A5015218389- Calcium Carbonate Crystallization and Inhibition
- Bone Tissue Engineering Materials
- Paleontology and Stratigraphy of Fossils
- Crystallization and Solubility Studies
- Cephalopods and Marine Biology
- Surface Modification and Superhydrophobicity
- X-ray Diffraction in Crystallography
- Adhesion, Friction, and Surface Interactions
- Semiconductor materials and devices
- Nanoporous metals and alloys
- Advanced Photocatalysis Techniques
- Electronic and Structural Properties of Oxides
- Nanocluster Synthesis and Applications
- Pickering emulsions and particle stabilization
- Quantum Dots Synthesis And Properties
- Electrocatalysts for Energy Conversion
- Advanced Sensor and Energy Harvesting Materials
- Perovskite Materials and Applications
- Clay minerals and soil interactions
- ZnO doping and properties
- Building materials and conservation
- Copper-based nanomaterials and applications
- Crystallography and molecular interactions
- Coral and Marine Ecosystems Studies
- Plant and Biological Electrophysiology Studies
Technion – Israel Institute of Technology
2016-2025
University of Haifa
2007-2021
Ospedale San Giacomo Apostolo
2019
University of Bologna
2019
Israel Institute
2015
Harvard University
2007-2011
Harvard University Press
2009-2011
Max Planck Institute of Colloids and Interfaces
2010
Weizmann Institute of Science
2008
European Synchrotron Radiation Facility
2007
Mesoscale hierarchical helical structures with diverse functions are abundant in nature. Here we show how spontaneous helicity can be induced a synthetic polymeric nanobristle assembling an evaporating liquid. We use simple theoretical model to characterize the geometry, stiffness, and surface properties of pillars that favor adhesive self-organization bundles wound around each other. The process controlled yield highly ordered clusters unique structural hierarchy arises from sequential...
Most of the world’s bacteria exist in robust, sessile communities known as biofilms, ubiquitously adherent to environmental surfaces from ocean floors human teeth and notoriously resistant antimicrobial agents. We report surprising observation that Bacillus subtilis biofilm colonies pellicles are extremely nonwetting, greatly surpassing repellency Teflon toward water lower surface tension liquids. The remains nonwetting against up 80% ethanol well other organic solvents commercial biocides...
Hydrous CaCO 3 gets a new structure Calcium carbonate (CaCO ) forms important minerals on Earth and is model system for understanding crystal nucleation. Three different structures of are known, along with two that hydrated. Zou et al. found third hydrated formed from amorphous in the presence magnesium ions. The discovery illustrates importance precursors producing materials. Science , this issue p. 396
Bio-inspired, multifunctional, high-aspect-ratio nanostructured surfaces are fabricated in a variety of materials with controlled geometry and stiffness. A soft-lithography method that allows the one-to-one replication nanostructures renders it possible to produce arbitrary cross-sectional shapes, orientations, 2D lattices different from original master is presented. The actuation posts demonstrated.
Calcite, aragonite, and vaterite are the three anhydrous polymorphs of calcium carbonate, in order decreasing thermodynamic stability. Although is not commonly found geological settings, it an important precursor several carbonate-forming systems can be biological settings. Because difficulties obtaining large, pure, single crystals, crystal structure has been elusive for almost a century. Using aberration-corrected high-resolution transmission electron microscopy, we that actually composed...
Abstract Organisms have the ability to produce structures with superior characteristics as in course of biomineralization. One most intriguing biominerals is existence intracrystalline macromolecules. Despite several studies over last two decades and efforts mimic incoporation macromolecules synthetically, a fundamental understanding mechanism incorporation yet lacking. For example, which common 20 amino acids are really responsible for interaction mineral phase? Here reductionist approach,...
Many roads to being tough A number of routes exist increase toughness in both natural and human-made materials—for example, using secondary phases precipitates or exploiting tailored architectures shaped crystals. Polishchuk et al. detail the nanoscale internal structure calcitic microlenses formed by a brittlestar (see Perspective Duffy). The segregation magnesium-rich particles forms phase that places compressive stresses on host matrix. This toughening mechanism resembles Guinier-Preston...
Crystal structures of four new coumarin polymorphs were solved by crystal structure prediction method and their lattice free energies calculated advanced techniques.
