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Article ; Online: Plastic Waste Management

Rizki Rinanda / Yunan Sun / Keke Chang / Rini Sulastri / Xiaoqiang Cui / Zhanjun Cheng / Beibei Yan / Guanyi Chen

Sustainability, Vol 15, Iss 24, p

A Bibliometric Analysis (1992–2022)

2023 Volume 16840

Abstract: Plastic waste management has emerged as an urgent global challenge, that has attracted significant attention from researchers, policymakers, and stakeholders. Conducting a bibliometric study on this issue aims to provide a holistic and in-depth ... ...

Abstract	Plastic waste management has emerged as an urgent global challenge, that has attracted significant attention from researchers, policymakers, and stakeholders. Conducting a bibliometric study on this issue aims to provide a holistic and in-depth bibliometric mapping and analysis of plastic waste management, carefully traced through the Web of Science. Expansive data comprising scientific production by researchers, country/region contributions, affiliations, author references, and topical trends were meticulously scrutinized using the VOSviewer software (version 1.6.15). The exploration of bibliometric studies in plastic waste management is still limited, and this forms the basis of our commitment to explore this field in more depth. The findings in this study showed a progressive increase in the number of published works from 1992 to 2022, using the main keyword “plastic waste management” and 13,103 documents were found that were further analyzed. This demonstrates the profound impact of Chinese scientists on plastic waste management research, as evidenced by their prevalence as top affiliated authors. Given the increasing concern and heightened government and societal attention towards plastic pollution and water contamination, effective waste management, with a particular focus on plastic waste, emerged as the most influential keyword. This comprehensive analysis contributes to the existing literature by highlighting key trends and the urgent need for concerted efforts to address the challenges posed by plastic waste.
Keywords	bibliometric analysis ; plastic waste ; waste management ; plastic pollution ; Environmental effects of industries and plants ; TD194-195 ; Renewable energy sources ; TJ807-830 ; Environmental sciences ; GE1-350
Subject code	710
Language	English
Publishing date	2023-12-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Aptamer-functionalized AuNPs for the high-sensitivity colorimetric detection of melamine in milk samples.

Xinran Hu / Keke Chang / Shun Wang / Xiaoquan Sun / Jiandong Hu / Min Jiang

PLoS ONE, Vol 13, Iss 8, p e

2018 Volume 0201626

Abstract: Although aptamer-functionalized AuNPs technology exhibits great potential in analytical and biological chemistry, direct analysis of molecules at a low concentration using colorimetric assay remains challenging. The development of intuitive methods has ... ...

Abstract	Although aptamer-functionalized AuNPs technology exhibits great potential in analytical and biological chemistry, direct analysis of molecules at a low concentration using colorimetric assay remains challenging. The development of intuitive methods has attracted interest for promising detection of melamine in milk samples due to a demand for stable and understandable process. In this study, we propose a rapid and facile colorimetric measurement method of melamine combined aptamer-functionalized AuNPs in contaminated milk samples. To realize the high stability and the lower limit of detection, the aptamer-functionalized surface of AuNPs via a coordinated bond was used in combination with ultra-sonication. The kinetics of this colorimetric assay based on aptamer-functionalized AuNPs was analyzed to illustrate that the higher the concentration of melamine, the faster the aggregation of AuNPs induced. The sensitivity, selectivity, limit of detection and recovery rate were sufficiently validated to understand the measurement principle of melamine using aptamer-functionalized AuNPs. The calibration curve established by the absorption peak ratio (A640 /A520) was linear in the concentration range of 0~1μM of melamine in aqueous solutions with the correlation coefficient (R2) of 0.986 and the limit of detection (LOD) of 22 nM, whereas, the correlation coefficient (R2) of 0.998 and the LOD of 14.9 nM were achieved at the concentration of melamine below 0.5 μM in milk samples. The optimized performance of this colorimetric assay of melamine using aptamer-functionalized AuNPs in milk samples was obtained with 100 μL of 13 nm AuNPs solution, 40 μL of 1 μM (100 dilutions) aptamers and the pre-reaction time of 30 min. This simple colorimetric measurement of melamine using aptamer-functionalized AuNPs provides a promising target for various applications of the sample source with complex sample matrices.
Keywords	Medicine ; R ; Science ; Q
Subject code	500
Language	English
Publishing date	2018-01-01T00:00:00Z
Publisher	Public Library of Science (PLoS)
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Metastable phase formation of Pt-X (X = Ir, Au) thin films

Aparna Saksena / Yu-Chuan Chien / Keke Chang / Pauline Kümmerl / Marcus Hans / Bernhard Völker / Jochen M. Schneider

Scientific Reports, Vol 8, Iss 1, Pp 1-

2018 Volume 10

Abstract: Abstract The dependence of phase formation and mechanical properties on the chemical composition has been investigated for Pt-Ir and Pt-Au combinatorial thin films. The formation of a single, metastable Pt-Ir solid solution has been observed for all ... ...

