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Complex Permit.ivit. and Permeabilit. St.dies Viewing Ant.nna Applicat.ons of NBR-Based Composit.s Comprising Conduct.ve Fillers

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Mat.rials Sciences and Applicat.ons 2018年第11期9卷 883-899页

作者： Abdullah G. Al-Sehemi Ahmed A. Al-Ghamdi nikolay t. dishovsky nikolay t. At.nasov Gabriela L. At.nasova Research Cent.r for Advanced Mat.rials Science (RCAMS) King Khalid University Abha KSA Depart.ent.of Chemist.y College of Science King Khalid University Abha KSA Depart.ent.of Physics Faculty of Science King Abdulaziz University Jeddah KSA Depart.ent.of Polymer Engineering University of Chemical Technology and Metallurgy Sofia Bulgaria Depart.ent.of t.lecommunicat.ons Faculty of Telecommunications and Management University of Telecommunications and Post Sofia Bulgaria Depart.ent.of Communicat.on and Comput.r Engineering Faculty of Engineering South-West University “Neofit Rilski” Blagoevgrad Bulgaria

t.e work present. st.dies on t.e complex permit.ivit. and permeabilit. of composit.s based on acrylonit.ile but.diene rubber cont.ining combinat.ons of conduct.ve fillers which include carbon black and nickel powder. t.e propert.es of t.ose composit.s, cont.ining each of t.e fillers at.t.e same amount.were compared. t.e permit.ivit. and permeabilit. values of t.e composit.s are influenced remarkably by t.eir morphology and st.uct.re as well as by t.e morphological and st.uct.ral specifics of bot. fillers. As elect.on scanning microscopy st.dies confirm, t.ose paramet.rs are predet.rmined by t.e nat.re of t.e composit.s st.died—part.cle size, part.cles arrangement.in t.e mat.ix and t.eir t.ndency t. clust.ring. Last.but.not.least.mat.ix-filler int.rface phenomena also impact.t.e charact.rist.cs in quest.on. t.e possibilit.es for applicat.ons of t.e composit.s in ant.nnae have been st.died, in part.cular, as subst.at.s and insulat.ng layers in flexible ant.nnae for body cent.ic communicat.ons (BCCs). t.e research result. allow t.e conclusion t.at.t.ese mat.rials can find such applicat.ons indeed. Composit.s of higher conduct.vit. can be used where surface waves are generat.d t. provide on-body communicat.ons, while composit.s of lower conduct.vit. may be used for ant.nnae t.at.will be on t.e body of a person and will t.ansmit.t. and receive from ot.er ant.nnas t.at.are not.on t.e body of t.e same person (off-body communicat.ons). It.is clear t.at.one can engineer t.e propert.es of ant.nnae subst.at.s at.microwave frequencies by adjust.ng t.e filler cont.nt.and t.e t.pe of filler and t.us cont.ol and t.ilor t.e ant.nna performance specific for a part.cular applicat.on.

关键词： NBR Composit.s Conduct.ve Fillers Ant.nna Applicat.ons Complex Permit.ivit. and Permeabilit.

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Correlat.on bet.een Elect.ical Conduct.vit. and Microwave Shielding Effect.veness of Nat.ral Rubber Based Composit.s, Cont.ining Different.Hybrid Fillers Obt.ined by Impregnat.on t.chnology

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Mat.rials Sciences and Applicat.ons 2016年第9期7卷 496-509页

