[특별강연3] Telioform System A New Multi Component Organic/Inorganic System From Ciba Specialty Chemicals

Min Byungjin(민병진),Lim Kyungbin(임경빈) 한국펄프·종이공학회 2006 한국펄프·종이공학회 학술발표논문집 Vol.- No.-

Antioxidant and Bioactive Films to Enhance Food Quality and Phytochemical Production during Ripening

Byungjin Min,Paul L. Dawson,Kalidas Shetty 한국축산식품학회 2005 한국축산식품학회지 Vol.25 No.1

Antioxidant films are one active packaging technology that can extend food shelf-life through preventing lipid oxidation, stabilizing color, maintaining sensory properties and delaying microbial growth in foods. Because raw, fresh and minimal processed foods are more perishable during storage or under display conditions than further processed foods, they rapidly lose their original quality. Foods are susceptible to physical, chemical, and biochemical hazards to which packaging films can be effective barriers. Although films incorporated natural (tocopherols, flavonoids and phenolic acids) or synthetic antioxidants (BHT, BHA, TBHQ, propyl gallate) have been extensively tested to improve quality and safety of various foods, food applications require addressing issues such as physical properties, chemical action, cost, and legal approval. Increased interest in natural antioxidants as substitutes for synthetic antioxidants has triggered research on use of the new natural antioxidants in films and coatings. Use of new components (phytochemicals) as film additives can improve food quality and human health. The biosynthesis of plant phenolics can potentially be optimized by active coatings on harvested fruits and vegetables. These coatings can trigger the plants natural proline-linked pentose phosphate pathway to increase the phenolic contents and maintain overall plant tissue quality. This alternate metabolic pathway has been proposed by Dr. K. Shetty and is supported by numerous studies. A new generation of active food films will not only preserve the food, but increase food's nutritional quality by optimizing raw food biochemical production of phytochemicals.

Antioxidant and Bioactive Films to Enhance Food Quality and Phytochemical Production during Ripening

Min Byungjin,Dawson Paul L.,Shetty Kalidas Korean Society for Food Science of Animal Resource 2005 한국축산식품학회지 Vol.25 No.1

Antioxidant films are one active packaging technology that can extend food shelf-life through preventing lipid oxidation, stabilizing color, maintaining sensory properties and delaying microbial growth in foods. Because raw, fresh and minimal processed foods are more perishable during storage or under display conditions than further processed foods, they rapidly lose their original quality. Foods are susceptible to physical, chemical, and biochemical hazards to which packaging films can be effective barriers. Although films incorporated natural (tocopherols, flavonoids and phenolic acids) or synthetic antioxidants (BHT, BHA, TBHQ, propyl gallate) have been extensively tested to improve quality and safety of various foods, food applications require addressing issues such as physical properties, chemical action, cost, and legal approval. Increased interest in natural antioxidants as substitutes for synthetic antioxidants has triggered research on use of the new natural antioxidants in films and coatings. Use of new components (phytochemicals) as film additives can improve food quality and human health. The biosynthesis of plant phenolics can potentially be optimized by active coatings on harvested fruits and vegetables. These coatings can trigger the plants natural proline-linked pentose phosphate pathway to increase the phenolic contents and maintain overall plant tissue quality. This alternate metabolic pathway has been proposed by Dr. K. Shetty and is supported by numerous studies. A new generation of active food films will not only preserve the food, but increase food's nutritional quality by optimizing raw food biochemical production of phytochemicals.

Efficacy and Safety of Guardcel Nasal Packing After Endoscopic Sinus Surgery: A Prospective, Single-Blind, Randomized Controlled Study

Kang, Byungjin,Kim, Jeong-Rok,Shin, Jae-Min,Park, Il-Ho,Lee, Heung-Man Korean Society of Otorhinolaryngology-Head and Nec 2017 Clinical and Experimental Otorhinolaryngology Vol.10 No.3

