Water flux and antimicrobial activity of Ag-nanoparticles on a polyvinylidene fluoride (PVDF) hollow fiber membrane

고은주,박희민,이용택 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0

The chemical properties of a polyvinylidene fluoride (PVDF) hollow fiber membrane were prepared to yield a significant increase in the antimicrobial activity and enhance water flux. In this study, an increase of water flux was induced by membrane stretching and a crosslinked polyvinyl alcohol (PVA) coating with glutaraldehyde (GA). The size of sliver nanoparticles (Ag-PVA) ranged from 30 to 100 ㎚ with a thickness of 1 to 5 ㎚. These modifications resulted in an increased water flux and fouling resistance that the water flux (LMH) of modified PVDF membranes ranged from 750 to 1400 and was dependent on the molecular weight of polyvinyl alcohol. The inactivation of gram-negative E. coli bacteria by silver ions showed a clear zone of inhibition averaging 3.1 ㎜, and the antimicrobial activity of released silver ions in membrane filtered water.

Hybrid nanocomposites of a molybdenum disulfide (MoS2) based hydrophobic filler for a robust self-cleaning effect

고은주,이용택 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.96 No.-

This work has been sought to improve the self-cleaning effect in insulators and insulating covers made ofpolymer material used in electric supply facilities by modifying their surface hydrophobicity. Themultilayers 2D nanosheet MoS2 was exfoliated into a single or several layers to obtain a highlyflexiblenanostructure. MoS2-intermediate derivate was formed by disulfide bonds via a reaction between thethiol groups of cysteine and the sulfide groups of the outer layers of MoS2. This MoS2-intermediatederivate was reacted with polydimethylsiloxane to fabricate hybrid organic-inorganic nanocompositesfillers, then, the adhesion, mechanical strength, and surface roughness were determined. A 7.5 wt%nanofiller-containing polymeric insulator and insulating cover exhibited an increasing in recedingcontact angle of about 20 –36 compared to the pristine material. This work demonstrated the selfcleaningproperties as in terms of their high voltage tracking resistance, insulation strength, breakdownvoltage and strength, and weatherability effects afforded by the nanocompositefillers.

인터넷 의류광고 유형이 인터넷 광고 효과에 미치는 영향

고은주,목보경 한국의류학회 2002 한국의류학회지 Vol.26 No.9,10

The purpose of this study was 1) to investigate the current situation of internet advertising, 2) to examine the relationship between the advertising type and internet advertising effects, 3) to examine the relationship between internet advertising effects and purchase intention. A sample of 152 apparel consumers participated in this survey research. The survey of design with a Questionnaire was employed and descriptive statistics and ANOVA were used for data analysis. Three types of fashion advertising, banner type, we bsite type, email type were used for the data collection. for each type, two samples were included. The highest scores in the attitude to advertising and in the attitude to brand were found at the banner type, The highest score in the attitude to product was found at the email type. Significant relationships were found between the advertising type and the effect of internet advertising(i.e., attitude to advertising attitude to product). The attitude to brand was not related to the advertising effect, Also, the significant relationship between all advertising effects and purchase intention were found. Internet advertising information assembled in the review of literature and the results from this empirical study provide direction for organizations who are developing internet marketing or internet advertisement.

Development of a multi-functional sensor for detecting creatinine, bilirubin, and glucose

고은주 한국공업화학회 2023 한국공업화학회 연구논문 초록집 Vol.2023 No.1

Antimicrobial activity and fouling resistance of a polyvinylidene fluoride (PVDF) hollow-fiber membrane

고은주,이용택 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.47 No.-

The properties of a PVDF membrane were modified to yield a significant increase in antimicrobial activityand to enhance the waterflux. An increase in waterflux was induced by a mechanical stretching processthat increased the degree of crystallinity in the polymeric membrane. The hydrophilic modification had agreat influence on membrane fouling resistance and waterflux. The antibacterial activity was deactivatedby the sustained and continuous release of silver ions. Ag-PVA/GA-treated PVDF membranes exhibitedsuperior antibacterial activity, with a clear zone of inhibition of 3.11.2 mm against Escherichia colibacteria and bio-efficacy against colony growth.

