نتایج جستجو برای: pnipaam

تعداد نتایج: 201  

F. Asadifard G.R. Shahhosseini, M. Enayatollahi M. Shapourgan R. Haghjo S. Heidari Keshel

Poly N-isopropylacrylamide was successfully grafted onto a polystyrene cell culture dish by gamma ray. In this study, the effect of a radiation dose (radiation absorbed dosages of 10, 20, 30, 40 KGy) under appropriate temperature and grafting conditions was investigated. The FTIR analysis showed the existence of the graft PNIPAAm on the substrate. The optimal value of the dose for grafting was ...

2011
ESMAEIL BIAZAR HOSSEIN MOHAMMADI

The UV radiation method is a suitable method for grafting processes . Poly-Nisopropylacrylamide was successfully grafted onto a polystyrene surface with benzophenone initiator under UV radiation. The ATR-FTIR analysis showed the existence of the graft poly-N-isopropylacrylamide (PNIPAAm) on the surface by this method. The scanning electron microscopy and atomic force microscopy (AFM) images cle...

2010
Esmaeil Biazar Reza Zeinali Naser Montazeri Khalil Pourshamsian Mahmoud Jabarvand Behrouz Azadeh Asefnejad Ahad Khoshzaban Gholamreza Shahhosseini Mostafa Soleimannejad Najafabadi Reza Abyani Hamidreza Jamalzadeh Mahdi Fouladi Sasan Rahbar F Hagh Aylar Shams Khamaneh Soudabeh Kabiri Saeed Heidari Keshel Ana Mansourkiaei

Poly-N-isopropylacrylamide was successfully grafted onto a polystyrene cell culture dish and γ-preirradiated in air. In this study, the effect of a γ-pre-irradiation dose of radiation (radiation absorbed dosages of 10, 20, 30, 40 KGy) under appropriate temperature and grafting conditions was investigated. The Fourier transform infrared spectroscopy analysis showed the existence of the graft pol...

Journal: :Langmuir : the ACS journal of surfaces and colloids 2011
Lindsay C C Elliott Moussa Barhoum Joel M Harris Paul W Bohn

Spatial and temporal heterogeneities in expanded and collapsed surface bound poly(N-isopropylacrylamide), pNIPAAm, films are studied by single molecule tracking (SMT) experiments. Tracking data are analyzed using both radius of gyration (R(g)) evolution and confinement level calculations to elucidate the range of behaviors displayed by single Rhodamine6G (R6G) molecules. Confined diffusion that...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تبریز - دانشکده شیمی 1391

pnipaam یک مقدار lcst در حدود c° 32 را در محلول های آبی نشان می دهد. lcst معرف یک دمای فوق بحرانی است. در دماهای فوق بحرانی منفی که در دماهای کمتر از آن (tlcst) هیدروژل محلول می شود. در کار پژوهشی حاضر pn...

2012
Shingo Maeda Yusuke Hara Satoshi Nakamaru Hiroki Nakagawa Shuji Hashimoto

A wide variety of soft actuators have been studied with the progress of the intelligent materials. Especially, stimuli-responsive polymers and gels which swell or shrink in response to the environmental changes such as temperature (Hirokawa & Tanaka, 1984), electric field (Tanaka et al., 1984), light (Suzuki & Tanaka, 1990)], etc have been applied to the actuation devices. In previous decades, ...

Journal: :Langmuir : the ACS journal of surfaces and colloids 2007
Huilin Tu Liang Hong Stephen M Anthony Paul V Braun Steve Granick

Phase-contrast microscopy and particle tracking algorithms are used to study the near-surface diffusion of poly(N-isopropylacrylamide) (PNIPAAm) brush functionalized micron-sized silica microspheres after sedimentation from aqueous suspension onto planar substrates coated with a similar polymer brush above and below the lower critical solution temperature (LCST) of PNIPAAm, 32 degrees C. A smal...

Journal: :Biotechnology and bioengineering 2017
Amir Mellati Chia-Ming Fan Ali Tamayol Nasim Annabi Sheng Dai Jingxiu Bi Bo Jin Cory Xian Ali Khademhosseini Hu Zhang

Mimicking the zonal organization of native articular cartilage, which is essential for proper tissue functions, has remained a challenge. In this study, a thermoresponsive copolymer of chitosan-g-poly(N-isopropylacrylamide) (CS-g-PNIPAAm) was synthesized as a carrier of mesenchymal stem cells (MSCs) to provide a support for their proliferation and differentiation. Microengineered three-dimensio...

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