Abstract	Abstract The dependence of phase formation and mechanical properties on the chemical composition has been investigated for Pt-Ir and Pt-Au combinatorial thin films. The formation of a single, metastable Pt-Ir solid solution has been observed for all experimental compositions and temperatures. Upon Ir addition to Pt the experimentally determined changes in lattice parameter and Young’s modulus display rule of mixture behavior which is in good agreement with our ab initio data. Whereas, in the Pt-Au system, the single metastable solid solution decomposes into two phases as the growth temperature is raised to ≥600 °C. The lattice parameters in the dual phase region are independent of chemical composition. The substrate temperature and chemical composition dependent phase formation in Pt-Ir and Pt-Au thin films can be rationalized based on CALPHAD (CALculation of PHAse Diagrams) results combined with estimations of the activation energy required for surface diffusion: The metastable phase formation during film growth is caused by kinetic limitations, where Ir atoms (in Pt-Ir) need to overcome an up to factor 6 higher activation energy barrier than Au (in Pt-Au) to enable surface diffusion.
Keywords	Medicine ; R ; Science ; Q
Subject code	669
Language	English
Publishing date	2018-07-01T00:00:00Z
Publisher	Nature Publishing Group
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Macroscale Superlubricity Enabled by Graphene‐Coated Surfaces

Zhenyu Zhang / Yuefeng Du / Siling Huang / Fanning Meng / Leilei Chen / Wenxiang Xie / Keke Chang / Chenhui Zhang / Yao Lu / Cheng‐Te Lin / Suzhi Li / Ivan P. Parkin / Dongming Guo

Advanced Science, Vol 7, Iss 4, Pp n/a-n/a (2020)

2020

Abstract: Abstract Friction and wear remain the primary modes for energy dissipation in moving mechanical components. Superlubricity is highly desirable for energy saving and environmental benefits. Macroscale superlubricity was previously performed under special ... ...

Abstract	Abstract Friction and wear remain the primary modes for energy dissipation in moving mechanical components. Superlubricity is highly desirable for energy saving and environmental benefits. Macroscale superlubricity was previously performed under special environments or on curved nanoscale surfaces. Nevertheless, macroscale superlubricity has not yet been demonstrated under ambient conditions on macroscale surfaces, except in humid air produced by purging water vapor into a tribometer chamber. In this study, a tribological system is fabricated using a graphene‐coated plate (GCP), graphene‐coated microsphere (GCS), and graphene‐coated ball (GCB). The friction coefficient of 0.006 is achieved in air under 35 mN at a sliding speed of 0.2 mm s−1 for 1200 s in the developed GCB/GCS/GCP system. To the best of the knowledge, for the first time, macroscale superlubricity on macroscale surfaces under ambient conditions is reported. The mechanism of macroscale superlubricity is due to the combination of exfoliated graphene flakes and the swinging and sliding of the GCS, which is demonstrated by the experimental measurements, ab initio, and molecular dynamics simulations. These findings help to bridge macroscale superlubricity to real world applications, potentially dramatically contributing to energy savings and reducing the emission of carbon dioxide to the environment.
Keywords	ambient conditions ; graphene ; macroscale superlubricity ; macroscale surfaces ; molecular dynamics ; Science ; Q
Subject code	541
Language	English
Publishing date	2020-02-01T00:00:00Z
Publisher	Wiley
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Colorimetric detection of melamine in milk by using gold nanoparticles-based LSPR via optical fibers.

Keke Chang / Shun Wang / Hao Zhang / Qingqian Guo / Xinran Hu / Zhili Lin / Haifeng Sun / Min Jiang / Jiandong Hu

PLoS ONE, Vol 12, Iss 5, p e

2017 Volume 0177131

Abstract: A biosensing system with optical fibers is proposed for the colorimetric detection of melamine in liquid milk samples by using the localized surface plasmon resonance (LSPR) of unmodified gold nanoparticles (AuNPs). The biosensing system consists of a ... ...

