Author
Takuji Okaya
Bio: Takuji Okaya is an academic researcher from University of Shiga Prefecture. The author has contributed to research in topics: Vinyl acetate & Polymerization. The author has an hindex of 18, co-authored 94 publications receiving 969 citations.
Papers published on a yearly basis
Papers
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TL;DR: In this paper, the authors measured the diameter distribution of hydrogen microbubbles (hydrogen particles) in electrolyzed alkaline water using the dynamic light scattering (DLS) method.
60 citations
Patent•
30 Mar 1984
TL;DR: Water-resistant compositions as discussed by the authors are composed of a modified polyvinyl alcohol having a silyl group in the molecule and an organic substance, useful as compositions for treating inorganic materials and defogging compositions.
Abstract: Water-resistant compositions which comprise a modified polyvinyl alcohol having a silyl group in the molecule and an organic substance, useful as compositions for treating inorganic materials and defogging compositions.
52 citations
TL;DR: In this paper, the authors investigated the effect of the linear velocity of water on the ratio of dissolved hydrogen in electrolyzed water using a solid polymer electrolyte (SPE) water electrolyzer using a DH-meter.
46 citations
Patent•
01 Jun 1988
TL;DR: In this article, a method for electric field orientation of liquid crystal polymers and oriented materials of polymers obtained by the method is described. But this method is based on a pulsating electric field which is predominantly unidirectional and whose magnitude is varying periodically or non-periodically to a liquid crystal polymer capable of forming an optically anisotropic melt phase.
Abstract: This invention relates to a method for electric field orientation of liquid crystal polymers and oriented materials of liquid crystal polymers obtained by the method. This electric field orientation method comprises applying a pulsating electric field which is predominantly unidirectional and whose magnitude is varying periodically or non-periodically to a liquid crystal polymer capable of forming an optically anisotropic melt phase. The oriented material of liquid crystal polymer thus obtained has been unidirectionally oriented and polarized. This oriented, polarized material of liquid crystal polymer can be utilized as a piezoelectric material, pyroelectric material, electret material, non-linear optical element or the like.
46 citations
TL;DR: In this paper, a model experiment with a low concentration of methyl methacrylate (MMA) was carried out in the presence of various initiators, ammonium persulfate (APS), 2,2′-azobis(2-amidinopropane)dihydrochloride (V-50) and 2, 2′-razobis (isobutyronitrile) (AIBN).
28 citations
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TL;DR: This Critical Review provides a critical review of the current knowledge vis-à-vis nanoplastic (NP) and microplastic (MP) aggregation, deposition, and contaminant cotransport in the environment and highlights key knowledge gaps that need to be addressed.
Abstract: Plastic litter is widely acknowledged as a global environmental threat, and poor management and disposal lead to increasing levels in the environment. Of recent concern is the degradation of plastics from macro- to micro- and even to nanosized particles smaller than 100 nm in size. At the nanoscale, plastics are difficult to detect and can be transported in air, soil, and water compartments. While the impact of plastic debris on marine and fresh waters and organisms has been studied, the loads, transformations, transport, and fate of plastics in terrestrial and subsurface environments are largely overlooked. In this Critical Review, we first present estimated loads of plastics in different environmental compartments. We also provide a critical review of the current knowledge vis-a-vis nanoplastic (NP) and microplastic (MP) aggregation, deposition, and contaminant cotransport in the environment. Important factors that affect aggregation and deposition in natural subsurface environments are identified and c...
1,338 citations
TL;DR: A survey of the available information on the environmental fate of polyvinyl alcohol (PVA) and PVA-based materials can be found in this paper, where the biochemistry and microbial physiology of PVA biodegradation and on the influence of environmental conditions are discussed along with the biodegrading processes of other water-soluble materials.
744 citations
TL;DR: In this article, a review article focused on the polymerization mechanisms and kinetics involved in such a heterogeneous polymerization system over the preceding 10-year period and discussed the origin of non-uniform latex particles from both the thermodynamic and kinetic points of view.
687 citations
TL;DR: In this paper, the advantages and possible fields of applications of this type of electrolyzers in comparison with another one are reviewed and some results achieved up to now in PEM electrolysis, including last achievement of the authors, are summarized.
547 citations
TL;DR: In this article, the relative prospects and the competitive force of Proton Exchange Membrane Fuel Cells (PEMFCs) in transportation, residential power generation and portable computers are discussed.
Abstract: Proton exchange membrane fuel cells (PEMFCs) have recently passed the test or demonstration phase and have partially reached the commercialization stage due to the impressive worldwide research effort. Despite the currently promising achievements and the plausible prospects of PEMFCs, there are many challenges remaining that need to be overcome before PEMFCs can successfully and economically substitute for the various traditional energy systems. With the many promising research efforts in overcoming these challenges, the most important tools for the commercialization of PEMFCs will be the technical data and information from a real PEMFC application test. For these reasons, this paper introduces and discusses the remaining challenges and some of the latest research on the application test of PEMFC to real systems such as transportation, residential power generation and portable computers. In addition, this paper describes and summarizes the relative prospects and the competitive force of PEMFCs in these fields. These prospects primarily depend on stable and economical high-purity hydrogen supplies, the scale of application, the existence of more efficient competitive power sources and the social viewpoints such as the health and environment benefits as well as infrastructural aspects associated with traditional power supply and demand. The review shows that PEMFC have the most promising applications to buses, recreation vehicles, and lightweight vehicles. Without doubt, the technology for a stable supply of high-purity hydrogen along with the corresponding infrastructure is essential for the success of PEMFC in various application fields.
535 citations