Preparation and characterization of amphiphilic starch nanocrystals

Song, Shiwei; Cai, Wei; Pan, Zelin; Wang, Xiufen

doi:10.1002/app.27076

Cited by 76 publications

(50 citation statements)

References 18 publications

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“…For example, Battista prepared starch crystals of sizes varying from nano to micron size by dispersing starch granules into HCl. During acidic treatment, the amorphous region of starch is hydrolyzed and removed, whereas the crystalline part is converted to starch crystals of different sizes (Song et al 2008). Angellier et al (2004) optimized the method and produced starch crystals by H 2 SO 4 treatment within five days.…”

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confidence: 99%

Preparation and Characterization of Starch Particles for Use in Pickering Emulsions

et al. 2016

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Cereal Chem. 93(2):116-124Particle-stabilized emulsions, called Pickering emulsions, can be produced by using starch particles. In this work we studied how the properties of the starch particles affect the droplet size and creaming of such emulsions. In the study, various sizes of starch particles were generated by two different methods and used to stabilize Pickering emulsions. Sedimentation according to Stokes' law was used to separate small and large starch granules. Acid hydrolysis was another method used to obtain smaller particles. All samples were modified with octenyl succinic anhydride (OSA) to increase their hydrophobicity with a level of OSA substitution between 1.8 and 3.1%. The size of starch particles was the main factor influencing emulsion droplet sizes. Furthermore, the droplet size decreased as the starch concentration increased. Using small starch particles with sizes <10 µm produced stable emulsions with smaller droplet size compared with larger sizes of starch particles, >10 µm. When subjected to acid hydrolysis, smaller starch particles were generally obtained, which could subsequently create smaller emulsion droplets. The emulsion index increased for the acid-hydrolyzed starch owing to the size reduction of starch particles. The shape of the starch seemed to have a minor impact on the droplet size and the creaming of Pickering emulsions.

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confidence: 99%

Preparation and Characterization of Starch Particles for Use in Pickering Emulsions

et al. 2016

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“…Polystyrene was also grafted on starch nanocrystals using a "grafting from" strategy (Song et al, 2008). Amphiphilic starch nanocrystals prepared by the graft copolymerization of starch nanocrystals with styrene were well dispersed both in polar and nonpolar solvents (Song et al, 2008). The surface coating of the nanoparticles allowed dispersion in organic solvents and compatibilization with apolar polymeric matrices.…”

Section: Surface Chemical Modificationmentioning

confidence: 99%

11 Other polysaccharide nanocrystals

Dufresne¹

2012

Nanocellulose

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Apart from cellulose, nanoparticles can be extracted from other semicrystalline polysaccharides, such as starch and chitin. A process similar to the one used to prepare cellulose nanocrystals involving acid hydrolysis of amorphous domains of the polysaccharide followed by a mechanical treatment can be applied to these polymers to release the crystalline domains. Recent review papers have been published on starch nanoparticles (Le Corre et al., 2010) and chitin nanocrystals (Zeng et al., 2012). Although less studied than cellulosic nanoparticles, they can offer specific properties because of their different morphology and chemical composition.

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“…Fortunately, starch nanocrystals have reactive surfaces suitable for chemical derivation and grafting reactions. [13][14][15][16] Such modification would facilitate the dispersion of starch nanocrystals, manipulate the hydrophobicity of surface, and improve the miscibility between the starch nanocrystals and the polymer matrix. Particularly, grafting produces long tails on the surface of starch nanocrystals which may penetrate into the polymer matrix and exert a stronger interfacial interaction.…”

Section: Introductionmentioning

confidence: 99%

Effects of starch nanocrystal‐graft‐polycaprolactone on mechanical properties of waterborne polyurethane‐based nanocomposites

Chang

Chen

et al. 2008

J of Applied Polymer Sci

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Based on a ''graft from'' strategy, the surface of starch nanocrystals (StN) were functionalized by grafting with polycaprolactone (PCL) chains via microwave assisted ring-opening polymerization (ROP). The modified natural nanoparticles were then compounded into a PCL-based waterborne polyurethane as matrix. The structural and mechanical properties of the WPU/StN-g-PCL nanocomposites were characterized by XRD, FTIR, SEM, DSC, DMA, and tensile testing. It was interesting to note that a loading-level of 5 wt % StN-g-PCL resulted in a simultaneous enhancement of tensile strength and elongation at break, both of which were higher than those of neat WPU. This enhancement was attributed to the uniform dispersion of StN-g-PCL because of its nano-scale size, the increased entanglements mediated with grafted PCL chains, and the reinforcing function of rigid StN. Increasing the StN-g-PCL content however caused the StN-g-PCL to self-aggregate as crystalline domains, which impeded improvement in tensile strength and elongation at break, but significantly enhanced Young's modulus.

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Preparation and characterization of amphiphilic starch nanocrystals

Cited by 76 publications

References 18 publications

Preparation and Characterization of Starch Particles for Use in Pickering Emulsions

Preparation and Characterization of Starch Particles for Use in Pickering Emulsions

11 Other polysaccharide nanocrystals

Effects of starch nanocrystal‐graft‐polycaprolactone on mechanical properties of waterborne polyurethane‐based nanocomposites

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