The structure–property relationship in LAPONITE® materials: from Wigner glasses to strong self-healing hydrogels formed by non-covalent interactions

Soft Matter ◽  
2019 ◽  
Vol 15 (6) ◽  
pp. 1278-1289 ◽  
Author(s):  
Tiago B. Becher ◽  
Carolyne B. Braga ◽  
Diego L. Bertuzzi ◽  
Miguel D. Ramos ◽  
Ayaz Hassan ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Self Healing ◽  
Structure Property ◽  
Potential Measurement ◽  
Absorbance Spectroscopy ◽  
Structure Property Relationship ◽  
Non Covalent Interactions ◽  
Covalent Interactions ◽  
Scanning Electron

Rheology, SAXS, and dynamic light scattering (DLS) analysis, zeta potential measurement, scanning electron microscopy (SEM), and micro-FTIR and absorbance spectroscopy were used to enlighten the controversial literature about LAPONITE® materials.

scholarly journals Preparation, Characterization, and Photocatalytic Properties of Modified Red Mud

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Mingjie Ma ◽  
Guanyu Wang ◽  
Zhengpeng Yang ◽  
Shanxiu Huang ◽  
Weijie Guo ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Scanning Electron Microscopy ◽  
Uv Irradiation ◽  
Red Mud ◽  
Structure Property ◽  
X Ray Diffraction ◽  
X Ray ◽  
Xrf Scanning ◽  
Scanning Electron

Solid waste red mud was modified by HCl leaching. The structure property and composition of modified red mud were investigated by X-ray diffraction (XRD), X-ray fluorescence spectroscopy (XRF), scanning electron microscopy (SEM), and Brunauer-Emmett-Teller (BET). Under UV irradiation, methyl orange (MO) aqueous solution was photodegraded by modified red mud. The obtained results showed that the specific surface area of modified red mud was 317.14 m2/g, which was about 40 times higher than that of the normal red mud. After UV irradiation for 50 min, the removal percentage of MO reached 94.2%. The study provided a novel way for the application of red mud to the photocatalytic degradation of organic wastes.

scholarly journals Extensive Analysis of Structure-Property Relationships in Thin-Film Solar Cells Using Scanning Electron Microscopy in Combination with Focused Ion Beam

2013 ◽  
Vol 19 (S2) ◽  
pp. 1096-1097
Author(s):  
D. Abou-Ras ◽  
K. Tsyrulin ◽  
N. Schäfer ◽  
M. Nichterwitz ◽  
H. Kropf ◽  
...  
Keyword(s):  
Thin Film ◽  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Thin Film Solar Cells ◽  
Structure Property ◽  
Structure Property Relationships ◽  
Extensive Analysis ◽  
Scanning Electron

Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – August 8, 2013.

scholarly journals Scanning electron microscopy of the collodion membrane from a self-healing collodion baby

2015 ◽  
Vol 90 (4) ◽  
pp. 581-584 ◽  
Author(s):  
Hiram Larangeira de Almeida Jr. ◽  
Henrique Isaacsson ◽  
Isabelle Maffei Guarenti ◽  
Ricardo Marques e Silva ◽  
Luis Antônio Suita de Castro
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Self Healing ◽  
Collodion Baby ◽  
Scanning Electron

scholarly journals Bioimmobilized Limestone Powder for Autonomous Healing of Cementitious Systems: A Feasibility Study

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Nafeesa Shaheen ◽  
Rao Arsalan Khushnood ◽  
Siraj Ud din
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Limestone Powder ◽  
Cement Matrix ◽  
Self Healing ◽  
Calcite Precipitation ◽  
X Ray ◽  
Cementitious Systems ◽  
Scanning Electron

For preserving concrete structures and hindering ingress of chemicals through cracks and fissures, repair is inevitable. Microbial calcite precipitation is an intrinsic approach for crack rectification and emulating way of sustainability for reducing anthropogenic greenhouse gases (GHGs) along with conserving the natural resources. In this study,Bacillus subtilisstrain is applied for intrinsic repair of concrete’s cracks because of its high pH endurance and capability of sporulation. For prolonged survival of microorganisms, immobilization technique was employed.B. subtiliswas immobilized through limestone powder (LSP) before adding into cement matrix. Self-healing proficiency ofB. subtiliswas deliberated in terms of mechanical strength regain after cracking at 3, 7, 14, and 28 days. To examine the microstructure and characterization of healing precipitate, micrographical (field emission scanning electron microscopy), chemical (energy dispersive X-ray), and thermal (thermogravimetric analysis) analyses were performed after the healing period of 28 days. The results revealed evident signs of calcite precipitation in nano-/microcracks subsequent to microbial activity. Furthermore, immobilized LSP improved the compressive strength of the analyzed formulations.

