Oligochitosan‐modified three‐dimensional graphene free‐standing electrode for electrochemical detection of imidacloprid insecticide

2019 ◽  
Vol 67 (6) ◽  
pp. 1078-1088
Author(s):  
Xingchen Zhai ◽  
Min Zhang ◽  
Pan Chen ◽  
Thanawat Siriphithakyothin ◽  
Jingyi Liu ◽  
...  
Keyword(s):  
Electrochemical Detection ◽  
Three Dimensional ◽  
Free Standing

scholarly journals Facile Pretreatment of Three-Dimensional Graphene through Electrochemical Polarization for Improved Electrocatalytic Performance and Simultaneous Electrochemical Detection of Catechol and Hydroquinone

Nanomaterials ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 65
Author(s):  
Huaxu Zhou ◽  
Guotao Dong ◽  
Ajabkhan Sailjoi ◽  
Jiyang Liu
Keyword(s):  
Electrochemical Detection ◽  
Low Cost ◽  
Three Dimensional ◽  
Chemical Vapor ◽  
High Potential ◽  
Mixed Solution ◽  
Electrochemical Polarization ◽  
Macroporous Structure ◽  
Free Standing ◽  
Selective Determination

Three-dimensional graphene (3DG) with macroporous structure has great potential in the field of electroanalysis owing to a large active area, excellent electron mobility and good mass transfer. However, simple and low-cost preparation of 3DG electrodes with high electrocatalytic ability is still a challenge. Here, a fast and convenient electrochemical polarization method is established to pretreat free-standing 3DG (p-3DG) to offer high electrocatalytic ability. 3DG with monolithic and macroporous structure prepared by chemical vapor deposition (CVD) is applied as the starting electrode. Electrochemical polarization is performed using electrochemical oxidation (anodization) at high potential (+6 V) followed with electrochemical reduction (cathodization) at low potential (−1 V), leading to exposure of edge of graphene and introduction of oxygen-containing groups. The as-prepared p-3DG displays increased hydrophilicity and improved electrocatalytic ability. As a proof of concept, p-3DG was used to selective electrochemical detection of two isomers of benzenediol, hydroquinone (p-BD) and catechol (o-BD). In comparison with initial 3DG, p-3DG exhibits increased reversibility of redox reaction, improved peak current and good potential resolution with high potential separation between p-BD and o-BD. Individual or selective determination of p-BD or o-BD in single substance solution or binary mixed solution is realized. Real analysis of pond water is also achieved.

N-Doped Carbon-Wrapped Cobalt–Manganese Oxide Nanosheets Loaded into a Three-Dimensional Graphene Nanonetwork as a Free-Standing Anode for Lithium-Ion Storage

2021 ◽  
Vol 4 (4) ◽  
pp. 3619-3630
Author(s):  
Peilin Zhang ◽  
Weiwei Wang ◽  
Jinzhe Liu ◽  
Chencheng Zhou ◽  
Jiao-Jiao Zhou ◽  
...  
Keyword(s):  
Manganese Oxide ◽  
Three Dimensional ◽  
Lithium Ion ◽  
Free Standing ◽  
Ion Storage

Free-standing graphene-based porous carbon films with three-dimensional hierarchical architecture for advanced flexible Li–sulfur batteries

2015 ◽  
Vol 3 (18) ◽  
pp. 9438-9445 ◽  
Author(s):  
Chao Wu ◽  
Lijun Fu ◽  
Joachim Maier ◽  
Yan Yu
Keyword(s):  
Porous Carbon ◽  
Three Dimensional ◽  
Carbon Films ◽  
Hierarchical Architecture ◽  
Free Standing ◽  
Hierarchically Porous

A novel free-standing cathode film consisting of hierarchically porous carbon-encapsulated sulfur has been designed and fabricated for Li–sulfur batteries.

Lengths and topology of alveolar septal borders

1989 ◽  
Vol 67 (5) ◽  
pp. 1930-1940 ◽  
Author(s):  
E. H. Oldmixon ◽  
J. P. Butler ◽  
F. G. Hoppin
Keyword(s):  
Connective Tissue ◽  
Three Dimensional ◽  
Free Standing ◽  
And Topology ◽  
Section Area ◽  
Dimensional Reconstruction ◽  
Alveolar Duct ◽  
Mechanical Linkage ◽  
Alveolar Septa ◽  
Alveolar Parenchyma