Abstract	A biosensing system with optical fibers is proposed for the colorimetric detection of melamine in liquid milk samples by using the localized surface plasmon resonance (LSPR) of unmodified gold nanoparticles (AuNPs). The biosensing system consists of a broadband light source that covers the spectral range from 200 nm to 1700 nm, an optical attenuator, three types of 600 μm premium optical fibers with SMA905 connectors and a miniature spectrometer with a linear charge coupled device (CCD) array. The biosensing system with optical fibers is low-cost, simple and is well-proven for the detection of melamine. Its working principle is based on the color changes of AuNPs solution from wine-red to blue due to the inter-particle coupling effect that causes the shifts of wavelength and absorbance in LSPR band after the to-be-measured melamine samples were added. Under the optimized conditions, the detection response of the LSPR biosensing system was found to be linear in melamine detection in the concentration range from 0μM to 0.9 μM with a correlation coefficient (R2) 0.99 and a detection limit 33 nM. The experimental results obtained from the established LSPR biosensing system in the actual detection of melamine concentration in liquid milk samples show that this technique is highly specific and sensitive and would have a huge application prospects.
Keywords	Medicine ; R ; Science ; Q
Subject code	535
Language	English
Publishing date	2017-01-01T00:00:00Z
Publisher	Public Library of Science (PLoS)
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Localized surface plasmon resonance-based abscisic acid biosensor using aptamer-functionalized gold nanoparticles.

Shun Wang / Wei Li / Keke Chang / Juan Liu / Qingqian Guo / Haifeng Sun / Min Jiang / Hao Zhang / Jing Chen / Jiandong Hu

PLoS ONE, Vol 12, Iss 9, p e

2017 Volume 0185530

Abstract: Abscisic acid (ABA) plays an important role in abiotic stress response and physiological signal transduction resisting to the adverse environment. Therefore, it is very essential for the quantitative detection of abscisic acid (ABA) due to its ... ...

Abstract	Abscisic acid (ABA) plays an important role in abiotic stress response and physiological signal transduction resisting to the adverse environment. Therefore, it is very essential for the quantitative detection of abscisic acid (ABA) due to its indispensable role in plant physiological activities. Herein, a new detection method based on localized surface plasmon resonance (LSPR) using aptamer-functionalized gold nanoparticles (AuNPs) is developed without using expensive instrument and antibody. In the presence of ABA, ABA specifically bind with their aptamers to form the ABA-aptamer complexes with G-quadruplex-like structure and lose the ability to stabilize AuNPs against NaCl-induced aggregation. Meanwhile, the changes of the LSPR spectra of AuNP solution occur and therefore the detection of ABA achieved. Under optimized conditions, this method showed a good linear range covering from 5×10-7 M to 5×10-5 M with a detection limit of 0.33 μM. In practice, the usage of this novel method has been demonstrated by its application to detect ABA from fresh leaves of rice with the relative error of 6.59%-7.93% compared with ELISA bioassay. The experimental results confirmed that this LSPR-based biosensor is simple, selective and sensitive for the detection of ABA. The proposed LSPR method could offer a new analytical platform for the detection of other plant hormones by changing the corresponding aptamer.
Keywords	Medicine ; R ; Science ; Q
Subject code	540
Language	English
Publishing date	2017-01-01T00:00:00Z
Publisher	Public Library of Science (PLoS)
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: The Development of a Portable SPR Bioanalyzer for Sensitive Detection of Escherichia coli O157:H7

Shun Wang / Jiufeng Xie / Min Jiang / Keke Chang / Ruipeng Chen / Liuzheng Ma / Juanhua Zhu / Qingqian Guo / Haifeng Sun / Jiandong Hu

Sensors, Vol 16, Iss 11, p

2016 Volume 1856

Abstract: The purpose of this study was to develop a portable surface plasmon resonance (SPR) bioanalyzer for the sensitive detection of Escherichia coli O157:H7 in comparison with an enzyme-linked immunosorbent assay (ELISA). The experimental setup mainly ... ...