Synthesis of self-healing polyurethane and its application in graphene/SnO2-pillared carbon anode materials

2019 ◽  
Vol 28 (5) ◽  
pp. 348-355
Author(s):  
Young Joon Kwon ◽  
Jeevan Kumar Reddy Modigunta ◽  
AM Shanmugharaj ◽  
Hyung Jin Mun ◽  
Sung Hun Ryu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Electrochemical Performance ◽  
Anode Materials ◽  
Electrochemical Impedance ◽  
Reversible Capacity ◽  
Carbon Anode ◽  
Self Healing ◽  
Oxide Electrodes ◽  
Scanning Electron

Self-healing polyurethane (SHPU) containing disulfide was synthesized and used as a binder to investigate its effect on the performance of reduced graphene oxide–tin oxide electrodes compared to those of polyurethane (PU) and poly(vinylidene difluoride) (PVDF) binders in Li-ion battery (LIB). Structural and morphological characterization of the SHPU and electrode was performed using a tensile tester, Fourier transform infrared spectroscopy, X-ray diffractometer, and scanning electron microscopy. Electrochemical performance was investigated using Galvanostatic charge–discharge and electrochemical impedance measurements. The tensile properties and scanning electron microscopy photographs confirmed the self-healing characteristics of the synthesized SHPU. Electrochemical studies were conducted using an RGO-SnO2 electrode. The electrochemical measurements revealed that the SnO2-pillared carbon-based anode materials with SHPU binder showed improved cycling performances with an excellent reversible capacity retention compared to PU or PVDF. After 1000 cycles at 1C, the surface morphology of the electrode with SHPU showed no cracks or dendrites, while the PVDF-based electrode possessed some cracks and dendrites on its surface. The electrochemical results confirmed that SHPU binder improves the electrochemical performance of LIBs.

scholarly journals Towards electrically conductive, self-healing materials

2007 ◽  
Vol 4 (13) ◽  
pp. 359-362 ◽  
Author(s):  
Kyle A Williams ◽  
Andrew J Boydston ◽  
Christopher W Bielawski
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Scanning Electron Microscopy ◽  
Solid State ◽  
Thermal Treatment ◽  
Heterocyclic Carbenes ◽  
Organometallic Polymers ◽  
Self Healing ◽  
Electrically Conductive ◽  
Scanning Electron

A novel class of organometallic polymers comprising N -heterocyclic carbenes and transition metals was shown to have potential as an electrically conductive, self-healing material. These polymers were found to exhibit conductivities of the order of 10 −3  S cm −1 and showed structurally dynamic characteristics in the solid-state. Thin films of these materials were cast onto silicon wafers, then scored and imaged using a scanning electron microscopy (SEM). The scored films were subsequently healed via thermal treatment, which enabled the material to flow via a unique depolymerization process, as determined by SEM and surface profilometry. A method for incorporating these features into a device that exhibits electrically driven, self-healing functions is proposed.

Pathogenesis of Human Hair Defects

1974 ◽  
Vol 32 ◽  
pp. 12-13
Author(s):  
P.S. Porter ◽  
T. Aoyagi ◽  
R. Matta
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Human Hair ◽  
Standard Techniques ◽  
Scanning Electron

Using standard techniques of scanning electron microscopy (SEM), over 1000 human hair defects have been studied. In several of the defects, the pathogenesis of the abnormality has been clarified using these techniques. It is the purpose of this paper to present several distinct morphologic abnormalities of hair and to discuss their pathogenesis as elucidated through techniques of scanning electron microscopy.

Ultrastructural Analysis of the Salivary Glands of Gromphadorhina Portentosa (Schaum)

1977 ◽  
Vol 35 ◽  
pp. 638-639
Author(s):  
P.J. Dailey
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Salivary Glands ◽  
Secretory Vesicles ◽  
The Past ◽  
Transmission Electron ◽  
Means Of Transmission ◽  
Gromphadorhina Portentosa ◽  
Scanning Electron ◽  
Topographical Relief

The structure of insect salivary glands has been extensively investigated during the past decade; however, none have attempted scanning electron microscopy (SEM) in ultrastructural examinations of these secretory organs. This study correlates fine structure by means of SEM cryofractography with that of thin-sectioned epoxy embedded material observed by means of transmission electron microscopy (TEM).Salivary glands of Gromphadorhina portentosa were excised and immediately submerged in cold (4°C) paraformaldehyde-glutaraldehyde fixative1 for 2 hr, washed and post-fixed in 1 per cent 0s04 in phosphosphate buffer (4°C for 2 hr). After ethanolic dehydration half of the samples were embedded in Epon 812 for TEM and half cryofractured and subsequently critical point dried for SEM. Dried specimens were mounted on aluminum stubs and coated with approximately 150 Å of gold in a cold sputtering apparatus.Figure 1 shows a cryofractured plane through a salivary acinus revealing topographical relief of secretory vesicles.

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