Morphology control by flow-driven self-organizing precipitation

Influence of microscopic precipitate structures on macroscopic pattern formation in reactive flows in a confined geometry

“…There are several larger crystals (E15 mm) either of rhombohedral or spherical (multicrystalline) shape most probably corresponding to calcite and vaterite polymorphs of calcium carbonate. 7 The larger crystals are surrounded by regions where very fine particles are present in high number density. Their particle size cannot be precisely determined by the optical microscope due to the resolution limit.…”

“…Flow conditions have recently been shown to be able to affect the yield of precipitation reactions 1,2 as well as the spatiotemporal distribution of the solid phase produced. [1][2][3][4][5][6][7][8][9] Experiments consisting of injecting a solution of a given reactant of a precipitation reaction into a confined geometry containing a solution of the other reactant have indeed made it possible to show that, depending on the concentrations of the chemicals and the injection flow rate, various precipitation patterns can be obtained. The resulting structures depend not only on the cohesion of the solid phase produced by the reaction but also on possible hydrodynamic instabilities.…”

Osmotic contribution to the flow-driven tube formation of copper–phosphate and copper–silicate chemical gardens

“…17 It was also shown that either polymorph or crystallite type selection may be achieved by applying a simple flow-injection technique even without the usage of any additives, which draws the attention of materials science. [18][19][20] Furthermore, the selection of appropriate conditions (type of reactants, concentration, flow rate, etc.) can result in selfsustainable precipitate tubes that are stable against time even after drying.…”

Kalciumiontartalmú csapadékok mintázatképződése

“…Kísérleteimet egy 24,2 cm × 24,2 cm méretű, négyzet alapú, 5,0 cm magas üvegedényben végeztem [114][115][116], melyet 250 cm 3 térfogatú nátrium-karbonát vagy nátrium-oxalát-oldattal töltöttem fel. A négyzet alapú edény alján középre egy lyukat fúrtunk, melyet szilikonragasztóval lezártam.…”