CN111004391B - 一种大小可控的纳米聚多巴胺的制备方法 - Google Patents
一种大小可控的纳米聚多巴胺的制备方法 Download PDFInfo
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- CTENFNNZBMHDDG-UHFFFAOYSA-N Dopamine hydrochloride Chemical compound Cl.NCCC1=CC=C(O)C(O)=C1 CTENFNNZBMHDDG-UHFFFAOYSA-N 0.000 claims abstract description 6
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Abstract
本发明涉及一种大小可控的纳米聚多巴胺的方法,具体为:称取适量盐酸多巴胺于50mL烧瓶中,加入适量的碱性水溶液,磁力搅拌至溶解,控制pH值,待用;另称取一定量的高铁酸钾溶于碱性水溶液中,将该溶液经滴液漏斗缓慢滴加到上述烧瓶中,在一定温度下磁力搅拌一定时间;反应结束后,经冷却、过滤、冷冻干燥至恒重,得到聚多巴胺产物。该方法的优点在于采用环境友好的溶剂和氧化剂,达到快速高效制备聚多巴胺的目的,产率高,并根据聚合条件的选择,可以得到大小尺寸可控的聚多巴胺纳米粒子,纳米粒径的直径小于200nm。这为制备聚多巴胺双亲性复合物、智能涂料提供了良好的平台,在海洋防腐和防污领域的应用前景广阔。
Description
技术领域
本发明属于聚多巴胺制备技术领域,一种用氧化法制备纳米聚多巴胺的方法。
背景技术
来源于仿生贻贝的多巴胺(dopamine,DA)分子聚合形成的聚多巴胺(polydopamine,PDA)材料,由于具有制备简单多样、良好的生物/细胞相容性、表面修饰反应等众多优点,成为当前研究的重要功能材料之一,广泛应用于自组装单层沉积长链分子、多层膜、无机材料的表面改性、纳米胶囊、药物递送、锂离子电池、传感器、环境等众多前沿学科。聚多巴胺在玻璃、不锈钢、聚四氟乙烯、石材等表面上都具有很强的黏附性,能够应用于任何类型的表面,而不用考虑基体材料的化学性质,尤其适用于涂料工业。然而,传统聚多巴胺制备方法仍存在以下缺点:聚合时间长、氧化剂毒性对环境的影响,涂层均匀性欠佳、涂层稳定性差、黏附力与沉积机理不清和同质化的应用设计,阻碍了聚多巴胺的应用。基于上述问题,本文发展了聚多巴胺的快速制备技术。
目前用于催化氧化多巴胺聚合的研究中,采用的氧化剂有(NH4)2S2O8、NaIO4、CuSO4、CuSO4+H2O2、KMnO4等(Wei Q,F Zhang,J Li.et al.2010.10.1039/c0py00215a;Bernsmann F,V Ball,F Addiego.et al.2011.10.1021/la104981s;Kim H W,B DMcCloskey,T H Choi.et al.2013.10.1021/am302439g;Ponzio F,J Barthès,J Bour.etal.2016.10.1021/acs.chemmater.6b01587;Zhang C,Y Ou,W-X Lei.etal.2016.10.1002/anie.201510724)。这些氧化剂的不足之处是合成聚多巴胺耗时较长,一般都在5至6小时以上,产率低,难以循环利用,对环境产生危害。此外,氧化剂用量较多。而且有些氧化剂如KMnO4、(NH4)2S2O8、CuSO4+H2O2、CuSO4对金属表面产生伤害,从而限制了聚多巴胺在海洋涂料上的应用。
