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بررسی تأثیر قطبیت میدان مغناطیسی خارجی و جهت اختلاف پتانسیل الکتریکی بر فرآیند الکتروریسی(دانلود)

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بررسی تأثیر قطبیت میدان مغناطیسی خارجی و جهت اختلاف پتانسیل الکتریکی بر فرآیند الکتروریسی

چكيده

الکتروریسی یکی از مهم‌ترین فرایندهاي تولید نانوالیاف در سال‌های اخیر است. در این فرایند میدان الکتریکی قوي بین نازل حاوي محلول پلیمري و جمع کننده اعمال می‌شود و جت الکتروریسی را تشکیل می‌دهد. جت ایجاد شده یک سري ناپایداری‌های خمشی را در فاصله‌ی الکتروریسی تحمل می‌کند و به دلیل حرکت نامنظم جت، نانوالیاف به طور تصادفی تشکیل لایه‌ای را بر روي جمع کننده می‌دهند که به دلیل سرعت بالاي جت، کنترل ناحیه‌ی تجمع مشکل است، اما روش‌های مختلفی براي کنترل جت و ناحیه‌ی تجمع وجود دارد. با استفاده از میدان مغناطیسی خارجی امکان کنترل ناپایداری خمشی وجود دارد.

در این تحقیق بر اساس متغیرهای نمک و قطبیت میدان مغناطیسی ، الکتروریسی نانو الیاف صورت پذیرفت. سپس با استفاده از اسکنر تصاویری از وب‌های تولید شده تهیه شد. با استفاده از نرم افزار مطلب مساحت وب‌های تولیدی محاسبه شد و با آزمون چند دامنه دانکن به تجزیه و تحلیل آماری پرداخته شد.

بررسی تأثیر قطبیت میدان مغناطیسی خارجی و جهت اختلاف پتانسیل الکتریکی بر فرآیند الکتروریسی

فهرست مطالب

عنوان                                                                                                                     صفحه

فصل اول: اصول مربوط به الکتروریسی و پارامترهای آن. 1

1-1-مقدمه. 2

1-2-الکتروریسی.. 3

1-3- فرآیند شکل گیری  جت پلیمر در عملیات الکتروریسی.. 4

1-3-1- مخروط تیلور 6

1-3-2- مسیر مستقیم جت.. 9

1-3-3- ناپایداری‌های جت.. 10

1-4- مدل کردن ناپایداری خمشی.. 14

1-5 پارامترهای مؤثر بر الکتروریسی.. 15

1-5-1-پارامترهای محلول.. 16

1-5-1-1-وزن مولکولی و ویسکوزیته محلول.. 16

1-5-1-2-کشش سطحی.. 17

1-5-1-3-ضریب هدایت الکتریکی محلول.. 18

1-5-1-4-تأثیر محتوای نمک… 18

1-5-2-پارامترهای فرآیند الکتروریسی.. 19

1-5-2-1-ولتاژ و میدان الکتریکی.. 20

1-5-2-2-نرخ تغذیه. 22

1-5-2-3-تأثیر جمع کننده. 22

1-5-2-4- فاصله نازل از جمع کننده. 23

1-5-2-5-اثرات قطبیت بر الکتروریسی.. 24

1-5-3-عوامل محیطی.. 25

1-5-3-1-دما 26

1-5-3-2-رطوبت… 26

1-5-3-3-نوع جوّ. 27

1-5-3-4-فشار. 27

فصل دوم: مروری بر تحقیقات گذشته. 28

2-1-مقدمه. 19

2-2- جمع کننده سيلندری با سرعت بالا.. 29

2-3- استفاده از یک جفت میدان الکتریکی در الکتروریسی……………………………………   30

2-4- الکتروریسی با میدان نزدیک… 33

فصل سوم: تجربیات… 39

3-1-بررسی­های تئوری انجام شده 40

3-2- انتخاب سیستم مختصات.. 41

3-3-تأثیر میدان مغناطیسی خارجی بر جت پلیمر…………………………………….42

3-4- بدست آوردن اندازه نیروها 47

3-5-مشخصات مواد مورد استفاده 53

3-6- مشخصات دستگاه­های مورد استفاده 55

3-6-1- دستگاه الکتروریسی.. 55

3-6-2- آهن­رباهای ایجاد کننده میدان مغناطیسی…………………………………. 56

3-6-3- سنسور اثر هال. 59

3-6-4-دستگاه كوتينگ يا پوشش­دهنده به روش كندوپاش.. 60

3-6-5-دستگاه ميكروسكوپ الكتروني روبشیSEM.. 61

3-7- روش انجام آزمايش… 62

3-7-1- تهيه محلول الكتروريسي.. 62

3-7-2- انجام الكتروريسي.. 63

3-8-اندازه­گیری چگالی شار میدان مغناطیسی بین نازل و جمع کننده 65

3-9-محاسبه سطح وب نانوالیاف جمع آوری شده 66

فصل چهارم: بحث و نتایج.. 70

4-1- مقدمه. 71

4-2-بررسی مساحت وب های تولید شده………………………….. 71

4-1-نتیجه­گیری.. 77

4-2-پیشنهادات.. 78

پیوست­ها 79

پیوست 1. 80

پیوست 2. 81

مراجع. 82

 

