Extensive research is being carried out on Ni-rich Li(NixCoyMn1-x-y)O2 (NCM) due to the growing demand for electric vehicles and reduced cost. In particular, Ni-rich Li(NixCoyMn1-x-y-zAlz)O2 (NCMA) is attracting great attention as a promising candidate for the rapid development of Co-free but electrochemically more stable cathodes. Al, an inactive element in the structure, helps to improve structural stability and is also used as a doping element to improve cycle capability in Ni-rich NCM. In this study, NCMA was successfully synthesized with the desired composition by direct coprecipitation. Boron and tin were also used as dopants to improve the battery performance. Macro- and microstructures in the cathodes were examined by microscopy and X-ray diffraction. While Sn was not successfully doped into NCMA, boron could be doped into NCMA, leading to changes in its physicochemical properties. NCMA doped with boron revealed substantially improved electrochemical properties in terms of capacity retention and rate capability compared to the undoped NCMA.

Silver/graphene core/shell nanocomposites were synthesized through a one-step electric explosion of wire method using only silver wires and ethanol. The morphology of the graphene shell structures can be easily formed by alternating the solvent from deionized water to ethanol. Transmission electron microscopy revealed that the size of the prepared silver/graphene core/ shell nanocomposites was in the 10–110 nm range. The Raman spectra showed the formation of graphene shells on silver. A possible formation mechanism of the silver/graphene core/shell nanocomposites is proposed in this study. The crystallinity of the nanoparticles was investigated via X-ray diffraction. The graphene on the surfaces of the nanocomposites containing functional groups was analyzed through Fourier-transform infrared spectroscopy and X-ray photoelectron spectroscopy analyses. Zeta potential and dynamic light scattering analyses were performed to determine the dispersion characteristics of the nanocomposites when redispersed in other solvents.

Nanomaterials (NMs) are gradually becoming pervasive in the modern world, entering every application for improving the quality of life. Multifaceted uses of NMs in curing diseases, biomedical instrumentation, bioimaging, drugs, and gene delivery, display devices, nanosensors, and biomarkers in several fields ranging from agriculture to industries, healthcare, and environment, have been well recognized. Carbon-based nanomaterials (CNMs) constitute a major type of NMs with broad-spectrum applications including their uses in agriculture. These are synthesized in large quantities via synthetic and biological approaches. Biological approaches are gaining appreciation and momentum, owing to the advantages associated with them, major being their environment friendly or ‘Green’ nature. This topical review focuses on the preparation of CNMs using natural resources, i.e., using the Green Nanotechnology. The up-to-date compilation presented here includes most of the popular green technological methods of producing the CNMs and their immediate uses as anticancer agents, in bio-labelling, as biosensors, in bio-remediation, in cell imaging, in fluorescent inks, and fluorescent dyes, as plant growth inducing agents, in nano-probes, in light-emitting devices and other applications. It is intended to update the reader with the state-of-the-art knowledge about the green technological methods for synthesizing CNMs, their uses, current trends, challenges, and future outlook on the topic.

ZnO nanosheets have been used for many devices and antibacterial materials with wide bandgap and high crystallinity. Among the many methods for synthesizing ZnO nanostructures, we report the synthesis of ZnO/Zn(OH)2 nanosheets using the ionic layer epitaxy method, which is a newly-developed bottom-up technique that allows the shape and thickness of ZnO/Zn(OH)2 nanosheets to be controlled by temperature and time of synthesis. Results were analyzed by scanning electron microscopy and atomic force microscopy. The physical and chemical information and structural characteristics of ZnO/ Zn(OH)2 nanosheets were compared by X-ray photoelectron spectroscopy and X-ray diffraction patterns after various posttreatment processes. The crystallinity of the ZnO/Zn(OH)2 nanosheets was confirmed using scanning transmission electron microscopy. This study presents details of the control of the size and thickness of synthesized ZnO/Zn(OH)2 nanosheets with atomic layers.

Fluorescent nanostructures based on carbon, or carbon dots, are attracting much attention and interest because of their diverse properties which can be applied in several fields of knowledge, such as optics, biomedicine, environmental research, among others. Such properties are in part, derived from its intrinsic luminescence from tunable functional groups. In this work, we produced carbon nanodots (CND) using agro-industrial residues, such as Lolium perenne and malt bagasse. The methods used were conventional hydrothermal syntheses and microwave-assisted hydrothermal synthesis. To the best of our knowledge, this is the first time that carbon dots synthesized from this ryegrass type are reported. The synthesis methods were one step (no catalyst, base, or acid were added for passivation), and the functional groups responsible for the luminescence and high solubility in water were identified by infrared spectroscopy, being mainly C=O, C–OH, C–N, and N–H. According to our theoretical studies, the C=O group introduced a new energy level for electronic transitions that can affect the emission properties. Fluorescence images of osteoblasts using CNDs were acquired and their chelating property towards Pb2+ and Cr6+ detection was tested.

