Light-switchable anchors on magnetized biomorphic microcarriers

Abstract

Combining silica-biomorphs, magnetite mesocrystals and covalently bound spiropyrans into light-switchable microcarriers.

Self-Assembled Faceted Mesocrystals: Advances in Optimization of Growth Conditions

“…Literature suggests that these mesocrystals form in dispersion by a homogeneous nucleation event that precedes the mesocrystals’ growth and then eventually drop on a silicon substrate. , However, this statement is debatable for the systems where the formation of mesocrystals occurs in the presence of a substrate and with low driving forces of the crystallization process. Beyond the fundamental research, nowadays studies on mesocrystals also focus on using mesocrystals for specific applications such as microswimmers, ,, conductors, gas sensors, , and photocatalysis . Such applications often demand highly ordered, faceted mesocrystals with large and/or defined sizes.…”

“…To optimize mesocrystal formation from oleic acid stabilized iron oxide nanoparticles, the key role of additives such as oleic acid, oleyl amine, and dioctyl ether must be considered. Mesocrystal formation often only succeeds after the addition of such molecular additives independent of the formation procedure and technique. ,, Figure presents the influence of additives on mesocrystal formation. Without additives, spherical agglomerates with disordered rough surfaces form (Figure a and Figure S7a, batch III, THF, ethanol).…”

Computational assessment of the potential of cross-catalytic coprecipitating systems for the bottom-up design of nanocomposites

“…28,29 Silica-witherite biomorphs could thus reveal highly useful for the design of new optical devices or microcarriers. [30][31][32] In general, we dene here this type of system as a Cross-Catalytic Coprecipitating System (abbreviated in the following as CCCS). CCCSs consist in two parallel precipitation reactions, forming two distinct condensed phases, that catalyze each other (Fig.…”

Electrocarboxylation of Spiropyran Switches through Carbon‐Bromide Bond Cleavage Reaction

“…For most of these applications, the photoswitchable molecules must be covalently attached to the final materials, such as polymers, [19–21] nanoparticles, [22,23] biomacromolecules [24,25] and surfaces, [26,27] which requires the introduction of suitable groups in spiropyrans to ensure chemical functionalization. Carboxylic acid groups are amongst the most preferred for this purpose, as they confer molecules with a broad reactivity that enables the covalent bonding to substrates by simple coupling reactions (e. g., amide bond formation) [26,28,29] . However, the incorporation of carboxylic acids in spiropyrans is not straightforward, typically involves several synthetic steps (e. g., condensation of an aromatic aldehyde with enamine indole) and moderate yields [30–32] …”

“…Carboxylic acid groups are amongst the most preferred for this purpose, as they confer molecules with a broad reactivity that enables the covalent bonding to substrates by simple coupling reactions (e. g., amide bond formation). [26,28,29] However, the incorporation of carboxylic acids in spiropyrans is not straightforward, typically involves several synthetic steps (e. g., condensation of an aromatic aldehyde with enamine indole) and moderate yields. [30][31][32] Actually, the chemical synthesis of carboxylic acids and their derivatives (e. g., esters or amides) imply the use of many reagents, catalysts [33] or organolithium compounds [34] at mild or strong conditions.…”