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Intensive-visible-light-responsive ANbO_(2)N(A = Sr, Ba) synthesized from layered perovskite A_(5)Nb_(4)O_(15) for enhanced photoelectrochemical water splitting

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Journal of Energy Chemistry 2022年第5期31卷 529-537页

作者： sukanya Ramaraj Jeongsuk Seo Departmentof Chemistry.College of Natural Sciences Chonnam National University.77 Yongbong-ro Buk-gu Gwangju 61186Republicof Korea

Nb-based, perovskite-type oxynitrides ANb(O,N)_(3)(A = Sr, Ba) have been significantly attractive semiconductor materials for photoelectrochemical(PEC) water splitting due to their absorption abilities of intensive-visible-light. However, PEC activities of these perovskites are relatively low due to reduction of Nb species during nitridation leading to the generation of anion defects and impurity ***, we propose nitridation of A-rich, layered perovskite A_(5)Nb_(4)O_(15) as starting oxides for general synthesis of photoactive ANbO_(2)N. These layered perovskite A_(5)Nb_(4)O_(15) were completely transformed to single phase perovskite-type ANbO_(2)N by nitridation. Wavelength onsets of light absorption were observed at 700 nm for SrNbO_(2)N and at 740 nm for BaNbO_(2)N. According to X-ray photoelectron spectroscopy results,excess Lewis base A species significantly suppressed the generation of reduced species such as Nb^(4+) and Nb^(3+)during nitridation, although it led to an amorphous surface of the as-prepared *** annealing in Ar largely enhanced surface crystallinity of ANbO_(2)N. As a result, Co(OH)_(x)/ANbO_(2)N/FTO photoanodes, prepared by loading Co(OH)_(x) electrocatalyst, showed high photocurrent density of 1.6(A = Sr) and 2.4 m A cm^(-2)(A = Ba) at 1.23 VRHEunder AM 1.5 G simulated sunlight. These results demonstrate that A-rich layered perovskite A_(5)Nb_(4)O_(15)are effective starting precursors for preparing lowdefective ANbO_(2)N, thus improving PEC water splitting activity.

关键词： Perovskite-type oxynitride CaNbO_(2)N SrNbO_(2)N BaNbO_(2)N A-rich starting oxide Surface heat treatment Ar annealing Solar water oxidation

Optimization of Caesalpinia sappan L. heartwood extraction procedure to obtain the highest content of brazilin and greatest antibacterial activity

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Journal of Integrative Medicine 2019年第5期17卷 351-358页

作者： sukanya Settharaksa Chaowalit Monton Laksana Charoenchai Drug and Herbal Product Research and Development Center College of Pharmacy Rangsit University

Objective: The objective of the work was to optimize the extraction conditions of Caesalpinia sappan *** in order to maximize the brazilin content and antibacterial activity of the ***: Two independent factors were studied: extraction temperature(45–95 °C) and extraction time(30–60 min). In addition, five dependent factors were monitored, including extraction yield, brazilin content, and clear zones against Staphylococcus aureus TISTR 1466, Staphylococcus epidermidis TISTR 518 and Propionibacterium acnes DMST 14961. The brazilin content was quantified by high-performance liquid chromatography and antibacterial activity was determined by disk diffusion ***: The high temperature provided high total extract yield as well as brazilin content, while extraction time had little effect on yield or brazilin content. Extraction time had a positive effect, while extraction temperature had little effect on clear zone against S. aureus. The largest clear zone against S. epidermidis was achieved at low extraction temperature and long extraction time. Conversely, short extraction time and high extraction temperature provided the largest clear zone against P. acnes. The optimal conditions providing the highest brazilin content was an extraction temperature and extraction time of 95 °C and 30 min, *** same optimal conditions also provided the simultaneous greatest antibacterial activity against the three bacteria. Modeled optimal conditions were validated be conducting extraction using these values. Yield and antibacterial activity of the resulting extract demonstrated that the model had a low percentage ***: The optimal condition will be used as a standard condition for extraction of C. sappan heartwood to maximize brazilin content and antibacterial activity.