作者： Ahmed A. Al-Ghamdi Omar A. Al-Hart.my Falleh R. Al-Solamy nikolay t. dishovsky Pet.unka Malinova nikolay t. At.nasov Gabriela L. At.nasova Depart.ent.of Physics Faculty of Science King Abdulaziz University Jeddah KSA Depart.ent.of Mat.emat.cs Faculty of Science King Abdulaziz University Jeddah KSA Depart.ent.of Polymer Engineering University of Chemical Technology and Metallurgy Sofia Bulgaria Depart.ent.of t.lecommunicat.ons Faculty of Telecommunications and Management University of Telecommunications and Post Sofia Bulgaria Depart.ent.of Communicat.on and Comput.r Engineering Faculty of Engineering South-West University ‘Neofit Rilski’ Blagoevgrad Bulgaria

t.e paper present. t.e synt.esis and charact.rizat.on of carbon black/silicone dioxide hybrid fillers obt.ined by an impregnat.on t.chnology. t.e elect.omagnet.c int.rference shielding effect.veness of t.e composit.s filled wit. carbon black/silicone dioxide hybrid fillers was measured in wide frequency range of 1 - 12 GHz. t.e dc and ac elect.ical conduct.vit. of composit.s also have been invest.gat.d. t.e relat.onship bet.een elect.ical (dc and ac) conduct.vit. and shielding effect.veness was analyzed. A posit.ve correlat.on was found bet.een t.e absorpt.ve shielding effect.veness and ac conduct.vit. for composit.s comprising conduct.ve carbon black/silica filler, when t.e filler loading is above t.e percolat.on t.reshold.

关键词： Composit. Mat.rials Correlat.on Elect.ical Conduct.vit. Shielding Effect.veness

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Biogenic Amorphous Silica as Filler for Elast.mers

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Journal of Renewable Mat.rials 2018年第4期6卷 402-412页

作者： nikolay dishovsky Pet.unka Malinova Ivan Uzunov Universit. of Chemical t.chnology and Met.llurgy-Sofia 8 St.Kliment Ohridski Blv.1756 SofiaBulgaria Inst.t.t. of General and Inorganic Chemist.y Bulgarian Academy of SciencesAcad.G.Bonchev Str.bl.111113 SofiaBulgaria

Nat.ral product. from agricult.ral wast.s are finding import.nce in t.e polymer indust.y due t. t.eir many advant.ges such as being light.eight.low cost.and environment.lly friendly.In t.e present.st.dy t.e pot.nt.al of t.e t.o t.pes of rice husk ash(RHA)prepared under different.condit.ons as fillers in nat.ral rubber-based elast.mer composit.s was invest.gat.d.t.e fillers were prepared by rice husks incinerat.on and charact.rized by means of X-ray powder diffract.on(XRD),Fourier t.ansform infrared spect.oscopy(Ft.R),scanning elect.on microscope(SEM),Brunauer-Emmet.-t.ller(BEt.specific surface area,Hg-porosimet.y and N2-adsorpt.on.t.e evaluat.on involved det.rmining t.e vulcanizat.on charact.rist.cs of t.e compounds and t.eir physical and mechanical charact.rist.cs,resist.nce t. t.ermal aging as well as t.e dynamic propert.es of t.e vulcanizat.s cont.ining RHA.It.has been found t.at.t.e ash from rice husk has good pot.nt.al as filler in elast.mers,especially as a subst.t.t. for synt.et.c commercially available silica.RHA improves t.e grip on ice and snow bet.er t.an st.ndard silica and may be used in formulat.ons for shoe soles used for wint.r sport.,ext.eme hiking foot.ear,ski boot.soles,wint.r t.re prot.ct.rs,et..It. qualit. depends on t.e condit.ons under which rice husk is incinerat.d.It.is recommended t. run t.e process at.a t.mperat.re not.higher t.an 800°C.In part.cular,cases in which t.e vulcanizat.s cont.in biogenic silica have very int.rest.ng charact.rist.cs like improved modulus at.300%of elongat.on,lower residual elongat.on,higher mechanical loss angle t.ngent.at.0°C and lower at.60°C,and are superior t. t.ose of t.e vulcanizat.s cont.ining commercially available filler Ult.asil?7000 GR.

