پديد آورنده :
كمالي مقدم، مقداد
عنوان :
ريز كپسول سازي ماده تغيير فاز دهنده n- نونادكان درون پوسته پليميري آلجينات به روش ذوب - الكترواسپري با دو نازل هم محور به منظور كاربرد در منسوجات تنظيم كننده دما
گرايش تحصيلي :
نساجي وعلوم الياف
محل تحصيل :
اصفهان:دانشگاه صنعتي اصفهان، دانشكده نساجي
صفحه شمار :
نوزده، 123ص:مصور ،جدول، نمودار
استاد راهنما :
مجيد مرتضوي
استاد مشاور :
تقي خياميان
توصيفگر ها :
الكترو اسپري هم محور , پارچه تنظيم كننده دما
تاريخ نمايه سازي :
1394/04/16
استاد داور :
محمد حقيقت كيش،اكبر خدامي، سعيد نوري خراساني
كد ايرانداك :
ID762 دكتري
چكيده فارسي :
به فارسي و انگليسي
چكيده انگليسي :
AbstractPhase change materials PCMs are substances that are capable of storing or releasing a largeamount of energy as they melt and solidify at a specified temperature range Due to theincreasing consumption of limited fossil fuel and worsened the environment the use of PCMsfor heat energy storage is becoming increasingly important both strategically and economically The microencapsulation of PCMs provides some benefits effects on the thermal storage transition and application properties Nowadays PCMs have drawn increasing interest toprovide enhanced thermal functionalities in a wide variety of applications such as thermoregulating textiles solar energy absorber building etc Up to now there have been manymethods to encapsulate PCMs but it is still significant and desired to develop facile andcontrollable methods to encapsulate PCMs with biopolymer shell In this thesis the developmental electrospray method called melt coaxial electrospray was usedfor encapsulation of PCMs The n nonadecane as core material and sodium alginate and chitosanas shell polymer was used Taguchi method was used to optimum the encapsulation conditions reduce the experimentaltime and statistical analysis of the results The effect of experimental parameters parametersmeaningful and the role of each parameter were studied using Minitab 15 The effectiveparameters were considered including alginate concentration the feed rate of the polymersolution the feed ratio of the shell to the core needle gauge needle length electrospray distance and magnetic stirring speed The results show that alginate concentration and needle gauge havethe highest effect and needle length and magnetic stirrer speed have the lower effect onproperties of capsules Four different structures of the coaxial nozzle were produced to feed thecore and shell material separately According to the figures obtained from optical microscopy the optimum coaxial nozzle was selected as the inner needle exit is approximately 0 5 mm abovethe outer needle exit The production of alginate nonadecane capsules was confirmed by opticalmicroscopy images Fourier transformed infrared FT IR spectroscopy and differential scanningcalorimetry DSC DSC analysis indicated that microcapsules consisted of 82 wt n nonadecane Results from scanning electron microscopy SEM showed that the uniform circularmicrocapsules can be obtained by regulating of coaxial electrospray parameters The results alsoshowed that the capsules with a diameter lower than 200 nm can be achieved The cotton fabricwas used to prepare the thermo regulating fabric Results from thermal analyses showed that thefinished fabric with a binder containing PCM capsules have the significant effect on thermoregulating of fabric in the temperatures range of melt point of PCM The results of this studyindicated that the temperature of treated fabric with PCM capsule is lower than untreated fabricin a warm environment Moreover the results showed that the PCM capsules kept the fabrictemperature in the range of 30 35 C for 9 15 min with increasing the temperature ofenvironments Keywords Coaxial Electrospray Nano and Microcapsule Phase Change Materials SodiumAlginate Thermo regulating Fabric
استاد راهنما :
مجيد مرتضوي
استاد مشاور :
تقي خياميان
استاد داور :
محمد حقيقت كيش،اكبر خدامي، سعيد نوري خراساني
