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Advances in haemostatic sponges: Characteristics and the underlying mechanisms for rapid haemostasis

Bioactive Materials 2023年第9期27卷 231-256页

作者： Akriti Nepal Huong D.N.Tran Nam-Trung Nguyen Hang Thu Ta queensland micro-and nanotechnology Centre Griffith UniversityNathanQueensland4111Australia Australian Institute for Bioengineering and nanotechnology University of QueenslandSt LuciaQueensland4072Australia Bioscience Discipline School of Environment and ScienceGriffith UniversityNathanQueensland4111Australia

In traumatized patients, the primary cause of mortality is uncontrollable continuous bleeding and unexpected intraoperative bleeding which is likely to increase the risk of complications and surgical failure. High expansion sponges are effective clinical practice for the treatment of wound bleeding (irregular/deep/narrow) that are caused by capillaries, veins and even arterioles as they possess a high liquid absorption ratio so can absorb blood platelets easily in comparison with traditional haemostasis treatments, which involve compression, ligation, or electrical coagulation etc. When in contact with blood, haemostatic sponges can cause platelet adhesion, aggregation, and thrombosis, preventing blood from flowing out from wounds, triggering the release of coagulation factors, causing the blood to form a stable polymerized fibre protein, forming blood clots, and achieving the goal of wound bleeding control. Haemostatic sponges are found in a variety of shapes and sizes. The aim of this review is to facilitate an overview of recent research around haemostatic sponge materials, products, and technology. This paper reviews the synthesis, properties, and characteristics of haemostatic sponges, together with the haemostasis mechanisms of haemostatic sponges (composite materials), such as chitosan, cellulose, gelatin, starch, graphene oxide, hyaluronic acid, alginate, polyethylene glycol, silk fibroin, synthetic polymers silver nanoparticles, zinc oxide nanoparticles, mesoporous silica nanoparticles, and silica nanoparticles. Also, this paper reviews commercial sponges and their properties. In addition to this, we discuss various in-vitro/in-vivo approaches for the evaluation of the effect of sponges on haemostasis .

关键词： Haemostatic sponge Characteristics Mechanism Haemostasis Nanoparticles

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Tailoring mesoporous-silica nanoparticles for robust immobilization of lipase and biocatalysis

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Nano Research 2017年第2期10卷 605-617页

作者： Mohammad Kalantari Meihua Yu Yannan Yang Ekaterina Strounina Zhengying Gu Xiaodan Huang Jun Zhang Hao Song Chengzhong Yu Australian Institute for Bioengineering and nanotechnology The University of Queensland Brisbane QLD 4072 Australia center for Advanced Imaging The University of Queensland Brisbane QLD 4072 Australia

The rational design of nano-carriers is critical for modem enzyme immobilization for advanced biocatalysis. Herein, we report the synthesis of octadecylalkyl- modified mesoporous-silica nanoparticles （C18-MSNs） with a high C18 content （-19 wt.%） and tunable pore sizes （1.6--13 nm）. It is demonstrated that the increased hydrophobic content and a tailored pore size （slightly larger than the size of lipase） are responsible for the high performance of immobilized lipase. The optimized C18-MSNs exhibit a loading capacity of 711 mg/g and a specific activity 5.23 times higher than that of the free enzyme. Additionally, 93% of the initial activity is retained after reuse five times, which is better than the best performance reported to date. Our findings pave the way for the robust immobilization of lipase for biocatalytic applications.

关键词： silica hydrophobic lipase immobilization hyperactivation pore size

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The fabrication and characterization of 4H-SiC power UMOSFETs

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Chinese Physics B 2013年第2期22卷 426-428页

作者：宋庆文张玉明韩吉胜 Philip Tanner Sima Dimitrijev 张义门汤晓燕郭辉 School of Technical Physics Xidian University Key Laboratory of Wide Band Gap Semiconductor Materials and Devices Xidian University queensland micro and nanotechnology center Griffith University Griffith School of Engineering Griffith University

The fabrication of 4H-SiC vertical trench-gate metal-oxide-semiconductor field-effect transistors（UMOSFETs） is reported in this *** device has a 15-μm thick drift layer with 3×10^15 cm^-3 N-type doping concentration and a 3.1μm channel *** measured on-state source-drain current density is 65.4 A/cm^2 at Vg = 40 V and VDS = 15 *** measured threshold voltage（Vth） is 5.5 V by linear extrapolation from the transfer characteristics.A specific on-resistance（Rsp-on） is 181 mΩ·cm^2 at Vg = 40 V and a blocking voltage（BV） is 880 V（IDS = 100 μA@880V） at Vg = 0 V.

