Electrical and Thermal Transport in CaCO3 Graphene Nanocomposites Derived from Oyster Shell Waste
6 affiliations
- 1University of Bologna , ”, , ”, ”, , Via Piero Gobetti 85 , ,
- 2University of Trento , , Via Sommarive 9 , ,
- 3University of Bologna , , Via F. Selmi 3 , ,
- 4The Inter-Institute Center for Research on Marine Biodiversity, Resources and Biotechnologies , , Viale Adriatico 1/N , ,
- 5Istituto per lo Studio dei Materiali Nanostrutturati (CNR-ISMN) , , Via P. Gobetti 101 , ,
- 6University of Bologna , , ,
Abstract
Waste oyster shells provide a calcium carbonate, as Mg-calcite, feedstock for functional mineral composites. Here, shell-derived biogenic calcium carbonate (BCC) and few-layer graphene (FLG; nominally 1, 5, 7, and 10 wt % relative to BCC) were processed by aqueous planetary ball milling with Pluronic P123. Microscopy, diffraction, spectroscopy, thermogravimetry, and transport measurements were combined to examine the resulting powders and pressed pellets. Mg-calcite nanocrystallites and graphene sheets coexisted within micrometer-scale aggregates, with mineral particles preferentially observed near sheet edges. At 25 °C, the thermal conductivity of the 10 wt % formulation was 0.516 W·m–1·K–1, compared with 0.194 W·m–1·K–1 for the dry-milled shell. This approximately 166% reference-to-composite difference combines changes in composition and processing and cannot be assigned to FLG addition alone. Stable electrical measurements were obtained from 5 wt % FLG; the reported resistivity of the 10 wt % formulation was approximately 0.50 Ω·cm. The shell organic matrix may contribute to interfacial interactions, although its effect cannot be distinguished from those of Pluronic and processing in the present experiments. The observed transport differences among the prepared formulations provide a basis for future studies using matched processing controls to clarify the contribution of each constituent.
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BibTeX
@article{marchini2026electrical,
title = {{Electrical and Thermal Transport in CaCO3 Graphene Nanocomposites Derived from Oyster Shell Waste}},
author = {Chiara Marchini and Giulia Fredi and Stefano Goffredo and Alessandro Gradone and Andrea Migliori and Simona Fermani and Giuseppe Falini and Devis Montroni},
journal = {ACS Omega},
year = {2026},
month = oct,
doi = {10.1021/acsomega.6c09705},
url = {https://pubs.acs.org/acsodf/article/doi/10.1021/acsomega.6c09705/5454974/Electrical-and-Thermal-Transport-in-CaCO3-Graphene},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Electrical and Thermal Transport in CaCO3 Graphene Nanocomposites Derived from Oyster Shell Waste
AU - Chiara Marchini
AU - Giulia Fredi
AU - Stefano Goffredo
AU - Alessandro Gradone
AU - Andrea Migliori
AU - Simona Fermani
AU - Giuseppe Falini
AU - Devis Montroni
PY - 2026
DA - 2026/10/21
JO - ACS Omega
DO - 10.1021/acsomega.6c09705
UR - https://pubs.acs.org/acsodf/article/doi/10.1021/acsomega.6c09705/5454974/Electrical-and-Thermal-Transport-in-CaCO3-Graphene
AB - Waste oyster shells provide a calcium carbonate, as Mg-calcite, feedstock for functional mineral composites. Here, shell-derived biogenic calcium carbonate (BCC) and few-layer graphene (FLG; nominally 1, 5, 7, and 10 wt % relative to BCC) were processed by aqueous planetary ball milling with Pluronic P123. Microscopy, diffraction, spectroscopy, thermogravimetry, and transport measurements were combined to examine the resulting powders and pressed pellets. Mg-calcite nanocrystallites and graphene sheets coexisted within micrometer-scale aggregates, with mineral particles preferentially observed near sheet edges. At 25 °C, the thermal conductivity of the 10 wt % formulation was 0.516 W·m–1·K–1, compared with 0.194 W·m–1·K–1 for the dry-milled shell. This approximately 166% reference-to-composite difference combines changes in composition and processing and cannot be assigned to FLG addition alone. Stable electrical measurements were obtained from 5 wt % FLG; the reported resistivity of the 10 wt % formulation was approximately 0.50 Ω·cm. The shell organic matrix may contribute to interfacial interactions, although its effect cannot be distinguished from those of Pluronic and processing in the present experiments. The observed transport differences among the prepared formulations provide a basis for future studies using matched processing controls to clarify the contribution of each constituent.
SN - 2470-1343
ER -