Effect of Kaolin Particle Size Towards Preparation of Kaolin Ceramic Membrane

2021 ◽  
Vol 02 (01) ◽  
Author(s):  
Siti Khadijah Hubadillah ◽  
◽  
Norsiah Hami ◽  
Nurul Azita Salleh ◽  
Mohd Riduan Jamalludin ◽  
...  
Keyword(s):  
Particle Size ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Field Emission ◽  
Preliminary Data ◽  
Membrane Structure ◽  
Ceramic Membrane ◽  
Low Cost ◽  
Dense Structure ◽  
Scanning Electron

The purpose of this work is to study the effect of kaolin particle size for the preparation of low cost ceramic membrane suspension and ceramic membrane structure. Kaolin particle size is categorized into two categories; i) ≤ 1µm and ii) ≥ 1 µm. The suspension is prepared via stirring technique under 1000 rpm at 60°C. The particle size of kaolin is characterized using field emission scanning electron microscope (FESEM) and the prepared suspension is characterized in term of its viscosity. Results indicate that the particle size gave significant effect to the viscosity of ceramic membrane suspension. Preliminary data showed that kaolin with particle size ≤ 1µm resulted ceramic membrane with dense structure.

Effect of Mo2C Content on Microstructure and Composition of Ti(C,N)-Based Cermets Mixing in Water

2011 ◽  
Vol 284-286 ◽  
pp. 314-317
Author(s):  
Ping Feng ◽  
Xiao Ming Zhang ◽  
Song Jin ◽  
Teng Biao Zheng
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Field Emission ◽  
Volume Fraction ◽  
Energy Dispersive Spectrometer ◽  
Raw Material ◽  
Binder Phase ◽  
Scanning Electron

Element Mo plays a significant role in Ti(C,N)-based cermets. In this work, mixing was carried out in water and cermets with high mechanical properties were fabricated. The effect of Mo2C content on microstructure and composition was investigated by field emission scanning electron microscope (FSEM) and energy dispersive spectrometer (EDS). Results showed that microstructure becomes uniformly distributed, binder distribution becomes symmetrical and the particle size becomes small with increase of Mo2C content. The volume fraction of (outer + inner) rim structure increases, the volume fractions of core structure and binder phase decrease instead. It was found that Mo2C content in raw material affects compositions in phases. With the level of Mo2C content rising, the concentration of element Mo in rim structure increases, the concentration of element Ti in binder decreases.

Field Emission SEM Equipped With Noise Compensator

1973 ◽  
Vol 31 ◽  
pp. 302-303
Author(s):  
S. Saito ◽  
H. Todokoro ◽  
S. Nomura ◽  
T. Komoda
Keyword(s):  
Electron Microscope ◽  
High Resolution ◽  
Scanning Electron Microscope ◽  
Field Emission ◽  
Low Contrast ◽  
Probe Current ◽  
High Resolution Images ◽  
Scanning Electron

Field emission scanning electron microscope (FESEM) features extremely high resolution images, and offers many valuable information. But, for a specimen which gives low contrast images, lateral stripes appear in images. These stripes are resulted from signal fluctuations caused by probe current noises. In order to obtain good images without stripes, the fluctuations should be less than 1%, especially for low contrast images. For this purpose, the authors realized a noise compensator, and applied this to the FESEM.Fig. 1 shows an outline of FESEM equipped with a noise compensator. Two apertures are provided gust under the field emission gun.

Comparison of freeze-fractured yeast replicas using conventional TEM and low-voltage field-emission SEM

1989 ◽  
Vol 47 ◽  
pp. 74-75
Author(s):  
William P. Wergin ◽  
Eric F. Erbe ◽  
Terrence W. Reilly
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Field Emission ◽  
Low Voltage ◽  
Objective Lens ◽  
Specimen Preparation ◽  
Lens System ◽  
Air Drying ◽  
Preparation Techniques ◽  
Scanning Electron

Although the first commercial scanning electron microscope (SEM) was introduced in 1965, the limited resolution and the lack of preparation techniques initially confined biological observations to relatively low magnification images showing anatomical surface features of samples that withstood the artifacts associated with air drying. As the design of instrumentation improved and the techniques for specimen preparation developed, the SEM allowed biologists to gain additional insights not only on the external features of samples but on the internal structure of tissues as well. By 1985, the resolution of the conventional SEM had reached 3 - 5 nm; however most biological samples still required a conductive coating of 20 - 30 nm that prevented investigators from approaching the level of information that was available with various TEM techniques. Recently, a new SEM design combined a condenser-objective lens system with a field emission electron source.

scholarly journals A secondary stage design for the preparation of microfossils for the SEM

