مهندسی نساجی گیلان:. گیل تکس

مهندسی نساجی گیلان:. گیل تکس

سایت تخصصی نساجی و پوشاک
مهندسی نساجی گیلان:. گیل تکس

مهندسی نساجی گیلان:. گیل تکس

سایت تخصصی نساجی و پوشاک

Transport properties of Bulky PAN Nanofiber Mats

Transport properties of Bulky PAN Nanofiber Mats
Sedigheh Borhani1, Seyed Abdolkarim Hosseini Ravandi, Seyed Gholamreza Etemad

Abstract
In this study a non-conventional electrospinning technique was designed for production of high bulky polyacrylonitrile
(PAN) nanofiber mats. Optimum nanofiber mats are achieved with 15 wt% solution of PAN in DMF. Such mats result in a bulk porosity which is as high as 99.9 and density as low as 0.84x10-3
g/cm2 . Effect of nanofiber mats porosity on the
air permeability and moisture transfer was investigated. Based on the results, high bulky nanofiber mats possess high moisture transfer. Experimental data reveals that with a slightly decrease in the bulk porosity, air permeability decreased
noticeably, while moisture transfer changed slightly.
 Keywords: Polyacrylonitril, moisture transfer, Bulk porosity, Air permeability.

ادامه مطلب ...
مدیر سایت چهارشنبه 4 اردیبهشت‌ماه سال 1392 ساعت 10:06 ق.ظ
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ﺗﻬﻴﻪ اﻟﻴﺎف ﻧﺎﻧﻮ از ﭘﻠﻲوﻳﻨﻴﻞ اﻟﻜﻞ و ﺳﺮﺳﻴﻦ اﺑﺮﻳﺸﻢ ﺑﻪرو

ﺗﻬﻴﻪ اﻟﻴﺎف ﻧﺎﻧﻮ از ﭘﻠﻲوﻳﻨﻴﻞ اﻟﻜﻞ و ﺳﺮﺳﻴﻦ اﺑﺮﻳﺸﻢ ﺑﻪروش اﻟﻜﺘﺮورﻳﺴﻲ
ﻧﺮﮔﺲ ﻣﺤﻤﻮدی، ﻣﻬﺪی ﻧﻮری، ﻋﺬرا ﻏﻤﮕﺴﺎر، ﭘﺮواﻧﻪ ﺣﻴﺪری ، ﺳﻴﺪه ﻣﺤﺪﺛﻪ ﻣﻮﺳﻮی