<P><B>Objectives</B></P><P>Nasal packing after endoscopic sinus surgery is frequently used to control postoperative bleeding, enhance the wound healing process, and prevent lateralization of the middle turbinate, which causes insufficient ventilation. Many biodegradable materials have been developed to reduce pain and mucosal damage during packing removal. The purpose of this study was to compare the efficacy of Guardcel (Genewel Co.) middle meatal packing with a traditional nonabsorbable middle meatal packing, Merocel (Medtronic Xomed), on wound healing and patient satisfaction.</P><P><B>Methods</B></P><P>In this prospective, single-blind, randomized controlled study, we enrolled 32 consecutive patients (64 nostrils) undergoing bilateral endoscopic sinus surgery at Korea University Guro Hospital from February 2015 to August 2015. Guardcel and Merocel were inserted postoperatively into a randomly assigned side. Objective findings about bleeding, hemostasis, adhesion, and infection were evaluated with nasal endoscopy. Patients’ symptoms including pain and nasal obstruction were evaluated with a visual analog scale. Each evaluation was done at 2–3 days, 1 week, 2 weeks, and 4 weeks after surgery.</P><P><B>Results</B></P><P>At 2–3 days after endoscopic sinus surgery, the Guardcel side had a significantly less hemostasis time than the Merocel side (<I>P</I>=0.001). During this period, the pain during packing removal was significantly lower on the Guardcel-inserted side than the Merocel-inserted side (<I>P</I>=0.002). At two weeks after surgery, the adhesion score on the Guardcel side was significantly lower than that of the Merocel side (<I>P</I>=0.011). Other parameters during the study follow-up periods were not statistically significant. There were no severe adverse reactions.</P><P><B>Conclusion</B></P><P>Guardcel, a newly developed packing material, appeared to shorten the hemostasis time and reduce pain sensation at 2–3 days after surgery; it also prevented adhesion formation 2 weeks after surgery when compared with the control. Guardcel can be an effective and safe candidate to replace conventional packing materials after endoscopic sinus surgery.</P>

순차적 마이크로 몰딩 방법을 이용한 이방성 패치 입자 제조 기술

이병진(Byungjin Lee),최창형(Chang-Hyung Choi),김종민(Jongmin Kim),강성민(Sung-Min Kang),남진오(Jin-Oh Nam),진시형(Si-Hyung Jin),이창수(Chang-Soo Lee) 한국고분자학회 2015 폴리머 Vol.39 No.5

본 연구는 이방성 패치를 가지는 마이크로 입자의 제조를 위한 순차적 마이크로 몰딩 기술에 관한 것이다. 희석된 단량체와 젖음성 유체를 사용하여 PDMS 마이크로 몰드 상에서 1차적으로 구형의 입자를 제조하고, 물리적, 화학적 이방성을 가지는 입자를 간편하게 제조하는 기술이다. 본 연구팀은 실제 미키마우스 형태의 입자를 제조하여 제시한 방법이 실제로 구현 가능함을 입증하였고, 또한 휘발성 용매를 이용하여 단량체의 농도를 조절함으로써 미키마우스 형태 입자에서 패치의 크기를 15에서 31 μm까지 제어할 수 있었다. 더 나아가, 물리적, 화학적 특성 이방성을 동시에 가지는 정전기적 이방성 입자를 제조하였고, 수용액 상에서 전하를 가지는 형광염료를 통해 선택적인 염색을 하고 이를 형광 분석을 통해 입증하였다. 본 연구에서 제시한 마이크로 몰딩 기술은 간단한 방법으로 이방성 입자를 제조하는 것이 가능하며 이러한 방법은 자기조립 구조체를 제조하는 방법에 널리 이용이 가능할 것으로 판단한다. This study reports a simple sequential micromolding method to produce monodisperse anisotropic microparticles with precisely controllable patchy size and chemistry of compartmentalization. Specifically, our fabrication procedure involves sequential formation of primary and secondary compartments in micromolds via surface tension-induced droplet formation coupled with simple photopolymerization. We demonstrate the capability of sequential micromolding technique by generating Mickey mouse-shaped particles with precisely controllable patchy size and chemistry of compartment and the fabrication method needs no sophisticated control or expensive facilities. The micromolding technique applied in this study can control the size of patchy diameter from 15 to 31 μm by simply adjusting the concentration of photocurable monomer in ethanol. Finally, the Mickey mouse-shaped microparticles with negatively charged patches are confirmed by selective binding of positively charged fluorescence dyes. These results prove a simple, robust, and scalable fabrication of highly monodisperse and complex anisotropic microparticles in a controlled manner based on sequential micromolding.

