数μmのエアロゾル液滴が親水性表面にどのように沈着するのか?Micrometer-sized droplet aerosols on to a hydrophilic surface. 応用例:エアロゾル吸入器など

大気に浮遊する微粒子の沈着の場所について考えてみた。”Wet”微粒子は「親水性の高い」場所に多く沈着する。”Dry”微粒子”は「親水性の低い」場所に多く沈着する。Considered the location of the deposition of particles suspended in the air. The results: “More hydrophilic” area trapped more “wet” particles. The “less hydrophilic” area trapped more “dry” particles.

開発の事例:微粒子の合成と構造化 Example of Technology: Synthesis & Structuring of Particles (2018-2019)

浮遊する微粒子の構造化と集積化について、従来まで考証されていなかった物質の輸送に対する「駆動力のバランス」の視点からの技術手法を開発した。We have developed methods for synthesis & structuring suspended particles from the viewpoint of “balance of the driving force on the transport of matter”, which has not been considered before.

40℃の表面に気中微粒子を沈着させた流体制御 Can aerosol particles move/deposit, from 25 to 40 ℃ surface?

閉鎖空間における沈着を考慮したエアロゾルフローシステムを構築した。沈着効率が悪い従来法に代わって本手法を気液界面細胞曝露に応用できれば有用である。An aerosol flow system has been constructed to mimic the delivery of particles to the air-liquid interface. Potentially be applied for the deposition and analysis of submicron particles on various types of substrate without the need for vacuum imaging analysis..

同一ロウソクから親水性と疎水性の両方の粒子層が製造可能 From a single candle: we can make both hydrophilic & hydrophobic layers.

Using “soot” from a candle burning, we developed assembly routes to form hydrophilic or hydrophobic layers of carbonaceous nanoparticles. ロウソク燃焼の「煤」を用いて、親水性または疎水性を有するナノ粒子膜の作製する方法を開発。5000年前に中国で開発された、従来の「墨」技術と同じかどうか?

作物(小松菜)に水溶性微粒子を長期的に散布した後は? What happens after long-term spraying of water-soluble fine particles on a crop (komatsuna)?

Short Introductions of other papers: /paper/ Komatsuna plants were grown and exposed to ammonium sulfate (((NH4)2SO4), AS) submicron particles for 16 days (22.5 µg m−3 per day) in phytotrons. The amount of particles deposited on the leaf  decreased over time, because AS particles deposited on the leaf deliquesced, allowing ions such as SO42− in the…

Collection of fine particles in tap water (drinking water) by electrophoresis. 電気泳動法で水道水(飲料水)中の微粒子の採集

Other “intro” of papers from our lab >> /tag/paper/ Removal of iron-oxide particles after post-filtration in local potable water using an electrophoretic method Collaborated with: Univ. Putra Malaysia; Univ. Teknologi MARA, Malaysia Journal of Water Process Engineering: Vol. 9, Feb. 2016, Pages 208–214. doi: Full text/PDF: Researchgate, or here Keywords: Electrophoretic deposition; Fibre electrodes; Limiting flux;…

PAPER: Fine particles on bio-composite surface. ココナツ殻由来素材の表面に微粒子を集積

Other “intro” of papers from our lab >> /tag/paper/   HIGHLIGHTS:* Physical treatment on the biocomposite increases the surface roughness.* Single bond COOH network on the treated biocomposite promotes the particle deposition.* The network reduces the particles repulsion during the deposition process. # Bio-composite(バイオコンポジット)is a composite material formed by a matrix (resin) and a reinforcement of…

How small can the enzyme be ? 酵素(粒子)はどこまで小さくできるのか?

http://dx.doi.org/10.1016/j.enzmictec.2014.06.002 Transformation of an enzyme: from aqueous suspension to fine solid particles via electrospraying route 静電噴霧法による糖転移酵素の微粒化 by* Dept. of Process and Food Engineering, Univ. Putra Malaysia; * Biotechnology Research Institute, Univ. Malaysia Sabah; * Faculty of Chemical Engineering, Univ. Teknologi MARA; * Grad. School of Bio-Applications and Systems Engineering, Tokyo Univ. of Agriculture and Technology…

Are the particles deposited to the back of a sheet? 薄板の裏側まで微粒子が沈着するのか?

Simultaneous deposition of submicron aerosols onto both surfaces of a plate substrate by electrostatic forces M. Gen, S. Ikawa, S. Sagawa, I. W. Lenggoro e-Journal of Surface Science and Nanotechnology, 2014. http://dx.doi.org/10.1380/ejssnt.2014.238 Open access. サブミクロンの帯電粒子を気中に浮遊させて、目的の平板の両面に粒子群が沈着しているメカニズムを説明した。 【展開】植物の葉に沈着する微粒子の挙動(農薬等の散布法)の理解 【展開】自動車等の静電塗装の分野

PAPER: Effect of water-soluble particles on the growth of plants (2 years) 植物に水溶性微粒子を与えていたら?

JOURNAL: Atmospheric Environment (2014) http://www.sciencedirect.com/science/article/pii/S1352231014000405 Effects of 2-years exposure to (sub-micron) ammonium sulfate particles on growth and gas exchange rates of Fagus crenata (ブナ), Castanopsis sieboldii (スダジイ), Larix kaempferi (唐松) and Cryptomeria japonica (スギ) seedlings •No significant effect of the particles on growth was observed after 2 years. •Net photosynthetic rates of 3 species were not significantly changed….

PAPER. Deposition process of particles in forests, 森林への大気中微粒子の沈着過程

Particulate matter strongly adsorbed onto leaf surfaces is not washed away by rainfall and contributes to the EC (Elemental Carbon) flux. Leaf-surface particles must be included when evaluating the dry and total fluxes of particulate matter, in particular for water-insoluble constituents such as EC. 葉面に強く「付着」した粒子状物質は降雨によって洗い流されず、EC(元素炭素)フラックスに寄与する。粒子状物質、特にECのような水不溶性成分の乾燥流束および全流束を評価する場合には、葉表面粒子を含めなければならない。

PAPER: Measuring particles from mixed gases, ガス由来微粒子の計測

These results may be informative for predicting phenomena related to gas-to-particle conversion at the exit of stationary emission sources.火力発電所等の燃焼過程から生成すると考えられる混合排気ガスを実験室内で模擬した。This paper was awarded 2013 Takahashi Award from Japan Association Aerosol of Science and Technology. エアロゾル学会の2013年のTakahashi賞を受賞。