The fe3o4 nano - particles were converted from hydrophilic to oleophylic by being modified by oleic acid . the heat change in the adsorption process of fe3o4 nano - particles to oleic acid was measured and discussed by using microcalorimetry . the adsorption mechanism was analyzed 本文采用油酸作为表面活性剂对fe _ 3o _ 4纳米粒子进行了改性，实现了fe _ 3o _ 4由亲水性向亲油性的转变，并利用tamair等温微量热检测仪研究了在不同温度下，油酸与fe _ 3o _ 4吸附过程中的热量变化情况，讨论这个过程中热量的变化，分析了两者之间的吸附机理。
