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Emerging applications of nanomaterials in chemical enhanced oil recovery:Progress and perspective

Chinese Journal of Chemical Engineering 2020年第8期28卷 1995-2009页

作者： Najeebullah Lashari Tarek Ganat Department of Petroleum Engineering Universiti Teknologi PETRONAS32610 Seri IskandarPerak Darul RidzuanMalaysia Department of Petroleum and Gas Engineering Dawood University of Engineering&TechnologyM.A Jinnah RoadKarachi-74800Pakistan

In enhanced oil recovery,different chemicalmethods utilization improves hydrocarbon recovery due to their fascinating abilities to alter some critical parameters in porous media,such as mobility control,the interaction between fluid to fluid,and fluid to rock surface.For decades the use of surfactant and polymer flooding has been used as tertiary recovery methods.In the current research,the inclusion of nanomaterials in enhanced oil recovery injection fluids solely or in the presence of other chemicals has got colossal interest.The emphasis of this review is on the applicability of nanofluids in the chemical enhanced oil recovery.The responsiblemechanisms are an increment in the viscosity of injection fluid,decrement in oil viscosity,reduction in interfacial and surface tension,and alteration of wettability in the rock formation.In this review,important parameters are presented,which may affect the desired behavior of nanoparticles,and the drawbacks of nanofluid and polymer flooding and the need for a combination of nanoparticles with the polymer are discussed.Due to the lack of literature in defining the mechanism of nanofluid in a reservoir,this paper covers majorly all the previous work done on the application of nanoparticles in chemical enhanced oil recovery at home conditions.Finally,the problems associatedwith the nano-enhanced oil recovery are outlined,and the research gap is identified,which must be addressed to implement polymeric nanofluids in chemical enhanced oil recovery.

关键词： Chemical enhanced oil recovery Mechanisms Nanoparticles polymeric Nanofluids

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Poly(1-vinylimidazole) Prospects in Gene Delivery

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Chinese Journal of Polymer Science 2019年第7期37卷 637-645页

作者： Elena N.Danilovtseva Stanislav N.Zelinskiy Viktor A.Pal'shin Gayathri Kandasamy Uma Maheswari Krishnan Vadim V.Annenkov Limnological Institute of the Siberian Branch of the Russian Academy of Sciences 3Ulan-Batorskaya St.P.O. Box 278Irkutsk 664033Russia Centre for Nanotechnology &Advanced Biomaterials (CeNTAB) School of Chemical and BiotechnologySASTRA UniversityThanjavur 613401 Tamil NaduIndia

polymeric amines are being studied intensively as components of systems for gene delivery in genetic engineering and gene therapy of genetic disorders, including cancer. Despite remarkable achievements in the field, polymeric amines, such as polyethyleneimine, show some disadvantages. Strong interaction between the amine-containing polymer and nucleic acid hampers the release of nucleic acid in the cell cytoplasm. Amine groups can interact with the cell membrane which results in cell death. These limitations of polymeric amines stimulated an investigation of new structures for gene delivery. Imidazole-containing polymers have attracted attention as lesser basic substances, while they are able to interact with polymeric acids. Further development of imidazole-based gene delivery agents requires knowledge about some fundamental aspects of interaction between nucleic acids, and polymeric imidazoles. In this work, we studied the complexation of poly(1-vinylimidazole) and oligomeric DNA. We found that the number of active sites capable of binding with negatively charged phosphate groups is comparable with the number of protonated imidazole units in the case of high molecular weight polymer. The increase in polymer charge by 1-bromopropane quaternizating 1%?5% imidazole units or by decreasing the pH to 6.5?7 considerably increased the ability of poly(1-vinylimidazole) to interact with oligonucleotides. The pH sensitivity of this interaction is interesting for cancer gene therapy because the tumours have a lowered intercellular pH (stable oligonucleotide complex) and a higher extracellular pH which can lead to complex dissociation. Minimal critical length for complexation of quaternized poly(1-vinylimidazole) and DNA is below eight units which corresponds to polymers with amine groups. Fluorescence-tagged poly(1-vinylimidazole) samples were obtained and their potential for monitoring the polymer and polymer-oligonucleotide complex internalization into living cells was demonstrated.

