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Advances in fabricating spherical alginate hydrogels with controlled particle designs by ionotropic gelation as encapsulation systems

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Particuology 2016年第1期14卷 44-60页

作者： jun-yee leong Weng-Hoong Lam Kiang-Wei Ho Wan-Ping Voo Micky Fu-Xiang Lee Hui-Peng Lim Swee-Lu Lim Beng-Ti Tey Denis Poncelet alan Lagoon Selatan Bandar Sunway Selangor 46150 Malaysia Advanced Engineering Platform Monash University Malaysia Jalan Lagoon Selatan Bandar Sunway Selangor 46150 Malaysia Oniris UMR CNRS 6144 GEPEA rue de la Geraudiere BP82225 Nantes 44322 France

Alginate is a biopolymer that has exceptional gelling properties, which allow easy gel formation under safe and mild conditions. Consequently, it is often used to encapsulate a variety of cargos, such as cells, enzymes, and lipids, and is typically employed as a model to study hydrogel-based encapsulation sys- tems. Since the first use of alginate in the encapsulation field in the 1970s, many methods have been developed to produce alginate hydrogel particles of different sizes, structures, and morphologies. This review provides an overview of the current progress in the fabrication of alginate hydrogels with vari- ous particle designs, including a discussion of dispersion techniques to pre-template alginate particles, gelation mechanisms, considerations in selecting suitable fabrication methods, and future directions.

关键词： Alginate lonotropic gelation Immobilization Encapsulation Hydrogel

Effect of non-uniform swelling on coal multiphysics during gas injection: The triangle approach

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第4期16卷 1362-1372页

作者： Yifan Huang Jishan Liu Yaoyao Zhao Derek Elsworth yee-Kwong leong Department of Chemical Engineering School of EngineeringThe University of Western Australia35 Stirling HighwayWA 6009Australia State Key Laboratory of Coal Resources & Safe Mining China University of Mining& TechnologyBeijing100803China Department of Energy and Mineral Engineering G3 Centre and Energy InstituteThe Pennsylvania State UniversityUniversity ParkPA16802USA

In current dual porosity/permeability models,there exists a fundamental assumption that the adsorption-induced swelling is distributed uniformly within the representative elementary volume (REV),irrespective of its internal structures and transient ***,both internal structures and transient processes can lead to the non-uniform *** this study,we hypothesize that the non-uniform swelling is responsible for why coal permeability in experimental measurements is not only controlled by the effective stress but also is affected by the adsorption-induced *** propose a concept of the swelling triangle composed of swelling paths to characterize the evolution of the non-uniform swelling and serve as a core link in coupled multiphysics.A swelling path is determined by a dimensionless volumetric ratio and a dimensionless swelling *** swelling paths have the same start and end point,and each swelling path represents a unique swelling *** swelling path as the diagonal of the triangle represents the case of the uniform swelling while that as the two perpendicular boundaries represents the case of the localized *** paths of all intermediate cases populate inside the *** corresponding relations between the swelling path and the response of coal multiphysics are established by a non-uniform swelling *** define this method as the triangle approach and corresponding models as swelling path-based *** proposed concept and models are verified against a long-term experimental measurement of permeability and strains under constant effective *** results demonstrate that during gas injection,coal multiphysics responses have a close dependence on the swelling path,and that in both future experiments and field predictions,this dependence must be considered.

关键词： Transient process Heterogeneity Swelling triangle Swelling path Non-uniform swelling coefficient

Advancing Energy Systems with In-Situ and Operando Surface-Enhanced Raman Scattering Spectroscopy

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CCS Chemistry 2024年第6期6卷 1403-1421页

作者： Haoming Bao Shi Xuan leong Jaslyn Ru Ting Chen Zhenhai Shi Suli Chen Yan Lv Tianxi Liu In yee Phang Xing Yi Ling Key Laboratory of Synthetic and Biological Colloids Ministry of EducationInternational Joint Research Laboratory for Nano Energy CompositesSchool of Chemical and Material EngineeringJiangnan UniversityWuxi 214122 School of Chemistry Chemical Engineering and BiotechnologyNanyang Technological UniversitySingapore 637371

Surface-enhanced Raman scattering spectroscopy(SERS)has emerged as a powerful analytical technique to enable nanoscale investigations of energy *** mini-review focuses on the applications of in-situ and operando SERS in energy-related research,highlighting its unique capabilities and significant contributions to understanding energy storage and conversion *** first introduce the fundamental principles of SERS,key SERS-derived techniques,and commonly employed ***,we delve into the diverse applications of in-situ and operando SERS across various energy systems,encompassing photocatalytic and electrocatalytic systems,fuel cells,solar cells,and ***,we conclude with our perspective on the current challenges and prospects in this *** hope thismini-review serves as an essential overview to guide the design and implementation of in-situ and operando SERS studies of energy systems.

