Volume 12, Issue 11, December 2021

Research Article

Electrocaloric Effect in Sodium Bismuth Titanate Based Ferroelectric Composites

Rajani Malathi Alupatla; G. S. Kumar; G. Prasad

Advanced Materials Letters, 2021, Volume 12, Issue 11, Pages 1-5
DOI: 10.5185/amlett.2021.111676

Mixed system of (1-x)Na0.5Bi0.5TiO3+(x)SrTiO3 (NBT-ST) where x=0.075, 0.125, 0.150, 0.200 ferroelectric ceramic materials are synthesized using modified pechini method. These optimized compositions are used for study of polarization versus electric field (P-E) loops. The ferroelectric response of the samples is investigated as a function of temperature. Remnant polarization of exhibited loops observed to decrease with increasing temperature. PE data is used to estimate the electrocaloric properties. Maximum entropy change, full width at half maximum, relative cooling power is obtained from theoretical calculations.

Structural, Optical and Photo Catalytic Properties of CdS Thin Films Synthesized by Green-CBD Method

Vikas Sawant; D.A. Lavate; A.S. Khomane

Advanced Materials Letters, 2021, Volume 12, Issue 11, Pages 1-5
DOI: 10.5185/amlett.2021.111677

Aim of this work is to study the synthesis of CdS thin films by eco-friendly rout and analyze the change in structural and optical properties of material due to use of biomolecules as a stabilizing agent. The CdS thin films were deposited in lemon extract and ammonia solution separately by maintaining the same physical parameters and analyzed for tailoring of structural and optical properties. Green-CBD method minimizes the use of toxic precursors and volatilization of ammonia solution. X-Ray Diffraction study indicates formation of face centered cubic crystalline phase predominantly for CdS thin films materials with change in grain size. SEM analysis revealed the formation of CdS nanospheres in ammonia while CdS nanocubes in lemon extract. The direct allowed band gap energy was observed in the order of 2.45 eV and 2.25 eV which were interesting for optical studies. UV-Vis Absorption spectra and PL spectra of thin films indicates the CdS thin film material has absorption maxima in visible (400-800 nm) region. As synthesized CdS thin films were applied for photodegradation of Rhodamine-B dye solution under sunlight. The CdS thin film material deposited by Green-CBD rout shows high efficiency for degradation of Rhodamine-B solution as compared to films deposited by CBD method.

A Simple and Convenient Synthesis of 2, 3-dihydroquinazolin-4(1H)-one Derivatives using MgFe2O4@SiO2-SO3H Catalyst

Anand Aswar; Nilesh Govindrao Salunkhe; Chandrashekhar Arun Ladole; Nikita Vinod Thakare; Jagruti Manish Barabde

Advanced Materials Letters, 2021, Volume 12, Issue 11, Pages 1-5
DOI: 10.5185/amlett.2021.111678

In the present study, use of MgFe2O4@SiO2-SO3H as an efficient, green, magnetically recoverable & recyclable catalyst for micro-wave assisted solvent free synthesis of 2,3-dihydroquinazolin-4(1H)-ones reaction pathway is presented. The superiorities of this method are higher conversion rate, shorter reaction time, easy isolation of product and reusability of catalyst without remarkable loss of activity. The synthesized 2,3-dihydroquinazolin-4(1H)-ones derivatives were assessed for their antimicrobial and antifungal activity; where, the most of these compounds exhibit potent antibacterial and antifungal activities against various bacteria and fungi.

Review Article

A Review on Green Polymer Binder-based Electrodes and Electrolytes for All Solid-State Li-ion batteries

Adhigan Murali; Saravanan Ashok Vallal; Mohan Sakar; R. Ramesh; M. Devendiran; N. Suthanthira Vanitha

Advanced Materials Letters, 2021, Volume 12, Issue 11, Pages 1-9
DOI: 10.5185/aml.2022.4140.1002

It is not an exaggerated fact that the whole world relies on the energy storage systems such as Li-ion batteries (LIBs). Li-ion batteries have been widely used in electric vehicles and electronic devices such as laptops, mobile phones, etc. However, the commercial Li-ion batteries have many issues associated with safety and durability including the thermal runaway and the use of toxic solvents during the construction of batteries. In order to highlight the recent developments towards addressing these issues, we have summarized the major impact in replacing the toxic solvents, which are conventionally used to dissolve the binder in the commercial Li-ion batteries, with the aqueous-based binder called green binders. Further, an emphasis has been given on the importance of shifting from flammable liquid electrolytes to non-flammable solid-electrolytes, which essentially suppress the issues such as leakage problems, mechanical failure and fire explosives in LIBs. Even though considerable works have been performed on the development of green-based solid polymer electrolytes, it still needs more effort to overcome the obstacles towards improving the properties of the solid-polymer matrix, which is their low ionic conductivity at low temperatures. Further research in this direction has been highlighted in this review, which involves improving the interfacial contacts in the solid-polymer electrolytes, where the interfacial interaction and conductive mechanisms are yet to be clearly investigated to have the solid-electrolytes with improved electrochemical property.

