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Article
Novel method for visualizing of the coated microbubbles using the electron microscopy

Authors: Aladdin Majeed Hasson --- Bassam T. mohammad --- Mazin K. Hamid --- Abdul k. Hussein Dagher
Journal: Mustansiriya Medical Journal مجلة المستنصرية الطبية ISSN: 20701128 22274081 Year: 2016 Volume: 15 Issue: 2 Pages: 75-78
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

The microbubbles have many important acoustics applications, some of these applications are in medical uses such as ultrasound contrast agents and drug delivery. The efficiency and stability of the microbubbles are depending on many factors one of them is the structure of their shells. There is a significant need to visualize this structure to understand and optimize the bubbles behavior. Direct observation such scanning electron microscopy (SEM) and transmission electron microscopy (TEM) pose a big technical challenge because of the vacuum environment required by these devices. In addition, the freeze-fracture technique with TEM is long and expensive. In the present study, a novel modified method was used to overcome these challenges and consider a simple,


Article
The effects of laser intensities on nonlinear propertiesfor Ag nanoparticles colloid
تأثيرات شدات الليزر على الصفات اللاخطية لعالق الفضة النانوية

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Abstract

A huge potential from researchers was presented for enhancing the nonlinear optical response for materials that interacts by light. In this work, we study the nonlinear optical response for chemically prepared nano- fluid of silver nanoparticles in de-ionized water with TSC(Tri-sodium citrate) protecting agent. By the means of self-defocusing technique and under CW 473 nm blue laser, the reflected diffraction pattern were observed and recorded by CCD camera. The results demonstrate that, the Ag nano-fluid shows a good third order nonlinear response and the magnitude of the nonlinear refractive index was in the order of 10−7 cm2/W. We determine the maximum change of the nonlinear refractive index and the related phase shift for the material at six input laser intensities.

تم بذل مجهود كبير من قبل الباحثين لغرض تحسين الاستجابة البصرية اللاخطية للمواد التي تتفاعل مع الضوء. وفي هذا العمل تم دراسة الاستجابة البصرية اللاخطية للعالق النانوي المحضر كيميائيا لجسمات الفضة النانوية في الماء منزوع الايونات مع وجود عامل الحماية TSC باستخدام تقنية التشتت الذاتي وتحت موجة مستمرة من الليزر الازرقبطول موجي 473 نانومتر, ان انماط الحيود المنعكسة تم ملاحظتها وتسـجيلها باستخدام الكاميرا. لقد اثبتــت النتائج ان عالق الفضة النانوي اظهر استجابة لاخطية جيدة ومن المرتبة الثالثة وان قيمة معامل الانكســـــار اللاخطي كان بالرتبة 10−7 cm2/W لقد قمنا بحساب مقدار التغير الاكبر وفرق الطور الناتج عنه للمادة تحت تأثير ست قراءات لشدة الليزر.

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