Living organisms display a spectrum of wondrous colors, which can be produced by pigmentation, structural coloration, or combination the two. A relatively well-studied system, produces colors via an array alternating anhydrous guanine crystals and cytoplasm, is responsible for metallic luster many fish. The structure biogenic was so far believed to same as that synthetic one, monoclinic polymorph (denoted α). Here we re-examine guanine, using detailed experimental X-ray electron diffraction...
Abstract The mechanisms by which organisms control the stability of amorphous calcium carbonate (ACC) are yet not fully understood. Previous studies have shown that intrinsic properties ACC and its environment critical in determining stability. Here, question, what is effect bulk incorporation versus surface adsorption additives on synthetic ACC, addressed. Using a wide range situ characterization techniques, it poly(Aspartic acid) (pAsp) has much larger stabilization than pAsp only 1.5%...
Abstract Biomineralization demonstrates nature's remarkable ability to precisely regulate mineral formation, controlling both polymorph selection and spatial organization. This fascinating level of precision has inspired the investigation into spatially controlled, laser‐induced crystallization. To this end, patterned crystallization is employed within a Magnesium (Mg)‐stabilized amorphous calcium carbonate (ACC) matrix, generating four distinct phases: calcite, stable dehydrated ACC,...
Abstract The nucleation and growth of bimetallic gold‐silver nanostars (GNSs) are investigated to elucidate their atomic‐scale formation mechanism. Motivated by the increasing demand for nanomaterials with enhanced optical catalytic properties, particularly applications in biosensing, bioimaging, photothermal therapy, this work focuses on understanding factors governing GNSs formation. synthesized reducing HAuCl₄ ascorbic acid presence AgNO₃, exploring influence temperature, delay time AgNO₃...
Biogenic calcite obtained from different mollusk shells is subjected to heat treatments at elevated temperatures and structurally analyzed by high-resolution synchrotron X-ray powder diffraction. Remarkable broadening of diffraction peaks in samples annealed above 200 °C observed (see figure), indicating heat-induced degradation intra-crystalline proteins occluded the mineral lattice during biomineralization.
The metallic luster from the skin of fish is due to a photonic crystal system composed multilayer stacks cytoplasm and crystals. crystals are described as thin (50−100 nm) plates guanine, with no reference their hydration state. We established through X-ray diffraction that structure anhydrous guanine. noted structure-function relationship exceptional compared other purines similar molecular stacking structure. These elongate in direction stacking, contrast biogenic guanine whose smallest...
Bandgap engineering of zinc oxide semiconductors can be achieved using a bio-inspired method. During bioInspired crystallization process, incorporation amino acids into the crystal structure ZnO induces lattice strain that leads to linear bandgap shifts. This allows for fine tuning in route. As service our authors and readers, this journal provides supporting information supplied by authors. Such materials are peer reviewed may re-organized online delivery, but not copy-edited or typeset....
Structures of the α and β phases resorcinol, a major commodity chemical in pharmaceutical, agrichemical, polymer industries, were first polymorphic pair molecular crystals solved by X-ray analysis. It was recently stated that "no additional can be found under atmospheric conditions" (Druzbicki, K. et al. J. Phys. Chem. B 2015, 119, 1681). Herein is described growth structure new ambient pressure phase, ε, through combination optical crystallography computational crystal prediction...
A review of the inclusion organic matter within single crystalline hosts: from biogenic minerals to bio-inspired nanohybrid crystal composites.
This article describes an experimentally versatile strategy for producing inorganic/organic nanocomposites, with control over the microstructure at nano‐ and mesoscales. Taking inspiration from biominerals, CaCO 3 is coprecipitated anionic diblock copolymer worms or vesicles to produce single crystals of calcite occluding a high density organic component. approach can also be extended generate complex structures in which are internally patterned nano‐objects differing morphologies. Extensive...
As organisms can form crystals only under ambient conditions, they demonstrate fascinating strategies to overcome this limitation. Recently, we reported a previously unknown biostrategy for toughening brittle calcite crystals, using coherently incorporated Mg-rich nanoprecipitates arranged in layered manner the lenses of star, Ophiocoma wendtii. Here propose mechanisms formation functional hierarchical structure conditions temperature and limited solid diffusion. We that proceeds via...
Abstract Healthy material alternatives based on renewable resources and sustainable technologies have the potential to disrupt environmentally damaging production consumption practices established throughout modern industrial era. In this study, a mycelium–nanocellulose biocomposite with hybrid properties is produced by agitated liquid culture of white‐rot fungus ( Trametes ochracea ) nanocellulose (NC) comprised as part media. Mycelial development proceeds via formation pellets, where NC...