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第724章 材料学的实操经验
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第724章 材料学的实操经验 六

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    聊到后半段,话题越扯越深。
    陈祥宝提了一嘴,说如果单靠原位聚合不好控,也可以考虑拿嵌段共聚物做模板,先让基体自己分出微相,再把导电组分“赶”到相界面上去长。
    “不过嵌段共聚物的相行为挺复杂,什么时候分相、分成什么形貌,得一个体系一个体系去测。”
    “也许也不用全靠测。”徐辰拿过马克笔,在白板空白处写下一个式子,“对称的两嵌段共聚物,平均场理论下,χN大约到10.5就是有序-无序转变点,Leibler在1980年就算出来了。再往上走,层状、柱状、螺旋二十四面体相,基本都能从自由能泛函里推出来。”
    他一边说,一边把几种常用嵌段体系的Flory-Huggins参数随温度的变化趋势列了出来,顺手标注了其中两种冷门体系的转变温度区间。
    写到一半,他又觉得平均场近似在这里不够用,干脆在旁边补了一段涨落修正,用重整化群的思路把临界区附近的偏差估了出来。
    整个过程行云流水,马克笔几乎没停过。
    李丁平手里的茶杯,不知什么时候已经放下了。
    涨落修正、重整化群,这是他们凝聚态物理的看家本领。甚至可以说,重整化群是整个现代物理学中最深奥的数学工具之一,最早是肯尼斯·威尔逊用来解决量子场论和相变临界现象的,并因此斩获了1982年的诺贝尔物理学奖。
    可他自问,就算是自己,想在白板上这么干脆利落地把这套用于宇宙级或者夸克级相变的顶级物理工具,降维打击般地扔进高分子材料的相行为计算里,也得先翻翻笔记。
    陈祥宝则是盯着那几个转变温度区间,眉头越皱越紧。
    其中有一种体系,是他们组前几年做某特殊涂层时用过的,当时那个转变温度,是组里两个博士生在DSC上测了小半年才测准的数据。
    这小子居然是从理论上直接算出来的?
    ……
    陈祥宝心里正翻江倒海,嘴上却没露出来。他沉吟片刻,决定换个方向再探探这小子的底。
    “对了,成膜之后的除溶剂,你打算怎么处理?”陈祥宝像是随口一问。
    “这个简单。”徐辰几乎没怎么犹豫,“直接放进真空烘箱,一口气抽到最高真空,温度设在溶剂沸点以上,一步到位,效率最高。”
    他说得理直气壮。
    如果纯粹从理想的工程热力学模型上讲,这个回答挑不出毛病:压力越低,沸点越低;温度越高,蒸气压越大。两头一起使劲,热力学势能梯度最大,溶剂跑得最快,可以说是理论上的“绝对最优解”。
    办公室里安静了两秒。
    陈祥宝看着他,表情逐渐变得哭笑不得,就像看着一个刚进组、第一天就要拿手去摸几某度高温马弗炉的研一新生。
    “你这么一抽,膜里的溶剂会瞬间沸腾,整张膜全是气泡,跟发面馒头似的。”老院士无奈道,“表面溶剂干得太快,会迅速结成一层硬壳,底下的溶剂气化后逃逸不出来,这就叫‘溶剂包裹’。在实验室里这就叫废样,在工厂里这就叫生产事故。得阶梯降压,先低真空慢慢赶,温度也一点点往上提。这都是本科实验课上,老师盯着教的东西。”
    话说到这儿,陈祥宝下意识地一皱眉,后半句差点就顺嘴蹦了出来。
    “这点基本常识都不懂,你本科实验课是怎么混过来的?!”
    这是他在组里训学生训了几十年的口头禅,张嘴就来,比条件反射还快。
    不过突然反应过来对面这位年轻人不是自己学生。
    倒不是陈祥宝脾气差。
    而是材料学实验室,本质上就是一个天天和高温、高压、强酸强碱、易燃易爆打交道的地方。
    所谓安全规程,每一条都是前人用血写出来的,不严厉点是真要出人命的。
    ……
    “呃……受教了。”徐辰摸了摸鼻子,有点尴尬。
    陈祥宝没再说什么,心里却已经开始犯嘀咕了。
    因为这已经不是第一次了。
    刚才聊原位聚合的时候,说到氧化剂怎么加,徐辰下意识的回答是:按化学计量比算好,一次性投料。
    当时陈祥宝只当他是一时口快,随手纠正了一句:聚苯胺这一类的聚合是放热反应,一次性加进去,局部温度飙升,链长和形貌全乱套,搞不好还会冲料。正确的做法是把反应瓶坐在冰浴里,用蠕动泵一滴一滴慢慢加。
    一次是口误。
    两次,那就是真没干过。
    ……
    李丁平在一旁看着,忍不住暗暗心惊。
    作为物理学家,他震惊于徐辰对物理底层方程那种信手拈来的掌控力。刚才那段涨落修正,简直就像是在操控自己的手脚一样自然。
    而陈祥宝,则是越听越觉得头皮发麻。
    作为材料学泰斗,他震惊于徐辰对相行为热力学、聚集动力学以及微观组分计算的深刻理解。这小子不光能随口报出经典文献的作者和年份,连一些冷门高分子体系的转变温度,都能直接从理论上推出来!
    但是!
    一旦聊到真空烘箱怎么抽、氧化剂怎么滴这种具体的实验操作,徐辰却会表现出一种近乎初学者的茫然。
    更诡异的是,他那两个错误答案,放在纸面上全都“理论正确”。
    一个是热力学最优,一个是化学计量比最优。
    唯独缺了那一层,只有在实验室里亲手炸过瓶、烧过样、被导师骂过的人,才会长出来的肌肉记忆。
    这特么是什么畸形的知识结构?!
    ……
    在正常的科研教育体系里,理论和实践是相辅相成的。尤其是材料学,不进实验室烧炉子、不亲手调配各种参数,根本不可能顺利毕业。
    可徐辰刚才展现出的理论水平,至少是杰青甚至是准院士级别的!
    但他对实操工艺的认知,居然比一个刚进实验室的本科生还要小白!
    李丁平和陈祥宝对视了一眼,两人都在对方的眼中看到了巨大的疑惑。
    你不可能在完全没进过厨房的情况下,光靠看菜谱就成为米其林三星大厨。
    可徐辰给人的感觉就是,他好像真的没怎么进过实验室,但他却拥有着至少是杰青、甚至准院士级别的恐怖理论水平!
    这他妈是什么妖孽?!
    难道……全都是自学的?!
    ……
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