Highly sensitive hydrogen sensors: Pd-coated Si nanowire arrays for detection of dissolved hydrogen in oil

Jang, Byungjin,Kim, Min Hyung,Baek, Jisun,Kim, Wonkung,Lee, Wooyoung Elsevier 2018 Sensors and actuators. B, Chemical Vol.273 No.-

<P><B>Abstract</B></P> <P>We studied the H<SUB>2</SUB> sensing properties of Pd nanoparticles on vertical standing Si nanowire (NW) arrays for the detection of dissolved hydrogen (H<SUB>2</SUB>) gas in transformer oil. The Pd-coated Si NW arrays were fabricated by using the aqueous electroless etching method and sputtering. The Pd-coated Si NW arrays were immersed and measured in transformer oil with various dissolved concentrations of H<SUB>2</SUB>. We found that Pd-coated Si NW arrays showed significantly superior performance with regard to the response (∼1000%), the lowest detection limit (1 ppm), and the response time (600 s). The Pd-coated Si NW arrays showed a temperature coefficient of resistance (TCR) of 6.53 × 10<SUP>−3</SUP> °C<SUP>-1</SUP> at various oil temperatures (20–80 °C). Pd-coated Si NW arrays showed good reliability for the detection of H<SUB>2</SUB> in oil at room temperature (20 °C), with nearly the same initial resistance for 30 days.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Pd-coated Si NW arrays were fabricated by using an aqueous electroless etching method and sputtering. </LI> <LI> H<SUB>2</SUB> sensing properties of Pd-coated Si NW arrays were measured with various dissolved concentrations in transformer oil. </LI> <LI> The temperature dependence and long term stability of Pd-coated Si NW arrays were monitored to assess the reliability of the sensor. </LI> </UL> </P>

Enhanced hydrogen sensing properties of Pd-coated SnO₂ nanorod arrays in nitrogen and transformer oil

Kim, Min Hyung,Jang, Byungjin,Kim, Wonkyung,Lee, Wooyoung Elsevier Sequoia 2019 Sensors and actuators. B Chemical Vol.283 No.-

<P><B>Abstract</B></P> <P>We report enhanced sensing properties of Pd-coated SnO<SUB>2</SUB> nanorod (NR) arrays for detecting H<SUB>2</SUB> gas in N<SUB>2</SUB> and dissolved in transformer oil. The Pd nanoparticles were coated on randomly ordered vertical SnO<SUB>2</SUB> NR arrays by the glancing angle deposition (GLAD) method, which utilizes an electron-beam evaporator and a DC magnetron sputtering system. The Pd-coated SnO<SUB>2</SUB> NR arrays exhibited high response (104 at 1% H<SUB>2</SUB>) in N<SUB>2</SUB>. Pd-coated SnO<SUB>2</SUB> NR arrays were immersed and in mineral oil that contains various concentrations of dissolved H<SUB>2</SUB> and the electrical response was measured. We found that the Pd-coated SnO<SUB>2</SUB> NR arrays showed superior response (<I>R</I> = ˜96), low detection limit (0.3 ppm), and fast response times (300 s). The Pd-coated SnO<SUB>2</SUB> NR arrays had a temperature coefficient of resistance (TCR) of 3.69 × 10-3 °C<SUP>−1</SUP> at various oil temperatures (20–80 °C), indicating good thermal stability at high temperatures. The sensing mechanism of the Pd-coated SnO<SUB>2</SUB> NR arrays was also demonstrated by using changes in the Schottky barrier height at the Pd/SnO<SUB>2</SUB> interface upon exposure to H<SUB>2</SUB>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Pd-coated SnO<SUB>2</SUB> NR arrays were fabricated by using a GLAD and sputtering. </LI> <LI> High-performance H<SUB>2</SUB> sensing properties were obtained in both air and mineral oil. </LI> <LI> The sensing mechanism was demonstrated by changes in the Schottky barrier height. </LI> </UL> </P>

Nanogap-controlled Pd coating for hydrogen sensitive switches and hydrogen sensors

Shim, Young-Seok,Jang, Byungjin,Suh, Jun Min,Noh, Myoung Sub,Kim, Sangtae,Han, Soo Deok,Song, Young Geun,Kim, Do Hong,Kang, Chong-Yun,Jang, Ho Won,Lee, Wooyoung Elsevier Science B.V., Amsterdam. 2018 Sensors and actuators. B Chemical Vol.255 No.2