In this article, Pb2Ba1.7Sr0.3Ca2Cu3O10+δ superconductor material was synthesized using conventional solid-state reaction method. X-ray diffraction (XRD) analysis demonstrated one dominant phase 2223 and some impurities in the product powder. The strongest peaks in the XRD pattern were successfully indexed assuming a pseudo-tetragonal cell with lattice constants of a = 3.732, b = 3.733 and c = 14.75 Å for a Pb-Based compound. The crystallite size and lattice strain between the layers of the studied compound were estimated using several methods, namely the Scherrer, Williamson-Hall (W.H), sizestrain plot (SSP) and Halder Wagner (H.W) approach. The values of crystallite size, calculated by Scherrer, W.H, SSP and H.W methods, were 89.4540774, 86.658638, 87.7555823 and 85.470086 Å, respectively. Moreover, the lattice strain values obtained by W.H, SSP and H.W methods were 0.0063240, 0.006325 and 0.006, respectively. It was noted that all crystallite size results are consistent; however, the best method is the size-strain plot because it gave a value of R2 approaching one. Furthermore, degree of crystallites was calculated and found to be 59.003321%. Resistivity analysis suggests zero-resistance, which is typical of superconducting materials at critical temperature. Four-probe technique was utilized to measure the critical temperature at onset Tc(onset), zero resistivity Tc(off set), and transition (width ΔT), corresponding to temperatures of 128 K, 116 K, and 12 K, respectively.

The remarkable electrical, thermal, mechanical, and optical properties of graphene and its derivative grapheme oxide have recently gained great importance, along with the large surface area and single-atoms thickness. In this respect, several techniques of synthesis such as chemical exfoliation, mechanical exfoliation, or chemical synthesis have been discovered. However, the development of graphene with fewer defects and on a large scale poses major challenges; therefore, it is increasingly necessary to produce it in large proportions with high quality. This paper reviews the top-down synthesis approach of graphene and its well-known derivative graphene oxide. Furthermore, characterization of graphene oxide nanomaterial is a critical component of the analysis. The characterization techniques employed to determine the quality, defects intensity, number of layers, and structures for graphene oxide nanomaterial at the atomic scale. This article focuses on the different involved characterization methodology for graphene oxide with their percentage utilization for the past 11 years. Additionally, reviewing all of the characterization literature for the last 11 years would be a difficult task. Therefore, the aim is to outline the existing state of graphene oxide by different characterization techniques and provide a comparative analysis based on their percentage utilization.

Tungsten carbide is widely used in carbide tools. However, its production process generates a significant number of end-of-life products and by-products. Therefore, it is necessary to develop efficient recycling methods and investigate the remanufacturing of tungsten carbide using recycled materials. Herein, we have recovered 99.9% of the tungsten in cemented carbide hard scrap as tungsten oxide via an alkali leaching process. Subsequently, using the recovered tungsten oxide as a starting material, tungsten carbide has been produced by employing a self-propagating high-temperature synthesis (SHS) method. SHS is advantageous as it reduces the reaction time and is energy-efficient. Tungsten carbide with a carbon content of 6.18 wt % and a particle size of 116 nm has been successfully synthesized by optimizing the SHS process parameters, pulverization, and mixing. In this study, a series of processes for the highefficiency recycling and quality improvement of tungsten-based materials have been developed.

항균력과 보습력을 동시에 가지고 있는 화장품용 첨가제인 1, 2-octanediol (OD)의 피부 문제점을 개선하기 위하여 galactoside 유도체인 1, 2-octanediol galactoside (OD-gal)를 대장균 β -galactosidase (β-gal)을 이용하여 합성하였다. 이 때, β-gal은 4.5 U/ml, OD 농도는 150 mM, pH 는 7.0, 그리고, 온도는 37℃가 OD로부터 OD-gal을 합성하는 최적 조건이었다. 이 조건에 24 시간 동 안 150 mM의 OD로부터 약 55.9 mM의 OD-gal이 합성되었고, 이 때, conversion 수율(mole 기준)은 약 37.2% 였다. 또한, 9 ml의 반응액에서 67.4 mg의 순수한 OD-gal을 정제할 수 있었으며, 반응액에 들어 있는 OD에서부터 정제를 포함하는 전체 합성수율은 weight 기준으로는 약 34.1% 이고, mole 기 준으로는 약 16.2% 정도였다. 이러한 연구결과는 보다 안전한 화장품용 첨가제로서 OD-gal의 산업화 에 기초자료로서 도움을 줄 것으로 생각된다.

