Sono-assembly of nanostructures via tyrosine–tyrosine coupling reactions at the interface of acoustic cavitation bubbles

Abstract

The reactive and oscillating surface of cavitation microbubbles acts as a catalytic binding site for the coupling of amphiphilic biomolecules.

Sound-driven dissipative self-assembly of aromatic biomolecules into functional nanoparticles

“…To investigate the ability of ultrasound to induce tryptophan oxidation, dimerization and subsequently DSA of tryptophan dimers, an aqueous solution of tryptophan (1 mg/mL, 4.9 mM, pH 5) was sonicated up to 5 h using ultrasonic frequency and power of 355 kHz and 2 W/cm 2 , respectively (see ESI Experimental Section). We selected 355 kHz for our experiments because this is an optimal frequency to generate the required amount of OH radicals 14 . For instance in our experimental set up, we evaluated that after 1 h sonication 1 mM OH radicals are generated (see ESI, Experimental Section).…”

“…1a. We recently reported that the oscillating surface of acoustic cavitation microbubbles acts as a reactive and catalytic site for the C-C coupling of amphiphilic moieties 14 . In this study, hydroxylated tryptophan species and hydroxylated tryptophan dimers, hereafter referred to as dTrp, were formed on the bubbles Please do not adjust margins Please do not adjust margins surface (Step 1 - Fig.…”

“…Based on the diffusion coefficient of the amino acids (700-1000 µm 2 /s) and dTrp (870±78 µm 2 /s) which was measured by fluorescence correlation spectroscopy (ESI Fig. S7), 14,18 this is likely a sufficient time for both Trp and dTrp molecules to diffuse, adsorb, dimerize and further aggregate during the bubbles collapse. First, the tryptophan molecules will be adsorbed at the bubble surface (Step 1- Fig.1a) to form hydroxylated and dimeric species mediated by bubbles collapse and generated OH radicals.…”

Ultrasound and Sonochemistry for Radical Polymerization: Sound Synthesis

“…[15,27] For example, in ah omogeneous liquid the cavitation bubble will contain vapor from both the solventa sw ell as any volatile dissolved reagent. The reactive radical speciesf ormed by cavitation events can subsequently be used for radical-radical coupling, [28][29][30] radical addition, [29] and radicalp olymerization reactions. [31][32] Additionally, dissolved speciesi nt he immediate vicinity of the collapsing bubble subjected to strongs hear forces as ar esult of the microjets of liquid rushing to fill the bubble can activate certain compounds or molecules to exert am echanochemical response, withs everal classes of mechano-active catalysts having emergeda su seful reagents for driving chemical transformations under the applicationofforce, or mechanical energy.…”

Functionalization of silk fabric using hyperbranched polymer coated attapulgite nanoparticles for prospective UV-resistance and antibacterial applications

“…Although applied in various fields of nanocomposite materials, wastewater treatment and pigments, application of ATP in fabrics, especially silk fabrics, has been rarely reported, especially to silk fabrics till now. In these papers, there is a common point that ultrasonic vibration is more effective and feasible method to fabricate ATP NPs, thus leading to the dispersion of NPs [19][20][21].…”