ﭼﻜﻴﺪه
ﺳﺮﺳﻴﻦ اﺑﺮﻳﺸﻢ ، ﭘﺮوﺗﺌﻴﻨﻲ آﻧﺘﻲﺑﺎﻛﺘﺮﻳﺎل اﺳﺖ. ﻋﻼوه ﺑﺮ اﻳﻦ ، ﺳﺮﺳﻴﻦ ﺑﺪﻟﻴﻞ ﺣﻼﻟﻴﺖ در ﻣﺤﻴﻂ آﺑﻲ در PH ﻣﺸﺨﺺ ،از اﻣﻜﺎن ﻣﺨﻠﻮط ﺷﺪن ﺑﺎ ﭘﻠﻴﻤﺮﻫﺎی ﻣﺤﻠﻮل در آب ﻣﺎﻧﻨﺪ ﭘﻠﻲوﻳﻨﻴﻞ اﻟﻜﻞ (PVA) ﺑﺮﺧﻮردار اﺳﺖ . در اﻳﻦ ﻣﻘﺎﻟﻪ ﻧﺎﻧﻮ اﻟﻴﺎﻓﻲ از ﻣﺨﻠﻮط ﺳﺮﺳﻴﻦ و ﭘﻠﻲوﻳﻨﻴﻞ اﻟﻜﻞ ﺑﻪ روش اﻟﻜﺘﺮورﻳﺴﻲ ﺗﻬﻴﻪ . ﺷﺪ ﺟﻬﺖ ﺑﺮرﺳﻲ ﺳﺎﺧﺘﺎر اﻟﻴﺎف و ﻣﺤﺎﺳﺒﻪ ﻗﻄﺮ آن ، ﻫﺎ ﺗﺼﺎوﻳﺮ ﻣﻴﻜﺮوﺳﻜﻮپ اﻟﻜﺘﺮوﻧﻲ ﭘﻮﻳﺸﻲ ( SEM از ) ﻧﺎﻧﻮ اﻟﻴﺎف رﻳﺴﻴﺪه ﺷﺪه ﺗﻬﻴﻪ ﺷﺪ . ﺗﺄﺛﻴﺮ ﭘﺎراﻣﺘﺮﻫﺎی ﻣﺨﺘﻠﻒ اﻟﻜﺘﺮورﻳﺴﻲ ﺑﺮروی اﻟﻴﺎف ﺑﻪدﺳﺖ آﻣﺪه ﻣﻮرد ارزﻳﺎﺑﻲ ﻗﺮار ﮔﺮﻓﺖ . آﻧﺎﻟﻴﺰ ﺗﺼﺎوﻳﺮ SEM ﻧﺸﺎن داد ﻛﻪ اﻟﻴﺎف ﻣﺨﻠﻮط ﺳﺮﺳﻴﻦ و ﭘﻠﻲوﻳﻨﻴﻞ اﻟﻜﻞ دارای ﺳﻄﺢ ﻣﻘﻄﻊ ﺻﺎفﺗﺮی ﻧﺴﺒﺖ ﺑﻪ ﻧﻮع ﭘﻠﻲوﻳﻨﻴﻞ اﻟﻜﻞ اﺳﺖ و ﺑﺎ اﻓﺰاﻳﺶ ﻛﺴﺮ وزﻧﻲ ﺳﺮﺳﻴﻦ در ﻣﺨﻠﻮط %( 0-10 ،) ﺳﻄﺢ ﻣﻘﻄﻊ اﻟﻴﺎف رﻳﺴﻴﺪه ﺷﺪه ﺻﺎفﺗﺮ ﺷﺪ. ﻧﺘﺎﻳﺞ آزﻣﺎﻳﺶﻫﺎ ﻧﺸﺎن داد ﻛﻪ ﺑﺎ اﻓﺰاﻳﺶ ﻏﻠﻈﺖ ﻣﺤﻠﻮل ﭘﻠﻴﻤﺮی و ﭘﺘﺎﻧﺴﻴﻞ اﻟﻜﺘﺮﻳﻜﻲ ﻗﻄﺮ اﻟﻴﺎف ﺑﻪ ﺗﺮﺗﻴﺐ اﻓﺰاﻳﺶ و ﻛﺎﻫﺶ ﻳﺎﻓﺖ. ﻗﻄﺮ اﻟﻴﺎف رﻳﺴﻴﺪه ﺷﺪه در ﻣﺤﺪوده 440 - 600nm ﺑﻮد. ﺑﻨﺎﺑﺮاﻳﻦ، اﻳﻦ ﻧﺘﻴﺠﻪ ﭘﻴﺸﻨﻬﺎد داد ﻛﻪ اﻟﻴﺎف اﻟﻜﺘﺮورﻳﺴﻲ ﺷﺪه در ﻣﺤﺪوده ﻧﺎﻧﻮ ﻗﺮار دارد .
واژهﻫﺎی ﻛﻠﻴﺪی: ﭘﻠﻲوﻳﻨﻴﻞ اﻟﻜﻞ، ﺳﺮﺳﻴﻦ ، ﻣﻴﻜﺮوﺳﻜﻮپ اﻟﻜﺘﺮوﻧﻲ (SEM ،) اﻟﻜﺘﺮورﻳﺴﻲ ، ﻧﺎﻧﻮاﻟﻴﺎف

ادامه مطلب ...
مدیر سایت چهارشنبه 4 اردیبهشت‌ماه سال 1392 ساعت 10:02 ق.ظ
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ﺑﻬﺒﻮد آﺑﺪوﺳﺘﻲ دارﺑﺴﺖ ﻧﺎﻧﻮالیاف پلی ﻛﺎﭘﺮوﻻﻛﺘﻮن ﺟﻬﺖ ﻛﺎر

