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RISS 인기검색어
- 검색키워드
- 저자 : Mehdi Rezaee (검색결과 4 건)
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Heterointerface effects in the electrointercalation of van der Waals heterostructures
Bediako, D. Kwabena,Rezaee, Mehdi,Yoo, Hyobin,Larson, Daniel T.,Zhao, S. Y. Frank,Taniguchi, Takashi,Watanabe, Kenji,Brower-Thomas, Tina L.,Kaxiras, Efthimios,Kim, Philip Nature Publishing Group UK 2018 Nature Vol.558 No.7710
Molecular-scale manipulation of electronic and ionic charge accumulation in materials is the backbone of electrochemical energy storage<SUP>1–4</SUP>. Layered van der Waals (vdW) crystals are a diverse family of materials into which mobile ions can electrochemically intercalate into the interlamellar gaps of the host atomic lattice<SUP>5,6</SUP>. The structural diversity of such materials enables the interfacial properties of composites to be optimized to improve ion intercalation for energy storage and electronic devices<SUP>7–12</SUP>. However, the ability of heterolayers to modify intercalation reactions, and their role at the atomic level, are yet to be elucidated. Here we demonstrate the electrointercalation of lithium at the level of individual atomic interfaces of dissimilar vdW layers. Electrochemical devices based on vdW heterostructures<SUP> 13</SUP> of stacked hexagonal boron nitride, graphene and molybdenum dichalcogenide (MoX<SUB>2</SUB>; X = S, Se) layers are constructed. We use transmission electron microscopy, in situ magnetoresistance and optical spectroscopy techniques, as well as low-temperature quantum magneto-oscillation measurements and ab initio calculations, to resolve the intermediate stages of lithium intercalation at heterointerfaces. The formation of vdW heterointerfaces between graphene and MoX<SUB>2</SUB> results in a more than tenfold greater accumulation of charge in MoX<SUB>2</SUB> when compared to MoX<SUB>2</SUB>/MoX<SUB>2</SUB> homointerfaces, while enforcing a more negative intercalation potential than that of bulk MoX<SUB>2</SUB> by at least 0.5 V. Beyond energy storage, our combined experimental and computational methodology for manipulating and characterizing the electrochemical behaviour of layered systems opens new pathways to control the charge density in two-dimensional electronic and optoelectronic devices.
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Mohammad Ramezani,Reza Kazemi Oskuee,Mehdi Rezaee,Leila Gholami,Mojtaba Seddighi Gildeh 한국약제학회 2019 Journal of Pharmaceutical Investigation Vol.49 No.1
With high potency in treatment of various diseases, gene therapy is mainly hindered by lack of safe and efficient gene delivery vectors. The current study was aimed to develop an efficient non-viral vector with adequate cytotoxicity. To this end, alkylcarboxylate chains (6C, 10C, 16C) were exploited to ameliorate the characteristics of PEI 750 kDa. Briefly, alkylcarboxylate chains with three different lengths (6C, 10C, 16C) were chemically grafted to the primary amine groups of PEI 750 kDa in three percentages (10, 50, and 100%). After evaluating the physicochemical properties of prepared vectors including surface charge, size, buffering capacity, and DNA condensing, their transfection efficiency and cytotoxicity were investigated in Neuro2A cells. The polyplexes size were 158.9–264.5 nm and their zeta potentials were 14–30 mV, while their buffering capacity and DNA condensing were not significantly decreased. The highest transfection efficiency in term of C/P ratio was observed in PEI750-10C-68%, PEI750-10C-7%, and PEI750-6C-7% at C/P ratios of 2, 4, and 6, respectively. Altogether, the decanoylcarboxylate-modified PEI with medium grafting percentages showed promising results as gene delivery vector. To sum up, the modification of high molecular weight PEIs by alkylcarboxylate chains is an efficient approach for development of more efficient non-viral vectors.
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Farideh Azimfar,Alireza Badiei,Seyed Mehdi Ghafelebashi,Majid Daftari-Besheli,Abbas Rezaee Shirin-Abadi 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.4
Three types of nanoporous silica support were modified by methylaluminoxane MAO and characterized by using BET, SEM, XRD and TGA. Dimethylsilyl (N-tert-butylamido)(tetramethylcyclopentadienyl) titanium dichlride was synthesized and immobilized on modified support. The prepared complex was then used as a reactive catalyst for ethylene polymerization. The effect of immobilization conditions on catalyst performance was studied. The results revealed elevated temperature grafting, decrease in precatalyst loading. Also, increasing of immobilization reaction time showed an increase in activity to 130 Kg poly/mol Ti.h.bar. The effects of polymerization temperature and [Al]/[Ti] ratio on the catalyst behavior, namely activity and bulk density, were investigated. According to the results, the activity of single-site catalyst depends on condition of immobilization and structure of nanoporous silica support.
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Zarrin Milad,Nakhostin Ansari Noureddin,Naghdi Soofia,Hasson Scott,Forogh Bijan,Rezaee Mehdi 사단법인약침학회 2023 Journal of Acupuncture & Meridian Studies Vol.16 No.5
Background: Dry needling (DN) is recommended as a therapeutic modality for various neuromusculoskeletal disorders. No study has been performed on the impact of DN on arthrogenic muscle inhibition (AMI) after anterior cruciate ligament reconstruction (ACLR). This study protocol is aimed to investigate the impacts of DN on AMI of quadriceps femoris, corticomotor, and spinal reflex excitability in patients with ACLR. Methods: A double-blind, between-subject, randomized, controlled trial will be conducted to measure changes in AMI after DN. Twenty-four subjects with ACLR will be recruited to receive a DN or a sham DN, providing that they met the inclusion criteria. Three sessions of DN on the quadriceps femoris will be applied during a one-week period. The primary outcome measures are the active motor threshold, motor evoked potential, and Hmax – Mmax ratio. The secondary outcomes are the International Knee Documentation Committee subjective knee form questionnaire score and maximum quadriceps isometric torque. Data will be collected at baseline, immediately after the first session, after the third session, and at the one-month follow-up visit. Discussion: The results of this study will provide preliminary evidence regarding the effects of DN on AMI of quadriceps femoris in patients with ACLR.
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