Shinya Yamanaka

• Professor at Muroran Institute of Technology

Carbon dioxide (CO2) is one of the greenhouse gasses that has various effects to the earth atmosphere. In recent years, carbon-based adsorbent used for CO2adsorption. To increase the adsorption of CO2, the surface treatment should affect the adsorption sites. However, the mechanism of the ethanol surface treatment was lack of study. Hence in this s...

Hybrid gold nanoparticles (AuNPs) hold great potential in various applications, particularly for drug delivery. However, passive targeting of these hybrid AuNPs requires specific particle sizes and encapsulation efficiency to achieve high bioavailability and competency. Varying formulation parameters highly influence particle size and encapsulation...

The increasing CO2 output has garnered significant attention, with CO2 adsorption being a highly efficient method for capturing and utilizing this greenhouse gas. In this study, clay soil, which is naturally abundant, was examined for its potential application as a CO2 capture adsorbent. Clay soil samples were activated with phosphoric acid (H3PO4-...

The enhancement of carbon-supported components is a crucial factor in augmenting the interplay between carbon-supported and metal-active components in the utilization of catalysts for direct ethanol fuel cells (DEFCs). Here, we propose a strategy for designing a catalyst by modifying candle soot (CS) and loading nickel onto ordered carbon soot. The...

The discovery of cost-effective electrocatalyst materials suitable for anode catalyst for direct ethanol fuel cell (DEFC) is a significant problem. In this context, candle soot has been selected as a catalyst support material as it has higher electrical conductivity. Furthermore, there is a limited amount of research conducted on the use of candle...

Coamorphous formulation is a useful approach for enhancing the solubility of poorly water-soluble drugs via intermolecular interactions. In this study, a hydrogen-bonding-based coamorphous system was developed to improve drug solubility, but it barely changed the apparent permeability (Papp) of the drug. This study aimed to design a novel coamorpho...

The importance of permeability as well as solubility of the drug has been recognized in improving the solubility of poorly water-soluble drugs. This study investigated the impact of amorphous composites of indomethacin (IMC) and sulindac (SLD) on the membrane permeability of drugs. The IMC/SLD (1/1) formulation prepared by dry grinding was amorphou...

Citation: Shimamori, K.; Nambu, T.; Kawamata, D.; Kuragano, M.; Nishishita, N.; Iimori, T.; Yamanaka, S.; Uwai, K.; Tokuraku, K. Cultivation Factors That Affect Amyloid-β Aggregation Inhibitory Activity in Perilla frutescens var. crispa. Foods 2023, 12, 486. https://doi. Abstract: Alzheimer's disease (AD) is thought to be caused by the deposition o...

The liquid additive grinding method was used to improve the specific surface area (SSA) of calcium oxide (CaO) derived from scallop shells as a sustainable resource. Grinding was carried out using a planetary ball mill on a laboratory scale by stepwise addition of some polar and non-polar solvents to determine CaO grinding limit. The crystalline ph...

In this study, continuous crystallization of hydrocalumite (HC) using a Taylor vortex crystallizer was carried out as a recovery method of Ca dissolved in concentrated seawater. Further, in order to apply the crystallized HC to anion removal materials, the mechanism of anion removal properties of HC was investigated. Application of the Taylor vorte...

Spray freeze drying (SFD) is an ice templating method used to produce highly porous particles with complex pore architectures governed by ice nucleation and growth. SFD particles have been advanced as drug carrier systems, but the quantitative description of the morphology formation in the SFD process is still challenging. Here, the pore space dime...

Environmental issues caused by the rapid industrialization and urbanization of modern society are a serious problem. For example, conventional wastewater treatment technologies such as adsorption, coagulation, and filtration are expensive and cannot completely treat the discharge of organic pollutants in industrial wastewater. A promising alternati...

Abnormal aggregation and accumulation of misfolded proteins are involved in the development of various forms of amyloidosis. Aggregates that accumulate in organs induce an inflammatory response and cytotoxicity, and lead to organ failure. Although protein accumulation around an affected area in the body is an important stage that is directly linked...