High-performance hydrogen sensing properties and sensing mechanism in Pd-coated <i>p-</i>type Si nanowire arrays

Baek, Jisun,Jang, Byungjin,Kim, Min Hyung,Kim, Wonkung,Kim, Jeongmin,Rim, Hyun Jun,Shin, Sera,Lee, Taeyoon,Cho, Sungmee,Lee, Wooyoung Elsevier 2018 Sensors and actuators. B Chemical Vol.256 No.-

<P><B>Abstract</B></P> <P>We report on the H<SUB>2</SUB> sensing performance and sensing mechanism in Pd-coated <I>n-</I> and <I>p-</I>type Si nanowire (NW) arrays, which were fabricated by an aqueous electroless etching method and sputtering. We found that the resistance of the Pd-coated <I>n</I>-type Si NWs decreased from the base resistance, whereas that of the <I>p-</I>type Si NW arrays increased, upon exposure to H<SUB>2</SUB>. The sensitivity (<I>S</I> =1700% at 1% H<SUB>2</SUB>) of Pd-coated <I>p-</I>type NW arrays was much greater than that of the <I>n-</I>type NW arrays (<I>S</I> =75%). Furthermore, we found that the dependency of the change in carrier density on H<SUB>2</SUB> concentration was significantly greater in <I>p</I>-type Si NW arrays, while it was negligible in the <I>n-</I>type NW arrays. A Schottky barrier was formed between the Pd and <I>n-</I>Si (ϕ<SUB>M</SUB> >ϕ<SUB>SC</SUB>) before exposure to H<SUB>2</SUB>, which changed to an Ohmic contact (ϕ<SUB>M</SUB> <ϕ<SUB>SC</SUB>) after H<SUB>2</SUB> exposure. In contrast, an Ohmic contact was formed between the Pd and <I>p-</I>Si (ϕ<SUB>M</SUB> >ϕ<SUB>SC</SUB>) before exposure to H<SUB>2</SUB>, which, after exposure, changed to a Schottky barrier (ϕ<SUB>M</SUB> <ϕ<SUB>SC</SUB>). Therefore, the <I>p-</I>type Si NW arrays were much more sensitive to H<SUB>2</SUB> than the <I>n-</I>type Si NW arrays.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The H<SUB>2</SUB> sensing performance and sensing mechanism in Pd-coated <I>n-</I> and <I>p-</I>type Si NW arrays was demonstrated. </LI> <LI> The resistance of the Pd-coated <I>n</I>-type Si NWs decreased from the base resistance, whereas that of the <I>p-</I>type Si NW arrays increased, upon exposure to H<SUB>2</SUB>. </LI> <LI> The sensitivity (<I>S</I> =1700% at 1% H<SUB>2</SUB>) of Pd-coated <I>p-</I>type NW arrays was much greater than that of the <I>n-</I>type NW arrays (<I>S</I> =75%). </LI> <LI> The dependency of the change in carrier density on H<SUB>2</SUB> concentration was significantly greater in <I>p</I>-type Si NW arrays, while it was negligible in the <I>n-</I>type NW arrays. </LI> </UL> </P>

Facile fabrication of ZnO nanowire memory device based on chemically-treated surface defects

Park, Woojin,Kim, Tae Hyeon,Nam, Jae Hyeon,Jang, Hye Yeon,Pak, Yusin,Min, Jung-Wook,Yun, Joho,Cho, Byungjin IOP 2019 Nanotechnology Vol.30 No.15

<P>In this study, we demonstrate a transistor-type ZnO nanowire (NW) memory device based on the surface defect states of a rough ZnO NW, which is obtained by introducing facile H<SUB>2</SUB>O<SUB>2</SUB> solution treatment. The surface defect states of the ZnO NW are validated by photoluminescence characterisation. A memory device based on the rough ZnO NW exhibits clearly separated bi-stable states (ON and OFF states). A significant current fluctuation does not exist during repetitive endurance cycling test. Stable memory retention characteristics are also achieved at a high temperature of 85 °C and at room temperature. The surface-treated ZnO NW device also exhibits dynamically well-responsive pulse switching under a sequential pulse test configuration, thereby indicating its potential practical memory applications. The simple chemical treatment strategy can be widely used for modulating the surface states of diverse low-dimensional materials.</P>