1993 ◽  
Vol 12 (2) ◽  
pp. 154-154
Author(s):  
Stephen Tatman
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Low Cost ◽  
Sample Tube ◽  
Stage Design ◽  
Single Carrier ◽  
Secondary Stage ◽  
Scanning Electron ◽  
Made In

Abstract. The preparation of microfossil specimens for study with the scanning electron microscope involves the transfer of material from slides to stubs. Specimens must then be oriented and mounted securely. To do this accurately the slide and stub should both be viewed through a stereomicroscope. However due to differences in shape and height, both surfaces are not usually in the plane of focus at the same time. Many micropalaeontologists routinely use small boxes or sample tube lids to hold the stub and refocus before finally mounting the specimens. The risk of dropping specimens is reduced by using a single carrier, securely holding both the slide and stub. The design illustrated below (fig.1) was developed from a prototype constructed from cardboard and plastic. The metal unit can easily be made in a workshop at a very low cost or cardboard versions made in the laboratory.The stage is based on the principle that both slide and stub should be held securely, close together and in the same plane of focus. The slide holders should be secure but not too tight otherwise the stub may be jarred as slides are changed. The number of slides which can be held on one unit may be varied. The presence of two holders has proved useful, any more could make the unit cumbersome. If the microscope to be used does not have a wide stage then it may prove more practical to have only one holder.The stub holders allow the stub to be clamped to . . .

scholarly journals سنتز و بهینه‌سازی حاملهای نیوزومی حاوی داروی دوکسوروبیسین به منظور دستیابی به فرمولاسیون نهایی با پتانسیل بالا در دما و اسیدیته سلول‌های سرطانی

2019 ◽  
Author(s):  
هاشم شاهی مالمیر ◽  
سیدمهدی کلانتر ◽  
الهام ساسانی ◽  
مرتضی اسگری ◽  
محمد مجدی زاده ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Field Emission ◽  
Scanning Electron ◽  
Poly Dispersity Index

مقدمه: دوکسوروبیسین، از متداول ترین داروهای مورد استفاده در شیمی‌درمانی سرطان با عوارض جانبی بسیار همراه بوده و این حقیقت استفاده از آن را با محدودیت هایی مواجه می سازد. در مطالعه حاضر با تکیه بر دانش نانوحامل های دارویی، فرمولاسیون‌های متعددی از فرم نیوزومه‌ شده این دارو سنتز شده و بهینه‌سازی های سطحی در خصوص فرمولاسیون منتخب نهایی اعمال گردید. روش بررسی: پژوهش حاضر یک مطالعه تجربی است. سامانه های نیوزومی با فرمولاسیون‌های متعدد و استفاده از توئین-60 و کلسترول به روش هیدراتاسیون فیلم نازک سنتز شدند. داروی دوکسوروبیسین به طور غیرفعال درون نیوزوم ها بارگذاری شد.  سپس بهینه سازی ها بر اساس انتخاب تجربی دو فرمول از 6 فرمول ساخته شده، و بررسی اثر افزودن تویین20، پلیمر DSPE-mPEG (2000) و فسفولیپید کاتیونی DOTAP (به ترتیب) صورت پذیرفت. سپس شاخصه های فیزیکوشیمیایی نانوسامانه از منظر بازده درون‌گیری، پروفایل رهایش دارو در شرایط مشابه سلول‌های سالم و سرطانی، قطر هیدرودینامیک،Poly Dispersity Index ، پتانسیل زتا، مورفولوژی و طیف Infrared Spectroscopy (IR) تعیین گردید. به منظور رسم گراف ها و بیان داده ها به ترتیب از نرم افزارهای Origin و Excel استفاده شد. نتایج: فرمول نیوزوم بهینه شده نهایی نیوزومی دارای قطر nm59/92، انکپسولاسیون 43/0 ± 8/91%، پتانسیل زتا mV5/3- و شاخص پراکندگی 196/0 می باشد. حداکثر رهایش دارو از نانوسامانه  تحت شرایط سلول‌های سالم و سرطانی (C° 37، 4/7=pH و C° 42، 4/5=pH) بعد از گذشت 48 ساعت، به ترتیب؛ 3/62% و 5/76% بوده است. بررسی های Field Emission Scanning Electron Microscope و IR نشان از مورفولوژی کروی و عدم وجود برهم کنش شیمیایی میان نانوسامانه و دارو بوده است. نتیجه‌گیری: نتایج این مطالعه نیمه ‌هدفمند ‌بودن این حامل دارویی را اثبات می کند. هم چنین نشان می هد، نیوزوم  بدون ایجاد تغییر در ماهیت شیمیایی دارو و با تخصصی نمودن دارو‌رسانی، اثربخشی و کیفیت‌زندگی بیمار را افزایش و عوارض جانبی را کاهش می دهد.

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