综上所述,尽管目前制备聚多巴胺已经有很多报道和专利,但是绿色高效、条件温和、反应时间短的制备方法,尤其不需要经过复杂和危险的前处理,仍然是聚多巴胺制备的追求目标。
发明内容
本发明所要解决的问题是提供一种绿色高效的聚多巴胺制备方法,这种方法克服了其他氧化剂合成聚多巴胺耗时长、产率低且氧化剂对环境有害不可回收利用的缺点。目的是改变现有的制备方法,提供一种绿色无毒氧化剂高铁酸钾制备聚多巴胺的方法,同时整个制备过程对环境友好。
本发明具体采用的技术方案如下:
一种大小可控的纳米聚多巴胺的制备方法,它的步骤如下:(1)取盐酸多巴胺溶于碱性水溶液中,得到溶液A;取高铁酸钾溶于碱性水溶液中,得到溶液B;(2)将B溶液缓慢加入到A溶液中,在磁力搅拌下反应一定时间;(3)反应结束后,冷却、过滤,冷冻干燥至恒重,得到聚多巴胺产物。
本发明以高铁酸钾氧化合成聚多巴胺的方法主要为溶液氧化方法,该制备方法操作简单、效率高,且得到的聚多巴胺纳米粒子为球状,粒径大小可控,稳定性好。
优选的,上述制备方法的具体步骤如下:
称取0.001~0.12mol的盐酸多巴胺(DA·HCl)溶于5~500mL的碱性水溶液中,得到溶液A;称取0.001~0.012mol的高铁酸钾(K2FeO4)溶于5~500mL的碱性水溶液,得到溶液B;将溶液B缓慢加入到溶液A中,磁力搅拌,保持转速为1500~5000r·min-1,反应温度为0~70℃,反应时间5~40分钟;反应结束后经减压过滤,并用蒸馏水洗涤3~5次,得到的沉淀经冷冻干燥至恒重,得到聚多巴胺产物。
在本发明中,高铁酸钾作为氧化剂,绿色无毒、可回收利用,达到绿色环保的目的。通过该方法,聚多巴胺可快速制备,产率最高达到94%以上,且得到的聚多巴胺纳米粒子粒径可控,稳定性和分散性好。
在上述反应中,反应介质是蒸馏水,即各原料溶液的溶剂采用蒸馏水,溶剂体系环境友好,不会带来二次污染。
优选的,所述碱性水溶液可以采用三羟甲基氨基甲烷缓冲(Tris-buffer)溶液、NaOH溶液或氨水溶液。
优选的,在本发明的实验条件下,制备得到的聚多巴胺为纳米粒子,直径在50-200nm之间,产率最高达94%。
该方法的优点在于采用环境友好的溶剂和氧化剂,达到快速高效制备聚多巴胺的目的,产率高,并根据聚合条件的选择,可以得到大小尺寸可控的聚多巴胺纳米粒子,纳米粒径的直径小于200nm。这为制备聚多巴胺双亲性复合物、智能涂料提供了良好的平台,在海洋防腐和防污领域的应用前景广阔。
附图说明
图1是聚多巴胺红外光谱图;
图2是聚多巴胺SEM图。
具体实施方式
以下结合具体实施例对本发明做进一步详述,但本发明的技术范围不受这些实施例限定。
实施例1
本实施例中聚多巴胺的制备方法具体步骤如下:
(1)称取6.057g三羟甲基氨基甲烷于烧杯中,加适量蒸馏水溶解,转移至1L容量瓶,定容,得到pH为8.5的Tris-buffer溶液;称取11.376g DA·HCl溶于400mL的Tris-buffer溶液,得到溶液A;称取1.188g K2FeO4溶于100mL的Tris-buffer溶液,得到溶液B;将溶液B滴加至溶液A中,磁力搅拌,保持转速为1500r·min-1,反应温度为25℃,反应过程中,反应混合液由紫红色逐渐变为黑色,反应40分钟后,停止搅拌。
(2)将反应混合液减压过滤,用蒸馏水洗涤沉淀3次,冷冻干燥至恒重,得到聚多巴胺产物,产率为87%,聚多巴胺纳米粒子直径约100nm。
聚多巴胺的红外光谱图如图1。
实施例2
本实施例中聚多巴胺的制备方法具体步骤如下:
