Sodium-Poor, Hydroxyl-Rich, Defective NaTiO Prepared by γ-Irradiation and Its Enhanced Proton Conductivity.

The use of γ-irradiation to tailor the physicochemical properties of materials is not widely applied to layered alkali metal oxides. Herein, we show that γ-irradiation (up to 400 kGy) of NaTiO leads to a sodium-poor, hydroxyl-rich analogue where the layered structure, plate-like morphology, and textural properties are preserved. The deintercalation of sodium ions modifies the Ti-O bond lengths and expands the unit cell; the latter is supported by density functional theory (DFT) calculations.

Alternating current properties of bulk- and nanosheet-graphitic carbon nitride compacts at elevated temperatures.

The investigations of temperature-dependent electrical properties in graphitic carbon nitride (g-CN) have been largely performed at/below room temperature on devices commonly fabricated by vacuum techniques, leaving the gap to further explore its behaviors at high-temperature. We reported herein the temperature dependence (400 → 35 °C) of alternating current (AC) electrical properties in bulk- and nanosheet-g-CN compacts simply prepared by pelletizing the powder. The bulk sample was synthesized the direct heating of urea, and the subsequent HNO-assisted thermal exfoliation yielded the nanosheet counterpart.

Electrochemical and electrical characteristics of ball milled CsTiO modified by the surface-to-bulk migration of hydroxyl groups.

Ball milling of solids under benign conditions leads to surface functionalization without altering the crystal structure and morphology. However, these additional surface functional groups are rarely fixed but instead mobilized across such ball milled solids. This phenomenon, including its effects on electrochemical and electrical properties, has received limited attention.

TiO/graphitic carbon nitride nanosheet composite with enhanced sensitivity to atmospheric water.

Understanding the fundamentals of transport properties in two-dimensional (2D) materials is essential for their applications in devices, sensors, and so on. Herein, we report the impedance spectroscopic study of carbon nitride nanosheets (CNNS) and the composite with anatase (TiO/CNNS, 20 atom% Ti), including their interaction with atmospheric water. The samples were characterized by X-ray diffraction, N adsorption/desorption, solid state H nuclear magnetic resonance spectroscopy, thermogravimetric analysis, and transmission electron microscopy.

Theoretically proposed stable polymorph of two-dimensional pentagonal β-PdPSe.

The theoretical discovery of new and stable 2D penta materials based on first-principles calculations has stimulated technological advances due to the anticipated exotic properties of such structures, which include the α and β phases of penta-NiPS. Inspired by the similarity between the theoretically proposed penta-NiPS and the experimentally synthesized (α phase) of penta-PdPSe, we propose herein the β phase of penta-PdPSe as a new penta-2D material. Comprehensive analyses indicated that β phase penta-PdPSe is thermodynamically, dynamically, mechanically, and thermally stable, similar to its NiPS analogue.

Catalytic deoxygenation of fatty acids ketonization and α-carbon scissions over layered alkali titanate catalysts under N.

The ketonization of fatty acid with subsequent McLafferty rearrangement of the fatty ketone allows the deoxygenation to hydrocarbons. Here, we report the cascade reaction of palmitic acid (C) to hydrocarbons (≤C) over lepidocrocite-type alkali titanate KZnTiO, KMgTiO, and KLiTiO and the reassembled TiO catalysts at ≤400 °C under atmospheric N in a continuous fixed-bed flow reactor. The C acid is coupled to C ketone prior to the scissions mostly to a C methyl ketone and C hydrocarbons (, the McLafferty rearrangement).

Towards a new packing pattern of Li adsorption in two-dimensional pentagonal BCN.

Two-dimensional (2D) materials with a penta-atomic-configuration, such as penta-graphene and penta-BC, have received great attention as anodes in Li-ion batteries (LIBs). Recently, penta-BCN has been demonstrated to exhibit the highest theoretical capacity to date of 2183 mA h g, corresponding to the composition LiBCN. Herein, we study the layer-by-layer Li adsorption on penta-BCN by explicitly and comprehensively considering its structure.

Structural and Compositional Characteristics of Ball-Milled Lepidocrocite Alkali Titanate and the Correlation to Its Surface Acidic-Basic Properties.

