TY - JOUR
T1 - Relative permittivity estimation of wheat starch
T2 - A critical property for understanding electrostatic hazards
AU - Seidel, J. V.
AU - Castañeda-Uribe, O. A.
AU - Arevalo, S.
AU - Muñoz, F.
AU - Proud, W.
AU - Avila, A.
N1 - Funding Information:
J.V. Seidel would like to gratefully acknowledge the financial support of the German Academic Scholarship Foundation (Studienstiftung des Deutschen Volkes) . The Institute of Shock Physics acknowledges the support of AWE, Aldermaston and Imperial College London. In addition, the authors affiliated with the Universidad de los Andes appreciate the financial support of the vice presidency for Research: programa de proyectos de investigación 2014 (106).
Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/4/15
Y1 - 2019/4/15
N2 - Wheat starch is a widely used material in the food, pharmaceutical and entertainment industry not considered hazard but recently associated to dust explosions during processing and handling. How an insulating starch grain is charged and how its ability to be polarized is affected by environmental conditions such as temperature, humidity and frequency? are fundamental questions that must be explored in order to understand the dust explosion phenomena. Here we investigate the dependence of temperature, humidity and low-frequency on the relative permittivity of wheat starch. We characterized starch at the micro and macro scales using atomic force microscopy-based techniques and capacitive planar sensor-based measurements respectively. The results show high values of permittivity (˜80) at the microscale (single starch grains) compared to the low values (10–20) at the macroscale (20 mg of wheat starch). The differences are attributed to the Maxwell–Wagner–Sillars interfacial polarization process on individual grains and potential charge exchange between grains. Permittivity is a critical property to investigate starch electrostatic hazards.
AB - Wheat starch is a widely used material in the food, pharmaceutical and entertainment industry not considered hazard but recently associated to dust explosions during processing and handling. How an insulating starch grain is charged and how its ability to be polarized is affected by environmental conditions such as temperature, humidity and frequency? are fundamental questions that must be explored in order to understand the dust explosion phenomena. Here we investigate the dependence of temperature, humidity and low-frequency on the relative permittivity of wheat starch. We characterized starch at the micro and macro scales using atomic force microscopy-based techniques and capacitive planar sensor-based measurements respectively. The results show high values of permittivity (˜80) at the microscale (single starch grains) compared to the low values (10–20) at the macroscale (20 mg of wheat starch). The differences are attributed to the Maxwell–Wagner–Sillars interfacial polarization process on individual grains and potential charge exchange between grains. Permittivity is a critical property to investigate starch electrostatic hazards.
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U2 - 10.1016/j.jhazmat.2019.01.047
DO - 10.1016/j.jhazmat.2019.01.047
M3 - Article
C2 - 30682542
AN - SCOPUS:85060208224
SN - 0304-3894
VL - 368
SP - 228
EP - 233
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
ER -