Cadmium is adsorbed on calcium carbonate via chemisorption. All calcium carbonate polymorphs generate otavite (cadmium carbonate), indicating that the crystallographic differences in calcium carbonate should affect the chemisorption equilibrium and kinetics. This study investigates the influences of the polymorph and specific surface area on cadmiu...

Graphene oxide (GO) has theoretically been identified as a candidate for adsorbing formaldehyde molecules. However, whether GO can actually serve as a scavenger for formaldehyde resin adhesives must be experimentally verified due to the complex interaction between GO and formaldehyde molecules in the presence of resin, the competition between the f...

Previous studies on cadmium adsorption of calcium carbonate have found that polymorph, and, crystallinity are influential factors for adsorbing cadmium ions. The predominant factor for cadmium adsorption has yet to be elucidated because these factors are linked. To overcome this, here each factor is investigated separately. First, atmospheric grind...

We report a synthesis strategy for pure hydroxyapatite (HAp) using an amorphous calcium carbonate (ACC) colloid as the starting source. Room-temperature phosphorylation and subsequent calcination produce pure HAp via intermediate amorphous calcium phosphate (ACP). The pre-calcined sample undergoes a competitive transformation from ACC to ACP and cr...

This study is focused on surface-modified Fe3O4@SiO2 particles with precisely controlled sizes and shapes applied in magnetorheological (MR) fluids. After the preparation of the monodisperse spindle-shaped and cubic Fe3O4@SiO2 particles, surface modification with dodecyltrimethoxysilane (DTM) was carried out via a silane coupling reaction to increa...

Livestock farming is affected by the occurrence of infectious diseases, but outbreaks can be prevented by proper sanitary control measures. Calcium hydroxide (Ca(OH) 2 ), commonly called slaked lime, powder is traditionally used as a disinfectant to prevent infectious diseases in livestock. Since Ca(OH) 2 can inactivate a wide variety of pathogens,...

Environmental pollution by organic dyes used in industry is a serious problem in developing countries. Environmentally friendly treatment methods are being studied because conventional methods require chemical or additional decomposition treatment. In particular, oxidation via a photocatalyst is a promising alternative due to its chemical and physi...

ZnO/Au is expected to exhibit catalytic properties by absorbing ultraviolet and visible light because ZnO and Au nanoparticles can absorb ultraviolet and visible light, respectively. Doping studies on Au nanoparticles on ZnO (ZnO/Au) have been conducted to expand the absorption wavelength range. This study generates ZnO/Au particles by an ultrasoni...

Coagulation coefficient of aerosol particles due to Brownian motion is an important issue to describe change in particle size distribution. Motion of aerosol particles is diffusive in continuous region (small Knudsen number; Kn ), or like free molecular motion of gaseous molecular in free molecular region (large Kn ). Fuchs (1964) presented an expr...

A carbonation process to control the specific surface area of mesoporous calcium carbonate and the dissolution profile of ferulic acid on mesoporous carbonate particles are presented. The effects of water content on the physicochemical properties, specific surface area, pore size, crystallinity, and morphology are evaluated. Mesoporous calcium carb...

Calcium hydroxide has the potential to be an effective disinfectant against viruses and pathogenic bacteria due to its strong alkalinity. Herein we report user-friendly calcium hydroxide–based granules for livestock sanitation. The granules, which are composed of calcium hydroxide and natural zeolite, are produced via a high shear wet granulator wi...

Herein we report a new grinding method to obtain fine particles having high specific surface area which is difficult to realize a conventional dry grinding. Several inorganic carbonates and metal oxides have been studied. Planetary ball milling under dry conditions and subsequent water addition realize the particles with a crystallite size and equi...

Photocatalytic hydrogen (H2) production is an attractive hydrogen production technology. It is initiated by charge-separation in titanium (IV) dioxide (TiO2) upon photoexcitation. Electrons reduce water to generate H2 while holes oxidize hydroxide to generate hydroxyl radicals. TiO2 is widely used because it is inexpensive, chemically stable, nonto...

