The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
Huiming Cheng - One of the best experts on this subject based on the ideXlab platform.
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Growth Velocity and direct length sorted Growth of short single walled carbon nanotubes by a metal catalyst free chemical vapor deposition process
ACS Nano, 2009Co-Authors: Bilu Liu, Wencai Ren, Chang Liu, Chenghua Sun, Libo Gao, Chuanbin Jiang, Huiming ChengAbstract:We report on the observation of a very low Growth Velocity of single-walled carbon nanotubes (SWNTs) and consequently the direct length-sorted Growth and patterned Growth of SWNTs by using a metal-catalyst-free chemical vapor deposition (CVD) process proposed recently by our group, in which SiO(2) serves as catalyst. We found that the Growth Velocity of the SWNTs from SiO(2) catalyst is only 8.3 nm/s, which is about 300 times slower than that of the commonly used iron group catalysts (Co as a counterpart catalyst in this study). Such a slow Growth Velocity renders direct length-sorted Growth of SWNTs, especially for short SWNTs with hundreds of nanometers in length. By simply adjusting the Growth duration, SWNTs with average lengths of 149, 342, and 483 nm were selectively obtained and SWNTs as short as approximately 20 nm in length can be grown directly. Moreover, comparative studies indicate that the SiO(2) catalyst possesses a much longer catalytic active time, showing sharp contrast with the commonly used Co catalyst which quickly loses its catalytic activity. Taking advantage of the very slow Growth Velocity of the SiO(2) catalyst, patterned Growth of SWNT networks confined in a narrow region of <5 microm was also achieved. The short SWNTs may show intriguing physics owing to their finite length effect and are attractive for various practical applications.
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Growth Velocity and direct length sorted Growth of short single walled carbon nanotubes by a metal catalyst free chemical vapor deposition process
ACS Nano, 2009Co-Authors: Shisheng Li, Chuanbin Jiang, Huiming ChengAbstract:We report on the observation of a very low Growth Velocity of single-walled carbon nanotubes (SWNTs) and consequently the direct length-sorted Growth and patterned Growth of SWNTs by using a metal-catalyst-free chemical vapor deposition (CVD) process proposed recently by our group, in which SiO2 serves as catalyst. We found that the Growth Velocity of the SWNTs from SiO2 catalyst is only 8.3 nm/s, which is about 300 times slower than that of the commonly used iron group catalysts (Co as a counterpart catalyst in this study). Such a slow Growth Velocity renders direct length-sorted Growth of SWNTs, especially for short SWNTs with hundreds of nanometers in length. By simply adjusting the Growth duration, SWNTs with average lengths of 149, 342, and 483 nm were selectively obtained and SWNTs as short as ∼20 nm in length can be grown directly. Moreover, comparative studies indicate that the SiO2 catalyst possesses a much longer catalytic active time, showing sharp contrast with the commonly used Co catalyst wh...
Chuanbin Jiang - One of the best experts on this subject based on the ideXlab platform.
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Growth Velocity and direct length sorted Growth of short single walled carbon nanotubes by a metal catalyst free chemical vapor deposition process
ACS Nano, 2009Co-Authors: Bilu Liu, Wencai Ren, Chang Liu, Chenghua Sun, Libo Gao, Chuanbin Jiang, Huiming ChengAbstract:We report on the observation of a very low Growth Velocity of single-walled carbon nanotubes (SWNTs) and consequently the direct length-sorted Growth and patterned Growth of SWNTs by using a metal-catalyst-free chemical vapor deposition (CVD) process proposed recently by our group, in which SiO(2) serves as catalyst. We found that the Growth Velocity of the SWNTs from SiO(2) catalyst is only 8.3 nm/s, which is about 300 times slower than that of the commonly used iron group catalysts (Co as a counterpart catalyst in this study). Such a slow Growth Velocity renders direct length-sorted Growth of SWNTs, especially for short SWNTs with hundreds of nanometers in length. By simply adjusting the Growth duration, SWNTs with average lengths of 149, 342, and 483 nm were selectively obtained and SWNTs as short as approximately 20 nm in length can be grown directly. Moreover, comparative studies indicate that the SiO(2) catalyst possesses a much longer catalytic active time, showing sharp contrast with the commonly used Co catalyst which quickly loses its catalytic activity. Taking advantage of the very slow Growth Velocity of the SiO(2) catalyst, patterned Growth of SWNT networks confined in a narrow region of <5 microm was also achieved. The short SWNTs may show intriguing physics owing to their finite length effect and are attractive for various practical applications.
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Growth Velocity and direct length sorted Growth of short single walled carbon nanotubes by a metal catalyst free chemical vapor deposition process
ACS Nano, 2009Co-Authors: Shisheng Li, Chuanbin Jiang, Huiming ChengAbstract:We report on the observation of a very low Growth Velocity of single-walled carbon nanotubes (SWNTs) and consequently the direct length-sorted Growth and patterned Growth of SWNTs by using a metal-catalyst-free chemical vapor deposition (CVD) process proposed recently by our group, in which SiO2 serves as catalyst. We found that the Growth Velocity of the SWNTs from SiO2 catalyst is only 8.3 nm/s, which is about 300 times slower than that of the commonly used iron group catalysts (Co as a counterpart catalyst in this study). Such a slow Growth Velocity renders direct length-sorted Growth of SWNTs, especially for short SWNTs with hundreds of nanometers in length. By simply adjusting the Growth duration, SWNTs with average lengths of 149, 342, and 483 nm were selectively obtained and SWNTs as short as ∼20 nm in length can be grown directly. Moreover, comparative studies indicate that the SiO2 catalyst possesses a much longer catalytic active time, showing sharp contrast with the commonly used Co catalyst wh...