关键词： surface-enhanced Raman scattering spectroscopy in-situ operando energy systems photocatalysis electrocatalysis fuel cells solar cells batteries

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乙二醛和甲基乙二醛的来源及其环境效应

地球环境学报 2024年第3期15卷 402-420页

作者：黄俊霖 Tham yee jun 于潇禹凌镇浩中山大学大气科学学院珠海519082 中山大学海洋科学学院珠海519082

乙二醛和甲基乙二醛作为多种挥发性有机物的氧化反应中间产物,是臭氧和二次有机气溶胶的关键前体物。乙二醛和甲基乙二醛有着复杂的来源,既能通过多种自然或人为源直接排放,也可由诸多挥发性有机物二次氧化生成。由于排放及其前体物浓... 详细信息

乙二醛和甲基乙二醛作为多种挥发性有机物的氧化反应中间产物,是臭氧和二次有机气溶胶的关键前体物。乙二醛和甲基乙二醛有着复杂的来源,既能通过多种自然或人为源直接排放,也可由诸多挥发性有机物二次氧化生成。由于排放及其前体物浓度与组成存在差异,乙二醛及甲基乙二醛的浓度与来源特征在时间与空间分布上均有所不同,从而使其环境效应也呈现明显的时空分布差异。围绕乙二醛与甲基乙二醛的污染特征及环境效应,综述乙二醛和甲基乙二醛的浓度水平、时空分布、来源特征,并总结分析其在臭氧和二次有机气溶胶生成中的作用。在此基础上,讨论和分析未来关于乙二醛和甲基乙二醛的研究的方向。

关键词：乙二醛甲基乙二醛源解析臭氧二次有机气溶胶

hale gas reservoir modeling and production evaluation considering complex gas transport mechanisms and dispersed distribution of kerogen

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Petroleum Science 2021年第1期18卷 195-218页

作者： Jie Zeng Jishan Liu Wai Li yee-Kwong leong Derek Elsworth Jianchun Guo School of Engineering The University of Western Australia35 Stirling HighwayPerthWA 6009Australia Department of Energy and Mineral Engineering G3 Center and Energy InstituteThe Pennsylvania State UniversityUniversity ParkPA 16802USA State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500China

Stimulated shale reservoirs consist of kerogen,inorganic matter,secondary and hydraulic *** dispersed distribution of kerogen within matrices and complex gas flow mechanisms make production evaluation *** we establish an analytical method that addresses kerogen-inorganic matter gas transfer,dispersed kerogen distribution,and complex gas flow mechanisms to facilitate evaluating gas *** matrix element is defined as a kerogen core with an exterior inorganic *** most previous models,we merely use boundary conditions to describe kerogen-inorganic matter gas transfer without the instantaneous kerogen gas source *** is closer to real inter-porosity flow conditions between kerogen and inorganic *** diffusion,surface diffusion,adsorption/desorption,and slip corrected flow are involved in matrix gas ***-fracture coupling is realized by using a seven-region linear flow *** model is verified against a published model and field *** reveal that inorganic matrices serve as a major gas source especially at early *** provides limited contributions to production even under a pseudo-steady *** properties’influence starts from the late matrix-fracture inter-porosity flow regime,while inorganic matter properties control almost all flow regimes except the early-mid time fracture linear flow *** contribution of different linear flow regions is also documented.

关键词： Analytical solution Shale gas reservoir Well performance Kerogen and inorganic matter

CNT toughened aluminium and CFRP interface for strong adhesive bonding

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Nano Materials Science 2022年第3期4卷 266-275页

作者： Gang Han Bo Tan Fei Cheng Binhua Wang yee-Kwong leong Xiaozhi Hu Department of Mechanical Engineering University of Western AustraliaPerthWA6009Australia Department of Chemical Engineering University of Western AustraliaPerthWA6009Australia Shaoxing Baojing Composite Materials Co. LtdShaoxing312073PR China School of Materials Science and Engineering Southwest University of Science and TechnologyMianyang621000PR China Key Laboratory of Road Construction Technology and Equipment MOEChang'an University Xi'an710064PR China

This study presents a simple technique for strengthening the adhesive-bond strength between aluminium(Al)substrate and carbon fibre reinforced polymer(CFRP) utilising resin pre-coating(RPC) with carbon nanotubes(CNTs). The CNT-containing RPC solution with 90 wt% acetone and 10 wt% resin(without hardener) was applied onto Al substrates, where micro-/nano-vertical channels had been created by chemical or mechanical surface treatments to accommodate CNTs. RPC was able to fill all micro-/nano-cavities over the Al substrate surface, then CNTs were pulled into those vertical micro-channels by the capillary action generated from acetone *** epoxy adhesive(resin + hardener) was applied after the CNT-containing RPC treatment. CNTs bridging across the interface between the adhesive joint and Al substrate and sealing of micro-/nano-cavities by RPC effectively enhanced the interfacial shear bond strength between the Al substrate and CFRP by 30–100%depending on the Al substrate surface profiles. Al substrates with two different chemical treatments were compared in this study for the effectiveness of CNT interfacial reinforcement. Results from a steel substrate after sandblasting were also included for comparison.