In this investigation, Bi2MoO6 deposited graphene nanocomposite (BMG) was synthesized using a simple microwave assisted hydrothermal synthesis method. The synthesized BMG nanocomposite was characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy with energy dispersive X-ray analysis, and photocurrent analysis. The study revealed that the catalysts prepared have high crystalline nature, enhanced light responsive property, high catalytic activity, and good stability. XRD results of BMG composite exhibit a koechlinite phase of Bi2MoO6. The surface property is shown by SEM and TEM, which confirmed a homogenous composition in the bulk particles of Bi2MoO6 and nanosheets of graphene. The catalytic behavior was investigated by the decomposition of Rhodamine B as a standard dye. The results exhibit excellent yields of product derivatives at mild conditions under ultrasonic/visible light-medium. Approximately 1.6-times-enhanced sono-photocatalytic activity was observed by introduction of Bi2MoO6 on graphene nanosheet compared with control sample P25 during 50 min test.

To improve light absorption ability in the visible light region and the efficiency of the charge transfer reaction, Pd nanoparticles decorated with reduced TiO2 nanotube photocatalyst were synthesized. The reduced TiO2 nanotube photocatalyst was fabricated by anodic oxidation of Ti plate, followed by an electrochemical reduction process using applied cathodic potential. For TiO2 photocatalyst electrochemically reduced using an applied voltage of -1.3 V for 10 min, 38% of Ti4+ ions on TiO2 surface were converted to Ti3+ ion. The formation of Ti3+ species leads to the decrease in the band gap energy, resulting in an increase in the light absorption ability in the visible range. To obtain better photocatalytic efficiency, Pd nanoparticles were decorated through photoreduction process on the surface of reduced TiO2 nanotube photocatalyst (r10-TNT). The Pd nanoparticles decorated with reduced TiO2 nanotube photocatalyst exhibited enhanced photocurrent response, and high efficiency and rate constant for aniline blue degradation; these were ascribed to the synergistic effect of the new electronic state of the TiO2 band gap energy induced by formation of Ti3+ species on TiO2, and by improvement of the charge transfer reaction.

다문화가정 학생 교육 지원 정책이 시행된 지 년이 15 지났다. 그 동안 각급 학교에서는 교사를 주축으 로 다문화교육이 시행되었고, 많은 시행착오들이 있었다. 이러한 시행착오들을 종합적으로 분석하여 새로 운 시사점을 얻기 위해 본 연구는 학교에서 다문화교육을 실제로 운영하는 교사들의 경험에 주목하여 다 문화교육 운영 실천 사례를 대상으로 질적 메타분석을 실시하였다. 메타분석의 대상으로 분석된 논문은 교사들이 다문화교육 운영 주체로서 실천과정에서 인식하는 문제점과 어려움, 발전 가능성에 대해 관심을 가지고 연구를 진행하였다. 질적 메타분석 연구를 통해서 질적연구가 가지는 개별연구에 내제된 다양한 한계점을 종합적인 분석틀로 해결하고 보다 일반화되고 확정적인 결과로 새로운 해석 가능성을 도출하고 자 하였다. 교사들의 다문화교육에 대한 경험을 중심으로 한 연구들은 대부분 교사의 다문화학생에 대한 경험 및 인식, 다문화교육프로그램 운영, 다문화교육 실행에 따른 효과, 다문화교육 실행의 어려움 등을 밝히고 추후 학교 다문화교육에 대한 방향제시를 위해 실행되었다. 결론적으로 교사들은 다문화교육 운영 에 있어서 업무과중을 다문화교육 운영의 가장 큰 어려움으로 꼽았고, 그 외에 운영에 있어 체계성 없는 다문화교육 시스템으로 인한 다양한 정보 부족, 인근학교 및 교사의 협조부족 등의 문제점이 있는 것으로 분석되었다. 결국, 체계화되지 못한 다문화교육은 정보와 자원 부족으로 드러났고, 이로 인해 교사들은 전 문성을 기르기 위해 독자적인 노력을 기울이게 되었다. 책임감에서 오는 이러한 노력들은 다시 또 교사들 의 업무를 과중하게 하는 결과를 낳았다. 이에 체계적인 다문화교육 시스템 도입이 요구되어 진다. 그 중 에서도 초보교사도 쉽게 활용가능한 다문화교육 가이드 라인 제공이 가장 시급하게 필요할 것으로 보인 다.

