Historical research guide · 0689 · 2024
Nanomaterials engineering for enhanced low energy nuclear reactions: a comprehensive review and future prospects
Nurlan Bakranov · Zhanserik Kuli · David Nagel · Dina Bakranova
In one minute
Bakranov, Kuli, Nagel and Bakranova survey what the material itself contributes to low energy nuclear reactions — the field that began with Fleischmann and Pons and has since accumulated a large experimental record. Their argument is that the reaction is a materials problem before it is a nuclear one. Shrink palladium, nickel or their alloys to the nanoscale and you gain enormous surface area, faster hydrogen uptake and quantisation effects that change how electrons and implanted ions behave inside the cluster. The review then walks the theories, from collective electromagnetic effects that let electrons combine with protons, to Bose-Einstein condensation of deuterons, to defect and vacancy engineering — and the experiments, including nickel-copper multilayer composites releasing about 1.1 MJ at roughly 16 keV per hydrogen atom, dual-laser stimulation of palladium cathodes producing excess heat in 161 runs out of 170, and constantan wires driven by high-voltage pulses. The named remaining problem is reliable, repeatable activation.
Connection
Chapter 12 argues that the barrier a nucleus faces is set by its environment, and this review is the materials-side statement of that argument: the lattice, the vacancies, the particle size and the drive waveform are the engineering variables. It also names the honest bottleneck — reproducible activation — and the concrete programme for closing it.
From the source
The energy released in these experiments is far above anything chemistry can supply: nanosized multilayer nickel-copper composites loaded with hydrogen reached a maximum of about 1.1 MJ, averaging roughly 16 keV per hydrogen atom or 1.5 GJ per mole of hydrogen, and multilayer nickel composites reached values above 10 keV per hydrogen atom, with no accompanying gamma rays or neutrons.Section 3, Experiment (Iwamura et al., 2020; Iwamura et al., 2024)
Nanostructure is the control variable rather than a detail: nanoparticles present the large surface area that lets a solid absorb far more hydrogen, quantisation effects emerge as particle size falls and can modify the interaction of quasiparticles within nanoclusters, and palladium-rhodium alloys show accelerated hydrogen uptake kinetics in nanoparticle form compared with bulk material.Abstract; Section 1, Introduction
Defects in the crystal are treated as catalysts: structurally activated vacancies in palladium — the named deuterium-vacancy phases — significantly alter the structural and electronic properties of the metal, and structural defects raise hydrogen density in face-centred cubic metals such as nickel and lower the energy threshold needed to initiate the reaction by changing electron density and local electric fields in the lattice.Section 3, Experiment (Staker, 2020; Nee et al., 2019; Sinha, 2015)
How the material is driven changes the output: microsecond high-voltage, high-power pulses stimulate hydrogen electromigration in constantan wires and release excess energy; nanosecond pulse stimulation raises both the absolute power generated and the performance ratio, with frequent low-voltage pulses more efficient than less frequent high-voltage pulses; and dual-laser stimulation of deuterium-loaded palladium cathodes at 8, 15 and 20 terahertz produced excess heat above the laser input in 161 of 170 cases.Section 3, Experiment (Celani et al., 2022; Tanzella et al., 2019; Letts, 2015)
One reviewed mechanism unifies metal hydride cells, exploding wires and the solar corona under a single description: under conditions that are now clearly defined, electromagnetic energy is used collectively, giving a specific portion of the electrons enough kinetic energy to combine with protons or other ions to produce neutrons through the weak interaction, and those neutrons then combine with other nuclei to drive low energy reactions and transmutations — with no new physics beyond the standard model required to accelerate the electrons.Section 1, Introduction (Srivastava et al., 2010)
The open problem the review names is activation, not evidence: despite substantial experimental evidence and theoretical development, reproducibility and reliable activation mechanisms remain the challenge, and the stated programme for closing it is refining synthesis techniques for nanostructures, exploring novel alloys, and integrating machine learning models to predict and optimise reaction conditions, alongside rigorous setups such as Seebeck calorimetry and nanosecond pulse stimulation.Section 5, Conclusion
The way in
https://doi.org/10.3389/fmats.2024.1500487How to cite it
Nurlan Bakranov, Zhanserik Kuli, David Nagel, Dina Bakranova (2024) Nanomaterials engineering for enhanced low energy nuclear reactions: a comprehensive review and future prospects doi:10.3389/fmats.2024.1500487