ﺑﻬﺒﻮد آﺑﺪوﺳﺘﻲ دارﺑﺴﺖ ﻧﺎﻧﻮالیاف پلی ﻛﺎﭘﺮوﻻﻛﺘﻮن ﺟﻬﺖ ﻛﺎرﺑﺮد در ﻣﻬﻨﺪﺳﻲ ﺑﺎﻓﺖ ﺳﻠﻮﻟﻬﺎ ی ﻋﺼﺒﻲ
 ﻻﻟﻪ ﻗﺎﺳﻤﻲ ﻣﺒﺎرﻛﻪ ، ﻣﻮﻻﻣﺎ ﭘﺮﺑﻬﺎﻛﺎران، ﻣﺤﻤﺪ ﻣﺮﺷﺪ ، ﻋﻠﻲ زادﻫﻮش  ، ﻣﺤﻤﺪ ﺣﺴﻴﻦ ﻧﺼﺮ اﺻﻔﻬﺎﻧﻲ
، ﺳﻴﺮام  راﻣﺎﻛﺮﻳﺸﻨﺎ


ﭼﻜﻴﺪه
ﻣﻬﻨﺪﺳﻲ ﺑﺎﻓﺖ ﻋﻠﻤﻲ ﭼﻨﺪ ﻣﻨﻈﻮره اﺳﺖ ﻛﻪ ﻋﻠﻮم ﻣﻬﻨﺪﺳﻲ و ﭘﺰﺷﻜﻲ را ﺑﻪ ﻳﻜﺪﻳﮕﺮ ارﺗﺒﺎط ﻣﻲدﻫﺪ . ﺳﻠﻮل،دارﺑﺴﺖ و ﺷﺮاﻳﻂ ﻛﺸﺖ ﺳﻠﻮل از ﻋﻨﺎﺻﺮ ﻣﻬﻢ در ﻣﻬﻨﺪﺳﻲ ﺑﺎﻓﺖ ﻣﻲﺑﺎﺷﻨﺪ . ﺑﻪ ﻣﻨﻈﻮر اﻳﺠﺎد ﻳﻚ دارﺑﺴﺖ اﻳﺪه آل ﻛﻪ ﺑﻌﻨﻮان ﻣﺎﺗﺮﻳﻜﺲ ﺧﺎرج ﺳﻠﻮﻟﻲ ﻃﺒﻴﻌﻲ در ﻣﻬﻨﺪﺳﻲ ﺑﺎﻓﺖ ﺑﻪ ﻛﺎر ﮔﺮﻓﺘﻪ ﺷﻮد ﻣﻬﻢ اﺳﺖ ﻛﻪ اﺑﻌﺎد ﻣﺎﺗﺮﻳﻜﺲ ﺧﺎرج ﺳﻠﻮﻟﻲ ﻃﺒﻴﻌﻲ ﺗﻘﻠﻴﺪ ﺷﻮد . اﺟﺰای ﺗﺸﻜﻴﻞ دﻫﻨﺪه ﻣﺎﺗﺮﻳﻜﺲ ﺧﺎرج ﺳﻠﻮﻟﻲ در ﺑﺪن دارای اﺑﻌﺎدی در ﺣﺪ ﻧﺎﻧﻮﻣﺘﺮ ﻣﻲﺑﺎﺷﺪ و ﺑﻬﻤﻴﻦ دﻟﻴﻞ دارﺑﺴﺘﻬﺎی ﻧﺎﻧﻮاﻟﻴﺎف اﻫﻤﻴﺖ زﻳﺎدی دارﻧﺪ. ﭘﻠﻲﻛﺎﭘﺮوﻻﻛﺘﻮن ﻳﻚ ﭘﻠﻴﻤﺮ آﻟﻴﻔﺎﺗﻴﻚ ﺧﻄﻲ اﺳﺖ ﻛﻪ ﺑ ﻪ ﻣﻴﺰان زﻳﺎدی در ﻣﻬﻨﺪﺳﻲ ﺑﺎﻓﺖ ﺑﻪ ﻛﺎر ﮔﺮﻓﺘﻪ ﺷﺪه اﺳﺖ. ﻳﻜﻲ از ﻣﻌﺎﻳﺐ ﻣﻬﻢ ﭘﻠﻲﻛﺎﭘﺮوﻻﻛﺘﻮن، ﻋﺪم وﺟﻮد ﮔﺮوﻫﻬﺎی ﻋﺎﻣﻠﻲ ﺑﺮﺳﻄﺢ زﻧﺠﻴﺮ ﭘﻠﻴﻤﺮی ﻣﻲﺑﺎﺷﺪ ﻛﻪ آن را ﺑﻪ ﭘﻠﻴﻤﺮی ﻫﻴﺪروﻓﻮب ﺗﺒﺪﻳﻞ ﻛﺮده اﺳﺖ. ﺑﺮ اﻳﻦ اﺳﺎس ﻫﺪف از اﻧﺠﺎم اﻳﻦ ﺗﺤﻘﻴﻖ، اﺻﻼح ﺧﻮاص دارﺑﺴﺖ ﻧﺎﻧﻮاﻟﻴﺎف ﭘﻠﻲ ﻛﺎﭘﺮوﻻﻛﺘﻮن ﺑﻪ روش ﻫﻴﺪروﻟﻴﺰ ﻗﻠﻴﺎﻳﻲ ﻣﻲﺑﺎﺷﺪ. ﺑﺮاﻳﻦ اﺳﺎس دارﺑﺴﺖ ﻧﺎﻧﻮاﻟﻴﺎف ﭘﻠﻲﻛﺎﭘﺮوﻻﻛﺘﻮن در ﻣﺤﻠﻮل ﻫﻴﺪروﻛﺴﻴﺪ ﺳﺪﻳﻢ ﻗﺮار داده ﺷﺪ و اﺛﺮ ﻫﻴﺪروﻟﻴﺰ ﻗﻠﻴﺎﻳﻲ ﺑﺮآﺑﺪوﺳﺘﻲ و اﺳﺘﺤﻜﺎم ﻣﻜﺎﻧﻴﻜﻲ دارﺑﺴﺖ ﻧﺎﻧﻮاﻟﻴﺎف ﭘﻠﻲﻛﺎﭘﺮوﻻﻛﺘﻮن ﺑﺮرﺳﻲ ﮔﺮدﻳﺪ. ﺳﭙﺲ ﺳﻠﻮﻟﻬﺎی ﺑﻨﻴﺎدی ﻋﺼﺒﻲ ﺑﺮ دارﺑﺴﺘﻬﺎی ﻧﺎﻧﻮاﻟﻴﺎف ﭘﻠﻲﻛﺎﭘﺮوﻻﻛﺘﻮن ﻫﻴﺪروﻟﻴﺰ ﺷﺪه و ﻫﻴﺪروﻟﻴﺰ ﻧﺸﺪه ﻛﺸﺖ داده ﺷﺪ و اﺛﺮ ﻫﻴﺪروﻟﻴﺰ ﻗﻠﻴﺎﻳﻲ ﺑﺮ ﺗﻜﺜﻴﺮ و ﻣﺮﻓﻮﻟﻮژی ﺳﻠﻮﻟﻬﺎی ﻋﺼﺒﻲ ﺑﺮرﺳﻲ ﮔﺮدﻳﺪ. ﻧﺘﺎﻳﺞ آزﻣﺎﻳﺸﺎت اﻧﺠﺎم ﺷﺪه ﻧﺸﺎن داد ﻛﻪ ﻫﻴﺪروﻟﻴﺰ ﻗﻠﻴﺎﻳﻲ ﺑﺎﻋﺚ اﻓﺮاﻳﺶ آﺑﺪوﺳﺘﻲ دارﺑﺴﺖ ﻧﺎﻧﻮاﻟﻴﺎف ﭘﻠﻲﻛﺎﭘﺮوﻻﻛﺘﻮن ﻣﻲﮔﺮدد و اﻳﻦ اﻣﺮ ﻧﻴﺰ ﺑﺎﻋﺚ اﻓﺰاﻳﺶ رﺷﺪ و ﺗﻜﺜﻴﺮ ﺳﻠﻮاﻫﺎ و ﺑﻬﺒﻮد ﻣﺮﻓﻮﻟﻮژی ﺳﻠﻮﻟﻬﺎی ﻋﺼﺒﻲ ﺑﺮ دارﺑﺴﺖ ﻧﺎﻧﻮاﻟﻴﺎف ﻫﻴﺪروﻟﻴﺰ ﺷﺪه ﻧﺴﺒﺖ ﺑﻪ دارﺑﺴﺖ ﻧﺎﻧﻮاﻟﻴﺎف ﻫﻴﺪروﻟﻴﺰ ﻧﺸﺪه ﻣﻲﮔﺮدد .
واژهﻫﺎی ﻛﻠﻴﺪی: ﭘﻠﻲﻛﺎﭘﺮوﻻﻛﺘﻮن ، ﻣﻬﻨﺪﺳﻲ ﺑﺎﻓﺖ، دارﺑﺴﺖ ﻧﺎﻧﻮاﻟﻴﺎف، ﻫﻴﺪروﻟﻴﺰ ﻗﻠﻴﺎﻳﻲ

