陕西科技大学学报（自然科学版）
陝西科技大學學報（自然科學版）
협서과기대학학보（자연과학판）
JOURNAL OF SHAANXI UNIVERSITY OF SCIENCE & TECHNOLOGY
2007年
1期
26-31
,共6页
杭方学%卢群%丘泰球%姚成灿
杭方學%盧群%丘泰毬%姚成燦
항방학%로군%구태구%요성찬
超声场%诱导期%结晶%成核
超聲場%誘導期%結晶%成覈
초성장%유도기%결정%성핵
ultrasound%induction time%crystallization%nucleation
研究了超声场作用对反应结晶过程中成核诱导期的影响.以碳酸钙为实验对象,在不同频率和超声作用时间下观察了成核诱导期的变化,结果表明,结晶诱导期随着超声作用时间的增加而缩短.机理分析认为超声场对成核过程的主要影响有两个方面:溶液表面张力的下降和扩散系数的上升.超声场作用可降低成核诱导期.
研究瞭超聲場作用對反應結晶過程中成覈誘導期的影響.以碳痠鈣為實驗對象,在不同頻率和超聲作用時間下觀察瞭成覈誘導期的變化,結果錶明,結晶誘導期隨著超聲作用時間的增加而縮短.機理分析認為超聲場對成覈過程的主要影響有兩箇方麵:溶液錶麵張力的下降和擴散繫數的上升.超聲場作用可降低成覈誘導期.
연구료초성장작용대반응결정과정중성핵유도기적영향.이탄산개위실험대상,재불동빈솔화초성작용시간하관찰료성핵유도기적변화,결과표명,결정유도기수착초성작용시간적증가이축단.궤리분석인위초성장대성핵과정적주요영향유량개방면:용액표면장력적하강화확산계수적상승.초성장작용가강저성핵유도기.
The effect of ultrasound on reactive crystallization is studied by measuring the induction time. Calcium carbonate is used as the working substance precipitated by mixing CaCl2 and Na2CO3/NaHCO3 solutions. The experiments were carried with various frequencies and insonation time. It is observed that the induction time significantly decreases with increasing insonation time. The mechanismof the ultrasonic effect on nucleation is analyzed.The two effects of ultrasound are discussed. The surface tension (γ) decreased and the diffusion coefficient (DAB) increased in the ultrasound. The induction time reduced after ultrasound treating.