关键词： Antibacterial activity Brazilin Caesalpinia sappan Optimization

Studies on Epoxidised Castor Oil as Co-Plasticizer with Epoxidised Soyabean Oil for PVC Processing

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Journal of Renewable Materials 2019年第8期7卷 775-785页

作者： Gouni Thirupathiah sukanya Satapathy Aruna Palanisamy Polymers&Functional Materials Division Indian Institute of Chemical TechnologyUppal RoadTarnakaHyderabad500007Telangana StateIndia

An acidic cation exchange resin has been used to prepare epoxidised castor oil(ECO)which was used as a co-plasticizer with epoxidised soyabean oil(ESBO)for processing polyvinyl chloride(PVC).The structure of ECO was confirmed and its physico chemical properties were ***/(ESBO&ECO)blends were prepared by melt mixing and compression molded into *** specimens were evaluated for tensile properties,impact strength and *** the tensile strength did not vary much,the elongation reduced with the replacement of ESBO with *** mechanical studies revealed that the glass transition temperature increased with incorporation of ECO,however,the storage modulus was not altered *** 20%of ESBO with ECO resulted in blends with desired thermal and mechanical properties without affecting the processability of PVC.

关键词： PVC plasticizer epoxidised castor oil tensile strength

Unraveling effects of electron correlation in two-dimensional Fe_(n)GeTe_(2)(n=3,4,5)by dynamical mean field theory

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npj Computational Materials 2023年第1期9卷 1453-1468页

作者： sukanya Ghosh Soheil Ershadrad Vladislav Borisov Biplab Sanyal Department of Physics and Astronomy Uppsala UniversityBox-51675120 UppsalaSweden

The Fe_(n)GeTe_(2) systems are recently discovered two-dimensional van-der-Waals materials,exhibiting magnetism at room *** sub-systems belonging to Fe_(n)GeTe_(2) class are special because they show site-dependent magnetic *** focus on the critical evaluation of magnetic properties and electron correlation effects in Fe_(n)GeTe_(2)(n=3,4,5)(FGT)systems performing first-principles *** different ab initio approaches have been used primarily,viz.,(i)standard density functional theory(GGA),(ii)incorporating static electron correlation(GGA+U)and(iii)inclusion of dynamic electron correlation effect(GGA+DMFT).Our results show that GGA+DMFT is the more accurate technique to correctly reproduce the magnetic interactions,experimentally observed transition temperatures and electronic *** inaccurate values of magnetic moments,exchange interactions obtained from GGA+U make this method inapplicable for the FGT *** determination of magnetic properties for this class of materials is important since they are promising candidates for spin transport and spintronic applications at room temperature.

关键词： temperature theory dimensional

Low-carbon city communication:Integrated strategies for urban and rural municipalities in Thailand

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Chinese Journal of Population,Resources and Environment 2020年第1期18卷 16-25页

作者： sukanya Sereenonchai Noppol Arunrat Thomas Neal Stewart Faculty of Environment and Resource Studies Mahidol UniversitySalayaNakhon Pathom73170Thailand

As an important sustainable development goal,the creation of low-carbon cities(LCCs)has become crucial to creating livable cities and environmental ***,we aimed to understand the factors that support the transition of traditional cities to LCCs,by analyzing and synthesizing how to promote practical LCC across 15 pilot municipalities in four regions of Thailand,covering four strategies:City of Trees,City of Waste Minimization,City of Energy Efficiency,and City of Sustainable *** research,in-depth interviews,and observations were employed for data collection,while the 5W(who,says what,in which channel,to whom,and with what effect)and SMCR(sender,message,channel,and receiver)models were used to create a communication analysis *** revealed that the effective activities of municipalities should increase tree planting and implement more serious regulations for the conservation of existing *** compost and establishing waste recycling banks are recommended for rural municipalities,while optimization of garbage and wastewater management systems and facilities should be highlighted in urban ***,recycling,low-carbon agriculture,second-hand shops/markets,green markets,and homegrown vegetables should be encouraged for sustainable *** with local municipalities,credible leaders and representatives were the key ***,message design should compare the pros and cons of behaviors,connect with local health and tourism,and promote dialogue in easy-to-understand and thought-provoking *** that drive LCC should have an excellent understanding of LCC practice and its benefits,be public-minded,and have a desire to live in a good environment.

