نتایج جستجو برای: nano cellulosic fibers

تعداد نتایج: 122842  

Journal: :international journal of nano dimension 0
a. kardam department of chemistry, faculty of science, dayalbagh educational institute, agra 282110, india. k. rohit raj department of chemistry, faculty of science, dayalbagh educational institute, agra 282110, india. sh. srivastava department of chemistry, faculty of science, dayalbagh educational institute, agra 282110, india.

the increased surface area-to-volume ratio of nanoparticles, quantum size effects and the ability to tune surface properties through molecular modification make nanostructures ideal for environmental remediation. the present piece of work reports the preparation and characterization of nano cellulosic fibers (ncfs) with further polymeric reinforcement using vinyl sulphonic acid for the remediat...

Journal: :جنگل و فرآورده های چوب 0
آیدا معزی پور کارشناس ارشد صنایع چوب و کاغذ، دانشکدة منابع طبیعی، دانشگاه تهران، کرج، ایران محمد لایقی استادیار گروه علوم و صنایع چوب و کاغذ، دانشکدة منابع طبیعی، دانشگاه تهران، کرج، ایران قنبر ابراهیمی استاد گروه علوم و صنایع چوب و کاغذ، دانشکدة منابع طبیعی، دانشگاه تهران، کرج، ایران بابک اکبری کارشناس بخش تحقیقات شرکت ساپکو (طراحی مهندسی و تأمین قطعات ایران خودرو)، تهران، ایران

in the present study, development of new asbestos-free brake pad using lingo-cellulosic fibers and nano aluminum oxide particles was investigated. variable factors were the type of lignocellulosic materials (jute, bagass and rice husk) and the size of aluminum particles (nano and micron). these newly formulated brake pads have been tested under the grey cast iron disc. friction coefficient and ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت مدرس - دانشکده علوم پایه 1388

در سالهای اخیر تلاش زیادی برای سنتز کمپلکس های سوپرامولکول و پلیمرهای کوئوردیناسیونی بر مبنای لیگاندهای آلی چند دندانه شده است. این مواد به دلیل داشتن خواص منحصر به فرد، کاربردهای زیادی در صنعت دارند. سنتز پلیمرهای کوئوردیناسیونی جدید از سرب(ii) در ابعاد بالک(توده) و نانو با استفاده از روش گرادیان دمایی و به روش شاخه جانبی صورت گرفته و با روش طیف سنجی ir و پایداری گرمایی آن ها توسط آنالیزهای وز...

2011
Jinshu Shi Sheldon Q. Shi H. Michael Barnes Charles U. Pittman

The objective of this research was to evaluate an all-chemical process to prepare nano-scale to macro-scale cellulosic fibers from kenaf bast fibers, for polymer composite reinforcement. The procedure used in this all-chemical process included alkaline retting to obtain single cellulosic retted fiber, bleaching treatment to obtain delignified bleached fiber, and acidic hydrolysis to obtain both...

2014
Sangyeob Lee Hui Pan Chung Y Hse Alfred R Gunasekaran Todd F Shupe

The effects of aqueous solutions were evaluated on the properties of regenerated cellulosic nanofibers prepared from pure cellulose fibers in various formulations of aqueous solutions. Thermoplastic composites were prepared with reinforcement of the regenerated cellulosic nanofibers. The regenerated cellulosic fibers from cellulosic woody biomass were obtained from dissolved cellulose solutions...

2016
R. Pavithra

In this study, we solely focused on the isolation of nano cellulose from the teak wood by adopting pulping and acid hydrolysis. Top down method is carried out in the extraction of Cellulosic nano fibrils. The removal of non-cellulosic constituents is monitored by FTIR-ATR and UV-Vis DRS Spectroscopic techniques throughout the isolation process. The acidic hydrolysis is applied to extract the na...

2009
Balamurali Balu Jong Suk Kim Victor Breedveld Dennis W. Hess

We report the fabrication of a sticky superhydrophobic paper surface with extremely high contact angle hysteresis: advancing contact angle ∼150◦ (superhydrophobic) and receding contact angle ∼10◦ (superhydrophilic). In addition, we report the controlled tunability of the contact angle hysteresis from 149.8 ± 5.8◦ to 3.5 ± 1.1◦, while maintaining superhydrophobicity, as defined through an advanc...

Journal: :Carbohydrate Polymers 2021

Cellulosic nanomaterials are in the focus of academia and industry to realize light-weight biobased materials with remarkable strength. While effect is well known, distribution these less explored, particularly for paper sheets. Here, we explore 3D micro nanosized cellulosic particles sheets correlate their extent fibrillation inside subsequently properties. To overcome challenges contrast betw...

2016
Jiulong Xie Chung-Yun Hse Chunjie Li Todd F. Shupe Tingxing Hu Jinqiu Qi Cornelis F. De Hoop

Bamboo raw feedstocks with large particle size (20−80 mesh) were subjected to a microwave liquefaction system, and the liquefied products were separated into biopolyols and liquefied residues. Biopolyols were first analyzed by gas chromatography mass spectrometry (GC−MS), and the main components were sugar derivatives with 2−4 hydroxyl groups and phenolic compounds derived from lignin. The resi...

2010
Qingzheng Cheng Jingxin Wang Joseph F. McNeel Peter M. Jacobson

A centrifugal method has been modified and applied to the assessment of water retention value (WRV) in cellulosic materials. Microcrystalline cellulose (MCC), small particles/fibrils isolated from MCC using highpressure homogenizer, and pulp fibers saturated in water were centrifuged at different speeds and times with filter paper and/or a membrane acting as the filter in the WRV measurement se...

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