Sandra Y. Lin - One of the best experts on this subject based on the ideXlab platform.
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topical intranasal corticosteroids and Growth Velocity in children a meta analysis
International Forum of Allergy & Rhinology, 2015Co-Authors: David J. Mener, Josef Shargorodsky, Ravi Varadhan, Sandra Y. LinAbstract:Background There is no consensus regarding the effects on Growth Velocity of intranasal topical corticosteroid (ITC) use in children. The objective of this study was to determine whether ITC use reduces Growth Velocity in children with allergic rhinitis (AR). Methods A literature search of the National Center for Biotechnology Information PubMed, EMBASE, SCOPUS, and Cochrane databases from January 1, 1988 to October 7, 2013. The study selection was composed of randomized clinical trials investigating ITC for treatment of AR in children (age <18 years of age) with appropriate controls. Studies must have included interval change in Growth as an outcome. Two authors independently extracted data and assessed study quality. Eligible studies were pooled using a random-effects approach. Results Eight studies with 755 participants from 3 countries provided data for the meta-analysis (knemometry, n =342 participants; stadiometry, n =413 participants). Study duration ranged from 2 to 4 weeks for trials evaluating knemometry outcomes, and 12 months for trials evaluating stadiometry outcomes. Age of participants ranged from 3 to 12 years. The pooled standardized mean difference showed that among studies using knemometry, mean Growth was statistically significantly lower among children using ITC vs placebo (−.223 mm/week; 95% confidence interval [CI], −0.429 to −0.017; p < 0.034).The pooled standardized mean difference showed that among studies using stadiometry, there was no significant Growth difference among children using ITC vs placebo (−0.053 cm/year; 95% CI, −0.491 to 0.385; p = 0.813). The limitations of this study were the difficulty in predicting longer-term or catch-up Growth in children. Conclusion Meta-analytic pooling of trials suggest that short-term ITC for the treatment of AR in children may decrease short-term Growth Velocity using knemometry; however, the effect on longer-term Growth Velocity as measured by stadiometry is unclear.
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Topical intranasal corticosteroids and Growth Velocity in children: a meta‐analysis
International forum of allergy & rhinology, 2014Co-Authors: David J. Mener, Josef Shargorodsky, Ravi Varadhan, Sandra Y. LinAbstract:Background There is no consensus regarding the effects on Growth Velocity of intranasal topical corticosteroid (ITC) use in children. The objective of this study was to determine whether ITC use reduces Growth Velocity in children with allergic rhinitis (AR). Methods A literature search of the National Center for Biotechnology Information PubMed, EMBASE, SCOPUS, and Cochrane databases from January 1, 1988 to October 7, 2013. The study selection was composed of randomized clinical trials investigating ITC for treatment of AR in children (age
Shisheng Li - One of the best experts on this subject based on the ideXlab platform.
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Growth Velocity and direct length sorted Growth of short single walled carbon nanotubes by a metal catalyst free chemical vapor deposition process
ACS Nano, 2009Co-Authors: Shisheng Li, Chuanbin Jiang, Huiming ChengAbstract:We report on the observation of a very low Growth Velocity of single-walled carbon nanotubes (SWNTs) and consequently the direct length-sorted Growth and patterned Growth of SWNTs by using a metal-catalyst-free chemical vapor deposition (CVD) process proposed recently by our group, in which SiO2 serves as catalyst. We found that the Growth Velocity of the SWNTs from SiO2 catalyst is only 8.3 nm/s, which is about 300 times slower than that of the commonly used iron group catalysts (Co as a counterpart catalyst in this study). Such a slow Growth Velocity renders direct length-sorted Growth of SWNTs, especially for short SWNTs with hundreds of nanometers in length. By simply adjusting the Growth duration, SWNTs with average lengths of 149, 342, and 483 nm were selectively obtained and SWNTs as short as ∼20 nm in length can be grown directly. Moreover, comparative studies indicate that the SiO2 catalyst possesses a much longer catalytic active time, showing sharp contrast with the commonly used Co catalyst wh...
Bilu Liu - One of the best experts on this subject based on the ideXlab platform.
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Growth Velocity and direct length sorted Growth of short single walled carbon nanotubes by a metal catalyst free chemical vapor deposition process
ACS Nano, 2009Co-Authors: Bilu Liu, Wencai Ren, Chang Liu, Chenghua Sun, Libo Gao, Chuanbin Jiang, Huiming ChengAbstract:We report on the observation of a very low Growth Velocity of single-walled carbon nanotubes (SWNTs) and consequently the direct length-sorted Growth and patterned Growth of SWNTs by using a metal-catalyst-free chemical vapor deposition (CVD) process proposed recently by our group, in which SiO(2) serves as catalyst. We found that the Growth Velocity of the SWNTs from SiO(2) catalyst is only 8.3 nm/s, which is about 300 times slower than that of the commonly used iron group catalysts (Co as a counterpart catalyst in this study). Such a slow Growth Velocity renders direct length-sorted Growth of SWNTs, especially for short SWNTs with hundreds of nanometers in length. By simply adjusting the Growth duration, SWNTs with average lengths of 149, 342, and 483 nm were selectively obtained and SWNTs as short as approximately 20 nm in length can be grown directly. Moreover, comparative studies indicate that the SiO(2) catalyst possesses a much longer catalytic active time, showing sharp contrast with the commonly used Co catalyst which quickly loses its catalytic activity. Taking advantage of the very slow Growth Velocity of the SiO(2) catalyst, patterned Growth of SWNT networks confined in a narrow region of <5 microm was also achieved. The short SWNTs may show intriguing physics owing to their finite length effect and are attractive for various practical applications.