ادامه مطلب ...
مدیر سایت چهارشنبه 4 اردیبهشت‌ماه سال 1392 ساعت 10:00 ق.ظ
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Improving UV Stabilization of wool Fabrics Using Nano TiO2

Improving UV Stabilization of wool Fabrics Using Nano TiO2
 Esfandiar Pakdel1, Majid Montazer
Abstract Wool is the most important animal fiber used by textile industry but its photo-stability is very low. Scientists searched for new ways to increase the photo-stability of wool. Nano TiO2 particles have good features to make them suitable for new applications. One of them is UV-blocking power that was used for protection fabrics against UV-rays. Treating wool fabrics with TiO2 can be effective for controlling the photo- degradation. This study focused on protection of wool fabric against UV rays. In this research, oxidized and raw wool were treated with citric acid (CA) as cross-linking agent and different concentrations of TiO2. XRD patterns proved the existence of nano TiO2 particles on the wool surface. The whiteness and yellowness of samples treated with titanium dioxide were also discussed. The results showed that TiO2 was a suitable UV absorber and its effect depends on concentration.
Keywords: Wool, Yellowness, Whiteness, UV rays, Titanium dioxide, Cross-linking agent

ادامه مطلب ...
مدیر سایت چهارشنبه 4 اردیبهشت‌ماه سال 1392 ساعت 09:56 ق.ظ
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ﻣﻄﺎﻟﻌﺎت ﻣﺮﻓﻮﻟﻮژﻳﻜﻲ ﺑﺮ ﻧﺎﻧﻮاﻟﻴﺎف اﻟﻜﺘﺮورﻳﺴﻲ ﺷﺪه ازﻣ

