A5075718757- Crystallization and Solubility Studies
- nanoparticles nucleation surface interactions
- Enzyme Structure and Function
- Calcium Carbonate Crystallization and Inhibition
- Solidification and crystal growth phenomena
- Planetary Science and Exploration
- Freezing and Crystallization Processes
- Minerals Flotation and Separation Techniques
- Geological and Geochemical Analysis
- Force Microscopy Techniques and Applications
- Astro and Planetary Science
- Hydrocarbon exploration and reservoir analysis
- Magnetic and Electromagnetic Effects
- Protein Structure and Dynamics
- Spaceflight effects on biology
- Metallurgical Processes and Thermodynamics
- Chemical and Physical Properties in Aqueous Solutions
- CO2 Sequestration and Geologic Interactions
- X-ray Diffraction in Crystallography
- Spectroscopy and Quantum Chemical Studies
- High-pressure geophysics and materials
- Gold and Silver Nanoparticles Synthesis and Applications
- Mineralogy and Gemology Studies
- Geophysical and Geoelectrical Methods
- Kidney Stones and Urolithiasis Treatments
Tohoku University
2015-2024
Nagoya University
2021-2024
Osaka University
2008-2023
Hokkaido University
2016
Olympus (Japan)
2016
Advanced Engineering Services (Japan)
2016
Japan Aerospace Exploration Agency
2016
Graduate School USA
2014-2016
Japan Space Forum
2016
Nagoya City University
2016
Samples of the carbonaceous asteroid Ryugu were brought to Earth by Hayabusa2 spacecraft. We analyzed 17 samples measuring 1 8 millimeters. Carbon dioxide-bearing water inclusions are present within a pyrrhotite crystal, indicating that Ryugu's parent formed in outer Solar System. The contain low abundances materials at high temperatures, such as chondrules and calcium- aluminum-rich inclusions. rich phyllosilicates carbonates, which through aqueous alteration reactions temperature, pH,...
Significance The formation of the nuclei protein crystals has been suggested to occur within protein-rich mesoscopic clusters. existence such clusters revealed for many proteins; however, their role in crystallization is still unclear. Our live images a solution using transmission electron microscopy reveal that are solid amorphous particles work as heterogeneous nucleation sites. event crystal starts via another noncrystalline particle, which appears only few seconds before nucleation, is,...
The microscopic understanding of the crystal growth and dissolution processes have been greatly advanced by direct imaging nanoscale step flows atomic force microscopy (AFM), optical interferometry, X-ray microscopy. However, one most fundamental events that govern their kinetics, namely, atomistic at edges, not well understood. In this study, we developed high-speed frequency modulation AFM (FM-AFM) enabled true atomic-resolution in liquid ∼1 s/frame, which is ∼50 times faster than...
We sought to identify and quantitatively analyze calcium oxalate (CaOx) kidney stones on the order of micrometers, with a focus quantitative identification monohydrate (COM) dihydrate (COD). performed Fourier transform infrared (FTIR) spectroscopy, powder X-ray diffraction (PXRD), microfocus computed tomography measurements (microfocus CT) compared their results. An extended analysis FTIR spectrum focusing 780 cm −1 peak made it possible achieve reliable COM/COD ratio. succeeded in 50-μm 2...
A kinetic model is developed to describe the growth of crystals under influence foreign particles in terms heterogeneous two-dimensional nucleation. In context this model, free energy barrier nucleation presence and kinetics for are examined theoretically. It follows that contact angle, size density adsorbed play a crucial role controling 2D kinetics. Based on our many experimental findings, such as dust-induced surface roughening various dislocation-free growth, properly interpreted. The...
Mineralogical processes taking place close to equilibrium, or with very slow kinetics, are difficult quantify precisely. The determination of ultraslow dissolution/precipitation rates would reveal characteristic timing associated these that important at geological scale. We have designed an advanced high-resolution white-beam phase-shift interferometry microscope measure growth crystals low supersaturation values. To test this technique, we selected the giant gypsum Naica ore mines in...
The formation of crystals from solution requires the initial self-assembly units matter into stable periodic structures reaching a critical size. early stages this process , called nucleation, are very difficult to visualize. Here we describe novel method that allows real time observation dynamics nucleation and dissolution sodium chlorate clusters in an ionic liquid using situ transmission electron microscopy. Using liquids as solvent circumvents problem evaporation charging, while...
The relative merits and domains of application three observation techniques (atomic force microscopy, Michelson interferometry, laser confocal microscopy with differential interference contrast microscopy) for the investigation crystal growth kinetics are discussed in context protein crystallization. Growth rate measurements on same system under identical experimental conditions using different show differences up to 5-fold a behavior as function supersaturation. These results terms mass...
We observed two-dimensional (2D) nucleation behavior on {110} and {101} faces of tetragonal crystals model protein lysozyme by laser confocal microscopy combined with differential interference contrast (LCM-DIM). measured, for the first time directly noninvasively, 2D rates using 99.99% pure lysozyme, 98.5% (Seikagaku Co.), intentionally added impure proteins (fluorescent-labeled covalently bonded dimer 18 kDa polypeptide). found that was dominant growth mechanism under conditions adopted in...
The occurrence of convective flows during crystal growth is believed to adversely affect quality. Space-based therefore actively pursued, particularly for protein crystals, because buoyancy-driven convection suppressed in microgravity. Here the authors demonstrate that magnetic fields can be used tune effective gravity from 1to−0.15g diamagnetic lysozyme crystals and damped, stopped, even reversed. velocity strongly reduced simulated This method provides a versatile accessible way realize an...
Three-dimensional colloidal crystals made of ferromagnetic particles, such as magnetite (Fe(3)O(4)), cannot be synthesized in principle because the strong attractive magnetic interaction. However, we discovered composed polyhedral nanocrystallites uniform size range a few hundred nanometers Tagish Lake meteorite. Those were formed 4.6 billion years ago and thus are much older than natural on earth, opals, which about 100 million ago. We found that each individual particle determines its...
The effects of inorganic and organic additives on the hydration structure crystal surface have been discussed in X-ray reflectivity studies molecular dynamics simulations. We now demonstrate their by conducting situ observations at a growing calcite frequency modulation atomic force microscopy (FM-AFM). show scale change supersaturated solution CaCO3 addition magnesium ions hydrophilic polypeptide. FM-AFM images revealed that increase number layers terrace from two to four layers. On other...
Abstract The pathogenesis of kidney stone formation includes multi-step processes involving complex interactions between mineral components and protein matrix. Calcium-binding proteins in stones have great influences on the formation. spatial distributions these are essential for evaluating vivo effects formation, although actual distribution is still unclear. We reveal micro-scale three different proteins, namely osteopontin (OPN), renal prothrombin fragment 1 (RPTF-1), calgranulin A...