BACKGROUND The addition of nanoparticles to cellulose paper can improve its mechanical strength, chemical stability, biocompatibility and hydrophobic properties. Silica nanoparticles are known to be inert, hydrophobic, biocompatible, biodegradable and have a good distribution in being deposited on surfaces. The main characteristics of 20 nm SiO2 nanoparticles are good chemical and thermal stability with a melting point of 1610-1728°3C, a boiling point of 2230°C with a purity of 99.5%. OBJECTIVE To carry out the hydrophobization of paper based on Kraft cellulose and on cellulose obtained from soybean husk with 20-nm size SiO2 nanoparticles and to study hydrophobicity, morphology and topography of the prepared composites. METHODS The ground and roasted soybean husk was treated with a NaOH, washed and dried. Hydrophobization of paper was carried in aqueous medium by SiO2 addition in weight ratios "paper-SiO2" of 0.01-0.05 wt.%, stirring, filtration and drying. The obtained cellulose sheet composites were characterized by Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), FTIRspectroscopy, Mullen proofs of hydrophobicity, and contact angle measurements. RESULTS The mechanical properties of paper nanocomposites (tensile strength and compression) increased considerably by varying the concentrations. The tensile strength increased by 41-46% and the compressive strength increased by 55-56%. The existence of fiber nanofoils, good adhesion of 20-nm SiO2 nanoparticles to the paper surface, and their homogeneous distribution were observed. CONCLUSION Cellulose was successfully obtained from soybean husk, applying the alkaline-based extraction method. A good reinforcement of cellulose fibers is observed due to the outstanding characteristics of the silicon dioxide nanoparticles.

中文翻译：

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在超声场中从大豆皮获得的牛皮纸型纤维素和超细纤维纤维素的疏水化作用。

背景技术向纤维素纸中添加纳米颗粒可以改善其机械强度，化学稳定性，生物相容性和疏水性。已知二氧化硅纳米粒子是惰性的，疏水的，生物相容的，可生物降解的，并且在沉积在表面上时具有良好的分布。20 nm SiO2纳米颗粒的主要特征是良好的化学和热稳定性，熔点为1610-1728°3C，沸点为2230°C，纯度为99.5％。目的对硫酸盐制得的牛皮纸和大豆皮中的纤维素（粒径为20nm的SiO2纳米颗粒）进行纸质疏水化处理，研究其复合材料的疏水性，形态和形貌。方法将磨碎的烤大豆皮用NaOH处理，洗涤并干燥。通过在水介质中通过以0.01-0.05重量％的“纸-SiO 2”的重量比添加SiO 2进行纸的疏水化，搅拌，过滤和干燥。通过扫描电子显微镜（SEM），透射电子显微镜（TEM），FTIR光谱，疏水性的Mullen证明和接触角测量来表征获得的纤维素片状复合材料。结果通过改变浓度，纸纳米复合材料的机械性能（抗张强度和压缩强度）显着提高。拉伸强度增加了41-46％，抗压强度增加了55-56％。观察到纤维纳米箔的存在，20 nm SiO2纳米颗粒与纸张表面的良好粘合性以及它们的均匀分布。结论纤维素是从大豆皮中成功获得的，应用碱性提取方法。由于二氧化硅纳米颗粒的优异特性，观察到纤维素纤维的良好增强。