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Laser-induced self-organization in Se–Te–Sn–Cd glassy semiconductor for developing novel light-sensing dielectrics
Publication date: Available online 10 December 2019Source: Progress in Natural Science: Materials InternationalAuthor(s): Amit Kumar, Arvind Sharma, Neeraj MehtaAbstractThe laser-induced effects on dielectric properties of chalcogenide glass (ChGs) have been present in a glassy system of Se–Te–Sn–Cd for possible applications in optics and optoelectronics such as light-controlled capacitance-based touch displays. The temperature/frequency dependence of dielectric relaxation before and after laser exposure was investigated by using laser sources of different wavelengths (405 nm, 532 nm, 690 nm, and 785 nm). The...
Source: Progress in Natural Science: Materials International - December 12, 2019 Category: Materials Science Source Type: research

Structural, mechanical and corrosion properties of CNT-304 stainless steel nanocomposites
Publication date: Available online 10 December 2019Source: Progress in Natural Science: Materials InternationalAuthor(s): A.V. Radhamani, Hon Chung Lau, S. RamakrishnaAbstractIn this work, a systematic investigation was performed on the structural, mechanical and corrosion properties of CNT incorporated 304 stainless steel. Various concentrations of CNT from 0.5 to 4 wt% were incorporated into the 304 stainless steel matrix to investigate the feasibility of fabrication and enhancement of strength and other material properties. The fabrication of CNT-steel composite was achieved through a spark plasma sintering process at...
Source: Progress in Natural Science: Materials International - December 12, 2019 Category: Materials Science Source Type: research

Recent advances in graphene based photoresponsive materials
Publication date: Available online 10 December 2019Source: Progress in Natural Science: Materials InternationalAuthor(s): Hong Chi, Karthika Murali, Tianduo Li, Sabu ThomasAbstractRecent scientific interests reveal that graphene, with its flexibility, chemical stability, thermal conductivity, unique electronic band structure and optical transmittance, has emerged as the novel supporting material for nanocomposites for various applications. Research interests have flourished regarding decoration of conventional materials with modified graphene for achieving better optical properties. More concern is given for achieving impr...
Source: Progress in Natural Science: Materials International - December 12, 2019 Category: Materials Science Source Type: research

Surface PEGylation of hollow mesoporous silica nanoparticles via aminated intermediate
Publication date: Available online 10 December 2019Source: Progress in Natural Science: Materials InternationalAuthor(s): Thi Ngoc Tram Nguyen, Diem-Huong Nguyen-Tran, Long Giang Bach, Tran Hoang Du Truong, Ngoc Thuy Trang Le, Dai Hai NguyenAbstractA hybrid of organic/inorganic system, hollow mesoporous silica nanoparticles functionalized with poly(ethylene glycol), was synthesized in the presence of coupling agent and aminated ends. Doxorubicin (DOX) was used as a model drug to evaluate the effect of PEGylation on the loading capacity and release pattern of the system. Characterization with transmission electron microscop...
Source: Progress in Natural Science: Materials International - December 12, 2019 Category: Materials Science Source Type: research

Highly active brookite TiO2-assisted photocatalytic degradation of dyes under the simulated solar−UVA radiation
Publication date: Available online 10 December 2019Source: Progress in Natural Science: Materials InternationalAuthor(s): Huyen Tran Thi Thuong, Chi Tran Thi Kim, Liem Nguyen Quang, Hendrik KosslickAbstractBrookite TiO2 nanoparticles were synthesized by hydrothermal method and characterized by X-ray powder diffraction (XRD), diffuse reflectance UV–Visible spectroscopy (DRUV), and scanning electron microscopy (SEM). The obtained particles were spherical in shape with the diameter of about ~10 nm under the hydrothermal temperature of 175 °C. The photocatalytic performance of brookite was investigated in the photodegra...
Source: Progress in Natural Science: Materials International - December 12, 2019 Category: Materials Science Source Type: research

