Precise control of versatile microstructure and properties of graphene aerogel via freezing manipulation

Nanoscale ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 4882-4894 ◽  
Author(s):  
Xiangyu Zhu ◽  
Chao Yang ◽  
Pingwei Wu ◽  
Zhenqian Ma ◽  
Yuanyuan Shang ◽  
...  
Keyword(s):  
Pore Structure ◽  
Deep Understanding ◽  
Graphene Aerogel ◽  
Precise Control ◽  
Microstructure And Properties ◽  
Shaping Technique

A deep understanding of the shaping technique is urgently required to precisely tailor the pore structure of a graphene aerogel (GA) in order to fit versatile application backgrounds.

Synthesis and characterization of NaAlSi2O6 jadeite under high pressure from 4.0 GPa to 5.5 GPa

2016 ◽  
Vol 30 (10) ◽  
pp. 1650124 ◽  
Author(s):  
Fang Biao Wang ◽  
Gui Hong Zuo ◽  
Li Juan Wang ◽  
You Jin Zheng ◽  
Xiao Peng Jia ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Crystallization Temperature ◽  
Pressure Range ◽  
Deep Understanding ◽  
Experimental Results ◽  
Synthesis And Characterization ◽  
Microstructure And Properties

The method of high pressure and high temperature (HPHT) has been used for the synthesis of jadeite. Through this method, the NaAlSi2O6 jadeite can be obtained in the pressure range of 4.0–5.5 GPa. All the experimental results reveal that the microstructure and properties of synthetic jadeite resemble the natural jadeite very much. The research indicates that the crystallization temperature of the synthesized NaAlSi2O6 jadeite rises with the increase of the pressure, which will help in gaining a deep understanding on the origin of natural jadeite.

Precise control of agarose media pore structure by regulating cooling rate

2017 ◽  
Vol 40 (22) ◽  
pp. 4467-4474 ◽  
Author(s):  
Chao Chen ◽  
Xiunan Li ◽  
Dawei Zhao ◽  
Yaqiong Li ◽  
Hong Shi ◽  
...  
Keyword(s):  
Pore Structure ◽  
Cooling Rate ◽  
Precise Control

scholarly journals Precise Control of Pore Structure in Carbon by Template Technique

TANSO ◽  
2001 ◽  
Vol 2001 (199) ◽  
pp. 176-185 ◽  
Author(s):  
Takashi Kyotani
Keyword(s):  
Pore Structure ◽  
Precise Control

scholarly journals Recyclable 3D graphene aerogel with bimodal pore structure for ultrafast and selective oil sorption from water

RSC Advances ◽  
2017 ◽  
Vol 7 (47) ◽  
pp. 29722-29731 ◽  
Author(s):  
Muhammad Adil Riaz ◽  
Pejman Hadi ◽  
Irfan H. Abidi ◽  
Abhishek Tyagi ◽  
Xuewu Ou ◽  
...  
Keyword(s):  
Pore Structure ◽  
Sorption Rate ◽  
Uptake Capacity ◽  
Graphene Aerogel ◽  
3D Graphene ◽  
Oil Sorption ◽  
Porous Sorbent ◽  
Bimodal Pore Structure

Development of graphene based porous sorbent to overcome the challenges, such as low uptake capacity, slow sorption rate, and non-recyclability, associated with conventional sorbents.

A Novel Reconstitution Method for Inducing the Formation of Regular 2-Dimensional Arrays of Membrane Proteins and Lipids

1988 ◽  
Vol 46 ◽  
pp. 152-153 ◽  
Author(s):  
A. Engel ◽  
A. Holzenburg ◽  
K. Stauffer ◽  
J. Rosenbusch ◽  
U. Aebi
Keyword(s):  
Membrane Proteins ◽  
Flow Rate ◽  
Lipid Membranes ◽  
Functional Characterization ◽  
Dimensional Structure ◽  
Electron Crystallography ◽  
Peltier Element ◽  
Protein Ratio ◽  
Precise Control ◽  
3 Dimensional

Reconstitution of solubilized and purified membrane proteins in the presence of phospholipids into vesicles allows their functions to be studied by simple bulk measurements (e.g. diffusion of differently sized solutes) or by conductance measurements after transformation into planar membranes. On the other hand, reconstitution into regular protein-lipid arrays, usually forming at a specific lipid-to-protein ratio, provides the basis for determining the 3-dimensional structure of membrane proteins employing the tools of electron crystallography.To refine reconstitution conditions for reproducibly inducing formation of large and highly ordered protein-lipid membranes that are suitable for both electron crystallography and patch clamping experiments aimed at their functional characterization, we built a flow-dialysis device that allows precise control of temperature and flow-rate (Fig. 1). The flow rate is generated by a peristaltic pump and can be adjusted from 1 to 500 ml/h. The dialysis buffer is brought to a preselected temperature during its travel through a meandering path before it enters the dialysis reservoir. A Z-80 based computer controls a Peltier element allowing the temperature profile to be programmed as function of time.