关键词： Low-carbon city Low-carbon communication Integrated strategies Urban and rural municipalities Thailand

Bamboo-derived hard carbon/carbon nanotube composites as anode material for long-life sodium-ion batteries with high charge/discharge capacities

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Rare Metals 2024年第1期43卷 124-137页

作者： sukanya Pothaya Chatwarin Poochai Nantikan Tammanoon Yaowamarn Chuminjak Tanaporn kongthong Tanom Lomas Chakrit Sriprachuabwong Adisorn Tuantranont Graphene and Printed Electronics for Dual-Use Applications Research Division(GPERD) National Security and Dual-Use Technology Center(NSD)National Science and Technology Development Agency(NSTDA)Tambon Klong NuengAmphoe Klong LuangPathum Thani 12120Thailand

Hard carbon derived from bamboo for the anode material of sodium-ion batteries has a three-dimensional(3D) open framework structure and has naturally incorporated k-ions into its carbon structure,increasing the dinterlayer spacing of hard carbon materials for facilitating Na^(+) *** this work,bamboo-derived hard carbon was prepared via two carbonization temperatures at 700and 1000 ℃ for an hour and employed as an anode for sodium-ion batteries(SIB).X-ray diffraction(XRD) and Fourier transform(FT)-Raman spectroscopic results indicated the disordered structure with d-spacing(d_(002)) around0.36-0.37 nm,which is a benefit for sodium ion insertion/***,the composition between carbon-nanotube(CNT) and bamboo-derived hard carbon(BB) was synthesized by a ball mill with various contents of CNT(1 wt%,5 wt% and 10 wt%).At the optimal CNT content of 5 wt%,the sample exhibited excellent performance and outstanding *** the anode,the half-cell SIB using BB(700)w@5%CNT(with a carbonization temperature of700 ℃ and CNT loading of 5 wt%) delivered a high initial specific capacity of 268.9 mAh·g^(-1) at 0.1C and capacity retention of 78.6% after 500 cycles at *** full cell SIB fabrication BB(700)w@5%CNT in combination with Na_(3)V_(2)(PO4)_(3) as the cathode demonstrated a high specific capacity of 127.6 mAh·g^(-1) at 0.2C with its capacitive retention remaining of 78% at 1.0C after 1000 *** attained storage performance indicates that hard carbonCNT composite anode material enhanced the conductive path of electron transport and provided long-term cycling *** good electrochemical performance as well as the low cost and environment-friendliness of the bambooderived hard carbon proves its suitability for future sodium-ion batteries.

关键词： Hard carbon Bamboo Sodium-ion battery(SIB) Full cell

Erythropoietin modulates bone marrow stromal cell differentiation

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Bone Research 2019年第3期7卷 272-285页

作者： sukanya Suresh Luis Fernandez de Castro Soumyadeep Dey Pamela G. Robey Constance Tom Noguchi Molecular Medicine Branch National Institute of Diabetes and Digestive and Kidney Diseases National Institutes of Health Bethesda MD 20892 USA Skeletal Biology Section National Institute of Dental and Craniofacial Research National Institutes of Health Bethesda MD 20892 USA

Erythropoietin is essential for bone marrow erythropoiesis and erythropoietin receptor on non-erythroid cells including bone marrow stromal cells suggests systemic effects of erythropoietin. Tg6 mice with chronic erythropoietin overexpression have a high hematocrit, reduced trabecular and cortical bone and bone marrow adipocytes, and decreased bone morphogenic protein 2 driven ectopic bone and adipocyte formation. Erythropoietin treatment(1 200 IU·kg–1) for 10 days similarly exhibit increased hematocrit,reduced bone and bone marrow adipocytes without increased osteoclasts, and reduced bone morphogenic protein signaling in the bone marrow. Interestingly, endogenous erythropoietin is required for normal differentiation of bone marrow stromal cells to osteoblasts and bone marrow adipocytes.ΔEpoR_E mice with erythroid restricted erythropoietin receptor exhibit reduced trabecular bone, increased bone marrow adipocytes, and decreased bone morphogenic protein 2 ectopic bone formation. Erythropoietin treated ΔEpoR_E mice achieved hematocrit similar to wild-type mice without reduced bone, suggesting that bone reduction with erythropoietin treatment is associated with non-erythropoietic erythropoietin response. Bone marrow stromal cells from wild-type,Tg6, and ΔEpoR_E-mice were transplanted into immunodeficient mice to assess development into a bone/marrow organ. Like endogenous bone formation, Tg6 bone marrow cells exhibited reduced differentiation to bone and adipocytes indicating that high erythropoietin inhibits osteogenesis and adipogenesis, while ΔEpoR_E bone marrow cells formed ectopic bones with reduced trabecular regions and increased adipocytes, indicating that loss of erythropoietin signaling favors adipogenesis at the expense of osteogenesis. In summary, endogenous erythropoietin signaling regulates bone marrow stromal cell fate and aberrant erythropoietin levels result in their impaired differentiation.

