Polymer and nanocomposite patterning by dip pen nanolitography
Başlık çevirisi mevcut değil.
- Tez No: 403365
- Danışmanlar: Prof. Dr. RALPH SPOLENAK
- Tez Türü: Doktora
- Konular: Metalurji Mühendisliği, Metallurgical Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2016
- Dil: İngilizce
- Üniversite: Eidgenössische Technische Hochschule Zürich (ETH)
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 117
Özet
Özet yok.
Özet (Çeviri)
Polymer and nanocomposite based surface patterning by Dip Pen Nanolithography (DPN) was investigated in this study. First, the focus was on producing consistent and reproducible polymer patterns. Later, it is aimed to use this patterning experience to build nanocomposite surface architectures. Nanocomposite patterning was further improved to construct gradient nanocomposite structures. Mechanical characterizations suitable for the micro-ranged nanocomposite patterns were investigated and successfully conducted. DPN writing mechanisms for liquid polymer ink were found which led to construction of patterns having consistent sizes with their dwell times/writing speeds. Previous studies of O'connel et al. [1], [2] revealed the effect of ink volume (Laplace pressure) for liquid ink writing. In our study, it is shown that not only the ink volume, but also physisorption and surface diffusion are relevant. It is confirmed that in the first writing steps, the effect of ink volume is higher than in the subsequent writing steps. In consecutive writing steps; physisorption and surface diffusion prevail leading to consistent pattern sizes with dwell times and writing speeds. Ink delivery is, on one hand, increased by a decreased viscosity of the ink, e.g. at high relative humidity, and on the other hand by more hydrophilic substrates. Therefore, three main parameters to build consistent patterns were revealed to be ink amount, surface hydrophilicity and ink viscosity. In the case of nanocomposite patterning, it is crucial to maintain even distribution of particles in the matrix to preserve composite properties. In this study, it is confirmed that particles are deposited together with polymer matrix and are homogeneously distributed within the written material. Focused Ion Beam cutting of nanocomposite patterns with subsequent Scanning Electron Microscopy and Scanning Transmission Electron Microscopy characterizations proved that high concentrations of nanoparticles are evenly distributed in the polymer matrix. The constraints for nanocomposite patterning are revealed to be the same as polymer patterning with the addition of adjustment of nanoparticle concentration since the particle loading changes the viscosity of the matrix polymer. According to our knowledge, there is no study regarding the mechanical properties of nanocomposite patterns written by DPN. In this study, colloidal probe microscopy and nanoindentation tests proved that particle concentration in the nanocomposite ink is proportional to hardness and especially modulus values of the written patterns. Gradient polymer nanocomposite patterns were successfully produced for the first time in DPN history. The scale and height of the patterns were adjusted by tuning the dwell times, the relative humidity levels and the number of approach/curing steps. A spatial resolution of 3-20 μm was achieved. It is confirmed that gradient nanocomposite patterns have graded hardness and modulus values tuned by locally adjusted particle concentration. Polymer patterning was further improved by building multilayer polymer structures showing the ways to construct 3-D architectures. It is indicated that UV curing between writing steps is essential to increase thickness of written patterns. Additionally, it is revealed that the thickness of the patterns could be further heightened by tuning the hydrophilicity of the polymer ink. To summarize, polymer and nanocomposite structures with consistent sizes and reproducible mechanical properties were produced. The information obtained from polymer/nanocomposite patterning and mechanical characterizations was utilized to build gradient nanocomposite structures having graded mechanical properties. Additionally, polymer patterning was further elaborated by building multilayer polymer structures suggesting the ways to construct 3-D architectures.
Benzer Tezler
- UV ile kürleşebilen antibakteriyel kaplamalar
UV curable antimicrobial coatings
HİCRET KIRTAY
Yüksek Lisans
Türkçe
2016
Polimer Bilim ve TeknolojisiYıldız Teknik ÜniversitesiKimya Ana Bilim Dalı
PROF. DR. NERGİS ARSU
- Fotopolimerizasyon reaksiyonu ile in-situ altın nanoparçacık/polimer nanokompozit filmlerin eldesi ve karakterizasyonu
In-situ photopolymerization synthesis and characterization of nanocomposite films obtained by using crosslinked acrylic based polymers and gold nanoparticles
TOLGA ÇEPER
- İn-situ fotopolimerizasyon yöntemiyle gümüş nanoparçacık/polimer nanokompozit malzemelerin hazırlanması: Gümüş ayna
In-situ preparation of nano silver /polymer nanocomposite thin films by photopolymerization method: Silver mirror
MELİSA ADIBELLİ
- Polianilin ve polidopamin kopolimerlerinin sentezi, PbI2 ile doplanması ve spektroskopik incelenmesi
Synthesis of polyaniline and polydopamine copolymers, doping with PbI2 and spectroscopic investigation
MERVE HERCAN MAMMAD
Doktora
Türkçe
2024
Polimer Bilim ve TeknolojisiSakarya ÜniversitesiKimya Ana Bilim Dalı
PROF. DR. MUSTAFA GÜLFEN
- Anilin ve 3,4-metilendioksi anilin'in elektrokimyasal polimer film eldesi ile TiO2 nanopartikül kompozit eldelerinin karşılaştırılması ve anti-korozyon davranışlarının incelenmesi
The comparision of electrocoated polymer films of aniline and 3,4-methylenedioxy aniline together with TiO2 nanoparticule composites and anti-corrosion behaviors
OKAN KALENDAR