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Synthesis and Characterization of Zinc Oxide Films and Nanostructures

Thesis Info

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Author

Rabia Ahson

Program

PhD

Institute

Government College University

City

Lahore

Province

Punjab

Country

Pakistan

Thesis Completing Year

2019

Thesis Completion Status

Completed

Subject

Physics

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/12347/1/Rabia%20Ahson%20physics%202019%20gcu%20lhr%20prr.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676727467993

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Zinc oxide (ZnO) is a material of interest for extensive research due to its numerous beneficial properties and wide range of applications. In this work, thin films of ZnO have been deposited by rf magnetron sputtering. The effect of varying thickness on the structural properties of the films have been studied. The crystallinity shows improvement with increasing thickness. The surface morphology is granular for all films and roughness increases with increasing thickness. Nanorods of ZnO have been synthesized via hydrothermal route. It has been shown that the diameter of nanorods increases with increasing solution concentration and with increasing thickness of seed layer. However the diameter decreases with increasing roughness of the seed layers. The number density shows inverse behavior to that of diameter. The covered area and growth rates of nanorods were also estimated. Use of thick seed layers and higher solution concentration led to formation of film like array of nanorods covering almost the entire substrate surface. A new model has been proposed for the growth of ZnO nanorods. This model is based on the Avrami model and estimates the number density of nanorods as a function of solution concentration. To the best of the author’s knowledge, Avrami equations have not been modified for nanostructures in terms of solution concentration. Zinc Acetate, Sodium Dodecyl Sulfate and Trisodium Citrate have been used to modify the structure of nanorods. Each agent had a different influence on the structure evolution of ZnO nanostructures. The growth mechanism in the presence of these agents have been discussed in detail. Use of Sodium Dodecyl sulphate and Trisodium Citrate have shown potential for growth of continuous granular films via the simple and inexpensive hydrothermal method.
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المبحث الثالث: العيون الحزينة

المبحث الثالث: العيون الحزينة

قصيدة " إلی عيني الحزينتين " لنازک الملائكة[1]


عینيّ، أيّ أسیً یرین[2] علیکما
ویُثیر[3] في غسق[4] الدجی[5] دمعیکما؟

إني أری خلف الجفُون ضراعۃ[6]
تستنطق[7] الکون[8] العریض المبھما[9]

أفقان تحت اللیل ألمحُ فیھما
فطرات ضوءٍ یرتشفن[10] الأنجما

ألکونُ مبتسمُ فأیّۃُ لوعۃٍ[11]
یا مقلتيّ[12] تلوح[13] في جفنیکما؟

مسکینتانِ، رأیتما ما لا یَرَی
جیلٌ أقام علی الضلال[14]، وحوّما [15]

جھل الحقائق في الحیاۃ، فلم یُطق[16]
عن زیفھا ھرباً وعاش مھوما [17]

مسکینتان کتمتما حمم[18] الأسیٰ[19]
فأبی[20] تأوّہ[21] خافقي[22] أن تکتما

فاذا الدموع غشاوۃ[23] رفّت[24] علی
جفنیکما، ، سیلاً سخیناً مفعما[25]

ورأیتما، خَلَلَ الدّموعِ، مفاتن ال
ماضي وطاف الشوقُ فی أفقیکما

عبثاً تصوغان[26] التوسّل في الدجی،
قلبُ القضاء[27] قضی[28] بألا تَنعما

عبثاً ، فیا عینيّ لا تتضرّعا[29]
لا شيء، یرجعِ بالجمال إلیکما

حسبي[30] وحسبکما الرضوخُ[31] لما قضّی
قلب اللیالي فارضخا[32] واستسلیما

کم حالمٍ من قبلنا فقد المنّی

عہد صحابہ میں شمائلِ نبویﷺکا اسلوب بیان

All the companions (Shaba R.A.) would get the pleasure of feasting their eyes with the sight of prophet’s (S.A.W) appearance while being in his companionship for years. They would memorize the attained knowledge from prophet (S.A.W) and convey it to the audience with the paradigm of excellence in the personality of prophet (S.A.W). These aspects are discussed in books of Hadith and Seerat-e-Nabawi (S.A.W) as incidence, but are out of study of scholastic group. Hence, the one researching Seerat-e-Nabawi (S.A.W) cannot infer these contents. Many initial books on the physical description of Prophet (S.A.W) have partially focused on the limited aspects of physical description of Prophet (S.A.W) while a large number of these aspects could not be discussed and included. It was essential to primarily identify and include such worth- knowing but overlooked aspects of Prophet‘s physical description in the books of Hadith and Seerat.

War on Terror and the Law of Armed Conflict: Legal Aspects and Implications

The acts of terrorism committed by non-state actors on September 11, 2001 were promptly responded by the use of force against Afghanistan, thus, commencing the ‘war on terror.’ This thesis sets out the essential components of the international legal framework i.e. jus ad bellum and jus in bello against which the September 11 attacks and the lawfulness of measures taken in response, thereto, fall to be assessed. The main emphasis remains on relevant laws in relation to the responsibility for 9/11 terrorist attacks, lawful constraints on the use of force in self-defense, limitations on conduct of hostilities under the humanitarian principles and safeguards provided by law-enforcement paradigm to protect basic human rights. This study is, therefore, to highlight the existence of international legal regime capable of addressing the events such as September 11 and governing the responses to that. It enquires the compatibility of the ‘war on terror’ with the legal framework provided by international law especially the Law of Armed Conflict in order to find out the legitimacy of use of force in preemptive self-defense, conduct of military operations to prevent transnational terrorism, targeted killings, collateral damage, detention operations and prosecution procedures. It also refers to the implications for states responsible for noncompliance to the law and subsequently for international rule of law. In this regard, the study explores that interpretation of the law is significant that regulates the state-based rationale behind compliance or noncompliance to the law. If there is a state-will to focus on humanitarian protection of individuals then rationale is more related to the applicability of the law, and if a state uses its influence and powerful status to achieve political-military objectives then rationale is less concerned about the rule of law. This proposition constitutes the threshold of applicability of the law in the ‘war on terror'' and eventually leads to the conclusion that unilateral use of force to counter terrorism is not a viable solution rather it obscures international law as a legal framework in such military operations. This thesis, thus, maintains that the existing international norms and standards can only establish the rule of law, if states interpret the law in its simplest form, apply it regardless of their vested interests and pay due respect to international legal regime.