Coordinates: 22°50′24″N 88°36′39″E / 22.84000°N 88.61083°E / 22.84000; 88.61083Central Glass and Ceramic Research Institute (CGCRI) is a Kolkata based National research institute under Council of Scientific and Industrial Research, India. Established in 1950 it focuses on the area of glass, ceramics, mica, refractories etc..
The present work is mainly focussed on the optical studies of Tm3+ ions doped Alkaline-Earth Alumino-Borate(AEAlB) glasses that are giving the luminescence in short-wavelength region especially in blue region (458 nm). All the AEAlBTm glasses were synthesized with various dopant concentrations to explore the absorption and short-wavelength photoluminescence (PL) properties. The Judd-Ofelt (J-O) parameters were evaluated from the absorption spectra profiles. The concentration-dependant spectra of blue luminescence from 1D2 energy transition were thoroughly studied and radiative-properties like stimulated emission cross-section-(16.80 x 10-18 cm2) and quantum efficiency-(88 %) found to be high for AEAlBTm0.5 glass, hence AEAlBTm0.5 can be suggested for optical pumping applications.
Sodium alumino-borosilicate glasses of two series: 25Na2O-10Al2O3-xMO-5B2O3-(60-x) SiO2 (M = Ca and Mg, x = 10 and 15 mol
ABSTRACT The development of effective self‐powered energy harvesters is essential for wearable technology. In this work, a high‐performance PVDF (polyvinylidene fluoride‐TrFE (trifluoroethylene), abbreviated as PVDF‐TrFE) and MXene‐based flexible composite film was fabricated with improved electroactive behavior and self‐polarization effect. MXene was synthesized by chemical etching from the Ti 3 AlC 2 MAX phase, further added to the PVDF‐TrFE matrix at 1, 3, 5, and 10 wt.%. According to structural investigations, the surface functional groups of MXene enhanced β/γ crystalline phases and interfacial polarization, reaching a maximum crystallinity of 77% at 3 wt.% MXene. At this loading, FTIR confirmed a greater electroactive phase content that increases surface polarity and decreases the contact angle value of the composite. Superior dielectric, ferroelectric, and piezoelectric capabilities are demonstrated by the optimized 3 wt.% composite, which has a d 33 value of 30.3 pm/V measured from PFM. The device, which was integrated as a hybrid piezoelectric‐triboelectric nanogenerator (TENG), generated a maximum output voltage of ∼135 V and instantaneous power density of ∼125 µW cm − 2 , rectifying ∼70 V to power up capacitors, LEDs, and calculators. In addition, the device can monitor daily human motion such as walking, jumping, running, etc., when the device is embedded below the shoe sole. The device has a force sensitivity of ∼26 V/N in the range of applied force varying from 1.5 to 4.2 N. This study demonstrated a viable approach for creating polymer‐based nanocomposites for wearable and sustainable energy‐harvesting applications.
ABSTRACT Bone regeneration is regulated by mechanical forces, biochemical gradients, and endogenous electrical cues, which collectively guide cellular behavior during repair and remodeling. The bone's electrophysiological environment arises from overlapping effects, including piezoelectricity, pyroelectricity, ferroelectricity, dielectric properties, and streaming potentials, all generated by routine mechanical activity. This environment plays a central role in bone metabolism and regeneration. Understanding bone as a natural electroactive composite informs the design of advanced biomaterials. Replicating these electrical cues is a promising approach for developing biomaterials that actively promote bone regeneration. This review examines the biological origins of electrical phenomena in bone, including streaming potentials, piezoelectricity, and ion‐mediated signaling, and their roles in osteogenesis, angiogenesis, and immune modulation. We evaluate how electroactive ceramics and glasses generate electrical stimulation through piezoelectric, ferroelectric, and magnetoelectric mechanisms, influencing cellular activity and tissue repair. Recent developments in composite systems, multifunctional scaffolds, and smart platforms are highlighted. Key challenges discussed include long‐term electrical stability, scalable manufacturing, sterilization, safety, and regulatory compliance. By integrating knowledge from bone electrophysiology, materials science, and biomedical translation, this review outlines a pathway for engineering smart ceramic‐ and glass‐based biomaterials that replicate endogenous electrophysiology to support bone regeneration.
ABSTRACT Rapid quantification of urinary catecholamine metabolites is important for neurochemical profiling and screening of neuroendocrine disorders. Here, a Cu‐MOF‐74 modification is made on a screen‐printed planar electrode to enable selective detection of homovanillic acid (HVA) through an electrochemical route in buffer and artificial urine. Structural characterization confirms a crystalline porous framework in Cu‐MOF‐74 with accessible Cu(II) sites. The Cu‐MOF‐74–modified electrode shows an amplified anodic response and improved interfacial charge transfer relative to the bare electrode, giving a linear calibration from 0.1–100 µM and a limit of detection (LoD) of 47.9 nM. The response is stable in the presence of potential interferents (uric acid, dopamine, and ascorbic acid), with a strip‐to‐strip relative standard deviation of ∼3.2%. Density functional theory calculations for HVA at representative open Cu(II) nodes indicate adsorption‐driven preconcentration with interfacial charge redistribution, consistent with the observed signal enhancement. These results highlight Cu‐MOF‐74 as a ceramic–organic electrocatalytic interface for urine‐matrix electroanalysis and motivate validation using real clinical specimens.