Abstract	The purpose of this study was to develop a portable surface plasmon resonance (SPR) bioanalyzer for the sensitive detection of Escherichia coli O157:H7 in comparison with an enzyme-linked immunosorbent assay (ELISA). The experimental setup mainly consisted of an integrated biosensor and a homemade microfluidic cell with a three-way solenoid valve. In order to detect Escherichia coli O157:H7 using the SPR immunoassay, 3-mercaptopropionic acid (3-MPA) was chemisorbed onto a gold surface via covalent bond for the immobilization of biological species. 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride (EDC) and N-hydroxysuccinimide (NHS) were used as crosslinker reagents to enable the reaction between 3-MPA and Escherichia coli O157:H7 antibodies by covalent –CO–NH– amide bonding. The experimental results were obtained from the Escherichia coli O157:H7 positive samples prepared by 10-, 20-, 40-, 80-, and 160-fold dilution respectively, which show that a good linear relationship with the correlation coefficient R of 0.982 existed between the response units from the portable SPR bioanalyzer and the concentration of Escherichia coli O157:H7 positive samples. Moreover, the theoretical detection limit of 1.87 × 103 cfu/mL was calculated from the positive control samples. Compared with the Escherichia coli O157:H7 ELISA kit, the sensitivity of this portable SPR bioanalyzer is four orders of magnitude higher than the ELISA kit. The results demonstrate that the portable SPR bioanalyzer could provide an alternative method for the quantitative and sensitive determination of Escherichia coli O157:H7 in field.
Keywords	Escherichia coli O157:H7 ; portable surface plasmon resonance (SPR) bioanalyzer ; biomolecular recognition membrane ; ELISA kit ; response unit ; Technology (General) ; T1-995 ; Technology ; T ; Analytical chemistry ; QD71-142 ; Chemistry ; QD1-999 ; Science ; Q ; Chemical technology ; TP1-1185
Subject code	540
Language	English
Publishing date	2016-11-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Element Replacement Approach by Reaction with Lewis Acidic Molten Salts to Synthesize Nanolaminated MAX Phases and MXenes

Li, Mian / Jun Lu / Kan Luo / Youbing Li / Keke Chang / Ke Chen / Jie Zhou / Johanna Rosen / Lars Hultman / Per Eklund / Per O. Å. Persson / Shiyu Du / Zhifang Chai / Zhengren Huang / Qing Huang

Journal of the American Chemical Society. 2019 Mar. 01, v. 141, no. 11

2019

Abstract: Nanolaminated materials are important because of their exceptional properties and wide range of applications. Here, we demonstrate a general approach to synthesizing a series of Zn-based MAX phases and Cl-terminated MXenes originating from the ... ...

Abstract	Nanolaminated materials are important because of their exceptional properties and wide range of applications. Here, we demonstrate a general approach to synthesizing a series of Zn-based MAX phases and Cl-terminated MXenes originating from the replacement reaction between the MAX phase and the late transition-metal halides. The approach is a top-down route that enables the late transitional element atom (Zn in the present case) to occupy the A site in the pre-existing MAX phase structure. Using this replacement reaction between the Zn element from molten ZnCl₂ and the Al element in MAX phase precursors (Ti₃AlC₂, Ti₂AlC, Ti₂AlN, and V₂AlC), novel MAX phases Ti₃ZnC₂, Ti₂ZnC, Ti₂ZnN, and V₂ZnC were synthesized. When employing excess ZnCl₂, Cl-terminated MXenes (such as Ti₃C₂Cl₂ and Ti₂CCl₂) were derived by a subsequent exfoliation of Ti₃ZnC₂ and Ti₂ZnC due to the strong Lewis acidity of molten ZnCl₂. These results indicate that A-site element replacement in traditional MAX phases by late transition-metal halides opens the door to explore MAX phases that are not thermodynamically stable at high temperature and would be difficult to synthesize through the commonly employed powder metallurgy approach. In addition, this is the first time that exclusively Cl-terminated MXenes were obtained, and the etching effect of Lewis acid in molten salts provides a green and viable route to preparing MXenes through an HF-free chemical approach.
Keywords	Lewis acids ; acidity ; aluminum ; metallurgy ; temperature ; thermodynamics ; zinc ; zinc chloride
Language	English
Dates of publication	2019-0301
Size	p. 4730-4737.
Publishing place	American Chemical Society
Document type	Article
ZDB-ID	3155-0
ISSN	1520-5126 ; 0002-7863
ISSN (online)	1520-5126
ISSN	0002-7863
DOI	10.1021/jacs.9b00574
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: A Low Cost Compact Measurement System Constructed Using a Smart Electrochemical Sensor for the Real-Time Discrimination of Fruit Ripening

Liuzheng Ma / Ling Wang / Ruipeng Chen / Keke Chang / Shun Wang / Xinran Hu / Xiaohui Sun / Zhaohui Lu / Haifeng Sun / Qingqian Guo / Min Jiang / Jiandong Hu

Sensors, Vol 16, Iss 4, p

2016 Volume 501

Abstract: Ethylene as an indicator for evaluating fruit ripening can be measured by very sensitive electrochemical gas sensors based on a high-resolution current produced by a bias potential applied to the electrodes. For this purpose, a measurement system for ... ...