ﻣﻄﺎﻟﻌﺎت ﻣﺮﻓﻮﻟﻮژﻳﻜﻲ ﺑﺮ ﻧﺎﻧﻮاﻟﻴﺎف اﻟﻜﺘﺮورﻳﺴﻲ ﺷﺪه ازﻣﺨﻠﻮط آﻟﺠﻴﻨﺎت ﺳﺪﻳﻢ ﺑﺎ ﭘﻠﻴﻤﺮﻫﺎی ﻫﻴﺪروﻓﻴﻞ
ﻫﮋﻳﺮ ﺑﻬﺮاﻣﻲ ، ﻋﺎدﻟﻪ ﻗﻠﻲ ﭘﻮر ﻛﻨﻌﺎﻧﻲ
ﭼﻜﻴﺪه
ﻧﺎﻧﻮاﻟﻴﺎف ﭘﻠﻴﻤﺮی دارای ﻗﺎﺑﻠﻴﺖ اﺳﺘﻔﺎده در رﻧﺞ وﺳﻴﻌﻲ از ﻛﺎرﺑﺮدﻫﺎی ﺑﻴﻮﻟﻮژﻳﻜﻲ و ﭘﺰﺷﻜﻲ ﻣﻲ ﺑﺎﺷﻨﺪ. وب ﻫﺎی ﻧﺎﻧﻮﻟﻴﻔﻲ ﺑﻪ دﻟﻴﻞ ﭘﺘﺎﻧﺴﻴﻞ ﺑﺎﻻ ﺑﺮای ﺗﻘﻠﻴﺪ و ﺷﺒﻴﻪ ﺳﺎزی ﻣﺎﺗﺮﻳﺲ ﺧﺎرج ﺳﻠﻮﻟﻲ ﻃﺒﻴﻌﻲ ﺑﺪن (ECM) از ﻟﺤﺎظ ﺳﺎﺧﺘﺎری، ﺗﺮﻛﻴﺐ ﺷﻴﻤﻴﺎﻳﻲ و وﻳﮋﮔﻲ ﻫﺎی ﻣﻜﺎﻧﻴﻜﻲ ﺑﺴﻴﺎر ﻣﻮرد ﺗﻮﺟﻪ ﻗﺮار ﮔﺮﻓﺘﻪ اﻧﺪ. در اﻳﻦ ﻣﻘﺎﻟﻪ، ﻣﺤﻠﻮل ﻫﺎی ﻣﺨﻠﻮط آﻟﺠﻴﻨﺎت ﺳﺪﻳﻢ(NaAlg) / ﭘﻠﻲ(وﻳﻨﻴﻞ اﻟﻜﻞ)(PVA) و NaAlg/ ﭘﻠﻲ اﺗﻴﻠﻦ اﻛﺴﺎﻳﺪ(PEO) ﺑﺎ ﻧﺴﺒﺖ ﻫﺎی ﺟﺮﻣﻲ ﻣﺘﻔﺎوت  ﻗﺮار اﻟﻜﺘﺮورﻳﺴﻲ ﻣﻮرد (100/0 ،25/75 ،35/65 ،50/50 ،65/35 ،75/25 ( ، PEO ﻳﺎ PVA ) 0/(NaAlg)100)ﮔﺮﻓﺖ. وﻟﺘﺎژ اﻋﻤﺎﻟﻲ (10-25KV) ﻣﺘﻐﻴﻴﺮ ﺑﻮده در ﺣﺎﻟﻴﻜﻪ ﻓﺎﺻﻠﻪ ﻧﺎزل ﺗﺎ ﺟﻤﻊ ﻛﻨﻨﺪه (15 ﺳﺎﻧﺘﻲ ﻣﺘﺮ) و ﻧﺮخ ﺧﺮوج ﭘﻠﻴﻤﺮ (0.4 ml/hr) ﺛﺎﺑﺖ ﻧﮕﻪ داﺷﺘﻪ ﺷﺪﻧﺪ. ﻣﺤﻠﻮل آﻟﺠﻴﻨﺎت ﺳﺪﻳﻢ ﺑﻪ دﻟﻴﻞ ﻧﻴﺮوﻫﺎی داﻓﻌﻪ ﺑﺎﻻ ﺑﻴﻦ زﻧﺠﻴﺮﻫﺎی آﻧﻴﻮﻧﻴﻚ ﭘﻠﻴﻤﺮ ﺑﻪ ﺗﻨﻬﺎﻳﻲ ﻗﺎﺑﻠﻴﺖ اﻟﻜﺘﺮورﻳﺴﻲ ﻧﺪارﻧﺪ. اﻳﻦ درﺣﺎﻟﻴﺴﺖ ﻛﻪ ﺑﺎ اﻓﺰدون ﭘﻠﻴﻤﺮﻫﺎی آﺑﺪوﺳﺘﻲ ﭼﻮن ﭘﻠﻲ وﻳﻨﻴﻞ اﻟﻜﻞ و ﭘﻠﻲ اﺗﻴﻠﻦ اﻛﺴﺎﻳﺪ در ﻧﺴﺒﺖ ﻫﺎی ﺑﺎﻻﺗﺮ از 50/50 رﻳﺴﻨﺪﮔﻲ اﻳﻦ ﭘﻠﻴﻤﺮ و ﺗﺒﺪﻳﻞ آن ﺑﻪ ﻧﺎﻧﻮاﻟﻴﺎف اﻣﻜﺎن ﭘﺬﻳﺮ ﻣﻲ ﺷﻮد.
واژهﻫﺎی ﻛﻠﻴﺪی: ﻧﺎﻧﻮاﻟﻴﺎف، ﺑﻴﻮﭘﻠﻴﻤﺮ، آﻟﺠﻴﻨﺎت ﺳﺪﻳﻢ، دارﺑﺴﺖ ﻫﺎی ﺑﻴﻮﻟﻮژﻳﻚ، اﻟﻜﺘﺮورﻳﺴﻲ