습도에 민감한 셀프힐링 다공성 나노캡슐의 제조

고은주,전주현,이용택 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1

습도에 민감하게 반응하는 나노캡슐을 제조하여 자가반응 및 셀프힐링이 필요한 부위에 사용하여 정확한 자가치유 기능성을 얻었다. 나노 스케일 캡슐의 넓은 표면적 효과를 이용하여 정확하고 선택적인 방출 효과 기대할 수 있고, 외부의 습도에 민감하게 반응하는 셀프-어셈블리 기공 구조를 이용하여 일정량 이상의 습도 조건에서 방출 기작을 유도하였다. 셀프-어셈블리 기공 구조는 캡슐의 표면에 부러시 형태의 음이온성 고분자를 화학적으로 결합시켜 브러시의 반복적인 탱글링 현상에 의해 코어물질의 방출을 조절하였다. 셀프힐링 캡슐의 평균적인 방출 기간은 셀프-에셈블리 기공의 열림-닫힘 구조를 통해 방출기간은 늘어나고 방출된 코어물질에 의해 자가치유 효과는 지속된다. 셀프힐링 나노캡슐은 고성능 여과재 및 항균성 개인보호 체계 방호복, 반응 물질 재료를 이용한 자가 힐링, 항균 저장 및 수출 포장재 또한, 제독 및 치료 키트 소재로 적용 가능하다.

Preparation and modification of an embossed nanofibrous materials for robust filtration performance of PM0.2 removal

고은주,박희민,이용택 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.93 No.-

This work develops an embossed nanofiber membranes (ENMs) using 3D patterns for use in air maskfiltration and compares this structure with a planar nanofibrous materials (PNMs). The embossednanofiber membrane (ENM) was prepared using a combination of 3D printing and electrospinningtechnologies to increase the surface area of the ENM compared to that of planar structures. The surfacearea of the ENM was three times higher (66 m3 g 1) than that of the PNM (23 m3 g 1). The embossingstructure depended on hole size and height of the grid in the 3D pattern. The pore size of the nanofibermembranes (NMs) was controlled to 0.2 mm to enable robustfiltration of ultrafine airborne particle andsmog pollutants. The polyamide 6 ENM achieved excellentfiltration efficiency via corona surface ionicmodification with ( CH2CHCONH2+) or anion ( NHCH2COO ). Ion-modification generated anelectrostatic attraction or van der Waals force/repulsive force between pollutant particles and theNM surface. The dynamic particle barrier efficiency of ionic ENMs was evaluated by dynamic particleremoval efficiency (%), penetration (%), resistance (mmH2O), and air permeability (m3/m2/min) tests. Well-developed pore structures and large surface area of the NM were enhanced by the embossedstructure compared to that of PNM.

Manufacturing fouling and wetting resistance nanofiber membrane for membrane distillation process

고은주,이용택 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0

정밀화학 공정에 적용할 수 있는 방오성(anti-fouling)과 내습성(anti-wetting resistance) 기능이 우수한 발수성 및 발유성 멤브레인을 개발하여 공정의 간소화를 통한 에너지 절감용 친환경 분리막 소재를 개발하였다. 발수 및 발유 성분을 분리/정제하기 위하여 공정 압력에 민감한 평막 형태의 나노 섬유 멤브레인 소재를 개발하여 소수성 개질과 코팅공정을 통해 막의 발수 및 발유 특성을 강화하여 공정효율 및 경제적 이익을 도모하였다. 또한, 폐기되기 쉬운 자원을 재활용함으로써 친환경 분리막 공정에 적용하여 분리 및 정제 효율을 측정하였다.

Nanocomposite omniphobic membrane for the removal of oily organic materials in membrane distillation process

고은주,이용택 한국막학회 2022 한국막학회 총회 및 학술발표회 Vol.2022 No.04

컴퓨터 포렌식스 지원을 위한 시스템 로그 및 휘발성 정보 수집에 관한 연구

고은주,오세민,장은겸,이종섭,최용락,Gho, Eun-Ju,Oh, Se-Min,Jang, Eun-Gyeom,Lee, Jong-Sub,Choi, Yong-Rak 한국정보기술전략혁신학회 2007 情報學硏究 Vol.10 No.4

In Digital Computing Environment, volatile information such as register, cache memory, and network information are hard to make certain of a real-time collection because such volatile information are easily modified or disappeared. Thus, a collection of volatile information is one of important step for computer forensics system on ubiquitous computing. In this paper, we propose a volatile information collection module, which collects variable volatile information of server system based on memory mapping in real-time.