Sulym Iryna, Goncharuk Olena, Sternik Dariusz, Terpilowski Konrad, Derylo-Marczewska Anna, Borysenko Mykola V, Gun'ko Vladimir M
Chuiko Institute of Surface Chemistry, National Academy of Science of Ukraine, 17 General Naumov Street, 03164, Kiev, Ukraine.
Department of Physicochemistry of Solid Surface, Faculty of Chemistry, Maria Curie-Sklodowska University, M. Curie-Sklodowska Sq. 3, 20-031, Lublin, Poland.
Nanoscale Res Lett. 2017 Dec;12(1):152. doi: 10.1186/s11671-017-1935-x. Epub 2017 Feb 27.
SiO@PDMS and CeO-ZrO-SiO@PDMS nanocomposites were prepared and studied using nitrogen adsorption-desorption, Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), measurements of advancing and receding contact angles with water, and microcalorimetry. The pore size distributions indicate that the textural characteristics change after oxide modification by poly(dimethylsiloxane) (PDMS). Composites are characterized by mainly mesoporosity and macroporosity of aggregates of oxide nanoparticles or oxide@PDMS nanoparticles and their agglomerates. The FT-IR spectra show that PDMS molecules cover well the oxide surface, since the intensity of the band of free silanols at 3748 cm decreases with increasing PDMS concentration and it is absent in the IR spectrum at C ≥ 20 wt% that occurs due to the hydrogen bonding of the PDMS molecules to the surface hydroxyls. SEM images reveal that the inter-particle voids are gradually filled and aggregates are re-arranged and increase from 20 to 200 nm in size with the increasing polymer concentration. The highest hydrophobicity (contact angle θ = 140° at C = 20-40 wt%) is obtained for the CeO-ZrO-SiO@PDMS nanocomposites. The heat of composite immersion in water shows a tendency to decrease with increasing PDMS concentration.
制备了SiO@PDMS和CeO-ZrO-SiO@PDMS纳米复合材料，并使用氮气吸附-脱附、傅里叶变换红外光谱（FT-IR）、扫描电子显微镜（SEM）、测量水的前进和后退接触角以及微量量热法对其进行了研究。孔径分布表明，用聚二甲基硅氧烷（PDMS）进行氧化物改性后，结构特征发生了变化。复合材料的特征主要在于氧化物纳米颗粒或氧化物@PDMS纳米颗粒及其团聚体聚集体的介孔和大孔。FT-IR光谱表明，PDMS分子很好地覆盖了氧化物表面，因为随着PDMS浓度的增加，3748 cm处游离硅醇的谱带强度降低，并且在C≥20 wt%的红外光谱中由于PDMS分子与表面羟基的氢键作用而不存在该谱带。SEM图像显示，随着聚合物浓度的增加，颗粒间空隙逐渐被填充，聚集体重新排列，尺寸从20 nm增加到200 nm。对于CeO-ZrO-SiO@PDMS纳米复合材料，获得了最高的疏水性（在C = 20-40 wt%时接触角θ = 140°）。复合材料在水中的浸入热显示出随着PDMS浓度增加而降低的趋势。
