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Advancing Energy Systems with In-Situ and Operando Surface-Enhanced Raman Scattering Spectroscopy

CCS Chemistry 2024年第6期6卷 1403-1421页

作者： Haoming Bao Shi Xuan Leong Jaslyn Ru Ting Chen Zhenhai Shi Suli Chen Yan Lv Tianxi Liu in yee phang Xing Yi Ling Key Laboratory of Synthetic and Biological Colloids Ministry of EducationInternational Joint Research Laboratory for Nano Energy CompositesSchool of Chemical and Material EngineeringJiangnan UniversityWuxi 214122 School of Chemistry Chemical Engineering and BiotechnologyNanyang Technological UniversitySingapore 637371

Surface-enhanced Raman scattering spectroscopy(SERS)has emerged as a powerful analytical technique to enable nanoscale investigations of energy *** mini-review focuses on the applications of in-situ and operando SERS in energy-related research,highlighting its unique capabilities and significant contributions to understanding energy storage and conversion *** first introduce the fundamental principles of SERS,key SERS-derived techniques,and commonly employed ***,we delve into the diverse applications of in-situ and operando SERS across various energy systems,encompassing photocatalytic and electrocatalytic systems,fuel cells,solar cells,and ***,we conclude with our perspective on the current challenges and prospects in this *** hope thismini-review serves as an essential overview to guide the design and implementation of in-situ and operando SERS studies of energy systems.

关键词： surface-enhanced Raman scattering spectroscopy in-situ operando energy systems photocatalysis electrocatalysis fuel cells solar cells batteries

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Studies on Crystal Transition of Polyamide 11 Nanocomposites by Variable-temperature X-Ray Diffraction

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Chinese Journal of Polymer Science 2014年第1期32卷 115-122页

作者：刘天西 Dan Chen in yee phang 韦春 Key Laboratory of New Processing Technology for Nonferrous Metals and Materials Ministry of Education College of Materials Science and Engineering Guilin University of Technology State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science Fudan University Institute of Materials Research and Engineering A*STAR (Agency for Science Technology and Research)

Polyamide I1 （PAll） and its nanocomposites with different organoclay loadings were prepared by melt-compounding and subsequent pelletizing. The crystal phase transitions of PAl 1 and its clay nanocomposites were investigated by variable-temperature X-ray diffraction. It was found that the Brill transition of the nanocomposite was 20 K higher than that of the neat PAl 1 for both heating and cooling processes. The PAl 1 d-spacings of the nanocomposites were observed to be smaller than those of the neat PAl 1 for melt crystallization. The constraints imposed by the addition of layered clay, restricting the thermal expansion of the polymer chains, are probably responsible for such a reduction of the d-spacing.

关键词： Polyamide 11 Clay Nanocomposites Crystal transition Variable-temperature X-ray diffraction.

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MORPHOLOGY AND MECHANICAL PROPERTIES OF HIGH PERFORMANCE NYLON-6 COMPOSITES REINFORCED BY MULTIWALLED CARBON NANOTUBES

MORPHOLOGY AND MECHANICAL PROPERTIES OF HIGH PERFORMANCE NYL...

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Asia Conference on Nanoscience and Nanotechnology Abstracts Book

作者： in yee phang SHUE YIN CHOW Institute of Materials Research and Engineering Singapore 117602Republic of Singapore Institute of Materials Research and Engineering Singapore 117602Republic of Singapore

＜正＞ Since the discovery of carbon nanotubes （CNTs） by Iijima in 1991, increasing attention has been attracted to this newly emerging material due to its remarkable mechanical and electrical properties. Based on their unique and excellent physical properties, many structural and smart applications of CNTs have been proposed including transistors, sensors, and field emission devices, as well as lighter, smaller and higher performance structures for aerospace and many other industrial fields. Among them, one of the most intriguing applications of CNTs is the polymer/CNTs nanocomposites. However, the challenges for developing high performance CNTs/polymer composites are: （i） homogeneous dispersion of CNTs in the matrix, and （ii） strong interfacial interactions so as to effect efficient load transfer from the polymer matrix to the CNTs.

关键词： Carbon nanotubes composites mechanical properties.

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大叶藤黄醇的全合成研究

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有机化学 2021年第11期41卷 4421-4427页

作者：王学颖盘伊琳郑昌武徐宏喜上海中医药大学中药学院上海201203

多环多异戊烯基间苯三酚(PPAPs)类天然产物大叶藤黄醇(xanthochymol)具有良好的抗癌和抗菌活性,目前没有任何关于其全合成的研究报道.本研究以3,3-二甲基戊二酸为起始原料,通过一系列步骤制备线性链状底物,再应用串联Dieckmann缩合反应... 详细信息

多环多异戊烯基间苯三酚(PPAPs)类天然产物大叶藤黄醇(xanthochymol)具有良好的抗癌和抗菌活性,目前没有任何关于其全合成的研究报道.本研究以3,3-二甲基戊二酸为起始原料,通过一系列步骤制备线性链状底物,再应用串联Dieckmann缩合反应构建双环[3.3.1]壬烷-2,4,9-三酮核心骨架.此方法成功地以11步反应实现了消旋体大叶藤黄醇的全合成,以10%的总收率得到了目标产物.通过本研究得到大叶藤黄醇侧链的一对非对映异构体,在^(1)H NMR、^(13)C NMR谱图上明确了它们之间的区别,也对未来分离鉴定和区分其侧链结构异构体提供了参考数据.

