Developing Self-Assembled Starch Nanoparticles in Starch Nanocomposite Films

Abstract

Starch nanoparticles (SNPs) are synthesized by different precipitation techniques using corn starch, and SNP films are prepared by the evaporation casting method. The morphological study is investigated by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The distribution and sizes of precipitated SNPs after synthesizing are discovered by these methods as well. The crystallinity of the SNPs is studied by the X-ray diffractometry (XRD) method that demonstrates reduction compared to neat starch granules, and it is changed from A-style to V H -style after precipitation. The chemical bonding of different SNPs after the nanoprecipitation is analyzed by Fourier transform infrared spectroscopy (FT-IR). Thermogravimetric analysis (TGA) demonstrates the decomposition of starch nanoparticles and the starch matrix that is related to the depolymerization of carbon chains in the range of 260 to 350 °C. The mechanical properties of the SNP films versus the temperature changing are discovered by dynamic mechanical analysis (DMA). The water contact angles of SNP films are measured using a goniometer, and the results showed the hydrophobic surfaces of the prepared films. Our study indicates that SNPs have a promising impact on the properties of corn starch films, which would be useful in biodegradable packaging material.

Starch-Directed Synthesis of Worm-Shaped Silica Microtubes

“…Soluble starch contains a high percentage of linear amylose, which governs its properties [ 33 ]. We infer that worms arise first from self-assembly of the starch /amylose upon cooling, as eloquently described by Caruso et al [ 20 ] and others [ 34 ], and transesterification with silanes, which is expected to be a slow process at these temperatures. Over time, glycerol is partly or completely displaced by starch to give a starch–silica matrix embedded with worms ( Figure 7 C).…”

Lignin beyond the status quo: recent and emerging composite applications

“…In the case of bio-based fillers, not only can the properties of the polymers be improved, but also their sustainability, green content, and carbon footprint. 142,143 Lignin, in particular, has gained significant attention in recent decades due to its unique chemical structure that can be modified through various methods, its availability, its strong effect as reinforcement material, biodegradability, and renewability. 144…”

Physical Properties of Thermoplastic Cornstarch/Hibiscus sabdariffa Fiber Obtained by Evaporation Casting

“…[ 16 ] Obtaining composite materials from thermoplastic cornstarch reinforced with cellulose fibers through the compression molding technique has also been investigated, with study results verifying the interaction between natural fibers and the starch matrix. [ 17 ]…”

“…[16] Obtaining composite materials from thermoplastic cornstarch reinforced with cellulose fibers through the compression molding technique has also been investigated, with study results verifying the interaction between natural fibers and the starch matrix. [17] Natural fiber composites offer an attractive avenue for environmental waste management, which is why these technologies have received much attention. [18,19] Natural fibers are renewable, biodegradable, and used as reinforcement in green composite materials with properties comparable to those developed from fibers of mineral origin.…”