• Influence of Surface Treatment of SiO2 and Stirring Rate on Fragrant Oil Release Behavior of Poly(ε-caprolactone) Microcapsules
  • Park SJ, Yang YJ, Lee JR, Suh DH
  • 실리카의 표면 처리와 교반 속도가 폴리카프로락톤 마이크로캡슐의 향유 방출 거동에 미치는 영향
  • 박수진, 양영준, 이재락, 서동학
Abstract
In this work, the fragrant oil release behavior of poly(ε-caprolactone) (PCL) microcapsules containing SiO2 was in vestigated. The SiO2 was chemically treated in 10, 20, and 30 wt% hydrochloric acid and sodium hydroxide. The acid and base values were determined by Boehm's titration technique and N2/77 K adsorption isotherm characteristics, the specific surface area and total pore volume were studied by BET. The PCL microcapsules containing SiO2 and fragrant oil were prepared by oil-in-water (o/w) emulsion solvent evaporation method. The shape and surface of PCL microcapsules were observed using image analyzer and scanning electron microscope (SEM). The fragrant oil release behavior of PCL microcapsules was characterized using UV/vis. spectra. The average diameters of PCL microcapsules were decreased from 35 to 21 μm with increasing stirring rate. It was found that in the case of acidic treatment the fragrant oil adsorption capacity and release rate were increased due to the increase of specific surface area and acid value. In the case of basic treatment, the fragrant oil adsorption capacity and release rate were decreased due to the decrease of specific surface area and the increase of acid-base interactions between SiO2-NaOH and fragrant oil with increasing base value of SiO2.

실리카의 표면 처리가 마이크로캡슐의 향유 방출 거동에 미치는 영향에 대하여 고찰해 보았다. 표면 산-염기 처리 용액으로서 30 wt%, 20 wt% 그리고 10 wt%의 HCl과 NaOH 용액을 사용하였다. 실리카의 표면 산도 및 표면 염기도를 Boehm의 선택 중화법을 이용하여 측정하였으며, 그 흡착 표면적과 총 기공부피는 BET법을 이용한 N2기체의 흡착을 통해 알아보았다. 액중건조법을 사용하여 향유가 흡착된 흡착된 실리카를 심물질로 하는 PCL 마이크로캡슐을 제조하였으며, 다공성의 실리카에 향유를 흡착시키기 위하여 초음파를 이용하였다. 제조된 마이크로캡슐의 입도는 광학 현미경을 이용하여 관찰하였으며, FT-IR 측정을 통하여 심물질이 함입되었음을 확인하였다. 또한 마이크로캡슐의 향유 방출 거동을 살펴보기 위해 UV/vis. 흡광광도법으로 흡광도를 측정하여 용출된 향유의 양을 정량하였다. 실험 결과, 교반 속도가 증가함에 따라 평균입자 크기가 35 μm에서 21 μm로 감소하였으며, 실리카의 산처리를 통해 비표면적이 78.1에서 121.1 m2/g으로 증가함에 따라 향유의 흡착량이 약 20% 증가하고 염기처리를 통해 실리카의 염기도가 78에서 134 meq/g으로 증가하여 향유와 실리카의 산-염기 상호작용의 증가로 인해 향유의 시간에 따른 방출 속도가 감소함을 알 수 있었다.

Keywords: microcapsule; fragrant oil; poly(ε-caprolactone); surface treatment; release behavior

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This Article

  • 2003; 27(5): 464-469

    Published online Sep 25, 2003

  • Received on Jun 5, 2003
  • Accepted on Sep 8, 2003