Microcrystalline cellulose derived from oil palm empty fruit bunch (OPEFB) was grinded in planetary ball mill with dry state (without solvent) and solvent-assisted (ethanol and acetone). The effect of dry state and solvent-assisted on morphological and structural changes of microcrystalline cellulose were investigated. The structure changes, includ...

Calcium carbonate has been studied more than 100 years as the subject of basic chemistry, materials science, chemical engineering, and so on. In the natural world, this is often found in seashells and bones of sea creatures, and when these settle on the ocean floor for millions of years it forms limestone. Specific surface area defined as the total...

Controlling particle size is important in powder technology. Here we report a scalable production process of mesoporous calcium carbonate with a controllable particle size. We focus on the effect of the aggregation rate on the obtained particles. In this study, we change the particle concentration (1.2–12 mass%) to control the aggregation rate and...

Intensive research has been carried out over the past few years to find industrial-scale methods for the preparation of monolayer or few-layer graphene. However, large-scale, economical production of graphene with a low level of defects remains challenging. In this chapter, we review the research on several techniques for production of single- and...

In order to evaluate aerosol penetrations through a fully developed laminar flow in a cylindrical tube, the trajectories of aerosol particles were calculated by a Langevin dynamics equation that can represent the Brownian motion of aerosol particles. In our calculations, two criteria of penetration distance were employed: the maximum distance that...

More than 200,000 tons of scallop shells are disposed annually alone in Japan. Nanoparticles derived from scallop shells have the potential to adsorb gaseous formaldehyde; therefore, such discarded shells have now been tested as additive filler in plywood adhesive by mixing high specific surface area, urea-modified shell nanoparticles with a resorc...

Calcium oxides with a specific surface area between 4.5 m² g⁻¹ and 62.5 m² g⁻¹ were obtained by calcination of scallop shells, following by methanol-assisted dry nano-grinding. Three distinct phases are formed on the surface of these catalysts during nano-grinding: calcium methoxide, calcium hydroxide, and calcium oxide. The effects of specific sur...

Measuring the size distribution of fine particles (<5 µm) in a few hours is difficult when using the sedimentation method due to a decrease in sedimentation rate. Herein, we discussed the validity of using a combination of the buoyancy weighing–bar method and the Rosin–Rammler equation to estimate the particle size distribution. When the cumulative...

Brownian diffusion is one of the most important and interesting natures of aerosol particles. It has much effects on aerosols in small-sized space such as aerosol transport through a tube, instruments for aerosol measurements, and fabrication of especially nano-sized aerosols. Numerical simulations of aerosol transport are useful in analysis of aer...

We report a simple strategy to synthesize vaterite/calcite mesoporous calcium carbonate through collisions and organization of colloidal particles accelerated by mechanical stirring. Mechanically stirring the precursor colloidal dispersion can control the calcium carbonate polymorphs.

This study demonstrates that the buoyancy weighing-pan method is suitable for measuring the particle-size distribution of floating particle after correction line is applied to the obtained results. After the correction line is applied to the buoyancy weighing-pan method results, then these results agree with the laser diffraction/scattering method.

We report effective uses for discarded shells as an additive of plywood adhesive because more than 200,000 tons of scallop shells are disposed of annually in Hokkaido alone. In our previous work, we proposed so-called “nano-grinding method” in which nano-sized scallop shells were produced by planetary ball milling under dry condition and subsequent...

We report a scalable production process of mesoporous calcium carbonate with calcite and/or vaterite phase. Here the effect of fatty acids （butanoic acid, octanoic acid, and decanoic acid） addition on the particle properties such as particle shape, crystal phase, and specific surface area was investigated. In our process, two types of mesoporous pa...

Langevin dynamics (LD) was used to simulate Brownian diffusion of aerosol particles with absorption walls on both sides. The results of LD calculations were compared with analytical solutions of the diffusion equation. Differences between the results obtained by LD calculation and the diffusion equation were organized by the dimensionless number Kn...

Scallop shells are disposed more than 200,000 ton per year in Hokkaido. Here we report effective uses for discarded shells as an additive of plywood adhesive because some plywood adhesives emit formaldehyde that leads to limit on its use. We produced adhesive resin filling ground shell particles with a high specific surface area to reduce formaldeh...

