| 1. |
- Awe, Samuel A., et al.
(författare)
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Development of new Al-Cu-Si alloys for high temperature performance
- 2017
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Ingår i: Advanced Materials Letters. - : VBRI Press. - 0976-3961 .- 0976-397X. ; 8:6, s. 695-701
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Tidskriftsartikel (refereegranskat)abstract
- In a quest to develop new light metal alloys that can perform excellently at elevated-temperatures (from 300°C to 400°C), a ternary eutectic Al-Cu-Si alloy was exploited to gain a deeper understanding of the alloy system and its suitability for high temperature applications. The alloys studied, with chemical composition of Al-27%Cu-5%Si (by weight percent) with Ni addition in the range of 0 to 1.5%wt, were cast in a rapid solidification casting technique. The solidification characteristics of the alloy was studied using the Thermo-Calc software. Microstructures were characterized in a scanning electron microscope coupled with energy dispersive spectrometry (SEM-EDS). Finally, the elevated-temperatures tensile properties of the alloys were investigated. Comparing the microstructures and mechanical properties of these Al-Cu-Si(-Ni) alloys with conventional Al-Si alloy A319, the refined microstructure with dispersed Ni intermetallic particles formed in the as-cast Al-Cu-Si(-Ni) alloys deliver improved elevated temperature properties. In particular, the yield strength and ultimate tensile strength of the new alloy with 1.5% Ni at 400?C were observed to be 220% and 309% higher, respectively, than for conventional A319 alloy.
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| 2. |
- Chey, Chan Oeurn, et al.
(författare)
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Impact of nanotoxicology towards technologists to end users
- 2013
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Ingår i: Advanced Materials Letters. - Allahabad, Uttar Pradesh , India : Vinova Bhave Research Institute. - 0976-3961 .- 0976-397X. ; 4:8, s. 591-597
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Tidskriftsartikel (refereegranskat)abstract
- The length scale for nanomaterial is small enough to be invisible and presume innocence for the initial avoidance of the toxicity issues. Again it was beyond the understanding of the time frame when nanotechnology just blooms that a length scale itself might be an important toxic parameter apart from its materialistic properties. We present this report to address the fundamental issues and questions related to the nanotoxicity issues from laboratory to the land of applications. We emphasize about the basic nanoscale materials that are regularly being used by the scientific community and the nanotechnology based materials that has already in the market or will come soon.
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| 3. |
- Dobryden, Illia, et al.
(författare)
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Morphological and electrical characterization of Cu-doped PbS thin films with AFM
- 2017
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Ingår i: Advanced Materials Letters. - : VBRI Press. - 0976-3961 .- 0976-397X. ; 8:11, s. 1029-1037
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Tidskriftsartikel (refereegranskat)abstract
- Lead sulphide (PbS) is a direct band gap IV–VI intrinsic p-type semiconductor with good potential for application in solar cells, sensors, etc. Doping the films with Cu2+ ions may improve the electrical properties. Here, Cu-doped PbS films were deposited on conducting glass substrates. The morphology, topography and thickness of the doped PbS films were examined using atomic force microscopy (AFM) and high-resolution SEM. AFM analysis showed decreasing surface roughness and grain size with the increase of Cu2+ concentration from 0.5 to 2.0 at%. Local surface electrical measurements using conducting AFM and Kelvin probe force microscopy showed the possibility to probe semi-quantitatively the changes in surface potential, work function, and Fermi level upon doping of the films. The estimated apparent work function for the un-doped PbS grains in the film was slightly above 4.5 eV, while it decreased to a minimum value of 4.43-4.45 eV at 1–1.5 at% Cu-doping. Conducting AFM measurements showed that local resistance of the doped samples is lower than on pure PbS films. These results indicate Cu doping as an effective strategy to tune the electrical properties of PbS thin films toward the development of suitable optically active materials for application in photovoltaics.
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| 4. |
- Elbadawi, Mohammed, 1987-, et al.
