Phase Behavior of Sodium Dodecyl Sulfate-n-Butanol-Kerosene-Water Microemulsion System

Experiments were carried out to investigate the influences of cation from electrolytes and acidity/alkalinity on the phase behavior of sodium dodecyl sulfate-n-butanol-organics-water （with electrolytes） microemulsion sys-tem. The organics used is commercial kerosene. The volume ratio of water to organics is 1︰1. The results show that the type and valence of electrolyte cations are important factors influencing the microemulsion behavior. Biva-lent Ca2＋is more effective than monovalent K＋and Na＋for the formation of Winsor type III and II microemulsion. For electrolytes with the same monovalent cation Na＋, i.e. NaCl and Na2CO3, anions in the electrolyte have some effect. Bivalent anion 23CO - leads to a lower activity of cation Na＋than monovalent anion Cl-. NaOH （or KOH） behaves similar with NaCl （or KCl）. When HCl is used as electrolyte, its acidity plays an important role. Phase in-version of microemulsion from type III （or II） to type I is observed through precipitation of Ca2＋using Na2CO3, neutralization of HCl by NaOH, and addition of water to the system, which releases the oil from the microemulsion.     

一种可用于模块化设计的热关断电路

提出了一种可用于模块化设计的热关断电路,采用0.8μm BiCMOS工艺参数进行仿真分析表明:该电路温度灵敏度高,不需要另外的基准信号,超低静态功耗,并可以通过外部信号来控制工作状态,可用于1.5V～12V电源,能够作为电源管理芯片以及接口电路芯片中的过热保护模块。     

一种具有指数型温度补偿的带隙基准源

文章介绍了一种利用Bipolar管的电流增益随温度呈指数型变化的规律,对带隙基准进行温度补偿的指数型温度补偿技术。该电路具有温度补偿精度高、电路结构简单且能输出高电位电压基准等优点。采用0．8μm BiCMOS的工艺模型,在电源电压为12V的情况下模拟分析,该电路在-45℃ -+85℃的温度范围内具有较好的温度漂移抑制。