Screw dislocation-induced pyramidal crystallization of dendron-like macromolecules featuring asymmetric geometry

Abstract

We report the dendron-shaped macromolecules ABn crystallize into well-ordered pyramid-like structures from mixed solvents, instead of spherical motifs with curved structures as found in bulk. The design of the asymmetric...

Precise Self-assembly of Janus Pyramid Heteroclusters into Core-Corona Nanodots and Nanodot Supracrystals: Implications for the Construction of Virus-like Particles and Nanomaterials

“…The self-assembly was conducted by acetone evaporation in an acetone/ n -decane solution with a ratio of 60/40 (v/v) and different initial concentrations (0.2–24.0 mg/mL) (Figure S5). Notably, this system is different from the tetrahydrofuran/water system used in a previous work . We used high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) to observe self-assembled nanostructures in the samples prepared by dropping the solution on a copper mesh coated with a carbon film.…”

“…In the past decade, a strategy was proposed to construct nanotubes, mesoscale honeycombs, and complex superstructures of Janus heteroclusters following the lipid assembly principle. − Herein, we will further exploit this principle to design and synthesize a Janus pyramid heterocluster. The new candidate can self-assemble into nanodots with a core-corona heterostructure, which finally morph into nanodot supracrystals.…”

Study on the formation mechanism of asymmetric growth hillocks on pyramidal faces of KDP crystals

“…3 A screw dislocation originating from a crystal lattice defect forms non-vanishing steps. 4,5 The steps wind themselves in a spiral when the crystal grows under a supersaturated environment. As a result, a growth hillock appears and spreads out across the pyramidal face causing the growth of a crystal.…”

Crystallization of Precise Side-Chain Giant Molecules with Tunable Sequences and Functionalities

“…17,32−36 crystallization of POSS-based dendron-like macromolecules. 33 The authors used a one-and-half sandwiched molecular packing model to fit the unbalanced macromolecular shape.…”

“…To the best of our knowledge, the crystallization of a precise giant molecule chain was rarely investigated in the literature, and little was known about the crystal structure and formation mechanism. In spite of this, some hints can be found in the crystallization studies of molecules or polydisperse polymers that contain a certain species of giant monomers. ,− For example, Liu and co-workers reported screw-dislocation-induced pyramidal crystallization of POSS-based dendron-like macromolecules . The authors used a one-and-half sandwiched molecular packing model to fit the unbalanced macromolecular shape.…”