(författare)
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Porous hydroxyapatite scaffolds fabricated from nano-sized powder via honeycomb extrusion
- 2017
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Ingår i: Advanced Materials Letters. - : International Association of Advanced Materials. - 0976-3961 .- 0976-397X. ; 8:4, s. 377-385
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Tidskriftsartikel (refereegranskat)abstract
- In this study, we have developed hydroxyapatite (HA) scaffolds for synthetic bone graft from nano-sized HA particles using ceramic extrusion. We also demonstrate that these HA scaffolds show enhanced compressive strength (29.4 MPa), whilst possessing large pore sizes (> 600 µm) that are suitable for bone grafting. The extrusion process involved forming a ceramic paste by mixing the HA powder with a binder and distilled water. The ceramic paste was then fabricated using a ram extruder that was fitted with a honeycomb die to impart large, structured pores. Several green bodies were extruded and then subjected to the same drying and thermal debinding treatment. The samples underwent three different sintering temperatures and two varied dwell times, in order to determine the optimum sintering parameters. The scaffolds were then analysed for their chemical, physical, mechanical and biological properties to elucidate the effects of the sintering parameters on extruded HA scaffolds. The results revealed that the nano-sized particles exhibited a high sinterability, and XRD analysis showed phase purity until 1300 oC. At 1300 oC, trace amounts of phase impurities were detected, however, scaffolds sintered at this temperature exhibited the highest mean compressive strength. The findings demonstrated that traces of phase impurities were not detrimental to the scaffold’s compressive strength. In addition, scanning electron microscopy and density measurements revealed a highly densified solid phase was attained.
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| 5. |
- Kumari, Poonam, et al.
(författare)
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Study of Ca doping on A- site on the structural and physical properties of BLTMNZ ceramics
- 2014
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Ingår i: Advanced Materials Letters. - : Vinova Bhave Research Institute. - 0976-3961 .- 0976-397X. ; 5:5, s. 255-259
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Tidskriftsartikel (refereegranskat)abstract
- The ferroelectric Ca doped (Ba0.9575La0.04X0.0025) (Ti0.815Mn0.0025Nb0.0025Zr0.18)0.99O3 was prepared by a high-temperature solid state reaction technique. For the understanding of the electrical and dielectric property, the relation between the crystal structures, electrical transition and ferroelectric transitions with increasing temperature (–160 to 35°C) have been analyzed. X-ray diffraction analysis of the powders suggests the formation of a single-phase material with monoclinic structure. Capacitance and tanδ of the specimens were measured in the temperature range from -160 to 35°Cat frequencies 1 kHz – 1 MHz. Detailed studies of dielectric and electrical properties indicate that the Curie temperature shifted to higher temperature with the increase in frequency. Moreover, the dielectric maxima dropped down rapidly initially and the dielectric peaks became extremely broad. The AC conductivity increases with increase in frequency. The low value of activation energy obtained for the ceramic samples could be attributed to the influence of electronic contribution to the conductivity.
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| 6. |
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| 7. |
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| 8. |
- Rafat, Mehrdad
(författare)
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Book Review On Integrated Biomaterials For biomedical Technology
- 2013
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Ingår i: Advanced Materials Letters. - : International Association of Advanced Materials. - 0976-3961 .- 0976-397X. ; 4:3, s. 250-250
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Recension (övrigt vetenskapligt/konstnärligt)abstract
- This book covers a wide range of biomaterials from polymers and ceramics to metals, composites, nanomaterials, and biosensor materials for various biomedical applications. I strongly recommend this book for those who have a basic knowledge in biomaterials who want to expand their knowledge and to know more about biomaterials’ applications. Having said that, the book is so well-designed that is understandable by those with no prior knowledge in biomaterials such as students and young researchers or experienced researchers in other fields. For instance, at the beginning of each chapter, there is an introduction section with enough background information, which prepares the readers for the next sections. More specifically, I’m quite impressed with the application sections providing the readers with real-world health problems and how a specific biomaterial or a medical device, which is comprised of several biomaterials, can address those problems. This book can definitely help bridging the gap between science and technology in the biomedical field. I would like to congratulate the editors and the authors of this book for the excellent work and look forward to their next contribution to the field.
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| 9. |
- Shukla, S. K., et al.
