scholarly journals Low Frequency Electrical Resonance in Water

2020 ◽  
Author(s):  
Xindong Wang ◽  
Qiang Fu
Keyword(s):  
Excited State ◽  
Dielectric Properties ◽  
Boundary Conditions ◽  
Resonance Frequency ◽  
Room Temperature ◽  
Low Frequency ◽  
Controlling Factors ◽  
Quantum Mechanical ◽  
Electrical Resonance ◽  
Ph Level

We report the observation of sharp electrical resonance of water with width ~2 neV in the low radiofrequency range at room temperature. Various controlling factors, including temperature, pH level, biasvoltage, and boundary conditions are found to impact on the resonance frequency and intensity. The neVlevel of the resonant width is not expected under room temperature (~25 meV), within any existingmolecular theory of the dielectric properties of water, strongly suggesting that a macroscopic long-rangecoherent quantum mechanical excited state is responsible for the resonance.

Impact of anisotropic strains on low-frequency dielectric properties and room-temperature polar phases of SrTiO3 epitaxial thin films

2011 ◽  
Vol 375 (22) ◽  
pp. 2189-2192
Author(s):  
W.S. Yan ◽  
R. Zhang ◽  
Z.L. Xie ◽  
X.Q. Xiu ◽  
C.Z. Zhao ◽  
...  
Keyword(s):  
Thin Films ◽  
Dielectric Properties ◽  
Room Temperature ◽  
Low Frequency ◽  
Epitaxial Thin Films

Fabrication and Study of BiNbO4 Ceramics

2012 ◽  
Vol 512-515 ◽  
pp. 1212-1217 ◽  
Author(s):  
Agata Lisińska-Czekaj ◽  
Dionizy Czekaj
Keyword(s):  
Dielectric Properties ◽  
Crystalline Structure ◽  
Room Temperature ◽  
Sintering Temperature ◽  
Ceramic Powder ◽  
Low Frequency ◽  
Diffraction Method ◽  
Orthorhombic Symmetry ◽  
X Ray Diffraction ◽  
Bismuth Niobate

Aim of the present research was to fabricate and study crystalline structure as well as dielectric properties of BiNbO4 ceramics. In the present study BiNbO4 ceramics was fabricated by solid state reaction from the mixture of simple oxides viz. Bi2O3, and Nb2O5. Stoichiometric mixture of the powders was thermally analyzed so parameters of the thermal treatment were determined. The EDS measurements proved conservation of the chemical composition of the ceramic powder after calcination (T=800°C). Free sintering at T=870 – 1080 °C was used for fabrication of the ceramic samples. Morphological analysis using scanning electron microscopy was performed. The crystalline structure of the sintered samples were examined by X-ray diffraction method at room temperature. It was found that for low temperature of sintering (T0C) bismuth niobate crystallized in orthorhombic symmetry Pnna (52) whereas for high sintering temperature (T>1000 °C) BiNbO4 exhibited anorthic symmetry P-1 (2). Low frequency (ν=100Hz – 1MHz) impedance spectroscopy was applied to study influence of the sintering temperature on dielectric properties of bismuth niobate at room temperature. The equivalent circuit method was used for analysis of the impedance data.

Quantum Mechanical Interpretation of the Ultra-Low Energy Methyl-Rotation Dynamics in Porous Metal-Organic Frameworks Probed by Low-Frequency Vibrational Spectroscopy and ab initio Simulations

2018 ◽  
Author(s):  
Qi Li ◽  
Adam J. Zaczek ◽  
Timothy M. Korter ◽  
J. Axel Zeitler ◽  
Michael T. Ruggiero
Keyword(s):  
Ab Initio ◽  
Metal Organic Frameworks ◽  
Low Frequency ◽  
Rotor Dynamics ◽  
Quantum Mechanical ◽  
Valuable Insight ◽  
Void Space ◽  
Ab Initio Simulations ◽  
Metal Organic ◽  
Insight Into

<div>Understanding the nature of the interatomic interactions present within the pores of metal-organic frameworks</div><div>is critical in order to design and utilize advanced materials</div><div>with desirable applications. In ZIF-8 and its cobalt analogue</div><div>ZIF-67, the imidazolate methyl-groups, which point directly</div><div>into the void space, have been shown to freely rotate - even</div><div>down to cryogenic temperatures. Using a combination of ex-</div><div>perimental terahertz time-domain spectroscopy, low-frequency</div><div>Raman spectroscopy, and state-of-the-art ab initio simulations,</div><div>the methyl-rotor dynamics in ZIF-8 and ZIF-67 are fully charac-</div><div>terized within the context of a quantum-mechanical hindered-</div><div>rotor model. The results lend insight into the fundamental</div><div>origins of the experimentally observed methyl-rotor dynamics,</div><div>and provide valuable insight into the nature of the weak inter-</div><div>actions present within this important class of materials.</div>

scholarly journals Thermochromic aggregation-induced dual phosphorescence via temperature-dependent sp3-linked donor-acceptor electronic coupling

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Tao Wang ◽  
Zhubin Hu ◽  
Xiancheng Nie ◽  
Linkun Huang ◽  
Miao Hui ◽  
...  
Keyword(s):  
Excited State ◽  
Room Temperature ◽  
Electronic Coupling ◽  
Temperature Dependent ◽  
Molecular Systems ◽  
Donor And Acceptor ◽  
Theoretical Investigations ◽  
Donor Acceptor ◽  
And Control ◽  
Two Temperature

AbstractAggregation-induced emission (AIE) has proven to be a viable strategy to achieve highly efficient room temperature phosphorescence (RTP) in bulk by restricting molecular motions. Here, we show that by utilizing triphenylamine (TPA) as an electronic donor that connects to an acceptor via an sp3 linker, six TPA-based AIE-active RTP luminophores were obtained. Distinct dual phosphorescence bands emitting from largely localized donor and acceptor triplet emitting states could be recorded at lowered temperatures; at room temperature, only a merged RTP band is present. Theoretical investigations reveal that the two temperature-dependent phosphorescence bands both originate from local/global minima from the lowest triplet excited state (T1). The reported molecular construct serves as an intermediary case between a fully conjugated donor-acceptor system and a donor/acceptor binary mix, which may provide important clues on the design and control of high-freedom molecular systems with complex excited-state dynamics.

scholarly journals Ultra long‐lived triplet excited state in water at room temperature: Insights on the molecular design of tridecafullerenes

2021 ◽  
Author(s):  
Javier Ramos-Soriano ◽  
Alfonso Pérez-Sánchez ◽  
Sergio Ramírez-Barroso ◽  
Beatriz M. Illescas ◽  
Khalid Azmani ◽  
...  
Keyword(s):  
Excited State ◽  
Room Temperature ◽  
Molecular Design ◽  
Triplet Excited State

Chapter Open for the Excited-State Intramolecular Thiol Proton Transfer in the Room-Temperature Solution

2021 ◽  
Author(s):  
Chun-Hsiang Wang ◽  
Zong-Ying Liu ◽  
Chun-Hao Huang ◽  
Chao-Tsen Chen ◽  
Fan-Yi Meng ◽  
...  
Keyword(s):  
Excited State ◽  
Proton Transfer ◽  
Room Temperature ◽  
Temperature Solution
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