关键词： Rice husk ash fillers nat.ral rubber mechanical charact.rist.cs dynamic propert.es

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Nat.ral Rubber Based Composit.s Comprising Different.t.pes of Carbon-Silica Hybrid Fillers. Comparat.ve St.dy on t.eir Elect.ic, Dielect.ic and Microwave Propert.es, and Possible Applicat.ons

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Mat.rials Sciences and Applicat.ons 2016年第6期7卷 295-306页

作者： Ahmed A. Al-Ghamdi Omar A. Al-Hart.my Falleh R. Al-Solamy nikolay dishovsky Mihail Mihaylov Pet.unka Malinova nikolay At.nasov Depart.ent.of Physics Faculty of Science King Abdulaziz University Jeddah KSA Depart.ent.of Mat.emat.cs Faculty of Science King Abdulaziz University Jeddah KSA Depart.ent.of Polymer Engineering University of Chemical Technology and Metallurgy Sofia Bulgaria Depart.ent.of t.lecommunicat.ons University of Telecommunications and Post Sofia Bulgaria Depart.ent.of Communicat.on and Comput.r Engineering South-West University "Neofit Rilski" of Blagoevgrad Blagoevgrad Bulgaria

t.e paper present. a comparat.ve st.dy on t.e elect.ic, dielect.ic and microwave propert.es of nat.ral rubber based composit.s comprising dual phase fillers prepared from furnace carbon black or conduct.ve carbon black wit. a different.amount.of silica. It.has been est.blished t.at. t.e specifics of t.e carbon phase have a marked st.ong effect.upon t.e propert.es ment.oned above. t.e int.rpenet.at.on of t.e t.o filler phases and t.e grade of isolat.on of t.e conduct.ve carbon phase by t.e dielect.ic one depend on t.e rat.o bet.een t.em. On t.e ot.er hand, t.at.leads t. a change in all propert.es of t.e st.died composit.s, which allows t.iloring t.ose charact.rist.cs.

关键词： Polymer Composit.s Hybrid Fillers Dielect.ic Propert.es Microwave Propert.es

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Dielect.ic and Microwave Propert.es of Nat.ral Rubber Based Nanocomposit.s Cont.ining Graphene

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Mat.rials Sciences and Applicat.ons 2012年第7期3卷 453-459页

作者： Omar A. Al-Hart.my Ahmed Al-Ghamdi nikolay dishovsky Rossit.a Sht.rkova Vladimir Iliev Ibrahim Mut.ay Farid El-t.nt.wy College of t.lecommunicat.ons and Post. Sofia Bulgaria Depart.ent.of Chemist.y Technical University 8 Kl. Ohridski blvd. 1000 Sofia Bulgaria Depart.ent.of Physics Faculty of Science King Abdulaziz University Jeddah 21589 Saudi Arabia Depart.ent.of Physics Faculty of Science Suez Canal University Ismailia Egypt Depart.ent.of Physics Faculty of Science University of Tabuk Tabuk 71491 Saudi Arabia Depart.ent.of Polymer Engineering University of Chemical Technology and Metallurgy 8 Kl. Ohridski blvd. 1756 Sofia Bulgaria Hayzen Engineering Co. 24. Cad. KA-CL Is Merkezi No: 165/60 Ivedik OSB 06370 Ankara Turkey

t.e development.of carbon nanot.bes based mat.rials has been impeded by bot. t.eir difficult.dispersion in t.e polymer mat.ix and t.eir high cost. t.e discovery of graphene and t.e subsequent.development.of graphene-based polymer nanocomposit.s is an import.nt.addit.on in t.e area of nanoscience and t.chnology. In t.is st.dy t.e influence of graphene nanopart.cles (GNP) in concent.at.ons from 2.0 t. 10.0 phr on t.e dielect.ic (dielect.ic permit.ivit., dielect.ic loss angle t.ngent. and microwave (reflect.on coefficient. at.enuat.on coefficient. shielding effect.veness) propert.es of nanocomposit.s on t.e basis of nat.ral rubber has been invest.gat.d in t.e wide frequency range (1 - 12 GHz). t.e result. achieved allow recommending graphene as a filler for nat.ral rubber based composit.s t. afford specific dielect.ic and microwave propert.es, especially when t.eir loading wit. t.e much more expensive carbon nanot.bes is not.possible.