(författare)
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Fabrication of electro-chemical humidity sensor based on zinc oxide/polyaniline nanocomposite
- 2012
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Ingår i: Advanced Materials Letters. - : Vinova Bhave Research Institute. - 0976-3961 .- 0976-397X. ; 3:5, s. 421-425
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Tidskriftsartikel (refereegranskat)abstract
- The present work reports the synthesis of nano size zinc oxide encapsulated polyanaline by wet-chemical method at ambient condition. The prepared composite was characterized by XRD, SEM, TGA and UV-Vis spectroscopy. The results revealed the formation of the crystalline homogenous ZnO centered composite with electrical conductance in the range of 10-2scm-1 andthermal stability up to 280 0C. Further, electrical resistance of a ZnO/PANi film of ~200 nm thickness was monitored against humidity to use as humidity sensitive element. The observed sensing parameters were response time, 32 sec; and recovery time,45 sec; sensor has exhibited better sensing characteristics than pure PANi and other reported humidity sensors.
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| 10. |
- Shukla, S. K., et al.
(författare)
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Fabrication of ultra-sensitive optical fiber based humidity sensor using TiO2 thin film
- 2012
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Ingår i: Advanced Materials Letters. - : VBRI Press. - 0976-3961 .- 0976-397X. ; 3:5, s. 365-370
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Tidskriftsartikel (refereegranskat)abstract
- Thin films of titanium dioxide in anatase form have been prepared using isobutyl titanate as precursor. The resulting TiO2 was coated on an U-shaped pyrex glass rod to sense the humidity of a controlled humid environment using optical fiber approach. The humidity sensing characteristics and the sensing mechanism have been investigated by measuring the output power of the sensor at different humidity. The developed humidity sensor was responded in the humidity ranging from 10 to 95% of relative humidity and exhibited the sensitivity of 0.78, response time 36s and recovery time 73s.
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| 11. |
- Shukla, S. K., et al.
(författare)
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Preparation and characterization of cellulose derived from rice husk for drug delivery
- 2013
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Ingår i: Advanced Materials Letters. - Allahabad, Uttar Pradesh, India : Vinova Bhave Research Institute. - 0976-3961 .- 0976-397X. ; 4:9, s. 714-719
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Tidskriftsartikel (refereegranskat)abstract
- Cellulose has been the extracted from rice husk by chemical treatment with aqueous solution of sodium hydroxide. The physical properties of derived cellulose (water uptake and swelling behavior) has been investigated with view of different applications. The morphology and chemical structure were investigated by Infrared spectroscopy (FT-IR), Scanning electron microscopy (SEM) and Thermogravimetry (TG) techniques. The results revealed the formation of homogeneous porous (micro size) membrane. Further, the UV-vis spectra of cellulose in different pH shows its responsiveness towards hydronium ion, which is suitable for drug delivery. Further, obtained cellulose was used for drug delivery under optimized pH.
