank; Colby, Ralph H.; Creton, Costantino; Saalwächter, Kay
We present a detailed comparison of the microscopic dynamics and the macroscopic mechanical behavior of novel butyl rubber ionomers with tunable dynamics of sparse sticky imidazole-based sidegroups that form clusters of about 20 units separated by essentially unperturbed chains. This material platform shows promise for application as self-healing elastomers. Size…
Core-crystalline nanoribbons of controlled length via diffusion-limited colloid aggregation
Schmarsow, Ruth N.; Ceolín, Marcelo; Zucchi, Ileana A.; Schroeder, Walter F.
It has been previously reported that poly(ethylene) (PE)-based block copolymers self-assemble in certain thermosetting matrices to form a dispersion of one-dimensional (1D) nanoribbons. Such materials exhibit exceptional properties that originate from the high aspect ratio of the elongated nano-objects. However, the ability to prepare 1D assemblies with well-controlled dimensions is…
Isothermal and non-isothermal cold crystallization of tetrabenzofluorene (TBF) molecules
Boopathi, A. A.; Sampath, Srinivasan; Narasimhaswamy, T.
Design and synthesis of tetrabenzofluorene (TBF) derivatives are carried out to investigate the isothermal and non-isothermal cold crystallization (CC) behavior by various spectroscopic and analytical techniques. The unprecedented CC exhibited by TBF molecules is examined by systematic modification of alkyl chain length (C8–C18 even carbons) on both sides of the…
Block copolymers as bile salt sequestrants: intriguing structures formed in a mixture of an oppositely charged amphiphilic block copolymer and bile salt
Schillén, Karin; Galantini, Luciano; Du, Guanqun; Del Giudice, Alessandra; Alfredsson, Viveka; Carnerup, Anna M.; Pavel, Nicolae V.; Masci, Giancarlo; Nyström, Bo
To study the formation and characterize the structure of mixed complexes of oppositely charged block copolymers and surfactants are of great significance for practical applications, e.g., in drug carrier formulations that are based on electrostatically assisted assembly. In this context, biocompatible block copolymers and biosurfactants (like bile salts) are particularly…
Organic acids interacting with block copolymers have broadened the window that retains isoporous structures
Zhu, Guo-Dong; Yin, Yu-Rong; Li, Zhen-Nan; Qiu, Ya-Yu; Yi, Zhuan; Gao, Cong-Jie
Evaporation is significantly important for the preparation of isoporous membranes from self-assembly and non-solvent induced phase separation (SNIPS). Unfortunately, the time of solvent evaporation that retains isoporous structures is usually rather short, which causes many challenges to fabricate membranes with repeatable and controllable isoporous structures. In the current work, we…