Research Article

Spectrophotometric Determination of Curcumin after Preconcentration by Ultrasonic Assisted Supramolecular Dispersive Liquid-liquid Microextraction based on Solidification of Floating Organic Drops using Taguchi Design Method

Ardeshir Shokrollahi; Samira Hessampour

Advanced Materials Letters, 2021, Volume 12, Issue 11, Pages 1-8
DOI: 10.5185/aml.2022.4167.1008

In this paper, the Taguchi orthogonal design was applied to optimize the extraction efficiencies for the determination of curcumin, after the separation and preconcenteration by supramolecular based-ultrasonic assisted-dispersion solidification liquid-liquid microextraction (SM-UA-DSLLME) procedure coupled with spectrophotometric UV-Vis. The experimental design consisted of six parameters (pH, amount of the extraction and disperser solvents, salt effect, sonication time and centrifuge time), each at five levels. The preconcentration method is based on the dispersion-solidification liquid-liquid microextraction of curcumin with decanoic acid/THF as the supramolecular solvent (a nano-structured liquid occurring on two scales, molecular and nano). The purpose method had two linear ranges of 0.01–0.40 and 0.40-3.50 mg L−1 of curcumin with R2= 0.9922 and 0.9799, respectively. The enrichment factors of 478.48 and 118.80 were obtained for down and up linear ranges, respectively. The preconcentration factor under consideration recovery was obtained 46. Detection limit was 5.2 µg L−1 and the relative standard deviation (RSD%), for eight replicate measurements of 0.2 mg L−1 curcumin was 2.47%. The results obtained from the analysis of variance (ANOVA), revealed that the most important effectible parameters onextraction curcumin are volume of disperser solvent and pH. The applicability of method was successfully applied to determine of trace curcumin in tablet, sewage and water samples.

Mechanical and Thermal Properties of Gd-Doped ZnO Nanorods

Pramod Kumar Yadawa; Navin Chaurasiya; Sachin Rai

Advanced Materials Letters, 2021, Volume 12, Issue 11, Pages 1-6
DOI: 10.5185/amlett.2021.111681

All the elastic, mechanical and thermal properties of Gd-doped ZnO nanorods (NRs) have studied using interaction potential model. Gd-doped ZnO nanorods are hexagonal wurtzite structure. The characteristic features of elastic characteristics of Gd-doped ZnO NRs imply that this is mechanically stable. For mechanical characterization, bulk modulus (B), shear modulus (G), Young's modulus (Y), Pugh's ratio (B / G), Poisson’s ratio and anisotropic index are evaluated using second order elastic constants. For the investigation of anisotropic behaviour and thermophysical properties, ultrasonic velocities and thermal relaxation time have been also calculated along with different orientations from the unique axis of the crystal. The mechanical properties of the Gd-doped ZnO nanorods are better than at 6% Gd amount due to minimum attenuation. The obtained results are analyzed to explore the characteristic of ZnO nanorods. Computed elastic, ultrasonic and thermal properties are correlated to evaluate the microstructural behaviour of the materials useful for industrial applications

Synthesis Tuning for Manufacturing Carbon Hybrid Materials

Sung Yong Kim; Megha Chitranshi; Anuptha Pujari; Vianessa Ng; Ashley Kubley; Ronald Hudepohl; Vesselin Shanov; Devanathan Anantharaman; Daniel Chen; Devika Chauhan; Mark Schulz

Advanced Materials Letters, 2021, Volume 12, Issue 11, Pages 1-8
DOI: 10.5185/amlett.2021.111682

The overall hypothesis for this paper is that accurately tuning the gas phase pyrolysis synthesis process and using appropriate raw materials will enable manufacturing different types of carbon hybrid materials (CHM). Optimizing multiple variables including particle melting and vaporization temperatures, fuel flow rate, gas flow rates, gas velocity, and sock wind-up speed is needed to achieve reliability of the synthesis process. Results from our specific reactor are presented to show how the process variables interact and how they affect CNT sock yield and stability. Metal nanoparticle (NP) injection enables the formation of hybrid materials. Several types of CHM materials created by incorporating different types of NPs into the carbon nanotube (CNT) synthesis process and CNT sock are discussed. Many possible combinations of metal NPs can be used in the process to customize the properties of CHM. However, it is a complex problem to determine what metal compounds can chemically join with CNT. Some of the first results testing the new CHM process are presented in this paper.