关键词： UMOSFETs 4H-SiC specific on-resistance blocking voltage

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Nano-confined ammonia borane for chemical hydrogen storage

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Frontiers of Chemical Science and Engineering 2012年第1期6卷 27-33页

作者： M. A.WAHAB Huijun ZHAO X. D. YAO ARC Centre of Excellence for Functional Nanomaterials Australian Institute for Engineering and Nanotechnology the University of Queensland St Lucia 4072 Australia Centre for Clean Energy and Environment Griffith University Gold Coast 4222 Australia queensland micro-and nanotechnology Centre Griffith University Nathan 4111 Australia

There is a great demand for a sufficient and sustainable energy supply. Hence, the search for applicable hydrogen storage materials is extremely important owing to the diversified merits of hydrogen energy. In this regard, ammonia borane （NH3BH3, AB） containing 19.6wt-% hydrogen has been considered as a promising material for hydrogen storage applications to realize the ＂hydrogen economy＂, but with limits from slow kinetics of hydrogen release and by-product of trace gases such as ammonia and borazine. In this review, we introduce the recent research on AB, regarding to the nanoconfinement effect on improving the kinetics at a relatively low temperature and the prevention/reduction of undesirable gas formation.

关键词： ammonia borane hydrogen storage

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Size effect of semiconductor quantum wells in excitonic spin generation under drift

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Optoelectronics Letters 2020年第4期16卷 318-320页

作者： M.Idrish Miah Department of Physics University of ChittagongChittagong 4331Bangladesh queensland micro-and nanotechnology Centre Griffith UniversityBrisbane 4111Australia

The excitonic spin polarization in dependence of the size of semiconductor quantum well(QW)was investigated by observing the two different circular polarizations of photoluminescence(PL).From the measurements of PL in QWs,it was found that there is a difference between the two different polarization conditions,which is caused by spindependent phase-space *** PL spin polarization was estimated from the signals of the left and right circularly polarized PL and was found to depend on the size of the wells as well as on the strength of the bias *** effects of the size of the well and applied electric field on the excitonic PL spin polarization were studied.

关键词： field. quantum circular

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Nanoimprint Lithography:A Processing Technique for Nanofabrication Advancement

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Nano-micro Letters 2011年第2期3卷 135-140页

作者： Weimin Zhou Guoquan Min Jing Zhang Yanbo Liu Jinhe Wang Yanping Zhang Feng Sun Laboratory of nanotechnology Shanghai Nanotechnology Promotion Center (SNPC)

Nanoimprint lithography(NIL) is an emerging micro/nano-patterning technique,which is a high-resolution,high-throughput and yet simple fabrication *** to International Technology Roadmap for Semiconductor(ITRS),NIL has emerged as the next generation lithography candidate for the22 nm and 16 nm technological *** this paper,we present an overview of nanoimprint *** classfication,research focus,critical issues,and the future of nanoimprint lithography are intensively elaborated.A pattern as small as 2.4 nm has been ***-wafer nanoimprint lithography has been completed on a 12-inch ***,12.5 nm pattern resolution through soft molecular scale nanoimprint lithography has been achieved by EV Group,a leading nanoimprint lithography technology supplier.

关键词： Nanoimprint lithography Soft molecular scale Nanofabrication

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Tantalum （Oxy）Nitride： Narrow Bandgap Photocatalysts for Solar Hydrogen Generation

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Engineering 2017年第3期3卷 365-378页

作者： Mu Xiao Songcan Wang Supphasin Thaweesak Bin Luo Lianzhou Wang Nanomaterials center School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology The University of QueenslandBrisbane QLD 4072 Australia

Photocatalytic water splitting, which directly converts solar energy into hydrogen, is one of the most desirable solar-energy-conversion approaches. The ultimate target of photocatalysis is to explore efficient and stable photocatalysts for solar water splitting. Tantalum （oxy）nitride-based materials are a class of the most promising photocatalysts for solar water splitting because of their narrow bandgaps and sufficient band energy potentials for water splitting. Tantalum （oxy）nitride-based photocatalysts have experienced intensive exploration, and encouraging progress has been achieved over the past years. However, the solar- to-hydrogen （STH） conversion efficiency is still very far from its theoretical value. The question of how to better design these materials in order to further improve their water-splitting capability is of interest and importance. This review summarizes the development of tantalum （oxy）nitride-based photocatalysts for solar water spitting. Special interest is paid to important strategies for improving photocatalytic water- splitting efficiency. This paper also proposes future trends to explore in the research area of tantalum-based narrow bandgap photocatalysts for solar water splitting.

