Fabrication of copper- and silver-coated triply periodic minimal surface structures through 3D printing, electroplating and electroless processes
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
This research presents an innovative approach that offers an accessible method for directly coating metallic layers onto 3D-printed parts for point-of-use (POU) water treatment applications. This provides more control over the final geometry while concentrating the disinfecting agent on the surface—rather than using a massive piece—ensuring effective treatment while reducing material costs and minimizing waste of expensive metallic resources. TPMS (Triply Periodic Minimal Surface) infill meshes were generated via a Schwarz P function coded in Python and then fabricated with a commercial-grade PLA-based composite filament with conductive properties. This made the electrochemical deposition of copper ions onto the printed infill surfaces possible via a DC-powered electroplating process. Initially, four different approaches were tested under four different electrolyte bath concentrations—sixteen experiments (four under static conditions and twelve under agitation)—with the outcomes evaluated through visual inspection, digital microscopy, and scanning electron microscopy (SEM), which was also used as a tool for quantifying the fraction of the surface area with metal deposition. Energy-dispersive spectroscopy (EDS) and ImageJ-based surface quantification were employed to validate coating composition and coverage. The optimal electroplating conditions were then refined by incorporating a postprint annealing treatment and reconfiguring the disposition of the components to enhance coating uniformity. The deposition process was monitored by measuring the electric current, allowing for the quantification of copper mass deposited through Faraday’s law of electrolysis. Finally, a silver-over-copper (Ag@Cu) deposition was successfully performed, with the resulting silver mass assessed via inductively coupled plasma‒mass spectrometry (ICP‒MS). Application tests demonstrated >99% disinfection efficiency against E. coli within a calculated exposure of minutes, with statistical analysis confirming the significance of bacterial reduction, and ICP-MS assessing minimal metal leaching, supporting the safety and durability of the system. The results confirm that the proposed methodology not only achieves a homogeneous metallic coating on complex TPMS structures but also provides a durable, scalable and reproducible solution for developing effective water treatment devices tailored for local farmers and isolated areas.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it