| 研究生: |
陳志榮 Chen, za-zon |
|---|---|
| 論文名稱: |
流體中奈米微粒自結合傳遞與釋放技術之研發 Development of Nano-Particles Self-Assembling and Seeding Technology in Liquid Carriers |
| 指導教授: |
賴新一
Lai, Hsin-Yi Steven |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 機械工程學系 Department of Mechanical Engineering |
| 論文出版年: | 2004 |
| 畢業學年度: | 92 |
| 語文別: | 中文 |
| 論文頁數: | 180 |
| 中文關鍵詞: | 分子動力模擬 、布朗運動 、奈米微粒 、自結合 、擴散 、磁性流體 、釋放 、載體傳遞 |
| 外文關鍵詞: | Molecular Dynamics simulation, brownian dynamics, assembly, magnetic fluid, nanoparticles, release |
| 相關次數: | 點閱:105 下載:9 |
| 分享至: |
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早期具特定功能效果之微粒(如藥物)傳遞,大多利用微容器、粉體、流體等載體,經由某些控制機制(如外加電場、流場)以使載體能順利的到達到目的地。利用這類載體充當媒介的傳遞方式,一般難予高效率地將功能性粒子投遞到目的地,且大部分微粒在未到達目的時,即已就被沿途其他的物體(如管壁、器官、空氣)所吸收與分解,不但載體無法傳送到患部,且因其他物體吸收了不需要的微粒,常會造成一些不可預料的副作用,因此如何解決這類問題,提出解決之道,已成為當務之急。問題的癥結主要在於目前尚無一套完整的理論,可供此類研究與預估之用。有鑑於此,本研究乃提出一套奈米微結構自結合傳輸之理論,並針對特定應用,提出一組實測系統,以印證方法之可行性。
針對功能性粒子傳遞中所具備的自結合、載體傳遞與釋放等三個功能,首先將奈米微粒進行表面正或負電性鍍膜,並與表面負或正電性之功能性奈米微粒組成載體;再將此微粒載體投入受體中,配合磁性引導直接將微粒載體運送到目標區域;然後利用特定的釋放機制(如加熱或生物降解特性)讓微粒從載體上脫落,讓功能性粒子從載體上剝離,慢慢地釋放並擴散以通過目標區域的薄膜(如細胞膜)障礙直達目的地,此法可調控目的地所需之功能性微粒數量,使達成最佳的微粒傳遞效果。為完成上述功能的理論建構,本計畫首先採用了DLVO理論,配合電磁與流體力學理論,分別對自結合、載體傳遞與釋放擴散分別建模並加以整合,然後藉由分子動力與布朗動力模擬法,求取參數。
由本文所提之奈米微粒自結合、傳遞與釋放技術之理論估算模型與文獻資料比對,發現其平均誤差皆落在10%內,證明本理論精確可行。利用本研究之模型推估,可準確取得製程參數,預估奈米系統中之微觀參數以改善目前耗時又不經濟的實驗方式,大幅提高生產效率。最後將模擬所推估的數值分別帶入整合模型,即可用以探討各功能間之相關性,並可對微粒傳遞效率進行精算評估,以達到系統模型彈性模組化與電腦速算精確重演之雙重目標,此目標已經由本研究之整合估算,其傳遞效率可以藉由本模型之微調,比以往之效率提高10~15%,證實了此技術是非常有效的。
Traditionally, the delivery of functional particles in liquid media makes good use of capsules, powder and various liquid carriers. Unfortunately, in the traditional ways of delivery, a large portion of functional particles do not arrive at the infected areas. They were decomposed and assimilated by the organs, vessel walls and air bulbs in the way to the infected areas. That is not only inefficient, but also detrimental for bringing in various unexpected side effects to the major system. Thus, how to obtain a better model to allow the delivery process to be more accurately understood and controlled becomes extremely important and urgently needed in many industrial and medical practices.
In view of the need, a new approach by using the nano-particles coating and self-assembled technique is proposed for study. In the functional particles delivery system, three major processes, namely, the self-assembly, the seeding transportion, and the release of nano-particles, are carefully studied. In the self-assembly process, the surface of nano-particles are polarized and then assembled with functional particles to make a complete carrier. In the seeding transportation process, the carrier is injected into the neighborhood of the received zone, and then guided in the fluid flow to the infected areas by using the external magnetic media. In the particles releasing process, the nano-particles were released from the carrier by using either α-ray optical separation or biomedical dissolution techniques. The drug molecules are diffused into the cell membrane of the infected objects with an appropriate control on functional particles supply and seeding effect. In order to model the aforementioned processes, the project employs the theories of DLVO, electromagnetics and hydrodynamics for nanoparticle self-assembly, seeding, releasing and effect tracing. The molecular dynamics is employed to evaluate the process parameters for each of the subprocesses instead of using traditional empirical average values.
The interrelation among these three sub-processes is investigated and an integrated model is proposed. A computerized system is set up to conduct both the numerical and experimental data comparison for signature verification. The results indicate that the modeling procedure proposed in the work is satisfactory.
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