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مدیر سایت چهارشنبه 4 اردیبهشت‌ماه سال 1392 ساعت 09:54 ق.ظ
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ﺑﻬﺒﻮد ﻣﻘﺎوﻣﺖ ﻛﺎﻻی ﭘﺸﻤﻲ در ﺑﺮاﺑﺮ آب و ﻗﻠﻴﺎ ﺑﻮﺳﻴﻠﻪ ﻧﺎﻧ

ﺑﻬﺒﻮد ﻣﻘﺎوﻣﺖ ﻛﺎﻻی ﭘﺸﻤﻲ در ﺑﺮاﺑﺮ آب و ﻗﻠﻴﺎ ﺑﻮﺳﻴﻠﻪ ﻧﺎﻧﻮ ﺗﻴﻮب ﻛﺮﺑﻦ
 ﻣﺤﻤﺪ ﺛﻤﻴﻦ ﻗﻴﻢ اﺻﻐﺮی ،ﻣﺠﻴﺪ ﻣﻨﺘﻈﺮ
ﭼﻜﻴﺪه
در اﻳﻦ ﺑﺮرﺳﻲ ﺳﻌﻲ ﺷﺪه اﺳﺖ ﺗﺎ ﺬﺟ ب ﻗﻄﺮه آب و ﺣﻼﻟﻴﺖ ﻗﻠﻴﺎﻳﻲ ﻛﺎﻻی ﭘﺸﻤﻲ ﭘﺲ از ﻋﻤﻞ ﺑﺎ ﻧﺎﻧﻮ ﺗﻴﻮب ﻛﺮﺑﻦ ( CNT ﺑﺮ) رﺳﻲ و ﮔﺰارش ﺷﻮد. اﺑﺘﺪا ﻧﻤﻮﻧﻪ ﭘﺎرﭼﻪ ﭘﺸﻤﻲ ﺑﻪ ﻣﻨﻈﻮر اﻓﺰاﻳﺶ ﺧﺼﻮﺻﻴﺎت ﺟﺬﺑﻲ ﺗﻮﺳﻂ ﭘﺮﻣﻨﮕﻨﺎت ﭘﺘﺎﺳﻴﻢ در ﺣﻀﻮر ﻛﻠﺮﻳﺪ ﺳﺪﻳﻢ اﻛﺴﻴﺪ ﺷﺪه اﺳﺖ. ﺑﻪ ﻣﻨﻈﻮر اﻓﺰاﻳﺶ ﭘﺎﻳﺪاری ﻧﺎﻧﻮ ﺗﻴﻮب ﻛﺮﺑﻦ روی ﭘﺎرﭼﻪ ﭘﺸﻤﻲ از ﻋﺎﻣﻞ اﻳﺠﺎد ﻛﻨﻨﺪه ﭘﻴﻮﻧﺪ ﻋﺮﺿﻲ، اﺳﻴﺪ ﺳﻴﺘﺮﻳﻚ ، ﺑﻪ ﻫﻤﺮاه ﻛﺎﺗﺎﻟﻴﺰور ﻫﻴﭙﻮ ﻓﺴﻔﻴﺖ ﺳﺪﻳﻢ اﺳﺘﻔﺎده ﺷﺪه اﺳﺖ. ﻣﺪت زﻣﺎن ﺟﺬب ﻗﻄﺮه آب و ﻣﻴﺰان ﺣﻼﻟﻴﺖ ﻗﻠﻴﺎﻳﻲ ﻛﺎﻻﻫﺎی ﭘﺸﻤﻲ ﻋﻤﻞ ﺷﺪه و ﻧﺸﺪه ﺑﺮرﺳﻲ ﺷﺪه و ﺑﻪ ﻛﻤﻚ ﻧﺘﺎﻳﺞ ﺑﺪﺳﺖ آﻣﺪه از ﺗﺼﻮﻳﺮﺑﺮداری ﻣﻴﻜﺮوﺳﻜﻮپ اﻟﻜﺘﺮوﻧﻲ، ﻃﻴﻒ ﺳﻨﺠﻲ FTIR ﻧﺘﺎﻳﺞ ﺗﺠﺰﻳﻪ و ﺗﺤﻠﻴﻞ ﺷﺪه اﻧﺪ . .
واژهﻫﺎی ﻛﻠﻴﺪی: ﻧﺎﻧﻮ ﺗﻴﻮب ﻛﺮﺑﻦ ، ﭘﺸﻢ، اﺳﻴﺪ ﺳﻴﺘﺮﻳﻚ، ﺟﺬب ﻗﻄﺮه آب، ﺣﻼﻟﻴﺖ ﻗﻠﻴﺎﻳﻲ
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مدیر سایت چهارشنبه 4 اردیبهشت‌ماه سال 1392 ساعت 09:17 ق.ظ
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Influence of Silica Nanolayers on the Water Diffusion through th