Here, we report a scalable and template-free production strategy in the synthesis of a mesoporous calcium carbonate, which undergoes self-assembled nanostructure formation through a temperature-induced aggregation and polymorphic transformation of the colloids. The specific surface area and pore size distribution of resulting mesoporous calcium car...

To clarify the effect of calcium ions on the growth and transformation of S. platensis, the alga was cultured in calcium ion-deficient medium. The growth of neither spiral nor linear forms of S. platensis was not affected by calcium ions. However, when cultivated in calcium ion-deficient medium, the spiral form transformed into the linear form. Lin...

Copper oxide coating onto electric conductive iron particles was carried out. We have proposed a macroscopic method to examine the coating state by measuring the specific resistance of a pallet made out of coated particles. We have also performed a mass balance analysis of feed and coated particles, and X-ray diffraction analysis. Since iron and co...

Scallop shells, which are a waste product in the seafood industry, are disposed more than 200,000 ton per year in Hokkaido, Japan. We report effective uses and simple application for discarded shells as a formaldehyde adsorbent. The adsorption performance of scallop shells to remove formaldehyde vapor is investigated. Planetary ball milling under d...

Magnetic iron–conducting polymer–palladium ternary nanocomposite microspheres were synthesized in a one-pot, single step process via aqueous chemical oxidative polymerization. These microspheres functioned as an efficient catalyst for the Suzuki–Miyaura cross-coupling reaction and can be readily recycled using only a magnetic field.

Herein the author introduces our recent research on a mechanical grinding of natural graphite particles and its compound. In the first topic, we propose a production scheme for conductive films composed of thin graphite sheets with high crystallinity and polymeric resin. Crystalline graphite sheets are successfully produced from natural graphite po...

Herein we report colloidal dispersibility of concentrated suspensions containing fatty acid-capped iron nanoparticles and its influence on the static and dynamic magnetorheological (MR) response. The amount of fatty acid absorbed on the surface controls the non-field dispersion state as well as weakly and strongly flocculated structure of the nanop...

Herein we propose a production scheme for conductive films composed of thin graphite sheets with high crystallinity and polymeric resin. The crystalline graphite sheets were successfully produced from natural graphite powder by solution-phase synthesis of graphite intercalation compounds (GICs), following a wet planetary-ball milling under mild con...

Herein we produce high-crystallinity graphite particles having high specific surface area by means of planetary ball milling under the well-controlled atmosphere. PtCl4-graphite intercalation compounds (PtCl4-GIC) are successfully synthesized as the catalyst for hydrogenation reaction of gaseous 1, 3-butadiene. The effect of specific surface area a...

Crystalline natural graphite displays an excellent mechanical and a chemical property that makes it a promising raw material for versatile applications, e.g., batteries, solar cells, and transparent conductive films. A production scheme that involves mechanical grinding of exfoliated graphite intercalation compounds (GIC) for the production of crys...

Improvement of proton conductivity of solid electrolyte films needs to form three-dimensional proton conduction paths by controlling the pore size and the pore structure between particles in particle films. A particle assemble method using electrophoretic deposition technique is useful for speedy and mass production assembly. In the electrophoretic...

Liquid–liquid interfacial crystallization was proposed as a novel method of controlling crystal shape and size of precipitated solute particles. The crystallization was performed at interface forming two separate phases of aqueous solution and organic solvent in the present study, and progressed by increase of supersaturation caused by the slightly...

Functional plywood can produce constant heat by applying a voltage to the conductive bonding layer between wood sheets. Herein functional plywood was prepared by filling various microsized graphite particles (3.3-52.5μm in diameter) and nanosized carbon black (CB ; 29 nm) into a phenolic resin. To investigate the electrical conductivity, the result...

For the purpose of investigating solid base catalysis of calcium oxide for transesterification of soybean oil with refluxing methanol, the catalyst collected after the reaction was characterized by several instrumental methods: X-ray diffraction, scanning electron microscopy, solid state 13C-NMR. The collected catalyst consisted of calcium glycerox...