(1)称取6.057g三羟甲基氨基甲烷于烧杯中,加适量蒸馏水溶解,转移至1L容量瓶,定容,得到pH为8.5的Tris-buffer溶液;称取0.1896g DA·HCl溶于15mL的Tris-buffer溶液,得到溶液A;称取0.0990g K2FeO4溶于5mL的Tris-buffer溶液,得到溶液B;将溶液B滴加至溶液A中,磁力搅拌,保持转速为1500r·min-1,反应温度为0℃,反应过程中,反应混合液由紫红色逐渐变为黑色,反应5分钟后,停止搅拌。
(2)将反应混合液减压过滤,用蒸馏水洗涤沉淀5次,再冷冻干燥至恒重,得到聚多巴胺产物,产率为80%,聚多巴胺纳米粒子直径约170nm。
实施例3
本实施例中聚多巴胺的制备方法具体步骤如下:
(1)称取0.3792g DA·HCl溶于35mL的NaOH溶液(pH=8.5)溶液,得到溶液A;称取0.0990g K2FeO4溶于5mL的NaOH溶液(pH=8.5),得到溶液B;将溶液B滴加至溶液A中,磁力搅拌,保持转速为1500r·min-1,反应温度为25℃,反应过程中,反应混合液由紫红色逐渐变为黑色,反应40分钟后,停止搅拌。
(2)将反应混合液减压过滤,用蒸馏水洗涤沉淀3次,再冷冻干燥至恒重,得到聚多巴胺产物,产率为93%,聚多巴胺纳米粒子直径约60nm。
实施例4
本实施例中聚多巴胺的制备方法具体步骤如下:
(1)称取11.376g DA·HCl溶于400mL的氨水溶液(pH=8.5),得到溶液A;称取1.188g K2FeO4溶于100mL的氨水溶液(pH=8.5),得到溶液B;将溶液B滴加至溶液A中,搅拌,保持转速为1500r·min-1,反应温度为25℃,反应过程中,反应混合液由紫红色逐渐变为黑色,反应40分钟后,停止搅拌。
(2)将反应混合液减压过滤,用蒸馏水洗涤沉淀5次,再冷冻干燥至恒重,得到聚多巴胺产物,产率为89%,聚多巴胺纳米粒子直径约50nm。
实施例5
本实施例中聚多巴胺的化学制备方法具体步骤如下:
(1)称取0.0948g DA·HCl溶于5mL的Tris-buffer溶液,得到溶液A;称取0.0990gK2FeO4溶于5mL的氨水溶液(pH=8.5),得到溶液B;将溶液B滴加至溶液A中,磁力搅拌,保持转速为5000r·min-1,反应温度为70℃,反应过程中,反应混合液由紫红色逐渐变为黑色,反应40分钟后,停止搅拌;
(2)将反应混合液减压过滤,用蒸馏水洗涤沉淀5次,再冷冻干燥至恒重,得到聚多巴胺产物,产率为94%,聚多巴胺纳米粒子直径约50nm。
聚多巴胺的SEM如图2。
Claims (4)
1.一种大小可控的纳米聚多巴胺的制备方法,其特征在于,它的步骤如下:
称取0.001~ 0.12mol的盐酸多巴胺溶于5~500mL的碱性水溶液中,得到溶液A;称取0.001~0.012mol的高铁酸钾(K2FeO4)溶于5~500mL的碱性水溶液,得到溶液B;将溶液B缓慢加入到溶液A中,磁力搅拌,保持转速为1500~5000 r· min-1,反应温度为0~70℃,反应时间5~40分钟;反应结束后经减压过滤,并用蒸馏水洗涤3~5次,得到的沉淀经冷冻干燥至恒重,得到聚多巴胺产物。
2.根据权利要求1所述的制备方法,其特征在于,所述的碱性水溶液采用三羟甲基氨基甲烷缓冲(Tris-buffer)溶液、NaOH溶液或氨水溶液。
3.根据权利要求1所述的制备方法,其特征在于,制备得到的聚多巴胺为纳米粒子,直径在50-200nm之间。
4.根据权利要求1所述的制备方法,其特征在于,产率为80%~94%。
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