How to make hydrophilic or hydrophobic layers from candle burning? 一本のろうそく燃焼から親水性、疎水性膜ができる?



Using “soot” from a candle burning, we developed two assembly routes to form hydrophilic or hydrophobic layers of carbonaceous nanoparticles.



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「Route-2: “Wet”」では、集積したすす粒子を懸濁液に移し、静電噴霧法(エレクトロスプレー)によって気中分散し、集積させた。


分光法(190-2500nm)の曲線勾配から、”Wet” routeは、”Dry” routeと比較して、近赤外領域でより高い吸光度を示す。このスペクトルの違いは、各ルートによって形成されたナノ粒子層の形態の変化に起因する。

To investigate the properties and structures of soot particles derived from candle combustion, two deposition routes were performed.

In “Route-1,” the aerosol (soot) particles were collected by direct exposure of a substrate in a chamber with controlled airflows.

In “Route-2,” deposited soot nanoparticles was transferred into suspension and subsequently, the deposition of particles on to the substrate was achieved by an electrospray.

Raman spectral analysis has shown the difference of G-band intensity relative to D-band between hydrophobic and hydrophilic particle layers obtained from different collection regions of the candle flame. It also reveals the effect of airflows during the collection to the ratio of the D to G peak. Meanwhile, the Raman spectra of the particles seem invariant to the preparation methods of suspension and electrospray deposition process.

From the curve gradient of spectroscopy (190–2500 nm) results, the electrospray-deposited particle layers (Route-2) show higher absorbance in the near-infrared region compared to direct-deposited particle layers (Route-1). This change in the spectrum may due to the change in morphology of nanoparticle layers formed by each route.

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