Abstract	Ethylene as an indicator for evaluating fruit ripening can be measured by very sensitive electrochemical gas sensors based on a high-resolution current produced by a bias potential applied to the electrodes. For this purpose, a measurement system for monitoring ethylene gas concentrations to evaluate fruit ripening by using the electrochemical ethylene sensor was successfully developed. Before the electrochemical ethylene sensor was used to measure the ethylene gas concentrations released from fruits, a calibration curve was established by the standard ethylene gases at concentrations of 2.99 ppm, 4.99 ppm, 8.01 ppm and 10 ppm, respectively, with a flow rate of 0.4 L·min−1. From the calibration curve, the linear relationship between the responses and concentrations of ethylene gas was obtained in the range of 0–10 ppm with the correlation coefficient R2 of 0.9976. The micropump and a novel signal conditioning circuit were implemented in this measurement, resulting in a rapid response in detecting ethylene concentrations down to 0.1 ppm in air and in under 50 s. In this experiment, three kinds of fruits—apples, pears and kiwifruits—were studied at a low concentration (under 0.8 ppm) of trace ethylene content in the air exhaled by fruits. The experimental results showed that a low cost, compact measurement system constructed by using an electrochemical ethylene sensor has a high sensitivity of 0.3907 V·ppm−1 with a theoretical detection limit of 0.413 ppm, and is non-invasive and highly portable.
Keywords	ethylene gas ; micropump ; electrochemical sensor ; fruit ripening ; non-invasive ; Technology (General) ; T1-995 ; Technology ; T ; Analytical chemistry ; QD71-142 ; Chemistry ; QD1-999 ; Science ; Q
Subject code	621
Language	English
Publishing date	2016-04-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Considerations on Circuit Design and Data Acquisition of a Portable Surface Plasmon Resonance Biosensing System

Keke Chang / Ruipeng Chen / Shun Wang / Jianwei Li / Xinran Hu / Hao Liang / Baiqiong Cao / Xiaohui Sun / Liuzheng Ma / Juanhua Zhu / Min Jiang / Jiandong Hu

Sensors, Vol 15, Iss 8, Pp 20511-

2015 Volume 20523

Abstract: The aim of this study was to develop a circuit for an inexpensive portable biosensing system based on surface plasmon resonance spectroscopy. This portable biosensing system designed for field use is characterized by a special structure which consists of ...

Abstract	The aim of this study was to develop a circuit for an inexpensive portable biosensing system based on surface plasmon resonance spectroscopy. This portable biosensing system designed for field use is characterized by a special structure which consists of a microfluidic cell incorporating a right angle prism functionalized with a biomolecular identification membrane, a laser line generator and a data acquisition circuit board. The data structure, data memory capacity and a line charge-coupled device (CCD) array with a driving circuit for collecting the photoelectric signals are intensively focused on and the high performance analog-to-digital (A/D) converter is comprehensively evaluated. The interface circuit and the photoelectric signal amplifier circuit are first studied to obtain the weak signals from the line CCD array in this experiment. Quantitative measurements for validating the sensitivity of the biosensing system were implemented using ethanol solutions of various concentrations indicated by volume fractions of 5%, 8%, 15%, 20%, 25%, and 30%, respectively, without a biomembrane immobilized on the surface of the SPR sensor. The experiments demonstrated that it is possible to detect a change in the refractive index of an ethanol solution with a sensitivity of 4.99838 × 105 ΔRU/RI in terms of the changes in delta response unit with refractive index using this SPR biosensing system, whereby the theoretical limit of detection of 3.3537 × 10−5 refractive index unit (RIU) and a high linearity at the correlation coefficient of 0.98065. The results obtained from a series of tests confirmed the practicality of this cost-effective portable SPR biosensing system.
Keywords	surface plasmon resonance ; biosensing system ; linear CCD array ; microcontroller ; ADC conversion time ; refractive index ; Technology (General) ; T1-995 ; Technology ; T ; Analytical chemistry ; QD71-142 ; Chemistry ; QD1-999 ; Science ; Q
Subject code	535
Language	English
Publishing date	2015-08-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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