Relationship between hydrogen bond network dynamics of water and its terahertz spectrum

Duan, Tong-Chuan; Yan, Sen; Zhao, Yan; Sun, Tingyu; Li, Yang-Mei; Zhu, Zhi

doi:10.7498/aps.70.20211731

Cited by 11 publications

(5 citation statements)

References 49 publications

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“…In other words, the system exhibits a high-order ice phase at this point, suggesting that the diffusion coefficient is small, as shown in figure 1. When f = 24 THz, the first and second peaks of g oo (r) decrease with the increasing r and the third and fourth peaks disappear, showing the microstructural characteristics of short-range order and long-range structural disorder, in accordance with the arrangement of the liquid molecules [60].…”

Section: Resultsmentioning

confidence: 89%

Electricity resonance-induced phase transition of water confined in nanochannels

Ma,

Zhao,

Hao

et al. 2024

Commun. Theor. Phys.

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The phase transition of water molecules in nanochannels under varying external electrical field is studied by molecular dynamics simulations. It is found that the phase transition of water molecules in nanochannels occurs by changing the frequency of the varying electrical field. Water molecules maintain ice phase when the frequency of the varying electrical field is less than 16 THz or greater than 30 THz, and they completely melt at the frequency of varying electrical field of 24 THz. The phenomenon is attributed to the break of the hydrogen bonds when the frequency of the varying electrical field is close to their inherent resonant frequency. Moreover, the study demonstrates that the critical frequency varies with the confined situation. The new mechanism of regulating the phase transition of water molecules in nanochannels revealed in this study provides a perspective for further understanding of the phase transition of water molecules in nanochannels, and has great application potential in anti-icing.

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Section: Resultsmentioning

confidence: 89%

Electricity resonance-induced phase transition of water confined in nanochannels

Ma,

Zhao,

Hao

et al. 2024

Commun. Theor. Phys.

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“…The spectral intensity of different concentrations of sodium hexametaphosphate solution demonstrates that the THz absorption intensity of the sodium salt solution decreased with the increase in concentration, whereas the THz transmission increased. The THz spectra show that the dissolution of sodium hexametaphosphate in water promotes the breaking of the hydrogen bond between water molecules to some extent because the absorption of THz waves by water is mainly due to the hydrogen bond, thus improving the transmission intensity of the THz wave 14 .…”

Section: Resultsmentioning

confidence: 99%

THz properties of two food additives sodium solution based on microfluidic chips

Peng,

Qian,

Zhang

et al. 2023

Journal of Modern Optics

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The vibration and rotation energy levels of many molecules are in the terahertz (THz) band, so THz spectroscopy can be used to qualitatively identify substances. However, the terahertz spectrum of most molecules in aqueous solution is completely different from that of solid molecules, and they have strong absorption characteristics for terahertz waves. Therefore, how to reduce the absorption of water for THz wave has become an urgent problem to be solved. Food additives are our daily necessities. They can extend the shelf life of food. In this study, a micro uidic chip with very low THz wave absorption was designed, and the THz transmission spectra of food-additive sodium hexametaphosphate solution and sodium pyrophosphate solution were measured using THz time domain spectroscopy (THz-TDS) system.The experimental results show that the THz spectral intensity of the two sodium salt solutions increases with the increase of solution concentration, which is completely contrary to the phenomenon of common sodium salts, such as sodium chloride. It shows that the process of ion hydration affects the hydrogen bond between water molecules and changes the absorption of THz waves by water. This method lays a foundation for further study of the THz characteristics of electrolyte solutions.

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“…The intermolecular stretching and bending of vibrational modes of this network are in the terahertz band (strong resonance frequency of 1.5 THz). When a neuron is exposed to terahertz wave radiation, the vibrational modes of the hydrogen bonds in it are excited, thus triggering resonance ( Duan et al, 2021 ). The dynamic equilibrium of the water molecular network structure is broken, resulting in strong absorption of terahertz waves by the water ( Kristensen et al, 2016 ).…”

Section: Discussionmentioning

confidence: 99%

The laws and effects of terahertz wave interactions with neurons

Gong

et al. 2023

Front. Bioeng. Biotechnol.

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Introduction: Terahertz waves lie within the energy range of hydrogen bonding and van der Waals forces. They can couple directly with proteins to excite non-linear resonance effects in proteins, and thus affect the structure of neurons. However, it remains unclear which terahertz radiation protocols modulate the structure of neurons. Furthermore, guidelines and methods for selecting terahertz radiation parameters are lacking.Methods: In this study, the propagation and thermal effects of 0.3–3 THz wave interactions with neurons were modelled, and the field strength and temperature variations were used as evaluation criteria. On this basis, we experimentally investigated the effects of cumulative radiation from terahertz waves on neuron structure. Results: The results show that the frequency and power of terahertz waves are the main factors influencing field strength and temperature in neurons, and that there is a positive correlation between them. Appropriate reductions in radiation power can mitigate the rise in temperature in the neurons, and can also be used in the form of pulsed waves, limiting the duration of a single radiation to the millisecond level. Short bursts of cumulative radiation can also be used. Broadband trace terahertz (0.1–2 THz, maximum radiated power 100 μW) with short duration cumulative radiation (3 min/day, 3 days) does not cause neuronal death. This radiation protocol can also promote the growth of neuronal cytosomes and protrusions.Discussion: This paper provides guidelines and methods for terahertz radiation parameter selection in the study of terahertz neurobiological effects. Additionally, it verifies that the short-duration cumulative radiation can modulate the structure of neurons.

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Relationship between hydrogen bond network dynamics of water and its terahertz spectrum

Cited by 11 publications

References 49 publications

Electricity resonance-induced phase transition of water confined in nanochannels

Electricity resonance-induced phase transition of water confined in nanochannels

THz properties of two food additives sodium solution based on microfluidic chips

The laws and effects of terahertz wave interactions with neurons

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