Nanocrystal gel networks {can be|may be|could be|might be|is often|is usually} responsive, tunable {materials|supplies|components}, but deliberately designing their structure and controlling their properties {have been|happen to be|have already been} {challenging|difficult}. By employing reversibly bonded molecular linkers, gelation {can be|may be|could be|might be|is often|is usually} realized {under|below|beneath} {conditions|circumstances|situations} predicted by thermodynamics. But, simulations have {offered|provided|supplied|presented} the only microscopic insights, with no experimental {means|indicates|implies|signifies|suggests} to monitor linking {leading|top|major} to gelation. {Here|Right here}, we introduce a metal coordination linkage {with a|having a|using a} distinct optical signature {allowing|permitting|enabling} us to quantify linking in situ and establish the structural and thermodynamic basis for assembly. {Due to|Because of|As a result of|On account of|Resulting from|As a consequence of} coupling {between|in between|among|amongst|involving} linked indium tin oxide nanocrystals, their infrared absorption shifts abruptly at a chemically tunable gelation temperature. We quantify bonding spectroscopically and use molecular dynamics simulations {to understand|to know} bonding motifs as a function of temperature, revealing that gel formation is governed by reaching a {critical|crucial|vital|essential|important} {number|quantity} of {effective|efficient|successful|powerful|productive|helpful} {links|hyperlinks} that extend the nanocrystal network. Microscopic insights from our colorimetric linking chemistry {enable|allow} switchable gels {based|primarily based} on equilibrium thermodynamic principles, opening the door to rational {design|style|design and style} of programmable nanocrystal net-work assemblies. Chloroiridic acid Order 109705-14-8 site PMID:24318587
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