Mechanical Strength of Amorphous CaCO₃ Colloidal Spheres

Abstract

Amorphous glassy CaCO3 colloidal spheres of monomodal size distribution were studied by high-resolution Brillouin light scattering. The Young modulus of 37 GPa and shear modulus of 14 GPa of glassy CaCO3 at a density of 1.9 g/cm3 were extracted from the particle vibration frequencies by employing acoustic wave scattering cross-section calculations. The line shape of the low-frequency modes is a sensitive index of the particle polydispersity.

Tailoring the shape of amorphous nanomaterials: recent developments and applications

“…Spherical structure is also favorable in terms of surface energy. Nanospheres are the most reported shape of amorphous materials in the last decade (see Table 1), and they can be composed of calcium carbonate (CaCO 3 ) [43][44][45][46][47], silicon (Si) [48][49][50][51][52], metals or their compounds [53][54][55][56][57][58][59][60][61]. CaCO 3 is abundant in the natural world, and a typical model system used to mimic the mineralization process of biominerals [43].…”

“…Because of their complex internal structure, the growth of amorphous nanomaterial is usually ruleless, resulting in irregular particles using solution approaches or thin films using deposition techniques as their conventional shape. Over the last decade, inorganic amorphous nanomaterials with a variety of novel shapes, with notable examples including spheres, wires, tubes, fibers, cubes, octahedra, polyhedra, flower-like spheres and arrays, which are summarized in spheres (hollow) CaCO 3 gas-diffusion solution method [43] spheres CaCO 3 solution method [44] spheres CaCO 3 solution method [45] spheres CaCO 3 solution method [46] spheres CaCO 3 solution method [47] spheres Si thermal decomposition [48] spheres Si solution method [49] spheres Si/Ti solution method [50] spheres Si:H thermal decomposition [51] spheres Si:H thermal decomposition [52] spheres Se solution method [53] spheres TiO 2 solution method [54][55][56] spheres (hollow) PbO-TiO 2 sol-gel method [57] spheres Co-B alloy solution method [58] spheres 2 solution method [80] nanoboxes Ni(OH) 2 solution method [81] nanocubes (hollow) Co(OH) 2 solution method [82] nanopolyhedra (hollow) CoS solution method [83] mesopores nanocubes ZnSnO 3 solution method and annealing [84] REVIEWS SCIENCE CHINA Materials Table 1, have been synthesized. In this review, we explain how these exquisite nanostructures can be obtained by a number of innovative methods.…”

Revealing the Design Principles of High‐Performance Biological Composites Using Ab initio and Multiscale Simulations: The Example of Lobster Cuticle

“…[16] The properties of biological ACC are not known exactly and are assumed to be equal to those of synthetic ACC spherules, for which the experimentally measured Young modulus and Poisson ratio have been reported to be 37 GPa and 0.35, respectively. [40] The unknown properties of the proteins in the mineral-protein matrix (Fig. 2IVb) have been fixed after tuning the model predictions to the experimental data, with Young's modulus and Poisson's ratio identified as 1.0 GPa and 0.46, respectively.…”

High Frequency Acoustics in Colloid-Based Meso- and Nanostructures by Spontaneous Brillouin Light Scattering

“…These are the Poisson ratio σ, the Young modulus E, and the shear modulus G (section 2.1.1). [96] Additionally to the elastic constants, even more information can be extracted from these spectra. The peculiar line shape can be regarded as a sensitive index of the particle size distribution.…”

“…An application with technological relevance was the determination of the mechanical properties of spherical glassy CaCO 3 -particles. [96] The particles with mono-modal size distribution and diameters in the range between 400 nm and 1500 nm were made from amorphous CaCO 3 , with unknown elastic properties as yet. Eigenmode acoustic spectra of the spheres were recorded and six or seven resonance modes could be resolved.…”