To clarify the mechanics of alveolar parenchyma, we undertook a stereological and topological study in perfusion-fixed canine lungs of the borders of alveolar septa. We defined the principal borders as those along which one septum 1) joins two others (J), 2) joins one other at a distinct angle (B), or 3) joins no other structure (E). E and B borders are invariably reinforced with heavy connective tissue cables; J borders are not. Relative net lengths, determined from the number of traces per section area, were J, 45%; E, 19%; and B, 25%. These were remarkably constant over 10 canine lobes (5 animals, 4 volumes). Parenchyma, then, departs from the simple models that comprise only Js and Es. Bs are important; their net length exceeds that of Es. With lobe deflation, E shortened somewhat more than required to maintain geometric similarity, suggesting that the alveolar duct contracted disproportionately. A three-dimensional reconstruction was made from serial sections, and individual border segments were followed through the reconstruction. Typical lengths of individual J, B, and E borders were nearly equal. To characterize how the network of borders were interconnected, we counted the nodes at which they meet by class, e.g., EBE for the meeting of one B, two Es. The most common are JJJJ, 26%; EEEJ, 10%; EBJ, 24%; EBE, 8%; BBJJ, 12%. If parenchyma were constructed only from free-standing entrance rings and septal junctions, only JJJJ and EEEJ would be anticipated. The presence of EBJ, EBE, and BBJJ underscores parenchymal complexity. Only 7% of septa examined were bordered entirely by Js. Connective tissue cables were not confined to the alveolar duct's lumen but often extended to the primary septa at the periphery of the ductal unit. They rarely linked adjacent alveolar ducts; only 1 in 200 cable segments crossed from one duct to another. These observations support the concept that the parenchyma is an elastic network, characterized in part by a serial mechanical linkage from connective tissue cable to septal membrane to cable again.

Flexible Three-Dimensional Heterostructured ZnO-Co3O4 on Carbon Cloth as Free-Standing Anode with Outstanding Li/Na Storage Performance

2018 ◽  
Vol 165 (16) ◽  
pp. A3932-A3942 ◽  
Author(s):  
Huanhui Chen ◽  
Libo Deng ◽  
Shan Luo ◽  
Xiangzhong Ren ◽  
Yongliang Li ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Carbon Cloth ◽  
Free Standing ◽  
Storage Performance

scholarly journals Linen Boxes and Slices: Raoul De Keyser and American Modernism in Belgium in the 1960s and 1970s

Arts ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 80
Author(s):  
Steven Jacobs
Keyword(s):  
Three Dimensional ◽  
Pop Art ◽  
Free Standing ◽  
American Modernism ◽  
Hard Edge ◽  
Three Dimensional Objects ◽  
Color Field Painting ◽  
New Vision ◽  
1960S And 1970S ◽  
The 1960S

Before his international breakthrough shortly before the turn of the century, Belgian painter Raoul De Keyser (1930–2012) had a long career that reaches back to the 1960s, when he was associated with Roger Raveel and the so-called Nieuwe Visie (New Vision in Dutch), Belgium’s variation on postwar figurative painting that also entails Anglo-Saxon Pop Art and French nouveau réalisme. Dealing with De Keyser’s works of the 1960s and 1970s, this article discusses the reception of American late-modernist art currents such as Color-Field Painting, Hard Edge, Pop Art, and Minimal Art in Belgium. Drawing on contemporaneous reflections (by, among others, poet and critic Roland Jooris) as well as on recently resurfaced materials from the artist’s personal archives, this essay focuses on the ways innovations associated with these American trends were appropriated by De Keyser, particularly in the production of his so-called Linen Boxes and Slices. Made between 1967 and 1971, Linen Boxes and Slices are paintings that evolved into three-dimensional objects, free-standing on the floor or leaning against the wall. Apart from situating these constructions in De Keyser’s oeuvre, this article interprets Linen Boxes and Slices as particular variations on Pop Art’s fascination for consumer items and on Minimalism’s interest in the spatial and material aspects of “specific objects”.

scholarly journals On-Chip Fabrication and In-Flow 3D-Printing of Cell-Laden Microgel Constructs: From Chip to Scaffold Materials in One Integral Process

2021 ◽  
Author(s):  
Stephan Förster ◽  
Jürgen Groll ◽  
Benjamin Reineke ◽  
Stephan Hauschild ◽  
Ilona Paulus ◽  
...  
Keyword(s):  
3D Printing ◽  
Three Dimensional ◽  
Cross Linking ◽  
Cell Protection ◽  
Free Standing ◽  
Produce Cell ◽  
Chip Fabrication ◽  
Integral Process ◽  
Scaffold Materials ◽  
On Chip

Bioprinting has evolved into a thriving technology for the fabrication of cell-laden scaffolds. Bioinks are the most critical component for bioprinting. Recently, microgels have been introduced as a very promising bioink enabling cell protection and the control of the cellular microenvironment. However, their microfluidic fabrication inherently seemed to be a limitation. Here we introduce a direct coupling of microfluidics and 3D-printing for the microfluidic production of cell-laden microgels with direct in-flow bioprinting into stable scaffolds. The methodology enables the continuous on-chip encapsulation of cells into monodisperse microdroplets with subsequent in-flow cross-linking to produce cell-laden microgels, which after exiting a microtubing are automatically jammed into thin continuous microgel filaments. The integration into a 3D printhead allows direct in-flow printing of the filaments into free-standing three-dimensional scaffolds. The method is demonstrated for different cross-linking methods and cell lines. With this advancement, microfluidics is no longer a bottleneck for biofabrication. <br>

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