Anuraag Gaddam

Anuraag Gaddam
University of Aveiro | UA · Department of Materials and Ceramics Engineering

Doctor of Philosophy

About

36
Publications
6,293
Reads
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490
Citations
Citations since 2016
29 Research Items
478 Citations
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140
Additional affiliations
January 2013 - December 2016
University of Aveiro
Position
  • PhD Student
June 2011 - September 2012
Indian Institute of Technology Bombay
Position
  • Master's Thesis
April 2008 - June 2008

Publications

Publications (36)
Article
Structural rearrangements taking place during relaxation and crystal nucleation in lithium-disilicate (LS2) glass have been investigated by a comprehensive set of solid-state nuclear magnetic resonance (NMR) experiments, supported by molecular dynamics (MD) simulations. Samples were subjected to heat treatments at 435°C, i.e., 20 K below the labora...
Article
Utilization of optical limiting materials to suppress the input intense laser energy is obligatory in a wide variety of applications that deploy the high‒power laser sources. In this letter, we demonstrate that the optimization of borate structural units in lanthanum borate (LB) glasses through the addition of various concentrations of heavy metal...
Article
Glasses are emerging as promising and efficient solid electrolytes for all-solid-state sodium-ion batteries. However, they still suffer from poor ionic conductivity and crack- resistance, which need to be improved for better battery performance, reliability, and service life. The current study shows a significant enhancement in crack resistance (fr...
Article
Full-text available
3D printing emerged as a potential game-changer in the field of biomedical engineering. Robocasting in particular has shown excellent capability to produce custom-sized porous scaffolds from pastes with suitable viscoelastic properties. The materials and respective processing methods developed so far still need further improvements in order to obta...
Article
Full-text available
In view of recent energy crisis and environmental considerations, reductions of melting temperature and CO2 emissions during the production of commercial soda lime silicate (SLS) glass at industrial scale are major intentions. Here we show that this goal can be achieved by using carbonate-free borate minerals such as colemanite (Ca2B6O11·5H2O) and...
Article
Full-text available
Sol–gel synthesis using inorganic and/or organic precursors that undergo hydrolysis and condensation at room temperature is a very attractive and less energetic method for preparing bioactive glass (BG) compositions, as an alternative to the melt-quenching process. When properly conducted, sol–gel synthesis might result in amorphous structures, wit...
Article
In this paper we present a new series of alkali‐free bioactive glasses (BG) based on FastOs® composition (38.49 SiO2 – 36.07 CaO – 19.24 MgO – 5.61 P2O5 – 0.59 CaF2, expressed in mol %), which was modified by partially replacing silicon dioxide network‐former with boron trioxide network‐former, utilizing calcium oxide as a charge compensator. The m...
Article
Full-text available
Yttria‐stabilized zirconia (YSZ) scaffolds with a planned macro porosity fraction of about 70% were fabricated by Robocasting from inks with high solid loadings. The effects of solids loading and the concentrations of processing additives on the flow behavior of the starting suspensions and the viscoelastic properties of the resulting inks were inv...
Article
This work is a proof of concept for making load bearing implants with osseointegration and bone bonding ability. Yttria‐Stabilized Zirconia (YSZ) scaffolds with a percentage of macro porosity of about 70% were fabricated by robocasting. Although a maximum solids volume fraction of 50 vol.% could be achieved, the 3D‐printing process revealed to be m...
Article
The structural role of V in 28Li2O–72SiO2 (in mol %) lithium silicate glass doped with 0.5 mol % V2O5 was assessed using 29Si and 51V Nuclear Magnetic Resonance (NMR), Fourier‐Transform InfraRed (FTIR) and X‐ray Photoelectron (XPS) spectroscopy techniques. Despite the low amount of V2O5 used, the structural information obtained or deduced from the...
Article
Exploring the reasons for the initiation of Al-O-Al bond formation in alkali-earth aluminosilicate glasses is a key topic in the glass-science community. Evidence for the formation of Al-O-Al and Al-NBO bonds in the glass composition 38.7 CaO - 9.7 MgO - 12.9 Al2O3 - 38.7 SiO2 (CMAS, mol%) has been provided based on Molecular Dynamics (MD) simulati...
Article
Recycling has emerged as an environmental key point due to the diminishing of natural resources and the generation of ever‐increasing amounts of industrial solid wastes. Glass wastes are among the materials that attract great interest in the recycling concept. This work presents the results of foams production from four series of compositions. The...
Article
The present work elucidates about the structure of bioactive glasses having chemical compositions expressed as (mol %) (50.0-x) SiO2 - x B2O3 - 9.3 Na2O - 37 CaO - 3.7 P2O5, where x = 0.0, 12.5, 25 and 37.5, and establishes a correlation between the structure and thermal stability. The structural modifications in the parent boron free glass (B0) wi...