关键词： bone marrow adipocyte normal differentiation

Effect of heat-moisture treatment to raw paddy rice(Oryza sativa L.)On cooked rice properties

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Journal of Future Foods 2021年第2期1卷 179-186页

作者： sukanya Thuengtung Sunantha ketnawa Yichen Ding Yukiharu Ogawa Gratuate School of Horticulture Chiba UniversityMatsudo 271-8501Japan Faculty of Medicine Chiang Mai UniversityChiang Mai 50200Thailand

Heat moisture treatment is safe and non-chemical use method for modifying physicochemical properties and digestibility of *** starch digestion in rice product would provide numerous health benefi ts for the *** study investigated the heat-moisture treatment to the raw paddy rice at 60 and 80ºC for 4 and 24 h,and their effects on the attributes of cooked *** fi rmness,adhesiveness,starch hydrolysis and morphological changes during in vitro digestion were *** showed that heat-moisture treatment to raw paddy rice for 24 h signifi cantly reduced the moisture content and could increase the total starch content of the rice *** apparent amylose content ranged from 23.83%to 25.65%at the variation in the values between treated and untreated *** in the firmness and reduction in the starch hydrolysis was found in rice treated by longer heating time of 24 ***,the adhesiveness of cooked rice was decreased when increasing the heating *** morphological observation showed that the treated rice exhibited a honey-comb-like structure during simulated gastric digestion,while the untreated rice displayed a non-uniform ***,the porous structure observed in all digested rice grains during simulated small intestinal digestion could favor the starch *** study showed that the heat-moisture treatment to the raw paddy rice at certain conditions obviously influenced the attributes of cooked rice,especially on the starch hydrolysis,which would provide a fundamental knowledge to enable development and improvement of slow digestion rice products.

关键词： Heat-moisture treatment Paddy rice Simulated in vitro digestion Physicochemical property Starch hydrolysis

Production of fermented tea petal decoction with insights into in vitrobiochemical tests,antioxidant assay and GC-MS analysis

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Food Production, Processing and Nutrition 2021年第1期3卷 406-415页

作者： Soumya Majumder Sumedha Saha Arindam Ghosh sukanya Acharyya Sahadeb Sarkar Sourav Chakraborty Malay Bhattacharya Molecular Biology and Tissue Culture Laboratory Department of Tea ScienceUniversity of North BengalSiliguriDarjeelingWest Bengal Pin-734013India

This research work was designed to attempt and propose the first report on production and biochemical characterization of fermented tea flower petal decoction or simply tea petal *** tea petal decoction and brewer’s yeast or Saccharomyces cerevisiae were co-cultured for *** activity and chromatographic separation of potential candidates were *** investigations for qualitative characters on this fermented broth revealed the presence of steroids,tannin,flavonoids,phenol,cardiac glycosides,coumarin,caffeine *** manufactured fermented broth showed high free radical scavenging activity after 2 months of *** DPPH scavenging activities were also observed in solvent fractions of acetone,ethanol and *** antioxidant activity,alcohol percentage and other qualities were seen to be gradually increased during *** chromatography-mass spectrometry analysis revealed the presence of 44 compounds including many potential antioxidant molecules and other bioactive ***,presence of alcohol with medicinally active compounds and antioxidant activity will make it as acceptable as a good wine and tea flower as economically functional.

关键词： Tea petal Antioxidant GC-MS Fermentation brewer’s yeast