A fluorous sodium l-prolinate derivative as low molecular weight gelator for perfluorocarbons

Abstract

The fluorous sodium l-prolinate 1 self-assembles in perfluorocarbons to form a three-dimensional network of left-handed nano-helices resulting in solvent gelation.

Manipulating the Self‐Assembly of Multicomponent Low Molecular Weight Gelators (LMWGs) through Molecular Design

“…The vials were 1 dram with a diameter of 15 mm and the heating block was a 15 mm vial block with 20 slots. 1 H and 13 C NMR spectra were recorded on a Bruker AV III HD 400 MHz spectrometer at the UBC High Resolution NMR Spectroscopy Facility. Mass spectrometry was performed on a Waters ZQ mass spectrometer equipped with an ESCI ion source at the UBC Chemistry Mass Spectrometry Facility.…”

“…Amino acids have been used as a key design component in creating LMWGs due to their biocompatibility, ease of derivatization, and availability as single enantiomers. These attractive features have led to the development of a variety of amino acid‐based LMWG families [13] …”

“…[12] LMWGs self-assemble into fibrillar networks, creating an entanglement that immobilizes the solvent. [13] These dynamic materials have emerged in a wide variety of applications including optoelectronics, cell growth, drug delivery and catalysis. [14][15][16][17][18][19][20] Although single-component LMWG systems have been explored for decades, an increasing number of recent studies are combining unique gelators to create multicomponent systems.…”

“…These attractive features have led to the development of a variety of amino acid-based LMWG families. [13] We recently reported studies using amino acid-derived organogels, which have shown promise for oil spill remediation and optical applications. [46,47] Here, we use the previous gelator design as the basis to synthesize a series of 12 molecules containing three different amino acid-derived headgroups and four different alkyl chain lengths.…”

Time-resolved rheometry of drying liquids and suspensions

“…Specifically, after placing the sample in a parallelplate geometry connected to a stress-controlled rheometer, we arXiv:2101.04553v1 [cond-mat.soft] 12 Jan 2021 use a zero normal-force (ZNF) protocol, in which the normal force exerted on the sample is maintained equal to zero, while the gap height is free to adjust. This method, which was previously shown to be efficient in measuring rheological properties during non-isochoric gelation in agarose dispersions 25,26 and organogels 27 , is employed here on Newtonian fluids and charged colloidal suspensions. We show that the ZNF protocol allows us to monitor the continuous increase in viscosity of a dehydrating water-glycerol mixture, as well as the discontinuous changes in viscoelastic properties of a drying colloidal suspension during its glass transition.…”