Preparation of Carbon Nanotubes by Using Mesoporous Silica

2001 ◽  
Vol 675 ◽  
Author(s):  
Shinji Kawasaki ◽  
Shingo Komiyama ◽  
Shigekazu Ohmori ◽  
Akifumi Yao ◽  
Fujio Okino ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Mesoporous Silica ◽  
Pore Size ◽  
Present Method ◽  
Pore Sizes ◽  
Small Pore Size ◽  
Small Pore ◽  
Uniform Diameter ◽  
20 Nm

ABSTRACTCarbon nanotubes were synthesized using several mesoporous silica templates with different pore sizes in order to investigate the possibility of controlling the diameter of carbon nanotubes by changing the pore size of the mesoporous silica. TEM observation confirmed that carbon nanotubes with uniform diameter can be obtained by the present method. However, it was found that it is difficult to prepare carbon nanotubes having diameter smaller than ∼20 nm by the present method even if the template with small pore size is used.

Tailoring the Pore Size of Hypercrosslinked Polymer Foams

1996 ◽  
Vol 431 ◽  
Author(s):  
W. P. Steckle ◽  
M. A. Mitchell ◽  
P. G. Apen
Keyword(s):  
Pore Size ◽  
Polyaromatic Hydrocarbons ◽  
Crosslinking Agent ◽  
Nitrogen Adsorption ◽  
Total Surface Area ◽  
Pore Sizes ◽  
Surface Areas ◽  
Small Pore ◽  
High Resolution Tem ◽  
Cure Time

AbstractOrganic analogues to inorganic zeolites would be a significant step forward in engineered porous materials and would provide advantages in range, selectivity, tailorability and processing. Rigid molecular foams or “organic zeolites” would not be crystalline materials and could be tailored over a broader range of pore sizes and volumes. A novel process for preparing hypercrosslinked polymeric foams has been developed via a Friedel-Crafts polycondensation reaction. A series of rigid hypercrosslinked foams have been prepared using simple rigid polyaromatic hydrocarbons including benzene, biphenyl, m-terphenyl, diphenylmethane, and polystyrene, with p-dichloroxylene (DCX) or divinylbenzene (DVB) as the crosslinking agent. Transparent gels are formed suggesting a very small pore size. After drying the foams are robust and rigid. Densities of the resulting foams can range from 0.15g/cc to 0.75g/cc. Nitrogen adsorption studies have shown that by judiciously selecting monomers and crosslinking agent along with the level of crosslinking and the cure time of the resulting gel, the pore size, pore size distribution, and the total surface area of the foam can be tailored. Surface areas range from 160 to 1,200 m2/g with pore sizes ranging from 6Å to 2,000Å. Further evidence of the uniformity of the foams and their pore sizes has been confirmed by high resolution TEM.

ChemInform Abstract: C2-C4 OLEFINS BY REACTION OF METHANOL ON ZEOLITES OF SMALL PORE SIZE

1982 ◽  
Vol 13 (42) ◽  
Author(s):  
U. DETTMEIER ◽  
H. LITTERER ◽  
H. BALTES ◽  
W. HERZOG ◽  
E. I. LEUPOLD ◽  
...  
Keyword(s):  
Pore Size ◽  
Small Pore Size ◽  
Small Pore

Expanding Small Pore Size of the Bimodal Catalyst with Surfactant and Its Application in Slurry-phase Fischer-Tropsch Synthesis

2016 ◽  
Vol 1 (4) ◽  
pp. 778-783 ◽  
Author(s):  
Daisuke Ishihara ◽  
Jian Sun ◽  
Jie Li ◽  
Qinhong Wei ◽  
Noritatsu Tsubaki
Keyword(s):  
Pore Size ◽  
Tropsch Synthesis ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Small Pore Size ◽  
Slurry Phase ◽  
Small Pore

scholarly journals Effects of pore size on in vitro and in vivo anticancer efficacies of mesoporous silica nanoparticles

RSC Advances ◽  
2018 ◽  
Vol 8 (43) ◽  
pp. 24633-24640 ◽  
Author(s):  
Jie Li ◽  
Suqin Shen ◽  
Fei Kong ◽  
Ting Jiang ◽  
Cui Tang ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Pore Size ◽  
Silica Nanoparticles ◽  
Mesoporous Silica Nanoparticles ◽  
Pore Sizes

MSN with suitable pore sizes achieved an outstanding performance for in vitro and in vivo antitumor efficacies.