PVP-assisted laser ablation growth of Ag nanocubes anchored on reduced graphene oxide (rGO) for efficient photocatalytic CO2 reduction
In this study, a facile method was reported to realize a straightforward growth of shape and size-controllable of metallic nanoparticles, and the subsequent hybridization with graphene in solution by strategically coupling wet-chemical route and laser ablation. By mixing graphene oxide (GO) with a tunable concentration level of polyvinylpyrrolidone (PVP) in aqueous solution, Ag nanocubes with a face-centered cubic crystal structure were generated by pulsed laser ablation and then mounted on GO nanosheets with the assistance of PVP. The preferential adsorption of PVP to Ag (100) crystal face led to the production of Ag nano...
Source: Progress in Natural Science: Materials International - December 12, 2019 Category: Materials Science Source Type: research

3D TEM study on hollow α-Fe2O3 nanostructures and nanorings
Publication date: Available online 10 December 2019Source: Progress in Natural Science: Materials InternationalAuthor(s): Ming Lin, Enyi Ye, Jia ZhangAbstractControlled synthesis of hollow structures with non-spherical holes is significant in fabricating nanomaterials with well-defined geometries and specific catalytic and electrochemical properties. Here we report the synthesis of uniform hexagonal bipyramid hematite (α-Fe2O3) nanoparticles with hollow and faceted interior via directional etching process in solution. The delicate hollow structures were investigated by electron tomography and growth mechanism was revealed...
Source: Progress in Natural Science: Materials International - December 12, 2019 Category: Materials Science Source Type: research

Building well-defined hierarchical nanostructures for sulfur and silicon electrodes
Publication date: Available online 10 December 2019Source: Progress in Natural Science: Materials InternationalAuthor(s): Ning Ding, Dong-Sheng Geng, Lan Zhou, Zhao-Lin Liu, Ai-Shui Yu, Yun ZongAbstractHuge volume expansion of electrode materials (e.g. 80% for sulfur and 310% for silicon) in the electrochemical lithiation reaction is seen as a root-cause of fast capacity fading of rechargeable lithium batteries. In this work, an effective solution is demonstrated by fabricating thin film sulfur and silicon electrodes with hierarchical structure of sulfur (or silicon) particles sandwiched between adjacent reduced graphene o...
Source: Progress in Natural Science: Materials International - December 10, 2019 Category: Materials Science Source Type: research

Cationic polymeric nanoformulation: Recent advances in material design for CRISPR/Cas9 gene therapy
Publication date: Available online 10 December 2019Source: Progress in Natural Science: Materials InternationalAuthor(s): Kaifeng Chen, Shan Jiang, Yun Hong, Zibiao Li, Yun-Long Wu, Caisheng WuAbstractCRISPR/Cas9 (clustered regularly interspaced short palindromic repeat/clustered regularly interspaced short palindromic repeat associated proteins 9) gene editing platform is a promising therapeutic tool for genetic disorders, due to its ability to manipulate the pathogenic gene in genomic level and to easily target specific gene by manipulating single-guide RNA. However, its successful delivery remains a challenge. Up to now...
Source: Progress in Natural Science: Materials International - December 10, 2019 Category: Materials Science Source Type: research

Glass-forming ability, phase formation and mechanical properties of glass-forming Cu-Hf-Zr alloys
We report on a distinct correlation between phase formation and GFA of Cu50Zr50-based alloys. Increasing additions of Hf reduce the thermal stability of the high-temperature B2 Cu(Hf,Zr) phase, while the thermal stability of the corresponding undercooled melt is enhanced. The GFA of these alloy series gradually raises up to 10 at.% Hf, whereas at 20 at.%Hf, the GFA is drastically lowered, since the B2 Cu(Hf,Zr) phase becomes unstable and the precipitation of the low-temperature equilibrium phases is favoured. This interrelation determines the microstructure and results in the formation of Cu-Hf-Zr-based bulk metallic g...
Source: Progress in Natural Science: Materials International - November 20, 2019 Category: Materials Science Source Type: research