فهرست جداول

شماره جدول                                                                                                          صفحه

جدول 3-1- بعضی از مشخصات پلي­وینیل­الکل. 54

جدول 3-2- مشخصات  کلرید سدیم. 54

جدول3-3-مشخصات آهن­رباهای ساخته شده برای این تحقیق. 59

جدول 3-4-محدوده ولتاژ و چگالی شار مغناطیسی  اندازه­گیری شده توسط سنسور اثر هال. 60

جدول 3-5- شرایط یکسان در نظر گرفته شده برای انجام آزمایشات.. 64

جدول 3-6- شرایط حضور میدان مغناطیسی  و نمک برای الکتروریسی در این تحقیق. 65

جدول 3-7-چگالی شار مغناطیسی(B) برحسب تسلا. 66

جدول3-8-مساحت وب­های الکتروریسی شده 69

 جدول 4-1- آزمون Duncan برای میانگین مساحت­ وب­های تولیدی. ….72

 جدول 4- 2-جدول ANOVA  برای تاثیر متقابل متغیرها ….73

 جدول 4-3- جدول ANOVA  برای تاثیر اصلی هر متغیر ….73

فهرست اشکال

شماره شکل                                                                                                            صفحه

شکل 1-1-نمای شماتیکی از دستگاه الکتروریسی.. 4

شکل 1-2- مسیر جت پلیمر در حین الکتروریسی………………………..……………..5

شکل1-3- حالت قطره آویزان ……………………………………………………7

شکل 1-4- حالت قطره چسبیده. 8

شکل 1-5- تصاویر قطره‌ها در حالت) الف) و(ب) تصویر بدست آمده برای قطره چسبیده و تصویر (ج) و (و) برای حالت قطره آویخته می‌باشد.………….……………………………………….9 شکل1-6-آشفتگی‌های مربوط به ناپایداری‌ها الف -آشفتگی با عدد موج دو (ناپایداری انشعابی )، شکل ب- آشفتگی با عدد موج یک (ناپایداری خمشی )، شکل ج – آشفتگی با عدد موج صفر(ناپایداری تورمی )، شکل و -تصویر  سیلندری از سیال بدون آشفتگی…………………………………………………11

شکل 1-7- الف) نمای نزدیکی از شروع ناپایداری ب) جت ناپایدار ج)جت پایدار…….………13

شکل 1-8- الف)  عکس‌برداری با سرعت 4500  فریم بر ثانیه ب) عکس‌برداری با سرعت  30 فریم بر ثانیه…..………………………….…………………………………………………………13  شکل 1-9- نیروهای کولمبی اعمال شده توسط قطعات X,Z روی Y’……………..……… ……..15

شکل1-10- افزایش اندازه دانه تسبیحی‌ها در الیاف پلی­کاپریلونیتریل با افزایش نرخ تغذیه در [A] ml/hr 0.5و [B] ml/hr 2………..…………………………………………22

شکل 2-1-(الف)نمای شماتیکی از دستگاه الکتروریسی با جمع کننده سیلندری، (ب)تصویرSEM  از آرایش یافتگی نانوالیاف کلاژن نوع 1 با استفاده از جمع کننده سیلندری ……..…………….30

شکل2-2- الف-نمای شماتیکی از الکتروریسی با دو میدان الکتریکی عمود برهم، ب-تصویر SEM از نانوالیاف آرایش یافته در الکتروریسی با دو میدان عمود برهم ….………….…………….31

شکل2-3- الکتروریسی متداول الکتروریسی با  میدان نزدیک…………………..…………..32

شکل2-4- فاصله بین سوزن و جمع کننده در الکتروریسی با میدان نزدیک ….…….………33

شکل2-5- قطره پلیمر ایجاد شده توسط فشار پمپ…………………………..……………34

شکل 2-6- ایجاد شدن جت پلیمر………………………….. 38

شکل 2-7- نانوالیاف جمع آوری شده روی صفحه جمع کننده…………………….…………….35

شکل2-8- دستگاه الکتروریسی میدان نزدیک با جمع کننده متحرکت …….………………36

شکل 2-9- الف –نانوالیاف تهیه شده از  الکتروریسی متداول (ب)،(ج)،(و) نانو الیاف تولید شده با الکتروریسی میدان نزدیک با جمع کننده  متحرک ……………………………………37