EVALUATION OF ANTI-AGING AND ANTI-ACNE EFFECT OF ANDALIMAN (ZANTHOXYLUM ACANTHOPODIUM DC.) ETHANOLIC EXTRACT PEEL OFF GEL MASK

2018 ◽  
Vol 11 (13) ◽  
pp. 90
Author(s):  
Ismanelly Hanum T ◽  
Lia Laila
Keyword(s):  
Polyvinyl Alcohol ◽  
Pore Size ◽  
Dosage Form ◽  
Black Spot ◽  
Ethanolic Extract ◽  
Distilled Water ◽  
Small Pore Size ◽  
Small Pore ◽  
Carbomer 940 ◽  
Skin Moisture

Objective: The study was conducted to evaluate the anti-aging and anti-acne effect of and aliman ethanolic extract (AEE) in the form of peel off gel mask (PGM) on human skin. Methods: The formulation of PGM base was consisted of polyvinyl alcohol, glycerine, methylparaben, propylparaben, Carbomer 940, and distilled water (blank). The AEE (30%) was formulated in the PGM base and labeled as F1. The anti-aging and anti-acne tests were conducted by comparing the blank and the F1. The evaluation of anti-aging activity was conducted using skin analyzer apparatus. The aging parameters were moisture, evenness, pore size, black spot, and wrinkle of the skin. The anti-acne evaluation was conducted on color, shape, volume, and number of acne. The data were collected for 4 weeks. Results: The anti-aging evaluation of andaliman PGM showed that the and AEE PGM could pretend the skin moisture, skin evenness, small pore size, and declined in number of black spot and wrinkle. The anti-acne evaluation showed the healing of acne after 4 weeks treatment. Conclusion: It is concluded that and AEE PGM can be used as an effective anti-aging and anti-acne dosage form.

A cobalt metal-organic framework with small pore size for adsorptive separation of CO2 over N2 and CH4

AIChE Journal ◽  
2017 ◽  
Vol 63 (10) ◽  
pp. 4532-4540 ◽  
Author(s):  
Bohan Shan ◽  
Jiuhao Yu ◽  
Mitchell R. Armstrong ◽  
Dingke Wang ◽  
Bin Mu ◽  
...  
Keyword(s):  
Pore Size ◽  
Metal Organic Framework ◽  
Cobalt Metal ◽  
Small Pore Size ◽  
Adsorptive Separation ◽  
Small Pore ◽  
Metal Organic ◽  
Separation Of Co2 ◽  
Organic Framework

The Study Based on LABVIEW of the Positioning Accuracy of Spinneret Microporous Fine Machine

2013 ◽  
Vol 712-715 ◽  
pp. 1347-1350
Author(s):  
Si Yu Liu ◽  
Pei Feng ◽  
Chong Chang Yang
Keyword(s):  
Pore Size ◽  
High Precision ◽  
Vital Role ◽  
Positioning System ◽  
Precision Positioning ◽  
Positioning Accuracy ◽  
Small Pore Size ◽  
Small Pore ◽  
Positioning Method

The microporous on spinneret has the characteristics of high precision, small pore size and large quantity. Spinneret microporous finishing operation is mainly used for removing the burr formed on the spinneret silk surface after micropores drilling and punching. The burrs seriously affect the quality of the spinning fibers. Micropore spinneret finishing plays a vital role in improving the quality of processing micropore. This paper introduces a system consisting of the spinneret micropore fine machine,then focuses on fine machine positioning system and proposes a high-precision positioning method of the microporous.

Effect of Blend Ratio on Morphology and Swelling Properties of PVA/Chitosan Nanofibers

2017 ◽  
Vol 901 ◽  
pp. 79-84 ◽  
Author(s):  
Nasikhudin ◽  
Intan Puspitasari ◽  
Markus Diantoro ◽  
Ahmad Kusumaatmaja ◽  
Kuwat Triyana
Keyword(s):  
Pore Size ◽  
Smooth Surface ◽  
Fiber Diameter ◽  
High Porosity ◽  
Swelling Properties ◽  
Blend Ratio ◽  
Small Pore Size ◽  
Small Pore ◽  
Electrospinning Method ◽  
Solution Increase

PVA/chitosan nanofibers have been prepared by electrospinning method. A novel nanofibers mat was prepared in a various blend ratio of PVA to chitosan. The structure of PVA/chitosan nanofibers was examined by FTIR and SEM. The results showed that PVA/chitosan nanofibers were successfully formed. The result of FTIR indicates that PVA and chitosan exist in PVA/chitosan Nanofibers. SEM observation showed that the fiber has several hundred nanometers with a smooth surface. It also observed that fibers diameters decreased by increase percentage of chitosan, this occurs because of the conductivity of electrospun solution increase and the viscosity decrease. Reduction of fiber diameter followed by a decrease in pore size, this is a very important property of a membrane having a small pore size with high porosity. PVA/chitosan nanofibers have pH sensitive of swelling properties and better-swelling properties in acid conditions.

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