关键词： Tantalum-based photocatalyst Narrow bandgap Water splitting Hydrogen

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Tuning oxygen vacancies in two-dimensional iron-cobalt oxide nanosheets through hydrogenation for enhanced oxygen evolution activity

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Nano Research 2018年第6期11卷 3509-3518页

作者： Linzhou Zhuang Yi Jia Tianwei He Aijun Du Xuecheng Yan Lei Ge Zhonghua Zhu Xiangdong Yao School of Chemical Engineering The University of Queensland Brisbane 4072 Australia School of Environment and Science and queensland micro- and nanotechnology Centre Griffith University Nathan Campus Brisbane 4111 Australia School of Chemistry Physics and Mechanical Engineering Queensland University of Technology Gardens Point Campus Brisbane 4001 Australia

The oxygen evolution reaction （OER） represents the rate-determining step of electrocatalytic water splitting into hydrogen and oxygen. Creating oxygen vacancies and adjusting their density has proven to be an effective strategy to design high-performance OER catalysts. Herein, a hydrogenation method is applied to treat a two-dimensional （2D） iron-cobalt oxide （Fe1Co1Ox-origin）, with the purpose of tuning its oxygen vacancy density. Notably, compared with Fe1Co1Ox-origin, the iron-cobalt oxide hydrogenated at 200℃ and 2.0 MPa optimized conditions exhibits a markedly improved OER activity in 1.0 M KOH （with an overpotential 17 of 225 mV at a current density of 10 ***^-2） and a rapid reaction kinetics （with a Tafel slope of 36.0 mV·dec^-1）. Moreover, the OER mass activity of the hydrogenated oxide is 1.9 times that of Fe1Co1Ox-origin at an overpotential of 350 mV. The experimental results, combined with density functional theory （DFT） calculations, reveal that the optimal control of oxygen vacancies in 2D Fe1Co1Ox via hydrogenation can improve the electronic conductivity and promote OH- adsorption onto nearby low-coordinated Co^3＋ sites, resulting in a significantly enhanced OER activity.

关键词： hydrogenation tuning oxygen vacancy oxygen evolution reaction

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Asymmetrical Obstacles Enable Unilateral Inertial Focusing and Separation in Sinusoidal microchannel

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Cyborg and Bionic Systems 2023年第1期4卷 233-242页

作者： Haotian Cha Yuchen Dai Helena HWBHansen Lingxi Ouyang Xiangxun Chen Xiaoyue Kang Hongjie An Hang Thu Ta Nam-Trung Nguyen Jun Zhang queensland micro-and nanotechnology Centre Griffith UniversityNathanQueensland 4111Australia School of Engineering University of TasmaniaChurchill AvenueTasmania 7005Australia Bioscience Discipline School of Environment and ScienceGriffith UniversityNathanQueensland 4111Australia

Inertial microfluidics uses the intrinsic fluid inertia in confined channels to manipulate the particles and cells in a simple,high-throughput,and precise *** focusing in a straight channel results in several equilibrium positions within the cross *** channel curvature and adjusting the cross-sectional aspect ratio and shape can modify inertial focusing positions and can reduce the number of equilibrium *** this work,we introduce an innovative way to adjust the inertial focusing and reduce equilibrium positions by embedding asymmetrical obstacle *** demonstrated that asymmetrical concave obstacles could break the symmetry of original inertial focusing positions,resulting in unilateral *** addition,we characterized the influence of obstacle size and 3 asymmetrical obstacle patterns on unilateral inertial ***,we applied differential unilateral focusing on the separation of 10-and 15-μm particles and isolation of brain cancer cells(U87MG)from white blood cells(WBCs),*** results indicated an excellent cancer cell recovery of 96.4%and WBC rejection ratio of 98.81%.After single processing,the purity of the cancer cells was dramatically enhanced from 1.01%to 90.13%,with an 89.24-fold *** believe that embedding asymmetric concave microobstacles is a new strategy to achieve unilateral inertial focusing and separation in curved channels.

关键词： obstacle separation concave

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Remarkable Resistance Change in Plasma Oxidized TiOx/TiNx Film for Memory Application

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Chinese Physics Letters 2007年第4期24卷 1103-1105页

作者：吴良才宋志棠饶峰徐成张挺殷伟君封松林 nanotechnology Laboratory Research Center of Functional Semiconductor Film Engineering and Technology Shanghai Institute of Micro-system and Information Technology Chinese Academy of Sciences Shanghai 200050

We report the experimental phenomenon of large resistance change in plasma oxidized TiOx/TiNx film fabricated on W bottom-electrode-contact （W-BEC） array. The W-BEC in diameter 26Ohm is fabricated by a 0.18μm CMOS technology, and the TiOx/TiNx cell array is formed by rf magnetron sputtering and reactive ion etching. In current-voltage （I- V） measurement for current-sweeping mode, large snap-back of voltage is observed, which indicates that the sample changes from high-resistance state （HRS） to low-resistance state （LRS）. In the I-V measurement for voltage-sweeping mode, large current collapse is observed, which indicates that the sample changes from LRS to HRS. The current difference between HRS and LRS is about two orders. The threshold current and voltage for the resistance change is about 5.0- 10^-5 A and 2.5 V, respectively. The pulse voltage can also change the resistance and the pulse time is as shorter as 30 ns for the resistance change. These properties of TiOx/TiNx film are comparable to that of conventional phase-change material, which makes it possible for RRAM application.

关键词： RANDOM-ACCESS MEMORY THIN OXIDE-FILMS GE2SB2TE5 FILMS ELECTRICAL-PROPERTIES NEGATIVE RESISTANCE NIO FILMS

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