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| 12. |
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| 13. |
- Tiwari, Ashutosh
(författare)
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Frontiers in bio-nanocomposites
- 2011
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Ingår i: Advanced Materials Letters. - : VBRI Press. - 0976-3961 .- 0976-397X. ; 2:6
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 14. |
- Tiwari, Ashutosh, 1978-
(författare)
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Intelligent nanomaterials for prospective nanotechnology
- 2012
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Ingår i: Advanced Materials Letters. - : VBRI Press. - 0976-3961 .- 0976-397X. ; 3:1, s. 1-1
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Nanomaterials play very prominent role in physical, chemical and biomedical engineering applications due their high surface energies. Also the electronic configuration of atoms within the materials is very important since this principally detrmines the type of bonding and thus electrical, optical, luminescent, mechanical and magnetic properties. At nanoscale dimensions, materials exhibit entirely different properties as compared to thieir bulk counterpart. Noble metallic nanoparticles/nanostructures exhibit interesting feature of localised surface plasmon resonant; absorption can be tuned from ultraviolet region to infrared region of electromagnetic spectrum and this field has been developed to deliver potential applications in photonics, optoelectronics, optical-data storage, solar cells, filters, sensors not to mention the considerable scope in medical engineering,
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| 15. |
- Tiwari, Ashutosh
(författare)
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State-of-the-art of stimuli-responsive materials
- 2013
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Ingår i: Advanced Materials Letters. - India : Vinova Bhave Research Institute. - 0976-3961 .- 0976-397X. ; 4:7, s. 507-507
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 16. |
- Tiwari, Ashutosh
(författare)
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Supervision of doctoral student by public-private sectors patnership: A special focus on healthcare nanotechnology
- 2013
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Ingår i: Advanced Materials Letters. - : International Association of Advanced Materials. - 0976-3961 .- 0976-397X. ; 4:2, s. 106-107
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The supervision of conducting a doctorate degree in interdisciplinary science and technology such as healthcare nanotechnology, a strategic supervisory role is essential. Supervision of such doctor of philosophy (PhD)students immerses in an internationally leading education, research environment and provide a wide range of scientific and complementary training, executed both inter and intra university-private sectors joint supervisions. The focus of this editorial is to bring the criteria to produce trained, highly competent, enthusiastic and creative PhDs by the public and private sectors partnership. The interdisciplinary PhD supervision approach would make significant contributions to designed, constructed and commercialized new technology including personalized healthcare and medical nanodevices.
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| 17. |
- Turner, Anthony, 1950-
(författare)
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Biosensors and bioelectronics
- 2011
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Ingår i: Advanced Materials Letters. - : International Association of Advanced Materials. - 0976-3961 .- 0976-397X. ; 2, s. 82-83
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Tidskriftsartikel (refereegranskat)abstract
- Bioelectronics embodies the exploitation of biological or biologically-inspired molecules as an integral part of an electronic devices and biosensors are the analytical embodiment of this art. The world market for biosensors, in 2009, was just under US$13 billion, with nearly nine tenths of that still accounted for by glucose measurement. This extraordinary dominance by a single biosensor type is driven by the exceptional needs of people with diabetes combined with the success of biosensors in meeting their demands for an appropriate product. The overall in vitro diagnostics market is currently considered to be worth around $40 billion, while recent estimates suggest that the theranostics (companion diagnostics) market is potentially worth a staggering $72 billion. Diabetes is the fastest growing chronic disease in the World, with Asia now home to four of the five largest diabetic populations and 2% of the World‘s population afflicted. Heart disease and stroke kill around 17 million people each year, accounting for one-third of all deaths globally.
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| 18. |
- Chaudhary, Shilpi, et al.
(författare)
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X-ray photoelectron spectroscopy study of adsorption of (3-mercaptopropyl)trimethoxysilane and n-propyltriethoxysilane on a rutile TiO2(110) surface
- 2015
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Ingår i: Advanced Materials Letters. - 0976-3961. ; 6:4, s. 279-283
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Tidskriftsartikel (refereegranskat)abstract
- We have studied the adsorption of two silane compounds, (3-mercaptopropyl) trimethoxysilane (MPTMS) and n-propyltriethoxysilane (PTES), on a rutile TiO2(110) surface using angle dependent X-ray photoelectron spectroscopy. The observation of the S 2p line, in the case of MPTMS, and the C 1s line for both MPTMS and PTES confirms the adsorption of the molecules. For a dose of 122 Langmuirs of MPTMS we find room temperature coverage of 0.55 monolayers, while for a 60 Langmuir dose of PTES the coverage is found to be 0.89 monolayers. Thus, MPTMS has a considerably lower sticking coefficient on the rutile TiO2(110) surface than PTES. Both PTES and MPTES are found to bind dissociatively to the surface. An analysis of angle dependent data further suggests that for MPTMS the thiol group and thus alkyl chain points away from the surface, while for a 0.5 monolayer coverage of PTES the alkyl chain is oriented towards the surface. A higher coverage, ~1 monolayer, the behavior seems to be reversed for at least a fraction of all molecules. Temperature programed XPS measurements suggest that the oxy groups of both molecules desorb from the surface at 550 K, which is in accordance with literature. The present study thus provides information on how these silane coupling agents bind to titanium oxide and what their molecular orientation is on the surface.
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