親水性表面への数μmのエアロゾル液滴の沈着 Micrometer-sized aerosols/ droplets on a hydrophilic surface

Droplet generator: Ultrasonic nebulizer (1.7 MHz). Micrometer sized sprayed droplets include silica nanoparticles (average particle diameter of 145 nm). A single substrate with areas having different “level” of hydrophilicity was used as a model surface. A low-pressure analysis method (electron-microscope SEM) and ordinary (1 atm) pressure methods (Raman spectroscopy and X-ray fluorescence) analytical results indicated…

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..

液中粒子の表面電荷とそれらのエアロゾル化時の荷電との関係 Between surface charges of colloidal particles and their corresponded aerosols.

Interaction between surface charge (zeta potential) of colloidal nanoparticles and the charge induced droplets suspended in the gas phase by electrospray is investigated for the first time. 液相中のナノ粒子の表面電荷(ゼータ電位)と気相中操作(静電噴霧)により懸濁液滴の荷電(電荷)の間の相互作用について初めての研究。

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?

PAPER: Charge of Particle by Kelvin Probe Force Microscopy. ケルビンフォース顕微鏡で粒子の帯電を計測

呼吸により人体に入る微粒子の帯電状態が注目された。本研究では大気中に浮遊する微粒子の帯電状態を評価できる手法を考案。The importance of electrostatic charging state to particle deposition in the human airways has been suggested. We developed a measurement method of electrostatic charging state of individual ambient aerosol particles

Student presented “Pump-less spraying”: Symposium of Institute for Liquid Atomization & Spray Systems, 微粒化シンポジウム

2014/12/18, Hirosaki City (Aomori Pref.) 第23回 微粒化シンポジウム 23rd Symposium of the Institute for Liquid Atomization and Spray Systems – Japan (A133) 毛細管現象を利用した Pumpless 静電微粒化法に関する研究 (M2)竹松 佑介, Wuled Lenggoro 通常の駆動力である液体供給装置(ポンプ)を用いない、毛細管現象だけで静電気力型噴霧法の開発。工夫を加えたところ数時間運転が可能であることも判明 Presentation by student. 学生による学会等の発表

Kusdianto, Doctoral presentation, 19 Aug. 2014, 博士論文公聴会

19 Aug. 2014. BASE 1st floor meeting room DOCTORAL THESIS: The role of chemical and physical properties of substrate in the deposition of particles 粒子の沈着における基板表面の物理的・化学的特性の役割 by KUSDIANTO (Also a faculty member of Department of Chemical Engineering, Institut Teknologi Sepuluh Nopember, ITS)

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: with a project funded by MEXT Kakenhi (2011-2014)科研費の成果

科研費の結果に関するサイトです。 (研究課題番号:23560904) PROJECT TITLE: Multi-dimensional assembly and assessment of high-crystalline fine particles via charged aerosol route. 帯電エアロゾルを用いた高結晶性微粒子の多次元集積と評価 ARTICLE 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 ARTICLE Area-selective deposition of charged particles…

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….