关键词： Shear bond strength Interfacial toughening CNT Resin pre-coating(RPC) Chemical surface treatment Aluminium/CFRP Laminate

Incipient motion of cohesionless sediments on riverbanks with ground water injection

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International Journal of Sediment Research 2012年第1期27卷 111-119页

作者： Yan LU Yong-jun LU yee-meng CHIEW Nanjing Hydraulic Research Institute State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering School of Civil and Environmental Engineering Nanyang Technological Univ.

This study investigates the influence of ground water injection on the initial movement of non-cohesive sediment particles on a riverbank slope analytically and *** including the hydraulic gradient in the force analysis,the critical condition was derived to account for the effect of seepage flow, showing that the seepage hydraulic gradient and the riverbank slope are governing parameters in modifying the incipient motion of sediments on a riverbank *** investigations were performed in an open-channel flume for various riverbank slopes and hydraulic gradients of injection, showing that the critical shear stress increases with decreasing riverbank slopes and vise-versa,while injection reduces the critical *** experimental data agree well with the theoretical derived expression of the critical condition in the case of injection.

关键词： Incipient motion Riverbank Injection Sediment Seepage

Usage of topical insulin for the treatment of diabetic keratopathy,including corneal epithelial defects

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World Journal of Diabetes 2023年第6期14卷 930-938页

作者： Ching yee leong Ainal Adlin Naffi Wan Haslina Wan Abdul Halim Mae-Lynn Catherine Bastion Department of Ophthalmology Universiti Kebangsaan Malaysia Medical CentreKuala Lumpur 56000Wilayah PersekutuanMalaysia

BACKGROUND Diabetic keratopathy(DK)occurs in 46%-64%of patients with diabetes and requires serious *** patients with diabetes,the healing of corneal epithelial defects or ulcers takes longer than in patients without *** is an effective factor in wound *** ability of systemic insulin to rapidly heal burn wounds has been reported for nearly a century,but only a few studies have been performed on the effects of topical insulin(TI)on the *** with TI is effective in treating *** To review clinical and experimental animal studies providing evidence for the efficacy of TI to heal corneal *** National and international databases,including PubMed and Scopus,were searched using relevant keywords,and additional manual searches were conducted to assess the effectiveness of TI application on corneal wound *** articles published from January 1,2000 to December 1,2022 were *** relevancy of the identified citations was checked against predetermined eligibility standards,and relevant articles were extracted and *** A total of eight articles were found relevant to be discussed in this review,including four animal studies and four clinical *** to the studies conducted,TI is effective for corneal re-epithelialization in patients with diabetes based on corneal wound size and healing *** Available animal and clinical studies have shown that TI promotes corneal wound healing by several *** use of TI was not associated with adverse effects in any of the published *** studies are needed to enhance our knowledge and understanding of TI in the healing of DK.

关键词： Diabetes mellitus Diabetic keratopathy Topical insulin Healing

Implementation Study of a Centralized Routing Protocol for Data Acquisition in Wireless Sensor Networks

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Wireless Sensor Network 2011年第5期3卷 167-173页

作者： Trung Hieu Pham Xue jun Li Wai yee leong Peter Han Joo Chong 不详

Wireless sensor networks (WSNs) attract considerable amount of research efforts from both industry and academia. With limited power and computational capability available on a sensor node, robustness and efficiency are the main concerns when designing a routing protocol for WSNs with low complexity. There are various existing design approaches, such as data-centric approach, hierarchical approach and location-based approach, which were designed for a particular application with specific requirements. In this paper, we study the design and implementation of a routing protocol for data acquisition in WSNs. The designed routing protocol is named Centralized Sensor Protocol for Information via Negotiation (CSPIN), which essentially combines the advertise-request-transfer process and a routing distribution mechanism. Implementation is realized and demonstrated with the Crossbow MicaZ hardware using nesC/TinyOS. It was our intention to provide a hand-on study of implementation of centralized routing protocol for WSNs.

关键词： Wireless Sensor Network Three-Way Communication Centralized Sensor Protocols for Information Negotiation