关键词： polymeric amines Oligonucleotides Fluorescence Poly(1-vinylimidazole) Gene delivery

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Design, mechanism, delivery and therapeutics of canonical and Dicer-substrate siRNA

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Asian Journal of Pharmaceutical Sciences 2019年第5期14卷 497-510页

作者： Maria Abdul Ghafoor Raja Haliza Katas Muhammad Wahab Amjad Department of Pharmaceutics Faculty of PharmacyNorthern Border UniversityRafha73211Saudi Arabia Centre for Drug Delivery Research Faculty of PharmacyUniversiti Kebangsaan MalaysiaKuala Lumpur50300Malaysia

Upon the discovery of RNA interference(RNAi),canonical small interfering RNA(si RNA) has been recognized to trigger sequence-specific gene silencing. Despite the benefits of si RNAs as potential new drugs,there are obstacles still to be overcome,including off-target effects and immune stimulation. More recently,Dicer substrate si RNA(Dsi RNA) has been introduced as an alternative to si RNA. Similarly,it also is proving to be potent and target-specific,while rendering less immune stimulation. Dsi RNA is 25–30 nucleotides in length,and is further cleaved and processed by the Dicer enzyme. As with si RNA,it is crucial to design and develop a stable,safe,and efficient system for the delivery of Dsi RNA into the cytoplasm of targeted cells. Several polymeric nanoparticle systems have been well established to load Dsi RNA for in vitro and in vivo delivery,thereby overcoming a major hurdle in the therapeutic uses of Dsi RNA. The present review focuses on a comparison of si RNA and Dsi RNA on the basis of their design,mechanism,in vitro and in vivo delivery,and therapeutics.

关键词： RNA interference Drug delivery system polymeric nanoparticles Gene silencing Gene carrier Non-viral vector

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Two-photon AIE probe conjugated theranostic nanoparticles for tumor bioimaging and pH-sensitive drug delivery

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Nano Research 2019年第7期12卷 1703-1712页

作者： Boxuan Ma Weihua Zhuang Haiyang He Xin Su Tao Yu Jun Hu Li Yang Gaocan Li Yunbing Wang National Engineering Research Center for Biomaterials Sichuan UniversityChengdu 610064China

Nanoparticles armed with chemotherapy drug and fluorescence probe have become an effective anticancer strategy for their advantages in cancer diagnosis and treatment.However,fluorophore for diagnostic medicine with deep penetration depth and high resolution are still very rare,while rational designs are also required to improve the tumor retention and target-site drug delivery.Herein,a two-photon fluorophore with aggregation-induced emission and large two-photon absorption cross-section has been designed for two-photon bioimaging,and a novel theranostic nanoplatform is also constructed based on doxorubicin and the two-photon fluorophore conjugated copolymer,P(TPMA-co-AEMA)-PEI(DA)-Blink-PEG (PAEEBlink-DA).The micelles maintain a “stealth” property during blood circulation and is activated in the acidic tumor microenvironment,which triggers the charge-conversion and results in enhanced micellar internalization.Meanwhile,PAEMA chains can convert from hydrophobicity to hydrophilicity with accelerated drug release and particle size expansion.The enlarged particle size would potentially extend the retention time of these micelles.Moreover,a great AIE active two-photon bioimaging with tissue penetration depth up to 150 μm is observed and the in vivo biodistribution of nanoparticles can be traced.The in vivo antitumor results further indicate the obvious reduction of adverse effect and enhanced treatment effect of these micelles,proving that these PAEEBlink-DA micelles would be a potential candidate for tumor theranostic applications.