Article
Full-text available
Structural and optical properties of antimony containing sodium borate glasses were studied and their ultrafast third-order nonlinear optical (NLO) properties have been evaluated using Z-scan measurements with femtosecond (fs) pulses (~150 fs, 80 MHz) at 750 nm, 800 nm and 880 nm wavelengths. Glasses in the (mol %) 20Na 2 O-(80-x)B 2 O 3-xSb 2 O 3...
Article
The alleged formation of La-clusters in silicate glasses has received an overall consensus. However, recent and the current experimental results do not support this hypothesis for the structural role of La2O3 in glasses. Therefore, here we propose a new model for the assignment of the peaks in NMR spectra. All the experimental results here reported...
Article
Full-text available
The discovery of bioactive glasses (BGs) in the late 1960s by Larry Hench et al. was driven by the need for implant materials with an ability to bond to living tissues, which were intended to replace inert metal and plastic implants that were not well tolerated by the body. Among a number of tested compositions, the one that later became designated...
Article
Aluminosilicate glasses are considered to follow the Al-Avoidance principle, which states that Al-O-Al linkages are energetically less favourable, such that, if there is a possibility for Si-O-Al linkages to occur in a glass composition, Al-O-Al linkages are not formed. The current paper shows that breaching of the Al-Avoidance principle is essenti...
Article
During the last decades, the nucleation and crystallization of the Li2O-SiO2 system has been widely investigated and its particular theoretical features disclosed. However, multicomponent lithium disilicate systems, being of higher technological interest, still require further studies aiming at better tailoring their relevant mechanical and chemica...
Article
The current study reports on the relaxation behaviour of lithium silicate based glasses as probed by NMR spectroscopy. A total of four glass compositions were studied with the parent composition being 28Li2O‒72SiO2, and added dopants of Al and B. All the compositions showed significant differences in the NMR spectra of both annealed and non-anneale...
Article
In this paper, we derive a new model to determine the distribution of silicate units in binary glasses (or liquids). The model is based on statistical mechanics and assumes grand canonical ensemble of silicate units which exchange energy and network modifiers from the reservoir. This model complements experimental techniques, which measure short ra...
Article
This article reports on the effect of Al2O3 and B2O3 added as dopants on the preparation of glass-ceramics (GCs) belonging to the lithium silicate glass system. The GCs are prepared by sintering route using glass powders. The reasons for the crystallization of the metastable crystalline phase lithium metasilicate (LS) are discussed and the impact o...
Article
The aim of the present work is to investigate the effect of substituting B2O3 for Al2O3 in a non-stoichiometric lithium disilicate (Li2Si2O5, LS2) glass composition belonging to the system Li2O–K2O–Al2O3–SiO2. Addition of equimolar amounts of K2O and Al2O3 to binary lithium silicate glass compositions improves chemical resistance, sintering behavio...
Article
The aim of the present work is to investigate the effect of substituting B2O3 for Al2O3 in a non-stoichiometric lithium disilicate (Li2Si2O5, LS2) glass composition belonging to the system Li2O–K2O–Al2O3–SiO2. Addition of equimolar amounts of K2O and Al2O3 to binary lithium silicate glass compositions improves chemical resistance, sintering behavio...
Article
The aim of the present work is to investigate the effect of substituting B 2 O 3 for Al 2 O 3 in a non-stoichiometric lithium disilicate (Li 2 Si 2 O 5 , LS 2) glass composition belonging to the system Li 2 O–K 2 O– Al 2 O 3 –SiO 2. Addition of equimolar amounts of K 2 O and Al 2 O 3 to binary lithium silicate glass compositions improves chemical r...
Article
Full-text available
The structural role of Mn was investigated in a relatively simple non-stoichiometric lithium disilicate (Li2Si2O5) based glass composition. Glasses were prepared by partially replacing SiO2 by MnO2 from the base glass belonging to the system Li2O–K2O–Al2O3–SiO2. An overall depolymerization of the glass network was observed according to magic angle...
Article
Glass-ceramics are used in dentistry for various applications such as dental inlays, onlays, crowns, veneers, bridges, etc. Especially lithium disilicate glass-ceramics, because of their excellent aesthetics, supreme mechanical properties and ease of shaping into final restoration, are becoming a compelling material in dental prosthetics. The prese...

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Projects (3)
Project
To understand the structural modifications by characterizing the prepared glasses using FTIR, Raman, and NMR techniques. Also, the structural correlations are provided for observed properties.