شکل2-10-(الف)تحلیل مکانیکی الکتروریسی در حضور میدان مغناطیسی (ب)نیروی اعمال شده از میدان مغناطیسی بر جت الکتریکی در الکتروریسی…………. 42

شکل 3-1- درصدهای 0، 0.5و1  کلرید سدیم اضافه شده به پلی وینیل الکل به ترتیب مربوط به نمونه‌های c,b,a می‌باشد  40

شکل 3-2- مختصات استوانه و جهت بردار یکان‌های آن…………….…………………..……..42

شکل 3-3- نمای شما تیک الکتروریسی تحت میدان مغناطیسی خارجی (الف)-میدان مغناطیسی خارجی هم‌جهت با جریان (ب)-میدان مغناطیسی خارجی مخالف جهت جریان.. 45

شکل 3-4- الف- جهت نیروها در دستگاه مختصات استوانه‌ای ب- نیروهای مغناطیسی وارد بر نانوالیاف در حین الکتروریسی استوانه‌ای ………….…………………..44

شکل3-5- نیروهای مغناطیسی ناشی از جریان­های نزدیک به هم (الف)-دو جریان موازی هم­جهت (ب)-دو جریان موازی نا هم‌جهت… 45

شکل 3-6- قرارگیری هر یک از سیم‌ها در میدان ایجاد شده از سیم مقابل……………………….46

شکل3-7- دستگاه الکتروریسی مورد استفاده در این تحقیق…………………….………56 شکل3-8- نمای شماتیکی از آهن­رباهای الکتریکی میدان مغناطیسی ناشی از آن­ها 58

شکل 3-9- آهن­رباهای استفاده شده برای ایجاد میدان مغناطیسی خارجی در این تحقیق.. 58

شكل 3-10- سنسور اثر هال.. 61

شكل3-11- دستگاه لايه نشاني طلا (SEM)   61

شکل 3-12- ميکروسکوپ الکتروني روبشی(SEM) 62

شکل 3-13- الکتروریسی تحت میدان مغناطیسی خارجی الف-جهت شار میدان مغناطیسی هم جهت با میدان الکترواستاتیکی -ب- شار مغناطیسی در جهت مخالف میدان الکترواستاتیکی …….64

 شکل 3-14- دستگاه الکتروریسی تحت تأثیر میدان مغناطیسی خارجی.. 64

شکل 3-15- نمونه­ای از وب­های جمع­آوری شده-الف- در حضور میدان مغناطیسی خارجی هم جت با میدان الکترواستاتیکی همراه نمک ب- در حضور میدان مغناطیسی خارجی هم‌جهت با میدان الکترواستاتیکی ج-  بدون حضور میدان مغناطیسی خارجی همراه نمک د-  بدون حضور میدان مغناطیسی خارجی ه-  در حضور میدان مغناطیسی خارجی مخالف با جهت میدان الکترواستاتیکی، همراه نمک  و-  در حضور میدان مغناطیسی خارجی مخالف با جهت  میدان الکترواستاتیکی.. ………………67

شکل 3-16- تصاویر باینری وب­های الکتروریسی شده. ….69

شکل 4-1- نمودار میانگین مساحت وب­های جمع­آوری شده. ….74

 شکل 4-2-تصاویر SEM نانوالیاف ریسیده شده با بزرگنمایی 10000 برابر در شرایط : الف- در حضور میدان مغناطیسی خارجی هم جت با میدان الکترواستاتیکی همراه نمک ب- در حضور میدان مغناطیسی خارجی هم‌جهت با میدان الکترواستاتیکی ج-  بدون حضور میدان مغناطیسی خارجی همراه نمک د-  بدون حضور میدان مغناطیسی خارجی ه-  در حضور میدان مغناطیسی خارجی مخالف با جهت میدان الکترواستاتیکی، همراه نمک  و-  در حضور میدان مغناطیسی خارجی مخالف با جهت  میدان الکترواستاتیکی……………………………………………….………………………75

شکل 4-3- تصاویر SEM نانوالیاف ریسیده شده با بزرگنمایی 5000 برابر در شرایط : الف- در حضور میدان مغناطیسی خارجی هم جت با میدان الکترواستاتیکی همراه نمک ب- در حضور میدان مغناطیسی خارجی هم‌جهت با میدان الکترواستاتیکی ج-  بدون حضور میدان مغناطیسی خارجی همراه نمک د-  بدون حضور میدان مغناطیسی خارجی ه-  در حضور میدان مغناطیسی خارجی مخالف با جهت میدان الکترواستاتیکی، همراه نمک و-  در حضور میدان مغناطیسی خارجی مخالف با جهت میدان الکترواستاتیکی………………………………………….………………………76

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