TY - JOUR
T1 - Investigation of dielectric properties of starch nanoparticles derived from arrowroot (Maranta arundinaceae L.) rhizomes
AU - Ramya, M.
AU - Ramanarayanan, Rajita
AU - Muthu, S. Esakki
AU - Kannan, Karthik
AU - Sahadevan, Jhelai
AU - Dinesh, A.
AU - Gnanasekaran, Lalitha
AU - Ayyar, Manikandan
AU - Santhoshkumar, S.
N1 - Publisher Copyright:
© 2025 The Authors
PY - 2025/7
Y1 - 2025/7
N2 - This study presents a novel, green approach to tailoring the dielectric properties of starch by mechanical means alone, without chemical modification. The correlation between ball milling-induced structural changes and dielectric performance is reported for the first time using native arrowroot starch, highlighting its potential as a sustainable material for eco-friendly electronic applications. The structure and characteristics of starch granules are drastically changed by ball milling. Ball milling reduces granule size and produces irregular, porous structures by destroying the spherical or oval geometry of raw starch (SR), according to SEM pictures. The XRD study reveals decrease of crystallinity from 28 % (SR) to 13 % (milled starch, SM), and the peaks that were typical of A-type starch vanished, signifying amorphization. The binding energies of the C1s and O1s peaks fluctuate in the XPS measurements, indicating oxidation state alterations and bond rupture. Raman spectroscopy, which shows a weakening of vibrational signals, further validates structural amorphization. Due to structural disturbance and decreased interfacial polarisation, dielectric measurements reveal decreased impedance, dielectric constant, and loss factor for SM. Due to higher resistance, SM has lesser electrical conductivity than SR. With SM showing a wider semicircle, which denotes more resistance and decreased charge carrier mobility, the Cole-Cole plot shows changed relaxation behaviour.
AB - This study presents a novel, green approach to tailoring the dielectric properties of starch by mechanical means alone, without chemical modification. The correlation between ball milling-induced structural changes and dielectric performance is reported for the first time using native arrowroot starch, highlighting its potential as a sustainable material for eco-friendly electronic applications. The structure and characteristics of starch granules are drastically changed by ball milling. Ball milling reduces granule size and produces irregular, porous structures by destroying the spherical or oval geometry of raw starch (SR), according to SEM pictures. The XRD study reveals decrease of crystallinity from 28 % (SR) to 13 % (milled starch, SM), and the peaks that were typical of A-type starch vanished, signifying amorphization. The binding energies of the C1s and O1s peaks fluctuate in the XPS measurements, indicating oxidation state alterations and bond rupture. Raman spectroscopy, which shows a weakening of vibrational signals, further validates structural amorphization. Due to structural disturbance and decreased interfacial polarisation, dielectric measurements reveal decreased impedance, dielectric constant, and loss factor for SM. Due to higher resistance, SM has lesser electrical conductivity than SR. With SM showing a wider semicircle, which denotes more resistance and decreased charge carrier mobility, the Cole-Cole plot shows changed relaxation behaviour.
KW - Arrowroot
KW - Conductivity
KW - Dielectric
KW - Impedance
KW - Raman spectroscopy
KW - Starch
UR - https://www.scopus.com/pages/publications/105005960789
U2 - 10.1016/j.rechem.2025.102348
DO - 10.1016/j.rechem.2025.102348
M3 - Article
AN - SCOPUS:105005960789
SN - 2211-7156
VL - 16
JO - Results in Chemistry
JF - Results in Chemistry
M1 - 102348
ER -