The studies on mechanical treatments of layered alkali metal oxides are limited despite their diverse compositions/structures and potential for property tuning. In this work, we vibratory mill CsZnTiO, KZnTiO, and CsTiO for up to 4 h, during which the lepidocrocite-type structure and the plate-like morphology are well preserved. X-ray diffraction (XRD) indicates a tiny (≤0.

Titania Nanosheet Generates Peroxynitrite-Dependent Nitrosylation and Enhances p53 Function in Lung Cancer Cells.

Metal nanomaterials can enhance the efficacy of current cancer therapies. Here, we show that TiO nanosheets cause cytotoxicity in several lung cancer cells but not in normal cells. The nanosheet-treated cells showed certain apoptosis characteristics.

Flexible capacitive sensor based on 2D-titanium dioxide nanosheets/bacterial cellulose composite film.

In this paper, titanium dioxide nanosheets (TiO NSs) were incorporated into bacterial cellulose (BC) film for dielectric property tuning while maintaining the flexibility of the resulting composite paper. By taking advantage of the improved dielectric constant, the nanosheets/BC composites were employed as capacitive sensors. The fabricated devices showed the highest sensing performance of ∼2.

AC Conductivity and Dielectric Properties of Lepidocrocite-type Alkali Titanate Tunable by Interlayer Cation and Intralayer Metal.

The lepidocrocite-type layered alkali titanate TiO has diverse chemical compositions with variation in charge per formula unit , the interlayer cation , and the intralayer metal . Despite this multivariable nature, the composition dependence of physical properties is not well explored. We report herein the AC conductivity and the complementary dielectric properties of CsTiO, KTiO ( = Zn, Ni), and the mixed-interlayer ion CsKZnTiO.

An Unusually Acidic and Thermally Stable Cesium Titanate Cs TiM O ( x = 0.67 or 0.70; M = vacancy or Zn).

Proton-free, alkali-containing layered metal oxides are thermally stable compared to their protonic counterparts, potentially allowing catalysis by Lewis acid sites at elevated temperatures. However, the Lewis acidic nature of these materials has not been well explored, as alkali ions are generally considered to promote basic but to suppress acidic character. Here, we report a rare example of an unusually acidic cesium-containing oxide Cs TiM O ( x = 0.

TiO Nanosheets Inhibit Lung Cancer Stem Cells by Inducing Production of Superoxide Anion.

Recent research into the cancer stem cell (CSC) concept has driven progress in the understanding of cancer biology and has revealed promising CSC-specific targets for drug discovery efforts. As malignancies of lung cancer have been shown to be strongly associated with activities of CSCs, we examined the effects of TiO nanosheets on these cells. Here we show that the nanosheets target lung CSCs but not normal primary dermal papilla (DP) stem cells.

Beyond soft chemistry - bulk and surface modifications of polycrystalline lepidocrocite titanate induced by post-synthesis thermal treatment.

While the soft chemistry of layered alkali metal oxides is adequately understood, the effect of the post-synthesis thermal treatment on their structure, composition, and properties has been underexplored. In this article, we thoroughly investigated the bulk and surface modifications of KMTiO (M = Ni, Cu, Zn) lepidocrocite titanate thermally treated within 200 °C above its synthetic temperature under air. This practice was typically employed in e.

The aqueous colloidal suspension of ultrathin 2D MCM-22P crystallites.

The action of a tetrapropylammonium hydroxide solution on lamellar zeolite precursor MCM-22P produced a stable aqueous colloidal suspension which was shown by X-ray diffraction, small angle X-ray scattering and atomic force microscopy to contain ultrathin two-dimensional (2D) crystallites, including one-unit cell thick (i.e., 2.

Synthesis of ternary and quaternary graphite intercalation compounds containing alkali metal cations and diamines.

A series of ternary graphite intercalation compounds (GICs) of alkali metal cations (M = Li, Na, K) and diamines [EN (ethylenediamine), 12DAP (1,2-diaminopropane), and DMEDA (N,N-dimethylethylenediamine)] are reported. These include stage 1 and 2 M-EN-GIC (M = Li, d(i) = 0.68-0.