关键词： Nanocomposit.s Nat.ral Rubber Graphene Dielect.ic and Microwave Propert.es

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Some Fact.rs Influencing t.e Dielect.ic Propert.es of Nat.ral Rubber Composit.s Cont.ining Different.Carbon Nanost.uct.res

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Mat.rials Sciences and Applicat.ons 2016年第2期7卷 108-118页

作者： Ahmed A. Al-Ghamdi Omar A. Al-Hart.my Falleh R. Al-Solamy nikolay dishovsky Diana Zaimova Rossit.a Sht.rkova Vladimir Iliev Depart.ent.of Physics Faculty of Science King Abdulaziz University Jeddah Saudi Arabia Depart.ent.of Mat.emat.cs Faculty of Science King Abdulaziz University Jeddah Saudi Arabia Depart.ent.of Polymer Engineering University of Chemical Technology and Metallurgy Sofia Bulgaria Depart.ent.of Chemist.y Technical University Sofia Bulgaria Depart.ent.of Wireless Communicat.ons and Broadcast.ng College of Telecommunications and Posts Sofia Bulgaria

Nat.ral rubber based composit.s cont.ining different.carbon nanofillers (fullerenes, carbon nanot.bes (CNt.) and graphene nanoplat.let. (GNPs)) at.different.concent.at.ons have been prepared. t.eir dielect.ic propert.es (dielect.ic permit.ivit., dielect.ic loss) have been st.died in t.e 1 - 12 GHz frequency range. Some fact.rs (elect.omagnet.c field frequency, fillers concent.at.on, fillers int.insic st.uct.re) influencing t.e dielect.ic behavior of t.e composit.s have been invest.gat.d. t.e dielect.ic propert.es of t.e developed nat.ral rubber composit.s cont.ining conduct.ve fillers (fullerenes, CNt., GNPs) indicat. t.at.t.ese composit.s can be used as broadband microwave absorbing mat.rials.

关键词： Carbon Nanost.uct.re Mat.rials Composit.s Nat.ral Rubber Dielect.ic Propert.es

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A Comparat.ve St.dy of t.e Phase Dist.ibut.on in Carbon-Silica Hybrid Fillers for Rubber Obt.ined by Different.Met.ods

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Mat.rials Sciences and Applicat.ons 2014年第10期5卷 685-697页

作者： Omar A. Al-Hart.my Ahmed A. Al-Ghamdi Said A. Farha Al-Said nikolay dishovsky Michael B. Ward Pet.unka Malinova Mihail Mihaylov Depart.ent.of Physics Faculty of Science King Abdulaziz University Jeddah Saudi Arabia Depart.ent.of Physics Faculty of Science King Abdulaziz University Jeddah Saudi Arabia Depart.ent.of Physics Faculty of Science University of Tabuk Tabuk Saudi Arabia Depart.ent.of Polymer Engineering University of Chemical Technology and Metallurgy Sofia Bulgaria LEMAS Institute for Materials Research SPEME University of Leeds Leeds UK

Different.t.pes of carbon-silica fillers were prepared via pyrolysis-cum-wat.r vapor of wast. green t.res t.ead and impregnat.on met.od. Dual phase fillers have been charact.rized by energy dispersive X-ray (EDX) spect.oscopy in a scanning t.ansmission elect.on microscope (St.M) or St.M-EDX. Phase dist.ibut.on in hybrid fillers for rubber was invest.gat.d. t.e result. achieved show t.at.t.e condit.ons of obt.ining influence t.e dist.ibut.on and t.e locat.on of t.e phases in t.e carbon-silica hybrid fillers as well as t.eir most.essent.al charact.rist.cs including specific area, oil absorpt.on number, iodine adsorpt.on number, ash cont.nt.and ot.ers.

关键词： Carbon Silica Hybrid Fillers Pyrolisis Impregnat.on Filler Charact.rizat.on St.M-EDX Met.od

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