关键词：多环多异戊烯基间苯三酚(PPAPs) 双环[3.3.1]壬烷 Dieckmann缩合串联反应

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Sonication and grinding pre-treatments on Gelidium amansii seaweed for the extraction and characterization of Agarose

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Frontiers of Environmental Science & Engineering 2018年第4期12卷 17-23页

作者： Kit Wayne Chew Pau Loke Show yee Jiun Yap Joon Ching Juan Siew Moi phang Tau Chuan Ling Jo-Shu Chang Department of Chemical and Environmental Engineering Faculty of Engineering University of Nottingham Malaysia Campus Jalan Broga 43500 Semenyih Selangor Darul Ehsan Malaysia Bioseparation Research Group Faculty of Engineering University of Nottingham Malaysia Campus Jalan Broga 43500 Semenyih Selangor Darul Ehsan Malaysia Department of Applied Mathematics Faculty of Engineering University of Nottingham Malaysia Campus Jalan Broga 43500 Semenyih Selangor Darul Ehsan Malaysia Nanotechnology & Catalysis Research Centre (NANOCAT) Institute of Postgraduate Studies University of Malaya 50603 Kuala Lumpur Malaysia Institute of Ocean and Earth Sciences University of Malaya 50603 Kuala Lumpur Malaysia Institute of Biological Sciences University of Malaya 50603 Kuala Lumpur Malaysia Department of Chemical Engineering National Cheng Kung University Tainan 701 Taiwan China

Various prctreatments methods including sonication and grinding were perfonned on red seaweed Gelidium amansii for the subsequent extraction ofagarose. The agarose products are usually extracted from agar powder products from seaweeds. In this study, the agarose was extracted using a direct polyethylene glycol （PEG） method without the need to first process the agar from seaweed. The agar extract was frozen then thawed and mixed directly with PEG solution to precipitate the agarose. The quality of agarose obtained was evaluated through physico-chemical properties analysis which includes spectral technique （FTIR）, melting and boiling point, gel strength and sulfate content. These properties were compared with a non-pretreated sample and it was found that the addition of pretreatment steps improved the quality of agarosc but gave a slightly lower yield. The gel strength of pretreated samples was much higher and the sulfate content was lower compared to non-pretreated samples. The best pretreatment method was sonication which gave gel strength of 742 gcm - and sulfate content of 0.63%. The extraction of agarose can be further improved with the use of different neutralizing agents. Pretreating the seaweed shows potential in improving the quality of agarosc from seaweed and can be applied for thture extraction of the agarose.

关键词： AgaroseGe lidium Pretreatment Seaweed Sonication

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Cloning of a novel phytase from an anaerobic rumen bacterium, Mitsuokella jalaludinii, and its expression in Escherichia coli

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Journal of Integrative Agriculture 2015年第9期14卷 1816-1826页

作者： TAN Wan-qin phang Chiun yee Sieo Chin Chin Yiap Beow Chin Clemente Michael Wong Vui Ling Norhani Abdullah Son Radu Ho Yin Wan Laboratory of Vaccines and Immunotherapeutics Institute of BioscienceUniversiti Putra Malaysia Department of Microbiology Faculty of Biotechnology and Biomolecular SciencesUniversiti Putra Malaysia Department of Life Sciences School of Pharmacy and HealthFaculty of Medicine and HealthInternational Medical University Biotechnology Research Institute Universiti Malaysia Sabah Institute of Tropical Agriculture Universiti Putra Malaysia Department of Biochemistry Faculty of Biotechnology and Biomolecular SciencesUniversiti Putra Malaysia Department of Food Science Faculty of Food Science and TechnologyUniversiti Putra Malaysia

The ful length phytase gene of Mitsuokel a jalaludini was successful y cloned and was found to be 1 047 bp in length, with 348 amino acids, and was designated as PHY7 phytase gene. A comparison of the sequence of PHY7 phytase gene of M. jalaludini with various microbial phytase gene sequences showed that it was not similar to those from other bacteria except Selenomonas ruminatium, thus suggesting that they may both express a new class of phytase. The PHY7 phytase gene was subsequently subcloned into bacterial expression vector, pET32a, for expression in Escherichia coli strain Ro-setta-gami. Expression of the recombinant phytase gene was optimised and characterised. The recombinant phytase was estimated to be approximately 55 kDa by SDS-PAGE analysis. The recombinant phytase exhibited optimum activity at 55°C, pH 4.5 and showed good pH stability from pH 3.5 to 5.5 (>78%relative activity). Metal ions such as Ca2+, Mg2+, and K+were found to exert signiifcant stimulatory effect on the recombinant phytase activity while Cu2+, Fe3+, and Zn2+greatly inhibited the enzyme activity. The recombinant phytase showed moderate resistance to trypsin proteolysis, but susceptible to pepsin proteolysis. The results of the study showed that several characteristics of recombinant phytase were slightly different from the native enzyme. Unfavourable characteristics such as reduced pH stability and metal ion effects should be taken into consideration during feed enzyme formulation.

关键词： phytase cloning recombinant Escherichia coli Mitsuokella jalaludinii

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