Heterogeneous nucleation and nucleation period of calcium carbonate on the mica and the highly oriented pyrolytic graphite (HOPG) substrate have been investigated. Calcium carbonate was prepared by the reaction of calcium nitrate solution with sodium carbonate solution. In the reaction crystallization of calcium carbonate, calcite and vaterite were...

Molecular dynamics simulations of supersaturated aqueous NaCl solution including the Pt(100) or NaCl(100) crystal surfaces have been performed at an average temperature of 298K. The behavior of the NaCl cluster produced in the solution have been studied through the consideration of the water dielectric property near the crystalline surfaces for und...

Interfacial crystallization, such as surface crystallization in solution (solid-liquid) and liquid-liquid crystallization, gives us an asymmetric reaction field and is a technique for morphology control of crystals. In the liquid-liquid crystallization, the concentration distribution of solute ions and solvent molecules at the liquid-liquid interfa...

Fuel cells have been paid attention as a pollution-free power system for next-generation. For a widespread use of the fuel cells, the development of hydrogen storage materials is needed from the viewpoint of safe fuel supplies. Surface and inner microstructures of the materials have much effect on their hydrogenation and dehydrogenation characteris...

Heterogeneous nucleation and crystal growth of calcium carbonate on the mica and the highly oriented pyrolytic graphite (HOPG) substrate have been investigated by means of an atomic force microscope (AFM) with a contact mode procedure. AFM observation could lead to initial crystallization processes that were amorphous and crystalline, with an inter...

For the purpose of investigating the solid base catalysis of calcium oxide for transesterification of soybean oil with refluxing methanol, the catalyst collected after the reaction was characterized by several instrumental methods : X-ray diffraction, scanning electron microscopy, solid-state 13C-NMR. The collected catalyst consisted of calcium gly...

Molecular dynamics simulations have been performed for the design of operating conditions of liquid-liquid interfacial crystallization and clarifying the crystallization mechanism. It was found that solute ions were dehydrated with diffusion of the hydration ions from solution to organic phase. There were a significant difference of the dehydration...

Much interest has been taken in finding a solid base catalyst for a reaction to produce biodiesel. Calcium oxide has the great advantage of the enhanced catalytic activity, but the soluble substance is leached away from the solid base catalyst during the reaction. In this paper, the leaching of solid base catalyst was investigated on the basis of d...

Much interest has been taken in crystallizing silver nano-particles on metal oxide, for the purpose of using their composite as a noble catalyst for synthetic organic reactions. We studied crystallization of silver nano-particles onto TiO2photocatalyst with the help of reducible action of ethanol. Reducible action of ethanol was regulated by dosing...

In order to study solid base catalyst for biodiesel production with environmental benignity, transesterification of edible soybean oil with refluxing methanol was carried out in the presence of calcium oxide (CaO), -hydroxide (Ca(OH)2), or -carbonate (CaCO3). At 1h of reaction time, yield of FAME was 93% for CaO, 12% for Ca(OH)2, and 0% for CaCO3....

For developing a process of biodiesel production with environmental benignity, much interest has been focused on solid base catalysts such as calcium oxide for transesterification of vegetable oils with methanol. In this paper, the active phase of calcium oxide was investigated by characterizing the catalyst collected after achieving the conversion...

A new solid base catalyst made of calcium oxide for biodiesel production was characterized. Its catalytic activity was studied for transesterification of soybean oil at reflux of methanol using a glass batch reactor. Calcium oxide changed into calcium diglyceroxide by combining with by-produced glycerol during the transesterification. The used cata...

Catalysis by CaO/SiO2 composite (silica-supported calcium oxide) was studied for production of biodiesel, which has attracted interest as a means to reduce greenhouse gas emissions. The catalyst composite was prepared by carbonation of Ca(OH)2 in an aqueous suspension including the silica support, followed by calcination in an argon gas flow. In th...

Waste cooking oils were studied as the raw material for biodiesel production using calcium oxide as the solid base catalyst in refluxing methanol. Edible soybean oil and waste cooking oil from restaurants were converted into biodiesel completely within 2 hr. However, catalyst recovery after the reaction markedly decreased for the waste cooking oil,...