关键词： polymeric micelle two-photon aggregation-induced emission pH-sensitive charge conversion tumor retention

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Preparation and characterization of nanoparticles from quaternized cyclodextrin-grafted chitosan associated with hyaluronic acid for cosmetics

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Asian Journal of Pharmaceutical Sciences 2018年第5期13卷 498-504页

作者： Sakhiran Sakulwech Nattaya Lourith Uracha Ruktanonchai Mayuree Kanlayavattanakul School of Cosmetic Science Mae Fah Luang University Phytocosmetics and Cosmeceuticals Research Group Mae Fah Luang University National Nanotechnology Center National Science and Technology Development Agency

Hyaluronic acid(HA, 20–50 kDa) is a hydrophilic macromolecule with anti-wrinkle effects and moisturizing properties. However, its high molecular weight prevents it from penetrating into the deeper layers of the skin and, thus, limits its benefits to topical effects. Thus, the objective of this study is to prepare nanoparticles of quaternized cyclodextrin-grafted chitosan(QCD-g-CS) associated with HA in different molar ratios of QCD-g-CS and HA. The conjugation of the carboxylic moieties of HA and the amides of QCD-g-CS was confirmed by Fourier-transform infrared spectroscopy. Thus, the system was optimized to create nanoparticles with a small size(235.63 ± 21.89 nm), narrow polydispersity index(0.13 ± 0.02), and zeta potential of 16.07 ± 0.65 m V. The association efficiency and loading efficiency were determined by ultra-performance liquid chromatography as 86.77 ± 0.69% and 10.85 ± 0.09%, respectively. The spherical morphology of the obtained nanoparticles was confirmed by transmission electron microscopy. Moreover, the in-vitro hydrating ability was significantly higher( P < 0.001) than that of bulk HA(3.29 ± 0.41 and 1.71 ± 0.05 g water/g sample, respectively). The safety of these nanoparticles at concentrations in the range of 0.01–0.10 mg/ml was confirmed via tests on human skin fibroblasts. Together, these results demonstrate that the developed nanoparticles are promising for future applications in cosmetics.

关键词： Hyaluronic acid QCD-g-CS polymeric nanoparticles Ionic gelation Delivery system

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Perspective of mixed matrix membranes for carbon capture

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Frontiers of Chemical Science and Engineering 2020年第3期14卷 460-469页

作者： Shinji Kanehashi Colin AScholes Graduate School of Engineering Tokyo University of Agriculture and TechnologyTokyo184-8588Japan Peter Cook Centre for Carbon Capture and Storage Research Department of Chemical EngineeringThe University of MelbourneMelbourne 3010Australia

polymeric membrane-based gas separation has found wide applications in industry,such as carbon capture,hydrogen recovery,natural gas sweetening,as well as oxygen enrichment.Commercial gas separation membranes are required to have high gas permeability and selectivity,while being cost-effective to process.Mixed matrix membranes(MMMs)have a composite structure that consists of polymers and fillers,therefore featuring the advantages of both materials.Much effort has been made to improve the gas separation performance of MMMs as well as general membrane properties,such as mechanical strength and thermal stability.This perspective describes potential use of MMMs for carbon capture applications,explores their limitations in fabrication and methods to overcome them,and addresses their performance under industry gas conditions.

关键词： membranes polymeric mixed matrix impurities

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Spectroscopy of a Gamma Irradiated Poly(Acrylic Acid)-Clotrimazole System

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Chinese Physics Letters 2011年第12期28卷 274-277页

作者： M.Todica C.V.Pop Luciana Udrescu Traian Stefan Faculty of Physics Babes-Bolyai University400084 Cluj-NapocaRomania

A poly(acrylic acid)-clotrimazole system,gamma irradiated at different doses,is investigated by Raman spectroscopy.Modifications of the spectrum of the polymeric matrix appear for doses of radiation greater than 333 Gy,whereas the spectrum of clotrimazole remains unaffected at these doses of radiation.These changes correlate with modification of the vibration modes of COOH and CH_(2) groups of a polymeric matrix after irradiation.

关键词： spectroscopy polymeric matrix

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Polymer-based membranes for solvent-resistant nanofiltration:A review

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Chinese Journal of Chemical Engineering 2017年第11期25卷 1653-1675页

作者： Slow Kee Lira Kunli Goh Tae-Hyun Bae Rong Wang Singapore Membrane Technology Center Nanyang Environment and WaterResearch InstituteNanyang Technological UniversityI Cleantech Loop637141 SingaporeSingapore Nanyang Environment and Water Research Institute Interdisciplinary Graduate SchoolNanyang Technological University637141 SingaporeSingapore School of Chemical and Biomedical Engineenng Nanyang Technological University62 Nanyang Drive637459 SingaporeSingapore School of Civil and Environmental Engineering Nanyang Technological University50 NanyangAvenue639798 SingaporeSingapore