Bandgap energy determination of InAsSb epilayers grown by molecular beam epitaxy on GaAs substrates
Publication date: Available online 12 October 2019Source: Progress in Natural Science: Materials InternationalAuthor(s): K. Murawski, E. Gomółka, M. Kopytko, K. Grodecki, K. Michalczewski, Ł. Kubiszyn, W. Gawron, P. Martyniuk, A. Rogalski, J. PiotrowskiAbstractInAsSb ternary alloys can be considered as an alternative to HgCdTe for mid-wavelength, as well as long-wavelength infrared applications. Its energy bandgap exhibits nonlinearity versus Sb composition, and hence the correct determination of its value is necessary for the effective design and simulation of optoelectronic devices. The commonly used expression on the...
Source: Progress in Natural Science: Materials International - October 12, 2019 Category: Materials Science Source Type: research

The improvement of surface quality and thickness stability of Fe78Si9B13 melt-spun ribbons by melt overheating
Publication date: Available online 4 October 2019Source: Progress in Natural Science: Materials InternationalAuthor(s): Hui Gao, Zongzhen Li, Shaoxiong Zhou, Guangqiang Zhang, Nairi CuiAbstractThe influence of melt overheating on the viscosity of the melt and surface quality of the Fe78Si9B13 melt-spun ribbons have been studied by using oscillating vessel viscometry, X-ray diffraction, transmission electron microscopy, and field emission scanning electron microscopy. A critical temperature Tc (about 1350 °C) of the melt transformation was determined via viscosity measurements during overheating and subsequent cooling pr...
Source: Progress in Natural Science: Materials International - October 6, 2019 Category: Materials Science Source Type: research

Dynamic recrystallization behavior of the Ti–48Al–2Cr–2Nb alloy during isothermal hot deformation
Publication date: Available online 3 October 2019Source: Progress in Natural Science: Materials InternationalAuthor(s): Xiaofei Chen, Bin Tang, Yan Liu, Xiangyi Xue, Lei Li, Hongchao Kou, Jinshan LiAbstractThe hot deformation behavior of the as-cast Ti–48Al–2Cr–2Nb alloy was investigated by isothermal compression tests at deformation temperatures ranging from 1000 °C to 1200 °C, and strain rates from 0.001 s−1 to 0.1 s−1. The single peak stress features common to all flow curves indicate that DRX is the dominating softening mechanism. The calculated values of the hot deformation activation energy Q and stre...
Source: Progress in Natural Science: Materials International - October 4, 2019 Category: Materials Science Source Type: research

Synthetic CaSiO3 sol-gel powder and SPS ceramic derivatives: “In vivo” toxicity assessment
Publication date: Available online 3 October 2019Source: Progress in Natural Science: Materials InternationalAuthor(s): Evgeniy Konstantinovich Papynov, Oleg Olegovich Shichalin, Vladimir Iosifovich Apanasevich, Igor Sergeevich Afonin, Ivan Olegovich Evdokimov, Vitaliy Yurievich Mayorov, Arseniy Sergeevich Portnyagin, Irina Grigorievna Agafonova, Yulia Evgenievna Skurikhina, Mikhael Azarievich MedkovAbstractThe paper presents template strategy using siloxane-acrylate latex and its modified form to prepare nanostructured calcium silicate (wollastonite) containing nanosized gold and regular porosity. Optimal conditions for t...
Source: Progress in Natural Science: Materials International - October 4, 2019 Category: Materials Science Source Type: research

Inhibition of stray grains at melt-back region for re-using seed to prepare Ni-based single crystal superalloys
Publication date: Available online 3 October 2019Source: Progress in Natural Science: Materials InternationalAuthor(s): Songsong Hu, Lin Liu, Wenchao Yang, Dejian Sun, Miao Huo, Yafeng Li, Taiwen Huang, Jun Zhang, Haijun Su, Hengzhi FuAbstractAssisted by the mold preinstalled an alumina tube into seed segment, the influence of the original primary dendrite spacing of seed on the formation of stray grains at melt-back region was investigated during Ni-based single crystal casting using seeding method. The results showed that the interface reaction between the seed and mold as well as the formation of stray grains at the sur...
Source: Progress in Natural Science: Materials International - October 4, 2019 Category: Materials Science Source Type: research