Influence of Silica Nanolayers on the Water Diffusion through the PMMA/Layered Silicate Nanocomposites

Akram Eyvazkhani, Mohammad Karimi

Abstract
In this work, sorption process of water in poly (methyl methacrylate) (PMMA) and its nanocomposites with Cloisite 30B and Cloisite 15A (PMMA/C30B and PMMA/C15A) was investigated using ATR-FTIR method. This technique is an experimental method that measures liquid sorption kinetics in situ. In addition to the sorption kinetics, a spectroscopic technique also gives information regarding the molecular state of the penetrant at various times in the diffusional process. Calculated diffusion coefficient of samples was 3.35×10-8
, 3.15×10-9
and 1.79×10-9
cm2
/s for PMMA, PMMA/C15A and PMMA/C30B respectively. The decrease in the diffusivity of nanocomposites is related to the fact that penetrant molecules have to circumvent the silicate nanolayers and thus 'travel' a much longer distance through nanocomposites than through a neat polymer. X-ray and DSC analysis showed that the structure of PMMA/C15A and PMMA/C30B are intercalated and exfoliated respectively. Due to the more dispersion of nanoclays in exfoliated structure and creating more tortuous path, the decrease in the diffusivity of PMMA/C30B was higher than PMMA/C15A.

Keywords: Diffusion, Poly(methyl methacrylate), FTIR-ATR, Layered silicate, Intercalated, Exfoliated.

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مدیر سایت چهارشنبه 4 اردیبهشت‌ماه سال 1392 ساعت 08:58 ق.ظ
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Novel Method Synthesizing Colloidal Silver Nano Particles Using

Novel Method Synthesizing Colloidal Silver Nano Particles Using Lecithin
Hossein Barani, Majid Montazer, Tayebeh Toliyat, Nasrin Samadi
Abstract Silver nanoparticles were synthesized and stabilized by a simple and environment friendly method in a nanoliposomes structure. Nanoliposomes were prepared by facing lecithin to the aqueous phase solutions while stirring vigorously. In this method, the lecithin concentration to silver nitrate ratio (KLec/Ag = [Lecithin]/ [AgNO3]) is the influencing factor in synthesis of silver nanoparticles. The influence of the factor on the stability, size distribution, and antibacterial properties of synthesized silver nanoparticles were studied by UV-visible, dynamic light scattering (DLS), and antibacterial assay. The UV spectra indicated a single symmetric extinction peak at 400 nm confirming spherical shape of the synthesized silver nanoparticles. A high KLec/Ag value leads to reducing the intensity of extinction spectra and size of Ag-liposomes nanoparticles. The stabilized silver nanoparticle with various lecithin concentrations showed a good antibacterial activity against Staphylococcus aureus a gram positive bacterium and Eschericia coli a gram negative bacterium.
 Keywords: Nanoliposome, Silver Nanoparticle, Antibacterial.

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مدیر سایت چهارشنبه 4 اردیبهشت‌ماه سال 1392 ساعت 08:55 ق.ظ
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