Separation of organic mixture is an inevitable process in most modern industrial processes. In the quest for a more sustainable and efficient separation, solvent-resistant nanofiltration(SRNF) has emerged as a promising answer. This is because SRNF is a membrane-based process which offers the key advantages of high efficacy and low energy intensity separation. In particular, polymer-based membranes can offer compelling opportunities for SRNF with unprecedented cost-effectiveness. As a result, intensive research efforts have been devoted into developing novel polymer-based membranes with solvent-resistant capacities as well as exploring potential applications in different types of industries. In this review, we aim to give an overview of the recent progress in the development of the state-of-the-art polymer-based membranes for SRNF in the first section. Emerging nanomaterials for mixed matrix and thin film nanocomposite membranes are also covered in this section. This is followed by a discussion on the current status of membrane engineering and SRNF membrane commercialization. In the third section, we highlight recent efforts in adopting SRNF for relevant industrial applications such as food, bio-refinery, petrochemical, fine chemical and pharmaceutical industries followed by separations of enantiomers in stereochemistry, homogeneous catalysis and ionic liquids. Finally, we offer a perspective and provide deeper insights to help shape future research direction in this very important field of SRNF.

关键词： Nanonltration Solvent-resistant polymeric membranes Nanomaterials Crosslinking Industrial applications

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Composite insulators and their aging: An overview

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Science China(Technological Sciences) 2007年第6期50卷 697-713页

作者： Muhammad AMIN Muhammad AKBAR Muhammad SALMAN University of Engineering and Technology

The aging (biological deterioration) is a major problem of composite insulators now-a-days. The main thing in aging is to predict how, when and with what speed it occurs and under what conditions it can lead to failure and what overall average expected life of a composite insulator is. For this a lot of researches have been done. This review summarizes the methods of artificial field testing (aging), natural testing, standards the developed for aging, techniques of analysis, results achieved until now about various parameters from various locations, handling guidelines and a conclusion on what is further needed.

关键词： polymeric insulators, aging, composite, SEM

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Flame-retardant properties of in situ sol-gel synthesized inorganic borosilicate/silicate polymer scaffold matrix comprising ionic liquid

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Frontiers in Energy 2019年第1期13卷 163-171页

作者： Kumar Sai SMARAN Rajashekar BADAM Raman VEDARAJAN Noriyoshi MATSUMI School of Materials Science Japan Advanced Institute of Science and Technology1-1 AsahidaiNomiIshikawa 923-1292Japan Division of Chemistry Graduate School of Humanities and SciencesOchanomizu University2-1-1OhtsukaBunkyo-kuTokyo 112-8610Japan School of Materials Science Japan Advanced Institute of Science and Technology1-1 AsahidaiNomi.Ishikawa 923-1292Japan Surface Science Laboratory Toyota Technological Institute2-12-1 HisakataTempaku Nagoya 468-8511Japan Centre for Fuel Cell Technology International Advanced Research Center for Powder Metallurgy and New MaterialsChennaiIndia

This paper focuses on the superiority of organic?inorganic hybrid ion-gel electrolytes for lithiumion batteries(LiBs)over commercial electrolytes,such as 1 M LiPF6 in 1:1 ethylene carbonate(EC):dimethyl carbonate{DMC){1 M LiPF6-EC:DMC},in terms of their flame susceptibility.These ion-gel electrolytes possess ionic liquid monomers,which are confined within the borosilicate or silicate matrices that are ideal for nonflammability.Naked flame tests confirm that the organicinorganic hybrid electrolytes are less susceptible to flames,and these electrolytes do not suffer from a major loss in terms of weight.In addition,the hybrids are self-extinguishable.Therefore,these hybrids are only oxidized when subjected to a flame unlike other commercial electrolytes used in lithium-ion batteries.Supplementary analyses using differential scanning calorimetric studies reveal that the hybrids are glassy until the temperature reaches more than 100℃.The current results are consistent with previously published data on the organic-inorganic hybrids.

关键词： inorganic polymeric borosilicate network organic-inorganic hybrids self-extinguishability non flammability lithium batteries flame-retardants

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