西南师范大学学报(自然科学版)
西南師範大學學報(自然科學版)
서남사범대학학보(자연과학판)
JOURNAL OF SOUTHWEST CHINA NORMAL UNIVERSITY
2014年
5期
52-58
,共7页
激光光学%金微粒%表面温度%热传导
激光光學%金微粒%錶麵溫度%熱傳導
격광광학%금미립%표면온도%열전도
laser optics%gold particle%surface temperature%heat conduction
激光照射纳米微粒法是基因转染的一种,其中涉及到的细胞成活率和基因转染率与纳米粒子的光热效应密切相关,且最终依赖于结合体表面所达到的温度。该文作为基因转染的前期工作,旨在能够方便地计算出脉冲激光照射下金粒子的表面温度,设计出激光照射靶的最佳参数,理论上提高转染效率。这里以脉冲激光与金粒子相互作用为研究对象,基于热传导方程,将粒子的吸热过程按照4个距离参数(R ,δ,χfτ,χAuτ)进行分割,并在每个加热区域分析出了表面温度的数学表达式。结果表明在激光功率密度为5×1011 W/cm2,波长为532 nm时,表面温度分析法得到的关于表面温度随金粒子半径变化的曲线趋势与米氏理论数值解析得到的趋势相同,数据点基本吻合。且在3种不同的脉冲持续时间下(30 ns ,30 ps ,30 fs)都得到了证明。另外,表面温度随金粒子半径和脉冲宽度变化的密度图还显示出了获得最大温度的参数关系式R=2χfτ。因此,依据加热区域的划分,利用表面温度分析的方法可以简便、准确地获得金粒子在激光参数下的表面温度,在理论上设计出了激光与金纳米粒子结合的最佳参数。
激光照射納米微粒法是基因轉染的一種,其中涉及到的細胞成活率和基因轉染率與納米粒子的光熱效應密切相關,且最終依賴于結閤體錶麵所達到的溫度。該文作為基因轉染的前期工作,旨在能夠方便地計算齣脈遲激光照射下金粒子的錶麵溫度,設計齣激光照射靶的最佳參數,理論上提高轉染效率。這裏以脈遲激光與金粒子相互作用為研究對象,基于熱傳導方程,將粒子的吸熱過程按照4箇距離參數(R ,δ,χfτ,χAuτ)進行分割,併在每箇加熱區域分析齣瞭錶麵溫度的數學錶達式。結果錶明在激光功率密度為5×1011 W/cm2,波長為532 nm時,錶麵溫度分析法得到的關于錶麵溫度隨金粒子半徑變化的麯線趨勢與米氏理論數值解析得到的趨勢相同,數據點基本吻閤。且在3種不同的脈遲持續時間下(30 ns ,30 ps ,30 fs)都得到瞭證明。另外,錶麵溫度隨金粒子半徑和脈遲寬度變化的密度圖還顯示齣瞭穫得最大溫度的參數關繫式R=2χfτ。因此,依據加熱區域的劃分,利用錶麵溫度分析的方法可以簡便、準確地穫得金粒子在激光參數下的錶麵溫度,在理論上設計齣瞭激光與金納米粒子結閤的最佳參數。
격광조사납미미립법시기인전염적일충,기중섭급도적세포성활솔화기인전염솔여납미입자적광열효응밀절상관,차최종의뢰우결합체표면소체도적온도。해문작위기인전염적전기공작,지재능구방편지계산출맥충격광조사하금입자적표면온도,설계출격광조사파적최가삼수,이론상제고전염효솔。저리이맥충격광여금입자상호작용위연구대상,기우열전도방정,장입자적흡열과정안조4개거리삼수(R ,δ,χfτ,χAuτ)진행분할,병재매개가열구역분석출료표면온도적수학표체식。결과표명재격광공솔밀도위5×1011 W/cm2,파장위532 nm시,표면온도분석법득도적관우표면온도수금입자반경변화적곡선추세여미씨이론수치해석득도적추세상동,수거점기본문합。차재3충불동적맥충지속시간하(30 ns ,30 ps ,30 fs)도득도료증명。령외,표면온도수금입자반경화맥충관도변화적밀도도환현시출료획득최대온도적삼수관계식R=2χfτ。인차,의거가열구역적화분,이용표면온도분석적방법가이간편、준학지획득금입자재격광삼수하적표면온도,재이론상설계출료격광여금납미입자결합적최가삼수。
The method of nano‐particles by laser irradiation is a kind of gene transfection ,where the in‐volved cell survival rate and gene transfection rate are closely related to the thermal effect of nano‐parti‐cles ,and ultimately depend on the surface temperature of combinations .As the prophase work of gene transfection ,this paper is aimed at calculating the surface temperature of the gold particles in the pulse la‐ser easily ,at designing the best parameter of the laser and gold particles ,and improving the transfection efficiency theoretically .Based on the heat conduction equation ,the pulse laser interaction with gold parti‐cles has been studied and the heat absorption process of the particle has been divided by the four distance parameters(R ,δ, χfτ , χAuτ) .T hen ,the mathematical expressions of surface temperature have been analyzed in each heating area .Results show that when laser power density is 5 × 1011 W/cm2 and the wave‐length is 532nm ,the surface temperature change with gold particle radius have been calculated respectively in two methods of the exact Mie solution and the above‐mentioned analytical method .The data results of two methods are basically the same .In this paper ,laser pulse width were 30ns ,30ps and30fs respectively . At last ,conditions of achieving maximum temperature are analyzed in the density figure about the surface temperature change with gold particle radius and laser pulse width .