Gupta Surabhi, Singh Ankit, Matsumi Noriyoshi
School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923 1292, Japan.
ACS Omega. 2019 Dec 3;4(25):20923-20930. doi: 10.1021/acsomega.9b01826. eCollection 2019 Dec 17.
We have synthesized a series of poly(-isopropylacrylamide/ionic liquid) with deposited Au nanoparticles. The size of the nanoparticle range was varied from 10 to 35 nm, and these were characterized by transmission electron microscopy analysis. Ionic liquids (IL) were chosen by varying the polymerizable unit to be both in cationic (allyl) and anionic (acrylate) moiety. One-pot polymerization was done with -isopropylacrylamide and IL using ammonium persulphate as the initiator, to which were added already prepared Au NPs. These thermally sensitive composites formed, possessed reversible swelling/deswelling abilities in water, and demonstrated a reversible visible phase transition, which was detected by differential scanning calorimetric measurements. The lower critical solution temperature (LCST) showed dependency on the size of nanoparticles and the IL independently. It was seen that the LCST of PNIPAM-based composite films can be tuned from 32 °C to a range of 23-67 °C by choosing the desired Au NP size, its concentration and kind of IL.
我们合成了一系列负载金纳米颗粒的聚（-异丙基丙烯酰胺/离子液体）。纳米颗粒的尺寸范围在10到35纳米之间，通过透射电子显微镜分析对其进行了表征。通过改变可聚合单元，使其同时存在于阳离子（烯丙基）和阴离子（丙烯酸酯）部分来选择离子液体（IL）。以过硫酸铵为引发剂，将-异丙基丙烯酰胺和离子液体进行一锅法聚合，并向其中加入已制备好的金纳米颗粒。形成的这些热敏复合材料在水中具有可逆的溶胀/去溶胀能力，并表现出可逆的可见相转变，通过差示扫描量热法测量检测到了这种转变。较低临界溶液温度（LCST）分别独立地取决于纳米颗粒的尺寸和离子液体。可以看出，通过选择所需的金纳米颗粒尺寸、其浓度和离子液体种类，基于聚N-异丙基丙烯酰胺的复合膜的LCST可以从32℃调节到23 - 67℃的范围。
