TY - JOUR
T1 - Effect of aspartic acid and glycine on calcite growth
AU - Montanari, G.
AU - Lakshtanov, L.Z.
AU - Tobler, D.J.
AU - Dideriksen, K.
AU - Dalby, K.N.
AU - Bovet, N.
AU - Stipp, S.L.S.
N1 - Funding Information:
The work was supported by funding from the European Commission for the MINSC project, a Marie Curie Initial Training Network, Grant Agreement No: FP7-290040, and the UK Engineering and Physical Sciences Research Council (EPSRC grant number EP/I001514/1), which funds the Materials Interface with Biology (MIB) Consor
Publisher Copyright:
© 2016 American Chemical Society.
PY - 2016/9/7
Y1 - 2016/9/7
N2 - Organic molecules control calcite growth and crystal morphology, influence biomineralization processes, and offer clues for optimizing antiscalants for industry. Here we quantified the effect of amino acid monomers, aspartic acid (Asp1), and glycine (Gly1), and their polymers (Aspn, Asp5, and Gly5), on calcite growth rate, in a constant composition setup. Asp1 and its polymers inhibit growth, with rate decreasing as amino acid chain length increases. For 2 mM Asp1, fractional inhibition (FI, where 1 represents complete inhibition) was 0.54; for 0.0012 mM Aspn, FI = 0.94. Gly1 and Gly5 only marginally affect growth (-0.1 < FI < 0.1); indeed, they slightly promote growth at most tested concentrations. Fitting of adsorption isotherms (Langmuir, Langmuir-Freundlich, Flory-Huggins) confirmed that Asp polymers adsorb strongly, explaining their strong control on calcite growth, but Gly1 and Asp1 adsorb less due to competition with carbonate ions. ΔGads (Aspn) = -39 kJ/mol; ΔGads (Asp5) = -50 kJ/mol; ΔGads (Asp1) = -21 kJ/mol; and ΔGads (Gly1) = -22 kJ/mol. The morphology was equally affected. Crystal edges became rougher, and corners, more rounded. Overall, the number of carboxyl groups and length of the carbon chain correlated with the lowest growth rate.
AB - Organic molecules control calcite growth and crystal morphology, influence biomineralization processes, and offer clues for optimizing antiscalants for industry. Here we quantified the effect of amino acid monomers, aspartic acid (Asp1), and glycine (Gly1), and their polymers (Aspn, Asp5, and Gly5), on calcite growth rate, in a constant composition setup. Asp1 and its polymers inhibit growth, with rate decreasing as amino acid chain length increases. For 2 mM Asp1, fractional inhibition (FI, where 1 represents complete inhibition) was 0.54; for 0.0012 mM Aspn, FI = 0.94. Gly1 and Gly5 only marginally affect growth (-0.1 < FI < 0.1); indeed, they slightly promote growth at most tested concentrations. Fitting of adsorption isotherms (Langmuir, Langmuir-Freundlich, Flory-Huggins) confirmed that Asp polymers adsorb strongly, explaining their strong control on calcite growth, but Gly1 and Asp1 adsorb less due to competition with carbonate ions. ΔGads (Aspn) = -39 kJ/mol; ΔGads (Asp5) = -50 kJ/mol; ΔGads (Asp1) = -21 kJ/mol; and ΔGads (Gly1) = -22 kJ/mol. The morphology was equally affected. Crystal edges became rougher, and corners, more rounded. Overall, the number of carboxyl groups and length of the carbon chain correlated with the lowest growth rate.
UR - http://www.scopus.com/inward/record.url?scp=84986193773&partnerID=8YFLogxK
U2 - 10.1021/acs.cgd.5b01635
DO - 10.1021/acs.cgd.5b01635
M3 - Article
AN - SCOPUS:84986193773
SN - 1528-7483
VL - 16
SP - 4813
EP - 4821
JO - Crystal Growth and Design
JF - Crystal Growth and Design
IS - 9
ER -