Multiple-fracturing and viewing of the same frozen sample at different depths using a low temperature FESEM

1996 ◽  
Vol 54 ◽  
pp. 820-821
Author(s):  
M.V. Parthasarathy ◽  
C. Daugherty
Keyword(s):  
Temperature Field ◽  
Low Temperature ◽  
Field Emission ◽  
Multiple Fracture ◽  
Precise Control ◽  
Cold Stage ◽  
Different Depths ◽  
Transfer Device

The versatility of Low Temperature Field Emission SEM (LTFESEM) for viewing frozen-hydrated biological specimens, and the high resolutions that can be obtained with such instruments have been well documented. Studies done with LTFESEM have been usually limited to the viewing of small organisms, organs, cells, and organelles, or viewing such specimens after fracturing them.We use a Hitachi 4500 FESEM equipped with a recently developed BAL-TEC SCE 020 cryopreparation/transfer device for our LTFESEM studies. The SCE 020 is similar in design to the older SCU 020 except that instead of having a dedicated stage, the SCE 020 has a detachable cold stage that mounts on to the FESEM stage when needed. Since the SCE 020 has a precisely controlled lock manipulator for transferring the specimen table from the cryopreparation chamber to the cold stage in the FESEM, and also has a motor driven microtome for precise control of specimen fracture, we have explored the feasibility of using the LTFESEM for multiple-fracture studies of the same sample.

Correlation of Pore Structure and Permeability by SEM-Image Analysis

1990 ◽  
Vol 48 (1) ◽  
pp. 428-429
Author(s):  
C. A. Callender ◽  
Wm. C. Dawson ◽  
J. J. Funk
Keyword(s):  
Image Analysis ◽  
Pore Structure ◽  
Imaging System ◽  
Pore Space ◽  
Simulation Models ◽  
Image Analyzer ◽  
Imaging Data ◽  
Sem Images ◽  
Thin Sections ◽  
Rock Types

The geometric structure of pore space in some carbonate rocks can be correlated with petrophysical measurements by quantitatively analyzing binaries generated from SEM images. Reservoirs with similar porosities can have markedly different permeabilities. Image analysis identifies which characteristics of a rock are responsible for the permeability differences. Imaging data can explain unusual fluid flow patterns which, in turn, can improve production simulation models.Analytical SchemeOur sample suite consists of 30 Middle East carbonates having porosities ranging from 21 to 28% and permeabilities from 92 to 2153 md. Engineering tests reveal the lack of a consistent (predictable) relationship between porosity and permeability (Fig. 1). Finely polished thin sections were studied petrographically to determine rock texture. The studied thin sections represent four petrographically distinct carbonate rock types ranging from compacted, poorly-sorted, dolomitized, intraclastic grainstones to well-sorted, foraminiferal,ooid, peloidal grainstones. The samples were analyzed for pore structure by a Tracor Northern 5500 IPP 5B/80 image analyzer and a 80386 microprocessor-based imaging system. Between 30 and 50 SEM-generated backscattered electron images (frames) were collected per thin section. Binaries were created from the gray level that represents the pore space. Calculated values were averaged and the data analyzed to determine which geological pore structure characteristics actually affect permeability.

Cultural Competence Needed to Distinguish Disorder from Difference: Beyond Kumbaya

2015 ◽  
Vol 22 (2) ◽  
pp. 64-76 ◽  
Author(s):  
Catherine J. Crowley ◽  
Kristin Guest ◽  
Kenay Sudler
Keyword(s):  
New York ◽  
New York City ◽  
Public Schools ◽  
Cultural Competence ◽  
York City ◽  
Cultural Sensitivity ◽  
Graduate Program ◽  
Language Disorder ◽  
New York State ◽  
Deep Understanding

What does it mean to have true cultural competence as an speech-language pathologist (SLP)? In some areas of practice it may be enough to develop a perspective that values the expectations and identity of our clients and see them as partners in the therapeutic process. But when clinicians are asked to distinguish a language difference from a language disorder, cultural sensitivity is not enough. Rather, in these cases, cultural competence requires knowledge and skills in gathering data about a student's cultural and linguistic background and analyzing the student's language samples from that perspective. This article describes one American Speech-Language-Hearing Association (ASHA)-accredited graduate program in speech-language pathology and its approach to putting students on the path to becoming culturally competent SLPs, including challenges faced along the way. At Teachers College, Columbia University (TC) the program infuses knowledge of bilingualism and multiculturalism throughout the curriculum and offers bilingual students the opportunity to receive New York State certification as bilingual clinicians. Graduate students must demonstrate a deep understanding of the grammar of Standard American English and other varieties of English particularly those spoken in and around New York City. Two recent graduates of this graduate program contribute their perspectives on continuing to develop cultural competence while working with diverse students in New York City public schools.

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