This work describes the facile synthesis of silver nanoparticle-decorated zinc oxide nanocomposite through a simple glycol reduction method. The silver nanoparticle-decorated zinc oxide nanocomposite-based pencil graphite electrode has been validated as a perceptive electrochemical sensing podium towards nitrite. The morphology of the prepared nanocomposite has been characterized via specific spectroscopic and electrochemical techniques. The sensor exhibits a notable enhancement in the cyclic voltammetric response to nitrite oxidation at an ideal peak potential of 0.76 V in pH 6.0 acetate buffer. Under optimum conditions of nitrite directly expanded with their concentration in the range from 30 to 1400 μM with a detection limit of 14 μM.

Anion assisted [4 + 2] cycloaddition reaction via indolo[2,3]-dienolate by reacting 1,2-dimethylindole-3-carboxaldehyde with aromatic nitriles using lithium diisopropylamide in terahydrofuran, a facile and convenient regiospecific route designed and developed for the synthesis of γ-carbolines.

2-에티닐-N-노나노일피리디늄 클로라이드를 치환기로 갖는 새로운 폴리아세틸렌 유도체를 합성하였다. 반응초기에 2-에티닐피리딘과 노나노일 클로아이드의 4차염화반응으로 생성된 단량체 종인 2-에티닐-N-노나노일피리디늄 클로라이드 는 별도의 촉매 없이도 중합반응이 잘 진행되었으며, 그결과 89%의 수율로 폴리아세틸렌계 이온성 공액구조 고분자를 합 성할 수 있었다. 여러 가지 분석장비를 이용하여 고분자 구조를 분석한 결과 설계한 치환기를 갖는 폴리아세틸렌 유도체 가 합성되었음을 확인할 수 있었다. 본 고분자는 메탄올, DMF, DMAc, DMSO, NMP 와 같은 극성 용매에 완전히 용해하였 으며, 이온성 측쇄 부분을 갖는 특성으로 다루는 과정에서 공기중 수분을 흡수하는 경향이 강했다. 고분자의 광흡수 및 전 기화학적 특성을 측정하고 분석하였다. 본 고분자는 산화-환원 피크 사이에 비가역적 전기화학적 거동을 보였으며 다른 이 온성 공액구조 고분자의 경우와 유사하게 전기화학적 스캔수를 증가한 실험에서 50회까지도 안정된 산화-환원 거동을 보 였다.

In this study, multilayered SnO nanoparticles are prepared using oleylamine as a surfactant at 165oC. The physical and chemical properties of the multilayered SnO nanoparticles are determined by transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). Interestingly, when the multilayered SnO nanoparticles are heated at 400oC under argon for 2 h, they become more efficient anode materials, maintaining their morphology. Heat treatment of the multilayered SnO nanoparticles results in enhanced discharge capacities of up to 584 mAh/g in 70 cycles and cycle stability. These materials exhibit better coulombic efficiencies. Therefore, we believe that the heat treatment of multilayered SnO nanoparticles is a suitable approach to enable their application as anode materials for lithium-ion batteries.

본 연구의 목적은 최근 국내외 사회복지분야에 새롭게 소개된 질적 해석적 메타통합(QIMS)을 적용하여 한국노인이 인식하는 삶의 질에 관한 새로운 의미를 탐색하는 것이다. 한국노인의 삶의 질은 재발성 노인질환, 생활습관과 선택, 인구고령화와 기대수명 연장, 급속한 사회변화 등 다양한 요인에 의해 부정적 또는 긍정적인 영향을 받는다. 본 연구는 질적 해석적 메타통합의 체계적인 과정을 통해 한국노인의 삶의 질과 관련된 위험요인과 보호요인을 강조 하고 탐색하는 것을 전제로 기존의 개별 질적 연구결과를 통합한 후 재해석하여 종합하였다. 연구결과는 다음과 같다. (1) 다양한 삶의 경험들, (2) 안녕한 상태 유지하기, (3) 스스로 더 잘 돌봄, (4) 삶에 대한 새로운 관점 갖기를 포 함한 4개의 독립적이고 포괄적인 주제가 창출되었다. 이러한 연구결과를 토대로 향후 한국노인의 특성을 고려한 삶의 질 이론 개발에 기여할 뿐만 아니라 노인복지, 장애인복지 등 사회복지실천영역의 연구자 및 전문가들이 노인의 삶의 질과 관련된 유지 및 향상요인을 강화하는데 더 큰 이해를 제공하고자 한다.